US4101516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clear and colorless epoxide dianhydride cured resins
Assignee: Gulf Research and Development Co
•
Filing: 1976-12-10
•
Granted: 1978-07-18
•
Expires: 1996-12-10
Abstract
Abstract A clear, colorless cured resin is prepared from a solid epoxy resin and 5-phenyl-5-methylhexane-1,2,3,4-tetracarboxylic acid dianhydride.
Inventors
- 👤 Walter P. Barie, Jr.
- 👤 James T. Eurich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:47
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/4223
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
56 words
A powdered resin mixture which will cure to a clear, substantially colorless hard resin comprising 5-phenyl-5-methylhexane-1,2,3,4-tetracarboxylic acid dianhydride and an epoxy resin having an epoxy equivalent value greater than one and an epoxy equivalent weight between about 400 and about 4,000, and a ratio of anhydride equivalents to epoxy equivalents of between 1.0 and about 1.5.
Claim 2
Dependent Claim
56 words
A powdered resin mixture which will cure to a clear, substantially colorless hard resin comprising 5-phenyl-5-methylhexane-1,2,3,4-tetracarboxylic acid dianhydride and an epoxy resin having an epoxy equivalent value greater than one and an epoxy equivalent weight between about 400 and about 4,000, and a ratio of anhydride equivalents to epoxy equivalents of between 1.0 and about 1.5.
Claim 3
Dependent Claim
22 words
A powdered resin mixture in accordance with claim 1 in which the epoxy equivalent weight is between about 500 and about 2,500.
Claim 4
Dependent Claim
21 words
A powdered resin mixture in accordance with claim 1 in which the epoxy resin is the diglycidyl ether of bisphenol A.
Claim 5
Dependent Claim
19 words
A powdered resin mixture in accordance with claim 1 comprising tin octanoate or zinc acetylacetonate as a reaction accelerator.
Claim 6
Independent Claim
71 words
A method of making a clear, substantially colorless, cured resin comprising curing at a temperature between about 140° C. and about 190° C., a powdered mixture of 5-phenyl-5-methylhexane-1,2,3,4-tetracarboxylic acid dianhydride, and an epoxy resin having an epoxy equivalent value greater than one and an epoxy equivalent weight between about 400 and about 4,000, the ratio of anhydride equivalents to epoxy equivalents in said powdered mixture being between 1.0 and about 1.5.
Claim 7
Independent Claim
71 words
A method of making a clear, substantially colorless, cured resin comprising curing at a temperature between about 140° C. and about 190° C., a powdered mixture of 5-phenyl-5-methylhexane-1,2,3,4-tetracarboxylic acid dianhydride, and an epoxy resin having an epoxy equivalent value greater than one and an epoxy equivalent weight between about 400 and about 4,000, the ratio of anhydride equivalents to epoxy equivalents in said powdered mixture being between 1.0 and about 1.5.
Claim 8
Dependent Claim
20 words
A method in accordance with claim 5 in which the epoxy equivalent weight is between about 500 and about 2,500.
Claim 9
Dependent Claim
19 words
A method in accordance with claim 5 in which the epoxy resin is the diglycidyl ether of bisphenol A.
Claim 10
Dependent Claim
22 words
A method in accordance with claim 5 in which the powdered mixture comprises zinc acetylacetonate or tin octanoate as a reaction accelerator.
Claim 11
Dependent Claim
58 words
A clear, substantially colorless, cured resin comprising the copolymer of 5-phenyl-5-methylhexane-1,2,3,4-tetracarboxylic acid dianhydride and an epoxy resin having a 1,2-epoxy equivalent value greater than one and an epoxy equivalent weight between about 400 and about 4,000 and a ratio of anhydride equivalent in said dianhydride to epoxy equivalents in said epoxy resin of between 1.0 and about 1.5.
Claim 12
Dependent Claim
58 words
A clear, substantially colorless, cured resin comprising the copolymer of 5-phenyl-5-methylhexane-1,2,3,4-tetracarboxylic acid dianhydride and an epoxy resin having a 1,2-epoxy equivalent value greater than one and an epoxy equivalent weight between about 400 and about 4,000 and a ratio of anhydride equivalent in said dianhydride to epoxy equivalents in said epoxy resin of between 1.0 and about 1.5.
Claim 13
Dependent Claim
21 words
A cured resin in accordance with claim 9 in which the epoxy equivalent weight is between about 500 and about 2,500.
Claim 14
Dependent Claim
20 words
A cured resin in accordance with claim 9 in which the epoxy resin is the diglycidyl ether of bisphenol A.
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) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |