Catalysts and processes for the polymerization of olefins

Details Catalysts and processes for the polymerization of olefins Catalysts and processes for the polymerization of olefins

1998-10-21

2000-10-24

Wu, David W.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526943, 526127, 502117, 502152, 502155, 502111, C08F 4602

Patent

active

061369322

ABSTRACT:
Catalysts for the polymerization of olefins which comprise the reaction product of (a) a bridged and/or substituted cyclopentadienyl compound of titanium, zirconium, or hafnium; (b) an organometallic aluminum compound of formula Al(CH.sub.2 --CR.sup.4 R.sup.5 R.sup.6).sub.w R.sup.7.sub.y H.sub.z, wherein in the (CH.sub.2 --CR.sup.4 R.sup.5 R.sup.6) groups, which are the same or different, R.sup.4 is an alkyl, alkenyl or arylalkyl group having from 1 to 10 carbon atoms, R.sup.5 is an alkyl, alkenyl, aryl, arylalkyl or alkylaryl group having from 3 to 50 carbon atoms and, optionally, R.sup.4 and R.sup.5 can be fused together to form a ring having from 4-6 carbon atoms, R.sup.6 is hydrogen or an alkyl alkenyl or arylalkyl group having from 1 to 10 carbon atoms, the R.sup.7 substituents, the same or different, are alkyl, alkenyl, aryl, arylalkyl or alkylaryl radicals having from 1 to 10 carbon atoms and, optionally, can contain Si or Ge atoms, w is 1, 2 or 3, z is 0 or 1, and y=3-w-z; and (c) water. The molar ratio of aluminum to water is from 1:1 to 100:1. The catalysts show an improved activity with respect to known catalysts wherein an aluminum compound different from those of the invention are used.

REFERENCES:
patent: 5008228 (1991-04-01), Chang
patent: 5321107 (1994-06-01), Tsutsui et al.
L. Resconi et al. "Olefin Polymerization at Bis(pentamethylcyclopentadienyl)zirconiumand -hafnium Centers: Chain-Transfer Mechanisms", J. Am. Chem. Soc. 1992, 114, pp. 1025-1032.
Von Karl Ziegler et al. "Aluminiumtrialkyle und Dialkyl-Aluminiumhydride aus Aluminiumisobutyl-Verbindungen", Liebigs Ann. Chem., vol. 629, pp. 14-19, Mar. 29, 1960.
Patent Abstracts of Japan, unexamined applications, C Field, vol. 9, No. 287, p. 28C 314, Nov. 14, 1985.
Patent Abstracts of Japan, unexamined applications, C Field, vol. 10, No. 136, p. 90 C 347, May 20, 1986.

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