WO2004082929A2 - Film metallise a blocage reduit - Google Patents

Film metallise a blocage reduit Download PDF

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Publication number
WO2004082929A2
WO2004082929A2 PCT/US2004/007351 US2004007351W WO2004082929A2 WO 2004082929 A2 WO2004082929 A2 WO 2004082929A2 US 2004007351 W US2004007351 W US 2004007351W WO 2004082929 A2 WO2004082929 A2 WO 2004082929A2
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WO
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Prior art keywords
film
ethylene
copolymer
coating
comprised
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Ceased
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PCT/US2004/007351
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WO2004082929A3 (fr
Inventor
Bruno R.L. Gringoire
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ExxonMobil Oil Corp
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ExxonMobil Oil Corp
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Publication of WO2004082929A2 publication Critical patent/WO2004082929A2/fr
Publication of WO2004082929A3 publication Critical patent/WO2004082929A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing atoms other than carbon or hydrogen
    • C08L23/0869—Copolymers of ethene with unsaturated hydrocarbons containing atoms other than carbon or hydrogen with unsaturated acids, e.g. [meth]acrylic acid; with unsaturated esters, e.g. [meth]acrylic acid esters
    • 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
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
    • 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
    • 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
    • C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
    • C08L23/30—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by oxidation
    • 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
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]

Definitions

  • This disclosure relates to metallized films having low temperature sealability characteristics with improved anti-blocking properties.
  • Packaging technology integrates elements of engineering, chemistry, food science, metallurgy, and other disciplines to provide the consumer fresh foods and nonfood products.
  • packaging films To protect product quality, it is often desirable to provide packaging films with the ability to provide a hermetic seal, i.e., a seal which does not permit gases, such as air, to enter the package.
  • films can be prepared which exclude moisture and oxygen, but permit the passage of light. In other cases, it is also important to prevent light from passing through the film barrier. Barrier properties can also be modified and/or enhanced by treatments such as heat and flame treatment, electrostatic discharge, chemical treatments, halogen treatment, ultra-violet light, plasma treatment and combinations thereof.
  • Form/fill/seal packaging systems operate by unwinding continuous film from bulk film rolls, followed by forming pouches, filling the pouches, and, finally, sealing the pouch closed.
  • the film must have sufficient flexibility to undergo machine folding from a flat orientation to a folded condition, and be subjected to a sealing function, which is part of high-speed packaging apparatus.
  • high-speed unrolling and folding are the primary concern.
  • An additional and very important aspect of the packaging process is the ability to effectively seal the pouch after it is filled with the product.
  • High-speed horizontal and vertical form/fill/seal systems include sealing functions at various stages of the packaging process.
  • individual pouches are formed by folding the multi-layer film in half followed by providing vertical seals along the length of the folded web and separating the pouches along the seals formed by vertical sealing.
  • the bottoms of the pouches can also be sealed.
  • the top of the pouch is sealed.
  • vertical form/fill/seal apparatus the continuous web is formed around a tube and the web is immediately joined together by a longitudinal sealing jaw as either a lap seal or a fin seal.
  • a second sealing function is present in a vertical form/fill/seal configuration which consists of a combination top and bottom sealing section (with a bag cut-off device in between).
  • the top-sealing portion seals the bottom of an empty bag suspended from the bag forming tube while the bottom portion seals the top of a filled bag.
  • the package is formed and filled by creating a heat-seal between two opposed layers of film to form a pocket and almost simultaneously sliding or dropping the product into the pocket.
  • a continuous flat web of packaging film is fed around a form which shapes it into a tube, the tube is slipped over a hollow form and the free edges of the tube are sealed together.
  • the tube so formed is then passed between a pair of hot sealing jaws which create a series of discrete packages by collapsing the film onto itself and forming a seal by the application of heat and pressure.
  • the product is introduced into each package through the hollow form in the interval between the heat seals.
  • the product is dropped into the package while the sealing jaws, which form the seal, are closed.
  • the heat seal should be strong enough to support and retain the product after the sealing jaws open to release the film. It is often desirable to release the sealing jaws soon after the seal is formed so a film which accomplishes this by exhibiting a high "hot tack" is very useful.
  • Cold sealable pressure-sensitive adhesives have been developed. These adhesives do not require the use of a heated element to seal the packages. However, these adhesives have high surface tack characteristics making them adhere to uncoated surfaces of the packaging film which makes them difficult to use because of film blocking (i.e., sticking).
  • An important feature in many modern packaging films is a metallic layer or coating that is usually applied by vapor deposition methods.
  • U.S. Patents 5,487,940 and 6,420,041 describe and refer to numerous exemplary metallized films.
  • Metal layers are well known in the packaging industry and can be deposited using any known method, for instance, vacuum deposition, electroplating, sputtering, etc.
  • the metal layer is one of vacuum deposited aluminum, copper, silver, chromium, gold, and mixtures thereof, with vacuum deposited aluminum being the most commonly used.
  • Metallized films are widely used for their moisture barrier properties.
  • Patents 5,287,615 and 6,013,353 disclose application of a layer of a low temperature sealable coating on the surface of a metallic film layer to protect the metal and to provide high seal strength.
  • the patents disclose coating an ethylene-unsaturated carboxylic acid copolymer composition on the metallic surface.
  • the coating may also contain a dispersed wax.
  • the disclosed films may optionally include the same type of coating on the side of the film opposite the metal layer.
  • a protective acrylic or other polymeric coating may be deposited over the metal layer under vacuum conditions as disclosed in U.S. Patent 4,842,893.
  • U.S. Patent 6,420,041 it is known to laminate a polymeric film layer over the metal layer of a film to protect the metal from scratching and scuffing during use.
  • the polymeric layer can improve the gauge, stiffness and puncture resistance of the overall film, and can further enhance the barrier properties of the film.
  • the polymeric layer can be oriented, unoriented, transparent or opaque.
  • the polymeric layer is laminated to the metal layer using any suitable adhesive.
  • This disclosure relates to low temperature sealing metallized films.
  • a first surface layer of the films is provided with low temperature sealability with an ethylene-unsaturated carboxylic acid copolymer coating.
  • a second surface layer of the film is provided with a metallized layer.
  • An oxidized polyethylene wax is blended into the copolymer coating material to reduce blocking between the low temperature sealing coating and the metallized layer.
  • the film is useful for highspeed packaging applications requiring sealability at low temperatures. The film exhibits low blocking performance during unwinding of the film while maintaining positive low temperature sealability characteristics.
  • the films described herein address this problem by providing a low temperature sealing metallized film that allows the metal layer to remain exposed while reducing the blocking disadvantages of conventional metallized films.
  • the films include single or multiple layers having a metallized layer on one surface and a seal layer on the other surface.
  • the propensity of the metallized surface layer to block is reduced by inclusion of at least one oxidized polyethylene wax emulsion in the seal layer.
  • the films are comprised of a substrate which may be a single or multilayer film.
  • the metallized layer or coating is provided on one surface of the substrate.
  • the low temperature sealable layer or coating is provided on the opposite surface of the substrate.
  • compositions are useful to provide the low temperature seal functionality on the surface of the film opposite the metallized layer.
  • the compositions include at least one ethylene copolymer comprising from about 65 wt. % to about 95 wt. % of ethylene and from about 5 wt. % to about 35 wt. % of an ethylenically unsaturated carboxylic acid or an ethylenically unsaturated ester.
  • exemplary suitable carboxylic acid monomers may be selected from acrylic acid, methylacrylic acid, maleic acid, crotonic acid, itaconic acid, citraconic acid, and mixtures thereof.
  • the ethylene copolymer of the low temperature composition comprises from about 75 wt. % to about 90 wt. % of ethylene and from about 10 wt. % to about 25 wt. % of acrylic acid or methacrylic acid.
  • the low sealing temperature composition comprises from about 75 wt. % to about 85 wt. % of ethylene and from about 15 wt. % to about 25 wt. % of acrylic acid or methacrylic acid.
  • the ethylene copolymer component of the composition may be comprised of one or a mixture of more than one ethylene copolymer as described above.
  • the at least one ethylene copolymer content ranges from about 75 wt.% to about 95 wt.%. In another embodiment, the at least one ethylene copolymer content ranges from about 80 wt.% to about 90 wt.%. In still another embodiment, the at least one ethylene copolymer content ranges from about 80 wt.% to about 85 wt.%.
  • the ethylene copolymer in the low temperature sealable coating may be obtained as a solution or fine dispersion of an ammonium salt of the copolymer in an ammoniacal water solution.
  • ammonia is given off and the ionized and water sensitive carboxylate groups are converted to largely unionized and less water sensitive free carboxyl groups.
  • sodium hydroxide is used.
  • the quantity of such metallic ions may be in the range sufficient to neutralize, for example, about 2% to about 80% of the total carboxylate groups in the copolymer in one embodiment. In another embodiment, from about 10% to about 50% of the carboxylate groups are neutralized.
  • the presence of the metallic ions has been found in many cases to result in an improvement in certain properties, e.g., coefficient of friction (COF), hot tack, and blocking, without an unacceptable sacrifice of other properties such as low sealing temperatures as described in U.S. Patent 5,419,960.
  • Suitable ethylene copolymers have melting points of about 65°C to about 105°C in one embodiment. In another embodiment, the melting points range from about 65°C to about 95°C. In a third embodiment, the melting points range from about 70°C to about 90°C.
  • Exemplary suitable ethylene copolymers for the low temperature sealing compositions described here are PRIMACOR 59801 available from Dow Chemical Company and ESCOR 5200 from ExxonMobil Chemical Company.
  • a variety of oxidized polyethylene waxes are useful for inclusion in the low temperature sealing coating compositions described herein. Polyethylene waxes are made from ethylene produced from natural gas or by cracking petroleum naphtha. Ethylene is then polymerized to produce waxes with various drop points, hardnesses and densities. Oxidized polyethylenes are readily subjected to emulsification, whereas non-oxidized polyethylenes largely are not. Inclusion of waxes in the formulations described herein is typically accomplished through the use of wax emulsions. However, techniques making use of waxes in other forms are within the contemplation of this disclosure.
  • Useful oxidized polyethylene wax materials include low molecular weight polyethylenes having a number average molecular weight of less than about 5000 in one embodiment. In another embodiment, the number average molecular weight is about 1000 to about 4000. In still another embodiment, the number average molecular weight ranges from about 1500 to about 2500.
  • the polyethylene waxes should generally be oxidized to an acid number of about 10 to about 41 in one embodiment. In another embodiment, the acid number ranges from about 12 to about 28. In another embodiment, the acid number is from about 12 to about 28. In a third embodiment, the acid number ranges from about 13 to about 17.
  • the oxidized polyethylene waxes may also be blended with non-oxidized waxes.
  • the oxidized polyethylene waxes have a drop point range of about 85°C to about 145°C in one embodiment. In another embodiment, the drop point ranges from about 95°C to about 140°C. In a third embodiment, embodiment, the drop point ranges from about 98°C to about 115°C. In still another embodiment, the drop point ranges from about 98°C to about 110°C. All drop points referred to herein are as determined by ASTM D3954.
  • the oxidized polyethylene waxes have a Brookfield viscosity at 140°C of from about 35 centipoises (cps) to about 400 cps in one embodiment. In another embodiment, the Brookfield viscosity ranges from about 170 cps to about
  • Exemplary useful oxidized polyethylene wax materials are available under the designations AC-629, AC-656, and AC-680 from Honeywell. These waxes have drop points of 101°C, 98°C, and 108°C, respectively.
  • the oxidized polyethylene waxes may be emulsified in water by known methods. Exemplary methods are disclosed in U.S. Patents 3,850,658 and
  • the particle size of the waxes in the emulsion should generally be as small as possible.
  • the oxidized polyethylene emulsions have wax particle sizes less than one micron and up to 5 microns. Generally, the wax particles in the emulsions should not exceed 50 microns in particle size.
  • the emulsions comprise from about 10 wt. % to about 60 wt. % wax.
  • the oxidized polyethylene wax component of the composition may be comprised of one or a mixture of more than one oxidized polyethylene wax as described above.
  • the at least one oxidized polyethylene wax content ranges from about 5 parts per hundred (“Phr") to about 25 Phr based upon 100 parts by weight of the ethylene copolymer. In another embodiment, the oxidized polyethylene wax content ranges from about 7 Phr to about 20 Phr. In a third embodiment, the oxidized polyethylene wax content ranges from about 8 Phr to about 18 Phr. In still another embodiment, the oxidized ethylene content is about 10 Phr. All references to Phr concentrations used herein are on a dry basis of the indicated components based upon 100 parts by weight of the ethylene copolymer component, on a dry basis.
  • the low temperature sealable coating compositions may also contain particulate materials such as amorphous silica to reduce the tack of the coating at room temperature.
  • Amorphous silica is composed of particles which are agglomerations of smaller particles and which have an average particle size of about 2 to about 9 microns in one embodiment. In another embodiment, the particle size is about 3 to about 5 microns.
  • the silica may be present in the sealable coating in a concentration of about 0.1 to about 2.0 Phr in one embodiment. In another embodiment, the concentration is about 0.2 to about 0.4 Phr. Other types of particulate materials can be used instead of amorphous silica.
  • Suitable materials include polymethylmetacrylate spheric particles with an average particle size of from about 2 ⁇ m to about 6 ⁇ m in one embodiment.
  • Such particulates are available under the designations EPOSTAR MA 1002 AND EPOSTAR MA 1004 manufactured by Nippon Shokubai Co., LTD and CALIBRE CA 6-6 manufactured by Polymer System.
  • silicone spherical particles with an average particle size of from about 2 ⁇ m to about 6 ⁇ m in one embodiment are suitable.
  • Exemplary silicone particles are available under the designation TOSPEARL manufactured by Toshiba Silicone Co., LTD.
  • Other optional additives which may be included in the sealable coating of the films include other particulate materials such as talc which may be present in an amount, for example, of about 0.1 to 2 Phr, cross-linking agents such as melamine formaldehyde resins which may be present in an amount, for example, of about 0.1 to 20 Phr, and anti-static agents such as poly(oxyethylene) sorbitan monooleate which may be present in an amount, for example, of about 0.1 to 6 Phr.
  • An anti-bacterial agent may also be present.
  • Sodium hydroxide may be included as well.
  • the low temperature sealable coating composition may be applied in any suitable manner such as by gravure coating, roll coating, dipping, spraying, etc. Squeeze rolls, doctor knives, etc., are useful to remove the excess coating solution.
  • the coating compositions will ordinarily be applied in such an amount that there will be deposited following drying, a smooth, evenly distributed layer of from about 0.3 to about 1.8 grams per square meter of film surface in one embodiment.
  • the coating is applied at a thickness of about 0.5 g/m2 to about 1.2 g/m2.
  • the thickness is from about 0.6 g/m2 to about 1.0 g/m2.
  • the thickness of the applied coating is such that it is sufficient to impart the desired sealability, coefficient of friction (COF), and hot slip characteristics to the substrate polymer film.
  • the coating, once applied to the film may be dried by hot air, radiant heat or by any other suitable means thereby providing a non-water soluble, adherent, glossy coated film product useful, for example, as a packaging film.
  • the substrates to which the metallized layer and the low sealing temperature layers are applied may be any single or multi-layer thermoplastic material that can be formed into a film.
  • the substrate can be clear or opaque.
  • the opacity of opaque films may be achieved by cavitating, creating voids, in one or more layers of the polymeric film substrate or by other means.
  • thermoplastic materials include any polyolefin such as polypropylene, polyethylene, polybutene, polystyrene, polyvinyl chloride, ethylene containing copolymers such as ethylene-propylene copolymers, ethylene containing terpolymers such as ethylene-butylene-propylene terpolymers, and blends thereof.
  • suitable film materials include polyethylene terephthalate, other polyesters (including but not limited to polyethylene terephtalate glycol [PETG], polyethylene naphthalate [PEN] and liquid crystalline polymers [LCP]), and nylon, including oriented nylon.
  • exemplary skin layers comprise polyethylene, including medium and high-density polyethylene, polypropylene, copolymers of propylene and ethylene and terpolymers of propylene, ethylene and butylenes, and blends thereof.
  • any of the various film layer materials can contain processing aids or inorganic particulates such as titanium dioxide or void initiating agents to enhance the whiteness or color of the substrate or to enhance anti-blocking properties.
  • processing aids or inorganic particulates such as titanium dioxide or void initiating agents to enhance the whiteness or color of the substrate or to enhance anti-blocking properties.
  • Exemplary void initiators and techniques are disclosed in U.S. Patents 5,885,721 and 6,168,826.
  • the substrate may be a single or multiple layers.
  • the substrate may be a 3 -layer polymeric film which comprises a core layer and two outer layers, the core layer comprising polypropylene.
  • the substrate may be a 5-layer polymeric film which comprises a core layer, two intermediate layers contiguous to the central core layer and two outer layers, the polymer of at least one of the intermediate layers can comprise polypropylene.
  • thermoplastic film which can be advantageously used in the substrate is molecularly oriented isotactic polypropylene.
  • the film After extrusion of the substrate, for example, the base polypropylene film, utilizing conventional extrusion techniques, the film is heated and molecularly oriented by stretching it both in the longitudinal and transverse directions.
  • the resulting oriented film exhibits greatly improved tensile and stiffness properties.
  • the polyolefin resin such as polypropylene
  • MD machine direction
  • TD transverse direction
  • the substrates may be oriented or hot-blown shrink films made from any of a number of processes.
  • the oriented films may be manufactured in a variety of processes including machine direction orientation (MDO), double bubble, LISIM®, tape bubble, trapped bubble or tenter framing.
  • MDO machine direction orientation
  • LISIM® double bubble
  • tape bubble tape bubble
  • trapped bubble trapped bubble or tenter framing.
  • the hot-blown films are typically manufactured in a simple bubble process.
  • a useful low temperature sealing metallized film should demonstrate a variety of favorable characteristics including the ability to provide an adequate seal at low temperatures and resistance to blocking following storage and transport. Evaluations were conducted on six oxidized polyethylene waxes to determine suitability for inclusion in low temperature sealable coatings on a flexible substrate opposite a metallized layer. The waxes were evaluated in the form of aqueous emulsions available from Michelman, Inc. under the designations indicated in Table I which also contains physical properties of the emulsions. Table I also identifies the specific designations of the waxes used to make the emulsions. All wax designations having the prefix "AC" are available from Honeywell. Two waxes are available from Carroll Scientific, Inc. or Eastman Chemical Company, as indicated. The low temperature sealable coatings are referred to simply as "Coating" in the following test results.
  • a comparative formulation was produced with 4 Phr camauba wax in place of the 15 Phr oxidized polyethylene wax.
  • a suitable camauba wax is available from Michelman, Inc. under the designation ML 160.
  • the formulations were adjusted to 15% solids with demineralized water and coated with a kiss coating head, with the gravure roll turning in reverse to achieve a coating weight of 0.75 g/m 2 .
  • the coatings were applied on a 29 ⁇ m 3 layer base film, corona treated and primed with polyethyleneimine.
  • the base film outer skin layers were a propylene-ethylene-butylene terpolymer resin. Table II
  • Sealbility determined on a crimp sealer for .75 second dwell time at a pressure of 137.8 kPa. Values are in g/25mm.
  • Metal adhesion testing was conducted by metallizing the wax modified coatings and evaluating their affinity towards metal by testing metal adhesion to the coatings with an adhesive tape after two pulls. No metal transfer means a high affinity of the coating to metal and provides an indication about the blocking that can be expected when the coatings are in contact with metallized surface on reels. Metal transfer indicates lower blocking tendency to metal.
  • Coating/metal blocking was evaluated in accelerated test (60°C, 5171 kPa and 1 hour). The test is conducted using a heated press Model C, manufactured by Carver, Menomonee Falls WI, USA.
  • the peel tester figures in column 2 indicate the force recorded for a very slow pulling speed (15 cm /min)
  • column 3 indicates the level of metal transfer from the metallized side to the Coating side
  • column 4 simulates the behavior when unwinding a reel where separation speed is high. Blocking values are in g/25 mm.
  • Emulsion ME 10325 was subjected to additional testing to evaluate the impact of wax concentration on the performance of this emulsion.
  • the results of the additional testing are reported in the following Tables XII-XNI.
  • a new batch of comparative coating was prepared for these tests in the same manner as described above for the data in Tables II-XI.
  • a trial run on a 25 ⁇ m film printed on the metallized side and coated with a low temperature sealable coating formulation including 10 Phr of ME 20325 wax on the other side provided very good machinability on a HFFS Rekord machine and showed a slight increase of 5°C to 10°C in minimum sealing temperature compared to the unmodified low temperature sealable coating formulation.
  • This testing demonstrates that the formulation is suitable for use on a reel of a HFFS packaging machine.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

On a découvert que les films d'emballage scellables à basse température ont une tendance au blocage réduit lorsqu'une cire de polyéthylène oxydée est mélangée à une composition scellable à basse température contenant un copolymère d'acide éthylène-carboxylique. Lesdits films sont utiles pour des applications d'emballage à grande vitesse nécessitant une scellabilité à basse température. Ces films présentent des caractéristiques de blocage faibles lors de leur déroulement tout en conservant des caractéristiques de scellabilité à basse température positive.
PCT/US2004/007351 2003-03-14 2004-03-09 Film metallise a blocage reduit Ceased WO2004082929A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/389,384 US20040180162A1 (en) 2003-03-14 2003-03-14 Reduced blocking metallized film
US10/389,384 2003-03-14

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WO2004082929A2 true WO2004082929A2 (fr) 2004-09-30
WO2004082929A3 WO2004082929A3 (fr) 2005-01-20

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CN104497506A (zh) * 2014-12-26 2015-04-08 江苏华信新材料股份有限公司 一种用于智能卡的pha印刷膜片及其制备方法

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US10821703B1 (en) * 2014-06-27 2020-11-03 Vikase Companies, Inc. Additive transferring film
JP6014743B1 (ja) 2015-11-30 2016-10-25 住友化学株式会社 非水電解液二次電池用セパレータおよびその利用

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CN104497505A (zh) * 2014-12-26 2015-04-08 江苏华信新材料股份有限公司 一种用于智能卡的pha保护膜片及其制备方法
CN104497506A (zh) * 2014-12-26 2015-04-08 江苏华信新材料股份有限公司 一种用于智能卡的pha印刷膜片及其制备方法

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