Patent ID: 6686491
Filing Date: 2004-02-03
Classification: C08F

Abstract:
A complex of formula I: 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.