Patent US4223095A successfully refreshed from Google Patents.
US4223095A
Expired / Lapsed
US
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Flame-resistant polyurethane foam and a process for its production
Assignee: Bayer AG
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Filing: 1978-11-29
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Granted: 1980-09-16
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Expires: 1998-11-29
Abstract
Abstract A flame-resistant polyurethane foam is obtained by treatment of the foam with a mixture of aluminium hydroxide and a carboxyl group-containing polychloroprene latex and cross-linking the latex with zinc oxide or magnesium oxide.
Inventors
- 👤 Heinz Esser
- 👤 Hans W. Illger
- 👤 Heinz Muller
- 👤 Willi Kost
- 👤 Alberto C. Gonzalez-Dorner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:02
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; C08J9/40; C08J9/42; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08J2375/00; C08J2375/04; C08J2421/00; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
61 words
A flame-resistant polyurethane foam prepared by a process which comprises treating a polyurethane foam with a mixture of (a) a polychloroprene latex containing from 1 to 7% by weight of carboxylic acid units chemically incorporated by polymerization and (b) a flame-resistant amount of aluminum hydroxide and cross linking the latex with a cross-linking agent consisting of zinc oxide or magnesium oxide.
Claim 2
Dependent Claim
61 words
A flame-resistant polyurethane foam prepared by a process which comprises treating a polyurethane foam with a mixture of (a) a polychloroprene latex containing from 1 to 7% by weight of carboxylic acid units chemically incorporated by polymerization and (b) a flame-resistant amount of aluminum hydroxide and cross linking the latex with a cross-linking agent consisting of zinc oxide or magnesium oxide.
Claim 3
Dependent Claim
34 words
A process for the production of a flame-resistant polyurethane foam as claimed in claim 1, wherein the polyurethane foam is treated with from 0.1-8 times its quantity of said mixture, calculated as solid content.
Claim 4
Dependent Claim
24 words
A process as claimed in claim 2 wherein the treatment of the polyurethane foam is carried out by spraying the foam with said mixture.
Claim 5
Dependent Claim
34 words
A process as claimed in claim 2, wherein the mixture contains from 5-15 parts by weight of zinc oxide or magnesium oxide, based on 100 parts by weight of the dry content of rubber.
Claim 6
Dependent Claim
29 words
A process as claimed in claim 2, wherein from 1-3 mol of zinc oxide or magnesium oxide are used per mol of carboxyl groups for cross-linking the polychloroprene latex.
Claim 7
Dependent Claim
26 words
A process as claimed in claim 2, wherein the polychloroprene latex contains from 3 to 5% by weight of carboxylic acid units incorporated therein by polymerization.
Claim 8
Dependent Claim
30 words
A process as claimed in claim 2, wherein from 5-30% by weight of a halogenated hydrocarbon and/or from 5-30% by weight of antimony-III oxide are added to the polychloroprene latex.
References Cited (Backward Citations)
US4169184A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |