US4124545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbamic acid esters as catalysts for trimerization of isocyanates
Assignee: Bayer AG
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Filing: 1977-06-22
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Granted: 1978-11-07
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Expires: 1997-06-22
Abstract
Abstract Novel compounds which upon heating are converted into the corresponding phenol which is a catalyst for the trimerization of compounds having isocyanato groups to form isocyanurates have the formula: ##STR1## in which N REPRESENTS AN INTEGER OF FROM 1 TO 4 A represents an aromatic hydrocarbon group obtained by removing the NCO group from a monomeric aromatic monoisocyanate containing 6 - 14 carbon atoms, R 1 and R 2 may be the same or different and represent a C 1 to C 6 alkyl group or a polymethylene chain containing 4 to 8 carbon atoms which together with the nitrogen atom form a heterocyclic ring, R 3 may be hydrogen, chlorine, bromine or a C 1 - C 18 -alkyl group.
Inventors
- 👤 Jurgen Hocker
- 👤 Hans-Joachim Diehr
- 👤 Rudolf Merten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:02
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/02; C08G18/022; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
A process for trimerizing a compound having isocyanato groups to form an isocyanurate which comprises heating a compound having isocyanato groups and a catalytic amount of a compound of the general formula ##STR13## in which n represents an integer of from 1 to 4 R 1 and R 2 may be the same or different and represent a C 1 to C 6 alkyl group or a polymethylene chain containing 4 to 8 carbon atoms which together with the nitrogen atom form a heterocyclic ring, R 3 may be hydrogen, chlorine, bromine or a C 1 -C 18 -alkyl group, and A represents a monovalent group obtained by removing the NCO groups from a monomeric aromatic monoisocyanate containing 6 to 14 carbon atoms, an aliphatic hydrocarbon radical having 1 to 18 carbon atoms, or a cycloaliphatic hydrocarbon radical having 5 to 10 carbon atoms to a temperature above the point where the blocked phenol dissociates into the corresponding phenol.
Claim 2
Dependent Claim
159 words
A process for trimerizing a compound having isocyanato groups to form an isocyanurate which comprises heating a compound having isocyanato groups and a catalytic amount of a compound of the general formula ##STR13## in which n represents an integer of from 1 to 4 R 1 and R 2 may be the same or different and represent a C 1 to C 6 alkyl group or a polymethylene chain containing 4 to 8 carbon atoms which together with the nitrogen atom form a heterocyclic ring, R 3 may be hydrogen, chlorine, bromine or a C 1 -C 18 -alkyl group, and A represents a monovalent group obtained by removing the NCO groups from a monomeric aromatic monoisocyanate containing 6 to 14 carbon atoms, an aliphatic hydrocarbon radical having 1 to 18 carbon atoms, or a cycloaliphatic hydrocarbon radical having 5 to 10 carbon atoms to a temperature above the point where the blocked phenol dissociates into the corresponding phenol.
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) | 1981-11-06 | 1982-05-08 | 1982-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-06 | 1986-05-08 | 1986-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-06 | 1990-05-08 | 1990-11-07 | $7700.00 | Window Closed / Lapsed |