Method for producing branched aromatic polyesters

Abstract

In a method for producing aromatic polyesters having improved moldability by the polycondensation of A: one or more compounds selected from the group consisting of aromatic hydroxycarboxylic acids and their functional derivatives such as acylated or esterified compounds thereof, or A with B: one or more compounds selected from the group consisting of aromatic dicarboxylic acids and their functional derivatives such as esterified compounds or acid halides thereof and C: one or more compounds selected from the group consisting of aromatic diphenols and their functional derivatives such as acylated compounds thereof, the improvement comprising adding to the reaction system, either in bulk, or gradually during polycondensation D: one or more compounds selected from the group consisting of 1,3,5-trihydroxybenzene, 3,5-dihydroxybenzoic acid, 5-hydroxyisophthalic acid and their functional derivatives such as acylated or esterified compounds thereof, whereby D is included in the reaction.

Dependencies are inferred from the claim text.