Process for sulfonating polymers

Details Process for sulfonating polymers Process for sulfonating polymers

1977-01-31

1978-08-08

Henderson, Jr., Christopher A.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

528500, 528486, 526 40, 526 84, 526 19, C08F 836

Patent

active

041056477

ABSTRACT:
A process for sulfonating polymers which are prepared by solution polymerization using a Friedel-Crafts or Ziegler-type catalyst is disclosed. The reactor effluent containing polymer, unreacted light monomers, diluent-solvent and active catalyst is first treated to remove substantially all unreacted light monomer, e.g. by flashing. The effluent is then treated with a sulfonating agent (e.g. acetyl sulfate and acetic acid) which simultaneously deactivates catalyst. Thereafter, the sulfonated polymer is neutralized, e.g. by exposure to metal salts, organic amines, etc., and subjected to normal finishing operations, e.g. deashing, steam stripping, stabilizing and drying.

REFERENCES:
patent: 2910461 (1959-10-01), Nowlin
patent: 3033834 (1962-05-01), Roth
patent: 3269997 (1966-08-01), Lyons
patent: 3396136 (1968-08-01), Dickerson
patent: 3642728 (1972-02-01), Canter

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