US4049632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chain extending polyurethanes with a large excess of water
Assignee: Armstrong World Industries Inc
•
Filing: 1976-07-14
•
Granted: 1977-09-20
•
Expires: 1996-07-14
Abstract
Abstract A polyurethane-urea composition is described that is highly resistant to textile fiber-dressings. The composition is a product from the reaction of an ester urethane prepolymer formed from the reaction of a diisocyanate and a hydroxy-terminated polyester of equivalent weight 400-1,000 in which the ratio of isocyanate functionality:hydroxy functionality is from 2.0:1 to 4.0:1; and an excess of water.
Inventors
- 👤 Alan B. Magnusson
- 👤 Howard S. White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:24
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/08; C08G18/10; Y; Y10; Y10S; Y10S528/00; Y10S528/902
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
86 words
A method of producing a polyurethane-urea elastomer resistant to textile fiber dressing solvents which comprises the steps of: a. reacting a prepolymer having terminal isocyanate groups obtained by reacting 1. a diisocyanate selected from the group consisting of xylylene diisocyanate, toluene diisocyanate, diisocyanato cyclohexyl methane and isophorone diisocyanate; with 2. a difunctional, hydroxy-terminated polyester of equivalent weight 480-540, without solvent, in a low-intensity mixer with: b. water, wherein the quantity of said water is 3-20 times greater than necessary to react with said terminal isocyanate groups.
Claim 2
Independent Claim
86 words
A method of producing a polyurethane-urea elastomer resistant to textile fiber dressing solvents which comprises the steps of: a. reacting a prepolymer having terminal isocyanate groups obtained by reacting 1. a diisocyanate selected from the group consisting of xylylene diisocyanate, toluene diisocyanate, diisocyanato cyclohexyl methane and isophorone diisocyanate; with 2. a difunctional, hydroxy-terminated polyester of equivalent weight 480-540, without solvent, in a low-intensity mixer with: b. water, wherein the quantity of said water is 3-20 times greater than necessary to react with said terminal isocyanate groups.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the temperature of the reaction of said prepolymer and said water is from 70° C. to 100° C.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein said low-intensity mixer is a Sigma-blade mixer.
Claim 5
Dependent Claim
14 words
The method of claim 1 wherein said diisocyanate is meta-xylylene diisocyanate or para-xylylene diisocyanate.
Claim 6
Dependent Claim
23 words
The method of claim 1 wherein said difunctional, hydroxy-terminated polyester selected from the group poly(propylene succinate), poly(butylene dimethylmaleate), poly(propylene isophthalate) and poly(ethylene adipate).
Claim 7
Dependent Claim
22 words
The method of claim 1 wherein the NCO:OH ratio of said organic diisocyanate and said hydroxy-terminated polyester is from 2.0:1 to 4.0:1.
References Cited (Backward Citations)
US2657151A
Cited
US2968575A
Cited
US3213049A
Cited
US3505275A
Cited
US3714095A
Cited
US3560447A
Cited
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 |