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Process for the preparation of carbodiimide-isocyanurate foams
Assignee: BASF Corp
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Filing: 1977-12-05
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Granted: 1979-08-28
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Expires: 1997-12-05
Abstract
Abstract Rigid foams characterized by carbodiimide and isocyanurate linkages are prepared by catalytically condensing an organic polyisocyanate in the presence of (a) a carbodiimide-promoting compound and (b) certain C 1 -C 8 alkali metal carboxylates as trimerization catalysts.
Inventors
- 👤 Moses Cenker
- 👤 Thirumurti Narayan
- 👤 Harald P. Wulff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:07
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/09; C08G18/095; C08G18/02; C08G18/025; C08G2110/00; C08G2110/0025; C08G2110/0041; C08G2110/0083; Y; Y10; Y10S; Y10S521/00; Y10S521/901; Y10S521/902; Y10S521/903
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
46 words
A process for the preparation of foams characterized by carbodiimide and isocyanurate linkages comprising catalytically condensing an organic polyisocyanate in the presence of a catalytically sufficient amount of (a) a compound which promotes the carbodiimide reaction and (b) a C 1 -C 8 alkali metal carboxylate.
Claim 2
Dependent Claim
46 words
A process for the preparation of foams characterized by carbodiimide and isocyanurate linkages comprising catalytically condensing an organic polyisocyanate in the presence of a catalytically sufficient amount of (a) a compound which promotes the carbodiimide reaction and (b) a C 1 -C 8 alkali metal carboxylate.
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein (b) is potassium acetate.
Claim 4
Dependent Claim
10 words
The process of claim 1 wherein (b) is potassium formate.
Claim 5
Dependent Claim
10 words
The process of claim 1 wherein (b) is potassium 2-ethylhexanoate.
Claim 6
Dependent Claim
27 words
The process 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 7
Dependent Claim
14 words
The process of claim 1 wherein the carbodiimide-promoting catalyst is furfuryl alcohol or methanol.
Claim 8
Dependent Claim
11 words
The process of claim 1 wherein the carbodiimide-promoting catalyst is 2,4-bis(diethylamino)-6-N-methylethanolamino-s-triazine.
Claim 9
Dependent Claim
47 words
The process of claim 1 carried out in the presence of from 5% to 70% by weight based on the weight of the organic polyisocyanate of a polyol having an average functionality of 2 to 8 and an average hydroxyl equivalent of from about 100 to 1500.
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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) | 1982-08-27 | 1983-02-26 | 1983-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-27 | 1987-02-26 | 1987-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-27 | 1991-02-26 | 1991-08-28 | $7700.00 | Window Closed / Lapsed |