US4137200A
Expired / Lapsed
US
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Crosslinked hydrophilic foams and method
Assignee: Hampshire Chemical Corp
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Filing: 1977-06-10
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Granted: 1979-01-30
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Expires: 1997-06-10
Abstract
Abstract The invention disclosed is for new improved hydrophilic crosslinked polyurethane foams prepared by reacting a blend of a monomeric polyol and polyoxyalkylene glycol (the -OH groups of said blend being capped with a polyisocyanate) with large amounts of an aqueous reactant. The resultant foams may be characterized with a broad spectrum of improved properties including hydrolytic stability and tensile strength.
Inventors
- 👤 Louis L. Wood
- 👤 Kurt C. Frisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:46
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/72; A61K8/84; A61K8/87; A61K6/00; A61K6/80; A61K6/884; A61K6/891; A61K6/893; A61K8/02; A61K8/0208; A61K9/00; A61K9/0012; A61K9/0034; A61K9/0036; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/425; A61Q; A61Q19/00; C; C02; C02F; C02F3/00; C02F3/02; C02F3/10; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; C08G18/6677; C08G2110/00; C08G2110/0083; C08G2310/00; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S521/00; Y10S521/905
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
119 words
A crosslinked hydrophilic foam having a three-dimensional network comprising the reaction product of A. isocyanate capped prepolymers consisting of a mixture of (1) an isocyanate capped hydrophilic polyoxyethylene diol, said diol having an ethylene oxide content of at least 40 mole percent; and (2) an isocyanate capped polyol having a hydroxyl functionality in the range 3 to 8 prior to capping; said isocyanate capped polyol being present in an amount in the range 2.9 to 50% by weight of (1) and (2); B. 3.2 to 7.9% by weight of A and B of a polyisocyanate having an isocyanate functionality in the range 2.0 to 2.8; and C. 6.5 to 390 moles of water for each mole of unreacted isocyanate.
Claim 2
Dependent Claim
119 words
A crosslinked hydrophilic foam having a three-dimensional network comprising the reaction product of A. isocyanate capped prepolymers consisting of a mixture of (1) an isocyanate capped hydrophilic polyoxyethylene diol, said diol having an ethylene oxide content of at least 40 mole percent; and (2) an isocyanate capped polyol having a hydroxyl functionality in the range 3 to 8 prior to capping; said isocyanate capped polyol being present in an amount in the range 2.9 to 50% by weight of (1) and (2); B. 3.2 to 7.9% by weight of A and B of a polyisocyanate having an isocyanate functionality in the range 2.0 to 2.8; and C. 6.5 to 390 moles of water for each mole of unreacted isocyanate.
Claim 3
Dependent Claim
11 words
A foam as in claim 1 wherein the polyol is trimethylolpropane.
Claim 4
Dependent Claim
11 words
A foam as in claim 1 wherein the polyol is glycerol.
Claim 5
Dependent Claim
11 words
A foam as in claim 1 wherein the polyol is pentaerythritol.
Claim 6
Dependent Claim
163 words
The process of forming a crosslinked hydrophilic urethane foam which comprises admixing a hydrophilic polyoxyethylene diol having an ethylene oxide content of at least 40 mole percent with a polyol having a hydroxyl functionality in the range 3 to 8, said polyol being present in the admixture in an amount in the range 1.0 to 20% by weight, reacting with the admixture at a temperature in the range 0 to 120° C. an amount of a polyisocyanate having an isocyanate functionality in the range 2.0 to 2.8 equal to 1.8-1.9 NCO to OH equivalents for a time sufficient to cap substantially all the hydroxyl groups of the admixture, adding additional polyisocyanate having an isocyanate functionality in the range 2.0 to 2.8 to provide 0.1-0.3 equivalents of NCO per initial equivalent of OH in excess of the theoretical amount necessary to react with the hydroxyl groups and thereafter adding 6.9 to 390 moles of water for each mole of unreacted isocyanate in the admixture.
Claim 7
Dependent Claim
163 words
The process of forming a crosslinked hydrophilic urethane foam which comprises admixing a hydrophilic polyoxyethylene diol having an ethylene oxide content of at least 40 mole percent with a polyol having a hydroxyl functionality in the range 3 to 8, said polyol being present in the admixture in an amount in the range 1.0 to 20% by weight, reacting with the admixture at a temperature in the range 0 to 120° C. an amount of a polyisocyanate having an isocyanate functionality in the range 2.0 to 2.8 equal to 1.8-1.9 NCO to OH equivalents for a time sufficient to cap substantially all the hydroxyl groups of the admixture, adding additional polyisocyanate having an isocyanate functionality in the range 2.0 to 2.8 to provide 0.1-0.3 equivalents of NCO per initial equivalent of OH in excess of the theoretical amount necessary to react with the hydroxyl groups and thereafter adding 6.9 to 390 moles of water for each mole of unreacted isocyanate in the admixture.
Claim 8
Dependent Claim
11 words
A method as in claim 5 wherein the polyol is trimethylolpropane.
Claim 9
Dependent Claim
11 words
A method as in claim 5 wherein the polyol is glycerol.
Claim 10
Dependent Claim
11 words
A method as in claim 5 wherein the polyol is pentaerythritol.
Claim 11
Dependent Claim
97 words
A crosslinkable hydrophilic urethane foam forming composition upon the addition of an aqueous reactant comprising (1) a isocyanate capped hydrophilic polyoxyethylene diol, said diol having an ethylene oxide content of at least 40 mole percent; (2) an isocyanate capped polyol having a hydroxyl functionality in the range 3 to 8 prior to capping; said isocyanate capped polyol being present in an amount in the range 2.9 to 50% by weight of (1) and (2); and (3) 3.2 to 7.9% by weight of the composition of a polyisocyanate having an isocyanate functionality in the range 2.0 to 2.8.
Claim 12
Dependent Claim
97 words
A crosslinkable hydrophilic urethane foam forming composition upon the addition of an aqueous reactant comprising (1) a isocyanate capped hydrophilic polyoxyethylene diol, said diol having an ethylene oxide content of at least 40 mole percent; (2) an isocyanate capped polyol having a hydroxyl functionality in the range 3 to 8 prior to capping; said isocyanate capped polyol being present in an amount in the range 2.9 to 50% by weight of (1) and (2); and (3) 3.2 to 7.9% by weight of the composition of a polyisocyanate having an isocyanate functionality in the range 2.0 to 2.8.
Claim 13
Dependent Claim
149 words
The process of forming a crosslinkable hydrophilic urethane foam forming composition which comprises admixing a hydrophilic polyoxyethylene diol having an ethylene oxide content of at least 40 mole percent with a polyol having a hydroxyl functionality in the range 3 to 8, said polyol being present in the admixture in an amount in the range 1.0 to 20% by weight, reacting with the admixture at a temperature in the range 0 to 120° C. an amount of a polyisocyanate having an isocyanate functionality in the range 2.0 to 2.8 equal to 1.8-1.9 NCO to OH equivalents for a time sufficient to cap substantially all the hydroxyl groups of the admixture and thereafter adding additional polyisocyanate having an isocyanate functionality in the range 2.0 to 2.8 to provide 0.1-0.3 equivalents of NCO per initial equivalent of OH in excess of the theoretical amount necessary to react with the hydroxyl groups.
Claim 14
Dependent Claim
149 words
The process of forming a crosslinkable hydrophilic urethane foam forming composition which comprises admixing a hydrophilic polyoxyethylene diol having an ethylene oxide content of at least 40 mole percent with a polyol having a hydroxyl functionality in the range 3 to 8, said polyol being present in the admixture in an amount in the range 1.0 to 20% by weight, reacting with the admixture at a temperature in the range 0 to 120° C. an amount of a polyisocyanate having an isocyanate functionality in the range 2.0 to 2.8 equal to 1.8-1.9 NCO to OH equivalents for a time sufficient to cap substantially all the hydroxyl groups of the admixture and thereafter adding additional polyisocyanate having an isocyanate functionality in the range 2.0 to 2.8 to provide 0.1-0.3 equivalents of NCO per initial equivalent of OH in excess of the theoretical amount necessary to react with the hydroxyl groups.
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) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |