Patent US4280768A successfully refreshed from Google Patents.
Patent US3873667A successfully refreshed from Google Patents.
US3873667A
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Process for preparing articles fabricated from polyolefin/polyamide blends having low permeability to gases
Assignee: Continental Can Co Inc
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Filing: 1971-03-18
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Granted: 1975-03-25
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Expires: 1991-03-18
Abstract
Abstract The gas permeability of shaped articles fabricated from polyolefin/linear polyamide blends is decreased by heating the article at a temperature of 140*-250*F for 0.1 to 30 minutes.
Inventors
- 👤 Raymond J Preto
- 👤 Eugene Z Scheckman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:22
CPC Classifications
C; C08; C08L; C08L77/00; B; B29; B29C; B29C71/00; B29C71/02; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/08; C08L23/0846; C08L23/0869; C08L77/02; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2077/00; B29K2105/00; B29K2105/0088; C08L2207/00; C08L2207/06; C08L2207/062
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
84 words
A METHOD OF DECREASING THE GAS PERMEABILITY OF SHAPED ARTICLES FABRICATED FROM BLENDS OF POLYOLEFINS AND SYNTHETIC LINEAR POLYAMIDES WHICH COMPRISES A. FABRICATING A SHAPED ARTICLE FROM A MIXTURE COMPRISED OF ABOUT 40 TO ABOUT 90 PERCENT BY WEIGHT OF A POLYOLEFIN AND ABOUT 10 TO ABOUT 60 PERCENT BY WEIGHT OF A SYNTHETIC LINEAR POLYAMIDE AND THEN B. HEATING THE FABRICATED ARTICLE AT ABOUT 140* TO ABOUT 250*F FOR A TIME SUFFICIENT TO EFFECT A DECREASE IN THE GAS PERMEABILITY OF THE ARTICLE.
Claim 2
Independent Claim
84 words
A METHOD OF DECREASING THE GAS PERMEABILITY OF SHAPED ARTICLES FABRICATED FROM BLENDS OF POLYOLEFINS AND SYNTHETIC LINEAR POLYAMIDES WHICH COMPRISES A. FABRICATING A SHAPED ARTICLE FROM A MIXTURE COMPRISED OF ABOUT 40 TO ABOUT 90 PERCENT BY WEIGHT OF A POLYOLEFIN AND ABOUT 10 TO ABOUT 60 PERCENT BY WEIGHT OF A SYNTHETIC LINEAR POLYAMIDE AND THEN B. HEATING THE FABRICATED ARTICLE AT ABOUT 140* TO ABOUT 250*F FOR A TIME SUFFICIENT TO EFFECT A DECREASE IN THE GAS PERMEABILITY OF THE ARTICLE.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the article is heated for a period of about 0.1 to 30 minutes.
Claim 4
Dependent Claim
10 words
The method of claim 1 wherein the polyolefin is polyethylene.
Claim 5
Dependent Claim
10 words
The method of claim 1 wherein the polyamide is polycaproamide.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein the article is heated with steam in the range of 155* to 212*F for 0.1 to 15 minutes.
Claim 7
Dependent Claim
72 words
The method of claim 1 wherein a copolymer of an alpha olefin having the formula R - CH CH2 wherein R is a radical selected from the group consisting of hydrogen and alkyl radicals containing 1 to 3 carbon atoms and an alpha, beta-ethylenically unsaturated carboxylic acid containing 3 to 5 carbon atoms, is incorporated in the polymer mixture at a concentration ranging from about 1 to about 20 percent by weight.
References Cited (Backward Citations)
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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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |