Patent US4081491A successfully refreshed from Google Patents.
US4081491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Saturated epoxy resin coating compositions exhibiting improved weatherability
Assignee: Shell USA Inc
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Filing: 1976-07-22
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Granted: 1978-03-28
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Expires: 1996-07-22
Abstract
Abstract The preparation of solid saturated epoxy resin compositions, which when cured with conventional epoxy curing agents yield coatings exhibiting improved weatherability, i.e., better gloss retention and better chalk resistance, are described. The solid saturated epoxy resins are prepared by reacting liquid or semisolid saturated epoxy resins with a dihydroxy phenol such as resorcinol in the presence of a suitable catalyst.
Inventors
- 👤 Ronald S. Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:29
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/24; C08G59/02; C08G59/04; C08G59/06; C08G59/066
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
73 words
A heat curable composition comprising (1) a solid polyepoxide having an average molecular weight from about 1,000 to about 3,000 prepared by reacting from about 0.2 to about 0.8 moles of resorcinol with 1.0 moles of a glycidyl ether of a polyhydric phenol having at least one vicinal epoxy group and wherein the carbon-to-carbon bonds within the six-membered aromatic ring are saturated and (2) a curing amount of an urea-formaldehyde or melamine-formaldehyde resin.
Claim 2
Dependent Claim
73 words
A heat curable composition comprising (1) a solid polyepoxide having an average molecular weight from about 1,000 to about 3,000 prepared by reacting from about 0.2 to about 0.8 moles of resorcinol with 1.0 moles of a glycidyl ether of a polyhydric phenol having at least one vicinal epoxy group and wherein the carbon-to-carbon bonds within the six-membered aromatic ring are saturated and (2) a curing amount of an urea-formaldehyde or melamine-formaldehyde resin.
Claim 3
Dependent Claim
16 words
The composition of claim 1 wherein the glycidyl ether is a hydrogenated diglycidyl ether of 2,2-bis(4-hydroxyphenyl)propane.
Claim 4
Dependent Claim
16 words
The composition of claim 1 wherein the glycidyl ether is derived from a hydrogenated polyhydric phenol.
References Cited (Backward Citations)
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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) | 1981-03-27 | 1981-09-26 | 1982-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-27 | 1985-09-26 | 1986-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-27 | 1989-09-26 | 1990-03-28 | $7700.00 | Window Closed / Lapsed |