To obtain a resin composition which gives give films excellent in surface touch and slipperiness by mixing a resin composition prepared by mixing a urethane resin having a specified number-average molecular weight with a polyimide in a specified ratio with an organic solvent in a specified ratio.
This composition is a coating composition containing 5-80 wt.% resin composition obtained by mixing 100 pts.wt. urethane resin having a number-average molecular weight of 5,000-300,000 with 90-400 pts.wt. polyimide and 95-20 wt.% organic solvent. The urethane resin solution is produced by reacting a diisocyanate with a polyol and a diol or a diamine in an equivalent ratio of 2/1/1 to 5/1/4 in a solvent such as dimethylformamide. The polyimide used is obtained by heating an aminodicarboxylic acid capable of a self- condensation cyclization reaction such as maleamic acid or aspartic acid and is exemplified by a polysuccinimide having a number-average molecular weight of 500 200,000. The coating composition is prepared by mixing the urethane solution with specified amounts of the polyimide, an isocyanate curing agent and various additives.
MUKAI SEIICHI
TOMITA MASAYUKI
NAKATO TAKESHI
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