Process for sulfonating of polymers containing dicarboxylic acid cyclic imide units
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United States of America Patent
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Feb 17, 1987
Issued Date -
N/A
app pub date -
Dec 3, 1984
filing date -
Oct 31, 1983
priority date (Note) -
Expired
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Abstract
A process for producing sulfonated polymers containing styrene moieties and cyclic imide moieties comprises reacting a styrene/maleic anhydride copolymer with a primary amine to produce a polyimide and then subjecting the polyimide to sulfonation wherein both the imidization step and the sulfonation step are conducted in a solvent inert to both reaction steps, such as nitrobenzene.
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