US4233367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coextruded multilayer film
Assignee: Enron Chemical Co
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Filing: 1977-01-06
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Granted: 1980-11-11
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Expires: 1997-01-06
Abstract
Abstract A multilayer film is prepared by coextruding nylon with a chemically modified polyolefin which has functional groups added to the basic polymer to provide strong adhesion to the nylon after coextrusion. The multiple layer film combines the strength and protection properties of the nylon with desired properties in the modified polyolefin. Multiple layer films may be produced by coextruding nylon layers with multiple layers of the modified polyolefin, and with additional layers of nonmodified polyolefins and other polymers. Suitable commercially available modified polyolefins for use in the multilayer film include Plexar-1 and Plexar-3 described in U.S. patent application Ser. No. 616,035, and Plexar-2 described in U.S. patent application Ser. No. 616,374, both filed in September, 1975, now abandoned, and respective continuation-in-parts thereof Ser. No. 808,080, now U.S. Pat. No. 4,087,588, and Ser. No. 808,079, now U.S. Pat. No. 4,087,587.
Inventors
- 👤 William G. Ticknor
- 👤 Arnold R. Rein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:29
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/09; B29C48/10; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/305; B29C48/307; B29C48/32; B29C48/335; B32B7/00; B32B7/04; B32B7/10; B32B2309/00; B32B2309/02; B32B2309/022; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725; Y10T428/3175; Y10T428/31757; Y10T428/31855; Y10T428/31909; Y10T428/31931
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
68 words
A process for producing a multilayer film, comprising: coextruding nylon and a chemically modified polyolefin selected from the group consisting of ethylene vinyl acetate polymer, high density polyethylene and rubber modified high density polyethylene, each chemically modified by the provision of functional groups to the polymer which have a strong affinity for nylon and which will form a strong bond to nylon under heat and pressure of coextrusion.
Claim 2
Dependent Claim
68 words
A process for producing a multilayer film, comprising: coextruding nylon and a chemically modified polyolefin selected from the group consisting of ethylene vinyl acetate polymer, high density polyethylene and rubber modified high density polyethylene, each chemically modified by the provision of functional groups to the polymer which have a strong affinity for nylon and which will form a strong bond to nylon under heat and pressure of coextrusion.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein said modified polyolefin is a Plexar polymer.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein the nylon is coextruded between two layers of the modified polyolefin.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein a polyolefin is coextruded with said nylon and said chemically modified polyolefin.
Claim 6
Dependent Claim
66 words
A multilayer film comprising: a coextrusion of nylon and a chemically modified polyolefin selected from the group consisting of ethylene vinyl acetate polymer, high density polyethylene, and rubber modified high density polyethylene, each chemically modified by the provision of functional groups to the polymer which have a strong affinity for nylon and which will form strong bonds to nylon under the heat and pressure of coextrusion.
Claim 7
Dependent Claim
66 words
A multilayer film comprising: a coextrusion of nylon and a chemically modified polyolefin selected from the group consisting of ethylene vinyl acetate polymer, high density polyethylene, and rubber modified high density polyethylene, each chemically modified by the provision of functional groups to the polymer which have a strong affinity for nylon and which will form strong bonds to nylon under the heat and pressure of coextrusion.
Claim 8
Dependent Claim
28 words
The multilayer film of claim 5 wherein said coextrusion includes a layer of nylon between two layers of chemically modified polyolefin having strong adhesion to nylon after coextrusion.
Claim 9
Dependent Claim
14 words
The multilayer film of claim 5 wherein said modified polyolefin is a Plexar polymer.
Claim 10
Dependent Claim
71 words
A process for producing a multi-layer film, comprising: tubular blown film coextruding nylon and a chemically modified polyolefin selected from the group consisting of ethylene vinyl acetate polymer, high density polyethylene and rubber modified high density polyethylene, each chemically modified by the provision of functional groups to the polymer which have a strong affinity for nylon and which will form a strong bond to nylon under heat and pressure of coextrusion.
Claim 11
Dependent Claim
71 words
A process for producing a multi-layer film, comprising: tubular blown film coextruding nylon and a chemically modified polyolefin selected from the group consisting of ethylene vinyl acetate polymer, high density polyethylene and rubber modified high density polyethylene, each chemically modified by the provision of functional groups to the polymer which have a strong affinity for nylon and which will form a strong bond to nylon under heat and pressure of coextrusion.
Claim 12
Dependent Claim
100 words
A process for producing a multi-layer film, comprising: coextruding nylon, a chemically modified polyolefin, and a polymer, said chemically modified polyolefin being selected from the group consisting of ethylene vinyl acetate polymer, high density polyethylene and rubber modified high density polyethylene, each chemically modified by the provision of functional groups to the polymer which have a strong affinity for nylon and which will form a strong bond to nylon under heat and pressure of coextrusion, said polymer being selected from the group consisting of low, medium, and high density polyethylene, ionomers, ethylene vinyl acetate polymer, and ethylene acrylic acid polymer.
Claim 13
Dependent Claim
100 words
A process for producing a multi-layer film, comprising: coextruding nylon, a chemically modified polyolefin, and a polymer, said chemically modified polyolefin being selected from the group consisting of ethylene vinyl acetate polymer, high density polyethylene and rubber modified high density polyethylene, each chemically modified by the provision of functional groups to the polymer which have a strong affinity for nylon and which will form a strong bond to nylon under heat and pressure of coextrusion, said polymer being selected from the group consisting of low, medium, and high density polyethylene, ionomers, ethylene vinyl acetate polymer, and ethylene acrylic acid polymer.
Claim 14
Dependent Claim
106 words
A multi-layer film comprising: a coextrusion of nylon, a chemically modified polyolefin, and a polymer layer bonded to said modified polyolefin, said modified polyolefin selected from the group consisting of ethylene vinyl acetate polymer, high density polyethylene, and rubber modified high density polyethylene, each chemically modified by the provision of functional groups to the polymer which have a strong affinity for nylon and which will form strong bonds to nylon under the heat and pressure of coextrusion, said polymer layer being selected from the group consisting of high, medium and low density polyethylene, ionomers, ethylene vinyl acetate polymer, ethylene acrylic acid polymer, and rubber modified polyethylene.
Claim 15
Dependent Claim
106 words
A multi-layer film comprising: a coextrusion of nylon, a chemically modified polyolefin, and a polymer layer bonded to said modified polyolefin, said modified polyolefin selected from the group consisting of ethylene vinyl acetate polymer, high density polyethylene, and rubber modified high density polyethylene, each chemically modified by the provision of functional groups to the polymer which have a strong affinity for nylon and which will form strong bonds to nylon under the heat and pressure of coextrusion, said polymer layer being selected from the group consisting of high, medium and low density polyethylene, ionomers, ethylene vinyl acetate polymer, ethylene acrylic acid polymer, and rubber modified polyethylene.
Claim 16
Dependent Claim
117 words
A multi-layer film comprising: a coextrusion of nylon between two layers of a chemically modified polyolefin and a layer of polymer bonded to each of said layers of said modified polyolefin, said modified polyolefin being selected from the group consisting of ethylene vinyl acetate polymer, high density polyethylene, and rubber modified high density polyethylene, each chemically modified by the provision of functional groups to the polymer which have a strong affinity for nylon and which will form strong bonds to nylon under the heat and pressure of coextrusion, and said polymer being selected from the group consisting of high, medium, and low density polyethylene, ionomers, ethylene vinyl acetate polymer, ethylene acrylic acid polymer, and rubber modified polyethylene.
Claim 17
Dependent Claim
117 words
A multi-layer film comprising: a coextrusion of nylon between two layers of a chemically modified polyolefin and a layer of polymer bonded to each of said layers of said modified polyolefin, said modified polyolefin being selected from the group consisting of ethylene vinyl acetate polymer, high density polyethylene, and rubber modified high density polyethylene, each chemically modified by the provision of functional groups to the polymer which have a strong affinity for nylon and which will form strong bonds to nylon under the heat and pressure of coextrusion, and said polymer being selected from the group consisting of high, medium, and low density polyethylene, ionomers, ethylene vinyl acetate polymer, ethylene acrylic acid polymer, and rubber modified polyethylene.
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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) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |