Ceskoslovenska Akademie Ved

Ludek Toman

Miroslav Marek

Jan Pecka

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.

Method for controlled radiation polymerization of olefinic monomers

Method for controlled radiation polymerization of olefinic monomors

Method of radiation polymerization and copolymerization of isobutylene

Method for radiation polymerization and copolymerization of isobutylene

The invention is for a process for the controlled polymerization and copolymerization of monoolefinic and diolefinic monomers, which are able to polymerize by a cationic mechanism and particularly for the polymerization of isobutylene and copolymerization thereof with butadiene in the production of vulcanizable butyl rubber. The polymerization reaction is initiated by halides of tetravalent vanadium, titanium and zirconium. In the presence of activating agents, which are chozen from alkali metals, alkaline earth metals, their amalgams and the hydrogen compounds (hydrides) of the metals of Groups I, II, III and IV of the Periodic Table accelerated by irradiation, particularly by light. The polymerization may be carried out at 0.degree. C to - 140.degree. C with the molecular ratio of the initiator to the activating agent ranging from 100 to 0.01 and its rate is controlled by the intensity of irradiation and by dosing of the catalyst components.

Process for controlled radiation polymerization and copolymerization of

Process for polymerization and copolymerization of momo-olefinic monomers, such as isobutylene, either with one another or with dienes, catalyzed by tetravalent metal halides, and initiated or accelerated by the action of ultraviolet, visible or infrared light. The polymerization or copolymerization can be affected with or without solvent. Suitable solvents are aliphatic, aromatic or halogenated hydrocarbons. The polymerization is carried out at a temperature in a range of from about -140.degree. C. to about +30.degree. C.

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Prague, Czechia

Ludek Toman