Polyamideimide resin composition and fluorine-containing coating material

A method for producing a polyamideimide resin composition which contains a polyamideimide resin (A), 4-morpholine carbaldehyde (B), water (C), and a basic compound (D), wherein a change in viscosity of the composition from before storage to after storage at 60° C. for 7 days is within −30%, comprising:

• a polymerization step of reacting a diisocyanate compound and a tribasic acid anhydride and/or tribasic acid halide in an organic solvent containing 4-morpholine carbaldehyde (B) to form a reaction solution containing the polyamideimide resin (A);
• a step of adding the basic compound (D) to the reaction solution;
• and
• a step of adding water (C) into the reaction solution containing the basic compound (D),
• wherein the polymerization step is performed by a two-stage heating process comprising a first heating at 70 to 100° C. and a second heating at 110 to 140° C.