| abstract |
PROBLEM TO BE SOLVED: To provide a polyimide resin useful in the fields of various heat resistant coating materials and electrical insulating materials. SOLUTION: A polyisocyanate having an isocyanurate ring derived from a cycloaliphatic polyisocyanate and a polyol compound having a linear hydrocarbon structure, wherein the number average molecular weight of the linear hydrocarbon structure portion is 700 to 4, A polyimide resin obtained by reacting a prepolymer having an isocyanate group at the terminal obtained by reacting with 500 polyol compounds and an acid anhydride of a polycarboxylic acid having 3 or more carboxyl groups in an organic solvent, An acid value of 20 to 250, a linear hydrocarbon structure content of 20 to 40% by weight, an isocyanurate ring concentration of 0.3 to 1.2 mmol / g, and a number average molecular weight of 2,000 to 30 Polyimide resin having a weight average molecular weight of 3,000 to 100,000. [Selection figure] None |