Patent US4826882A successfully refreshed from Google Patents.
US4826882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Open celled polyurethane foams
Assignee: PMC Inc
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Filing: 1988-04-15
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Granted: 1989-05-02
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Expires: 2008-04-15
Abstract
Abstract Improved, flexible, open celled polyurethane foams are described. The foams are formed in situ from the reaction of a polyisocyanate, a conventional polyester polyol, a polyether polyol, a high hydroxyl polyester polyol and a blowing agent in the presence of a catalyst. A polyether foam stabilizer is normally also included. A small amount of a destabilizing silicone ingredient can also be included. Useful high hydroxyl number polyester polyols have hydroxyl numbers in the range 300-600, and preferably 400-450. The average equivalent weight of the useful high hydroxyl number polyester polyol is normally in the range 100-200. The compositions of the invention are useful as filter media and are especially suitable for outdoor seating applications.
Inventors
- 👤 Charles W. Bredbenner
- 👤 Richard Rupp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:10
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/4009; C08G18/4018; C08G18/30; C08G18/32; C08G18/3203; C08G18/3221; C08G18/42; C08G18/4202; C08G18/65; C08G18/66; C08G18/6603; C08G18/6607; C08G2110/00; C08G2110/0008; C08G2340/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
90 words
An improved flexible, open celled polyurethane foam produced in situ from the reaction in the presence of a catalyst of a polyisocyanate, a blowing agent, a polyether foam stabilizer and a polyol mixture comprising about 70-90% by weight of a conventional polyester polyol, about 5-15% by weight of a polyether polyol and about 5-15 by weight of a high hydroxyl number polyester polyol additive, wherein the hydroxyl number of the conventional polyester polyol is about 35-150 and the hydroxyl number of the high hydroxyl number polylester polyol is about 300-600.
Claim 2
Dependent Claim
90 words
An improved flexible, open celled polyurethane foam produced in situ from the reaction in the presence of a catalyst of a polyisocyanate, a blowing agent, a polyether foam stabilizer and a polyol mixture comprising about 70-90% by weight of a conventional polyester polyol, about 5-15% by weight of a polyether polyol and about 5-15 by weight of a high hydroxyl number polyester polyol additive, wherein the hydroxyl number of the conventional polyester polyol is about 35-150 and the hydroxyl number of the high hydroxyl number polylester polyol is about 300-600.
Claim 3
Dependent Claim
34 words
The foam of claim 1 which has an enhanced IFD value as compared to foam having more than 5-15% by weight of a polyether polyol but having substantially no high hydroxyl number polyester polyol.
Claim 4
Dependent Claim
11 words
The foam of claim 1 wherein the polyisocyanate is tolylene diisocyanate.,
Claim 5
Dependent Claim
25 words
The foam of claim 1 wherein the high hydroxyl number polyester polyol comprises the reaction products of carboxylic acids and at least one polyhydric alcohol.
Claim 6
Dependent Claim
21 words
The foam of claim 4 wherein the hydroxyl number of the high hydroxyl number polyester polyol is in the range 400-450.
Claim 7
Dependent Claim
34 words
The foam of claim 5 which has an enhanced IFD value as compared to foam having more than 5-15% by weight of a polyether polyol but having substantially no high hydroxyl number polyester polyol.
Claim 8
Dependent Claim
19 words
The foam of claim 1 which also comprises up to about 0.25% by weight of a destabilizing silicone ingredient.
Claim 9
Dependent Claim
39 words
The foam of claim 1 wherein the polyol mixture comprises about 80-85% by weight of conventional polyester polyol, about 5-10% by weight of a polyether polyol and about 5-7.5% by weight of a high hydroxyl number polyester polyol additive.
Claim 10
Dependent Claim
11 words
The foam of claim 8 wherein the polyisocyanate is tolylene diisocyanate.
Claim 11
Dependent Claim
25 words
The foam of claim 8 wherein the high hydroxyl number polyester polyol comprises the reaction products of carboxylic acids and at least one polyhydric alcohol.
Claim 12
Dependent Claim
21 words
The foam of claim 10 wherein the hydroxyl number of the high hydroxyl number polyester polyol is in the range 400-450.
Claim 13
Dependent Claim
34 words
The foam of claim 11 which has an enhanced IFD value as compared to foam having more than 5-15% by weight of a polyether polyol but having substantially no high hydroxyl number polyester polyol.
Claim 14
Dependent Claim
19 words
The foam of claim 8 which also comprises up to about 0.25% by weight of a destabilizing silicone ingredient.
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) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |