US3723366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbodiimide foams and improved process for preparing same
Assignee: BASF Corp
•
Filing: 1971-06-25
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Granted: 1973-03-27
•
Expires: 1991-06-25
Abstract
Abstract Rigid foam compositions characterized by carbodiimide linkages are prepared from the catalytic condensation of an organic polyisocyanate in the presence of a co-catalyst system consisting essentially of a mixture of 2,4,6-tris (dialkanolamino)-striazine and 1,3,5-tris(N,N-dialkylaminoalkyl)-shexahydrotriazine.
Inventors
- 👤 P Kan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:47
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/20; C08G18/2009; C08G18/2036; C08G18/02; C08G18/025; C08G18/09; C08G18/095; C08G18/10; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S521/00; Y10S521/901
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
30 words
The process of claim 1 wherein the co-catalyst system is present in a weight ratio of from 0.1 to 10 parts of co-catalyst system per 100 parts of organic polyisocyanate.
Claim 2
Dependent Claim
27 words
The process of claim 2 wherein the co-catalyst system is employed in a weight ratio of hexahydrotriazine catalyst to triazine catalyst ranging from about 1:7 to 7:1.
Claim 3
Dependent Claim
20 words
The process of claim 3 wherein the 2,4,6-tris(dialkanolamino)-s-triazine is selected from the group consisting of 2,4,6-tris(diethanolamino)-s-triazine, 2,4,6-tris(diisopropanolamino)-s-triazine, and mixtures thereof.
Claim 4
Dependent Claim
10 words
The process of claim 3 wherein the 2,4,6-tris(dialkanolamino)-s-triazine is 2,4,6-tris(diethanolamino)-s-triazine.
Claim 5
Dependent Claim
10 words
The process of claim 3 wherein the 1,3,5-tris(N,N-dialkylaminoalkyl)-s-hexahydrotriazine is 1,3,5-tris(N,N-dimethyl-3-aminopropyl)-s-hexahydrotriazine.
Claim 6
Dependent Claim
48 words
The process of claim 1 wherein the organic polyisocyanate is represented by the formula: R(NCO)z wherein R is a polyvalent organic radical selected from the group consisting of aliphatic and aromatic radicals and z is an integer corresponding to the valence of R and is at least 2.
Claim 7
Dependent Claim
30 words
The process of claim 7 wherein the organic polyisocyanate is selected from the group consisting of toluene diisocyanate, methylene diphenyl diisocyanate, xylylene diisocyanate, lysine diisocyanate methyl ester and mixtures thereof.
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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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |