US4574104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-layer film
Assignee: Idemitsu Kosan Co Ltd
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Filing: 1984-10-19
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Granted: 1986-03-04
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Expires: 2004-10-19
Abstract
Abstract The present invention relates to a multi-layer film comprising at least three layers of two outer layers and an intermediate layer sandwiched therebetween wherein the intermediate layer is formed of a resin composition of a high density polyethylene and an ethylene alpha -olefin copolymer, and the outer layers are formed of an ethylene alpha -olefin copolymer and at least one of the outer layers is formed of a resin composition of an ethylene alpha -olefin copolymer and a low density polyethylene. The object of the present invention is to provide a multi-layer film having a high mechanical strength and superior in properties such as heat sealability, anti-blocking, and suitability for automatic packaging.
Inventors
- 👤 Takanori Aishima
- 👤 Makoto Utsumi
- 👤 Yoshihiro Ezaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:12
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B27/322; B32B2307/00; B32B2307/70; B32B2307/72; B32B2323/00; B32B2323/04; B32B2323/043; B32B2323/046; B32B2323/10; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/2848; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
110 words
A multi-layer film comprising at least three layers, said three layers comprising two outer layers and an intermediate layer positioned between said outer layers, said intermediate layer being a resin composition comprising from 90 to 10% by weight of a high density polyethylene and from 10 to 90% by weight of an ethylene α-olefin copolymer, each of said two outer layers comprises an ethylene α-olefin copolymer and at least one of said two outer layers is a resin composition comprising from 98 to 50% by weight of an ethylene α-olefin copolymer and from 2 to 50% by weight of a low density polyethylene produced by the high pressure polymerization method.
Claim 2
Dependent Claim
110 words
A multi-layer film comprising at least three layers, said three layers comprising two outer layers and an intermediate layer positioned between said outer layers, said intermediate layer being a resin composition comprising from 90 to 10% by weight of a high density polyethylene and from 10 to 90% by weight of an ethylene α-olefin copolymer, each of said two outer layers comprises an ethylene α-olefin copolymer and at least one of said two outer layers is a resin composition comprising from 98 to 50% by weight of an ethylene α-olefin copolymer and from 2 to 50% by weight of a low density polyethylene produced by the high pressure polymerization method.
Claim 3
Dependent Claim
25 words
The multi-layer film of claim 1, wherein said intermediate layer resin composition also contains a low density polyethylene produced by the high pressure polymerization method.
Claim 4
Dependent Claim
18 words
The multi-layer film of claim 1, wherein said intermediate layer resin composition also contains a low-crystallinity α-olefin copolymer.
Claim 5
Dependent Claim
31 words
The multi-layer film of claim 1, wherein said ethylene α-olefin copolymers components of said intermediate layer and two outer layers have a density from 0.900 to 0.940 gram per cubic centimeter.
Claim 6
Dependent Claim
38 words
The multi-layer film of claim 1, wherein said ethylene α-olefin copolymers components of said intermediate layer and said two outer layers contains from 1 to 20% by weight of an α-olefin having from 3 to 20 carbon atoms.
Claim 7
Dependent Claim
14 words
The multi-layer film of claim 1, having a thickness of from 50° to 200°μ.
Claim 8
Dependent Claim
43 words
The multi-layer film of claim 1, wherein both of said outer layers comprise from 98 to 50% by weight of said ethylene α-olefin copolymer and from 2 to 50% by weight of said low density polyethylene produced by the high pressure polymerization method.
Claim 9
Dependent Claim
52 words
The multi-layer film of claim 1, having a thickness of from 50° to 200°μ and wherein both of said outer layers comprise from 98 to 50% by weight of said ethylene α-olefin copolymer and from 2 to 50% by weight of said low density polyethylene produced by the high pressure polymerization method.
Claim 10
Dependent Claim
31 words
The multi-layer film of claim 8, wherein said ethylene α-olefin copolymers components of said intermediate layer and two outer layers have a density from 0.900 to 0.940 gram per cubic centimeter.
Claim 11
Dependent Claim
56 words
The multi-layer film of claim 9, wherein said intermediate layer contains from 20 to 80% by weight of said copolymer and between 80 to 20% by weight of said high density polyethylene and wherein said outer layers contain from 4 to 40% by weight of said low density polyethylene produced by the high pressure polymerization method.
Claim 12
Dependent Claim
29 words
The multi-layer film of claim 10, wherein said outer layers contain from 5 to 30% by weight of said low density polyethylene produced by the high pressure polymerization method.
Claim 13
Dependent Claim
20 words
The multi-layer film of claim 11, wherein said intermediate layer contains from 25 to 60% of said high density polyethylene.
Claim 14
Dependent Claim
29 words
The multi-layer film of claim 1, wherein said outer layers contain from 5 to 30% by weight of said low density polyethylene produced by the high pressure polymerization method.
Claim 15
Dependent Claim
20 words
The multi-layer film of claim 1, wherein said intermediate layer contains from 25 to 60% of said high density polyethylene.
Claim 16
Dependent Claim
44 words
The multi-layer film of claim 1, wherein said outer layers contain from 5 to 30% by weight of said low density polyethylene produced by the high pressure polymerization method and wherein said intermediate layer contains from 25 to 60% of said high density polyethylene.
Claim 17
Dependent Claim
29 words
The multi-layer film of claim 7, wherein said outer layers contain from 5 to 30% by weight of said low density polyethylene produced by the high pressure polymerization method.
Claim 18
Dependent Claim
20 words
The multi-layer film of claim 7, wherein said intermediate layer contains from 25 to 60% of said high density polyethylene.
Claim 19
Dependent Claim
44 words
The multi-layer film of claim 7, wherein said outer layers contain from 5 to 30% by weight of said low density polyethylene produced by the high pressure polymerization method and wherein said intermediate layer contains from 25 to 60% of said high density polyethylene.
Claim 20
Dependent Claim
26 words
The multi-layer film of claim 1, wherein said high density polyethylene of said intermediate layer has a density from 0.948 to 0.965 gram per cubic centimeter.
Claim 21
Dependent Claim
27 words
The multi-layer film of claim 1, wherein said high density polyethylene of said intermediate layer has a melt index from 0.02 to 2 grams per ten minutes.
Claim 22
Dependent Claim
33 words
The multi-layer film of claim 1, which is prepared by co-extruding resin materials for said intermediate layer and resin materials for said two outer layers with a die of the in-die adhesion type.
Claim 23
Dependent Claim
48 words
The multi-layer film of claim 1, which is prepared by kneading resin materials for said intermediate layer and resin materials for said two outer layers, co-extruding these kneaded resin materials with a die of the in-die adhesion type, and then molding said co-extruded materials by an inflation method.
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) | 1989-03-03 | 1989-09-02 | 1990-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-03 | 1993-09-02 | 1994-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-03 | 1997-09-02 | 1998-03-04 | $7700.00 | Window Closed / Lapsed |