Patent US3846390A successfully refreshed from Google Patents.
US3846390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing polyvinyl chloride in the presence of alkyl thioglycolate as a chain transfer agent
Assignee: Sumitomo Chemical Co Ltd
•
Filing: 1972-03-23
•
Granted: 1974-11-05
•
Expires: 1992-03-23
Abstract
Abstract When vinyl chloride or a monomeric mixture of vinyl chloride and an other ethylenically unsaturated monomer copolymerizable therewith is subjected to polymerization in the presence of a alkyl thioglycolate, vinyl chloride polymers with properly low average degree of polymerization suitable with a processing can be obtained.
Inventors
- 👤 I Ito
- 👤 S Ito
- 👤 T Emura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:35
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
90 words
A PROCESS FOR PRODUCING VINYL CHLORIDE POLYMERS WHICH COMPRISES POLYMERIZING VINYL CHLORIDE OR A MONOMERIC MIXTURE COMPRISING AT LEAST 80 PERCENT BY WEIGHT OF VINYL CHLORIDE AND UP TO 20 PERCENT BY WEIGHT OF AN OTHER ETHYLENICALLY UNSATURATED MONOMER COPOLYMERIZABLE THEREWITH AT A TEMPERATURE BETWEEN ABOUT 50*C AND ABOUT 70*C IN AN AQUEOUS MEDIUM IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF AN OILSOLUBLE CATALYST AND A WATER-SOLUBLE CATALYST AND 0.01 TO 2 PARTS BY WEIGHT OF AN ALKYL THIOGLYCOLATE CHAIN TRANSFER AGENT OF THE FORMULA:
Claim 2
Dependent Claim
90 words
A PROCESS FOR PRODUCING VINYL CHLORIDE POLYMERS WHICH COMPRISES POLYMERIZING VINYL CHLORIDE OR A MONOMERIC MIXTURE COMPRISING AT LEAST 80 PERCENT BY WEIGHT OF VINYL CHLORIDE AND UP TO 20 PERCENT BY WEIGHT OF AN OTHER ETHYLENICALLY UNSATURATED MONOMER COPOLYMERIZABLE THEREWITH AT A TEMPERATURE BETWEEN ABOUT 50*C AND ABOUT 70*C IN AN AQUEOUS MEDIUM IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF AN OILSOLUBLE CATALYST AND A WATER-SOLUBLE CATALYST AND 0.01 TO 2 PARTS BY WEIGHT OF AN ALKYL THIOGLYCOLATE CHAIN TRANSFER AGENT OF THE FORMULA:
Claim 3
Dependent Claim
28 words
A process according to claim 1 wherein said alkyl thioglycolate is selected from the group consisting of n-butyl thioglycolate, n-hexyl thioglycolate, n-octyl thioglycolate, 2-ethylhexyl thioglycolate and n-dodecyl thioglycolate.
Claim 4
Dependent Claim
34 words
A process according to claim 1 wherein said ethylenically unsaturated monomer is selected from the group consisting of fatty acid vinyl esters, alkyl vinyl ethers, acrylic esters, methacrylic esters, vinylidene chloride and styrene derivatives.
Claim 5
Dependent Claim
55 words
A process according to claim 1 wherein the oil-soluble catalyst is selected from the group consisting of benzoyl peroxide, lauroyl peroxide, diisopropyl peroxydicarbonate, and azobisisobutylonitrile, and the water-soluble catalyst is selected from the group consisting of hydrogen peroxide, potassium persulfate, ammonium persulfate and a redox system of the above with an iron salt or sulfate.
References Cited (Backward Citations)
US2635090A
Cited
US2740773A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |