US4335235A
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Crystalline co-polybenzyls preparation
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1980-10-20
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Granted: 1982-06-15
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Expires: 2000-10-20
Abstract
Abstract Crystalline co-polybenzyls are prepared by the polymerization of 2,5-dimethylbenzyl chloride with a benzyl halide of the same series.
Inventors
- 👤 John E. Chandler
- 👤 Robert W. Lenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:00
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A process of preparing crystalline polybenzyls represented by the structural formula: ##STR3## wherein R 1 and R 2 are the same or different C 1 -C 6 alkyl groups, when one of R 1 or R 2 is methyl the other of R 1 and R 2 is a C 2 -C 6 alkyl group, a is 98.9% to about 82 mol percent, b is 1.1 to about 18 mol percent, comprising copolymerizing 2,5-dimethylbenzyl halide with a benzyl halide represented by the structural formula: ##STR4## wherein R 1 and R 2 are as above and X is a halogen atom, in the presence of a catalyst comprising an alkylaluminum compound and a transition metal halide selected from the group consisting of titanium halides and oxyhalides and vanadium halides and oxyhalides, the molar ratio of alkylaluminum compound to transition metal halide not exceeding 1.
Claim 2
Dependent Claim
143 words
A process of preparing crystalline polybenzyls represented by the structural formula: ##STR3## wherein R 1 and R 2 are the same or different C 1 -C 6 alkyl groups, when one of R 1 or R 2 is methyl the other of R 1 and R 2 is a C 2 -C 6 alkyl group, a is 98.9% to about 82 mol percent, b is 1.1 to about 18 mol percent, comprising copolymerizing 2,5-dimethylbenzyl halide with a benzyl halide represented by the structural formula: ##STR4## wherein R 1 and R 2 are as above and X is a halogen atom, in the presence of a catalyst comprising an alkylaluminum compound and a transition metal halide selected from the group consisting of titanium halides and oxyhalides and vanadium halides and oxyhalides, the molar ratio of alkylaluminum compound to transition metal halide not exceeding 1.
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) | 1985-06-14 | 1985-12-14 | 1986-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-14 | 1989-12-14 | 1990-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-14 | 1993-12-14 | 1994-06-15 | $7700.00 | Window Closed / Lapsed |