US2833754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of suspension polymerization of vinyl halide utilizing gelatin as dispersingagent
Assignee: Diamond Shamrock Corp
•
Filing: 1955-03-14
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Granted: 1958-05-06
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Expires: 1975-03-14
Abstract
No abstract record available.
Inventors
- 👤 Roger G Richards
- 👤 James J Lukes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:14
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/12; C08F2/16; C08F2/18; C08F14/00; C08F14/02; C08F14/04; C08F14/06; Y; Y10; Y10S; Y10S526/00; Y10S526/909
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A PROCESS FOR PRODUCING A HIGH QUALITY POLYMER WHICH COMPRISES INTIMATELY MIXING IN WATER AN ETHYLENICALLY UNSATURATED MONOMER CONTAINING AT LEAST ABOUT 85% VINYL HALIDE AND A DISPERSING AGENT CONSISTING ESSENTIALLY OF GELATIN IN AN AMOUNT FROM ABOUT 0.1 TO 0.45% BY WEIGHT OF MONOMER, THE RESULTING SOLUTION HAVING A PH AT LEAST AS HIGH AS THE ISOELECTRIC PH OF THE GELATIN, THOROUGHLY AGITATING THIS AQUEOUS POLYMERIZATION MEDIUM TO FORM A STABLE DISPERSION OF MONOMER IN WATER, THEREAFTER ADDING AN ACID TO LOWER THE PH OF THE AQUEOUS POLYMERIZATION MEDIUM TO A VALUE WITHIN THE RANGE FROM 2 TO 5, INCLUSIVE, BELOW THE ISOELECTRIC PH OF THE GELATIN, AND POLYMERIZING SAID MONOMER IN THE THUS-FORMED SUSPENSION.
Claim 2
Dependent Claim
116 words
A PROCESS FOR PRODUCING A HIGH QUALITY POLYMER WHICH COMPRISES INTIMATELY MIXING IN WATER AN ETHYLENICALLY UNSATURATED MONOMER CONTAINING AT LEAST ABOUT 85% VINYL HALIDE AND A DISPERSING AGENT CONSISTING ESSENTIALLY OF GELATIN IN AN AMOUNT FROM ABOUT 0.1 TO 0.45% BY WEIGHT OF MONOMER, THE RESULTING SOLUTION HAVING A PH AT LEAST AS HIGH AS THE ISOELECTRIC PH OF THE GELATIN, THOROUGHLY AGITATING THIS AQUEOUS POLYMERIZATION MEDIUM TO FORM A STABLE DISPERSION OF MONOMER IN WATER, THEREAFTER ADDING AN ACID TO LOWER THE PH OF THE AQUEOUS POLYMERIZATION MEDIUM TO A VALUE WITHIN THE RANGE FROM 2 TO 5, INCLUSIVE, BELOW THE ISOELECTRIC PH OF THE GELATIN, AND POLYMERIZING SAID MONOMER IN THE THUS-FORMED SUSPENSION.
References Cited (Backward Citations)
US2528469A
Cited
US2655496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |