Back to results
US 9,957,394 B2Granted
Methods for preparing powder coating compositions
AssigneePPG Industries Ohio, Inc.
InventorsHongying Zhou, Anthony Chasser, Shanti Swarup
Life of this patent
Estimating the term…
Abstract
Disclosed is a method for preparing powder coating compositions. The method includes mixing in an aqueous medium a carboxylic acid functional polymer having a high glass transition temperature, with a polycarbodiimide having a high glass transition temperature, drying the mixture, and grinding the resulting solid particles to obtain a powder.
Claims18
A method for preparing a powder coating composition comprising:
- a) mixing in an aqueous medium
- (i) a carboxylic acid functional polymer having a glass transition temperature of at least 50° C., with
- (ii) a polycarbodiimide, having urethane and/or urea linkages and having a glass transition temperature of at least 50° C., wherein the polycarbodiimide is prepared by reacting a polyisocyanate in the presence of a catalyst to form a polycarbodiimide and extending the polycarbodiimide by the addition of a cyclic diol during or after polycarbodiimide formation;
- b) drying the mixture of (i) and (ii) to obtain solid particles;
- and
- c) grinding the solid particles to obtain a powder.
3 more elements
Dependencies are inferred from the claim text.