US3574177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of acrylonitrile polymers
Assignee: Japan Exlan Co Ltd
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Filing: 1968-05-08
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Granted: 1971-04-06
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Expires: 1988-05-08
Abstract
Abstract THE SOLUTION POLYMERIZATION OF ACRYLONITRILE POLYMERS AND COPOLYMERS IS FACILITATED WHEN IT IS CONDUCTED UNDER AGITATION IN THE PRESENCE OF AN INERT DISPERSION MEDIUM. THE SOLVENT USED IS ONE THAT WILL DISSOLVE BOTH THE MONOMER AND THE RESULTING POLYMER. THE DISPERSION MEDIUM IS A LIQUID THAT IS NOT UNIFORMLY MISCIBLE WITH THE SOLVENT AND IT WILL NOT DISSOLVE EITHER THE MONOMER OR THE POLYMER. UPON PERMITTING THE REACTION PRODUCT, A DISPERSION, TO STAND QUIETLY IT SEPARATES INTO TWO LIQUID PHASES THAT CAN BE SEPARATED BY DECANTATION. THE PREFERRED DISPERSION MEDIA ARE LIQUID HYDROCARBONS HALOGENATED OR NOT, THAT HAVE A BOILING POINT ABOVE 268*C.
Inventors
- 👤 Akira Nakajima
- 👤 Kenji Takeya
- 👤 Yukio Shimosaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:54
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/42; C08F20/44
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |