| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a naphthol resin having slightly-changed heat resistance after subjected to a thermal history and exhibiting low thermal expandability, and further realizing excellent solvent solubility. <P>SOLUTION: The naphthol resin contains 15-35% of a trimer, which is a polycondensate of an α-naphthol compound, a β-naphthol compound and formaldehyde and is shown by formula (1) (wherein R<SP POS="POST">1</SP>and R<SP POS="POST">2</SP>are each a hydrogen atom, a 1C-4C hydrocarbon group or a 1C-4C alkoxy group independently), and 1-25% of a dimer of the polycondensate. <P>COPYRIGHT: (C)2013,JPO&INPIT |
