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

1986-09-11

1988-05-03

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 93, 526 94, 526335, C08F 222, C08F 216, C08F 3606, C08F 3600

Patent

active

047421371

ABSTRACT:
An aqueous dispersion of polymer particles each consisting essentially of (a) a syndiotactic 1,2-polybutadiene having 70% or more of unsaturated hydrocarbon groups in the side chains and having a melting point of 70.degree. 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 said particles having an average diameter of 10 .mu.m or less. Said aqueous dispersion can be produced by a process comprising steps of adding, to an aqueous dispersion of a first catalyst component solution, a conjugated diene monomer and a second catalyst component and polymerizing said conjugated diene monomer, characterized in that the first catalyst component 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 compound 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.

REFERENCES:
patent: 4153767 (1979-05-01), Ueno
patent: 4429085 (1984-01-01), Henderson
patent: 4463146 (1984-07-01), Donbar
patent: 4501867 (1985-02-01), Ueno

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