US3403137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processes for preparing ethylene/vinyl chloride copolymers
Assignee: Monsanto Co
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Filing: 1963-11-08
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Granted: 1968-09-24
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Expires: 1983-11-08
Abstract
No abstract record available.
Inventors
- 👤 Harry M Andersen
- 👤 James D Gabbert
- 👤 Oliver De S Deex
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:21
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/02; C08F214/04; C08F214/06; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
IN A PROCESS FOR PREPARING ETHYLENE/VINYL CHLORIDE COPOLYMERS WHICH COMPRISES THE REDOX POLYMERIZATION OF ETHYLENE AND VINYL CHLORIDE IN AN AQUEOUS EMULSION SYSTEM AT A PH OF 7 TO 12 AND AT SUPERATMOSPHERIC PRESSURE UP TO 50,000 P.S.I. EMPLOYING A PERSULFATE OXIDIZING AGENT AND A REDUCING AGENT SELECTED FROM THE GROUP CONSISTING OF AMMONIUM AND ALKALI METAL SULFITES, THIOSULFATES, BISULFITES, HYDROSULFITES, AND FORMALDEHYDE SULFOXYLATES, AND VERSIVALENT METAL CONVERTIBLE BETWEEN DIFFERENT POSITIVE VALENCE STATES BY OXIDATION AND REDUCTION REACTIONS, THE STEPS (1) CONTROLLING THE POLYMERIZATION REACTION BY ADDING THE REDUCING AGENT TO THE REMAINING COMPONENTS OF THE POLYMERIZATION CHARGE BOTH TO INITIATE POLYMERIZATION AND ALSO SUBSEQUENTLY DURING THE POLYMERIZATION AS REQUIRED TO MAINTAIN THE DESIRED RATE OF POLYMERIZATION AND OBTAIN HIGH CONVERSION OF MONOMERS TO POLYMER AND (2) ADDING ABOUT 0.1 TO 20 PARTS BY WEIGHT OF EMULSIFIER AND 0.01 TO 10 PARTS BY WEIGHT OF PROTECTIVE COLLOID PER 100 PARTS OF COMBINED MONOMERS INITIALLY PRESENT.
Claim 2
Dependent Claim
155 words
IN A PROCESS FOR PREPARING ETHYLENE/VINYL CHLORIDE COPOLYMERS WHICH COMPRISES THE REDOX POLYMERIZATION OF ETHYLENE AND VINYL CHLORIDE IN AN AQUEOUS EMULSION SYSTEM AT A PH OF 7 TO 12 AND AT SUPERATMOSPHERIC PRESSURE UP TO 50,000 P.S.I. EMPLOYING A PERSULFATE OXIDIZING AGENT AND A REDUCING AGENT SELECTED FROM THE GROUP CONSISTING OF AMMONIUM AND ALKALI METAL SULFITES, THIOSULFATES, BISULFITES, HYDROSULFITES, AND FORMALDEHYDE SULFOXYLATES, AND VERSIVALENT METAL CONVERTIBLE BETWEEN DIFFERENT POSITIVE VALENCE STATES BY OXIDATION AND REDUCTION REACTIONS, THE STEPS (1) CONTROLLING THE POLYMERIZATION REACTION BY ADDING THE REDUCING AGENT TO THE REMAINING COMPONENTS OF THE POLYMERIZATION CHARGE BOTH TO INITIATE POLYMERIZATION AND ALSO SUBSEQUENTLY DURING THE POLYMERIZATION AS REQUIRED TO MAINTAIN THE DESIRED RATE OF POLYMERIZATION AND OBTAIN HIGH CONVERSION OF MONOMERS TO POLYMER AND (2) ADDING ABOUT 0.1 TO 20 PARTS BY WEIGHT OF EMULSIFIER AND 0.01 TO 10 PARTS BY WEIGHT OF PROTECTIVE COLLOID PER 100 PARTS OF COMBINED MONOMERS INITIALLY PRESENT.
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) | 1971-09-24 | 1972-03-25 | 1972-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-24 | 1976-03-25 | 1976-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-24 | 1980-03-25 | 1980-09-24 | $7700.00 | Window Closed / Lapsed |