WO2015003077A1 - Heat activated shrink films - Google Patents

Heat activated shrink films Download PDF

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Publication number
WO2015003077A1
WO2015003077A1 PCT/US2014/045288 US2014045288W WO2015003077A1 WO 2015003077 A1 WO2015003077 A1 WO 2015003077A1 US 2014045288 W US2014045288 W US 2014045288W WO 2015003077 A1 WO2015003077 A1 WO 2015003077A1
Authority
WO
WIPO (PCT)
Prior art keywords
film
glass transition
polymer
transition temperature
shrinkable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2014/045288
Other languages
French (fr)
Inventor
Hoang T. Pham
Anle XUE
Yatin PATIL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Avery Dennison Corp
Original Assignee
Avery Dennison Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Avery Dennison Corp filed Critical Avery Dennison Corp
Priority to CN201480048313.2A priority Critical patent/CN105492328B/en
Priority to EP14742434.5A priority patent/EP3016865B1/en
Priority to AU2014284262A priority patent/AU2014284262A1/en
Priority to CA2917301A priority patent/CA2917301C/en
Publication of WO2015003077A1 publication Critical patent/WO2015003077A1/en
Anticipated expiration legal-status Critical
Priority to AU2018203060A priority patent/AU2018203060C1/en
Priority to AU2019202531A priority patent/AU2019202531B2/en
Priority to AU2020203916A priority patent/AU2020203916A1/en
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/003—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/325—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polycycloolefins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing four or more carbon atoms
    • C08L23/0823—Copolymers of ethene with unsaturated hydrocarbons only containing four or more carbon atoms with aliphatic cyclic olefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2009/00—Use of rubber derived from conjugated dienes, as moulding material
    • B29K2009/06—SB polymers, i.e. butadiene-styrene polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/0625—LLDPE, i.e. linear low density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/0633—LDPE, i.e. low density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/38—Polymers of cycloalkenes, e.g. norbornene or cyclopentene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B29K2067/003—PET, i.e. poylethylene terephthalate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0088—Blends of polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/02—Condition, form or state of moulded material or of the material to be shaped heat shrinkable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0049—Heat shrinkable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/704—Crystalline
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/734—Dimensional stability
    • B32B2307/736—Shrinkable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2519/00—Labels, badges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/066—LDPE (radical process)
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • Y10T428/2495—Thickness [relative or absolute]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers

Definitions

  • Shrink films have numerous uses, including as product labels and for packaging.
  • the present invention further provides embodiments of shrink films and also methods for preparing shrink films.
  • the invention includes a shrink film with at least a first shrinkable film layer.
  • the shrinkable film layer includes a blend of a shrinkable polymer having a high glass transition temperature, and a shrinkable polymer having a low glass transition temperature.
  • the present invention includes a method for preparing a shrinkable film.
  • the method includes preparing a blend comprising a shrinkable polymer having a high glass transition temperature and a shrinkable polymer having a low glass transition temperature, and forming a film from the blend.
  • Fig. 1 is a graph of oven shrink values of exemplary films.
  • Fig. 2 is a graph of DMA shrink curves of exemplary films.
  • shrink films are films that shrink in at least one direction when heated to a shrink initiation temperature.
  • shrink films of the present invention may shrink only in the machine direction upon exposure to a shrink initiation temperature.
  • shrink films may alternatively or additionally shrink in the transverse direction (also called the cross direction) upon exposure to a shrink initiation temperature.
  • shrink films of the present invention may shrink only in the machine direction upon exposure to a shrink initiation temperature and may also grow (or expand) in the cross direction.
  • the present invention includes films comprised of at least one shrinkable layer prepared using a blend of (i) at least one shrinkable polymer having a high glass transition temperature (Tg), and (ii) at least one shrinkable polymer having a low Tg.
  • films of the present invention may have at least one film layer prepared using (i) at least one cyclic olefin copolymer (COC) having a high glass transition temperature, and (ii) at least one COC having a low glass transition temperature.
  • COC cyclic olefin copolymer
  • high Tg indicates a glass transition in the range of about 85° C to about 165° C
  • low Tg indicates a glass transition temperature lower than about 85° C.
  • the foregoing ranges shall include each intermittent value and each intermittent range therein.
  • polymers having high Tg may include polymers having a Tg in the range of about 85° C to about 160° C.
  • polymers having a Tg of about 90° C to about 155° C may be used as a high Tg polymer.
  • polymers having a Tg from about -100° C to about 85° C may be used as a low Tg polymer.
  • polymers having a Tg from about -60° C to about 85° C may be used as a low Tg polymer.
  • polymers having a Tg in the range of about -40° C to 83° C may be used as a low Tg polymer.
  • polymers having a Tg in the range of about -35° C to about 82° C may be used as a low Tg polymer.
  • polymers having a Tg of less than about 80° C may be used as a low Tg polymer.
  • Each of the foregoing ranges shall include each intermittent value and each intermittent range therein. [0011] Any suitable blend of high and low Tg polymers may be used in particular embodiments of the present invention.
  • a shrinkable layer may include about 1% to about 99% by weight of shrinkable polymers having a high glass transition temperature and about 1% to about 99% by weight shrinkable polymers having a low glass transition temperature, including each intermittent range therein for each. In some embodiments, a shrinkable layer may include about 10% to about 80% by weight of shrinkable polymers having a high glass transition temperature and about 20% to about 90% by weight shrinkable polymers having a low glass transition temperature
  • one or more high Tg COC polymers and one or more low Tg COC polymers may be blended in a shrinkable layer.
  • a high Tg COC may be blended with a low Tg polyolefin to form a shrinkable layer.
  • polystyrene which has a high Tg
  • a styrene block copolymer having a low Tg such as styrene ethylene butylene styrene polymers (SEBS), styrene ethylene/propylene styrene (SEPS) polymers, styrene butadiene (SBR), styrene- ethylene/propylene-styrene (SEPS), and poly(styrene-butadiene-styrene) polymers (SBS), to form a shrinkable layer.
  • SEBS styrene ethylene butylene styrene polymers
  • SEPS styrene ethylene/propylene styrene
  • SBR styrene butadiene
  • SEPS poly(styrene-butadiene-styrene) polymers
  • a shrinkable layer may include a high Tg polyethylene terephthalate glycol-modified (PETG) and/or polycarbonate blended with a low Tg PETG and/or low Tg polyethylene terephthalate (PET).
  • PETG polyethylene terephthalate glycol-modified
  • PET polyethylene terephthalate
  • shrinkable layer polymer blend is alternatively based upon heat deflection temperatures (also called the heat distortion temperatures) (HDT).
  • shrinkable layers may comprise a blend of (i) at least one polymer, such as a COC, having a high heat deflection temperature, and (ii) at least one polymer, such as a COC, having a low heat deflection temperature.
  • a high heat deflection temperature includes temperatures above about 75° C
  • low heat deflection temperature includes temperatures at about or below about 75° C.
  • Shrinkable layers of the present invention having a blend of a high Tg polymer and a low Tg polymer may optionally include other components.
  • the shrinkable layer may include one or more additional polymer materials, such as linear low density polyethylene or low density polyethylene.
  • additional polymer materials such as linear low density polyethylene or low density polyethylene.
  • such layers may also contain other components such as pigments, fillers, stabilizers, light protective agents or other suitable modifying agents if desired.
  • These film layers may also contain anti-block, slip additives and anti-static agents.
  • Useful anti-block agents include inorganic particles, such as clays, talc, calcium carbonate and glass.
  • Slip additives useful in the present invention include polysiloxanes, waxes, fatty amides, fatty acids, metal soaps and particulate such as silica, synthetic amorphous silica and polytetrafluoroethylene powder.
  • Antistatic agents useful in the present invention include alkali metal sulfonates, polyether-modified polydiorganosiloxanes, polyalkylphenylsiloxanes and tertiary amines.
  • shrinkable layers of the present invention may include from about 5% to about 50% by weight of a semi-crystalline polymer.
  • semi-crystalline polymers may include olefinic polymers, such as linear low density polyethylene, low density polyethylene, and other polyethylenes.
  • the shrinkable layer may include one or more semi-crystalline polymers having a density in the range of about 0.90 g/cc to about 0.94 g/cc.
  • shrinkable layers having a blend of high and low Tg COC polymers may include semi-crystalline polymers having a density in the range of about 0.905 g/cc to about 0.935 g/cc. In still other embodiments, shrinkable layers having a blend of high and low Tg COC polymers may include semi-crystalline polymers having a density in the range of about 0.91 g/cc to about 0.93 g/cc.
  • Films of the present invention may be single layer films having a blend of high and low Tg polymers or, in other embodiments, may be multilayer films wherein at least one layer is prepared using a blend of high and low Tg polymers.
  • shrinkable layers having at least one high Tg polymer and one low Tg polymer may constitute at least about 5% of the total thickness of a multilayer film.
  • shrinkable layers having a blend of at least one high Tg polymer and one low Tg polymer may constitute about 2% to about 30% of the total thickness of a multilayer film.
  • such high Tg and low Tg blend shrinkable layers may constitute about 5% to about 25% of the total thickness of a multilayer film.
  • a multilayer film may have a first shrink layer that includes a high and low Tg blend and at least a second shrink layer that does not include a high and low Tg blend.
  • a core may include a polymeric material, such as a polyolefin resin or blends thereof.
  • the core layer in some embodiments of the present invention may be comprised of low density polyethylene, linear low density polyethylene, medium density polyethylene, ethyl vinyl acetate, polypropylene, and blends thereof.
  • the core layer may additionally or alternatively be comprised of elastomers and/or plastomers.
  • the core layer may also be prepared with other non-olefinic material, such as styrene ethylene butylene styrene (SEBS), poly(styrene-butadiene-styrene) (SBS), poly(styrene-isoprene-styrene) (SIS), and other similar comopnents.
  • SEBS styrene ethylene butylene styrene
  • SBS poly(styrene-butadiene-styrene)
  • SIS poly(styrene-isoprene-styrene)
  • Samples A-E are films having a shrinkable layer with a high Tg COC (indicated as TOPAS 5013) and a low Tg COC (indicated as TOPAS 8007), and the weight ratio of high Tg COC to low Tg COC is varied for each sample.
  • Samples F-H show exemplary compositions for embodiments of a film skin layer wherein a tie layer includes a blend of high Tg COC and low Tg COC. In similar fashion, the weight ratio of high Tg polymer to low Tg polymer in the tie layer is varied between these samples.
  • Samples l-J use a high Tg polystyrene (indicated as Polystyrene EA3400 and having a Tg of about 102 °C) and low Tg styrene ethylene butylene styrene polymers (SEBS) (indicated as Kraton G2832 and having a Tg of -42 °C).
  • SEBS Tg styrene ethylene butylene styrene polymers
  • Sample K employs a high Tg PETG (indicated as FXlOO, which is available from Eastman as Tritan Copolyester FXlOO and has a Tg of 110 °C) and Sample L employs FXlOO and a low Tg PETG (indicated as SKC, which is available from SK Chemicals as Skygreen K2012 and has a Tg of 82 °C).
  • FXlOO high Tg PETG
  • SKC which is available from SK Chemicals as Skygreen K2012 and has a Tg of 82 °C
  • Topas COC 800 7 Topas COC 800 7: Topas COC 800 7: Topas COC 800 7: Topas COC 800 7: Topas COC 8007: Topas COC 8007: Topas COC 5013: Topas COC 5013: Topas COC 5013: Topas COC 501.3: Topas COC 5013:
  • Topas COC 8007 Topas COC 8007 : Topas COC 800 ': American Styrer lies American Styrenics Dow Elite 6111: Dow Elite 6111: Dow Elite 6111: Polystyrene EA3400: Polystyrene EA3400:
  • Topas COC 8007 Topas COC 8007 : Topas COC 800
  • Blend Ratio 8007:5013 60:4 0) 8007:5013 (50:5 0) 8007:5013 (40:( JO) NA NA layer % 45-85% 45-85% 45-85% 55-70% 55-70%
  • PE1017:Dowlex PE1017:Dowlex (C) Composition Versify 2300 (10 0) Versify 2300 (10 0) Versify 2300 (1C
  • Composition FX-100 (100%)
  • the low Tg polymer was Topas COC
  • the antiblock referenced is available under the brand name Crystal Clear 102077 Antiblock Additive PE M B, which is available from Ampacet Corporation.
  • the high Tg material was PETG (indicated as FX100, which is available from Eastman as Tritan Copolyester FX100 and has a Tg of 110 °C) and, for Sample L employs FX100 and a low Tg PETG (indicated as SKC, which is available from SK Chemicals as Skygreen K2012 and has a Tg of 82 °C).
  • FX100 which is available from Eastman as Tritan Copolyester FX100 and has a Tg of 110 °C
  • SKC which is available from SK Chemicals as Skygreen K2012 and has a Tg of 82 °C.
  • polystyrene was the high Tg polymer, and
  • EA3400 indicates a polystyrene product available from American Styrenics, LLC, and SEBS was the low Tg polymer, wherein G2832 indicates a Kraton G2832 is a styrene-ethylene/butylenes- styrene (SEBS) block copolymer available from Kraton Polymers.
  • SEBS styrene-ethylene/butylenes- styrene
  • LDPE indicates low density polyethylene, specifically Dowlex LDPE 722 available from The Dow Chemical Company, Septon 2004 indicates a styrene ethylene propylene styrene block copolymer available under the brand name Septon 2004 from Kuraray CO., Ltd.
  • Amplify 3351 indicates a maleic anhydride grafted polymer available under the brand name Amplify 3351 from The Dow Chemical Company
  • Huntsman LDPE PE1017 indicates low density polyethylene under the brand name PE1017 available from Huntsman Corporation
  • Dowlex LDPE 722 indicates a low density polyethylene available under the brand name Dowlex LDPE 722 from The Dow Chemical Company
  • Engage 8842 indicates a polyolefin elastomer available from the Dow Chemical Company.
  • Samples A-L were also tested for MD oven shrinkage, DMA shrink curve and for various optical properties.
  • the MD oven shrinkage was tested by punching 4" by 4" film portions for the samples. For each sample, a different portion was placed in an oven that was one of the temperatures listed in the data below. The portion was heated for five minutes and then measured to determine the dimensional change (shrinkage or growth) in each direction. The reported values below are the percentage shrink in the machine direction from the original portion.
  • the DMA shrink testing was conducted for each sample by placing a strip of the sample in a rheometer and applying a small load to strip in the tension direction to avoid curling. Heat was then applied at a rate of 3° C/ min.
  • the strip was be monitored and the data below, which provides the change in dimension as a function of temperature, were recorded.
  • the optical properties were tested using the following procedures. For gloss, specular gloss of plastic films was measured at 60° pursuant to Standard ASTM D2457. Transmittance, haze, and clarity were determined by measuring the resultant light passed through the plastic film from a light source pursuant to Standard ASTM D2457.
  • the shrinkage properties of a film may be varied based upon the ratio of high Tg polymer to low Tg polymer.
  • the initiation shrink temperature is a non-linear function of high Tg polymer to low Tg polymer.
  • this shrink initiation temperature may be adjusted in particular embodiments by varying the ratio of high Tg polymer to low Tg polymer in the shrinkable layer.
  • the shrink initiation temperature may be controlled for a film by the ratio of high Tg polymer to low Tg polymer in the shrinkable film layer. For example, through the blending of such components in a film layer, the shrink initiation temperature may be adjusted to a desirable level. As a result, using extrapolations from testing various film layers having different ratios of high Tg polymers to low Tg polymers, the data may be extrapolated to determine the necessary ratio to achieve a certain shrink initiation temperature for a film. Such embodiments of the present invention allow a film to be prepared with a suitable shrink initiation temperature, which may avoid the film undesirably shrinking at normal storage or transportation temperatures.

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Abstract

Shrinkable film layers having a blend of (i) one or more polymers with a high glass transition temperature, and (ii) one or more polymers with a low glass transition temperature are disclosed. Methods for preparing such film layers are also disclosed.

Description

HEAT ACTIVATED SHRINK FILMS
BACKGROUND OF THE INVENTION
[0001] Shrink films have numerous uses, including as product labels and for packaging. The present invention further provides embodiments of shrink films and also methods for preparing shrink films.
SUMMARY OF THE INVENTION
[0002] In one embodiment, the invention includes a shrink film with at least a first shrinkable film layer. The shrinkable film layer includes a blend of a shrinkable polymer having a high glass transition temperature, and a shrinkable polymer having a low glass transition temperature.
[0003] In another embodiment, the present invention includes a method for preparing a shrinkable film. The method includes preparing a blend comprising a shrinkable polymer having a high glass transition temperature and a shrinkable polymer having a low glass transition temperature, and forming a film from the blend.
[0004] The following description illustrates one or more embodiments of the invention and serves to explain the principles and exemplary embodiment of the invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0005] Fig. 1 is a graph of oven shrink values of exemplary films; and
[0006] Fig. 2 is a graph of DMA shrink curves of exemplary films.
DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS
[0007] Reference will now be made in detail to exemplary embodiments of the present invention, one or more examples of which are illustrated in the accompanying drawings. Each example is provided by way of explanation of the invention and not by limitation of the invention. It will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment may be used on another embodiment to yield a still further embodiment. Thus, it is intended that the present invention covers such modifications and variations as come within the scope of the appended claims and their equivalents.
[0008] As is understood in the art, shrink films are films that shrink in at least one direction when heated to a shrink initiation temperature. I n some embodiments, shrink films of the present invention may shrink only in the machine direction upon exposure to a shrink initiation temperature. I n other embodiments, shrink films may alternatively or additionally shrink in the transverse direction (also called the cross direction) upon exposure to a shrink initiation temperature. In still other embodiments, shrink films of the present invention may shrink only in the machine direction upon exposure to a shrink initiation temperature and may also grow (or expand) in the cross direction. [0009] In some embodiments, the present invention includes films comprised of at least one shrinkable layer prepared using a blend of (i) at least one shrinkable polymer having a high glass transition temperature (Tg), and (ii) at least one shrinkable polymer having a low Tg. In some specific embodiments, films of the present invention may have at least one film layer prepared using (i) at least one cyclic olefin copolymer (COC) having a high glass transition temperature, and (ii) at least one COC having a low glass transition temperature. As used herein, high Tg indicates a glass transition in the range of about 85° C to about 165° C and low Tg indicates a glass transition temperature lower than about 85° C. The foregoing ranges shall include each intermittent value and each intermittent range therein.
[0010] Any combination of one or more shrinkable polymers having a high Tg and one or more shrinkable polymers having a low Tg are within the scope of the present invention. In some particular embodiments, polymers having high Tg may include polymers having a Tg in the range of about 85° C to about 160° C. In other embodiments, polymers having a Tg of about 90° C to about 155° C may be used as a high Tg polymer. In addition, in some particular embodiments, polymers having a Tg from about -100° C to about 85° C may be used as a low Tg polymer. In some embodiments, polymers having a Tg from about -60° C to about 85° C may be used as a low Tg polymer. In yet other embodiments, polymers having a Tg in the range of about -40° C to 83° C may be used as a low Tg polymer. In still other embodiments, polymers having a Tg in the range of about -35° C to about 82° C may be used as a low Tg polymer. In yet other embodiments, polymers having a Tg of less than about 80° C may be used as a low Tg polymer. Each of the foregoing ranges shall include each intermittent value and each intermittent range therein. [0011] Any suitable blend of high and low Tg polymers may be used in particular embodiments of the present invention. In some embodiments, a shrinkable layer may include about 1% to about 99% by weight of shrinkable polymers having a high glass transition temperature and about 1% to about 99% by weight shrinkable polymers having a low glass transition temperature, including each intermittent range therein for each. In some embodiments, a shrinkable layer may include about 10% to about 80% by weight of shrinkable polymers having a high glass transition temperature and about 20% to about 90% by weight shrinkable polymers having a low glass transition temperature
[0012] By way of example, in some embodiments, one or more high Tg COC polymers and one or more low Tg COC polymers may be blended in a shrinkable layer. In other embodiments, a high Tg COC may be blended with a low Tg polyolefin to form a shrinkable layer. In still other embodiments, polystyrene, which has a high Tg, may be blended with a styrene block copolymer having a low Tg, such as styrene ethylene butylene styrene polymers (SEBS), styrene ethylene/propylene styrene (SEPS) polymers, styrene butadiene (SBR), styrene- ethylene/propylene-styrene (SEPS), and poly(styrene-butadiene-styrene) polymers (SBS), to form a shrinkable layer. Additionally, in some embodiments, a shrinkable layer may include a high Tg polyethylene terephthalate glycol-modified (PETG) and/or polycarbonate blended with a low Tg PETG and/or low Tg polyethylene terephthalate (PET). The foregoing embodiments are intended to be illustrative of specific embodiments of the present invention without limiting its full scope.
[0013] In addition, although embodiments herein are discussed in the context of glass transition temperatures, the present invention also includes embodiments wherein the shrinkable layer polymer blend is alternatively based upon heat deflection temperatures (also called the heat distortion temperatures) (HDT). In this regard, such shrinkable layers may comprise a blend of (i) at least one polymer, such as a COC, having a high heat deflection temperature, and (ii) at least one polymer, such as a COC, having a low heat deflection temperature. As used herein, a high heat deflection temperature includes temperatures above about 75° C, and low heat deflection temperature includes temperatures at about or below about 75° C.
[0014] Shrinkable layers of the present invention having a blend of a high Tg polymer and a low Tg polymer may optionally include other components. By way of example, in some embodiments, the shrinkable layer may include one or more additional polymer materials, such as linear low density polyethylene or low density polyethylene. In addition, such layers may also contain other components such as pigments, fillers, stabilizers, light protective agents or other suitable modifying agents if desired. These film layers may also contain anti-block, slip additives and anti-static agents. Useful anti-block agents include inorganic particles, such as clays, talc, calcium carbonate and glass. Slip additives useful in the present invention include polysiloxanes, waxes, fatty amides, fatty acids, metal soaps and particulate such as silica, synthetic amorphous silica and polytetrafluoroethylene powder. Antistatic agents useful in the present invention include alkali metal sulfonates, polyether-modified polydiorganosiloxanes, polyalkylphenylsiloxanes and tertiary amines.
[0015] In some embodiments, shrinkable layers of the present invention may include from about 5% to about 50% by weight of a semi-crystalline polymer. By way of example, such semi-crystalline polymers may include olefinic polymers, such as linear low density polyethylene, low density polyethylene, and other polyethylenes. In some embodiments having a shrinkable layer with a blend of high and low Tg COC polymers, the shrinkable layer may include one or more semi-crystalline polymers having a density in the range of about 0.90 g/cc to about 0.94 g/cc. In other embodiments, shrinkable layers having a blend of high and low Tg COC polymers may include semi-crystalline polymers having a density in the range of about 0.905 g/cc to about 0.935 g/cc. In still other embodiments, shrinkable layers having a blend of high and low Tg COC polymers may include semi-crystalline polymers having a density in the range of about 0.91 g/cc to about 0.93 g/cc.
[0016] Films of the present invention may be single layer films having a blend of high and low Tg polymers or, in other embodiments, may be multilayer films wherein at least one layer is prepared using a blend of high and low Tg polymers. In some embodiments, shrinkable layers having at least one high Tg polymer and one low Tg polymer may constitute at least about 5% of the total thickness of a multilayer film. In some embodiments, shrinkable layers having a blend of at least one high Tg polymer and one low Tg polymer may constitute about 2% to about 30% of the total thickness of a multilayer film. In other embodiments, such high Tg and low Tg blend shrinkable layers may constitute about 5% to about 25% of the total thickness of a multilayer film. In addition, in some embodiments, such as in Samples F-H discussed below, a multilayer film may have a first shrink layer that includes a high and low Tg blend and at least a second shrink layer that does not include a high and low Tg blend.
[0017] In some multilayer film embodiments of the present invention, other layers may include, by way of example, skin layers, tie layers, core layers, print layers, and adhesive layers. In some embodiments, a core may include a polymeric material, such as a polyolefin resin or blends thereof. For example, the core layer in some embodiments of the present invention may be comprised of low density polyethylene, linear low density polyethylene, medium density polyethylene, ethyl vinyl acetate, polypropylene, and blends thereof. In some embodiments, the core layer may additionally or alternatively be comprised of elastomers and/or plastomers. In some embodiments, the core layer may also be prepared with other non-olefinic material, such as styrene ethylene butylene styrene (SEBS), poly(styrene-butadiene-styrene) (SBS), poly(styrene-isoprene-styrene) (SIS), and other similar comopnents.
[0018] The following samples provide certain exemplary embodiments in accordance with some aspects of the present invention. As shown below for Samples A-E are films having a shrinkable layer with a high Tg COC (indicated as TOPAS 5013) and a low Tg COC (indicated as TOPAS 8007), and the weight ratio of high Tg COC to low Tg COC is varied for each sample. In addition, Samples F-H show exemplary compositions for embodiments of a film skin layer wherein a tie layer includes a blend of high Tg COC and low Tg COC. In similar fashion, the weight ratio of high Tg polymer to low Tg polymer in the tie layer is varied between these samples. Samples l-J use a high Tg polystyrene (indicated as Polystyrene EA3400 and having a Tg of about 102 °C) and low Tg styrene ethylene butylene styrene polymers (SEBS) (indicated as Kraton G2832 and having a Tg of -42 °C). Finally, Sample K employs a high Tg PETG (indicated as FXlOO, which is available from Eastman as Tritan Copolyester FXlOO and has a Tg of 110 °C) and Sample L employs FXlOO and a low Tg PETG (indicated as SKC, which is available from SK Chemicals as Skygreen K2012 and has a Tg of 82 °C). As reflected in the data below, the layer percentage is a volumetric percentage reflecting the thickness ratio of the layer. TABLE 1 Sample A Sample B Sample C Sample D Sample E
Layers 3 Layers [A-C-A ] 3 Layers [A-C-A ] 3 Layers [A-C-A ] 3 Layers [A-C-A ] 3 Layers [A-C-A ]
layer % 20-35% 20-35% 20-35% 20-35% 20-1 35%
Topas COC 800 7: Topas COC 800 7: Topas COC 800 7: Topas COC 800 7: Topas COC 8007: Topas COC 5013: Topas COC 5013: Topas COC 5013: Topas COC 501.3: Topas COC 5013:
Skin Layer (A) Composition
Dowlex LDPE 722 Dowlex LDPE 722 Dowlex LDPE 722 Dowlex LDPE 7.12 Dowlex LDPE 722 (85 : 0 : 15) (68 : 17 : 15) (51 : 34 : 15) (42.5 : 42.5 : 15 ) (34 : 51 : 15)
COC Ratio 8007:5013 (10( ):0) 8007:5013 (80: 20) 8007:5013 (60: 40) 8007:5013 (50: 50) 8007:5013 (40:60) layer % 65-807,, 65-80% 65-80%. 65-5 30% 65-5 30%
Core Layer (C)
Composition Versify 2300 (1 00) Versify 2300 (1 00) Versify 2300 (1 00) Versify 2300 (1( DO) Versify 2300 (100)
Sample F Sample G Sample H Sample 1 Sample J
Layers 5 Layers [A-B-C-l 3-A ] 5 Layers [A-B-C- B-A ] 5 Layers [A-B-C- B-A ] 5 Layers [A-B-C- B-A ] 5 Layers [A-B-C-B-A ]
layer % 5-20 /-.. 5-20% 5-20% 20-35% 20-: 55%
Topas COC 8007 : Topas COC 8007 : Topas COC 800 ': American Styrer lies American Styrenics Dow Elite 6111: Dow Elite 6111: Dow Elite 6111: Polystyrene EA3400: Polystyrene EA3400:
Skin Layer (A) Composition
Ampacet Antiblc ck Ampacet Antiblc )ck Ampacet Antibl Dck Kraton G2832 (£ )3:7) Kraton G2832 (93:7) (84 : 15 : 1) (84 : 15 : 1) (84 : 15 : 1)
COC Ratio NA NA NA NA NA layer % 10-25% 10-25% 10-25% 10-2 0% 10-; !0%
Topas COC 8007 : Topas COC 8007 : Topas COC 800
Dowlex LDPE 722: Topas COC 5013 : Topas COC 5013 : Topas COC 501Ξ
Tie Layer (B) Composition Septon 2004 Amplify 3351
Dow Elite 6111 Dow Elite 6111 Dow Elite 6111
(10:90)
(51 : 34 : 15) (42.5 : 42.5 : 15] (34 : 51 : 15)
Blend Ratio 8007:5013 (60:4 0) 8007:5013 (50:5 0) 8007:5013 (40:( JO) NA NA layer % 45-85% 45-85% 45-85% 55-70% 55-70%
Huntsman LDPE Huntsman LDPE
Core Layer
PE1017:Dowlex PE1017:Dowlex (C) Composition Versify 2300 (10 0) Versify 2300 (10 0) Versify 2300 (1C
' LDPE 722: Engaj >e LDPE 722: Engage 8842 (40:50:10) 8842 (40:50: 10)
TABLE 1 Sample K Sample L
Layers 3 Layers [A-C-A ] 3 Layers [A-C-A ]
layer % ■lU-i /.
FX 100 (99%) FX 100 (49.5%):
Eastman Antiblock SKC (49.5%):
Skin Layer (A) Composition
in PETG (1%) Eastman Antiblock
in PETG (1%)
PETG Ratio FX 100 (100:0) FX 100:SKC (50:50)
layer % 65-80% 65-80
Core Layer (C) FX-100 (50%)
Composition FX-100 (100%)
SK PETG (50%)
[0019] As used in certain examples in Table I, the low Tg polymer was Topas COC
8007 (which has a HDT/B of 75° C) and the high Tg polymer was Topas COC 5013 (which has a HDT/B of 130° C), wherein both are available from Topas Advanced Polymers, Inc. In addition, low density polyethylene products used are referenced as Dowlex LDPE (which has a density of 0.918 g/cm3) and Dow Elite 6111 (which has a density of 0.912 g/cm3 and is an enhanced polyethylene resin with an ethylene-octene copolymer), both of which are available from the Dow Chemical Company. Furthermore, Versify 2300 is an elastomer having a density of 0.867 g/cm3 and also is available from The Dow Chemical Company. The antiblock referenced is available under the brand name Crystal Clear 102077 Antiblock Additive PE M B, which is available from Ampacet Corporation. With regard to Sample K and L, as noted above, the high Tg material was PETG (indicated as FX100, which is available from Eastman as Tritan Copolyester FX100 and has a Tg of 110 °C) and, for Sample L employs FX100 and a low Tg PETG (indicated as SKC, which is available from SK Chemicals as Skygreen K2012 and has a Tg of 82 °C). [0020] In other examples in Table I, polystyrene was the high Tg polymer, and
EA3400 indicates a polystyrene product available from American Styrenics, LLC, and SEBS was the low Tg polymer, wherein G2832 indicates a Kraton G2832 is a styrene-ethylene/butylenes- styrene (SEBS) block copolymer available from Kraton Polymers. In addition, LDPE indicates low density polyethylene, specifically Dowlex LDPE 722 available from The Dow Chemical Company, Septon 2004 indicates a styrene ethylene propylene styrene block copolymer available under the brand name Septon 2004 from Kuraray CO., Ltd., Amplify 3351 indicates a maleic anhydride grafted polymer available under the brand name Amplify 3351 from The Dow Chemical Company, Huntsman LDPE PE1017 indicates low density polyethylene under the brand name PE1017 available from Huntsman Corporation, Dowlex LDPE 722 indicates a low density polyethylene available under the brand name Dowlex LDPE 722 from The Dow Chemical Company, and Engage 8842 indicates a polyolefin elastomer available from the Dow Chemical Company. One of ordinary skill in the art readily appreciates that the foregoing specific references to compounds in Table I are exemplary in nature only and that other components with suitable properties may be used in addition to or instead of these components.
[0021] Samples A-L were also tested for MD oven shrinkage, DMA shrink curve and for various optical properties. The MD oven shrinkage was tested by punching 4" by 4" film portions for the samples. For each sample, a different portion was placed in an oven that was one of the temperatures listed in the data below. The portion was heated for five minutes and then measured to determine the dimensional change (shrinkage or growth) in each direction. The reported values below are the percentage shrink in the machine direction from the original portion. The DMA shrink testing was conducted for each sample by placing a strip of the sample in a rheometer and applying a small load to strip in the tension direction to avoid curling. Heat was then applied at a rate of 3° C/ min. The strip was be monitored and the data below, which provides the change in dimension as a function of temperature, were recorded. The optical properties were tested using the following procedures. For gloss, specular gloss of plastic films was measured at 60° pursuant to Standard ASTM D2457. Transmittance, haze, and clarity were determined by measuring the resultant light passed through the plastic film from a light source pursuant to Standard ASTM D2457.
[0022] Although the samples above indicate layer percentage ranges, the actual testing was conducted on films have the following layer percentages: Samples A - E
Skin layer 25% total (12.5% on each side)
Core layer 75% total
Samples F - H
Skin layer 10% total (5% on each side)
Tie layer 20% total (10% each side)
Core layer 70% total
Samples I - J
Skin layer 25% total (12.5% on each side)
Tie layer 14% total (7% each side)
Core layer 61% total
Samples K - L
Skin layer 25% total (12.5% on each side)
Core layer 75% total
Figure imgf000013_0001
Sample K Sample L
MD Oven Shrinkage
@ 5 min
70° C 0 0
80° C 0.5 0.5
90° C 1 2.8
100° C 6.8 17.8
110° C 48 50
125° C - -
140° C 54 57
DMA Shrink curve @
3C/min
Shrink Onset
temperature Temp 78° C 74° C
@ 2% Shrink
Temp @ 5% Shrink 110° C 105° C
Temp @ 35%
118° C 116° C
Shrink
Optical
Properties
Transmittance Not Tested Not Tested
Haze (%) Not Tested Not Tested
Clarity (%) Not Tested Not Tested
MD Gloss @ 60 Not Tested Not Tested
Degrees (GU)
CD Gloss @ 60 Not Tested Not Tested
Degrees (GU)
[0023] As indicated in the results above, the shrinkage properties of a film may be varied based upon the ratio of high Tg polymer to low Tg polymer. Furthermore, as shown in Fig. 1, the initiation shrink temperature is a non-linear function of high Tg polymer to low Tg polymer. As such, this shrink initiation temperature may be adjusted in particular embodiments by varying the ratio of high Tg polymer to low Tg polymer in the shrinkable layer. In general, as shown in the figures, it was generally observed that an increase in the high Tg component yielded an increase in the shrink initiation temperature. In addition, as shown by the comparison of Sample K and Sample L, the blended skin layer in Sample L of high Tg PETG and low Tg PETG (in this case, a low Tg of about 82 °C) resulted in shifting the activation temperature of the film as compared with the high Tg PETG layer of Sample K.
[0024] Appreciating this correlation, in some embodiments of the present invention, the shrink initiation temperature may be controlled for a film by the ratio of high Tg polymer to low Tg polymer in the shrinkable film layer. For example, through the blending of such components in a film layer, the shrink initiation temperature may be adjusted to a desirable level. As a result, using extrapolations from testing various film layers having different ratios of high Tg polymers to low Tg polymers, the data may be extrapolated to determine the necessary ratio to achieve a certain shrink initiation temperature for a film. Such embodiments of the present invention allow a film to be prepared with a suitable shrink initiation temperature, which may avoid the film undesirably shrinking at normal storage or transportation temperatures.
[0025] These and other modifications and variations to the present invention may be practiced by those of ordinary skill in the art without departing from the spirit and scope of the present invention, which is more particularly set forth in the appended claims. In addition, it should be understood that aspects of the various embodiments may be interchanged in whole or in part. Furthermore, those of ordinary skill in the art will appreciate that the foregoing description is by way of example only, and it is not intended to limit the invention as further described in such appended claims. Therefore, the spirit and scope of the appended claims should not be limited to the exemplary description of the versions contained herein.

Claims

Claims What is claimed is:
1. A shrink film with at least a first shrinkable film layer comprising a blend of: a shrinkable polymer having a high glass transition temperature, and
a shrinkable polymer having a low glass transition temperature.
2. The shrink film of claim 1 wherein the shrinkable polymer having a high glass transition temperature is a cyclic polyolefin copolymer.
3. The shrink film of any one of claims 1-2 wherein the shrinkable polymer having a low glass transition temperature is a cyclic polyolefin copolymer.
4. The shrink film of any one of claims 1-3 wherein the high glass transition temperature polymer has a glass transition temperature in the range of about 85° C to about 165° C.
5. The shrink film of any one of claims 1-3 wherein the high glass transition temperature polymer has a glass transition temperature in the range of about 90° C to about 160° C.
6. The shrink film of any one of claims 1-3 wherein the high glass transition temperature polymer has a glass transition temperature in the range of about 95° C to about 155° C.
7. The shrink film of any one of claims 1-5 wherein the low glass transition temperature polymer has a glass transition temperature of less than about 85° C.
8. The shrink film of any one of claims 1-5 wherein the low glass transition temperature polymer has a glass transition temperature in the range of about -60° C to about 84° C.
9. The shrink film of any one of claims 1-5 wherein the low glass transition temperature polymer has a glass transition temperature in the range of about -100° C to 83° C.
10. The shrink film of any one of claims 1-5 wherein the low glass transition temperature polymer has a glass transition temperature in the range of about -35° C to about 82° C.
11. The shrink film of any one of claims 1-10 wherein the shrink film is a single layer film.
12. The shrink film of any one of claims 1-10 wherein the shrink film is a multilayer layer film.
13. The shrink film of any one of claims 1-10 wherein the shrink film is a multilayer film and a second shrinkable film layer comprises a shrinkable polymer having a high glass transition temperature and a shrinkable polymer having a low glass transition temperature.
14. The shrink film of any one of claims 1-13 wherein the first shrinkable film layer further comprises an additional polymer.
15. The shrink film of claim 14 wherein the additional polymer is low density polyethylene.
16. The shrink film of claim 14 wherein the additional polymer is linear low density polyethylene.
17. The shrink film of any one of claims 1-16 wherein the shrink film comprises an elastomer.
18. The shrink film of any one of claims 1-17 wherein the weight ratio shrinkable polymer having a high glass transition temperature and a shrinkable polymer having a low glass transition temperature in the first shrinkable film layer is in the range of about 60:40 to about 1:99.
19. The shrink film of any one of claims 1-18 further comprising a core layer.
20. The shrink film of claim 19 wherein the core layer is comprised of a polyolefin.
21. The shrink film of claim 19 wherein the core layer is comprised of a material selected from the group consisting of low density polyethylene, linear low density polyethylene, medium density polyethylene, ethyl vinyl acetate, polypropylene, elastomers, plastomers, styrene ethylene butylene styrene, poly(styrene-butadiene-styrene), poly(styrene-isoprene- styrene) (SIS), terephthalate glycol-modified (PETG), polyethylene terephthalate (PET), and blends thereof.
22. The shrink film of any one of claims 1-10 and 12-21 wherein the film is a multilayer film and layers comprising a blend of at least one high Tg polymer and one low Tg polymer constitute at least about 5% of the total thickness of a multilayer film.
23. The shrink film of any one of claims 1-10 and 12-21 wherein the film is a multilayer film and layers comprising a blend of at least one high Tg polymer and one low Tg polymer constitute about 2% to about 30% of the total thickness of the film.
24. The shrink film of claim wherein the film is configured such that a shrink initiation temperature of the film is substantially controlled by a weight ratio of the shrinkable polymer high glass transition temperature and the shrinkable polymer having a low glass transition temperature controls.
25. A method for preparing a shrinkable film, wherein the method comprises:
preparing a blend comprising a shrinkable polymer having a high glass transition temperature and a shrinkable polymer having a low glass transition temperature, and
forming a film from the blend.
26. The method of claim 25 wherein the film is a single layer film prepared from the blend.
27. The method of claim 25 wherein the film is a multilayer film prepared from the blend.
28. The method of any one of claims 25-27 wherein the film is formed by extrusion.
29. The method of any one of claims 25-28 wherein the weight ratio of the shrinkable polymer having a high glass transition temperature and the shrinkable polymer having a low glass transition is selected to achieve a desired shrink initiation temperature of the film.
PCT/US2014/045288 2013-07-02 2014-07-02 Heat activated shrink films Ceased WO2015003077A1 (en)

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CN201480048313.2A CN105492328B (en) 2013-07-02 2014-07-02 Hot activation shrink film
EP14742434.5A EP3016865B1 (en) 2013-07-02 2014-07-02 Heat activated shrink films
AU2014284262A AU2014284262A1 (en) 2013-07-02 2014-07-02 Heat activated shrink films
CA2917301A CA2917301C (en) 2013-07-02 2014-07-02 Heat activated shrink films
AU2018203060A AU2018203060C1 (en) 2013-07-02 2018-05-02 Heat activated shrink films
AU2019202531A AU2019202531B2 (en) 2013-07-02 2019-04-11 Heat activated shrink films
AU2020203916A AU2020203916A1 (en) 2013-07-02 2020-06-12 Heat activated shrink films

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018024351A1 (en) * 2016-08-01 2018-02-08 Giesecke+Devrient Currency Technology Gmbh Multi-layered film stack and card-shaped data carrier

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160236456A1 (en) * 2015-02-17 2016-08-18 aePlasma 41 Co., Ltd. Method of adhering ethyl vinyl acetate copolymer or derivative thereof layer to thermoplastic elastomer layer and laminate
CN108602928B (en) * 2016-02-12 2022-01-28 埃克森美孚化学专利公司 Cycloolefin copolymer and process for producing the same
US11141961B2 (en) 2017-05-19 2021-10-12 Exxonmobil Chemical Patents Inc. Shrink films comprising a cyclic-olefin copolymer core
SG11201910691TA (en) 2017-07-06 2020-01-30 Exxonmobil Chemical Patents Inc Polyethylene compositions comprising cyclic-olefin copolymers
BR112020003678B1 (en) 2017-08-23 2024-03-05 Dow Global Technologies Llc COMPOSITION, FILM AND ARTICLE
US10787564B2 (en) 2018-01-11 2020-09-29 Exxonmobil Chemical Patents Inc. Polyethylene compositions and articles manufactured therefrom
WO2019209334A1 (en) 2018-04-27 2019-10-31 Exxonmobil Chemical Patents Inc. Polyethylene films and methods of making the same
CN112358821A (en) * 2020-10-21 2021-02-12 永生运佳(宣城)薄膜科技有限公司 PETG self-adhesion protection film

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1526965A1 (en) * 2002-08-05 2005-05-04 Cryovac, Inc. High free shrink, high modulus, low shrink tension film with elastic recovery
US20080292225A1 (en) * 2007-05-21 2008-11-27 Dayrit Richard M Bag made from high-strength heat-shrinkable film exhibiting directional tear, and process utilizing same
US20120021151A1 (en) * 2010-04-15 2012-01-26 Tatarka Paul D Transparent, Flexible Products Made With Partially Crystalline Cycloolefin Elastomer

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10009646A1 (en) * 2000-03-01 2001-09-13 Ticona Gmbh Polymer mixture containing amorphous polyolefin, useful for preparing e.g. axially oriented films, has controllable relaxation and shrinkage properties
DE10238516A1 (en) * 2002-08-21 2004-03-04 Ticona Gmbh Polyolefin multilayer film, process for its production and its use
US20060210743A1 (en) * 2005-03-17 2006-09-21 Cryovac, Inc. Abuse-resistant retortable packaging film having oxygen barrier layer containing blend of amorphous polyamide and semicrystalline polyamide
DK1992468T3 (en) * 2005-11-21 2017-02-27 Plastic Suppliers Inc Methods for molding polylactic acid shrink film
US20080005065A1 (en) * 2006-02-27 2008-01-03 Microsoft Corporation Base business object key
WO2007132641A1 (en) * 2006-05-12 2007-11-22 Daicel Chemical Industries, Ltd. Cycloolefinic resin composition
ES2397870T3 (en) * 2006-10-05 2013-03-12 Treofan Germany Gmbh & Co. Kg Opaque film made of PLA simultaneously stretched
KR101450900B1 (en) * 2008-04-11 2014-10-14 엘지디스플레이 주식회사 Display device
CN102196908A (en) * 2008-10-24 2011-09-21 埃克森美孚石油公司 Multilayer shrink films, labels made therefrom and their uses
US8653198B2 (en) * 2009-03-26 2014-02-18 Fina Technology, Inc. Method for the preparation of a heterophasic copolymer and uses thereof
JP2011029952A (en) * 2009-07-27 2011-02-10 Renesas Electronics Corp Wireless communication apparatus, and communication method of the same
KR101712177B1 (en) * 2010-06-29 2017-03-07 코오롱인더스트리 주식회사 Shrink Films and Manufacturing method thereof
CN102431258B (en) * 2011-09-01 2014-04-30 广州市得力仕食品包装有限公司 Multilayer heat shrinkage film
EP2918408A1 (en) * 2011-12-22 2015-09-16 Avery Dennison Corporation Flexible Barrier Films Containing Cyclic Olefins

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1526965A1 (en) * 2002-08-05 2005-05-04 Cryovac, Inc. High free shrink, high modulus, low shrink tension film with elastic recovery
US20080292225A1 (en) * 2007-05-21 2008-11-27 Dayrit Richard M Bag made from high-strength heat-shrinkable film exhibiting directional tear, and process utilizing same
US20120021151A1 (en) * 2010-04-15 2012-01-26 Tatarka Paul D Transparent, Flexible Products Made With Partially Crystalline Cycloolefin Elastomer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018024351A1 (en) * 2016-08-01 2018-02-08 Giesecke+Devrient Currency Technology Gmbh Multi-layered film stack and card-shaped data carrier
US11167535B2 (en) 2016-08-01 2021-11-09 Giesecke+Devrient Mobile Security Gmbh Multi-layer film stack and card-shaped data carrier

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AU2018203060A1 (en) 2018-05-17
AU2014284262A1 (en) 2016-02-04
AU2020203916A1 (en) 2020-07-02
AU2018203060B2 (en) 2019-05-09
CN105492328A (en) 2016-04-13
AU2019202531B2 (en) 2020-05-14
US20150010741A1 (en) 2015-01-08
AU2019202531A1 (en) 2019-05-02
CA2917301C (en) 2021-12-14
AU2018203060C1 (en) 2021-04-22
CN105492328B (en) 2018-04-13
EP3016865A1 (en) 2016-05-11
EP3016865B1 (en) 2019-08-21

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