Process for the continuous production of star-block copolymers o

Details Process for the continuous production of star-block copolymers o Process for the continuous production of star-block copolymers o

1983-04-06

1984-11-27

Briggs, Sr., Wilbert J.

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

Synthetic resins

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

525271, 525314, 422134, 422135, 422138, C08F29704

Patent

active

044852100

ABSTRACT:
A continuous process for producing star-block copolymer of a monovinyl aromatic monomer and a conjugated diene by continuously forming a vinyl aromatic polymer having a low weight average molecular weight to number average molecular weight ratio in a first reactor by anionic initiation in a solution of inert solvent; discharging a solution of polymer from the first reactor and passing the solution to a second sealed, cylindrical, pressurized, vertical reactor having a bottom zone, top zone and a plurality of intermediate zones separated by separation plates, each having a central aperture and mixing shaft passing therethrough, with the mixture passing to successive zones through an annular space formed between the shaft and each separation plate. The continuously produced solution of diblock copolymer is removed from the top zone of the second reactor and mixed with a polyfunctional coupling agent in a third reactor to produce a solution of star-block copolymer, with that solution discharged from the third reactor and contacted with a terminating agent, and the resultant star-block copolymer separated from the solvent.

REFERENCES:
patent: 3454675 (1969-07-01), Scoggin
patent: 4209599 (1980-07-01), Brady et al.
patent: 4346193 (1982-08-01), Warfel
patent: 4442273 (1984-04-01), Neiditch et al.

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