Method of sulfonation of block polymers

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United States of America Patent

PATENT NO 8835562
APP PUB NO 20100048817A1
SERIAL NO

12498778

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Abstract

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Improved methods for preparing sulfonated block polymers with acyl sulfates in non-halogenated aliphatic solvents are provided. The methods include the sulfonation of a precursor block polymer with an acyl sulfate in a reaction mixture further comprising at least one non-halogenated aliphatic solvent to form a sulfonated block polymer, wherein the initial concentration of the precursor block polymer is in the range of from about 0.1 wt % to a concentration that is below the limiting concentration of the precursor block polymer based on the total weight of the reaction mixture. A sulfonation degree of greater than about 1.0 milliequivalent sulfonic acid per gram sulfonated block polymer can be achieved substantially free of polymer precipitation and free of disabling gelation.

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Patent Owner(s)

Patent OwnerAddress
STEPAN COMPANY22 W FRONTAGE ROAD NORTHFIELD IL 60093

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Dado, Gregory Paul Chicago, US 8 82
Handlin,, Jr Dale Lee Houston, US 19 224
Willis, Carl Lesley Houston, US 36 554

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