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US3658778A
Expired / Lapsed
US
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Process for the preparation of vinylidene chloride-vinyl chloride copolymers
Assignee: Kureha Corp
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Filing: 1969-12-29
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Granted: 1972-04-25
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Expires: 1989-12-29
Abstract
Abstract PROCESS FOR THE SUSPENSION POLYMERIZATION OF VINYLIDENE CHLORIDE AND VINYL CHLORIDE IN THE PRESENCE OF A PEROXYDICARBONATE INITIATOR COMPRISING THE ADDITION TO THE POLYMERIZATION SYSTEM, AT THE COMPLETION OF POLYMERIZATION, A THIODIPROPIONIC ACID ALKYL ESTER OR A MIXTURE OF A THIODIPROPIONIC ACID ALKYL ESTER AND BUTYLHYDROXYANISOLE. THE PROCESS PROVIDES ORDORLESS VINYLIDENE CHLORIDE-VINYL CHLORIDE COPOLYMERS.
Inventors
- 👤 Yasushi Toyoda
- 👤 Kunizo Kido
- 👤 Hidetora Kashio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:26
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/02; C08F214/04; C08F214/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |