US3842037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing higher molecular weight polyepoxide products by condensing lower molecular weight polyepoxide with polyhydric phenols
Assignee: Shell USA Inc
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Filing: 1973-05-31
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Granted: 1974-10-15
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Expires: 1993-05-31
Abstract
Abstract 1. IN A PROCESS FOR PREPARING HIGHER MOLECULAR WEIGHT RESINOUS POLYEPOXIDES BY CONDENSING A LOWER MOLECULAR WEIGHT POLYEPOXIDE HAVING MORE THAN ONE VICINAL EPOXY GROUP WITH A POLYHYDRIC PHENOL IN THE PRESENCE OF AN ALKALINE CONDENSATION CATALYST WHEREIN THE RATIO OF EPOXIDE GROUPS TO PHENOLIC HYDROXYL GROUPS IS FROM ABOUT 1.05 TO ABOUT 10, THE IMPROVEMENT WHICH COMPRISES ADDING AN INORGANIC ACID HAVING A PKA BELOW ABOUT 4 IN AMOUNT TO NEUTRALIZE SAID CATALYST WHEN AT LEAST 85% OF TH PHENOLIC HYDROXYL GROUPS PRESENT IN THE STARTING MATERIALS HAVE BEEN CONVERTED.
Inventors
- 👤 F Sinnema
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:49
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/02; C08G59/04; C08G59/06; C08G59/066
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
IN A PROCESS FOR PREPARING HIGHER MOLECULAR WEIGHT RESINOUS POLYEPOXIDES BY CONDENSING A LOWER MOLECULAR WEIGHT POLYEPOXIDE HAVING MORE THAN ONE VICINAL EPOXY GROUP WITH A POLYHYDRIC PHENOL IN THE PRESENCE OF AN ALKALINE CONDENSATION CATALYST WHEREIN THE RATIO OF EPOXIDE GROUPS TO PHENOLIC HYDROXYL GROUPS IS FROM ABOUT 1.05 TO ABOUT 10, THE IMPROVEMENT WHICH COMPRISES ADDING AN INORGANIC ACID HAVING A PKA BELOW ABOUT 4 IN AMOUNT TO NEUTRALIZE SAID CATALYST WHEN AT LEAST 85% OF TH PHENOLIC HYDROXYL GROUPS PRESENT IN THE STARTING MATERIALS HAVE BEEN CONVERTED.
Claim 2
Dependent Claim
90 words
IN A PROCESS FOR PREPARING HIGHER MOLECULAR WEIGHT RESINOUS POLYEPOXIDES BY CONDENSING A LOWER MOLECULAR WEIGHT POLYEPOXIDE HAVING MORE THAN ONE VICINAL EPOXY GROUP WITH A POLYHYDRIC PHENOL IN THE PRESENCE OF AN ALKALINE CONDENSATION CATALYST WHEREIN THE RATIO OF EPOXIDE GROUPS TO PHENOLIC HYDROXYL GROUPS IS FROM ABOUT 1.05 TO ABOUT 10, THE IMPROVEMENT WHICH COMPRISES ADDING AN INORGANIC ACID HAVING A PKA BELOW ABOUT 4 IN AMOUNT TO NEUTRALIZE SAID CATALYST WHEN AT LEAST 85% OF TH PHENOLIC HYDROXYL GROUPS PRESENT IN THE STARTING MATERIALS HAVE BEEN CONVERTED.
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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |