| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyimide for a new optical material, which comprises a polyimide material, the material being excellent in heat resistance, chemical resistance, water repellency, dielectric characteristics, electrical characteristics and optical characteristics, causing a small loss as an optical transmission material, and showing a small birefringence. SOLUTION: The polyimide for the new optical material comprises, as a constituent unit, a structure represented by formula (1) (wherein X<SP>1</SP>, X<SP>2</SP>, X<SP>3</SP>, and X<SP>4</SP>are each independently a hydrogen atom or a fluorine atom). COPYRIGHT: (C)2005,JPO&NCIPI
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