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US 4,357,449 AGranted
Dispersion polymerization of cycloolefins
AssigneeThe B. F. Goodrich Company
InventorKong S. Yi
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AssigneeThe B. F. Goodrich Company
InventorKong S. Yi
Estimating the term…
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.
Process for polymerizing by ring opening polymerization at least one monomer selected from monomers containing the norbornene group shown below, ##STR4## said process comprising reacting said monomer(s) in the presence of a hydrocarbon diluent, a catalyst system, and a sufficient amount of a dispersant to produce a particulate polymer product comprising polymer particles dispersed in said diluent, said polymer particles being of a size that are much smaller than polymer particles prepared in absence of said dispersant, said diluent being a solvent for said monomer(s) but a nonsolvent for said polymer particles, and said dispersant being selected from unsaturated elastomers that are soluble in said diluent and have a double bond along the backbone chain or in a pendant group thereof.
Dependencies are inferred from the claim text.