US4029611A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbodiimide-isocyanurate foams modified with polyfurfuryl alcohol polymers
Assignee: BASF Corp
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Filing: 1975-12-18
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Granted: 1977-06-14
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Expires: 1995-12-18
Abstract
Abstract Rigid cellular foams are prepared by catalytically condensing an organic polyisocyanate in the presence of (a) a carbodiimide-promoting catalyst, (b) a trimerization catalyst, and (c) a polyfurfuryl alcohol polymer. The resulting foam compositions are characterized by carbodiimide and isocyanurate linkages and exhibit improved friability and flame retardancy.
Inventors
- 👤 Moses Cenker
- 👤 Thirumurti Narayan
- 👤 John Thomas Patton, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:09
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/64; C08G18/02; C08G18/025; C08G18/08; C08G18/09; C08G18/095; C08G18/54; C08G18/67; C08G18/6705; C08G2110/00; C08G2110/0025; C08G2110/0041; C08G2115/00; C08G2115/02; C08G2115/06; Y; Y10; Y10S; Y10S521/00; Y10S521/901; Y10S521/902
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
49 words
A cellular foam characterized by carbodimide and isocyanurate linkages prepared by catalytically condensing an organic polyisocyanate in the presence of (a) a carbodiimide-promoting catalyst; (b) a trimerization catalyst, and (c) from 5 to 100% by weight, based on the weight of the organic polyisocyanate of a polyfurfuryl alcohol polymer.
Claim 2
Dependent Claim
49 words
A cellular foam characterized by carbodimide and isocyanurate linkages prepared by catalytically condensing an organic polyisocyanate in the presence of (a) a carbodiimide-promoting catalyst; (b) a trimerization catalyst, and (c) from 5 to 100% by weight, based on the weight of the organic polyisocyanate of a polyfurfuryl alcohol polymer.
Claim 3
Dependent Claim
32 words
The foam of claim 1 wherein the polyfurfuryl alcohol polymer has a Brookfield viscosity at 25° C. of from 500 to 500,000 cps. and a molecular weight of from 196 to 3000.
Claim 4
Dependent Claim
27 words
The foam of claim 1 wherein the organic polyisocyanate is selected from the group consisting of toluene diisocyanate, methylene diphenyl diisocyanate, polyphenyl polymethylene polyisocyanate and mixtures thereof.
Claim 5
Dependent Claim
11 words
The foam of claim 1 wherein the carbodiimide-promoting catalyst is methanol.
Claim 6
Dependent Claim
11 words
The foam of claim 1 wherein the trimerization catalyst is 1,3,5-tris(N,N-dimethylaminopropyl)-s-hexahydrotriazine.
Claim 7
Dependent Claim
38 words
The foam of claim 1 carried out in the presence of from 0.01 to 0.5 equivalent of a polyol having an average functionality of 2 to 8 and an average hydroxyl equivalent of from about 100 to 3000.
Claim 8
Dependent Claim
17 words
The foam of claim 6 carried out in the presence of a catalyst which promotes urethane linkages.
Claim 9
Dependent Claim
18 words
The foam of claim 7 wherein the catalyst which promotes urethane linkages is dibutyltin diacetate or dibutyltin dilaurate.
Claim 10
Dependent Claim
15 words
The foam of claim 1 carried out in the presence of a fluorocarbon blowing agent.
Claim 11
Dependent Claim
13 words
The foam of claim 1 carried out in the presence of tris(2-chloroethyl) phosphate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |