Patent ID: 7192994

Claim:
A method of producing a powdery coating material by using: a curable polyester resin (A) having a hydroxyl group and/or a carboxyl group at the terminals thereof, and further having a number average molecular weight of from 1,000 to 30,000, a glass transition temperature of from 30 to 100° C.; a curing agent (B) which is solid at normal temperature and is capable of being reacted with the hydroxyl group or the carboxyl group of the curable polyester resin (A); and a solvent (C) having a boiling point under normal pressure of from 50 to 130° C.; said method comprising a step of kneading the curable polyester resin (A), the curing agent (B) and the solvent (C) under a temperature condition of from 50 to 130° C. so that not less than 33% by weight of the curing agent (B) is dissolved in the solvent (C) wherein the concentration of the solvent (C) in the kneading step is 1.5 to 20% by weight, then, vapor-removing the solvent (C) under a reduced pressure wherein the powdery coating material is obtained by pulverizing said mixture of the curing agent (B) and the curable polyester resin (A) which is obtained by removing the vapor of the solvent (C) therefrom.