US4590254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-aqueous poly(urethane-urea)
Assignee: PPG Industries Inc
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Filing: 1985-04-29
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Granted: 1986-05-20
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Expires: 2005-04-29
Abstract
Abstract Disclosed herein is a poly(urethane-urea) which is prepared by reverse-addition of an isocyanate-terminated prepolymer to an organic medium containing an alcoholic solvent and a chain extender comprising at least two isocyanate-reactive active hydrogen groups consisting essentially of amino groups.
Inventors
- 👤 Wen-Hsuan Chang
- 👤 David T. McKeough
- 👤 Michael M. Chau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:15
CPC Classifications
C; C08; C08G; C08G71/00; C08G71/04; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/0838; C08G18/0842; C08G18/0847; C08G18/0852; C09; C09D; C09D175/00; C09D175/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
40 words
A poly(urethane-urea) which is prepared by adding an isocyanate-terminated prepolymer to a chain extender comprising at least two isocyanate-reactive active hydrogen groups consisting essentially of an amino group, said addition is conducted in an organic medium comprising an alcoholic solvent.
Claim 2
Dependent Claim
40 words
A poly(urethane-urea) which is prepared by adding an isocyanate-terminated prepolymer to a chain extender comprising at least two isocyanate-reactive active hydrogen groups consisting essentially of an amino group, said addition is conducted in an organic medium comprising an alcoholic solvent.
Claim 3
Dependent Claim
40 words
A poly(urethane-urea) of claim 1, wherein the prepolymer is a reaction product of (a) a polyisocyanate which is a diisocyanate selected from the group consisting of 4,4'-bis(isocyanatocyclohexyl)methane, toluene diisocyanate, isophorone diisocyanate and trimethylhexane diisocyanate, and (b) an active hydrogen-containing material.
Claim 4
Dependent Claim
11 words
A poly(urethane-urea) of claim 2, wherein the difunctional isocyanate is 4,4'-bis(isocyanatocyclohexyl)methane.
Claim 5
Dependent Claim
34 words
A poly(urethane-urea) of claim 2, wherein the active hydrogen-containing material is a diol selected from the group consisting of hexanediol, neopentyl glycol, propylene glycol, neopentyl hexahydrophthalate diol, hexyl-neopentyl-hexahydrophthalate diol, poly(hexaneadipate) diol and poly(neopentyladipate) diol.
Claim 6
Dependent Claim
15 words
A poly(urethane-urea) of claim 4, wherein the diol is neopentyl hexahydrophthalate diol or hexane-neopentyl-hexahydrophthalate diol.
Claim 7
Dependent Claim
21 words
A poly(urethane-urea) of claim 1, wherein the alcoholic solvent comprises an alcohol having a molecular weight of about 32 to 500.
Claim 8
Dependent Claim
17 words
A poly(urethane-urea) of claim 6, wherein the alcohol has a molecular weight of about 32 to 60.
Claim 9
Dependent Claim
46 words
A poly(urethane-urea) of claim 6, wherein the alcohol is a monohydric alcohol selected from the group consisting of isopropanol, n-butanol, 2-ethylhexanol, amyl alcohol and ethylene glycol monoethyl ether, or a polyhydric alcohol selected from the group consisting of ethylene glycol, propylene glycol, neopentyl glycol and hexanediol.
Claim 10
Dependent Claim
12 words
A poly(urethane-urea) of claim 1, wherein the chain extender is a diamine.
Claim 11
Dependent Claim
13 words
A poly(urethane-urea) of claim 9, wherein the chain extender is ethylenediamine or hydrazine.
Claim 12
Dependent Claim
11 words
A poly(urethane-urea) of claim 10 wherein the chain extender is hydrazine.
Claim 13
Dependent Claim
9 words
A coating composition comprising a poly(urethane-urea) of claim 1.
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) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |