Patent US4104404A successfully refreshed from Google Patents.
US4104404A
Expired / Lapsed
US
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Cross-linked amide/olefin polymeric tubular film coextruded laminates
Assignee: WR Grace and Co Conn
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Filing: 1976-05-24
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Granted: 1978-08-01
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Expires: 1996-05-24
Abstract
Abstract An amide/olefin polymeric film laminate suitable for packaging, water cooking, and storing food within the package is prepared by coextruding polyamide and polyolefin layers to form a laminate and then cross-linking the laminate by irradiation. Prior art polyolefin/polyamide laminates delaminate readily when subjected to agitation in hot water, but this tendency is significantly reduced by laminates according to the present invention.
Inventors
- 👤 Anne C. Bieler
- 👤 Henry G. Schirmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:01
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C71/00; B29C71/04; B32B1/00; B32B1/08; B32B27/16; B32B27/30; B32B27/306; B32B27/32; B32B27/34; B32B7/00; B32B7/04; B32B7/12; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0844; B29C2035/085; B29C35/0866; B29C2035/0872; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2077/00; B32B2323/00; B32B2323/04; B32B2323/046; B32B2377/00; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/31504; Y10T428/31536; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/3175; Y10T428/31757; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
70 words
A coextruded, tubular, laminated polymeric film for use in elevated temperature media comprising: (a) a layer comprising a film-forming amide polymer; (b) a layer comprising a mono-alpha olefin polymer; (c) an adhesive disposed between said amide and olefin layers, said adhesive having mono-olefin units as the major component thereof; (d) said adhesive and said olefin polymer each being cross-linked by radiation to a dosage level of at least 6 MR.
Claim 2
Dependent Claim
70 words
A coextruded, tubular, laminated polymeric film for use in elevated temperature media comprising: (a) a layer comprising a film-forming amide polymer; (b) a layer comprising a mono-alpha olefin polymer; (c) an adhesive disposed between said amide and olefin layers, said adhesive having mono-olefin units as the major component thereof; (d) said adhesive and said olefin polymer each being cross-linked by radiation to a dosage level of at least 6 MR.
Claim 3
Dependent Claim
19 words
The laminate of claim 1 wherein there is an olefin polymer layer on each side of said amine layer.
Claim 4
Dependent Claim
11 words
The laminate of claim 1 wherein said olefin layer is polyethylene.
Claim 5
Dependent Claim
15 words
The laminate of claim 1 wherein the olefin units in said adhesive are ethylene units.
Claim 6
Dependent Claim
19 words
The laminate of claim 1 wherein said polyamide layer comprises four sublayers and said polyolefin layers comprise two sublayers.
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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) | 1981-07-31 | 1982-01-30 | 1982-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-31 | 1986-01-30 | 1986-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-31 | 1990-01-30 | 1990-08-01 | $7700.00 | Window Closed / Lapsed |