US4158087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Urethane foams having low resiliency
Assignee: Hampshire Chemical Corp
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Filing: 1977-05-27
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Granted: 1979-06-12
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Expires: 1997-05-27
Abstract
Abstract Disclosed herein are hydrophilip polyether urethane foams having reduced resiliency and prepared by reacting a polyoxyalkylene urethane prepolymer containing at least 40 mole percent of oxyethylene units; water; and at least about 50 parts, based on the weight of the prepolymer, of a synthetic polymer latex.
Inventors
- 👤 Louis L. Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:17
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G2110/00; C08G2110/0008; C08G2110/0083; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S521/00; Y10S521/905
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
98 words
A flexible hydrophilic polyurethane foam comprising the reaction product of (1) an NCO terminated polyoxyalkylene urethane prepolymer containing at least 40 mole percent of ethylene oxide units in the oxyalkylene portion of the prepolymer, (2) from about 40 to about 150 parts by weight on a solids basis based on 100 parts by weight of said prepolymer of an aqueous latex of a synthetic polymer having a solids content from about 20 to about 65 weight percent and (3) any additional water necessary to obtain a weight ratio of water to prepolymer from about 20 to 250:100 respectively.
Claim 2
Dependent Claim
98 words
A flexible hydrophilic polyurethane foam comprising the reaction product of (1) an NCO terminated polyoxyalkylene urethane prepolymer containing at least 40 mole percent of ethylene oxide units in the oxyalkylene portion of the prepolymer, (2) from about 40 to about 150 parts by weight on a solids basis based on 100 parts by weight of said prepolymer of an aqueous latex of a synthetic polymer having a solids content from about 20 to about 65 weight percent and (3) any additional water necessary to obtain a weight ratio of water to prepolymer from about 20 to 250:100 respectively.
Claim 3
Dependent Claim
14 words
A foam as in claim 1 wherein the latex is a styrene butadiene latex.
Claim 4
Dependent Claim
13 words
A foam as in claim 1 wherein the latex is an acrylic latex.
Claim 5
Dependent Claim
40 words
A foam as in claim 1 wherein the prepolymer is an admixture of polyoxyethylene glycol with a monomeric alcohol having 3 hydroxyl groups per mole and wherein the hydroxyl groups of the glycol and alcohol are capped with a polyisocyanate.
Claim 6
Dependent Claim
11 words
A foam as in claim 4 wherein the alcohol is trimethylolpropane.
Claim 7
Dependent Claim
99 words
The process of preparing flexible hydrophilic polyurethane foams which comprises adding to an NCO terminated polyoxyalkylene urethane prepolymer containing at least 40 mole percent of ethylene oxide units in the oxyalkylene portion of the prepolymer, (1) from about 40 to about 150 parts by weight on a solids basis based on 100 parts by weight of said prepolymer of an aqueous latex of a synthetic polymer having a solids content from about 20 to about 65 weight percent and (2) any additional water necessary to obtain a weight ratio of water to prepolymer from about 20 to 250:100 respectively.
Claim 8
Dependent Claim
99 words
The process of preparing flexible hydrophilic polyurethane foams which comprises adding to an NCO terminated polyoxyalkylene urethane prepolymer containing at least 40 mole percent of ethylene oxide units in the oxyalkylene portion of the prepolymer, (1) from about 40 to about 150 parts by weight on a solids basis based on 100 parts by weight of said prepolymer of an aqueous latex of a synthetic polymer having a solids content from about 20 to about 65 weight percent and (2) any additional water necessary to obtain a weight ratio of water to prepolymer from about 20 to 250:100 respectively.
Claim 9
Dependent Claim
14 words
A process as in claim 6 wherein the latex is a styrene butadiene latex.
Claim 10
Dependent Claim
13 words
A process as in claim 6 wherein the latex is an acrylic latex.
Claim 11
Dependent Claim
40 words
A process as in claim 6 wherein the prepolymer is an admixture of polyoxyethylene glycol with a monomeric alcohol having 3 hydroxyl groups per mole and wherein the hydroxyl groups of the glycol and alcohol are capped with a polyisocyanate.
Claim 12
Dependent Claim
11 words
A process as in claim 4 wherein the alcohol is trimethylolpropane.
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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) | 1982-06-11 | 1982-12-11 | 1983-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-11 | 1986-12-11 | 1987-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-11 | 1990-12-11 | 1991-06-12 | $7700.00 | Window Closed / Lapsed |