Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1996-02-15
1997-11-04
Wu, David W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526134, 526160, 526161, 526352, 526943, 502155, 502117, C08F 464
Patent
active
056840985
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.1 is C.sub.1 to C.sub.6 alkyl group, aryl group or halogen-substituted aryl group. Preferably, M is a Group IVB transitional metal and a=b=1, and the organometallic compound is then represented by the formula of (C.sub.5 R.sub.n H.sub.5-n)(L)MXY.
REFERENCES:
patent: 4871705 (1989-10-01), Hoel
patent: 5237069 (1993-08-01), Newman
patent: 5258475 (1993-11-01), Kissin
patent: 5324800 (1994-06-01), Welborn et al.
patent: 5519099 (1996-05-01), Wang et al.
Chan Shu-Hua
Chen Yi-Chun
Ting Ching
Tsai Jing-Cheing
Wang Shian-Jy
Industrial Technology Research Institute
Liauh W. Wayne
Wu David W.
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