US4352850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Five-layered packaging film
Assignee: Kureha Corp
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Filing: 1981-03-05
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Granted: 1982-10-05
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Expires: 2001-03-05
Abstract
Abstract A five-layered packaging film comprises (a) an outer layer, (b) an adhesive layer, (c) a core layer, (b) an adhesive layer and (d) an inner layer in the order of lamination. The five-layered packaging film of the present invention is favorable in transparency, surface lustre, gas-barriering property. Further, the film has good thermoformability, heat-sealability and suitable shrinkability.
Inventors
- 👤 Masataka Yamamoto
- 👤 Tsutomu Uehara
- 👤 Minoru Yoshimori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:33
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/04; B32B7/12; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/306; B32B27/32; B32B2309/00; B32B2309/08; B32B2309/10; B32B2309/105; B32B2323/00; B32B2323/04; B32B2323/10; B32B2331/00; B32B2331/04; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24959; Y10T428/24967; Y10T428/24975; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
270 words
A five-layered packaging film for packaging soft foodstuffs comprising: (a) an outer layer, (b) a first adhesive layer, (c) a core layer, (d) a second adhesive layer and (e) an inner layer in order of lamination; said outer layer being 15 to 35 microns in thickness and consisting essentially of a saponified copolymer of ethylene and vinyl acetate containing 25 to 75 mole % of ethylene units with a degree of saponification of higher than 90%, said first and second adhesive layers each being 0.1 to 10 microns in thickness and consisting essentially of a graft copolymer containing (i) 95 to 99.99% by weight of a resin selected from the group consisting of polymers of alpha-olefines, copolymers of alpha-olefines and vinyl acetate and saponified copolymers thereof, and (ii) 0.01 to 5% by weight of unsaturated carboxylic acid units or anhydride units thereof, said core layer being 35 to 55 microns in thickness and consisting essentially of a polymer selected from the group consisting of (i) copolymers of ethylene and vinyl acetate containing 85 to 95% by weight of ethylene units, (ii) polyethylenes and (iii) polypropylenes, said inner layer being 50 to 80 microns in thickness and consisting essentially of an ionomer containing sodium or zinc as a metallic component and a copolymer of an alpha-olefine and acrylic acid or methacrylic acid; and the total thickness of said five-layered packaging film being 100 to 180 microns and the specific elasticity of said five-layered packaging film being 2 to 6 kg/cm of the width of said five-layered packaging film at an elongation at 2.5% and a temperature of 50° to 150° C.
Claim 2
Dependent Claim
270 words
A five-layered packaging film for packaging soft foodstuffs comprising: (a) an outer layer, (b) a first adhesive layer, (c) a core layer, (d) a second adhesive layer and (e) an inner layer in order of lamination; said outer layer being 15 to 35 microns in thickness and consisting essentially of a saponified copolymer of ethylene and vinyl acetate containing 25 to 75 mole % of ethylene units with a degree of saponification of higher than 90%, said first and second adhesive layers each being 0.1 to 10 microns in thickness and consisting essentially of a graft copolymer containing (i) 95 to 99.99% by weight of a resin selected from the group consisting of polymers of alpha-olefines, copolymers of alpha-olefines and vinyl acetate and saponified copolymers thereof, and (ii) 0.01 to 5% by weight of unsaturated carboxylic acid units or anhydride units thereof, said core layer being 35 to 55 microns in thickness and consisting essentially of a polymer selected from the group consisting of (i) copolymers of ethylene and vinyl acetate containing 85 to 95% by weight of ethylene units, (ii) polyethylenes and (iii) polypropylenes, said inner layer being 50 to 80 microns in thickness and consisting essentially of an ionomer containing sodium or zinc as a metallic component and a copolymer of an alpha-olefine and acrylic acid or methacrylic acid; and the total thickness of said five-layered packaging film being 100 to 180 microns and the specific elasticity of said five-layered packaging film being 2 to 6 kg/cm of the width of said five-layered packaging film at an elongation at 2.5% and a temperature of 50° to 150° C.
Claim 3
Dependent Claim
24 words
The film according to claim 1, wherein the outer layer and the core layer are 30 to 120 microns in the sum of thicknesses.
Claim 4
Dependent Claim
16 words
The film according to claim 1, wherein the sum of thicknesses is 50 to 90 microns.
Claim 5
Dependent Claim
37 words
The film according to claim 1 or 3, wherein the outer layer and the core layer have the ratio of the thickness of the outer layer to that of the core layer being from 1 to 2.
Claim 6
Dependent Claim
25 words
The film according to claim 1, wherein the thickness of the adhesive layer is less than 5% of the thickness of the five-layered packaging film.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-04 | 1986-04-05 | 1986-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-04 | 1990-04-05 | 1990-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-04 | 1994-04-05 | 1994-10-05 | $7700.00 | Window Closed / Lapsed |