EP0140711A2
Expired / Lapsed
EP
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Heat-shrinkable laminate film
Assignee: Kureha Corp
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Filing: 1984-10-31
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Granted: —
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Expires: 2004-10-31
Abstract
Abstract Disclosed herein is a heat-shrinkable laminate film comprising outer layers of a polyolefine, a gas-barrier layer of a copolymer of vinylidene chloride, at least one intermediate layer of an ionomer and adhesive layers disposed between any of the above layers, the total thickness of the intermediate layer(s) of an ionomer being 5 to 20% of the total thickness of the heat-shrinkable laminate film. The heat-shrinkable laminate film is particularly useful in packaging foodstuffs.
Inventors
- 👤 Masaki Ohya
- 👤 Yoshiharu Nishimoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 06:34
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/30; B32B27/06; B32B27/08; B32B1/00; B32B1/08; B32B27/304; B32B27/32; B32B27/322; B32B7/00; B32B7/04; B32B7/12; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/732; B32B2307/734; B32B2307/736; B32B2323/00; B32B2323/04; B32B2323/046; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
60 words
A heat-shrinkable laminate film comprising outer layers of a polyolefin, a gas-barrier layer of a copolymer of vinylidene chloride, at least one intermediate layer of an ionomer and adhesive layers disposed between any of the above layers, the total thickness of the intermediate layer(s) of an ionomer being 5 to 20% of the total thickness of the heat-shrinkable laminate film.
Claim 2
Dependent Claim
60 words
A heat-shrinkable laminate film comprising outer layers of a polyolefin, a gas-barrier layer of a copolymer of vinylidene chloride, at least one intermediate layer of an ionomer and adhesive layers disposed between any of the above layers, the total thickness of the intermediate layer(s) of an ionomer being 5 to 20% of the total thickness of the heat-shrinkable laminate film.
Claim 3
Dependent Claim
37 words
A heat-shrinkable laminate film according to claim 1, wherein at least one of the outer layers is a copolymer of ethylene and vinyl acetate of a crystal melting point in a range of from 80 to 103°C.
Claim 4
Dependent Claim
77 words
A heat-shrinkable laminate film according to claim 2, wherein one of the outer layers is a linear, low density polyethylene of a crystal melting point in a range of from 110 to 130°C or a mixture of not more than 40% by weight of the linear, low density polyethylene and not less than 60% by weight of a copolymer of ethylene and vinyl acetate of a crystal melting point in a range of from 80 to 103°C.
Claim 5
Dependent Claim
71 words
A heat-shrinkable laminate film according to claim 1, wherein each of the outer layers is a mixture of not more than 40% by weight of a linear, low density polyethylene of a crystal melting point in a range of from 110 to 130°C and not less than 60% by weight of a copolymer of ethylene and vinyl acetate of a crystal melting point in a range of from 80 to 103°C.
Claim 6
Dependent Claim
32 words
A heat-shrinkable laminate film according to claim 2 wherein both outer layers are of a copolymer of ethylene and vinyl acetate of a crystal melting point in the range 80 to 103°C.
Claim 7
Dependent Claim
118 words
A heat-shrinkable laminate film according to any one of the preceding claims, wherein the total thickness of the heat-shrinkable laminate film is in the range of from 20 to 120 micrometers, the thickness of the gas-barrier layer is more than 2 µm and not more than 30% of the total thickness of the heat-shrinkable laminate film, the thickness of the outer layers is in the range of 35 to 92% of the total thickness of the heat-shrinkable laminate film, the thickness of the intermediate layer(s) of ionomer is in the range of 5 to 20% of the total thickness of the heat-shrinkable laminate film, and the thickness of each of the adhesive layers is 0.5 to 3.0 pm.
Claim 8
Dependent Claim
24 words
A heat-shrinkable laminate film according to any one of the preceding claims, wherein the heat-shrinkable laminate film is formed as a flat sheet form.
Claim 9
Dependent Claim
23 words
A heat-shrinkable laminate film according to any one of claims 1 to 6, wherein the heat-shrinkable laminate film is produced in tubular form.
References Cited (Backward Citations)
US4226822A
Cited
EP0032027A2
Cited
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