Process for the preparation of polymers based on conjugated dien

Details Process for the preparation of polymers based on conjugated dien Process for the preparation of polymers based on conjugated dien

1990-02-20

1991-04-16

Bleutge, John C.

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

Synthetic resins

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

526181, 526173, 526209, 524571, 428515, C08F25502, C08F25506, C08K 306, B32B 2708

Patent

active

050083430

ABSTRACT:
A block-free polymer is prepared by anionically polymerizing at least two compounds selected from the groups consisting of butadiene, isoprene and styrene in an inert organic solvent in the presence of an organolithium compound as a catalyst and a cocatalyst of a glycol dialkyl ether: ##STR1## wherein R.sub.3 is hydrogen, methyl or ethyl, R.sub.1 and R.sub.2 are alkyl groups of different numbers of carbon atoms selected from the group consisting of methyl, ethyl, n-propyl, isopropyl, n-butyl, iso-butyl, sec-butyl and t-butyl, and the total number of carbon atoms in the alkyl group ranges from 5 to 7.

REFERENCES:
patent: 4530985 (1985-07-01), Broekhuis
patent: 4577002 (1986-03-01), Broekhuis

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