US4632785A
Expired / Lapsed
US
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Thermally activable trimerization catalyst
Assignee: Dow Chemical Co
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Filing: 1985-07-01
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Granted: 1986-12-30
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Expires: 2005-07-01
Abstract
Abstract Disclosed is a method for the trimerization of organic isocyanates comprising thermally activating, in the presence of said isocyanates, a catalyst comprising a carboxylic acid salt selected from the alkali metal salts or quaternary ammonium salts of particular substituted malonic acids of half-esters thereof, particular carbamyl substituted aliphatic acids, or triaryl acetic acids. Mixtures of the catalysts with isocyanates have surprisingly long periods of stability at ambient temperatures (about 20° C.) which makes the present method particularly suitable to systems for molding polyisocyanurates wherein long open times are required of a resin pre-mix prior to the actual curing step.
Inventors
- 👤 Edward A. Barsa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:32
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/1875; C08G18/02; C08G18/022; C08G18/22; C08G18/225; C08G2115/00; C08G2115/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
166 words
A thermally activable organic isocyanate trimerization catalyst comprising a carboxylic acid salt selected from the group consisting of the following formulae ##STR9## wherein R 1 in (Ia) is alkyl having 2 to 8 carbon atoms, inclusive, and each R 1 in (IIa) is independently selected from alkyl having 2 to 8 carbon atoms, inclusive, R 2 is a highly branched alkyl having 3 to 8 carbon atoms, inclusive, R 3 is selected from the group consisting of hydrogen, alkyl and aryl, R 4 is selected from the group consisting of alkyl, aryl, aralkyl, and cycloalkyl, each R 5 is independently selected from aryl, and wherein each one of the four R 6 radicals is independently selected from the group consisting of alkyl, aralkyl, cycloalkyl, and radicals having the formula ##STR10## wherein R 7 is selected from the group consisting of hydrogen and methyl and n is a number of from 1 to 4 provided that no more than one R 6 radical has the formula (IV).
Claim 2
Dependent Claim
166 words
A thermally activable organic isocyanate trimerization catalyst comprising a carboxylic acid salt selected from the group consisting of the following formulae ##STR9## wherein R 1 in (Ia) is alkyl having 2 to 8 carbon atoms, inclusive, and each R 1 in (IIa) is independently selected from alkyl having 2 to 8 carbon atoms, inclusive, R 2 is a highly branched alkyl having 3 to 8 carbon atoms, inclusive, R 3 is selected from the group consisting of hydrogen, alkyl and aryl, R 4 is selected from the group consisting of alkyl, aryl, aralkyl, and cycloalkyl, each R 5 is independently selected from aryl, and wherein each one of the four R 6 radicals is independently selected from the group consisting of alkyl, aralkyl, cycloalkyl, and radicals having the formula ##STR10## wherein R 7 is selected from the group consisting of hydrogen and methyl and n is a number of from 1 to 4 provided that no more than one R 6 radical has the formula (IV).
Claim 3
Dependent Claim
10 words
A salt according to claim 1 having the formula (Ia).
Claim 4
Dependent Claim
10 words
A salt according to claim 2 having the formula ##STR11##
Claim 5
Dependent Claim
10 words
A salt according to claim 1 having the formula (IIa).
Claim 6
Dependent Claim
10 words
A salt according to claim 4 having the formula ##STR12##
Claim 7
Dependent Claim
10 words
A salt according to claim 4 having the formula ##STR13##
Claim 8
Dependent Claim
10 words
A salt according to claim 1 having the formula (IIIa).
Claim 9
Dependent Claim
10 words
A salt according to claim 7 having the formula ##STR14##
References Cited (Backward Citations)
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US3954684A
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US3980594A
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US4040992A
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US4136240A
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US4186255A
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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) | 1989-12-29 | 1990-06-30 | 1990-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-29 | 1994-06-30 | 1994-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-29 | 1998-06-30 | 1998-12-30 | $7700.00 | Window Closed / Lapsed |