Patent US3887501A successfully refreshed from Google Patents.
US3887501A
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Process for the preparation of carbodiimide-isocyanurate foams
Assignee: BASF Corp
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Filing: 1973-12-21
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Granted: 1975-06-03
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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 sufficient amount of a co-catalyst system of methanol and a tertiary amine trimerization catalyst.
Inventors
- 👤 Thirumurti L Narayan
- 👤 Moses Cenker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:19
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; Y10S521/901; Y10S521/902
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
60 words
A PROCESS FOR THE PREPARATION OF A CELLULAR FOAM CHARACTERIZED BY CARBODIIMIDE AND ISOCYANURATE LINKAGES WHICH COMPRISES CONDENSING AN ORGANIC POLYISOCYANATE IN THE PRESENCE OF A CATALYTICALLY SUFFICIENT AMOUNT OF A CATALYST SYSTEM CONSISTING ESSENTIALLY OF METHANOL AND A TERIARY AMINE TRIMERIZATION CATALYST SELECTED FROM THE GROUP CONSISTING OF 1,3,5TRIS(N,N-DIALKYLAMINOALKYL)-S- HEXAHYDROTRIAZINES, THE ALKYLENE OXIDE AND WATER ADDUCTS THEREOF, AND 2,4,6TRIS(DIMETHYLAMINOMETHYL)PHENOL.
Claim 2
Dependent Claim
60 words
A PROCESS FOR THE PREPARATION OF A CELLULAR FOAM CHARACTERIZED BY CARBODIIMIDE AND ISOCYANURATE LINKAGES WHICH COMPRISES CONDENSING AN ORGANIC POLYISOCYANATE IN THE PRESENCE OF A CATALYTICALLY SUFFICIENT AMOUNT OF A CATALYST SYSTEM CONSISTING ESSENTIALLY OF METHANOL AND A TERIARY AMINE TRIMERIZATION CATALYST SELECTED FROM THE GROUP CONSISTING OF 1,3,5TRIS(N,N-DIALKYLAMINOALKYL)-S- HEXAHYDROTRIAZINES, THE ALKYLENE OXIDE AND WATER ADDUCTS THEREOF, AND 2,4,6TRIS(DIMETHYLAMINOMETHYL)PHENOL.
Claim 3
Dependent Claim
60 words
A process for the preparation of a cellular foam characterized by carbodiimide and isocyanurate linkages which comprises condensing an organic polyisocyanate in the presence of a catalytically sufficient amount of a catalyst system consisting essentially of methanol and a tertiary amine trimerization catalyst selected from the group consisting of 1,3,5-tris(N,N-dialkylaminoalkyl)-s- hexahydrotriazines, the alkylene oxide and water adducts thereof, and 2,4,6-tris(dimethylaminomethyl)phenol.
Claim 4
Dependent Claim
60 words
A process for the preparation of a cellular foam characterized by carbodiimide and isocyanurate linkages which comprises condensing an organic polyisocyanate in the presence of a catalytically sufficient amount of a catalyst system consisting essentially of methanol and a tertiary amine trimerization catalyst selected from the group consisting of 1,3,5-tris(N,N-dialkylaminoalkyl)-s- hexahydrotriazines, the alkylene oxide and water adducts thereof, and 2,4,6-tris(dimethylaminomethyl)phenol.
Claim 5
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 6
Dependent Claim
11 words
The process of claim 1 wherein the tertiary amine is 1,3,5-tris(N,N-dimethylaminopropyl)-s-hexahydrotriazine.
Claim 7
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 a average functionality of 2 to 8 and an average hydroxyl equivalent of from about 100 to 3000.
Claim 8
Dependent Claim
17 words
The process of claim 4 carried out in the presence of a catalyst which promotes urethane linkages.
Claim 9
Dependent Claim
18 words
The process of claim 5 wherein the catalyst which promotes urethane linkages is dibutyltin diacetate or dibutyltin dilaurate.
Claim 10
Dependent Claim
15 words
The process of claim 1 carried out in the presence of a fluorocarbon blowIng agent.
References Cited (Backward Citations)
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US3620986A
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US3645923A
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US3723364A
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US3723366A
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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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |