IMPROVEMENTS IN AND RELATING TO POWDER COATING COMPOSITIONS CROSS-LINKED WITH NON CYANURATE POLYEPOXIDES

摘要

The present invention relates to powder coating compositions and to components and ingredients for incorporation therein, suitable for fast curing schedule and with excellent resistance to outside aging. Non-isocyanurate polyepoxide cross-linking reagents can be used, provided the nature of the carboxylated polyester resin is formed of at least 30 mole % aromatic acid and the chain of the carboxyl terminated polyester also incorporates a moiety derived from 1,4 cyclohexanedicarboxylic acid. The powder coating composition can be cured for 90 seconds at a temperature of 250 °C or 55 seconds at 270 °C or 20 seconds in an induction oven at a temperature of 300 °C in the presence of a catalyst.