Abstract: A metathesis catalyst activator composition consisting essentially of an alkoxyalkylaluminum halide and a tin compound in a molar ratio of about 0.15 to 2 moles of the alkoxyalkylaluminum halide per mole of tin compound.

Abstract: Disclosed is a method of moderating the catalyst activation characteristics of an alkyl aluminum compound by the use of hydrocarbon substituted acetylene. Preferred compounds are phenylacetylene, hexyne-1-and hexyne-2.

Abstract: A metathesis catalyst activator composition consisting essentially of an alkoxyalkylaluminum halide and a tin compound in a molar ratio of about 0.15 to 2 moles of the alkoxyalkylaluminum halide per mole of tin compound.

Abstract: A metathesis polymerization catalyst composition comprising a binuclear catalyst, wherein said binuclear catalyst is a mixture of at least two transition metal components, wherein a first transition metal component is a halide complex of tungsten, an oxyhalide complex of tungsten or a mixture thereof and a second transition metal component is a halide complex of a transition metal selected from the group consisting of high valent transition metals belonging to Groups IV or V of the Periodic Table, from about 1 to about 3 moles of phenolic compound per mole of tungsten component, activated by a metathesis catalyst activator and containing a rate moderator.

Abstract: The invention relates to a catalyst composition for polymerization of norbornene-type monomer: including WCl.sub.4 O and WCl.sub.6 in a molar ratio of WCl.sub.4 O to WCl.sub.6 from 1:9 to 1:1 (i.e., 10-50% WOCl.sub.4 and 90-50% WCl.sub.6). The method of making catalyst includes: providing catalyst precursor material, the major portion of which is WCl.sub.6, and contacting controlled proportions of the oxygen donor and WCl.sub.6 to form WCl.sub.4 O in a molar ratio to WCl.sub.6 of between 1:9 and 1:1.