Patent US4923934A successfully refreshed from Google Patents.
US4923934A
Expired / Lapsed
US
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Interpenetrating polymer network of blocked urethane prepolymer, polyol, epoxy resin and anhydride
Assignee: Individual
•
Filing: 1989-01-05
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Granted: 1990-05-08
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Expires: 2009-01-05
Abstract
Abstract A composition for use in forming an interpenetrating polymer network includes a blocked urethane prepolymer, a polyol, an epoxy resin and an epoxy catalyzing agent.
Inventors
- 👤 Todd A. Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:50
CPC Classifications
C; C08; C08L; C08L63/00; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C09; C09D; C09D175/00; C09D175/04; C08G2270/00; Y; Y10; Y10S; Y10S525/00; Y10S525/903
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
35 words
An interpenetrating polymer network for use as a coating formed by the reaction product of a composition comprising: a blocked urethane prepolymer; a polyol; an epoxy resin; and an anhydride as an epoxy catalyzing agent.
Claim 2
Dependent Claim
35 words
An interpenetrating polymer network for use as a coating formed by the reaction product of a composition comprising: a blocked urethane prepolymer; a polyol; an epoxy resin; and an anhydride as an epoxy catalyzing agent.
Claim 3
Dependent Claim
26 words
The interpenetrating polymer network formed by the reaction product of the composition of claim I wherein the blocked urethane prepolymer has isocyanate functionality greater than 1.
Claim 4
Dependent Claim
21 words
The interpenetrating polymer network formed by the reaction product of the composition of claim 1 wherein the polyol is a polyester.
Claim 5
Dependent Claim
22 words
The interpenetrating polymer network formed by the reaction product of the composition of claim 1 wherein the composition further includes a solvent.
Claim 6
Dependent Claim
79 words
The interpenetrating polymer network formed by the reaction product of the composition of claim 1 wherein the polyol is a saturated polyester resin and wherein the blocked urethane prepolymer is in the equivalent weight range of approximately 170 to 3,000, the polyester is in the equivalent weight range of approximately 195 to 2,000, the epoxy resin is in the equivalent weight range of approximately 170 to 3,000, and the anhydride is in the equivalent weight range of approximately 100-270.
Claim 7
Dependent Claim
21 words
The interpenetrating polymer network formed by the reaction product of the composition of claim 5, wherein the blocking agent is caperolactone.
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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) | 1993-05-07 | 1993-11-06 | 1994-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-07 | 1997-11-06 | 1998-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-07 | 2001-11-06 | 2002-05-08 | $7700.00 | Window Closed / Lapsed |