Polyester resin powder coating compositions.

摘要

The invention consists of a new method of curing a polyester powder coating composition. The resin is cured by the use of an organotitanium or organozirconium derivative of an alkanolamine having the formula M3[(OR)3N]4 or O[M(OR)3N]2 or R<1>[OM(OR)3N]x where M represents Ti or Zr, R represents a divalent aliphatic radical, x is 1 to 4 and R<1> is a saturated hydrocarbyl group or a group containing one or more ether linkages. The method is suitable for use with both hydroxyl-rich and carboxyl-rich polyester resins and the cured coatings have desirable physical properties.