Molecular weight modifier for use with lanthanide and actinide c

Details Molecular weight modifier for use with lanthanide and actinide c Molecular weight modifier for use with lanthanide and actinide c

1986-04-16

1987-05-05

Michl, Paul R.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526164, C08F 472

Patent

active

046634053

ABSTRACT:
Lanthanide and actinide catalyst systems normally appear to be "pseudo-living" when they are used to polymerize conjugated diolefin monomers into polymers. Polymerizations which are catalyzed with such catalyst systems produce polymers which have increasingly high molecular weight as monomer conversions are increased. Consequently, any change in polymerization time or conversion may affect the polymer's ultimate molecular weight. This has made controlling the molecular weight of polymers which are made utilizing lanthanide and actinide catalysts difficult.
It has been unexpectedly discovered that vinyl halides can be used as molecular weight regulators for polymerizations which are catalyzed with lanthanide and actinide catalyst systems. Accordingly, the present invention relates to a process which comprises polymerizing at least one conjugated diolefin monomer in the presence of (a) a catalyst system which is comprised of (1) an organoaluminum compound, (2) an organometallic compound which contains a metal from Group III-B of the Periodic System, and (3) at least one compound which contains at least one labile halide ion; and (b) a vinyl halide.

REFERENCES:
patent: 3846388 (1974-11-01), Ohashi
patent: 4145497 (1979-03-01), Sylvester
patent: 4242232 (1980-12-01), Sylvester
patent: 4533711 (1985-08-01), Takeuchi

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