Method for making a dicyclopentadiene thermoset polymer

Claim 1

A catalyst part of a metathesis-catalyst system comprising: a catalyst; a Lewis base or chelant; a phenolic compound; a solvent; an alkylaluminum activator; and a moderator, wherein the molar ratio of catalyst to Lewis base or chelant is about 1:5; wherein said catalyst is selected from the group consisting of tungsten hexahalide and tungsten oxyhalide; wherein said phenolic compound is selected from the group consisting of phenol, alkyl-phenols and halogenated phenols, where the phenolic compound is present in a molar ratio of tungsten compound to phenolic compound of from about 1:1 to about 1:3; wherein said solvent is selected from the group consisting of benzene, toluene, chlorobenzene, dichlorobenzene and trichlorobenzene; wherein the solvent is present in a sufficient amount so that the catalyst concentration is between about 0:1 and about 0.7 mole per liter of solvent; wherein said alkylaluminum activator is selected from the group consisting of trialkylaluminum, dialkylaluminum halides, and alkylaluminum dihalides; and wherein said moderator is selected from the group consisting of isopropyl ether, di-n-butyl ether, ethyl benzoate, phenylethyl acetate and diisopropyl ketone.