US2719142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerizing polyethylenically unsaturated compounds in an aqueous medium
Assignee: Shell Development Co
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Filing: 1952-02-19
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Granted: 1955-09-27
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Expires: 1972-02-19
Abstract
No abstract record available.
Inventors
- 👤 Christiaan Pieter Van Dijk
- 👤 Franciscus Johannes Freder Der
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:06
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A PROCESS FOR PREPARING A HEAT-CONVERTIBLE POLYMER OF A SUBSTANTIALLY WATER-INSOLUBLE POLYETHYLENICALLY UNSATURATED ORGANIC COMPOUND WHICH POLYMER IS SUBSTANTIALLY FREE OF BRANCHING AND CROSS-LINKING, WHICH COMPRISES POLYMERIZING THE SAID UNSATURATED COMPOUND AT A TEMPERATURE NOT IN EXCESS OF 95* C. IN A TWO PHASE SYSTEM COMPRISING A SOLUTION OF AN EMULSIFIER IN WATER AS THE CONTINUOUS PHASE AND A DISCONTINUOUS PHASE CONTAINING THE SAID UNSATURATED ORGANIC COMPOUND SO AS TO EFFECT AT LEAST A 50% CONVERSION OF MONOMER TO POLYMER AND AT THE SAME TIME MAINTAINING THE CONCENTRATION OF THE RESULTING POLYMER IN THE REACTION ZONE AT ALL TIMES BELOW THAT LEVEL AT WHICH GELATION OCCURS.
Claim 2
Dependent Claim
106 words
A PROCESS FOR PREPARING A HEAT-CONVERTIBLE POLYMER OF A SUBSTANTIALLY WATER-INSOLUBLE POLYETHYLENICALLY UNSATURATED ORGANIC COMPOUND WHICH POLYMER IS SUBSTANTIALLY FREE OF BRANCHING AND CROSS-LINKING, WHICH COMPRISES POLYMERIZING THE SAID UNSATURATED COMPOUND AT A TEMPERATURE NOT IN EXCESS OF 95* C. IN A TWO PHASE SYSTEM COMPRISING A SOLUTION OF AN EMULSIFIER IN WATER AS THE CONTINUOUS PHASE AND A DISCONTINUOUS PHASE CONTAINING THE SAID UNSATURATED ORGANIC COMPOUND SO AS TO EFFECT AT LEAST A 50% CONVERSION OF MONOMER TO POLYMER AND AT THE SAME TIME MAINTAINING THE CONCENTRATION OF THE RESULTING POLYMER IN THE REACTION ZONE AT ALL TIMES BELOW THAT LEVEL AT WHICH GELATION OCCURS.
References Cited (Backward Citations)
US2465363A
Cited
US2537334A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-09-26 | 1959-03-28 | 1959-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-26 | 1963-03-28 | 1963-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-26 | 1967-03-28 | 1967-09-27 | $7700.00 | Window Closed / Lapsed |