EP0118060B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Multilayered sheet with a layer impermeable to gases and aromas, process for its production and its use
Assignee: Hoechst AG
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Filing: 1984-02-14
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Granted: 1987-08-19
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Expires: 2004-02-14
Abstract
No abstract record available.
Inventors
- 👤 Hermann Dr. Dallmann
- 👤 Hans Josef Dr. Palmen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 09:47
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/30; B32B27/306; B32B27/32; B32B27/34; B32B38/00; B32B38/0012; B32B2038/0028; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2553/00; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
185 words
A multilayered, preferably sealable film which comprises one or several inner layers comprising an inner barrier layer D based on a saponified ethylene/vinyl acetate copolymer which contains 15 to 60 mole % of ethylene units and is saponified to at least 90 %, and layers which are immediately adjacent to each of the two surfaces of said barrier layer D, said adjacent layers being adhesion-promoting layers C consisting of a modified polyolefin or a partially saponified ethylenelvinyl alcohol copolymer having a low degree of saponification or containing a mixture of these components, said multilayered film being characterized in that on one surface of the barrier layer D there is applied a first layer B on top of the first adhesion-promoting layer C and an optional sealable layer A is applied on top of said layer B, said layer B comprising a homopolymer and/or copolymer of propylene and/or the material of said layer C and/or optionally the material of said layer A, and in that said layers B to D and optionally also A of said film are at the same time oriented at least biaxially.
Claim 2
Dependent Claim
185 words
A multilayered, preferably sealable film which comprises one or several inner layers comprising an inner barrier layer D based on a saponified ethylene/vinyl acetate copolymer which contains 15 to 60 mole % of ethylene units and is saponified to at least 90 %, and layers which are immediately adjacent to each of the two surfaces of said barrier layer D, said adjacent layers being adhesion-promoting layers C consisting of a modified polyolefin or a partially saponified ethylenelvinyl alcohol copolymer having a low degree of saponification or containing a mixture of these components, said multilayered film being characterized in that on one surface of the barrier layer D there is applied a first layer B on top of the first adhesion-promoting layer C and an optional sealable layer A is applied on top of said layer B, said layer B comprising a homopolymer and/or copolymer of propylene and/or the material of said layer C and/or optionally the material of said layer A, and in that said layers B to D and optionally also A of said film are at the same time oriented at least biaxially.
Claim 3
Dependent Claim
55 words
The film as claimed in claim 1, wherein said first layer B and said optionally present outer layer A and/or said first layer C comprise a single layer comprised of a blend of the polymers of said first layer B and the polymers of said layer A and/or the polymers of said first layer C.
Claim 4
Dependent Claim
42 words
The film as claimed in claim 1, wherein said first layer B and said optionally present layer A and/or said first layer C comprise a single layer comprised of the polymers of said layer A and/or the polymers of said layer C.
Claim 5
Dependent Claim
49 words
The film as claimed in any of claims 1 to 3, wherein a second layer B is present on the opposite surface of said barrier layer D and on said adjacent second adhesion-promoting layer C, and another seaiable outer layer A is optionally present on said second layer B.
Claim 6
Dependent Claim
56 words
The film as claimed in claim 4 wherein said second layer B and said optionally present adjacent layer A and/or said adjacent second layer C comprise a single layer comprised of a mixture of the polymers of said layer B and of the polymers of said layer A and/or of the polymers of said layer C.
Claim 7
Dependent Claim
40 words
The film as claimed in any of claims 1 to 3, wherein another sealable outer layer A is optionally present on the opposite surface of said barrier layer D and is applied directly onto said adjacent second adhesion-promoting layer C.
Claim 8
Dependent Claim
42 words
The film as claimed in any of claims 1 to 6, wherein said barrier layer D comprises a mixture of an ethylene-vinyl alcohol copolymer and about 0.5 to about 50 % by weight of a carbonyl-containing polymer, preferably a polyamide or copolyamide.
Claim 9
Dependent Claim
19 words
The film as claimed in claim 7, wherein said copolyamide has a melting point of less than 210 °C.
Claim 10
Dependent Claim
30 words
The film as claimed in any of claims 1 to 8, wherein said barrier layer D is comprised of a mixture including hydroxyl-group-containing oligomers or polymers, in particular neopentyl glycol.
Claim 11
Dependent Claim
36 words
The film as claimed in any of claims 1 to 9, wherein the modified polyolefin of said adhesionpromoting layer C is a graft polymer which is optionally present in admixture with one or several thermoplastic polymers.
Claim 12
Dependent Claim
19 words
The film as claimed in any of claims 1 to 10, wherein said layer B comprises low-molecular, miscible resins.
Claim 13
Dependent Claim
45 words
The film as claimed in any of claims 1 to 11, wherein said layer B comprises finely distributed, solid, particularly inorganic, particles which preferably have a size of 0.2 to 20 µm and are present in an amount of 1 to 25 % by weight.
Claim 14
Dependent Claim
62 words
The film as claimed in any of claims 1 to 12, wherein said optionally present layer A comprises a homo- or copolymer of an a-olefin ; or a terpolymer composed of C 2 /C 3 /C n units, with n denoting 4 to 10 ; or a mixture of different polyolefins ; or ionomers ; or mixtures of ionomers and other polyolefins.
Claim 15
Dependent Claim
22 words
The film as claimed in any of claims 1 to 13, wherein said optionally present layer(s) A include(s) a further thermoplastic polymer.
Claim 16
Dependent Claim
29 words
The film as claimed in any of claims 1 to 14, wherein said optionally present layer(s) A inciude(s) additives, such as slip agents, lubricants, antiblocking agents or antistatic agents.
Claim 17
Dependent Claim
77 words
The film as claimed in any of claims 1 to 5, wherein a further layer is applied by pressure to at least a portion of at least one outer surface of said film, said layer applied by pressure being bonded to the outer surface of said film optionally by means of an adhesion-promoting agent and being sealable to itself and to other sealable layers on a basis of polyolefin, preferably at temperatures of less than 100 °C.
Claim 18
Dependent Claim
22 words
The film as claimed in claim 16, wherein said layer applied by pressure comprises an ethylene/vinyl acetate copolymer as its principal component.
Claim 19
Dependent Claim
24 words
The film as claimed in claim 16 or 17, wherein said layer applied by pressure is pressure-sealable to itself and preferably comprises natural rubber.
Claim 20
Dependent Claim
43 words
The film as claimed in claim 16, wherein the layer applied by pressure is present on said second adhesion-promoting layer C or said second layer B, which are applied to the opposite surface of said barrier layer D, as claimed in claim 4.
Claim 21
Dependent Claim
32 words
The film as claimed in any of claims 1 to 19, wherein said barrier layer D comprises two or more super-imposed individual layers, with adhesion-promoting layers being applied between said individual layers.
Claim 22
Dependent Claim
74 words
A process for manufacturing the film as claimed in any of claims 1 to 20, wherein the melt of the polymer or polymer blend forming the barrier layer and the melts of the other polymers required to form the composite material are extruded jointly and simultaneously through a slot die, the resulting flat sheet material is cooled down, oriented by simultaneous or subsequent stretching in the longitudinal and transverse directions, and is optionally heat-set.
Claim 23
Dependent Claim
21 words
The process as claimed in claim 21, wherein stretching is performed within a temperature range of 100 °C to 170 °C.
Claim 24
Dependent Claim
46 words
The process as claimed in claim 21 or 22, wherein the stretching step is followed by a heat- treatment performed at a temperature between 100 °C and a temperature below the melting point of the material forming said layer D and, if present, said layer B.
Claim 25
Dependent Claim
40 words
The process as claimed in any of claims 21 to 23, wherein, following the stretching step in the longitudinal and transverse directions and prior to the heat-setting step, the film is subjected to a stretching step in the longitudinal direction.
Claim 26
Dependent Claim
36 words
The process as claimed in any of claims 21 to 24, wherein a sealing layer is applied from a solution or dispersion to at least one surface of said biaxially or multiaxially stretched and heat-set film.
Claim 27
Dependent Claim
28 words
The process as claimed in claim 25, wherein said sealing layer is anchored on said biaxially or multiaxially stretched and heat-set film by means of an adhesion-promoting agent.
Claim 28
Dependent Claim
25 words
Use of the film as claimed in any of claims 1 to 20 as a packaging film, especially for goods which are sensitive to oxygen.
References Cited (Backward Citations)
No citation records indexed.
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