Patent US3629211A successfully refreshed from Google Patents.
US3629211A
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US
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Copolymers of styrene and process for preparation thereof
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1970-06-30
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Granted: 1971-12-21
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Expires: 1990-06-30
Abstract
Abstract COPOLYMERS OF STYRENE HAVING IMPROVED HEAT RESISTANCE AND MECHANICAL PORPERTIES ARE PROVIDED BY COPOLYMERZING A STYRENE MONOMER WITH AN M-ALKYL-A-ALKYLSTYRENE AND A P-ALKYL-A-ALKYLSTYRENE. A MIXTURE OF A PREDOMINANTLY STYRENE MONOMER AND ANTOHER COPOLYMERIZABLE VINYL MONOMER CAN ALSO BE USED IN PLACE OF THE STYRENE MONOMER ALONE. THE COMBINED AMOUNT OF THE NUCLEAR-SUBSTITUTED ALKYL-A-ALKYLSTYRENES IS 100-10, PREFERABLY 70-25 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF THE STYRENE MONOMER OF MIXTURE. THE WEIGHT RATIO FO THE M-ALKYL-A-ALKYLSTYRENE TO THE P-ALKYL-A-ALKYLSTYRENE RANGES FROM 35:65 TO 85:15, PREFERABLY FROM 45:55 TO 75:25.
Inventors
- 👤 Meguma Nozaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:33
CPC Classifications
C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/12; C08F212/08
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) | 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 |