US4827065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing p-isobutylstyrene and a starting compound therefor
Assignee: Eneos Corp
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Filing: 1985-07-10
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Granted: 1989-05-02
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Expires: 2005-07-10
Abstract
Abstract A method for producing p-isobutylstyrene which is characterized in that starting materials are inexpensive, processes are easy to be done and products are highly pure. The method comprises the step of catalytically cracking 1,1-bis(p-isobutylphenyl)ethane at temperatures in the range of 200 DEG to 650 DEG C. in the presence of a protonic acid catalyst and/or a solid acid catalyst to produce p-isobutylstyrene and isobutylbenzene, and at least a portion of said isobutylbenzene is recycled to produce said 1,1-bis(p-isobutylphenyl)ethane by reaction with acetaldehyde in the presence of sulfuric acid.
Inventors
- 👤 Isoo Shimizu
- 👤 Ryotaro Hirano
- 👤 Yasuo Matsumura
- 👤 Hideki Nomura
- 👤 Kazumichi Uchida
- 👤 Atsushi Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:17
CPC Classifications
C; C07; C07C; C07C4/00; C07C15/00; C07C15/12; C07C15/16; C07C15/40; C07C15/42; C07C15/44; C07C15/46; C07C45/00; C07C45/49; C07C45/50; C07C51/00; C07C51/10; C07C51/14; C07C51/16; C07C51/29; C07C57/00; C07C57/30; C07C2521/00; C07C2521/12; C07C2521/16; C07C2527/00; C07C2527/02; C07C2527/053; C07C2527/054; C07C2527/14; C07C2527/16; C07C2527/167; C07C2527/173; C07C2529/00; C07C2529/04; C07C2531/00; C07C2531/02; C07C2531/025; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
1 words
1,1-Bis(p-isobutylphenyl)ethane.
Claim 2
Dependent Claim
1 words
1,1-Bis(p-isobutylphenyl)ethane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |