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US4456646A
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US
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Laminate film having a heat-shrinkage rate greater than 15 percent at 90° C.
Assignee: Kureha Corp
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Filing: 1981-10-21
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Granted: 1984-06-26
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Expires: 2001-10-21
Abstract
Abstract Described is a laminate film excellent in oil-resistance, heat-resistant sealing ability, peel resistance and gas-barriering property having a percentage of heat-shrinkage of larger than 15% at 90° C. comprising a center layer consisting of a copolymer(I) of vinylidene chloride and both two outermost layers consisting of a mixture of 20 to 70% by weight of a copolymer(II) of ethylene and alpha-olefin of density of 0.900 to 0.950 and of crystalline melting point of 110° to 125° C. and 80 to 30% by weight of a copolymer(III) of ethylene and vinyl acetate with the proviso that the content of the copolymer(II) in the total amount of copolymers in both the two outermost layers is less than 65% by weight and showing a structure of having an adhesive layer between the center layer and the outermost layer.
Inventors
- 👤 Yoshiharu Nishimoto
- 👤 Kengo Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:53
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/304; B32B27/32; B32B27/322; B32B7/00; B32B7/04; B32B7/12; B29; B29K; B29K2027/00; B29K2027/08; B32B2307/00; B32B2307/70; B32B2307/732; B32B2307/734; B32B2307/736; B32B2327/00; B32B2327/12; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/31504; Y10T428/31855; Y10T428/31931; Y10T428/31935
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
117 words
A laminate film having a heat-shrinkage rate of greater than 15% at 90° C., comprising a center layer consisting of a copolymer (I) of vinylidene chloride; at least two outermost layers each consisting of a mixture of 20 to 70% by weight of copolymer(II) of ethylene and alpha-olefin having a crystalline melting point of 110° to 125° C., and 80 to 30% by weight of a copolymer(III) of ethylene and vinyl acetate having a crystalline melting point of 85° to 103° C., said copolymer(II) being less than 65% by weight of the total amount of copolymers (II) and (III) in both of the outermost layers; and an adhesive layer between the center layer and the outermost layers.
Claim 2
Dependent Claim
117 words
A laminate film having a heat-shrinkage rate of greater than 15% at 90° C., comprising a center layer consisting of a copolymer (I) of vinylidene chloride; at least two outermost layers each consisting of a mixture of 20 to 70% by weight of copolymer(II) of ethylene and alpha-olefin having a crystalline melting point of 110° to 125° C., and 80 to 30% by weight of a copolymer(III) of ethylene and vinyl acetate having a crystalline melting point of 85° to 103° C., said copolymer(II) being less than 65% by weight of the total amount of copolymers (II) and (III) in both of the outermost layers; and an adhesive layer between the center layer and the outermost layers.
Claim 3
Dependent Claim
35 words
A laminate film according to claim 1, wherein said copolymer(I) comprises 65 to 95% by weight of vinylidene chloride and 35 to 5% by weight of at least one unsaturated monomer copolymerizable with vinylidene chloride.
Claim 4
Dependent Claim
32 words
A laminate film according to claim 1, wherein said copolymer(II) is a copolymer of ethylene and one or more alpha-olefins selected from the group consisting of butene-1, pentene-1, 4-methylpentene-1, hexene-1 and octene-1.
Claim 5
Dependent Claim
31 words
A laminate film according to claim 1, wherein said copolymer(III) falls in the pentagonal range defined in FIG. 1 by linear lines connecting the points (W-1), (W-II), (X-II), and (Z-I), respectively.
Claim 6
Dependent Claim
38 words
A laminate film according to claim 1, wherein said adhesive layer comprises a polymer or a mixture of polymers selected from the group consisting of polyethylene modified by a carboxylic acid, a copolymer of ethylene and vinyl acetate.
Claim 7
Dependent Claim
26 words
A laminate film according to claim 1, or claim 5 wherein the thickness of said adhesive layer is in the range of 1 to 3 microns.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |