US3953385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel products and process
Assignee: Arkema Inc
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Filing: 1974-12-05
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Granted: 1976-04-27
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Expires: 1994-12-05
Abstract
Abstract Cellular vinyl chloride polymers are prepared in the presence of a blowing agent and a diorganotin dimercaptide such as di-n-butyltin bis(dodecyl mercaptide). These organotin compounds are unique in that they activate the blowing agent to achieve maximum gas evolution at conventional processing temperatures while imparting a superior level of heat stability to the polymer. The dimercaptide is preferably employed in combination with a specified organotin derivative of a carboxylic acid, alcohol or phenol and/or metal salts of carboxylic acids containing between 4 and 18 carbon atoms wherein the metal is selected from Group IIB of the Periodic Table.
Inventors
- 👤 Robert D. Dworkin
- 👤 Adam J. Ejk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:16
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J9/101; C08J9/0014; C08J9/0052; C08K; C08K5/00; C08K5/56; C08K5/57; C08K5/58; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; Y; Y10; Y10S; Y10S521/00; Y10S521/909
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
87 words
A composition for preparing rigid cellular vinyl chloride polymers, said composition comprising a. 100 parts by weight of a vinyl chloride homopolymer or a copolymer of vinyl chloride with a copolymerizible ethylenically unsaturated monomer, b. between 0.1 and 10 parts of a blowing agent, and c. between 0.1 and 10 parts of a combined blowing agent activator and heat stabilizer which in turn comprises a diorganotin mercaptide compound of the formula R 2 1 Sn(SR 2 ) 2 wherein R 1 and R 2 are hydrocarbyl groups.
Claim 2
Dependent Claim
87 words
A composition for preparing rigid cellular vinyl chloride polymers, said composition comprising a. 100 parts by weight of a vinyl chloride homopolymer or a copolymer of vinyl chloride with a copolymerizible ethylenically unsaturated monomer, b. between 0.1 and 10 parts of a blowing agent, and c. between 0.1 and 10 parts of a combined blowing agent activator and heat stabilizer which in turn comprises a diorganotin mercaptide compound of the formula R 2 1 Sn(SR 2 ) 2 wherein R 1 and R 2 are hydrocarbyl groups.
Claim 3
Dependent Claim
28 words
A composition as set forth in claim 1 wherein the diorganotin compound is selected from the group consisting of dibutyltin-S,S'-bis(dodecyl mercaptide), dibutyltin-S,S'-bis(tridecyl mercaptide), dibutyltin-S,S'-bis(benzyl mercaptide) and dimethyltin-S,S'-bis(dodecyl mercaptide).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-27 | 1979-10-27 | 1980-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-27 | 1983-10-27 | 1984-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-27 | 1987-10-27 | 1988-04-27 | $7700.00 | Window Closed / Lapsed |