Patent US4132839A successfully refreshed from Google Patents.
US4132839A
Expired / Lapsed
US
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Biodegradable hydrophilic foams and method
Assignee: WR Grace and Co
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Filing: 1977-09-16
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Granted: 1979-01-02
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Expires: 1997-09-16
Abstract
Abstract Disclosed herein are novel prepolymers which, when foamed provide hydrophilic polyurethane foams which are biodegradable.
Inventors
- 👤 Nelson S. Marans
- 👤 Alan R. Pollack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:54
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; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; C08G2110/00; C08G2110/0008; C08G2110/0083; C08G2230/00; Y; Y10; Y10S; Y10S521/00; Y10S521/905; Y10S521/916
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
86 words
An isocyanate-capped polyether polyol having an isocyanate functionality of at least 2, said polyol comprising a mixture, prior to capping, of (a) an essentially linear, hydroxy terminated polyether having a molecular weight not exceeding about 4,000 with (b) a reaction product formed by reacting an aliphatic alcohol having from 3 to 8 hydroxyl groups per mole and a molecular weight of less than about 1,000 with a monobasic hydroxy carboxylic acid containing up to 20 carbon atoms to esterify the hydroxyl groups of said aliphatic alcohol.
Claim 2
Dependent Claim
86 words
An isocyanate-capped polyether polyol having an isocyanate functionality of at least 2, said polyol comprising a mixture, prior to capping, of (a) an essentially linear, hydroxy terminated polyether having a molecular weight not exceeding about 4,000 with (b) a reaction product formed by reacting an aliphatic alcohol having from 3 to 8 hydroxyl groups per mole and a molecular weight of less than about 1,000 with a monobasic hydroxy carboxylic acid containing up to 20 carbon atoms to esterify the hydroxyl groups of said aliphatic alcohol.
Claim 3
Dependent Claim
22 words
A polyol as in claim 1 wherein the polyether is a polyoxyalkylene copolymer containing at least 50% by weight of oxyethylene units.
Claim 4
Dependent Claim
13 words
A polyol as in claim 1 wherein the hydroxy acid is lactic acid.
Claim 5
Dependent Claim
20 words
A polyol as in claim 1 wherein component b) is the trilactate ester formed by reacting trimethylolpropane and lactic acid.
Claim 6
Dependent Claim
18 words
A polyol as in claim 1 wherein the polyether has a molecular weight of less than about 4,000.
Claim 7
Dependent Claim
82 words
An isocyanate-capped polyether polyol having an isocyanate functionality of at least 2, said polyol comprising a mixture, prior to capping, of (a) an aliphatic alcohol having from 3 to 8 hydroxyl groups per mole and a molecular weight of less than about 1,000 and (b) an essentially linear hydroxy terminated polyether having a molecular weight not exceeding about 4,000, wherein the hydroxyl groups of the polyether are esterified by reaction with a monobasic hydroxy carboxylic acid containing up to 20 carbon atoms.
Claim 8
Dependent Claim
82 words
An isocyanate-capped polyether polyol having an isocyanate functionality of at least 2, said polyol comprising a mixture, prior to capping, of (a) an aliphatic alcohol having from 3 to 8 hydroxyl groups per mole and a molecular weight of less than about 1,000 and (b) an essentially linear hydroxy terminated polyether having a molecular weight not exceeding about 4,000, wherein the hydroxyl groups of the polyether are esterified by reaction with a monobasic hydroxy carboxylic acid containing up to 20 carbon atoms.
Claim 9
Dependent Claim
22 words
A polyol as in claim 6 wherein the polyether is a polyoxyalkylene copolymer containing at least 50% by weight of oxyethylene units.
Claim 10
Dependent Claim
13 words
A polyol as in claim 6 wherein the hydroxy acid is lactic acid.
Claim 11
Dependent Claim
18 words
A polyol as in claim 6 wherein the polyether has a molecular weight of less than about 4,000.
Claim 12
Dependent Claim
26 words
A polyol as in claim 6 wherein from about 0.2 to about 2.5 moles of the monomeric aliphatic alcohol are employed for each mole of polyether.
Claim 13
Dependent Claim
116 words
An isocyanate-capped polyether polyol having an isocyanate functionality of at least 2, said polyol corresponding to the formula: T--L--A) x wherein T is the residue of an aliphatic alcohol, x is an integer from 3 to 8 corresponding to the number of hydroxyl groups in the alcohol prior to reaction to form said residue, L is a hydroxy carboxylic acid residue, said alcohol residue bonded to said acid residue by means of an ester linkage, and A is an essentially linear hydroxy terminated polyether residue bonded to said acid residue by an ether linkage, the terminal free hydroxyl group of said polyether being linked by a urethane linkage to the isocyanate used in capping the polyol.
Claim 14
Dependent Claim
116 words
An isocyanate-capped polyether polyol having an isocyanate functionality of at least 2, said polyol corresponding to the formula: T--L--A) x wherein T is the residue of an aliphatic alcohol, x is an integer from 3 to 8 corresponding to the number of hydroxyl groups in the alcohol prior to reaction to form said residue, L is a hydroxy carboxylic acid residue, said alcohol residue bonded to said acid residue by means of an ester linkage, and A is an essentially linear hydroxy terminated polyether residue bonded to said acid residue by an ether linkage, the terminal free hydroxyl group of said polyether being linked by a urethane linkage to the isocyanate used in capping the polyol.
Claim 15
Dependent Claim
22 words
A polyol as in claim 11 wherein the polyether is a polyoxyalkylene copolymer containing at least 50% by weight of oxyethylene units.
Claim 16
Dependent Claim
13 words
A polyol as in claim 11 wherein the hydroxy acid is lactic acid.
Claim 17
Dependent Claim
18 words
A polyol as in claim 11 wherein the ester linkage is formed by reacting trimethylolpropane and lactic acid.
Claim 18
Dependent Claim
18 words
A polyol as in claim 11 wherein the polyether has a molecular weight of less than about 4,000.
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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) | 1982-01-01 | 1982-07-03 | 1983-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-01 | 1986-07-03 | 1987-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-01 | 1990-07-03 | 1991-01-02 | $7700.00 | Window Closed / Lapsed |