US4383079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extension of polyurethane hydrogel cure time
Assignee: 3M Co
•
Filing: 1981-04-09
•
Granted: 1983-05-10
•
Expires: 2001-04-09
Abstract
Abstract The cure time of polyurethane prepolymer curable with water to form polyurethane hydrogel is prolonged by the addition to the water of certain micelle-forming adducts which substantially extend the cure time.
Inventors
- 👤 Alton J. Gasper
- 👤 James N. Wells
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:15
CPC Classifications
C; C09; C09K; C09K17/00; C09K17/14; C09K17/18; C09K17/30; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/089; C08G18/10; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/4837; C08G2210/00; Y; Y10; Y10S; Y10S521/00; Y10S521/904; Y10S521/905; Y10S528/00; Y10S528/905
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
78 words
A method of curing diisocyanate-terminated polyurethane prepolymer curable in the presence of water to form a hydrogel including the step of reacting said prepolymer in the presence of sufficient water to form a hydrogel, the improvement comprising adding sufficient micelle-forming adduct to said water to significantly inhibit the cure rate of said prepolymer, wherein said micelle-forming adduct is an alcohol having the general formula H(CH 2 ) x (OH) y where x is 1-6 and y is 1-3.
Claim 2
Independent Claim
78 words
A method of curing diisocyanate-terminated polyurethane prepolymer curable in the presence of water to form a hydrogel including the step of reacting said prepolymer in the presence of sufficient water to form a hydrogel, the improvement comprising adding sufficient micelle-forming adduct to said water to significantly inhibit the cure rate of said prepolymer, wherein said micelle-forming adduct is an alcohol having the general formula H(CH 2 ) x (OH) y where x is 1-6 and y is 1-3.
Claim 3
Dependent Claim
67 words
A composition curable to form a polyurethane hydrogel comprising: (a) polyurethane prepolymer having terminal isocyanate groups; and (b) water containing sufficient cure-inhibiting micelle-forming adduct to provide a weight ratio of adduct to polyurethane prepolymer in the range of about 1:20 to 1:1, wherein said micelle-forming adduct is an alcohol having the general formula H(CH 2 ) x (OH) y where x is 1-6 and y is 1-3.
Claim 4
Dependent Claim
67 words
A composition curable to form a polyurethane hydrogel comprising: (a) polyurethane prepolymer having terminal isocyanate groups; and (b) water containing sufficient cure-inhibiting micelle-forming adduct to provide a weight ratio of adduct to polyurethane prepolymer in the range of about 1:20 to 1:1, wherein said micelle-forming adduct is an alcohol having the general formula H(CH 2 ) x (OH) y where x is 1-6 and y is 1-3.
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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) | 1986-05-09 | 1986-11-08 | 1987-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-09 | 1990-11-08 | 1991-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-09 | 1994-11-08 | 1995-05-10 | $7700.00 | Window Closed / Lapsed |