Patent ID: 6444834
Filing Date: 2002-09-03
Classification: C08F

Abstract:
A process for polymerizing one or more C2-8 olefins at a temperature from 20Â° C. to 120Â° C. and at a pressure from 15 to 4500 psig in the presence of a complex of the formula: wherein each R1 is independently selected from the group consisting of a C1-8 straight or branched alkyl radical, a C6-12 cyclic aliphatic or aromatic radical and a radical of the formula Si(R6)3 wherein each R6 is independently selected from the group consisting of C1-8 alkyl and alkoxy radicals; R2 is selected from the group consisting of C1-8 straight chained, branched or cyclic aliphatic radicals and C6-12 cyclic aliphatic and aromatic radicals; c is 0 or 1; each R3 is independently selected from the group consisting of C1-8 alkyl radicals and C6-12 aromatic radicals which are unsubstituted or substituted by one or more substituents selected from the group consisting of halogen atoms and C1-4 alkyl radicals; each R4 is independently selected from the group consisting of C1-8 alkyl radicals, X is a halogen atom and b is 1 or 2; R5 is selected from the group consisting of C1-8 straight chained, branched or cyclic aliphatic radicals and C6-12 cyclic aliphatic and aromatic radicals; Y is a heteroatom selected from the group consisting of an oxygen atom, a nitrogen atom and a sulfur atom and a is an integer so that the valence state of Yâˆ’2=a; andan activator selected from the group consisting of:(i) aluminoxane compounds R202AlO(R20AlO)mAlR202 wherein each R20 is independently selected from the group consisting of C1-20 hydrocarbyl radical and m is from 5 to 30 to provide a molar ratio of aluminum in the activator to aluminum in the complex from 20:1 to 1000:1; (ii) anions of the formula [B(R18)4]âˆ’ wherein each R18 is independently selected from the group consisting of phenyl radicals which are unsubstituted or substituted by up to 5 substituents selected from the group consisting of a fluorine atom, a C1-4 alkyl or alkoxy radical which is unsubstituted or substituted by a fluorine atom and a silyl radical of the formula â€”Si(R19)3; wherein each R19 is independently selected from the group consisting of a hydrogen atom and a C1-4 alkyl radical; and an activator of the formula [B(R18)3] wherein R18 is as defined above, to provide a molar ratio of B:Al from 0.4 to 1.2; and (iii) a mixture of (i) and (ii) above.