POLYIMIDE AND OPTICAL PART USING THE SAME

PROBLEM TO BE SOLVED: To obtain a polyimide that has a small optical birefringence and is useful as an optical transmission material for optical parts by using a specific diamine as a part or the whole part of the diamine component. SOLUTION: This polyimide is obtained by allowing (A) a tetra-carbox...

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Bibliographic Details
Main Author YAMAGISHI TOMOAKI
Format Patent
LanguageEnglish
Published 26.03.1999
Edition6
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
ORGANIC MACROMOLECULAR COMPOUNDS
PHYSICS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Summary:PROBLEM TO BE SOLVED: To obtain a polyimide that has a small optical birefringence and is useful as an optical transmission material for optical parts by using a specific diamine as a part or the whole part of the diamine component. SOLUTION: This polyimide is obtained by allowing (A) a tetra-carboxylic dianhydride to react with (B) a part or the whole of a diamine (preferably 3-100% to the mole equivalent of the whole diamines) of the formula (R1 -R4 are each H, F, CF3 , CHF2 and OCF2 where at least one is F or CF,) in a polar solvent as N-methyl-2 pyrrolidone or N,N-dimethylacetamide to form a polyimide precursor and imidizing the precursor by heating it at 80-50 deg.C for 30 minutes to 10 hours. As a diamine of the formula, 3,5-diaminobenzaotrifluoride is preferably used from the view points of the reactivity on the polyimide synthesis and of the reduction in optical birefringence of the polyimide formed.
Bibliography:Application Number: JP19970249213