Hybrid polyester-fluorocarbon powder coating compositions and methods of coating substrates with such compositions

摘要

The present invention provides a hybrid polyester-fluorocarbon powder coating composition, wherein the hybrid polyester-fluorocarbon powder coating composition is a dry blend of a polyester powder coating composition A and a fluorocarbon powder coating composition B, wherein the poly The ester powder coating composition A comprises a first polyester polymer and a curing agent for the first polyester polymer; Fluorocarbon powder coating composition B comprises a fluorocarbon polymer, a curing agent for such a fluorocarbon polymer, a second polyester polymer and a curing agent for such a second polyester polymer; The weight ratio of the polyester powder coating composition A to the fluorocarbon powder coating composition B is in the range of from 25:75 to 75:25 and the first polyester polymer has an acid value in the range of 18 to 70 mg KOH / And the second polyester polymer is a hydroxyl functional polyester polymer having a hydroxyl value in the range of 70 to 350 mg KOH / g of polymer. Further, the present invention provides a method of coating such a hybrid polyester-fluorocarbon powder coating composition on a substrate.