Patent US3846508A successfully refreshed from Google Patents.
US3846508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire retardant polyurethanes containing trichloroethylene/vinyl acetate copolymer
Assignee: Dow Chemical Co
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Filing: 1973-08-01
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Granted: 1974-11-05
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Expires: 1993-08-01
Abstract
Abstract Markedly improved flame retardance is imparted to polyurethanes by incorporating therein a trichloroethylene/vinyl acetate copolymer. The resulting flame retardant compositions are particularly useful as instant set or elastomeric urethanes and in the fabrication of foamed polyurethanes.
Inventors
- 👤 D Heinert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:53
CPC Classifications
C; C08; C08L; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
103 words
A POLYURETHANE PLASTIC CONTAINING A FLAME RETARDING AMOUNT OF A COPOLYMER SAID AMOUNT BEING IN THE RANGE FROM ABOUT 1 TO ABOUT 50 WEIGHT PERCENT BASED ON THE WEIGHT OF THE POLYURETHANE, AND SAID COPOLYMER CONSISTING ESSENTIALLY OF FROM ABOUT 33.3 TO ABOUT 66.7 MOLE PERCENT OF TRICHLOROETHYLENE AND FROM ABOUT 33.3 TO ABOUT 66.7 MOLE PERCENT OF VINYL ACETATE WHEREIN FROM 0 TO ABOUT 100 MOLE PERCENT OF THE COPOLYMERIZED VINYL ACETATE IS HYDROLYZED TO VINYL ALCOHOL OR IS HYDROLYZED AND THEN RE-ESTERIFIED WITH A CARBOXYLIC ACID, SAID COPOLYMER HAVING A MOLECULAR WEIGHT IN THE RANGE FROM ABOUT 300 TO ABOUT 20,000.
Claim 2
Dependent Claim
103 words
A POLYURETHANE PLASTIC CONTAINING A FLAME RETARDING AMOUNT OF A COPOLYMER SAID AMOUNT BEING IN THE RANGE FROM ABOUT 1 TO ABOUT 50 WEIGHT PERCENT BASED ON THE WEIGHT OF THE POLYURETHANE, AND SAID COPOLYMER CONSISTING ESSENTIALLY OF FROM ABOUT 33.3 TO ABOUT 66.7 MOLE PERCENT OF TRICHLOROETHYLENE AND FROM ABOUT 33.3 TO ABOUT 66.7 MOLE PERCENT OF VINYL ACETATE WHEREIN FROM 0 TO ABOUT 100 MOLE PERCENT OF THE COPOLYMERIZED VINYL ACETATE IS HYDROLYZED TO VINYL ALCOHOL OR IS HYDROLYZED AND THEN RE-ESTERIFIED WITH A CARBOXYLIC ACID, SAID COPOLYMER HAVING A MOLECULAR WEIGHT IN THE RANGE FROM ABOUT 300 TO ABOUT 20,000.
Claim 3
Dependent Claim
63 words
The polyurethane plastic of claim 1 comprising a polyurethane containing from about 1 to about 50 weight percent based on the polyurethane of a copolymer of from about 50 to about 66.7 mole percent of trichloroethylene and from about 33.3 to about 50 mole percent of vinyl acetate, said copolymer having a molecular weight in the range from about 300 to about 6,000.
Claim 4
Dependent Claim
74 words
The polyurethane plastic of claim 2 comprising a polyurethane which is the reaction product of a polyisocyanate and an alcohol containing from about 5 to about 33.3 weight percent based on the polyurethane of a copolymer of from about 57 to about 66.7 mole percent of trichloroethylene and from about 33.3 to about 43 mole percent of vinyl acetate, said copolymer having a molecular weight in the range from about 300 to about 2,500.
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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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |