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
  • B32B27/32—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
  • B32B27/06—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
  • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
• • 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
  • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
  • B32B27/283—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polysiloxanes
• • 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
• • 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
  • 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
  • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
  • B65D5/42—Details of containers or of foldable or erectable container blanks
  • B65D5/56—Linings or internal coatings, e.g. pre-formed trays provided with a blow- or thermoformed layer
  • B65D5/60—Loose, or loosely attached, linings
  • B65D5/603—Flexible linings loosely glued to the wall of the container
  • B65D5/606—Bags or bag-like tubes loosely glued to the wall of a "tubular" container
• • 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
• • 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
• • 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
  • 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
  • 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
  • C08L23/06—Polyethene
• • 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
  • C08L23/10—Homopolymers or copolymers of propene
  • C08L23/14—Copolymers of propene
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
  • C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
  • C09J123/04—Homopolymers or copolymers of ethene
  • C09J123/06—Polyethene
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
  • C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
  • C09J123/10—Homopolymers or copolymers of propene
  • C09J123/14—Copolymers of propene
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
  • C09J183/04—Polysiloxanes
• • 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
• • 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
  • B32B2250/03—3 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
  • 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
  • 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
  • B32B2307/54—Yield strength; Tensile strength
• • 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
  • B32B2307/582—Tearability
• • 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
  • B32B2323/04—Polyethylene
  • B32B2323/046—LDPE, i.e. low density polyethylene
• • 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
  • B32B2323/10—Polypropylene
• • 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
  • B32B2383/00—Polysiloxanes
• • 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
  • B32B2439/00—Containers; Receptacles
• • 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
  • B32B2439/00—Containers; Receptacles
  • B32B2439/70—Food packaging
• • 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
  • B32B2439/00—Containers; Receptacles
  • B32B2439/80—Medical packaging
• • 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
• • 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
  • B32B2555/00—Personal care
  • B32B2555/02—Diapers or napkins
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
  • C08F2500/08—Low density, i.e. < 0.91 g/cm3
• • 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
  • C08J2323/04—Homopolymers or copolymers of ethene
• • 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
  • C08J2323/10—Homopolymers or copolymers of propene
• • 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
  • C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
  • C08J2483/04—Polysiloxanes
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2203/00—Applications
  • C08L2203/16—Applications used for films
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2423/00—Presence of polyolefin
  • C09J2423/005—Presence of polyolefin in the release coating

Definitions

• the present invention relates to a multilayer polyolefin film comprising a layer sequence of a sealable layer (a) based on a polyethylene component having a density in the range from 0.910 to 0.940 g/cm 3 and a melting point in the range from 110° C.
• the tear propagation resistance of the polyolefin film in machine direction [MD] is ⁇ 5 N and the tear propagation resistance crosswise to the machine direction [CD] is at least four times higher than in [MD], measured in each case according to DIN 53356, and the tensile strength is of approximately equal magnitude in machine direction [MD] as crosswise to the machine direction [CD] and is ⁇ 15 N, measured according to DIN ISO 527-3, and to packaging produced therefrom for food, or packaging for preferably individually packaged hygiene products or individually packaged incontinence products, which optionally are self-adhesive.
• polyolefin films can be used for numerous applications, whereby the use of polyolefin films as packaging materials accounting for a considerable proportion of the use.
• packagings closed usually by sealing, are produced in particular for the food segment and oftentimes cannot be opened trouble-free.
• Particularly significant is for completely closed packaging, that the packaging can only be opened by tearing one of the sealing seams, so that the packaged contents can easily be spilt.
• a packaging material is also required to have sufficiently high mechanical properties, such as an extremely high puncture resistance and sealing seam strength, in order to facilitate the handling of the packaging produced from the corresponding packaging films. This is especially the case because the filled packages are usually stacked or layered one above another during storage and on transport, and the packagings must not be punctured thereby. This is of course also the case for frozen storage, in order to minimize the proportion of rejected products.
• the inventive multilayer polyolefin film preferably has a total thickness of 30-120 ⁇ m, preferably of 50-100 ⁇ m.
• layer sequence in the sense of the invention means that the layers (a), (b) and (c) are present in the order stated and are directly adjacent to one another. Additional layers and/or coatings may optionally be present on a surface of the layer sequence, such as a release coating, for example, preferably composed of cured polysiloxane.
• the layer (a) and/or the layer (c) has in each case preferably a layer thickness of 5-30 ⁇ m, and the layer (b) a layer thickness of 20-90 ⁇ m.
• the release coating where present, has a thickness of 1-2 ⁇ m at most, it is not referred to as a layer.
• the inventive polyolefin film consists preferably, at least to an extent of 95 wt %, of C 2 -C 8 olefin polymers, mixtures thereof or copolymers thereof, and optionally of the auxiliaries recited later on in the description.
• the polyolefin film of the invention comprises no polybutylene.
• the inventive polyolefin film also comprises no cyclic olefin polymers or copolymers.
• the inventive polyolefin film has no metal layer such as a metal foil applied, for example, by electrode sputtering or from the vapor phase.
• the layer (a) and/or the layer (c) of the inventive polyolefin film is based preferably on a polyethylene component having a density in the range from 0.915 to 0.940 g/cm 3 and a melting point in the range from 113° C. to 130° C., and is preferably heat-sealable.
• polyethylene component refers to at least one low-density polyethylene (LDPE), at least one linear low-density polyethylene (LLDPE), or a mixture of LDPE and LLDPE.
• LDPE low-density polyethylene
• LLDPE linear low-density polyethylene
• polyethylene having a low density in the sense of the invention is synonymous with the term “low-density polyethylene”, or “LDPE”, i.e., this term refers to unfoamed polyethylene of low density which is notable for a high degree of branching of the molecules, meaning that the polyethylene main chain carries 8 to 40 side chains of repeating ethylene units and has no polymerized units of other olefins.
• the polyethylenes having a low density used for the layers (a) to (c) preferably have a density in the range from 0.915 to 0.940 g/cm 3 , more preferably from 0.915 to 0.938 g/cm 3 .
• the polyethylene component of the layer (a) and/or of the layer (c) may also consist of a linear polyethylene having a low density.
• linear polyethylene having a low density in the sense of the invention is synonymous with the term “linear low-density polyethylene” or “LLDPE”, meaning that this term refers to unfoamed, linear, low-density polyethylene which has a low degree of branching of the molecules and preferably has a density in the range from 0.920 to 0.940 g/cm 3 and preferably comprises at least one ⁇ -olefin having 4-8 carbon atoms, more particularly hexene and/or octene, as comonomer in addition to the ethylene.
• LLDPE linear low-density polyethylene
• the polyethylene component of the layer (a) or of the layer (c) preferably consists of a mixture of 55-80 wt % of LDPE and 45-20 wt % of LLDPE, more preferably of 65-75 wt % of LDPE and 35-25 wt % of LLDPE.
• the melting point of the polyethylene component of the layer (a) and/or of the layer (c) is in the range from 110° C. to 130° C. and is lower by at least 5° C. than the melting point of the layer (b).
• the layer (a) and the layer (c) may be composed identically or differently.
• the two layers may differ in thickness or composition, however an identical composition for these two layers is preferred. The same applies to the respective layer thickness.
• the layer (a) and the layer (c) have an identical layer construction, preferably an identical layer thickness and/or an identical composition.
• the layer (b) is based on a polymer mixture of 51-85 wt % of at least one polyethylene having a density of 0.910 to 0.940 g/cm 3 and 15-49 wt %, based in each case on the total weight of the polymer mixture, of at least one propylene homopolymer or copolymer.
• the polyethylene present in the polymer mixture for composing the layer (b) is preferably at least one low-density polyethylene (LDPE) or at least one linear low-density polyethylene (LLDPE) or a mixture of LDPE and of LLDPE. Where a mixture of LDPE and LLDPE is used, the mixing ratio is preferably 30:70 wt % to 70:30 wt % of LDPE to LLDPE.
• LDPE low-density polyethylene
• LLDPE linear low-density polyethylene
• Suitable as second polymer component of the polymer mixture for composing the layer (b) is a propylene homopolymer or propylene (block) copolymer.
• propylene homopolymer an isotactic propylene homopolymer having a melting point of 140 to 170° C., preferably of 150 to 160° C. is used.
• propylene copolymer a copolymer of propylene and of up to 20 wt %, preferably ⁇ 15 wt %, of ethylene; with particular preference, a propylene/ethylene block copolymer with at least 3 wt %, more preferably with 4 wt % to 10 wt %, of ethylene may be used.
• a mixture of an LDPE and a propylene/ethylene block copolymer, or a mixture of an LLDPE and a propylene/ethylene block copolymer is used.
• a mixture of LDPE and a propylene homopolymer or a mixture of LLDPE and a propylene homopolymer can also be used.
• the inventive multilayer polyolefin film is distinguished by a tear propagation resistance in machine direction (MD) of ⁇ 5 N, preferably ⁇ 3 N, where the tear propagation resistance crosswise to the machine direction (CD) is at least four times higher than in (MD), measured in each case according to DIN 53356, and the tensile strength both in machine direction and crosswise to the machine direction has approximately the same value, preferably in each case ⁇ 15 N, more preferably ⁇ 20 N. Furthermore, the inventive polyolefin film has excellent puncture resistance values.
• Each of the layers of the inventive multilayer polyolefin film may contain the same or different additives and/or auxiliaries selected from the group encompassing antioxidants, antiblocking agents, antifogging agents, antistats, active antimicrobial ingredients, light stabilizers, UV absorbers, UV filters, dyes, color pigments, stabilizers, preferably heat stabilizers, process stabilizers, and UV and/or light stabilizers, preferably based on at least one sterically hindered amine (HALS), processing aids, flame retardants, nucleating agents, crystallization agents, preferably crystal nucleus formers, lubricants, optical brighteners, plasticizers, silanes, spacers, fillers, such as CaCO 3 , silicates, peel additives, sealing additives, waxes, wetting agents, surface-active compounds, preferably surfactants, and dispersing agents.
• HALS sterically hindered amine
• the layers of the inventive polymeric film may contain at least 0.01-15 wt %, preferably at least 0.1-10 wt %, based in each case on the total weight of an individual layer, of at least one of the before mentioned additives.
• the inventive polyolefin film may have a release coating (d) on one of its outer layers.
• the release coating is preferably based on a cured polysiloxane coating, which is applied to a surface of the inventive packaging film over substantially the whole surface, preferably apart from at least one strip running in machine direction, or over a partial area, preferably as crosswise strips in precise repeat.
• polysiloxane in the sense of the present invention refers to polymers which polymer chains are constructed in alternation of silicon atoms and oxygen atoms.
• a polysiloxane is based on n repeating siloxane units (—[Si(R 2 )—O]—) n , which each independently of one another are disubstituted by two organic radicals R, with R preferably in each case being R 1 or OR 1 and R 1 in each case being 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 inventive polysiloxane coating preferably has a crosslinked cyclic or chain-like structure, more preferably a crosslinked chain-like 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 referred to as the degree of polymerization of the polysiloxane.
• the cured polysiloxane coating, where present, of the inventive polyolefin film is based preferably on at least one cured, i.e., crosslinked, polysiloxane selected from the group comprising polysiloxanes which are addition-crosslinked, preferably addition-crosslinked with metal catalysis, condensation-crosslinked, radically crosslinked and/or cationically crosslinked.
• 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 (d) is based preferably on at least one cured polysiloxane selected from the group encompassing polydialkylsiloxanes, preferably polydimethylsiloxanes, and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes, each of which are cured.
• Thermally cured polysiloxanes may be obtained by thermal hydrosilylation of polysiloxanes having silane functions with a compound having at least one carbon double bond.
• UV curing like thermal curing, takes place after the production of the inventive polyolefin film, with UV curing being particularly preferred in accordance with the invention.
• inventive polyolefin film may be produced by known production methods such as by extrusion or by coextrusion, for example.
• Either individual layers or all the layers of the inventive multilayer polyolefin film may be produced by extrusion, more particularly by blown film extrusion and/or flat film extrusion (cast extrusion), or coextrusion, preferably blown film coextrusion and/or flat film coextrusion (cast coextrusion), with blown film (co)extrusion being preferred.
• it is possible to add the additive to the molten polymer component(s) of the respective layer 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 inventive polyolefin film are (co)extruded simultaneously and jointly through an annular die or a flat die, and the resulting film, when using an annular die, is blown up with air, preferably with a blow-up ratio of at least 1:1, more preferably of at least 1.5:1, very preferably of at least 2:1, and cooled, or, when using a flat die, is taken off by means of rollers, for solidification, and cooled.
• the polyolefin film may also be produced as a laminate comprising the coextruded layer sequence (a)-(c).
• the entire multilayer film is in the form of a preferably coextruded film bubble which may optionally be processed to form a flat-laid film.
• inventive polyolefin film is produced as a multilayer blown film, preferably by extrusion, more particularly by blown film coextrusion.
• inventive polyolefin film may be produced and processed partly or completely as a cast film.
• the polyolefin film is preferably unoriented or may be oriented monoaxially in MD.
• the polyolefin film produced as cast film may in this case be oriented monoaxially in a draw ratio of at least 1:1.5, preferably at least 1:2, more preferably 1:2 to 1:5.
• a release coating to be applied to at least one surface of the inventive polyolefin film, optionally after interim storage of the film.
• the inventive polyolefin film may be embossed and may have a single-sided embossing structure on one of its surface layers, or a continuous embossing structure.
• the embossing methods are known to the skilled person.
• a further subject of the invention is therefore the use of the inventive polyolefin film as packaging material.
• the inventive polyolefin film is especially suitable for producing packaging, preferably pouch packaging, individual-portion packaging, a sachet or a stick pack.
• a further subject of the invention is therefore the use of an inventive polyolefin film for producing packaging, preferably a pouch pack, an individual-portion pack, a sachet or a stick pack.
• the inventive polyolefin film is used preferably for producing packaging which is easy to open, since the film has a far lower tear propagation resistance in machine direction than crosswise to the machine direction.
• the package contents can easily be withdrawn from such packaging, since when the packaging is torn open and torn further, there is a straight, linear course to the tear. The risk of scattering or spilling of the packaged contents is therefore minimized.
• One subject of the present invention is an easy-to-open packaging comprising an inventive polyolefin film.
• an inventive packaging includes, in particular, the feature that it is easy to open, in addition to the easy and straight tear propagation behavior, without any need for a sealing seam of the packaging to be torn open.
• a sealing seam of the packaging For the tear-open direction of the inventive packaging, it is also possible, optionally, to make a notch or weakening in the direction of the lower tear propagation resistance of the inventive polyolefin film. If a notch or weakening is made, it ought preferably to be located in the sealing seam region.
• the sealing seam strength of the seams of the inventive packaging is greater than the tear propagation resistance in the marked tear-open direction.
• a further feature of the inventive packaging is that it has high puncture resistance values, thus giving it very good handling qualities; in other words, during storage, transport, and sale, it is less readily damaged by exposure to impacts than are films having similar tear propagation behavior.
• an inventive polyolefin film is also suitable as release film.
• a further subject of the present invention is therefore the use of an inventive polyolefin film as release film, more particularly with a release coatings as surface coating.
• the inventive polyolefin film is particularly suitable as release film and protective film on account of its particular monoaxial tear-off and/or tear propagation behavior.
• a further subject of the present invention is the use of the inventive polyolefin film as detachable release film or protective film, preferably for articles of any kind, more preferably for self-adhesive articles of any kind.
• the use of the inventive polyolefin film as detachable packaging film and/or protective film for self-adhesive labels or adhesive tapes of any kind, especially in the building industry, is a further subject of the present invention.
• inventive polyolefin film with a release coating is the use thereof as preferably detachable, flexible packaging film and/or protective film for hygiene articles, preferably individually packaged, optionally folded, possibly self-adhesive panty liners, sanitary towels or incontinence articles.
• inventive polyolefin film takes the form of a preferably detachable packaging wrapper, preferably for the possibly self-adhesive hygiene articles recited, preferably sanitary towels, panty liners or incontinence articles, which are preferably present in individually packaged form in the inventive packaging wrapper.
• the thickness of the respective polyolefin film was measured in accordance with DIN 53370 and reported as an average value.
• each inventive and comparative polyolefin film was measured according to DIN 53 356, the measurement being carried out on a sample size of 100 mm ⁇ 50 mm at a measuring velocity of 300 mm/min over a measuring length of 30 mm, with the initial values being disregarded in the evaluation. Determinations were made of the tear propagation resistance in machine direction (MD) and also crosswise to the machine direction (CD).
• the puncture resistance of the inventive and of the comparative polyolefin films was determined according to ASTM E 154-88 Part 10 and reported in [N].
• a straight-linear tear propagation behavior on the part of the inventive and comparative polyolefin films is assessed by measuring the deviation from a straight, linear course during tearing (tear propagation or tear removal). This deviation is reported in [mm].
• 10 samples in each case are cut in such a way that they have a length of 100 mm parallel to the machine direction (MD) and a width of 50 mm crosswise to the machine direction (CD). Furthermore, 10 samples are cut in such a way that they have a length of 100 mm crosswise to the machine direction (CD) and a width of 50 mm parallel to the machine direction (MD).
• a 50 mm incision, in the thread direction and parallel to the longitudinal side, is made in the middle of the transverse side of each of the individual samples, and underneath the incision each sample is provided, centrally and parallel to the longitudinal side, with a double-sided adhesive tape having a width of 20 mm and a length of 90 mm.
• a marker is used to mark a linear extrapolation line from the incision, and this line serves as a straight, linear tearing line for measuring the deviation.
• the tear behavior of the individual samples is determined under standard conditions (DIN 50014-23/50-2).
• one leg of the individual samples is fixed, in each case with the aid of the adhered, double-sided adhesive tape at a defined angle of 45° C. [ ⁇ ] on a metal bar having a width of 100 mm and a length of 350 mm.
• the metal bar is clamped into the lower tensioning jaw of an electronic tear destruction instrument (Zwick).
• the incised end of the unfixed leg (“the unfixed trouser leg”) of the individual samples is fastened by means of a double-sided adhesive tape to a stiff film strip which is approximately 400 mm long, and this strip is clamped into the upper tensioning jaw of the tear destruction instrument.
• the two legs of the individual samples are then pulled apart at an angle of 175° and with a velocity of 500 mm/min until the sample is completely separated.
• the average value is formed. This value serves for assessment of the linear tear behavior in machine direction (MD).
• the average value is likewise formed from the measured maximum deviations A of the 10 samples with dimensions of 100 mm (CD) ⁇ 50 mm (MD). This average value serves to assess the linear tear behavior crosswise to the machine direction (CD).
• the polyolefin films according to the comparative examples and also to the examples according to table II each consist of three layers and have the specified thickness.
• the individual layers of each polyolefin film are immediately adjacent to each other in the sequence in which they are listed below.
• the polyolefin films were each produced by blown film coextrusion. The blow-up ratio in each case was 3:1.

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• 2016
  • 2016-07-27 WO PCT/EP2016/001295 patent/WO2017016660A1/fr active Application Filing
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