| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a new tetracarboxylic acid containing a phosphorus-containing ester group participating in flame retardancy and high thermal diffusion property or its dianhydride, a phosphorus-containing polyester imide precursor produced by using the tetracarboxylic acid, and a phosphorus-containing polyester imide. Ž<P>SOLUTION: Provided are tetracarboxylic acids containing phosphorus-containing ester group expressed by formula (1) or formula (2) or its dianhydride, a phosphorus-containing polyester imide precursor produced by using the tetracarboxylic acid, and a phosphorus-containing polyester imide. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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