Method for controlled radiation polymerization of olefinic monomers
AssigneeCeskoslovenska akademie ved
InventorsMiroslav Marek, Ludek Toman, Jan Pecka
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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.
Claims6
A method for the polymerization and and copolymerization of mono-olefinic monomers polymerizable by a cationic mechanism, which comprises subjecting to a source of light selected from a group consisting of ultraviolet light, visible light, and infrared light at a temperature between about 0.degree. C. and about -140.degree. C. a polymerizable mixture selected from the group consisting of (a) isobutylene, and (b) 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 an activator for said halide catalyst comprising a mixture of an aluminum alkoxide and an aluminum halide, the molar ratio of said halide catalyst to said activator ranging from 10.sup.3 to 10.sup.-3 part of halide catalyst to 1 part of activator.
Dependencies are inferred from the claim text.