| 摘要 |
<p>A norbornene-type monomer is copolymerlzed with about 0% to about 95% by weight or dicyclopentadiene, based upon total polymer weight. The polymerization is conducted in the presence of (1) a catalyst comprising (a) at least one compound selected from the group consisting or dialkylaluminum iodides, alkylaluminum diodies and mixtures of trialkylaluminum compounds with iodine, (b) at least one dialkylaluminum chloride or alkylaluminum dichloride and (c) at least one monomer- or solvent-soluble tungsten compound, and (2) at least one nonconjugated acyclic olefin having at least one hydrogen on each double-bonded carbon atom. Catalyst components (a) and (b) are charged before catalyst component (c). Use of a catalyst containing components (a), (b) and (c) produces easy-processing and substantially gel-free polymers, whereas a catalyst containing only (a) and (c) or only (b) and (c) produces heavily gelled polymers.</p> |
