Process for the preparation of block copolymers

Details Process for the preparation of block copolymers Process for the preparation of block copolymers

1977-03-09

1980-08-26

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...

C08f29704

Patent

active

042196272

ABSTRACT:
The process described herein involves the preparation of block copolymers of the S-B-S type wherein S represents a block of polystyrene and B represents a block of polybutadiene. In order to have the initial polystyrene block soluble in the polymerization medium, cyclohexane and aromatic hydrocarbons have been used as the diluent or solvent in these polymerizations. The present process permits the use of hexane as diluent by having dissolved therein prior to polymerization a small amount of the S-B-S type of block copolymer being produced in the polymerization. Advantageously this solution used as the polymerization medium is prepared merely by washing the reactor used in a previous polymerization for production of the same type of S-B-S block copolymer with hexane to dissolve solid residues of S-B-S block copolymer deposited on the wall or agitator of the reactor. This hexane solution is then retained in the reactor to serve as the medium for the next polymerization batch. The dissolved S-B-S copolymer serves as a suspension agent for dispersion of the initial polystyrene block.

REFERENCES:
patent: 3231635 (1966-01-01), Holden
patent: 3265765 (1966-08-01), Holden
patent: 3402160 (1968-09-01), Hayes
patent: 3427364 (1969-02-01), Shaw
patent: 3956419 (1976-05-01), Murray
patent: 3957914 (1976-05-01), Baumgartner
patent: 3972963 (1976-08-01), Schwab

Affiliated with

Also associated with

Rating

Process for the preparation of block copolymers does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the preparation of block copolymers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of block copolymers will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1306125