US3862260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy curing system
Assignee: Union Carbide Corp
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Filing: 1973-05-07
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Granted: 1975-01-21
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Expires: 1993-05-07
Abstract
Abstract This invention relates to a curing agent comprising a trifunctional hardener containing essentially three aromatic bonded hydroxyl groups and is the reaction product of 2,2''-bis(4hydroxylphenyl)propane (hereinafter called ''''Bisphenol A''''), phenol and formaldehyde and an imidazole in an amount of about 0.1 percent by weight to about 15 percent by weight based on the weight of the trifunctional hardener and to polyepoxide compositions containing this curing agent, which are characterized by excellent storage life, by excellent curing speed, good color, good solvent resistance, enhanced copper adhesion and good humidity resistance.
Inventors
- 👤 Ralph F Sellers
- 👤 James R Harvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:16
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/56; C08L; C08L63/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31518; Y10T442/00; Y10T442/20; Y10T442/2926; Y10T442/2992
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
A CURABLE COMPOSITION COMPRISING AN EPOXIDE HAVING MORE THAN ONE GLYCIDYL GROUP PE MOLECULE AND IN AN AMOUNT SUFFICIENT TO PROVIDE ABOUT 0.5 TO ABOUT 1.5 PHENOLIC HYDROXYL GROUPS PER EPOXIDE EQUIVALENT, A CURING AGENT COMPRISING A TRIFUNCTIONAL HARDNER OF THE REACTION PRODUCT OF 2,2''-BIS(4HYDROXYPHENYL) PROPANE, "WITH FORMALDEHYDE IN ABOUT A 1:1 MOLAR RATIO UNDER ALKALINE CONDITIONS," FOLLOWED BY REACTION WITH EXCESS PHENOL UNDER ACIDIC CONDITIONS," AND AN IMIDAZOLE IN AN AMOUNT OF ABOUT 0.1 PART BY WEIGHT TO ABOUT 15 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF THE SAID HARDNER.
Claim 2
Dependent Claim
93 words
A CURABLE COMPOSITION COMPRISING AN EPOXIDE HAVING MORE THAN ONE GLYCIDYL GROUP PE MOLECULE AND IN AN AMOUNT SUFFICIENT TO PROVIDE ABOUT 0.5 TO ABOUT 1.5 PHENOLIC HYDROXYL GROUPS PER EPOXIDE EQUIVALENT, A CURING AGENT COMPRISING A TRIFUNCTIONAL HARDNER OF THE REACTION PRODUCT OF 2,2''-BIS(4HYDROXYPHENYL) PROPANE, "WITH FORMALDEHYDE IN ABOUT A 1:1 MOLAR RATIO UNDER ALKALINE CONDITIONS," FOLLOWED BY REACTION WITH EXCESS PHENOL UNDER ACIDIC CONDITIONS," AND AN IMIDAZOLE IN AN AMOUNT OF ABOUT 0.1 PART BY WEIGHT TO ABOUT 15 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF THE SAID HARDNER.
Claim 3
Dependent Claim
10 words
The cured product of the composition defined in claim 1.
Claim 4
Dependent Claim
13 words
A curable composition as defined in claim 1 wherein the imidazole is 2-phenylimidazole.
Claim 5
Dependent Claim
16 words
A curable composition as defined in claim 1 wherein the epoxide is diglycidylether of 2,2-bis(p-hydroxyphenyl) propane.
Claim 6
Dependent Claim
10 words
An epoxy varnish made from the composition of claim 1.
Claim 7
Dependent Claim
15 words
A glass fiber laminate comprising glass fiber fabric impregnated with the composition 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) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |