US2957858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous phase emulsion polymerization of vinyl chloride, and products produced thereby
Assignee: Rubber Corp of America
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Filing: 1957-02-27
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Granted: 1960-10-25
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Expires: 1977-02-27
Abstract
No abstract record available.
Inventors
- 👤 Robert T O'donnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:55
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
THE METHOD OF EMULSION POLYMERIZATION OF VINYL CHLORIDE TO PRODUCE PLATISOLS IN THE AQUEOUS PHASE WHICH COMPRISES EMULSIFYING VINYL CHLORIDE MONOMER WITH WATER, A WATER-SOLUBLE OXYGEN-DONATING CATALYST FROM THE GROUP CONSISTING OF HYDROGEN PEROXIDE, POTASSIUM PERSULPHATE, SODIUM PERSULPHATE, AMMONIUM PERSULPHATE, AND MIXTURES THEREOF, A CATALYST ACTIVATOR FROM THE GROUP CONSISTING OF SODIUM PYROPHOSPHATE, DISODIUM MONOHYDROGEN PHOSPHATE, AND MIXTURES THEREOF, AND AN EMULSIFYING AGENT, COMPRISING A MEMBER OF THE GROUP CONSISTING OF AMMONIUM STEARATE, AMMONIUM LAURATE, AMMONIUM PALMITATE, AMMONIUM MYRISTATE, AND MIXTURES THEREOF, THE COMPONENTS BEING PRESENT IN THE FOLLOWING PROPORTIONS: VINYL CHLORIDE MONOMER 100 WATER 88-400 CATALYST .05-.5 CATALYST ACTIVATOR 0.4-0.5 EMULSIFYING AGENT 0.1-0.5 THE EMULSION HAVING A PH BETWEEN 8.0 AND 10.5, SUBJECTING THE EMULSION TO HEAT, PRESSURE AND AGITATION UNTIL POLYMERIZATION HAS TAKEN PLACE, AND THEN SEPARATING THE POLYMER THEREFROM.
Claim 2
Independent Claim
132 words
THE METHOD OF EMULSION POLYMERIZATION OF VINYL CHLORIDE TO PRODUCE PLATISOLS IN THE AQUEOUS PHASE WHICH COMPRISES EMULSIFYING VINYL CHLORIDE MONOMER WITH WATER, A WATER-SOLUBLE OXYGEN-DONATING CATALYST FROM THE GROUP CONSISTING OF HYDROGEN PEROXIDE, POTASSIUM PERSULPHATE, SODIUM PERSULPHATE, AMMONIUM PERSULPHATE, AND MIXTURES THEREOF, A CATALYST ACTIVATOR FROM THE GROUP CONSISTING OF SODIUM PYROPHOSPHATE, DISODIUM MONOHYDROGEN PHOSPHATE, AND MIXTURES THEREOF, AND AN EMULSIFYING AGENT, COMPRISING A MEMBER OF THE GROUP CONSISTING OF AMMONIUM STEARATE, AMMONIUM LAURATE, AMMONIUM PALMITATE, AMMONIUM MYRISTATE, AND MIXTURES THEREOF, THE COMPONENTS BEING PRESENT IN THE FOLLOWING PROPORTIONS: VINYL CHLORIDE MONOMER 100 WATER 88-400 CATALYST .05-.5 CATALYST ACTIVATOR 0.4-0.5 EMULSIFYING AGENT 0.1-0.5 THE EMULSION HAVING A PH BETWEEN 8.0 AND 10.5, SUBJECTING THE EMULSION TO HEAT, PRESSURE AND AGITATION UNTIL POLYMERIZATION HAS TAKEN PLACE, AND THEN SEPARATING THE POLYMER THEREFROM.
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) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |