Patent US3629220A successfully refreshed from Google Patents.
US3629220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Homopolymerization of vinyl chloride with acyl sulfonyl peroxide initiator
Assignee: Pennwalt Corp
•
Filing: 1969-06-09
•
Granted: 1971-12-21
•
Expires: 1989-06-09
Abstract
Abstract VINYL CHLORIDE IS POLYMERIZED AT A TEMPERATURE BELOW ABOUT +20*C. TO SOLID HOMOPOLYMER, USING AN INTIATOR SYSTEM OF ACYL SULFONYL PEROXIDE, CERTAIN AMINES AND, OPTIONALLY, REDUCING AGENT. EXAMPLE: SUPENSION POLYMERIZATION OF VINYL CHLORIDE AT 0*C. FOR 16 HOURS GAVE 95% CONVERSION USING ACETYL T-BUTYLSULFONYL PEROXIDE, ASCORBIC ACID, AND N,N-DIMETHYSLANILINE, IN WEIGHT PARTS OF 1/0.44/0.06 PER 100 PARTS BY WEIGHT OF MONOMER. IN THE ABSENCE OF ASCORBIC ACID, AND 82% CONVERSION IS OBTAINED. THE SULFONYL PEROXIDE ALONE GIVES 30% CONVERSION.
Inventors
- 👤 Jose Sanchez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:01
CPC Classifications
C; C08; C08F; C08F114/00; C08F114/02; C08F114/04; C08F114/06; Y; Y10; Y10S; Y10S526/00; Y10S526/91
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |