Polymerization of conjugated dienes

Details Polymerization of conjugated dienes Polymerization of conjugated dienes

1986-08-04

1987-08-25

Michl, Paul R.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525314, 526127, 526128, 526151, 526164, C08F29500

Patent

active

046893687

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
patent: 3118864 (1964-01-01), Robinson et al.
patent: 3151104 (1964-09-01), Robinson
patent: 4242232 (1980-12-01), Sylvester
patent: 4429089 (1984-01-01), Pedretti
patent: 4520177 (1985-05-01), Jenkins

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