Patent USRE17544E successfully refreshed from Google Patents.
Patent US3944535A successfully refreshed from Google Patents.
US3944535A
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Low temperature synthetic rubber and method of making same
Assignee: Covestro International SA
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Filing: 1955-04-18
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Granted: 1976-03-16
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Expires: 1975-04-18
Abstract
Abstract Butadiene or isoprene are polymerized in the presence of a catalyst prepared by the interaction of (a) an aluminum compound of the general formula R 2 AlX wherein R is an alkyl, cycloalkyl or aryl radical and X is hydrogen, halogen, or an alkyl, cycloalkyl or aryl radical, with (b) a metal halide selected from the group consisting of the chlorides, bromides and iodides of titanium and zirconium, the resulting polymer having a high degree of flexibility at low temperature.
Inventors
- 👤 Robert J. Slocombe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:38
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
42 words
A method for polymerizing 1,3-butadiene which comprises contacting said 1,3-butadiene with a catalyst consisting essentially of (a) a compound corresponding to the formula R 3 Al, wherein R is an alkyl radical having 2 to 4 carbon atoms and (b) titanium tetraiodide.
Claim 2
Independent Claim
42 words
A method for polymerizing 1,3-butadiene which comprises contacting said 1,3-butadiene with a catalyst consisting essentially of (a) a compound corresponding to the formula R 3 Al, wherein R is an alkyl radical having 2 to 4 carbon atoms and (b) titanium tetraiodide.
Claim 3
Dependent Claim
82 words
A process for producing rubbery vulcanizable polybutadiene which is characterized by improved flexibility at low temperatures, which process comprises polymerizing butadiene-1,3 in an inert hydrocarbon medium in the presence of a catalyst resulting from the interaction in said medium of (a) a trialkyl aluminum of the formula R 3 Al wherein R is an alkyl radical containing 2 to 8 carbon atoms and (b) titanium tetraiodide, the mole ratio of aluminum to titanium being from 0.3 to 1 to 15 to 1.
Claim 4
Dependent Claim
82 words
A process for producing rubbery vulcanizable polybutadiene which is characterized by improved flexibility at low temperatures, which process comprises polymerizing butadiene-1,3 in an inert hydrocarbon medium in the presence of a catalyst resulting from the interaction in said medium of (a) a trialkyl aluminum of the formula R 3 Al wherein R is an alkyl radical containing 2 to 8 carbon atoms and (b) titanium tetraiodide, the mole ratio of aluminum to titanium being from 0.3 to 1 to 15 to 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) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |