Sulfonated polyimides and polyamic acids and method for their pr

Details Sulfonated polyimides and polyamic acids and method for their pr Sulfonated polyimides and polyamic acids and method for their pr

1984-12-17

1986-03-04

Lee, Lester L.

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

Synthetic resins

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

525434, 525436, C08L 7712

Patent

active

045741441

ABSTRACT:
Sulfonated polyimides and polyamic acids, particularly polyetherimides, are prepared by reacting the unsulfonated polymer with a mild sulfonating agent. Illustrative sulfonating agents are the complexes of sulfur trioxide and trialkyl or triaryl phosphates, especially the sulfur trioxide-triethyl phosphate complex having a molar ratio of sulfur trioxide to triethyl phosphate of 2:1.

REFERENCES:
patent: 4017555 (1977-04-01), Alvarez
Gilbert, Sulfonation and Related Reactions (New York: Interscience Publishers, 1965), 15-16.
Noshay et al., J. Appl. Polymer Sci., 20, 1885-1903, (1976).

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