US4012304A
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Method of radiation polymerization and copolymerization of isobutylene by a cationic mechanism
Assignee: Czech Academy of Sciences
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Filing: 1975-04-03
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Granted: 1977-03-15
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Expires: 1995-04-03
Abstract
Abstract Method for the cationic polymerization of at least one olefinic monomer and more particularly the homopolymerization of a mono-olefinic monomer such as isobutylene and the copolymerization thereof with a di-olefinic monomer (diene) such as butadiene and optionally another mono-olefinic monomer in the presence of, as initiator of a halide of tetravalent vanadium, titanium and zirconium, an activator and under the influence of visible ultraviolet or infra-red light.
Inventors
- 👤 Miroslav Marek
- 👤 Ludek Toman
- 👤 Jan Pecka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:48
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/04; C08F10/08; C08F10/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
150 words
A method for the polymerization and copolymerization of mono-olefinic monomers polymerizable by a cationic mechanism, which comprises subjecting to a source of light selected from the group consisting of ultraviolet light, visible light, and infrared light at a temperature between about 0° C. and about -140° C. a polymerizable mixture selected from the group consisting of isobutylene and mixtures of isobutylene with at least one diolefinic monomer selected from the group consisting of butadiene and isoprene in the presence of at least one halide catalyst selected from the group consisting of tetravalent vanadium, titanium and zirconium halides and in the presence of at least one activator for said halide catalyst selected from the group consisting of finely divided aluminum, carbon, copper, iron, and zinc, the molar ratio of said halide catalyst to said activator ranging from 10 3 to 10.sup. -3 part of halide catalyst to 1 part of activator.
Claim 2
Independent Claim
150 words
A method for the polymerization and copolymerization of mono-olefinic monomers polymerizable by a cationic mechanism, which comprises subjecting to a source of light selected from the group consisting of ultraviolet light, visible light, and infrared light at a temperature between about 0° C. and about -140° C. a polymerizable mixture selected from the group consisting of isobutylene and mixtures of isobutylene with at least one diolefinic monomer selected from the group consisting of butadiene and isoprene in the presence of at least one halide catalyst selected from the group consisting of tetravalent vanadium, titanium and zirconium halides and in the presence of at least one activator for said halide catalyst selected from the group consisting of finely divided aluminum, carbon, copper, iron, and zinc, the molar ratio of said halide catalyst to said activator ranging from 10 3 to 10.sup. -3 part of halide catalyst to 1 part of activator.
Claim 3
Dependent Claim
15 words
A method according to claim 1, in which the plymerizable mixture consists essentially of isobutylene.
Claim 4
Dependent Claim
17 words
A method according to claim 1, in which the polymerizable mixture consists essentially of isobutylene and butadiene.
Claim 5
Dependent Claim
17 words
The method according to claim 1 in which the polymerizable mixture consists essentially of isobutylene and isoprene.
Claim 6
Dependent Claim
18 words
The method according to claim 1 in which the polymerizable mixture consists essentially of isobutylene, butadiene and isoprene.
References Cited (Backward Citations)
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US2924561A
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US3462403A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |