US4331779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ethylenic polymer foams having improved dimensional stability
Assignee: Dow Chemical Co
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Filing: 1980-07-07
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Granted: 1982-05-25
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Expires: 2000-07-07
Abstract
Abstract The dimensional stability of relatively unstable substantially closed-cell low density foams of non-ionic ethylenic polymers (e.g., polyethylene, ethylene/vinyl acetate copolymers, etc.) can be notably improved by the incorporation therein (during the preparation thereof) of from about 5 to about 95 weight percent (based on total polymer weight) of a copolymer of ethylene with from about 3 to about 45 weight percent of a monoethylenically unsaturated carboxylic acid.
Inventors
- 👤 Chung P. Park
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:46
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J9/04; C08J9/12; C08J9/14; C08J9/141; C08J9/143; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/08; C08J2423/00; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S521/00; Y10S521/91
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
78 words
A low density, substantially closed-cell ethylenic polymer foam comprising, based upon the total weight of such polymer foam, from about 5 to about 95 weight percent of a non-ionic ethylenic polymer and from about 5 to about 95 weight percent of non-neutralized carboxylated copolymer comprising, in addition polymerized form, a predominant amount of ethylene and from about 3 to about 45 weight percent, based upon the weight of such non-neutralized carboxylated copolymer, of a monoethylenically unsaturated carboxylic acid.
Claim 2
Dependent Claim
78 words
A low density, substantially closed-cell ethylenic polymer foam comprising, based upon the total weight of such polymer foam, from about 5 to about 95 weight percent of a non-ionic ethylenic polymer and from about 5 to about 95 weight percent of non-neutralized carboxylated copolymer comprising, in addition polymerized form, a predominant amount of ethylene and from about 3 to about 45 weight percent, based upon the weight of such non-neutralized carboxylated copolymer, of a monoethylenically unsaturated carboxylic acid.
Claim 3
Dependent Claim
32 words
The polymer foam of claim 1 wherein the carboxylated copolymer comprises from 5 to about 35 weight percent of the monoethylenically unsaturated carboxylic acid based upon the weight of such carboxylated copolymer.
Claim 4
Dependent Claim
23 words
The polymer foam of claim 1 wherein the carboxylated copolymer constitutes from about 5 to about 40 weight percent of such polymer foam.
Claim 5
Dependent Claim
32 words
The polymer foam of claim 3, wherein the carboxylated copolymer contains, based upon the weight of such copolymer, from about 15 to about 45 weight percent of the monoethylenically unsaturated carboxylic acid.
Claim 6
Dependent Claim
32 words
The polymer foam of claim 3, wherein the carboxylated copolymer contains, based upon the weight of such copolymer, from about 3 to about 15 weight percent of the monoethylenically unsaturated carboxylic acid.
Claim 7
Dependent Claim
27 words
The polymer foam of claim 5 which further comprises, based upon polymer weight, from about 0.1 to about 10 weight percent of an auxiliary stability control agent.
Claim 8
Dependent Claim
31 words
The polymer foam of claim 6, wherein the auxiliary stability control agent is employed in an amount of from about 0.2 to about 2 weight percent based upon the polymer weight.
Claim 9
Dependent Claim
14 words
The polymer foam of claim 7, wherein the auxiliary stability control agent is stearamide.
Claim 10
Dependent Claim
13 words
The polymer foam of claim 1, wherein the non-ionic polymer thereof is polyethylene.
Claim 11
Dependent Claim
35 words
The polymer foam of claim 1, wherein the non-ionic polymer is a copolymer of ethylene with from 5 to about 45 weight percent, based upon the weight of such non-ionic polymer, of a non-ionic comonomer.
Claim 12
Dependent Claim
13 words
The polymer foam of claim 10, wherein the non-ionic comonomer is vinyl acetate.
Claim 13
Dependent Claim
13 words
The polymer foam of claim 10, wherein the non-ionic comonomer is ethyl acrylate.
Claim 14
Dependent Claim
23 words
The polymer foam of claim 10, wherein the non-ionic comonomer constitutes from about 10 to about 45 weight percent of the non-ionic copolymer.
Claim 15
Dependent Claim
23 words
The polymer foam of claim 10, wherein the non-ionic comonomer constitutes from about 15 to about 30 weight percent of the non-ionic copolymer.
Claim 16
Dependent Claim
15 words
The polymer foam of claim 1, wherein the monoethylenically unsaturated carboxylic acid is acrylic acid.
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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) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |