Semi-continuous process for making star-block copolymers

Details Semi-continuous process for making star-block copolymers Semi-continuous process for making star-block copolymers

1982-02-24

1983-06-28

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, C08F29704

Patent

active

043906630

ABSTRACT:
A semi-continuous process for the preparation of star-block copolymers of 60 to 90% by weight of monovinyl aromatic compound and 10 to 40% by weight of conjugated diene monomer has been developed. The process reduces the time needed to produce the copolymer by shortening reaction time and eliminating the need for costly cleanout between runs. Novel star-block copolymers are prepared which have bimodal arm structures containing a series of tapered copolymer segments.

REFERENCES:
patent: 4086298 (1978-04-01), Fahrbach
patent: 4180530 (1979-12-01), Bi

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