| abstract |
An olefin polymerization catalyst comprising:n (A) a solid titanium catalyst component comprisingnmagnesium, titanium, halogen and either a polycarboxylic acidnester or a polyether, (B) an organoaluminum compound, and (C) an organosilane compound of formula (1):n nwherein n is 1 or 2; the groups R a are the same or differentnand each is methyl or ethyl; R 1 , R 2 , R 3 and R 4 are the same orndifferent and each is hydrogen, halogen, alkyl, cycloalkyl,naryl, or aralkyl; and one of R 1 and R 2 together with one ofnR 3 and R 4 may form a ring together with the carbons to whichnthey are bonded. |