Patent DE439019C successfully refreshed from Google Patents.
Patent US3682873A successfully refreshed from Google Patents.
US3682873A
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US
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Process for producing spherical styrene-acrylonitrile copolymer particles of controlled particle diameter
Assignee: Daicel Corp
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Filing: 1970-09-11
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Granted: 1972-08-08
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Expires: 1990-09-11
Abstract
Abstract A PROCESS FOR PREPARING STYRENE-ACRYLONITRILE COPOLYMERS IN WHICH A STIRRED MIXTURE OF STYRENE-ACRYLONITRILE IS PRELIMINARILY POLYMERIZED IN BULK IN THE PRESENCE OF CATALYST UNTIL THE CONVERSION REACHES TO A VALUE FROM 10 TO 40% AND THEN THE REACTED MIXTURE IS SUSPENDED AND DISPERSED IN AN AQUEOUS MEDIUM CONTAINING SUSPENSION STABILIZER AND THE REMAINING MONOMER IS SUBSTANTIALLY COMPLETELY POLYMERIZED IN THE STATE OF AN AQUEOUS SUSPENSION TO FORM GENUINELY SPHERICAL COPOLYMER PARTICLES HAVING INCREASED DIAMETER WHICH ARE USEFUL FOR THE PREPARATION OF A POROUS PRODUCT BY POINT-TO-POINT ADHESION OF SPHERICAL PARTICLES.
Inventors
- 👤 Yukio Hozumi
- 👤 Yuzo Sonoyama
- 👤 Masaru Omata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:02
CPC Classifications
C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/08; C08F212/10; C08F2/00; C08F2/12; C08F2/16; C08F20/00; C08F20/02; C08F20/42; C08F20/44; Y; Y10; Y10S; Y10S526/00; Y10S526/909; Y10S526/922
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |