Process of making copolymers for viscosity index improvers

Details Process of making copolymers for viscosity index improvers Process of making copolymers for viscosity index improvers

1991-08-02

1992-08-04

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526282, 526305, 5263488, C08F 406, C08F22060, C08F21002

Patent

active

051359960

ABSTRACT:
A method of making a VI improver is disclosed. The one-step method of this invention includes reacting ethylene, an olefin other than ethylene and N-phenylphenylene methacrylamide in the presence of a cocatalyst system including a combination of a first group and a second group, said first group consisting of triethylaluminum, ethylaluminum, sesquichloride, diethylaluminum chloride, diethylzinc, ethylzinc chloride, triisobutylaluminum and mixtures thereof, and said second group consisting of titanium trichloride, titanium tetrachloride, vanadium tetrachloride, vanadium oxychloride, tetrabutyl titanate and mixtures thereof.

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