US4049592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biodegradable hydrophilic foams and method
Assignee: WR Grace and Co
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Filing: 1976-10-12
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Granted: 1977-09-20
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Expires: 1996-10-12
Abstract
Abstract The invention disclosed is directed to biodegradable hydrophilic polyurethane structures prepared by using an isocyanate capped hydroxyester polyol reactant with large amounts of aqueous reactant. The resultant foam has economy in handling, and upon contact with liquids or body fluids, the foam is highly absorptive while being readily biodegradable after use.
Inventors
- 👤 Nelson Samuel Marans
- 👤 Alan Ricky Pollack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:44
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/425; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/32; C08G18/3203; C08G18/3221; C08G18/40; C08G18/42; C08G18/4266; C08G18/4283; C08G18/48; C08G18/4887; C08G18/4891; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/005; C08G2110/0058; C08G2110/0083; C08G2230/00; Y; Y10; Y10S; Y10S521/00; Y10S521/905; Y10S521/916
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
92 words
A method of preparing biodegradable foam structures having three-dimensional networks, said method comprising, foaming a first component comprising isocyanate capped hydroxyester polyol having a reaction functionality of at least 2 with a second component comprising aqueous reactant wherein the H 2 O Index Value is about 1,300 to 78,000, the hydroxyester linkages in said polyol formed by condensation of an aliphatic hydroxy carboxylic acid with the hydroxyl groups of (a) an essentially linear polyether, or (b) a monomeric low molecular weight aliphatic alcohol containing from 3 to 8 hydroxyl groups per mole.
Claim 2
Independent Claim
92 words
A method of preparing biodegradable foam structures having three-dimensional networks, said method comprising, foaming a first component comprising isocyanate capped hydroxyester polyol having a reaction functionality of at least 2 with a second component comprising aqueous reactant wherein the H 2 O Index Value is about 1,300 to 78,000, the hydroxyester linkages in said polyol formed by condensation of an aliphatic hydroxy carboxylic acid with the hydroxyl groups of (a) an essentially linear polyether, or (b) a monomeric low molecular weight aliphatic alcohol containing from 3 to 8 hydroxyl groups per mole.
Claim 3
Dependent Claim
59 words
The method of claim 1 wherein the isocyanate capped hydroxyester polyol is present in the first component in an amount from about 3% by weight up to 100% by weight, wherein an isocyanate capped polyoxyethylene polyol having a terminal member with an isocyanate functionality of two is present in an amount from 0% up to about 97% by weight.
Claim 4
Dependent Claim
36 words
The method of claim 1 wherein the polyol moiety of the isocyanate capped member has a weight average molecular weight of about 200 to about 20,000, and a hydroxyl functionality of about 2 to about 8.
Claim 5
Dependent Claim
17 words
The method of claim 3 wherein the weight average molecular weight is about 250 to about 6,000.
Claim 6
Dependent Claim
19 words
The method of claim 3 wherein the H 2 0 Index Value is from about 4,000 to about 40,000.
Claim 7
Dependent Claim
9 words
The product prepared by the method of claim 1.
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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) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |