| 摘要 |
PROBLEM TO BE SOLVED: To provide a plasticizer for polyester resins which can flexibilize an amorphous polyester resin without detriment to its transparency and to provide an amorphous polyester resin composition excellent in flexibility, transparency, and heat resistance. SOLUTION: The plasticizer contains an ester of the following components (a) with the following component (b). Component (a) is a hydroxyl-terminated polycarbonate diol containing repeating structural units [hereinbelow referred to as structural units (I)] represented by general formula (I) (wherein n is an integer of 2-6). Component (b) is at least one member selected from among an aromatic monocarboxylic acid represented by general formula (II) (wherein X is a hydrogen atom, a hydroxy group, a 1-22C straight chain or branched alkyl group, an alkenyl or alkoxy group, or a halogen atom; and m is an integer of 1-5, provided that mXs may be the same or different from each other), a fused polycyclic aromatic monocarboxylic acid, an alicyclic monocarboxylic acid, a hydroxy fused polycyclic aromatic monocarboxylic acid having at least one hydroxy group in the molecule, a hydroxy alicyclic monocarboxylic acid, and anhydrides or 1-3C lower alkyl esters of these carboxylic acids. COPYRIGHT: (C)2004,JPO
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