US4495249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat shrinkable multi-layered laminate film
Assignee: Kureha Corp
•
Filing: 1983-02-04
•
Granted: 1985-01-22
•
Expires: 2003-02-04
Abstract
Abstract Disclosed herein is a heat-shrinkable multi-layered laminate film comprising a core layer made of a saponified copolymer of ethylene and vinyl acetate, two outer layers made of a mixture of a copolymer of ethylene and vinyl acetate having a crystal melting point of 85° to 103° C. and a copolymer of propylene and ethylene having a crystal melting point of 126° to 155° C. or a linear low-density polyethylene having a crystal melting point of 110° to 125° C. and two adhesive layers disposed between the core layer and the two outer layers, the multi-layered laminate film being excellent in gas-barrier property, oil resistance and peel-resistance of the sealed parts in the heat shrinkage and suitable for heat-shrinking packaging of foodstuffs, particularly for vacuum heat-packaging of foodstuffs.
Inventors
- 👤 Masaki Ohya
- 👤 Yoshiharu Nishimoto
- 👤 Kengo Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:43
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/30; B32B27/06; B32B27/08; B32B27/306; B32B27/32; B32B27/322; B32B33/00; C; C09; C09J; C09J123/00; C09J123/02; C09J123/04; C09J123/08; C09J123/0807; C09J123/0815; B32B2307/00; B32B2307/50; B32B2307/70; B32B2307/732; B32B2307/734; B32B2307/736; B32B2323/00; B32B2323/04; B32B2323/046; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/04; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
145 words
A heat-shrinkable laminate film excellent in gas-barrier property, oil-resistance and peel-resistance, comprising a core layer made of a saponified copolymer of ethylene and vinyl acetate, two outer layers made of a resin selected from mixtures of 80 to 30% by weight of a copolymer of ethylene and vinyl acetate having a crystal melting point in a range of 85° to 103° C. and 20 to 70% by weight of a linear low-density polyethylene having a crystal melting point in a range of 110° to 125° C. or a copolymer of propylene and ethylene having a crystal melting point of 126° to 155° C., and two adhesive layers disposed between the core layer and the outer layers, the ratio of the weight of the copolymer of ethylene and vinyl acetate to the total weight of the polymers of the two outer layers being larger than 0.4.
Claim 2
Dependent Claim
145 words
A heat-shrinkable laminate film excellent in gas-barrier property, oil-resistance and peel-resistance, comprising a core layer made of a saponified copolymer of ethylene and vinyl acetate, two outer layers made of a resin selected from mixtures of 80 to 30% by weight of a copolymer of ethylene and vinyl acetate having a crystal melting point in a range of 85° to 103° C. and 20 to 70% by weight of a linear low-density polyethylene having a crystal melting point in a range of 110° to 125° C. or a copolymer of propylene and ethylene having a crystal melting point of 126° to 155° C., and two adhesive layers disposed between the core layer and the outer layers, the ratio of the weight of the copolymer of ethylene and vinyl acetate to the total weight of the polymers of the two outer layers being larger than 0.4.
Claim 3
Dependent Claim
21 words
A heat-shrinkable laminate film according to claim 1, wherein at least one of said outer layers contains said linear low-density polyethylene.
Claim 4
Dependent Claim
38 words
A heat-shrinkable laminate film according to claim 1, wherein said saponified copolymer of ethylene and vinyl acetate contains 20 to 80 mol % of ethylene units and has a saponification degree of not less than 50 mol %.
Claim 5
Dependent Claim
38 words
A heat-shrinkable laminate film according to claim 1, wherein said linear low-density polyethylene is a copolymer of ethylene and an alpha-olefin having not more than 18 carbons of a ratio of copolymerization of 99.0:1.0 to 70:30 by weight.
Claim 6
Dependent Claim
24 words
A heat-shrinkable laminate film according to claim 1, wherein said copolymer of propylene and ethylene contains 1 to 7% by weight of ethylene units.
Claim 7
Dependent Claim
118 words
A heat-shrinkable laminate film according to any one of claims 1 to 5, wherein said copolymer of ethylene and vinyl acetate contained in at least one of said outer layers is such that the content of vinyl acetate units thereof defined by percentage by weight of said copolymer and the melt index of said copolymer defined by g/10 min are expressed by x-coordinate and y-coordinate, respectively of one of the points falling within a heptagone defined by the following seven vertices: A(3,0.2), B(12,0.2)C(12,0.5), D(9,0.5), E(5,2.0), F(5,4.0) and G(3,4.0), on a plane defined by an abscissa representing said content of vinyl acetate in percentage by weight of said copolymer and an ordinate representing said melt index in g/10 min.
References Cited (Backward Citations)
GB1510115A
Cited
US4058647A
Cited
GB1510116A
Cited
US4064296A
Cited
US4182457A
Cited
US4217161A
Cited
JPS5363484A
Cited
JPS5365379A
Cited
JPS5413582A
Cited
JPS54130685A
Cited
US4228215A
Cited
GB2037660A
Cited
US4281045A
Cited
US4424243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |