Patent ID: 6878658

Claim:
A catalyst consisting of a mixture of: (i) a magnesium compound of the formula (R 2 ) 2 Mg wherein R 2 is a C 1-6 alkyl radical; (ii) an alkyl aluminum compound of the formula (R 1 ) 3−a Al 1 (OR 5 ) a and, wherein R 1 and R 5 are independently selected from the group consisting of C 1-4 alkyl radicals and a is 0 or 1; (iii) a silicon containing compound of the formula: wherein each A is independently selected from the group consisting of C 1-10 alkyl radicals; C 1-10 alkoxide radicals; C 6-12 aryl radicals; C 6-12 aryl oxide radicals; and a hydroxy radical, B is selected from the group consisting of divalent C 1-4 alkyl radicals and divalent C 6-12 aryl radicals which is unsubstituted or up to fully substituted by one or more C 1-4 alkyl radicals, D is selected from the group consisting of a hydrogen atom, C 1-10 alkyl radicals; C 1-10 alkoxide radicals; C 6-12 aryl radicals; C 6-12 aryl oxide radicals; an amine radical or the formula NR 9 R 10 where R 9 and R 10 are independently selected from the group consisting of a hydrogen atom; a hydroxyl radical; a C 1-4 alkyl radical; a radical of the formula SO 2 CF 3 ; radical of the formula SO 2 C 6 F 5 ; a radical of the formula S—R 9 is as defined above; a radical of the formula OSO 2 R 11 wherein R 11 is selected from the group consisting of C 1-10 alkyl radicals, and C 6-12 aryl radicals, a hydrogen atom; or a group 1, 2 or 3 metal, each R 8 is selected from the group consisting of a hydrogen atom, a C 1-4 alkyl radical, a C 1-4 alkoxide radical, a C 6-12 aryl radical; a C 6-12 aryl oxide radical; w is an integer from 1 to 3, x is 0 or 1, and y is 0 or 1, provided the silicon compound contains a functional group or atom which reacts with the above aluminum compound; (iv) a halide of the formula R 3 X, wherein R 3 is a C 1-4 alkyl radical and x is a halide selected from the group consisting of chlorine and bromine; (v) titanium tetrachloride, to provide a molar ratio of Mg to Al 1 from 4.0:1 to 6:1; Mg:Ti from 4 to 6; a molar ratio of Al 1 to Ti from 0.5:1 to 3:1; a molar ratio of halide to Mg from 1.8:1 to 2.4:1; a molar ratio of Si:Ti from 0.5:1 to 3:1 and a molar ratio of Al 1 :Si from 0.5:1 to 3:1; and (vi) optionally an alkyl aluminum compound of the formula (R 4 ) 3−b Al 2 (OR 7 ) b , wherein R 4 and R 7 are independently selected from the group consisting of C 1-4 alkyl radicals and b is 1 or 0 to provide: a molar ratio of Al 2 to Ti from 0:1 to 5:1.