US4764541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyurethane foams in the presence of a polyether acid
Assignee: Dow Chemical Co
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Filing: 1988-01-21
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Granted: 1988-08-16
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Expires: 2008-01-21
Abstract
Abstract A flexible polyurethane foam formulation which is non-reactive at or near ambient temperature is provided. The formulation comprises a polyisocyanate, a polyfunctional active hydrogen containing compound, an amine catalyst, a blowing agent and a polyether acid. The formulation which becomes reactive above 40° C. has the advantage, over similar systems based on formic acid, that the polyurethane foam is not tight and does not suffer from skin peeling.
Inventors
- 👤 Robert D. Brasington
- 👤 Werner A. Lidy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:10
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/1875; C08G18/089; C08G18/28; C08G18/2805; C08G18/281; C08G18/65; C08G18/6541
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
61 words
A process for preparing a flexible polyurethane foam which process comprises (1) preparing a polyurethane foam formulation by mixing a polyisocyanate, a polyfunctional active hydrogen containing compound, an amine catalyst, a blowing agent and a polyether acid at ambient temperature; and (2) thereafter foaming the polyurethane foam formulation in a mould at a temperature in the range 40° to 60° C.
Claim 2
Dependent Claim
61 words
A process for preparing a flexible polyurethane foam which process comprises (1) preparing a polyurethane foam formulation by mixing a polyisocyanate, a polyfunctional active hydrogen containing compound, an amine catalyst, a blowing agent and a polyether acid at ambient temperature; and (2) thereafter foaming the polyurethane foam formulation in a mould at a temperature in the range 40° to 60° C.
Claim 3
Dependent Claim
19 words
A process as claimed in claim 1 wherein the polyurethane foam formulation is cured and demoulded after step (2).
Claim 4
Dependent Claim
101 words
The process as claimed in claim 1 wherein the polyether acid is selected from the group consisting of CH 3 OCH 2 CH 2 OCH 2 CO 2 H, CH 3 O(CH 2 CH 2 O) 2 CH 2 CO 2 H, HO 2 CCH 2 O(CH 2 CH 2 O) 2 CH 2 CO 2 H, HO 2 CCH 2 O(CH 2 CH 2 O) p CH 2 CO 2 H (p=10-12), HOCH 2 CH 2 O(CH 2 CH 2 O) q CH 2 CH 2 CO 2 H (q=1-20) and HOCH 2 CH 2 OCH 2 CO 2 H.
Claim 5
Dependent Claim
28 words
The process as claimed in claim 1 wherein the polyether acid is HO 2 CCH 2 O(CH 2 CH 2 O) p CH 2 CO 2 H (p=10-12).
Claim 6
Dependent Claim
35 words
The process as claimed in claim 1 wherein the polyether acid is present in amounts such that the number of carboxylic acid groups present comprise between 10 and 80 mole % of the amine catalyst.
References Cited (Backward Citations)
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US4452924A
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US4569952A
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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) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |