Patent US5811342A successfully refreshed from Google Patents.
Patent US4076764A successfully refreshed from Google Patents.
US4076764A
Expired / Lapsed
US
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Epoxy resin composition having improved physical properties
Assignee: Shell USA Inc
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Filing: 1976-07-22
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Granted: 1978-02-28
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Expires: 1996-07-22
Abstract
Abstract The physical properties of heat-cured coatings of saturated epoxy resins are significantly improved by the addition of heat stabilizers (antioxidant) and/or actinic stabilizers.
Inventors
- 👤 Ronald S. Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:06
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/24; C09; C09D; C09D163/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
75 words
A heat-curable composition comprising (1) 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 phenolic group are saturated, (2) a curing amount of an urea-formaldehyde or melamine-formaldehyde resin and (3) from about 0.01 to about 5.0 parts per hundred parts by weight of the glycidyl ether of at least one stabilizer selected from the group consisting of actinic stabilizers and heat stabilizers.
Claim 2
Dependent Claim
75 words
A heat-curable composition comprising (1) 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 phenolic group are saturated, (2) a curing amount of an urea-formaldehyde or melamine-formaldehyde resin and (3) from about 0.01 to about 5.0 parts per hundred parts by weight of the glycidyl ether of at least one stabilizer selected from the group consisting of actinic stabilizers and heat stabilizers.
Claim 3
Dependent Claim
17 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.
Claim 5
Dependent Claim
14 words
The composition of claim 1 wherein the heat stabilizer is a sterically hindered phenol.
Claim 6
Dependent Claim
16 words
The composition of claim 4 wherein the sterically hindered phenol is tetrakis [methylene 3-(3',5'-di-tert-butyl-4'-hydroxyphenol) propionate] methane.
Claim 7
Dependent Claim
14 words
The composition of claim 4 wherein the sterically hindered phenol is thiodiethylene bis-(3,5-di-tert-butyl-4'-hydroxy) hydrocinnamate.
Claim 8
Dependent Claim
14 words
The composition of claim 4 wherein the sterically hindered phenol is octadecyl 3-(3',5'-di-tert-butyl-4'-hydroxyphenyl) propionate.
Claim 9
Dependent Claim
12 words
The composition of claim 1 wherein the actinic stabilizer is a chlorobenzotriazole.
Claim 10
Dependent Claim
10 words
The composition of claim 8 wherein the chlorobenzotriazole is 2-(3',5'-ditert-butyl-2'-hydroxyphenyl)5-chlorobenzotriazole.
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) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |