Method for sulfonating aromatic polyether sulfones

Details Method for sulfonating aromatic polyether sulfones Method for sulfonating aromatic polyether sulfones

1989-04-27

1991-05-07

Henderson, Christopher

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

Synthetic resins

Ion-exchange polymer or process of preparing

521 29, 525534, C08J 520, C08G 7523

Patent

active

050137654

ABSTRACT:
The sulfonation of aromatic polyether sulfones in a controllable manner is possible by means of sulfur trioxide in concentrated sulfuric acid as solvent. By maintaining a sulfur trioxide content of less than 6 percent by weight, based on the solvent, and a reaction temperature of less than 30.degree. C., side reactions and degradation reactions are to a large extent suppressed. The resultant products are suitable for preparation of membranes.

REFERENCES:
patent: 3709841 (1973-01-01), Quentin
patent: 4208508 (1980-06-01), Hashino
patent: 4508852 (1985-04-01), Bikson et al.
Patents Abstracts of Japan, C-278 Apr. 25, 1985; vol. 9/No. 96, Abstract 59-228017(A).
Japanese Abstract No. 58-091-822-A.

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