MODIFIED POLYESTER RESIN/ORGANIC PEROXIDE SYSTEMS FOR POWDER COATINGS WHICH ARE APPLICABLE TO TEMPERATURE SENSITIVE AND METALLIC SUBSTRATES

摘要

New modified polyester resin/organic peroxide systems for powder coatings which are applicable to temperature sensitive and metallic substrates include (a) a polyester resin which is a hydroxylated or carbonxylated polyester with unsaturation in its chain, and (b) an organic peroxide with a minimum curing temperature of between 140° and 190° C.; the relative proportions of resin and organic peroxides being 55-60% by weight of resin based on the final composition and 0.5-3.0 by weight of organic peroxide based on the final formulation. These systems find their main application in the manufacture of powder coatings for the coating of temperature sensitive substrates like plastics and metallic substrates, especially aluminum substrates, using the systems currently existing in industry.