Patent US4201846A successfully refreshed from Google Patents.
US4201846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dimensionally stable polyurethane foam
Assignee: WR Grace and Co
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Filing: 1978-11-24
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Granted: 1980-05-06
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Expires: 1998-11-24
Abstract
Abstract The invention disclosed relates to hydrophilic polyurethane foam which exhibits improved tensile and tear properties and reduced shrinkage upon drying as a result of incorporation of substantially hydrophilic reinforcing fibers formed from homopolymers and copolymers of polyvinyl alcohol. The reinforced foams also exhibit reduced swelling upon contact with water.
Inventors
- 👤 Clifton L. Kehr
- 👤 Louis L. Wood
- 👤 Nelson S. Marans
- 👤 Glenn E. Fulmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:58
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0085; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/62; C08G18/6212; C08G2110/00; C08G2110/0083; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S521/00; Y10S521/905
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
59 words
A reinforced, hydrophilic polyurethane foam comprising a poly(urea-urethane) foam matrix having an oxyalkylene backbone containing at least 40 mole percent oxyethylene, said foam matrix having uniformly distributed therein 1.0 to 15% by weight of the foam matrix of substantially hydrophilic, reinforcing fibers selected from the group consisting of polyvinyl alcohol homopolymer and copolymers of polyvinyl alcohol, and polyvinyl chloride.
Claim 2
Dependent Claim
59 words
A reinforced, hydrophilic polyurethane foam comprising a poly(urea-urethane) foam matrix having an oxyalkylene backbone containing at least 40 mole percent oxyethylene, said foam matrix having uniformly distributed therein 1.0 to 15% by weight of the foam matrix of substantially hydrophilic, reinforcing fibers selected from the group consisting of polyvinyl alcohol homopolymer and copolymers of polyvinyl alcohol, and polyvinyl chloride.
Claim 3
Dependent Claim
15 words
The foam of claim 1 wherein the fibers are hydrophilic, crosslinked polyvinyl alcohol homopolymer fibers.
Claim 4
Dependent Claim
16 words
A foam as in claim 1 wherein the fibers are hydrophilic polyvinyl chloride/polyvinyl alcohol copolymer fibers.
Claim 5
Dependent Claim
18 words
A polyurethane foam as in claim 1 wherein the fibers are from about 0.1 to about 20 denier.
Claim 6
Dependent Claim
21 words
A polyurethane foam as in claim 3 wherein the copolymer fibers contain at least 50 mole percent of polymerized vinyl alcohol.
Claim 7
Dependent Claim
22 words
A polyurethane foam as in claim 1 wherein the oxyalkylene backbone of the foam matrix contains at least 75 mole percent oxyethylene.
Claim 8
Independent Claim
71 words
A method of preparing a fiber-reinforced polyurethane foam comprising admixing a hydrophilic urethane prepolymer with water to form a foam matrix, said prepolymer having an oxyalkylene backbone containing at least 40 mole percent oxyethylene, said admixture having uniformly distributed therein 1.0 to 15% by weight of the foam matrix of substantially hydrophilic, reinforcing fibers selected from the group consisting of polyvinyl alcohol homopolymer and copolymers of polyvinyl alcohol and polyvinyl chloride.
Claim 9
Independent Claim
71 words
A method of preparing a fiber-reinforced polyurethane foam comprising admixing a hydrophilic urethane prepolymer with water to form a foam matrix, said prepolymer having an oxyalkylene backbone containing at least 40 mole percent oxyethylene, said admixture having uniformly distributed therein 1.0 to 15% by weight of the foam matrix of substantially hydrophilic, reinforcing fibers selected from the group consisting of polyvinyl alcohol homopolymer and copolymers of polyvinyl alcohol and polyvinyl chloride.
Claim 10
Dependent Claim
15 words
The method of claim 7 wherein the fibers are hydrophilic, crosslinked polyvinyl alcohol homopolymer fibers.
Claim 11
Dependent Claim
15 words
The method of claim 7 wherein the fibers are hydrophilic polyvinyl chloride/polyvinyl alcohol copolymer fibers.
Claim 12
Dependent Claim
18 words
The method of claim 7 wherein the fibers have a denier of from about 0.1. to about 20.
Claim 13
Dependent Claim
19 words
The method of claim 7 wherein the fibers are added to the water prior to admixture with the prepolymer.
Claim 14
Dependent Claim
32 words
The method of claim 11 wherein uniform dispersion of the fibers in the water is promoted by 0.5 to 5.0% by weight of the water of a thickening agent being added thereto.
Claim 15
Dependent Claim
17 words
A method as in claim 12 wherein the thickening agent is a high molecular weight water-soluble polymer.
Claim 16
Dependent Claim
157 words
A reinforced, crosslinked hydriphilic foam comprising a poly(urea-urethane) foam matrix 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. 0.5 to 10.0% by weight of A and B of a polyisocyanate having an isocyanate functionality in the range 2.0 to 3.0; and C. 6.5 to 390 moles of water for each mole of unreacted isocyanate, said matrix having uniformly distributed therein 1.0 to 15% by weight of the foam matrix of substantially hydrophilic reinforcing fibers selected from the group consisting of homopolymer and copolymers of polyvinyl alcohol.
Claim 17
Dependent Claim
157 words
A reinforced, crosslinked hydriphilic foam comprising a poly(urea-urethane) foam matrix 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. 0.5 to 10.0% by weight of A and B of a polyisocyanate having an isocyanate functionality in the range 2.0 to 3.0; and C. 6.5 to 390 moles of water for each mole of unreacted isocyanate, said matrix having uniformly distributed therein 1.0 to 15% by weight of the foam matrix of substantially hydrophilic reinforcing fibers selected from the group consisting of homopolymer and copolymers of polyvinyl alcohol.
Claim 18
Dependent Claim
15 words
The foam of claim 14 wherein the fibers are hydrophilic, crosslinked polyvinyl alcohol homopolymer fibers.
Claim 19
Dependent Claim
16 words
A foam as in claim 14 wherein the fibers are hydrophilic polyvinyl chloride/polyvinyl alcohol copolymer fibers.
Claim 20
Dependent Claim
18 words
A polyurethane foam as in claim 14 wherein the fibers are from about 0.1 to about 20 denier.
Claim 21
Dependent Claim
21 words
A polyurethane foam as in claim 16 wherein the copolymer fibers contain at least 50 mole percent of polymerized vinyl alcohol.
Claim 22
Dependent Claim
22 words
A polyurethane foam as in claim 14 wherein the oxyalkylene backbone of the foam matrix contains at least 75 mole percent oxyethylene.
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) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |