Process for the preparation of an olefin polymer using specific

Details Process for the preparation of an olefin polymer using specific Process for the preparation of an olefin polymer using specific

1995-06-07

1998-06-09

Nagumo, Mark

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526160, 526943, 526351, 526352, 526150, 556 11, 556 53, 502117, C08F 442

Patent

active

057635420

ABSTRACT:
A highly effective catalyst system for the polymerization of olefins comprises a cocatalyst, preferably an aluminoxane, and a metallocene of the formula I ##STR1## where M.sup.1 =Zr or Hf, R.sup.1 and R.sup.2 =(C.sub.1 -C.sub.3)-alkyl or chlorine, R.sup.3, with the proviso that at least one of the radicals R.sup.3 is not hydrogen, =hydrogen, F, Cl, --OR.sup.7, --NR.sup.7 R.sup.8, --P(O)R.sup.7 R.sup.8, --P(OR.sup.7).sub.2 or SR.sup.7, R.sup.4 is a ##STR2##

REFERENCES:
patent: 5145819 (1992-09-01), Winter et al.
patent: 5204419 (1993-04-01), Tsutsui et al.
patent: 5304614 (1994-04-01), Winter et al.
patent: 5329033 (1994-07-01), Spaleck et al.
J. March, Advanced Organic Chemistry, 4th Ed. Wiley, NewYork (1992) pp. 14-16.
Chemical Abstracts, vol. 117, 1992, Abstract No. 27208v.
Lee et al, "Organometallics", vol. 11, No. 6, pp. 2155-2122 (1992).
WPAT AN -90-355580/48, Abstract of EP359348 (Nov. 28, 1990).

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