US3575905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat stabilizers for polyvinyl chloride and similar polymers
Assignee: Millennium Petrochemicals Inc
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Filing: 1968-02-01
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Granted: 1971-04-20
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Expires: 1988-02-01
Abstract
Abstract POLYMERS AND COPLYMERS OF VINYL CHLORIDE CAN BE THERMALLY STABILIZED BY ADDING AN ARYL ALKYL PHOSPHITE TOGETHER WITH A ZINC SALT IN AN AMOUNT CORRESPONDING TO BETWEEN 0.0005 AND 0.005 PART OF DIVALENT ZINC. IN THESE AMOUNTS, ZINC EFFECTIVELY RETARDS THERMAL DISCOLORATION WITHOUT CAUSING SUDDEN DEGRADATION. THE STABILIZED POLYMER COMPOSITIONS MAY ALSO CONTAIN OTHER CONVENTIONAL PLASTICS ADDITIVES.
Inventors
- 👤 Philip H Rhodes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:07
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098; C08K5/49; C08K5/51; C08K5/52; C08K5/524; C08K5/526
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |