Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • 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
  • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
  • B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/32—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
  • 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
  • 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
  • B32B2250/24—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
  • B32B2250/00—Layers arrangement
  • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
  • B32B2307/514—Oriented
  • B32B2307/516—Oriented mono-axially
• • 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
  • B32B2307/518—Oriented bi-axially
• • 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
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
  • B32B2307/582—Tearability
  • B32B2307/5825—Tear resistant
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/724—Permeability to gases, adsorption
  • B32B2307/7242—Non-permeable
  • B32B2307/7244—Oxygen barrier
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/724—Permeability to gases, adsorption
  • B32B2307/7242—Non-permeable
  • B32B2307/7246—Water vapor barrier
• • 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
  • B32B2439/02—Open containers
  • B32B2439/06—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
  • 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
  • B32B2597/00—Tubular articles, e.g. hoses, pipes

Definitions

• the present invention relates to a multilayer film comprising a layer sequence of a layer (a) composed of at least one low density polyethylene in the range of 0.915 to 0.935 g / cm 3 or a mixture of (a) at least one lower density polyethylene in the range from 0.915 to 0.935 g / cm 3 and from ( ⁇ ) at least one aliphatic C 3 -C 6 olefin homo- or copolymers,
• I at least one low density polyethylene in the range of 0.915 to 0.935 g / cm 3 and
• thermoplastic polymer selected from the group comprising polystyrenes and styrene copolymers
• a layer (c) composed of at least one low density polyethylene in the range 0.915 to 0.935 g / cm 3 or a mixture of (a) at least one lower density polyethylene in the range 0.915 to 0.935 g / cm 3 and ( ⁇ ) at least one aliphatic C3-Ce olefin homo- or copolymers,
• CONFIRMATION COPY characterized in that the tear propagation force of the multi-layer film both in the machine direction and transversely to the machine direction is at most 1000 mN, determined at a total film thickness of 50 pm according to the Elmendorf test according to DIN EN ISO 6383-2.
• Packaging of the film is specified for packaging.
• Multi-layer films often unsuitable mechanical properties such as too low puncture resistance and an insufficiently linear on and
• multi-layer films which are used as material for packaging such as disposable packaging, should have as continuous as possible linear tear and tear propagation behavior to avoid uncontrolled tearing and possibly caused thereby inappropriate access to the packaged goods.
• the highest possible puncture resistance of the packaging material is advantageous in order to facilitate the handling of the packaging produced from the multilayer films. This is especially true because the packaged with the multi-layer films are usually stacked or stacked during storage and transportation and the packaging can be accidentally punctured. This increases the number of
• the object of the present invention was therefore to provide a multilayer film for
• Puncture resistance as well as by a straight, linear crack on opening, with as few deviations as possible.
• a layer (a) composed of at least one low density polyethylene in the range of 0.915 to 0.935 g / cm 3 or a blend of (a) at least one lower density polyethylene in the range of 0.915 to 0.935 g / cm 3 and ( ⁇ ) at least one aliphatic C 3 -C 6 olefin homo- or copolymers, (b) a layer (b) composed of a mixture of
• I at least one low density polyethylene in the range of 0.915 to 0.935 g / cm 3 and
• thermoplastic polymer selected from the group comprising polystyrenes and styrene copolymers
• a layer (c) composed of at least one low density polyethylene in the range 0.915 to 0.935 g / cm 3 or a mixture of (a) at least one lower density polyethylene in the range 0.915 to 0.935 g / cm 3 and ( ⁇ ) at least one aliphatic C 3 -C 6 olefin homo- or copolymers, characterized in that the tear propagation force of the multilayer film both in the machine direction and transversely to the machine direction at most 1000 mN, determined at a total film thickness of 50 ⁇ according to the Elmendorf test according to DIN EN ISO 6383-2, is dissolved.
• layer sequence in the sense of the invention means that the layers a), b) and c) are present in the listed order and are present directly adjacent to one another. Additional layers may optionally be present on at least one surface of the layer sequence.
• low density polyethylene within the meaning of the invention is synonymous with “low density polyethylene” and "LDPE", ie with this Term is called unfoamed low density polyethylene, which is characterized by a high degree of branching of the molecules.
• machine direction is inventively the
• Production direction in which the multilayer film is produced and possibly rolled up and the term "transverse to the machine direction” is understood to mean the direction at right angles to the production direction of the multilayer film.
• multi-layer film in the machine direction and transverse to the machine direction at most 800 mN determined at a total film thickness of 50 mm according to the Elmendorf test according to DIN EN ISO 6383-2.
• the multilayer film according to the invention preferably has a ratio of the tear propagation force in the machine direction to the tear propagation force transversely to the machine direction of 2: 1 to 1: 2, preferably 1: 5: 1 to 1: 1, 5, determined at
• Puncture resistance preferably of at least 30 N, more preferably of at least 40 N, determined at a total film thickness of 50 ⁇ m according to ASTM E 154-88 part 10, from.
• the polyethylene of layers (a), (b) and (c) each have a density in the range of 0.920 to 0.935 g / cm 3 .
• the melting temperature of the polyethylene of the layers (a), (b) and (c) is at most 1 18 ° C, more preferably at most 1 16 ° C, determined according to DIN EN ISO 3146.
• Both the layer (a) and the layer (c) may be, identically or differently, selected from a mixture (a) of at least one lower density polyethylene in the range 0.915 to 0.935 g / cm 3 , preferably 0.920 to 0.935 g / cm 3 , and from ( ⁇ ) at least one aliphatic C 3 - Ce olefin homo- or copolymers, preferably at least one propylene homo- or copolymers, more preferably a polypropylene and / or propylene copolymers, as the polymer components of the respective layer be constructed.
• the polymer mixture of (a) and ( ⁇ ) preferably consists of at least 50% by weight, more preferably at least 70% by weight up to 95% by weight, based in each case on the total weight of the polymer mixture (a) and ( ⁇ ) of the
• Polyethylene component (a) Polyethylene component (a).
• At least one of the layers (a) and (c) is a surface layer of the multilayer film according to the invention and preferably heat-sealable.
• the layers (a) and (c) may be the same or different, preferably the same.
• Multilayer film preferably has a layer thickness of from 5 ⁇ m to 75 ⁇ m, more preferably from 10 ⁇ m to 50 ⁇ m, particularly preferably from 15 ⁇ m to 25 ⁇ m.
• the layer (a) and the layer (c) have an identical layer structure, preferably an identical layer thickness and / or an identical layer
• composition of the polymer component or polymer components Composition of the polymer component or polymer components.
• the layer (b) of the multilayer film according to the invention is based on a mixture
• thermoplastic polymer selected from the group comprising polystyrenes and styrene copolymers.
• polystyrenes Preferably used as polymer component II are polystyrenes, copolymers of styrene / acrylonitrile, copolymers of styrene / butadiene, copolymers of
• Styrene / (meth) acrylate copolymers of styrene / acrylonitrile / (meth) acrylates, copolymers of styrene / acrylonitrile / butadienes, more preferably at least one polystyrene.
• the polymer component II has a
• Glass transition temperature T g of at least 60 ° C, preferably at least 80 ° C and most preferably at least 90 ° C, determined according to ISO 11357-1, -2, -3 (DSC).
• the proportion of styrene in the styrene copolymers of layer (b) is preferably at least 40% by weight, particularly preferably at least 50% by weight, based on the total weight of the styrene copolymer.
• the proportion of the polymer component II in the layer (b) is at most 50% by weight, preferably at most
• the layer (b) preferably has a layer thickness of 5 ⁇ m to 100 ⁇ m, more preferably 10 ⁇ m to 50 ⁇ m, very particularly preferably 15 ⁇ m to 30 ⁇ m.
• the layer thickness of the layer (b) is preferably at least 20%, particularly preferably 25-75%, based on the total thickness of the layer sequence (a) - (c).
• the total thickness of the layer sequence (a) - (c) is at least 30%, more preferably 50% to 100%, based on the total thickness of
• the preparation of the multilayer film according to the invention can be carried out by any manufacturing method, such.
• Example by lamination, extrusion, preferably by co-extrusion, very particularly preferably by blown film co-extrusion.
• the multilayer film according to the invention can be produced and processed as respective individual layers, as a partial composite or as an entire multilayer film in the form of a tubular film.
• At least the layer sequence (a) - (c) is produced in the form of a preferably coextruded film tube.
• the coextruded layer sequence (a) - (c) may preferably have a blow-up ratio of at least 1: 1, particularly preferably of at least 1.5: 1, very particularly preferably of at least 2: 1.
• the multilayer film can also be produced as a laminate comprising the coextruded layer sequence (a) - (c) and optionally at least one further layer.
• a barrier layer (d) and / or a layer (s) based on at least one thermoplastic polymer may be present as a carrier layer, wherein the barrier layer is optionally connected to the remaining layers of the film composite via an adhesion promoter layer.
• the entire multilayer film is present in the form of a preferably coextruded film tube, which can optionally be processed into a flattened film.
• the multilayer film according to the invention is particularly preferred as a
• Multi-layer blown film preferably by extrusion, in particular produced by blown film coextrusion.
• the multilayer film can be made and processed partially or in total as a cast film.
• the multilayer film produced as a cast film is at least monoaxially stretched in a draw ratio of at least 1: 1.5, more preferably at least 1: 2, more preferably 1: 2 to 1: 4.
• Multilayer film monoaxially in the longitudinal direction in a draw ratio of
• Cast film produced multilayer film a ratio of longitudinal to transverse stretching of preferably at least 1: 1, more preferably at least 1, 1: 1 and most preferably at least 1, 2: 1 on.
• the extruded films can thus be stretched to the necessary extent during production or preferably immediately after extrusion.
• an adhesion promoter layer may be necessary for the further construction of the multilayer film.
• This can, for example, as a melt or as a liquid preparation, for example as a solution or Dispersion, by conventional methods such as spraying or casting on one of the layers to be joined according to the invention for use
• Multilayer film e.g. applied to the layer (c) and connected to one of the further layers.
• the adhesion promoter layer can also be applied to the layer (c) by extrusion and bonded directly to another layer, such as a barrier layer or a layer composite.
• the multilayer film according to the invention may contain further layers in addition to the layer sequence (a) - (c). Depending on the nature of these layers, they can be coextruded with the layer sequence (a) - (c) or on the
• the multilayer film according to the invention may have a barrier layer (d).
• this barrier layer (d) serves as a gas barrier layer, particularly preferably an oxygen barrier layer and / or a water vapor barrier layer.
• the barrier layer (d) may preferably be based on at least one ethylene-vinyl alcohol copolymer, at least one polyvinyl alcohol, at least one metal, preferably aluminum, or at least one metal oxide, preferably SiOx or alumina, which metal may be present as a film or vapor-deposited as a metal oxide ,
• the barrier layer (d) may be based on an ethylene-vinyl alcohol copolymer (EVOH) which is prepared by essentially complete hydrolysis of a speaking ethylene-containing polyvinyl acetate (EVAc) was obtained.
• EVOH ethylene-vinyl alcohol copolymer
• EVAc ethylene-containing polyvinyl acetate
• These fully hydrolyzed ethylene-containing polyvinyl acetates have a saponification degree> 98% and an ethylene content of 0.01-80 mol%, preferably 1-50 mol%.
• the barrier layer (d) may also be based on a polyvinyl alcohol obtained by substantially complete hydrolysis of a polyvinyl acetate (PVA) and having a saponification degree> 98% as fully saponified polyvinyl acetate.
• PVA polyvinyl acetate
• barrier layer (d) is preferably made of aluminum which has been vapor-deposited.
• the barrier layer (d) preferably has a layer thickness of 1 .mu.m to 100 .mu.m, preferably from 2 .mu.m to 80 .mu.m, particularly preferably from 3 .mu.m to 60 .mu.m, very particularly preferably from 4 .mu.m to 40 .mu.m, the layer thickness of a vapor-deposited metal or metal oxides in the A range.
• the multilayer film according to the invention may optionally have a layer (s) based on at least one thermoplastic polymer as a carrier layer.
• thermoplastic polymers selected from the group comprising polyolefins, polyamides, polyesters,
• the multilayer film according to the invention may optionally have on at least one of its surfaces a release layer, preferably based on at least one cured polysiloxane, preferably if not as
• Packaging material is used.
• the multilayer film according to the invention may optionally also have a release layer on both surfaces, preferably based on at least one cured polysiloxane, if the multilayer film may not serve as packaging material.
• a polysiloxane is based on n recurring siloxane units (- [Si (R2) -O] -) n , which are each independently disubstituted with two organic radicals R, where R is preferably each R 1 or OR 1 and R 1 is each represents an alkyl radical or an aryl radical.
• the cured polysiloxane according to the invention is preferably based on a recurring dialkylsiloxane unit or on a recurring alkylaryl-siloxane unit.
• these units can be in terminal monofunctional siloxanes (M) with a Si-O bond, difunctional siloxanes (D) with distinguish two Si-O bonds, trifunctional siloxanes (T) with three Si-O bonds, and tetrafunctional siloxanes (Q) with four Si-O bonds.
• the polysiloxane used according to the invention preferably has a crosslinked ring-shaped or chain-like, particularly preferably a crosslinked, chain-like structure which is characterized by (D), (T, and / or (Q) units linked to a two- or three-dimensional network.
• the number n of repeating siloxane units [Si (R2) -O] -) n in the polysiloxane chain is referred to as the degree of polymerization of the polysiloxane.
• the optional release layer is preferably based on at least one cured, i. crosslinked polysiloxane selected from the group comprising addition-crosslinked, preferably metail-catalyzed addition-crosslinked,
• condensation-crosslinked, radically crosslinked, cationically crosslinked and / or crosslinked by exposure to moisture polysiloxanes are condensation-crosslinked, radically crosslinked, cationically crosslinked and / or crosslinked by exposure to moisture polysiloxanes.
• the release layer is based on at least one cured polysiloxane, which by thermal curing, by curing with
• Electromagnetic radiation preferably by UV radiation, or cured by exposure to moisture.
• the release layer of the multilayer film according to the invention is preferably based on at least one cured polysiloxane selected from the group comprising polydialkylsiloxanes,
• polydimethylsiloxanes preferably polydimethylsiloxanes, and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes, which have been cured by UV radiation.
• the optionally present release layer of the multilayer film according to the invention preferably has a layer thickness of from 0.1 ⁇ m to ⁇ 3 ⁇ m, preferably from 0.2 ⁇ m to 1.5 ⁇ m.
• Barrier layer (d), carrier layer (s), and the optionally present adhesion promoter layers of the stated polymer components can, if necessary, each independently with additives selected from the group consisting of antioxidants, antiblocking agents, antifog agents, antistatic agents, antimicrobial agents, 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), process aids, flame retardants,
• HALS sterically hindered amine
• Flexibilizers sealants, plasticizers, silanes, spacers, fillers, peel additives, waxes, wetting agents, surface-active compounds, preferably surfactants, and dispersants.
• the tear propagation behavior of the multilayer film according to the invention is not impaired by the addition of additives or their amount.
• the layer (a), the layer (b), the layer (c) and the optionally present layers (d) and (e) and the optionally present adhesion promoter layers each independently, at least 0.01-30 wt. -%, preferably at least 0.1-20 wt .-%, each based on the total weight of a single layer, at least one of the aforementioned additives.
• the additives can be incorporated in the form of a master batch in polyolefins or olefin copolymers in the respective layer.
• the multilayer film of the invention may be printed and / or colored and / or embossed.
• the multilayer film according to the invention may optionally be provided with an adhesive layer on at least one of its surfaces.
• Suitable adhesives of the adhesive layer are, for example, pressure-sensitive adhesives based on acrylates, natural rubbers, styrene-isoprene-styrene block copolymers and silicone-based adhesives, such as. B. polydimethylsiloxane and
• the multilayer film according to the invention is preferably suitable as
• Another object of the invention is therefore the use of a
• inventive multilayer film as a packaging material.
• Another object of the invention is therefore the use of a
• inventive multilayer film for producing a packaging element is provided.
• the multilayer film according to the invention is particularly suitable for producing a packaging element and / or a packaging, preferably a bag packaging, a single-portion packaging, a sachet or a stickpack.
• Another object of the invention is therefore the use of a
• Another object of the invention is therefore a package in the form of a bag packaging, a single-portion packaging, a sachet or a
• the multilayer film according to the invention is preferably used for the production of easy-to-open packages.
• Another object of the invention is therefore an easy-to-open packaging of a multilayer film according to the invention. From such a package, the packaged Good can be easily removed, as it is the up and
• the multilayer film according to the invention is preferably suitable for producing an easy-to-open packaging element, for. B. as a lid of a two-piece packaging.
• a two-part packaging according to the invention comprises the lid of a multilayer film according to the invention and a container, which is preferably formed as a trough of thermoformed plastic.
• Another object of the invention is therefore an easy-open
• Packaging element preferably a lid, from the inventive
• a packaging according to the invention is characterized in that it has a light and straight, linear tear propagation behavior, regardless of the direction of production the used multilayer film according to the invention shows, ie both in the machine direction and across it, and thus easy to open.
• a notch or weakening can be attached. If a notch or weakening is applied, it should preferably be in the tear seam area in the tear seam area.
• the packaging according to the invention is further characterized by having a high puncture resistance, which makes it easier to handle, i. that it is less likely to be damaged by impact during storage, transport and sale compared to films with similar tear propagation behavior.
• a multilayer film according to the invention is also suitable as a release film.
• Another object of the invention is therefore the use of a
• inventive multilayer film as a release film, in particular with a
• the multilayer film according to the invention is particularly suitable because of their tear or tear propagation as a release and protective film.
• the multilayer film according to the invention can be used as a protective and release film for adhesive tapes.
• Another object of the invention is therefore the use of a
• multilayer film of the invention as a protective and release film for adhesive tapes.
• the tear propagation strength (tear propagation resistance) in the machine direction (MD) and transversely to the machine direction (CD) of a multilayer film according to the invention having a specific total film thickness is determined in each case according to the Elmendorf method according to ISO 6383-2 and specified in [mN].
• the puncture resistance of a multilayer film of the present invention having a certain total film thickness is determined according to ASTM E 154-88 part 10 and reported in [N].
• the multilayer film is measured by measuring the deviation from a straight, linear course during tearing (further tearing). This is stated in [mm].
• Total film thickness whose tear propagation behavior is to be determined respectively 10 specimens are cut to have a length of 100 mm parallel to the machine direction (MD) and a width of 50 mm in the cross-machine direction (CD). Further, 10 samples are cut to have a length of 100 mm in the cross machine direction (CD) and a width of 50 mm parallel to the machine direction (MD).
• the individual samples are each cut in the middle of the broad side straight and 50 mm parallel to the longitudinal side and below the incision in the middle and parallel to the longitudinal side with a double-sided adhesive tape with a width of 20 mm and a length of 90 mm.
• a linear extension line of the incision is painted, which serves as a straight, linear tear line for measuring the deviation.
• the determination of the tear behavior of the individual samples is carried out under normal conditions (DIN 50014-23 / 50-2).
• one leg of the individual samples is fixed in each case by means of the glued double-sided adhesive tape at a defined angle of 45 ° C [ß] on a metal rail with a width of 100 mm and a length of 350 mm.
• the metal rail is inserted into the bottom tension clamp of an electronic
• the incised end of the unfixed leg (“the unfixed trouser leg") of the individual specimens is fixed by means of a double-sided adhesive tape to a stiff film strip of approx. 400 mm length and this is clamped in the upper tensioning clamp of the tearing device.
• the two legs of the individual samples are then pulled apart at an angle of 175 ° and at a speed of 500 mm / min until the sample is completely divided.
• the maximum deviation A of the crack in mm from the marking line (straight, linear crack in extension of the incision) at the end of the sample is determined.
• the mean value is also formed. This serves to assess the linear tear behavior in the cross-machine direction (CD).
• Lupolen 2420 F LDPE from Basell; Density (ISO 1183): 0.927 g / cm 3 ;
• Innovex LL 0209 AA LLDPE from Ineos; contains 1-butene as a comonomer;
• Polystyrene 1340 polystyrene from Total Petrochemicals; Density (ISO)
• Styrolux 3 G 55 styrene-butadiene block copolymer from BASF; density
• the film consists of a layer and has a total thickness of 50 ⁇ m.
• the film consists of three layers, and each has a total thickness of 50 pm.
• the layer thickness ratios are 1: 2: 1.
• the individual layers of the multilayer film V1 or B1 adjoin each other directly in the order given below.
• the films V1, V2 and B1 were each made by blown film coextrusion. The blow up ratio was 2: 1 in each case.
• the tear strength (Elmendorf) in the machine direction (MD) and crosswise to the machine direction (CD) and the puncture resistance and the deviation from the straight, linear crack when tearing further in the machine direction (MD) and transversely to the machine direction (CD) determined in each case a total film thickness of 50 ⁇ .

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Laminated Bodies (AREA)
• Wrappers (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=48444312

Family Applications (1)

Country Status (7)

Families Citing this family (2)

Family Cites Families (19)

• 2013
  • 2013-04-25 JP JP2016509301A patent/JP6205483B2/ja not_active Expired - Fee Related
  • 2013-04-25 BR BR112015026147A patent/BR112015026147A2/pt not_active Application Discontinuation
  • 2013-04-25 CA CA2907849A patent/CA2907849C/en not_active Expired - Fee Related
  • 2013-04-25 EP EP13722677.5A patent/EP2988933A1/de not_active Withdrawn
  • 2013-04-25 RU RU2015150250A patent/RU2664104C2/ru active
  • 2013-04-25 WO PCT/EP2013/001242 patent/WO2014173423A1/de active Application Filing
• 2014
  • 2014-04-25 WO PCT/EP2014/001106 patent/WO2014173544A1/de active Application Filing
• 2015
  • 2015-09-29 US US14/869,105 patent/US20160016392A1/en not_active Abandoned

Non-Patent Citations (2)

Also Published As

Similar Documents

Legal Events