EP0277839A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Heat-shrinkable laminated film and process for producing the same
Assignee: Kureha Corp
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Filing: 1988-02-05
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Granted: —
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Expires: 2008-02-05
Abstract
Abstract Disclosed herein is a heat-shrinkable laminated film comprising at least two layers of a mixed resin layer (A) consisting essentially of 65 to 85 wt% of a polyamide resin and 15 to 35 wt% of a saponified ethylene-vinyl acetate copolymer, and a layer (B) containing at least 55 wt% of a saponified ethylene-vinyl acetate copolymer, the thickness of said layer (A) being larger than that of said layer (B).
Inventors
- 👤 Yoshiharu Nishimoto
- 👤 Kengo Yamazaki
- 👤 Tooru Oosugi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 23:24
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/306; B32B27/32; C; C08; C08L; C08L29/00; C08L29/02; C08L29/04; B32B2270/00; B32B2307/00; B32B2307/70; B32B2307/732; B32B2307/734; B32B2307/736; B32B2331/00; B32B2331/04; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/26; Y10T428/31504; Y10T428/31725; Y10T428/31736; Y10T428/31739; Y10T428/31743; Y10T428/3175; Y10T428/31757; Y10T428/31855; Y10T428/31909; Y10T428/31928
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
83 words
A heat-shrinkable laminated film comprising at least two layers including a layer (A) comprising a blend of polyamide resin and a saponified ethylene-vinyl acetate polymer characterised in that the blend comprises 65 to 85 wt% of a polyamide resin and 15 to 35 wt% of a saponified ethylene-vinyl acetate copolymer, and the laminate also includes a layer (B) containing at least 55 wt% of a saponified ethylene-vinyl acetate copolymer, the thickness of said layer (A) being larger than that of said layer (B).
Claim 2
Dependent Claim
83 words
A heat-shrinkable laminated film comprising at least two layers including a layer (A) comprising a blend of polyamide resin and a saponified ethylene-vinyl acetate polymer characterised in that the blend comprises 65 to 85 wt% of a polyamide resin and 15 to 35 wt% of a saponified ethylene-vinyl acetate copolymer, and the laminate also includes a layer (B) containing at least 55 wt% of a saponified ethylene-vinyl acetate copolymer, the thickness of said layer (A) being larger than that of said layer (B).
Claim 3
Dependent Claim
21 words
A heat-shrinkable laminated film according to claim 1, wherein said layer (B) is a layer of a saponified ethylene-vinyl acetate copolymer.
Claim 4
Dependent Claim
70 words
A heat-shrinkable laminated film according to claim 1, wherein said layer (B) is a mixed resin layer consisting essentially of not less than 55 wt% and less than 100 wt% of a saponified ethylene-vinyl acetate copolymer and more than O and not more than 45 wt% of at least one resin selected from the group consisting of a polyester elastomer, a polyamide elastomer, a polyolefin resin and a polyamide resin.
Claim 5
Dependent Claim
76 words
A heat-shrinkable laminated film according to claim 3, wherein the polyester elastomer is a block copolymer-type thermoplastic polyester elastomer, the polyamide elastomer is a polyester amide elastomer or polyether amide elastomer, the polyolefin resin is an ethylene-vinyl acetate copolymer or a saponified ethylene-vinyl acetate copolymer having a saponification degree of less than 95%, and the polyamide resin is nylon 6, nylon 11, nylon 12, nylon 6,9 , nylon 6,10, nylon 6,12, nylon 6-12 or nylon 6-66.
Claim 6
Dependent Claim
23 words
A heat-shrinkable laminated film according to claim 1, the polyamide resin is one of the crystalline melting point of not higher than 240°C.
Claim 7
Dependent Claim
30 words
A heat-shrinkable laminated film according to claim 5, the polyamide resin is nylon 6, nylon 11, nylon 12, nylon 6,9 , nylon 6,10, nylon 6,12, nylon 6-12 or nylon 6-66.
Claim 8
Dependent Claim
37 words
A heat-shrinkable laminated film according to claim 1, the ethylene content of the saponified ethylene-vinyl acetate copolymer is 25 to 49% and the saponification degree of the saponified ethylene-vinyl acetate copolymer is not less than 95 mol%.
Claim 9
Dependent Claim
28 words
A heat-shrinkable laminated film according to claim 1, the thickness of the layer (A) is 1, 2 to 3 times as large as that of the layer (B).
Claim 10
Dependent Claim
35 words
A heat-shrinkable laminated film according to claim 1, further comprising at least one olefin resin layer, and an adhesive layer disposed at least between said olefin layer and said layer (A) or said layer (B).
Claim 11
Dependent Claim
41 words
A heat-shrinkable laminated film according to claim 1 or 9, wherein the thickness of the layer (A) and the layer (B) is not more than 30 µm and a thickness in which the gas permeability is not more than 150 cc/m²·day·atm.
Claim 12
Dependent Claim
105 words
A heat-shrinkable laminated film according to claim 9, said olefin resin is a copolymer of ethylene and a vinyl ester monomer, a copolymer of ethylene and a monomer selected from the group consisting of an aliphatic unsaturated carboxylic acid and an aliphatic unsaturated carboxylate, a copolymer of ethylene and a monomer selected from the group consisting of acrylic acid, acrylate, methacrylic acid and methacrylate, an ionomer resin, a mixed resin of a linear low-density polyethylene and a copolymer of ethylene and vinyl acetate, a very low-density polyethylene, and a mixed resin of a very low-density polyethylene or a small amount of a linear low-density polyethylene.
Claim 13
Dependent Claim
20 words
A heat-shrinkable laminated film according to claim 9, said adhesive is a polyolefin modified or polymerized with a carboxylic acid.
Claim 14
Dependent Claim
33 words
A heat-shrinkable laminated film according to claim 9, the thickness of the laminated film is 15 to 120 µm and a thickness in which the gas permeability is not more than 150 cc/m²·day·atm.
Claim 15
Dependent Claim
113 words
A process for producing a heat-shrinkable laminated film comprising laminating at least two layers of a mixed resin layer (A) consisting essentially of 65 to 85 wt% of a polyamide resin and 15 to 35 wt% of a saponified ethylene-vinyl acetate copolymer, and a layer (B) containing at least 55 wt% of a saponified ethylene-vinyl acetate copolymer in a circular die so that the thickness of said layer (A) is larger than that of said layer (B); coextruding the laminate into a tubular shape; and biaxially stretching the tubular laminate to 1.3 to 3.5 times in the machine and transverse directions, respectively, while heating said laminate to 75°C and not higher than 100°C.
Claim 16
Dependent Claim
113 words
A process for producing a heat-shrinkable laminated film comprising laminating at least two layers of a mixed resin layer (A) consisting essentially of 65 to 85 wt% of a polyamide resin and 15 to 35 wt% of a saponified ethylene-vinyl acetate copolymer, and a layer (B) containing at least 55 wt% of a saponified ethylene-vinyl acetate copolymer in a circular die so that the thickness of said layer (A) is larger than that of said layer (B); coextruding the laminate into a tubular shape; and biaxially stretching the tubular laminate to 1.3 to 3.5 times in the machine and transverse directions, respectively, while heating said laminate to 75°C and not higher than 100°C.
References Cited (Backward Citations)
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