Patent US3919218A successfully refreshed from Google Patents.
US3919218A
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US
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Stable polyisocyanates and process therefor
Assignee: Veba Oel AG
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Filing: 1974-05-20
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Granted: 1975-11-11
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Expires: 1994-05-20
Abstract
Abstract or WHEREIN R is Isocyanato isocyanurate solutions are prepared by the trimerization of aliphatic or cycloaliphatic isocyanates with aziridine or its derivatives as catalyst and trialkylamines with 1-5 carbon atoms in the alkyl groups as co-catalyst in the presence or absence of organic solvents and terminating the polymerization by destroying said catalyst by thermic treatment at temperatures between 80* and 200*C, and simultaneously or subsequently separating said co-catalyst by distillation. Isocyanato isocyanurates having the formula
Inventors
- 👤 Karl Schmitt
- 👤 Josef Disteldorf
- 👤 Felix Schmitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:06
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/02; C08G18/022
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
62 words
METHOD FOR PREPARING STABLE ISOCYANATO ISOCYANURATE WHICH COMPRISES TRIMERIZING ALKYL OR CYCLOALKYL ISOCYANATES HAVING 4-18 CARBON ATOMS WITH AZIRIDINE OR SUBSTITUTED AZIRIDINES AS CATALYST AND TRIALKYLAMINES WITH 1-5 CARBON ATOMS IN THE ALKYL GROUPS AS CO-CATALYST AND TERMINATING THE POLYMERIZATION BY DESTROYING SAID CATALYST BY THERMIC TREATMENT AT TEMPERATURES BETWEEN 80* AND 200*C, AND SIMULTANEOUSLY OR SUBSEQUENTLY SEPARATING SAID CO-CATALYST BY DISTILLATION.
Claim 2
Dependent Claim
62 words
METHOD FOR PREPARING STABLE ISOCYANATO ISOCYANURATE WHICH COMPRISES TRIMERIZING ALKYL OR CYCLOALKYL ISOCYANATES HAVING 4-18 CARBON ATOMS WITH AZIRIDINE OR SUBSTITUTED AZIRIDINES AS CATALYST AND TRIALKYLAMINES WITH 1-5 CARBON ATOMS IN THE ALKYL GROUPS AS CO-CATALYST AND TERMINATING THE POLYMERIZATION BY DESTROYING SAID CATALYST BY THERMIC TREATMENT AT TEMPERATURES BETWEEN 80* AND 200*C, AND SIMULTANEOUSLY OR SUBSEQUENTLY SEPARATING SAID CO-CATALYST BY DISTILLATION.
Claim 3
Dependent Claim
13 words
Method of claim 1 carried out in the presence of an organic solvent.
Claim 4
Dependent Claim
10 words
Method of claim 1 wherein the isocyanate is trimethylhexamethylene diisocyanate.
Claim 5
Dependent Claim
9 words
Method of claim 1 wherein the isocyanate is 3-isocyanatomethyl-3,5,5-trimethylcyclohexylisocyanate.
Claim 6
Dependent Claim
5 words
Isocyanato isocyanurate having the formula:
Claim 7
Dependent Claim
5 words
Isocyanato isocyanurate having the formula:
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |