Process for producing a composition for aqueous coating material

摘要

The present invention relates to a process for producing a composition for aqueous coating material, which comprises:
an esterification step of reacting a fluorinated copolymer (B) comprising from 40 to 60 mol% of a fluoroolefin unit, from 3 to 50 mol% of an alkyl vinyl ether or alkyl vinyl ester unit and from 4.4 to 37 mol% of a hydroxyl group-containing vinyl ether unit (provided that the total mol% value of the respective structural units of the formulae (a1), (a2) and (a3) is from 80 to 100) with a dibasic acid anhydride in an organic solvent to esterify a part of the hydroxyl group in the hydroxyl group-containing vinyl ether unit to introduce a carboxyl group;
a neutralizing step of adding a basic compound to neutralize at least a part of the carboxyl group with the basic compound;
a step of adding water; and
a step of removing the organic solvent.