Patent US4110270A successfully refreshed from Google Patents.
US4110270A
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US
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Process for the preparation of foams characterized by isocyanurate and urethane linkages
Assignee: BASF Corp
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Filing: 1977-05-05
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Granted: 1978-08-29
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Expires: 1997-05-05
Abstract
Abstract Foams characterized by isocyanurate and urethane linkages are prepared by condensing: (a) an organic polyisocyanate with a polyol or (b) a quasi-prepolymer in the presence of a blowing agent and a catalytically effective amount of an alkali metal salt of an organic sulfinic acid. The catalysts of the invention offer the advantages of longer cream times and fully cured foams in acceptable times thus finding particular utility in pour-in-place and slab stock foaming applications.
Inventors
- 👤 Thirumurti Narayan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:58
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/22; C08G18/225; C08G18/10; C08G2115/00; C08G2115/02; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
54 words
In a process for the preparation of a pour-in-place urethane-modified isocyanurate foam by the reaction of an organic polyisocyanate with a primary hydroxyterminated polyol in the presence of a blowing agent and a trimerization catalyst the improvement which comprises employing as catalyst for the reaction an alkali metal salt of toluene- or benzenesulfinic acid.
Claim 2
Dependent Claim
54 words
In a process for the preparation of a pour-in-place urethane-modified isocyanurate foam by the reaction of an organic polyisocyanate with a primary hydroxyterminated polyol in the presence of a blowing agent and a trimerization catalyst the improvement which comprises employing as catalyst for the reaction an alkali metal salt of toluene- or benzenesulfinic acid.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the alkali metal salt is sodium benzenesulfinate.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein the alkali metal salt is potassium benzenesulfinate.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein the alkali metal salt is sodium toluenesulfinate.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein the organic polyisocyanate is diphenylmethane diisocyanate.
Claim 7
Dependent Claim
17 words
The process of claim 1 wherein the polyol is an ethylene oxide adduct of a polyhydric alcohol.
Claim 8
Dependent Claim
11 words
The process of claim 6 wherein the polyhydric alcohol is trimethylolpropane.
Claim 9
Dependent Claim
12 words
The process of claim 1 wherein the blowing agent is a fluorocarbon.
References Cited (Backward Citations)
US3628872A
Cited
US3943075A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |