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US2857368A
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Process for the polymerization of resins for use in paste-like dispersions
Assignee: Dow Chemical Co
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Filing: 1956-03-26
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Granted: 1958-10-21
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Expires: 1976-03-26
Abstract
No abstract record available.
Inventors
- 👤 Robert B Ingraham
- 👤 Glen L Gunderman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:52
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06; C08F265/00; C08F265/10; Y; Y10; Y10S; Y10S526/00; Y10S526/909
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN A PROCESS FOR PREPARING POLYVINYL CHLORIDE SUITABLE FOR USE IN PASTE RESIN DISPERSIONS IN A FORM CAPABLE OF EASY DEWATERING COMPRISING THE SEQUENTIAL STEPS OF DISPERSING VINYL CHLORIDE AS THE SOLE MONOMERIC MATERIAL INTO AN AQUEOUS PHASE CONTAINING A WATER-SOLUBLE POLYMERIZATION CATALYST, SUBJECTING SAID DISPERSION TO AGITATION AT A POLYMERIZATION TEMPERATURE OF NOT MORE THAN 45*C., AND ALLOWING POLYMERIZATION TO PROCEED TO FROM 70 TO 90 PERCENT CONVERSION, THE IMPROVEMENT CONSISTING IN ADDING TO SAID DISPERSION PRIOR TO POLYMERIZATION FROM 0.002 TO 0.05 PERCENT BY WEIGHT BASED ON THE WEIGHT OF SAID MONOMER OF A WATER SOLUBLE, HIGH MOLECULAR WEIGHT POLYMER OF ACRYLAMIDE.
Claim 2
Dependent Claim
104 words
IN A PROCESS FOR PREPARING POLYVINYL CHLORIDE SUITABLE FOR USE IN PASTE RESIN DISPERSIONS IN A FORM CAPABLE OF EASY DEWATERING COMPRISING THE SEQUENTIAL STEPS OF DISPERSING VINYL CHLORIDE AS THE SOLE MONOMERIC MATERIAL INTO AN AQUEOUS PHASE CONTAINING A WATER-SOLUBLE POLYMERIZATION CATALYST, SUBJECTING SAID DISPERSION TO AGITATION AT A POLYMERIZATION TEMPERATURE OF NOT MORE THAN 45*C., AND ALLOWING POLYMERIZATION TO PROCEED TO FROM 70 TO 90 PERCENT CONVERSION, THE IMPROVEMENT CONSISTING IN ADDING TO SAID DISPERSION PRIOR TO POLYMERIZATION FROM 0.002 TO 0.05 PERCENT BY WEIGHT BASED ON THE WEIGHT OF SAID MONOMER OF A WATER SOLUBLE, HIGH MOLECULAR WEIGHT POLYMER OF ACRYLAMIDE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |