Patent US2494087A successfully refreshed from Google Patents.
US2494087A
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Preparation of chloroprene polymers
Assignee: EIDP Inc
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Filing: 1948-03-23
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Granted: 1950-01-10
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Expires: 1968-03-23
Abstract
No abstract record available.
Inventors
- 👤 George H Daniels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:07
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04; C08F36/14; C08F36/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
AN IMPROVEMENT IN THE PROCESS FOR PREPARING POLYCHLOROPRENE BY EMULSION POLYMERIZATION OF CHLOROPRENE WHICH CONTAINS FROM 0.01% TO 0.2% OF CARBONYL COMPOUNDS AS IMPURITIES AND WHEREIN THE POLYMERIZATION IS CARRIED OUT IN THE PRESENCE OF AN ALKYL MERCAPTAN, WHICH COMPRISES CARRYING OUT THE POLYMERIZATION OF THE CHLOROPRENE IN AN AQUEOUS ALKALINE EMULSION HAVING A PH OF FROM 8.5 TO 12.5 CONTAINING FROM 0.05% TO 0.05%, BASED ON THE WEIGHT OF THE CHLOROPRENE, OF A REDUCING AGENT SELECTED FROM THE GROUP CONSISTING OF HYDROXYLAMINE, HYDRAZINE, WATER-SOLUBLE SULFIDES, WATER-SOLUBLE HYDROSULFITES AND WATER-SOLUBLE NORMAL SULFITES.
Claim 2
Dependent Claim
92 words
AN IMPROVEMENT IN THE PROCESS FOR PREPARING POLYCHLOROPRENE BY EMULSION POLYMERIZATION OF CHLOROPRENE WHICH CONTAINS FROM 0.01% TO 0.2% OF CARBONYL COMPOUNDS AS IMPURITIES AND WHEREIN THE POLYMERIZATION IS CARRIED OUT IN THE PRESENCE OF AN ALKYL MERCAPTAN, WHICH COMPRISES CARRYING OUT THE POLYMERIZATION OF THE CHLOROPRENE IN AN AQUEOUS ALKALINE EMULSION HAVING A PH OF FROM 8.5 TO 12.5 CONTAINING FROM 0.05% TO 0.05%, BASED ON THE WEIGHT OF THE CHLOROPRENE, OF A REDUCING AGENT SELECTED FROM THE GROUP CONSISTING OF HYDROXYLAMINE, HYDRAZINE, WATER-SOLUBLE SULFIDES, WATER-SOLUBLE HYDROSULFITES AND WATER-SOLUBLE NORMAL SULFITES.
References Cited (Backward Citations)
US2227517A
Cited
US2371719A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-09 | 1953-07-11 | 1954-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-09 | 1957-07-11 | 1958-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-09 | 1961-07-11 | 1962-01-10 | $7700.00 | Window Closed / Lapsed |