Polymerization process employing metal halide catalyst and polym

Details Polymerization process employing metal halide catalyst and polym Polymerization process employing metal halide catalyst and polym

1993-05-06

1994-02-15

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

5263485, 526352, C08F 4646, C08F 1000

Patent

active

052868184

ABSTRACT:
A polymerization catalyst system is formed by producing a solution of a halide of scandium, yttrium, or a rare earth metal and an alcohol; contacting the solution with a halide ion exchanging source to form a solid. The catalyst thus produced can be combined with an organometallic cocatalyst. Polymers with multimodal molecular weight distribution are produced when a diol is used to prepare the catalyst and an organoaluminum halide is used as cocatalyst. Polymers with broad molecular weight distribution of the unimodal type are produced when using a trialkylaluminum compound or an alkyl aluminum hydride.

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"Study on the NdCl.sub.3 -supported Ziegler-Natta Catalyst for Olefin Polymerization" Xiao et al., Makromol. Chem. 192, 1059-1065 (1991).

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