Polymer particles and process for producing the same

Details Polymer particles and process for producing the same Polymer particles and process for producing the same

C - Chemistry, Metallurgy

08

F

400/1116, 400/20

C08F 36/04 (2006.01) C08F 279/02 (2006.01)

Patent

CA 1269487

ABSTRACT OF THE DISCLOSURE An aqueous dispersion of polymer particles each consisting essentially of (a) a syndiotactic 1,2-polybutadi ene having 70% or more of unsaturated hydrocarbon groups in the side chains and having a melting point of 70°C or higher, (b) a polymer mixture of said polybutadiene (a) and other polymer in the form that (a) and (b) co-exist in the same particle, or (c) a copolymer obtained by graft- polymerizing a conjugated diene and/or other polymerizable monomer on said polybutadiene (a), each of sald particles having an average diameter of 10 µm or less. Said aqueous dispersion can be produced by a process comprising steps of adding, to an aqueous dispersion of a first catalyst com- ponent solution, a conjugated diene monomer and a second catalyst component and polymerizing said conjugated diene monomer, characterized in that the first catalyst com- ponent solution contains (A) a cobalt compound, (B) at least one member selected from the group consisting of alkali metals, organometallic compounds of metals of Groups I to III of the Periodic Table and hydrides of metals of Groups I to III of the Periodic Table, and (C) 1 to 1,000 moles, per mole of the cobalt compound (A), of a conjugated diene com- pound and then the second catalyst component is at least one compound selected from the group consisting of carbon disulfide, phenylisothiocyanic acid and a xanthogen compound.

484742

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