US4092276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of foams characterized by isocyanurate and urethane linkages
Assignee: BASF Corp
•
Filing: 1977-03-10
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Granted: 1978-05-30
•
Expires: 1997-03-10
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 phosphinic 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
2026-10-27 09:15
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: 10
Claim 1
Independent Claim
48 words
A process for preparation of foams characterized by isocyanurate and urethane linkages comprising condensing (a) an organic polyisocyanate with a polyol or (b) an isocyanate-terminated quasi-prepolymer in the presence of a blowing agent and a catalytically effective amount of an alkali metal salt of an organic phosphinic acid.
Claim 2
Dependent Claim
48 words
A process for preparation of foams characterized by isocyanurate and urethane linkages comprising condensing (a) an organic polyisocyanate with a polyol or (b) an isocyanate-terminated quasi-prepolymer in the presence of a blowing agent and a catalytically effective amount of an alkali metal salt of an organic phosphinic acid.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the alkali metal salt is sodium benzene phosphinate.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein the alkali metal salt is potassium benzene phosphinate.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the organic polyisocyanate is diphenylmethane diisocyanate.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein the organic polyisocyanate is toluene 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
16 words
The process of claim 1 wherein the polyol is an ethylene oxide adduct of toluene diamine.
Claim 10
Dependent Claim
12 words
The process of claim 1 wherein the blowing agent is a fluorocarbon.
References Cited (Backward Citations)
US2926147A
Cited
US3450669A
Cited
FR1391335A
Cited
US3476933A
Cited
US3634345A
Cited
US3637587A
Cited
US3624179A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |