Patent US3894972A successfully refreshed from Google Patents.
US3894972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of carbodiimide-isocyanurate foams
Assignee: BASF Corp
•
Filing: 1973-12-21
•
Granted: 1975-07-15
•
Expires: 1993-12-21
Abstract
Abstract Rigid cellular foam compositions characterized by carbodiimide and isocyanurate linkages are prepared by catalytically condensing an organic polyisocyanate in the presence of a catalytically sufficient amount of a co-catalyst system of furfuryl alcohol and a tertiary amine trimerization catalyst.
Inventors
- 👤 Thirumurti L Narayan
- 👤 Moses Cenker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:25
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/02; C08G18/025; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/797; C08G2110/00; C08G2110/0025; C08G2110/0041; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
42 words
A PROCESS FOR HE PEPARATION OF A CELLULAR FOAM CHARACTERIZED BY CARBONIIMIDE AND ISOCYANURATE LINKAGES WHICH COMPRISES CONDENSING AN ORGANIC POLYISOCYANATE IN THE PRESENCE OF A CATALYTICALLY SUFFICIENT AMOUNT OF A CATALYST SYSTEM COMPRISING FURFURYL ALCOHOL AND A TERTIARY AMINE TRIMERIZATION CATALYST.
Claim 2
Dependent Claim
42 words
A PROCESS FOR HE PEPARATION OF A CELLULAR FOAM CHARACTERIZED BY CARBONIIMIDE AND ISOCYANURATE LINKAGES WHICH COMPRISES CONDENSING AN ORGANIC POLYISOCYANATE IN THE PRESENCE OF A CATALYTICALLY SUFFICIENT AMOUNT OF A CATALYST SYSTEM COMPRISING FURFURYL ALCOHOL AND A TERTIARY AMINE TRIMERIZATION CATALYST.
Claim 3
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 4
Dependent Claim
11 words
The process of claim 1 wherein the tertiary amine is 1,3,5-tris(N,N-dimethylaminopropyl)-s-hexahydrotriazine.
Claim 5
Dependent Claim
38 words
The process 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 6
Dependent Claim
17 words
The process of claim 4 carried out in the presence of a catalyst which promotes urethane linkages.
Claim 7
Dependent Claim
18 words
The process of claim 5 wherein the catalyst which promotes urethane linkages is dibutyltin diacetate or dibutyltin dilaurate.
Claim 8
Dependent Claim
15 words
The proceSs of claim 1 carried out in the presence of a fluorocarbon blowing agent.
Claim 9
Dependent Claim
13 words
The process of claim 1 carried out in the presence of tris(2-chloroethyl) phosphate.
References Cited (Backward Citations)
US3168483A
Cited
US3657161A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |