Patent US4067830A successfully refreshed from Google Patents.
US4067830A
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US
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Catalytic trimerization of polyisocyanates
Assignee: Ashland LLC
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Filing: 1976-03-29
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Granted: 1978-01-10
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Expires: 1996-03-29
Abstract
Abstract Compounds (aminimides) of the class wherein a negatively charged nitrogen atom of an acylamide is directly bonded to a cationic nitrogen atom having one hydroxyethyl and two methyl substituents represent uniquely effective catalysts for the trimerization of the isocyanate radical. These aminimides are especially useful as catalysts for the preparation of rigid polyisocyanate-polyisocyanurate foams.
Inventors
- 👤 Jiri E. Kresta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:22
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/166; C08G18/168; C08G18/18; C08G18/1825; C08G2115/00; C08G2115/02; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
In a process for preparing rigid polyisocyanurate-polyurethane foam by the catalyzed reaction of a polyol with an excess of polyisocyanate; the improvement of effecting said reaction in the presence of a catalytic amount of an aminimide having the formula: ##STR3##wherein n is the integer 1 or 2; R is C 2 -C 8 alkylene when n is 2; and R is C 1 -C 18 alkyl, methoxymethylene or phenyl when n is 1.
Claim 2
Dependent Claim
73 words
In a process for preparing rigid polyisocyanurate-polyurethane foam by the catalyzed reaction of a polyol with an excess of polyisocyanate; the improvement of effecting said reaction in the presence of a catalytic amount of an aminimide having the formula: ##STR3##wherein n is the integer 1 or 2; R is C 2 -C 8 alkylene when n is 2; and R is C 1 -C 18 alkyl, methoxymethylene or phenyl when n is 1.
Claim 3
Dependent Claim
13 words
The improvement in accordance with claim 1 wherein said aminimide is bis(dimethylethanolamine) azelaylimide.
Claim 4
Dependent Claim
13 words
The improvement in accordance with claim 1 wherein said aminimide is dimethylethanolamine acetylimide.
Claim 5
Dependent Claim
13 words
The improvement in accordance with claim 1 wherein said aminimide is dimethylethanolamine propionylimide.
Claim 6
Dependent Claim
13 words
The improvement in accordance with claim 1 wherein said aminimide is dimethylethanolamine methoxyacetylimide.
Claim 7
Dependent Claim
13 words
The improvement in accordance with claim 1 wherein said aminimide is dimethylethanolamine benzimide.
Claim 8
Dependent Claim
40 words
The improvement in accordance with claim 1 wherein said aminimide is employed in conjunction with an alkali metal salt of a mono-carboxylic acid on the basis of 1-100 parts by weight thereof per 100 parts by weight of the aminimide.
Claim 9
Dependent Claim
13 words
The improvement in accordance with claim 7 wherein said alkali metal is potassium.
Claim 10
Dependent Claim
14 words
The improvement in accordance with claim 8 wherein said monocarboxylic acid is 2-ethylhexanoic acid.
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) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |