Low bake powder coating resins
AssigneesAllnex USA Inc., Allnex Italy Srl
InventorsRoberto CAVALIERI, Callistus Ugoh EZEAGU
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Abstract
The present invention relates to powder coating compositions for low temperature cure between 100° C. and 150° C. The powder coating composition comprises: a) a carboxylic acid functional resin A which is a polyester resin A having carboxylic acid groups, b) a first glycidyl functional resin B1 which is a bisphenol A based epoxy resin having glycidyl groups, c) a second glycidyl functional resin B2 which is a phenol or cresol epoxy novolac resin having glycidyl groups, and d) At least one thermosetting curing catalyst C. Such powder coating composition may exhibit, upon curing, an excellent combination of physical properties such as smoothness, flexibility, hardness and, above all, an outstanding durability for the MEK impregnation test.
Claims17
A powder coating composition for curing at low temperature between 100° C. and 150° C. which comprises:
- a. a carboxylic acid functional resin A which is a polyester resin A having carboxylic acid groups,
- b. a first glycidyl functional resin B1 which is a bisphenol A based epoxy resin having glycidyl groups,
- c. a second glycidyl functional resin B2 which is a phenol or cresol epoxy novolac resin having glycidyl groups, and
- d. At least one thermosetting curing catalyst C.
Dependencies are inferred from the claim text.