| abstract |
PURPOSE: To obtain the titled precursor having excellent heat-resistance and adhesivity, etc., and capable of giving an LB membrane suitable as an insulation film for IC, clad material for waveguide, etc., by reacting a tetracarboxylic acid dianhydride with an alcohol and reacting the product with a diamine. n CONSTITUTION: The objective precursor of formula III can be produced by reacting (A) a tetracarboxylic acid dianhydride of formula I (R 1 is ≥2C tetra-valent group) (e.g. pyromellitic dianhydride) with (B) a compound of formula R 3 OH and R 4 OH (R 3 and R 4 are 1W30C aliphatic group, etc.) and reacting the reaction product with (C) a compound of formula II (R 2 is ≥2C bivalent group; R 5 and R 6 are 1W30C univalent aliphatic group, etc.) in a polar organic solvent (e.g. N,N-dimethylacetamide) at -10W+50°C. An LB membrane is obtained by spreading the precursor on a water surface and transferring the formed monomolecular film to a surface of a substrate. A thin film can be produced by imidating the LB membrane e.g. at 300W400°C. n COPYRIGHT: (C)1988,JPO&Japio |