Preparation of aromatic polyesters by direct self-condensation of aromatic hydroxy acids
AssigneeCelanese Corporation
InventorAnthony J. East
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Abstract
Provided is a method for preparing melt-processable polyesters efficiently via the direct polymerization of aromatic hydroxy acids. By the direct polymerization method, hydroxy and acid moieties are reacted directly without the use of acetylated reactants, thereby avoiding the disadvantages inherent in the case of acetylated reactants. The direct polymerization is conducted in the presence of a catalyst comprising a metal selected from the group consisting of the Group IV and V metals.
Claims11
A process for preparing a wholly aromatic polyester comprising reacting at least one hydroxynaphthoic acid employed in an amount ranging from about 10 to 90 mole percent and at least one hydroxybenzoic acid in an amount from about 10 to 90 mole percent in the presence of a catalytic amount of a metallic compound selected from the group consisting of a Group IV or V metal salt, oxide and organometallic derivative under polymerization reaction conditions.
Dependencies are inferred from the claim text.