Patent ID: 6288254
Filing Date: 2001-09-11
Classification: B01J,C07F,Y10S

Abstract:
A bimetallic metallocene which is represented by the following formula: ##STR16##wherein:M is zirconium, hafnium, or titanium;R.sup.1 can be the same or different and is independently an alkyl, alkenyl, aryl, alkylaryl or arylalkyl group having from 1 to 20 carbon atoms or two adjacent R.sup.1 are joined together to form with the carbon atoms to which they are attached a ring system having from 4 to 20 carbon atoms;R.sup.2 is ##STR17##wherein Y can be the same or different and is carbon or silicon or can be deleted, each R.sup.21 can be the same or different and is hydrogen, an alkyl, aryl, alkylaryl or arylalkyl group having from 1 to 15 carbon atoms or is deleted when Y is deleted, R.sup.22 is a linear, branched or cyclic alkylene having from 1 to 15 carbon atoms;R.sup.3 is selected from the group consisting of ##STR18##wherein R.sup.31 and R.sup.32 can be the same or different and are independently hydrogen, a linear, branched, or cyclic alkyl, aryl, alkylaryl or arylalkyl group having from 1 to 15 carbon atoms, R.sup.33 is an unsubstituted or substituted alkanediyl group having from 2 to 15 carbon atoms wherein the alkanediyl group forms a ring system with the silicon or carbon atom to which it is attached, the substituent being selected from the group consisting of C.sub.1-20 alkyl, C.sub.1-20 alkenyl, C.sub.6-20 aryl, C.sub.7-20 alkylaryl, and C.sub.7-20 arylalkyl;R.sup.4 can be the same or different and isAR.sup.41, A(R.sup.42).sub.2, or ##STR19##wherein A is nitrogen, phosphorus, or arsenic, R.sup.41 and R.sup.42 can be the same or different and is independently hydrogen, a linear, branched or cyclic hydrocarbyl group having from 1 to 20 carbon atoms, R.sup.1 is defined as above, and z, which denotes the degree of substitution of the cyclopentadienyl ring, is from 0 to 5;L is independently an anionic ligand with a -1 valence;x is 0 or 1;y, which denotes the degree of substitution of the cyclopentadienyl ring, is from 0 to 4; and ##STR20##when both R.sup.4 arex=1 and at least one R.sup.3 is ##STR21##wherein R.sup.33 is defined as above;when x=1, R.sup.4 is selected from the group consisting of AR.sup.41, A(R.sup.42).sub.2, and ##STR22##when x=0, at least one R.sup.4 is AR.sup.41.