PROBLEM TO BE SOLVED: To provide a method for producing a ketal bisphenol, which has a high reaction rate, a high conversion rate and an improved production efficiency.;SOLUTION: The method for producing a ketal bisphenol comprises reacting at least a dihydroxybenzophenone and a glycol or an alkylene dithiol. The reaction is carried out in the presence of 0.1-50 mol% of an organic sulfonic acid or an organic carboxylic acid based on the dihydroxybenzophenone.;COPYRIGHT: (C)2008,JPO&INPIT
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