Patent ID: 7662902
Filing Date: 2010-02-16
Classification: C08G,C09J

Abstract:
1. A method for producing a phenolic resin, comprising: (a) reacting bisphenols with aldehydes in the presence of alkaline catalysts at a temperature of from 0 to 100° C. to obtain a reactive resin; (b) neutralizing the reactive resin prepared from (a) by using acids, followed by the addition of phenols, then adding acids to adjust the pH value of the reaction mixture to a range of from 0 to 6, subsequently, heating to a temperature of from 50 to 200° C. and then vacuumed to recover a phenolic resin having not more than 5 wt % of free bisphenol and a molecular weight distribution represented by Mw/Mn of not more than 2.0.