US3767618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of epoxy resins by interfacial condensation and the resultant resins
Assignee: Dow Chemical Co
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Filing: 1971-09-23
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Granted: 1973-10-23
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Expires: 1991-09-23
Abstract
Abstract AN IMPROVEMENT IN THE PREPARATION OF EPOXY RESINS FROM A POLYHYDROXYL-CONTAINING COMPOUND, SUCH AS BISPHENOL A, AND A HALOHYDRIN, SUCH AS EPICHLOROHYDRIN, IN THE PRESENCE OF A DEHYDROHALOGENATION AGENT SUCH AS SODIUM HYDROXIDE BY INTERFACIAL CONDENSATION IS DISCLOSED WHEREIN THE IMPROVEMENT IS CONDUCTING THE REACTION IN THE PRESENCE OF WATER, IN THE AMOUNT OF 3-20 PARTS BY WEIGHT PER PART OF COMBINED REACTANTS, AS THE SOLE REACTION MEDIUM OTHER THAN THE REACTANTS AND COMPOUNDS ATTENDANT TO THE REACTION SUCH AS THE DEHYDROHALOGENATING AGENT AND THE EPOXY RESINS PRODUCED THEREBY CHARACTERIZED AS HAVING COMPARATIVELY LOW SOLUTIONS VISCOSITIES.
Inventors
- 👤 T Hairston
- 👤 W Bressler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:48
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/02; C08G59/04; C08G59/06; C08G59/063
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |