Abstract: The present invention provides a metallocene catalyst supported on a molecular seive having “tubules-within-a-tubule” morphology. When the metallocene catalyst is used for preparing polyolefin, the MAO amount can be decreased to an amount such that the molar ratio of Al/Zr is below 200. Thus, production costs are greatly reduced.

Abstract: The present invention provides an olefin/cycloolefin/alkylstyrene copolymer which is non-functionalized, functionalized, or grafted. By the functionalization of the benzylic protons of the alkylstyrene unit, the copolymer can be functionalized. The functionalized or grafted olefin/cycloolefin/alkylstyrene copolymer has good adhesion to a substrate and good compatibility with other polymers compared with the non-functionalized copolymer.

Abstract: The present invention provides a novel bimetallic metallocene with a high catalytic activity for preparing olefin polymers having a narrow MWD.

Abstract: A novel organometallic compound is disclosed which can be used, in conjunction with a trialkyl or bialkyl aluminum cocatalyst, for catalyzing the polymerization and copolymerization of ethylene without requiring the use of either methyl aluminoxane or borate as cocatalyst. The organometallic compound is represented by the formula of (C.sub.5 R.sub.n H.sub.5-n)(L)MX.sub.a Y.sub.b ; wherein: (a) C.sub.5 R.sub.n H.sub.5-n is a substituted or unsubstituted cyclopentadienyl group, in which n is an integer between 0 and 5, and R is C.sub.1 to C.sub.6 alkyl group; (b) L is tetrapyrazolyl borate, hydrotrispyrazolyl borate, dihydrobispyrazolyl borate or hydrotris(3,5-dimethylpyrazolyl) borate; (c) M is a Group IIIB, Grcup IVB, or Group VB transitional metal; (d) a and b are integers such that a+b=m-2, where m is the valance of M; and (e) X and Y, which can be the same of different from each other, are halogen atoms or ligands represented by the formula of ER.sup.1 or ER.sup.1 R.sup.

Abstract: A novel organometallic compound is disclosed which can be used, in conjunction with a trialkyl or bialkyl aluminum cocatalyst, for catalyzing the polymerization and copolymerization of ethylene without requiring the use of either methyl aluminoxane or borate as cocatalyst. The organometallic compound is represented by the formula of (CR.sub.5 R.sub.n H.sub.5-n)(L)MX.sub.a Y.sub.b ; wherein: (a) C.sub.5 R.sub.n H.sub.5-n is a substituted or unsubstituted cyclopentadienyl group, in which n is an integer between 0 and 5, and R is C.sub.1 to C.sub.6 alkyl group; (b) L is tetrapyrazolyl borate, hydrotrispyrazolyl borate, dihydrobispyrazolyl borate or hydrotris(3,5-dimethylpyrazolyl) borate; (c) M is a Group IIIB, Group IVB, or Group VB transitional metal; (d) a and b are integers such that a+b=m-2, where m is the valance of M; and (e) X and Y, which can be the same of different from each other, are halogen atoms or ligands represented by the formula of ER.sup.1, where E is a Group VA or VIA element, and R.sup.

Abstract: A novel organometallic compound is disclosed which can be used, in conjunction with a trialkyl or bialkyl aluminum cocatalyst, for catalyzing the polymerization and copolymerization of ethylene without requiring the use of either methyl aluminoxane or borate as cocatalyst. The organometallic compound is represented by the formula of (C.sub.5 R.sub.n H.sub.5-n)(L)MX.sub.a Y.sub.b ; wherein: (a) C.sub.5 R.sub.n H.sub.5-n is a substituted or unsubstituted cyclopentadienyl group, in which n is an integer between 0 and 5, and R is C.sub.1 to C.sub.6 alkyl group; (b) L is tetrapyrazolyl borate, hydrotrispyrazolyl borate, dihydrobispyrazolyl borate or hydrotris(3,5-dimethylpyrazolyl) borate; (c) M is a Group IIIB, Group IVB, or Group VB transitional metal; (d) a and b are integers such that a+b=m-2, where m is the valance of M; and (e) X and Y, which can be the same of different from each other, are halogen atoms or ligands represented by the formula of ER.sup.1, where E is a Group VA or VIA element, and R.sup.

Abstract: A catalyst composition is disclosed for catalyzing the polymerization and copolymerization reactions of ethylene monomers, with or without another olefin monomer. The catalyst composition comprises a metallocene compound represented by the the formula of (C.sub.5 R.sub.n H.sub.5-n)(L)MXY or the formula of (C.sub.5 R.sub.n H.sub.5-n)(L)MX.sup.+ A.sup.- ; wherein: (a) C.sub.5 R.sub.n H.sub.5-n is a substituted or unsubstituted cyclopendadienyl group; (b) L is tetrapyrazolyl borate, hydrotrispyrazolyl borate, dihydrotrispyrazolyl borate or hydrotris-3,5-dimethyl; (c) M is Group IIIB, Group IVB, or Group VB transitional metal; (d) X is a C.sub.1 to C.sub.4 alkyl or alkenyl group, an aromatic group, an alkylaryl, a halogen, a hydrogen, or a silane group; (e) Y, which can the same as or different from X, is a C.sub.1 to C.sub.4 alkyl or alkenyl group, an aromatic group, an alkylaryl, a halogen, a hydrogen, or a silane group; and (f) A.sup.- is non-coordinated or loosely coordinated bulky anion. Examples of the (C.