Melt polymerization process for preparing aromatic polyesters
AssigneeThe Dow Chemical Company
InventorsRay E. Drumright, James Lee Brewbaker, William B. Marshall
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Abstract
A process for preparing a polyester which includes the step of heating a reaction mixture comprising (i) diesters of dihydric phenols and C.sub.1-10 aliphatic monoacids, (ii) aromatic dicarboxylic acids, and (iii) a catalytic amount of an organic cation-containing salt at a temperature above the melt temperature of the diesters, under reaction conditions sufficient to form the corresponding polyester. Use of this process subjects the polymers prepared thereby to a thermal history which causes relatively little deterioration of the polymer's properties.
Claims27
A process for preparing a polyester which includes the step of heating a reaction mixture comprising (i) diesters of dihydric phenols and C.sub.1-10 aliphatic monoacids, (ii) aromatic dicarboxylic acids, and (iii) a catalytic amount of an organic cation-containing salt at a temperature above the melt temperature of the diesters, under reaction conditions sufficient to form the corresponding polyester.
A process for preparing a polyester which includes the step of heating a reaction mixture comprising (i) diesters of dihydric phenols and C.sub.1-10 aliphatic monoacids, (ii) dicarboxylic acids, and (iii) a catalytic amount of an organic cation-containing salt, and optionally, (iv) compounds containing one carboxylic acid group and one aliphatic ester group derived from a phenolic group, under reaction conditions sufficient to form the corresponding polyester, wherein at least 20 mole percent of the combined molar amount of (ii) and (iv) are aromatic dicarboxylic acids.
Dependencies are inferred from the claim text.