EP0270932A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Monolayer polyethylene shrink film
Assignee: EIDP Inc
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Filing: 1987-11-26
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Granted: —
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Expires: 2007-11-26
Abstract
Abstract This invention relates to a heat-shrinkable film consisting essentially of a blend of 99.5-98.5 weight % of linear low or medium density polyethylene and 0.5-1.5 weight % of one or more copolymers of ethylene with a monomer selected from vinyl acetate and acrylic acids or esters, where said film has been cross-linked to the degree induced by an irradiation dosage of about 1 to 5 megarads.
Inventors
- 👤 Richard Kenneth Roberts
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 12:47
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29C; B29C61/00; B29C61/003; B29C71/00; B29C71/04; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0844; B29C2035/085; B29C35/0866; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/0608; B29K2023/0633; B29K2023/08; B29K2023/083; B29K2105/00; B29K2105/0085; C08J2323/00; C08J2323/02; C08J2323/04; C08L23/0846; C08L23/0853; C08L23/0869; C08L2312/00; C08L2312/06; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
62 words
A heat-shrinkable film consisting essentially of a blend of 99.5-98.5 weight % of linear low or medium density polyethylene and 0.5-1.5 weight % of one or more copolymers of ethylene with a monomer selected from vinyl acetate and acrylic acids or esters, where said film has been cross-linked to the degree induced by an irradiation dosage of about 1 to 5 megarads.
Claim 2
Dependent Claim
62 words
A heat-shrinkable film consisting essentially of a blend of 99.5-98.5 weight % of linear low or medium density polyethylene and 0.5-1.5 weight % of one or more copolymers of ethylene with a monomer selected from vinyl acetate and acrylic acids or esters, where said film has been cross-linked to the degree induced by an irradiation dosage of about 1 to 5 megarads.
Claim 3
Dependent Claim
26 words
A film according to Claim 1 where said linear low or medium density polyethylene is a copolymer of ethylene with a C₈-C₁₈ alpha-olefin, preferably with 1-octene.
Claim 4
Dependent Claim
38 words
A film according to Claim 1 where said ethylene copolymer is selected from ethylene vinyl acetate having a vinyl acetate content of about 3 to 20% by weight, ethylene methyl acrylate, ethylene ethyl acrylate and ethylene acrylic acid.
Claim 5
Dependent Claim
27 words
A film according to Claim 3 where the amount of ethylene vinyl acetate or ethylene acrylic acid or ester in the blend is about 1% by weight.
Claim 6
Dependent Claim
23 words
A film according to Claim 1 which contains about 2400 to 3000 ppm of a fatty amide slip agent, which is preferably erucamide.
Claim 7
Dependent Claim
15 words
A film according to Claim 1 which contains about 1200 to 1500 silica anti-blocking agent.
Claim 8
Dependent Claim
55 words
A film ccording to Claim 1 where said linear low or medium density polyethylene is a copolymer of ethylene with 1-octene, where said copolymer of ethylene is ethylene vinyl acetate having preferably a vinyl acetate content of about 12%, and where the amount of ethylene vinyl acetate in the blend is about 1% by weight.
Claim 9
Independent Claim
65 words
A method for preparing a heat-shrinkable film comprising preparing a blend of 99.5-98.5 weight % of a linear low or medium density polyethylene with 0.5-1.5 weight % of one or more copolymers of ethylene with a monomer selected from vinyl acetate and acrylic acids or esters, extruding said blend into a film and irradiating said film at a dosage of about 1 to 5 megarads.
Claim 10
Independent Claim
65 words
A method for preparing a heat-shrinkable film comprising preparing a blend of 99.5-98.5 weight % of a linear low or medium density polyethylene with 0.5-1.5 weight % of one or more copolymers of ethylene with a monomer selected from vinyl acetate and acrylic acids or esters, extruding said blend into a film and irradiating said film at a dosage of about 1 to 5 megarads.
Claim 11
Dependent Claim
18 words
The method of Claim 8 where said blend is prepared by melt blending the polyethylene and ethylene copolymer.
Claim 12
Dependent Claim
19 words
The method of Claim 8 where said film is irradiated at a dosage of about 2.0 to 3.2 megarads.
References Cited (Backward Citations)
No citation records indexed.
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