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
  • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
  • B32B7/04—Interconnection of layers
  • B32B7/06—Interconnection of layers permitting easy separation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
  • B65D65/02—Wrappers or flexible covers
  • B65D65/14—Wrappers or flexible covers with areas coated with adhesive
• • 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
  • B29C48/001—Combinations of extrusion moulding with other shaping operations
  • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
• • 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
  • B29C48/001—Combinations of extrusion moulding with other shaping operations
  • B29C48/002—Combinations of extrusion moulding with other shaping operations combined with surface shaping
• • 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
  • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
  • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
• • 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
  • B32B1/00—Layered products having a non-planar shape
• • 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
  • B32B1/00—Layered products having a non-planar shape
  • B32B1/08—Tubular products
• • 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
  • 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
  • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
• • 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
  • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
  • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
• • 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
• • 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
  • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
• • 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
  • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
• • 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
  • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
  • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
  • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
• • 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
  • B32B38/00—Ancillary operations in connection with laminating processes
  • B32B38/06—Embossing
• • 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
  • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
  • B32B7/04—Interconnection of layers
  • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
  • B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D33/00—Details of, or accessories for, sacks or bags
  • B65D33/007—Details of, or accessories for, sacks or bags for facilitating the separation of the two walls, e.g. walls of inequal height, tabs; for maintaining the mouth of the sack or bag open
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
  • B65D65/38—Packaging materials of special type or form
  • B65D65/40—Applications of laminates for particular packaging purposes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes or webs of flexible sheet material, e.g. in folded wrappers
  • B65D75/52—Details
  • B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
  • B65D75/5805—Opening or contents-removing devices added or incorporated during package manufacture for tearing a side strip parallel and next to the edge, e.g. by means of a line of weakness
• • 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
  • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
  • B29K2101/12—Thermoplastic materials
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2031/00—Other particular articles
  • B29L2031/712—Containers; Packaging elements or accessories, Packages
  • B29L2031/7128—Bags, sacks, sachets
• • 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
  • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
  • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
  • B32B2037/148—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers whereby layers material is selected in order to facilitate recycling of the laminate
• • 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
  • B32B2250/24—All layers being polymeric
• • 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
  • B32B2250/24—All layers being polymeric
  • B32B2250/242—All polymers belonging to those covered by group B32B27/32
• • 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
  • B32B2255/00—Coating on the layer surface
  • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
• • 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
  • B32B2255/00—Coating on the layer surface
  • B32B2255/26—Polymeric coating
• • 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
  • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
  • B32B2307/514—Oriented
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
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  • B32B2307/00—Properties of the layers or laminate
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  • B32B2307/514—Oriented
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• • B—PERFORMING OPERATIONS; TRANSPORTING
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• • B—PERFORMING OPERATIONS; TRANSPORTING
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• • B—PERFORMING OPERATIONS; TRANSPORTING
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• • B—PERFORMING OPERATIONS; TRANSPORTING
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• • B—PERFORMING OPERATIONS; TRANSPORTING
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• • B—PERFORMING OPERATIONS; TRANSPORTING
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• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
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• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives

Definitions

• the present invention relates to a multilayer polymeric film with release effect which is oriented at least monoaxially and has a total thickness ⁇ 18 ⁇ m, preferably ⁇ 12 ⁇ m, having on at least one surface an at least partial embossment, and the use of the inventive polymeric film as packaging material, preferably for individually packaged hygiene products or incontinence products.
• polymeric films with release effect are used for numerous applications, such as, for example, as protective films and/or release films for adhesive products which are used in industrial areas, such as in the construction sector, in the furniture industry, or in the packaging industry, for example.
• Polymeric films with release properties are also used preferentially in the hygiene sector for the packaging of adhesive articles, preferably self-adhesive articles, preferably for single use Since such hygiene articles, like pantiliners or sanitary towels, but also incontinence articles, are packaged individually with an increasing tendency, the demand for such packaging material is rising increasingly.
• a multilayer polymeric film with release properties which is oriented at least monoaxially and has a total thickness of ⁇ 18 ⁇ m, preferably ⁇ 12 ⁇ m, more particularly of 5 ⁇ m to ⁇ 12 ⁇ m, having an at least partial embossment on at least one of its surfaces.
• the inventive multilayer polymeric film is characterized in that it has an at least monoaxial orientation in machine direction of at least 1:2, preferably of 1:3 to 1:5.
• the inventive polymeric film can also be biaxially orientated, which means it could also be orientated transversely to the machine direction in a range of 1:2 to 1:3.5.
• biaxial orientation i.e., of orientation both in machine direction and transversely to the machine direction
• the orientation ratio in these two directions may be different, in which case the orientation in machine direction is preferably higher than transversely to the machine direction.
• the inventive polymeric film is a multilayer film, having preferably at least three layers, more preferably at least five layers. In other preferred embodiments, the polymeric film of the invention may even have 7 to 11 layers.
• the inventive multilayer polymeric film comprises a layer sequence composed of the following polymer layers:
• the layers of the inventive polymeric film are produced from thermoplastic polymers selected from the group comprising polyolefins, polyamides, polyesters, biodegradable polymers, copolymers of at least two monomers of the mentioned polymers and mixtures of at least two of the mentioned polymers.
• the inventive polymeric film consists of at least 50 wt %, more preferably of at least 70 wt %, of polyolefins, olefin copolymers or mixtures thereof, with the exception of cyclo-olefins or cyolo-olefin copolymers or mixtures thereof.
• the layers (a) and (e) and, optionally also layer (c) of the inventive multilayer film are based, in each case identically or differently, on polyolefins and olefin copolymers of ⁇ , ⁇ -unsaturated olefins having 2-8, preferably 2-3, carbon atoms, which are preferably selected from the group comprising polyethylenes (PE)—especially polyethylenes with a low-density between 0.86 and 0.93 g/cm 3 (LDPE), linear low-density polyethylenes with a density between 0.86 and 0.94 g/cm 3 (LLDPE), which as LLDPE include as comonomer one or more u-olefins having more than 2 carbon atoms, polyethylenes with a medium-density between 0.926 and 0.94 g/cm 3 (MDPE), polyethylenes with a high-density between 0.94 and 0.97 g/cm 3 (HDPE), copolymers of ethylene
• PE
• a mixture of at least one PE and at least one PP preferably a mixture of LDPE, MDPE or LLDPE or a mixture of LLDPE and/or MDPE and/or PP can be used, in which case the fraction of the MDPE or PP in the mixture is in each case 5 wt % to 80 wt %, based on the total weight of the mixture.
• the layers (a) and (e) may also consist of copolymers of olefin/vinylcarboxylic acid or of olefin/vinyl esters, such as copolymers of ethylene-acrylic acid (EAA), their esters such as (EMA), copolymers of ethylene-methacrylic acid (EMAA), their esters such as (EMMA), copolymers of ethylene-vinyl acetate with preferably 60-99 mol % of ethylene (EVA), or mixtures of in each case at least two of the before mentioned polymer.
• EAA ethylene-acrylic acid
• EMA copolymers of ethylene-methacrylic acid
• EMMA esters
• EMMA copolymers of ethylene-vinyl acetate with preferably 60-99 mol % of ethylene (EVA), or mixtures of in each case at least two of the before mentioned polymer.
• At least the layer (e) as surface layer may be based on at least one polyester or at least one copolyester which is preferably selected from the group comprising polyethylene terephthalates (PET, c-PET, a-PET) and copolymers such as coPET, PET, and coPBT).
• PET polyethylene terephthalates
• coPET PET
• coPBT coPBT
• a-PET amorphous PET
• c-PET crystalline PET
• coPET refers to copolyesters of ethylene glycol and terephthalic acid further including other monomers, such as branched or aromatic dials, for example.
• coPET refers to polybutylene terephthalates.
• the polyester or copolyester used have an intrinsic viscosity of preferably 0.1 to 2.0 dl/g, more preferably of 0.3 to 1.5 dl/g, more particularly of 0.6 to 1.0 dl/g, the methods for determining the intrinsic viscosity being known to a person skilled in the art.
• a comprehensive description of suitable PET and PET is disclosed in Kunststoffhandbuch Volume 3/1—technische Thermoplaste: Polycarbonate, Polyacetale, Polyester, Celluloseester; Carl Hanser Verlag, 1992, the content of which is hereby referenced in full.
• At least the layer (e) may be based on at least one biodegradable polymer.
• Suitable biodegradable thermoplastic polymers are at least one biodegradable polymer selected from the group comprising lactic acid homopolymers and copolymers, preferably polylactides, more preferably DL-lactide, L-lactide and D-lactide polymers, polyhydroxyalkanoates, cellulose, cellulose derivatives, thermoplastic starch, polyesters, preferably polycaprolactones, polyethers, at least partly hydrolyzed polyvinyl acetates, ethylene-vinyl alcohol copolymers and copolymers of at least two monomers of the mentioned polymers.
• the inventive multilayer film has at least one layer (c) with a barrier effect.
• a barrier effect particularly against loss of gas or loss of aroma, against migration of low molecular weight components and/or against impaired taste or impaired odor, or against moisture and/or against oils and fats,
• the layer (c) with a barrier effect against gases, preferably against O 2 , H 2 O vapor or loss of aroma, against migration of low molecular weight components and/or against impaired taste or impaired odor is based on at least one thermoplastic polymer selected from the group comprising ethylene-vinyl alcohol copolymers, polyvinyl alcohols, polyvinylidene chlorides, vinylidene chloride copolymers, polyether-polyamide block copolymers and mixtures of the polymers with ethylene-vinyl acetate copolymers. Preferred chloride fraction of 80% or more. Ethylene-vinyl alcohol copolymers are particularly preferred.
• the barrier effect against moisture and/or oils and fats is achieved preferably by providing a layer (c) being based on a thermoplastic, aliphatic or (partially) aromatic polyamide or copolyamide or mixtures thereof,
• PA polyamides
• coPA copolyamides
• aliphatic or (partially) aromatic polyamides preferably having a melting point in the range from 160 to 240° C., more preferably from 170 to 220° C.
• aliphatic polyamides of which at least one polyamide or copolyamide selected from the group comprising PA 6, PA 12, PA 6,6, PA 6,12, PA 6/6,6, PA 6,6/6, or partially aromatic polyamides such as PA6T and PA6I, With preference it is also possible to use polyamides having isophoronediamine units, A comprehensive description of polyamides and copolyamides is found in Kunststoff-Handbuch Volume VI, Polyamide, Carl Hanser Verlag Kunststoff, 1966; and Melvin I. Kohan, Nylon Plastics Handbook, Carl Hanser Verlag Kunststoff, 1995, the content of which is hereby referenced in full.
• homopolyamides and/or copolyamides selected from the group comprising thermoplastic, aliphatic, partially aromatic, and aromatic homopolyamides or copolyamides with isophoronediamine units.
• homopolyamides or copolyamides with isophoronediamine units can have further units derived from other aliphatic and/or cycloaliphatic diamines having 2-10 carbon atoms such as hexamethylenediamine and/or aromatic diamines having 6-10 carbon atoms such as p-phenylenediamine, and from aliphatic or aromatic dicarboxylic acids having 6-14 carbon atoms such as adipic acid, terephthalic acid or isophthalic acid, for example.
• homopolyamides or copolyamides having isophoronediamine units may be prepared from lactams having 4-10 carbon atoms such as from ⁇ -caprolactam, for example.
• homopolyamides and/or copolyamides For the preparation of homopolyamides and/or copolyamides the use of isophoronediamine as at least one diamine component is preferred to provide homopolyamides and/or copolyamides suitable for producing a layer (c) having isophoronediamine units.
• homopolyamides and/or copolyamides with isophoronediamine units are preferred and copolyamides derived from e-caprolactam, isophoronediamine and an aromatic dicarboxylic acid, preferably isophthalic acid, are especially preferred.
• the fraction of isophoronediamine units and isophthalic acid units in the polyamide component used for the layer (c) is at least 1 up to 10 wt %, especially preferably 2 to 6 wt %, based on the total weight of the polyamide component.
• thermoplastic polyesters listed before for the production of the layer (e) may also be used for producing the layer (c).
• layer (c) as barrier layer and an appropriate selection of suitable polymers it is possible to provide an inventive, multilayer polymeric film having a significantly reduced oxygen permeability in accordance with DIN 53380-3, which amounts to at most 10.00 cm 3 /(m 2 ⁇ d ⁇ bar) at 23° C.
• the oxygen permeability of the inventive multilayer polymeric film may even be reduced to at most 8 cm 3 /(m 2 ⁇ d ⁇ bar), preferably at most 7 or 6 cm 3 / m 2 ⁇ d ⁇ bar), more preferably at most 5, 4 or 3 cm 3 /(m 2 ⁇ d ⁇ bar), even more preferably at most 2, 1 or 0.5 cm 3 /(m 2 ⁇ d ⁇ bar), most preferably at most 0.4, 0.3 or 0.2 cm 3 /(m 2 ⁇ d ⁇ bar), and most particularly at most 0.1, 0.09 or 0.08 cm 3 /(m 2 ⁇ d ⁇ bar) (in each case at 23° C. and 50% rh).
• the layer (c) as barrier layer With the addition of the layer (c) as barrier layer and with appropriate selection of suitable polymers it is possible to reduce the water vapor permeability of the inventive multilayer polymeric film, at most, the values equal to the values mentioned before for the oxygen permeability; the water vapor permeability is determined in accordance with DIN ISO 53 122.
• the layer (c) functions as a barrier layer, it is joined preferably by the adhesion promoter layers (b) and (d) to the adjacent layers.
• adhesion promoter layers (b) and (d), identically or differently, are based preferably on a preferably modified polyolefin and/or olefin copolymer, preferably selected from the group comprising carboxyl group-modified or cyclic anhydride group-modified polyethylenes, polypropylenes, more particularly maleic anhydride group-modified polyethylenes, polypropylenes, and ethylene vinyl acetate copolymers.
• Copolymers modified with maleic anhydride are particularly preferred.
• the inventive, multilayer polymeric film comprises more than one layer (c) and comprises the following layer sequence;
• the layers (c), identically or differently, are based on homopolymers, copolymers or mixtures of polymers as described before, more preferably on polyamides ethylene-vinyl alcohol copolymers. This is also the case for the other layers.
• the layers of the inventive multilayer polymeric film may each have the same or different additives selected from the group comprising antioxidants, antiblocking agents, antifog agents, antistats, active antimicrobial ingredients, light stabilizers, UV absorbers, UV filters, dyes, color pigments, stabilizers, preferably heat stabilizers, process stabilizers, UV and/or light stabilizers, preferably based on at least one sterically hindered amine (HALS), process assistants, flame retardants, nucleating agents, crystallizing agents, preferably crystal seed formers, lubricants, fillers, such as CaCO3, silicates, peel additives, seal additives, waxes, we agents, surface-active compounds, preferably surfactants, and dispersants.
• HALS sterically hindered amine
• the layers of the inventive polymeric film may contain at least 0.01-30 wt %, preferably at least 0.1-20 wt %, of at least one of the before mentioned additives, based in each case on the total weight of the individual layer.
• the inventive polymeric film is not only at least monoaxial orientated, but is also embossed.
• at least one surface layer, preferably the layer (a) of the inventive polymeric film has an embossed structure at least on one particular region of the surface layer, more preferably on the entire surface of the layer, preferably of the surface layer (a).
• This embossed structure of the inventive release film is based. preferably on a repeating, regularly or irregularly arranged pattern.
• the embossed structure can be a continuous embossed structure such as a continuous groove structure for example, or two or more, preferably repeating, individual embossed structures, or a regularly repeating but inherently random embossed structure, in each case corresponding to the embossing roll used.
• each embossed structure can be based on a multiplicity of preferably repeating individual embossed structures.
• These respective individual embossed structures can be preferably a structure with embossed grooves, which have more or less pronounced embossed elevations such as ridges, for example, by which the embossed height of the film is defined as the sum total of embossment elevation and thickness of the unembossed oriented film—as measured according to DIN 53370 2006.
• a plan view may show a multiplicity of respectively different, preferably repeating, individual embossed structures such as, for example, preferably serpentine, sawtooth, hexagonal, diamond-shape, rhomboidal, parallelogrammatical, honeycomb, circular, dot-shaped, star-shaped, rope-shaped, reticular, polygonal, preferably triangular, tetragonal, more preferably rectangular and square, Pentagonal, hexagonal, heptagonal, and octagonal, wire-shaped, ellipsoidal, oval, and lattice-shape-designed patterns, it also being possible for at least two patterns to be superimposed on one another.
• individual embossed structures such as, for example, preferably serpentine, sawtooth, hexagonal, diamond-shape, rhomboidal, parallelogrammatical, honeycomb, circular, dot-shaped, star-shaped, rope-shaped, reticular, polygonal, preferably triangular, tetragonal, more preferably rectangular and square, Pentagonal
• the embossment elevations can each preferably have a length of up to one centimeter, particular preference being given to a length of 0.001 mm to 10 mm.
• the fraction of the elevations as a proportion of the total length of the embossed structure with indentations may be preferably 75%, more preferably from 5% to 60%, and more preferably from 10% to 50%.
• the elevations are arranged preferably at uniform or alternating repeating distances.
• the elevations of the individual embossed structures can also preferably have a curvature, i.e., a convex or concave structure.
• the embossed structure has repeating units of randomly arranged embossment indentations and embossment elevations.
• the embossment elevations of the embossed structure are to amount preferably to ⁇ 75%, more preferably ⁇ 50%, based on the overall embossed area of the inventive polymeric film.
• the embossed elevation of the optionally uniform embossed elevations of the inventive polymeric film amounts preferably to ⁇ 5 ⁇ m as measured according to DIN 53370 2006.
• the embossed elevation of the embossed structure on the inventive polymeric film of the invention is determined in accordance with DIN 53370 2005 by mechanical scanning of the surface. In this procedure, the embossed elevations are measured at not less than 10 locations, distributed uniformly in a line over the web width of the sample, whereby it being necessary to ensure that the scanning device does not compress the embossed structure of the polymeric film, and the average is formed, from which the thickness of the corresponding oriented unembossed polymeric film is subtracted.
• the multilayer polymeric film of the invention has an asymmetric embossed structure, i.e., an embossed structure which is present consistently through the whole thickness of the film and provides both the top face and the bottom face of the film with an embossment, meaning that these faces are no longer planar, however the extent of the embossment is different on the two sides of the film.
• the top face of the film is identified as that film side on which the embossing tool acts or has acted. Accordingly, the opposite (bottom) face of the film can have a weaker embossment (negative form).
• the shrinkability of the oriented embossed film is reduced, by more than 50% in relation to a corresponding oriented, but unembossed film.
• the inventive oriented, embossed film furthermore exhibits excellent tensile strength, good to very good tear behavior, and excellent puncture resistance.
• the inventive multilayer polymeric film can also have a release coating on one of its surface layers.
• the release coating is based preferably on a cured polysiloxane coating, which can be applied to the inventive multilayer polymeric film even before orientation or after orientation, or after orientation and embossing.
• the embossment and release coating generating the release effect are present over substantially the whole surface of the film, preferably except for at least one strip running in machine direction, or except for a part of the surface area, preferably in the form of repeat-accurate transverse strips.
• polysiloxane refers in the sense of the present invention to compounds polymer chains of which are composed alternately of silicon atoms and oxygen atoms.
• a polysiloxane is based on n repeating siloxane units (—[Si(R 2 )—O]—) n , which in each case independently of one another are disubstituted by two organic radicals R, where R preferably in each case is R 1 or OR 1 and R 1 in each case is an alkyl radical or an aryl radical.
• the cured polysiloxane coating is based preferably on a repeating dialkylsiloxane unit or on a repeating alkylarylsiloxane unit.
• the polysiloxane coating of the invention preferably has a crosslinked cyclic or catenated structure, more preferably a crosslinked catenated structure, which is linked by (D), (T), and/or (Q) units to form a two- or three-dimensional network.
• the number n of the repeating siloxane units [Si(R 2 )—O]—) n in the polysiloxane chain is termed the degree of polymerization of the polysiloxane.
• the cured polysiloxane coating of the inventive polymeric film is based preferably on at least one cured, i.e., crosslinked, polysiloxane selected from the group encompassing addition-crosslinked polysiloxanes, preferably those addition-crosslinked with metal catalysis, condensation-crosslinked, radically crosslinked and/or cationically crosslinked polysiloxanes.
• the polysiloxane coating is based on at least one cured polysiloxane which has been cured by thermal curing and/or with exposure to UV radiation.
• the polysiloxane coating is based preferably on at least one cured polysiloxane selected from the group encompassing polydialkylsiloxanes, preferably polydimethylsiloxanes, and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes, which in each case are cured.
• Thermally cured polysiloxanes may be obtained by thermal hydrosilylation of polysiloxanes containing silane functions with a compound containing at least one carbon double bond. UV curing takes place preferably after the orientation of the inventive film, whereas thermal curing is carried out preferably after orientation and after embossing.
• the inventive polymeric film can in principle be produced by any known production method such as, for example, by extrusion or by coextrusion.
• both individual layers and all the layers of the inventive polymeric film can be formed by extrusion, more particularly by blown film extrusion and/or flat film extrusion (cast extrusion), or preferably coextrusion, more particularly blown film coextrusion and/or flat film coextrusion (cast coextrusion), the latter being preferred.
• these additives are employed for processing by being blended, where appropriate in the form of a masterbatch, with the polymer component or components of the layer in question. This blending can take place dry in pellet/powder form or pellet/pellet form. It is also possible, however, for the additive to be added to the melted polymer component or components of the layer in question, preferably by metered addition in an extruder used for the extrusion of the layer in question.
• the melts corresponding to the individual layers of the film of the invention are coextruded simultaneously and jointly through a circular die or a flat die, the resulting film is taken off for solidification on one or more rolls, and the oriented film is heat-set.
• Biaxial orientation may be carried out sequentially or simultaneously. Sequential orientation is carried out generally in succession, with preference being given to successive biaxial orientation, where is orientation takes place first longitudinally (in machine direction) and transversely (perpendicular to the machine direction).
• sequential orientation is carried out generally in succession, with preference being given to successive biaxial orientation, where is orientation takes place first longitudinally (in machine direction) and transversely (perpendicular to the machine direction).
• film production by flat film extrusion with subsequent monoaxial or biaxial orientation, the polymer and/or the polymer mixture of the individual layers is compressed in an extruder and liquefied, it being possible for any additives added to be already present in the polymer or in the polymer mixture.
• melts are then pressed simultaneously through as flat die (slot die), and the multilayer film extruded is taken off on one or more takeoff rolls at a temperature of 10 to 100° C., preferably 10 to 50° C., and cools and solidifies.
• the inventive multilayer polymeric film is then oriented either only longitudinally or both longitudinally and transversely to the direction of extrusion, leading to orientation of the molecule chains.
• Longitudinal orientation will he carried out preferably at a temperature of 70 to 130° C., preferably 80 to 110° C., expediently with the aid of two rolls which run at different speeds in line with the target draw ratio, and the possible additional transverse orientation will be carried out preferably at a temperature of 120 to 180° C. by means of a corresponding tenter frame.
• the desired transverse, draw ratios can be set. Orientation in machine direction only is preferred in accordance with the invention.
• the orientation of the film is followed preferably by its heat-setting (heat treatment), where the film is held for about 0.1 to 10 s at a temperature of 100 to 160° C. Subsequently, where appropriate after interim storage, the film may be furnished with any release coating present and subsequently embossed, or may be furnished, after having been embossed, with any release coating present. Another possibility is for the extruded multilayer polymeric film to be provided, even prior to orientation, with any release coating present.
• the embossing of the inventive polymeric film with only a single-side embossed structure or with an entirely continuous embossed structure may be accomplished according to an embossing process, using a structuring or embossing calender comprising a system for applying a grid pattern, in-line or off-line.
• This calender preferably has counterrotating rolls arranged at a defined distance vertically one above another, the release film to be provided with an asymmetric embossed structure being supplied to the rolls and passed through the roll nip which forms, the nip width being variably adjustable.
• the grid roll mechanism here preferably comprises a first roll having a comparatively hard surface, more preferably a steel roll, and a second roll, which has a comparatively less hard surface and is formed preferably of an elastic material, more preferably of rubber or ebonite.
• the harder of the two rolls carries, in negative form, the pattern to be embossed into the polymeric film (embossing roll).
• the second roll opposite this roll, serves preferably as a counterpressure roll or pressing roll, and presses the polymeric film to be provided with a structured or embossed pattern against the first, embossing roll.
• the polymeric film is embossed preferably at elevated temperature, and therefore, in the case of off-line embossing, the polymeric film passes first through a heating roller mechanism, optionally thereafter is irradiated with infrared light, after which the above-described embossing operation proper takes place. After being embossed, the polymeric film may pass through a cooling roll mechanism for cooling.
• the negative form of the structure to be embossed is produced according to the methods customary and known to the person skilled in the art, and specific methods may be particularly advantageous, depending on structure and materials.
• the structures on the embossing roll may either have a continuous structure or else may be formed as an interrupted structure (sequence of individual embossed structures), with a combination of both structures also being possible.
• the respective structures on the embossing roll may have any of a very wide variety of geometric forms, depending on the intended (asymmetric) structure of the polymeric film.
• a further object of the present invention is the use of the inventive polymeric film as a removable release film or protective film, preferably for adhesive articles of any kind, more preferably for self-adhesive articles of any kind.
• inventive polymeric film as detachable packaging film and/or protective film for self-adhesive labels or adhesive tapes of any kind, especially in the construction industry, is a further subject of the present invention.
• inventive polymeric film as a removable, flexible packaging film and/or protective film for hygiene articles, preferably individually packaged, optionally folded, self-adhesive panty liners, sanitary towels or incontinence articles.
• the removable, flexible packaging material of the invention preferably has the advantage that it can be used to produce packaging which can be disposed of and can be opened with little noise, especially for individually packaged hygiene products.
• the noise produced in this context is ⁇ 60 [db], measured as equivalent continuous sound level L eq [db].
• a film sample in DIN A5 size is fixed centrally and horizontally on each long side by means of a clasp apparatus.
• One of the clasp apparatuses is immobile, while the other apparatus can be moved on an eccentric path in order to generate noises by continual compressing and stretching of the film sample.
• the speed of the eccentric drive during the measurement is 36 min ⁇ 1 .
• the equivalent continuous sound level L eq [db] is determined by means of a sound recording device, which records the noises during the continual compressing and stretching of the film sample for a duration of 30 seconds from a distance of 30 cm from the middle of the wide side of the DIN A5 film sample.
• the film sample must not be damaged during the stretching and compressing.
• the measuring device used is a measuring device from Brüel & Kjaer, 2250-L.
• a further object of the invention is also a flexible packaging material composed of an inventive polymeric film for individually packaged, adhesive articles, preferably for self-adhesive articles for single use.
• a further object of the present invention is a sanitary product or hygiene product provided with the inventive polymeric film as removable release film or protective film.
• Another subject of the present invention is a flexible packaging material composed of an inventive polymeric film for individually packaged, self-adhesive hygiene articles or incontinence articles.
• the shrinkage is measured according to DIN 5543/4. Accordingly, 10 samples in each case, measuring 100 mm ⁇ 100 mm, with the running direction marked in each case, are left in machine direction or transversely to the machine direction in a high-boiling oil bath of 90° C. for 3 minutes in each case; the average value of the change in length in the MD and in the CD, respectively, is averaged from each of the 10 samples, and the respective change is reported as shrinkage.
• Each of the multilayer polymeric films was produced by coextrusion on a blown film coextrusion line, initially with a total layer thickness of 40 ⁇ m. After the film bubble had been collapsed, it was supplied to a roll orienting unit and oriented by a factor of 1:4 in the longitudinal direction, meaning that the total film thickness resulting therefrom was 10 ⁇ m.
• the inventive polymeric films B1 and B2, following orientation, were given microembossment (embossment elevation) of about 5 ⁇ m on an embossing calender, and, for the inventive polymeric film a and also for the comparative polymeric films, the physical and also their shrinkage characteristics reported in table IV below were ascertained and reported.

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