PROCESS FOR COATING PLASTIC SUBSTRATES WITH POWDER COATING COMPOSITIONS

摘要

A process of coating a preformed plastic sustrate susceptible to gassing upon heating characterised by the steps of: a) preheating the substrate at temperatures and for a time sufficient to degas the substrate, said temperatures being above the temperature sufficient to cure a subsequently applied powder coating composition; b) applying immediately a powder coating composition to the preheated substrate above the temperature sufficient to cure the powder coating composition; and c) heating immediately the coated substrate at a temperature and for a time sufficient to cure the powder coating composition, is disclosed. The method is effective in sealing the substrate against popping.