Organometallic catalysts containing hydrotris(pyrazolyl) borate

Details Organometallic catalysts containing hydrotris(pyrazolyl) borate Organometallic catalysts containing hydrotris(pyrazolyl) borate

1995-06-07

1996-05-21

Nagumo, Mark

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526134, 526352, 5263482, 502103, 502117, 502132, 556 8, C08F 4642

Patent

active

055190995

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.sub.5 R.sub.n H.sub.5-n)(L)MXY and (C.sub.5 R.sub.n H.sub.5-n)(L)MX.sup.+ A.sup.- metallocene compounds are represented by the following formulas: ##STR1## respectively.

REFERENCES:
patent: 4870042 (1989-09-01), Kohara et al.
patent: 5237069 (1993-08-01), Newman
patent: 5312794 (1994-05-01), Kelsey
H. Yasuda and H. Tamai (1993) Progr. Polym. Sci, 18, 1139, pp. 1118-1123 (excerpt).

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