EP0236099A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Oxygen barrier packaging film
Assignee: Cryovac LLC
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Filing: 1987-02-27
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Granted: —
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Expires: 2007-02-27
Abstract
Abstract A multilayer film comprises, (a) an ethylene vinyl alcohol copolymer core layer; (b) two outer layers of (blend of) polymeric materials; (c) two interior layers of an adhesive comprising an (acid) anhydride-modified polyolefin, to bond (b) to (a) or to (d) when present; and (d) opt. two polyamide layers each adhering to opposite surfaces of the core layer. Mfr. of the film is also claimed.
Inventors
- 👤 Ennis M. Fant
- 👤 Gautam P. Shah
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 01:29
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/16; B29C48/18; B29C48/185; B32B27/30; B32B27/306; B32B27/32; B32B27/34; B32B38/00; B32B38/0012; B32B38/0036; B32B7/00; B32B7/04; B32B7/12; B32B2038/0028; B32B2038/0052; B32B2038/0076; B32B2250/00; B32B2250/24; B32B2250/246; B32B2250/40; B32B2270/00; B32B2305/00; B32B2305/72; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2307/70; B32B2307/718; B32B2323/00; B32B2323/04; B32B2323/046; B32B2439/00; B32B2439/70
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
88 words
A multilayer film comprising: a) a core layer comprising an ethylene vinyl alcohol copolymer; b) two outer layers each comprising a polymeric material or blend of polymeric materials; c) two interior layers each comprising an adhesive polymeric material to bond the outer layers (b) to the core layer (a) or to the intermediate polyamide-containing layers (d) when present, said adhesive polymeric material comprising an acid- or acid anhydride-modified polyolefin; and d) optionally, two layers each adhering to opposite respective surfaces of the core layer, and comprising a polyamide.
Claim 2
Dependent Claim
88 words
A multilayer film comprising: a) a core layer comprising an ethylene vinyl alcohol copolymer; b) two outer layers each comprising a polymeric material or blend of polymeric materials; c) two interior layers each comprising an adhesive polymeric material to bond the outer layers (b) to the core layer (a) or to the intermediate polyamide-containing layers (d) when present, said adhesive polymeric material comprising an acid- or acid anhydride-modified polyolefin; and d) optionally, two layers each adhering to opposite respective surfaces of the core layer, and comprising a polyamide.
Claim 3
Dependent Claim
19 words
A multilayer film according to claim 1 wherein the outer layers (b) each comprise a linear low density polyethylene.
Claim 4
Dependent Claim
30 words
A multilayer film according to claim 1 wherein the outer layers (b) each comprise a blend of linear low density polyethylene, linear medium density polyethylene, and ethylene vinyl acetate copolymer.
Claim 5
Dependent Claim
26 words
A multilayer film according to claim 1 wherein the outer layers (b) each comprise a blend of linear low density polyethylene and very low density polyethylene.
Claim 6
Dependent Claim
23 words
A multilayer film according to claim 1 wherein the outer layers (b) each comprise polypropylene, an ethylene propylene copolymer, or a blend thereof.
Claim 7
Independent Claim
98 words
A method of making a multilayer film comprising the steps of: a) coextruding a core layer comprising an ethylene vinyl alcohol copolymer, two outer layers each comprising a polymeric material or blend of polymeric materials, two interior layers each comprising an adhesive polymeric material to bond the outer layers to the core layer or to the intermediate polyamide-containing layers wnen present, said adhesive polymeric material comprising an acid- or acid anhydride-modified polyolefin; and optionally, two polyamide layers each adhering to opposite respective surfaces of the core layer; b) cooling the coextruded film; and c) collapsing the cooled film.
Claim 8
Independent Claim
98 words
A method of making a multilayer film comprising the steps of: a) coextruding a core layer comprising an ethylene vinyl alcohol copolymer, two outer layers each comprising a polymeric material or blend of polymeric materials, two interior layers each comprising an adhesive polymeric material to bond the outer layers to the core layer or to the intermediate polyamide-containing layers wnen present, said adhesive polymeric material comprising an acid- or acid anhydride-modified polyolefin; and optionally, two polyamide layers each adhering to opposite respective surfaces of the core layer; b) cooling the coextruded film; and c) collapsing the cooled film.
Claim 9
Dependent Claim
24 words
The method according to claim 6 further comprising heating the collapsed film to its orientation temperature range, and stretching and orienting the heated film.
Claim 10
Dependent Claim
21 words
The method according to claim 7 further comprising cross-linking the collapsed film prior to heating the film to its orientation temperature.
Claim 11
Dependent Claim
17 words
The method according to claim 8 wherein the cross-linking is accomplished by irradiation of the collapsed film.
References Cited (Backward Citations)
No citation records indexed.
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