Polymerization of conjugated dienes

Details Polymerization of conjugated dienes Polymerization of conjugated dienes

1983-03-31

1986-10-28

Michl, Paul R.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526114, 502102, C08F 452

Patent

active

046199829

ABSTRACT:
The invention relates to a catalyst system comprising (a) a compound of a rare earth element and, as cocatalyst, a second component (b) comprising an organomagnesium compound. In the polymerization of a conjugated diene this catalyst gives a polymer having a very high content of trans 1,4 isomer. A third component (c) which is a Lewis acid alters the reaction to give a polymer having a very high content of cis 1,4 isomer. If desired reaction can be initiated using components (a) and (b) alone and component (c) then added at the desired conversion to produce a block polymer having a block of high trans content followed by a block of high cis content.

REFERENCES:
patent: 2921060 (1960-01-01), Stuart
patent: 2953531 (1960-09-01), Anderson et al.
patent: 3118864 (1964-01-01), Robinson et al.
patent: 3151104 (1964-09-01), Robinson
patent: 3489823 (1970-12-01), Naarmann
patent: 3644585 (1972-02-01), Takayanagi

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