US4071484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing flexible flame retarding polyurethane foams
Assignee: Achilles Corp
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Filing: 1976-07-07
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Granted: 1978-01-31
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Expires: 1996-07-07
Abstract
Abstract This invention relates to a process for preparing unshrinking, flexible, and flame retarding polyurethane foams from a polyhydroxyl compound, diisocyanate, a blowing agent, a catalyst and other auxiliary agents.
Inventors
- 👤 Yasumasa Sawachika
- 👤 Hiroshi Kawakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:55
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8009; C08G18/8012; Y; Y10; Y10S; Y10S521/00; Y10S521/903
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
129 words
A process for preparing unshrinking flexible and flame retarding polyurethane foams, comprising mixing; A. diisocyanate mixture which contains 80 to 45% by weight of diisocyanate and 20 to 55% by weight of urethane-modified diisocyanate obtained by reacting A-1. one mole of a dihydroxyl aromatic compound selected from the group consisting of 1,2-dihydroxybenzene, 1,3-dihydroxybenzene, 2,4-dihydroxytoluene, 2,2'-dihydroxydiphenyl, 4,4'-dihydroxydiphenyl, 2,2'-dihydroxybenzophenone and 3,3'-dihydroxydiphenylmethane with A-2. 4 to 15 moles of diisocyanate at a temperature from 80° C to 130° C for 3 to 35 hours B. a polyhydroxyl compound having at least two active hydrogen atoms and a molecular weight between 1000 and 10000, at least 10% by weight thereof being primary hydroxyl, C. a foaming agent, and D. a catalyst, and foaming and curing the thus obtained foam in the conventional manner.
Claim 2
Dependent Claim
129 words
A process for preparing unshrinking flexible and flame retarding polyurethane foams, comprising mixing; A. diisocyanate mixture which contains 80 to 45% by weight of diisocyanate and 20 to 55% by weight of urethane-modified diisocyanate obtained by reacting A-1. one mole of a dihydroxyl aromatic compound selected from the group consisting of 1,2-dihydroxybenzene, 1,3-dihydroxybenzene, 2,4-dihydroxytoluene, 2,2'-dihydroxydiphenyl, 4,4'-dihydroxydiphenyl, 2,2'-dihydroxybenzophenone and 3,3'-dihydroxydiphenylmethane with A-2. 4 to 15 moles of diisocyanate at a temperature from 80° C to 130° C for 3 to 35 hours B. a polyhydroxyl compound having at least two active hydrogen atoms and a molecular weight between 1000 and 10000, at least 10% by weight thereof being primary hydroxyl, C. a foaming agent, and D. a catalyst, and foaming and curing the thus obtained foam in the conventional manner.
Claim 3
Dependent Claim
13 words
A process according to claim 1, wherein the diisocyanate is an aliphatic diisocyanate.
Claim 4
Dependent Claim
8 words
A process according to claim 1, wherein the
Claim 5
Dependent Claim
13 words
A process according to claim 1, wherein the diisocyanate is an aromatic diisocyanate.
Claim 6
Dependent Claim
18 words
A process according to claim 1, wherein the diisocyanate is a mixture of more than two aliphatic diisocyanates.
Claim 7
Dependent Claim
18 words
A process according to claim 1, wherein the diisocyanate is a mixture of more than two cycloaliphatic diisocyanates.
Claim 8
Dependent Claim
18 words
A process according to claim 1, wherein the diisocyanate is a mixture of more than two aromatic diisocyanates.
References Cited (Backward Citations)
US3832311A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-30 | 1981-08-01 | 1982-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-30 | 1985-08-01 | 1986-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-30 | 1989-08-01 | 1990-01-31 | $7700.00 | Window Closed / Lapsed |