Dispersion polymerization of cycloolefins

Details Dispersion polymerization of cycloolefins Dispersion polymerization of cycloolefins

1981-11-16

1982-11-02

Levin, Stanford M.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

525211, 525247, 526169, 526201, 526283, C08F 208

Patent

active

043574491

ABSTRACT:
At least one cycloolefin monomer containing the norbornene group is polymerized by ring opening polymerization in a hydrocarbon diluent selected from C.sub.4 to C.sub.6 alkanes and isooctane that is a solvent for the monomer(s) but a nonsolvent for the resulting polymer, in the presence of a dispersant selected from terpolymers of ethylene, propylene, and dicyclopentadiene, copolymers of styrene and butadiene, and homopolymers of butadiene, whereby a dispersion of polymer particles in the diluent is produced having a particle size that is substantially smaller than polymer particles prepared in absence of the dispersant, which polymer particles, in the preferred embodiment, do not settle out almost immediately after stopping agitation and result in a much cleaner reactor than in slurry polymerization systems where dispersants are not used.

REFERENCES:
patent: 4039491 (1977-08-01), Ikeda et al.
patent: 4138448 (1979-02-01), Minchak

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