Powder coating compositions containing polymer of ethylenically unsaturated glycidyl esters dicarboxylic acids and flow control agents

Abstract

Abstract POWDER COATING COMPOSITIONS ARE DISCLOSED. IN GENERAL, INDIVIDUAL POWDER COATING COMPOSITIONS ARE A MIXTURE OF THE FOLLOWING MATERIALS. A COPOLYMER OF GLYCIDYL METHACRYLATE AND AN ETHYLENICALLY UNSATURATED COMPOUND IS FORMED IN SUCH PROPORTIONS AS TO OBTAIN A COPOLYMER WITH A GLASS TRANSITION TEMPERATURE IN THE RANGE OF 40* C. TO 90*C. AND A MOLECULAR WEIGHT ($N) IN THE RANGE OF 2500 TO 8500. THE GLYCIDYL METHACRYLATE IS PRESENT IN THE COPOLYMER FROM AT LEAST ABOUT 8% BY WEIGHT TO NO MORE THAN ABOUT 25% BY WEIGHT. ANOTHER MATERIAL OF THE COATING COMPOSITION IS A SATRUATED, STRAIGHT CHAIN, ALIPHATIC DICARBOXYLIC ACID CONTAINING 4 TO 20 CARBON ATOMS PER MOLECULE IN THE AMOUNT OF 0.8 TO 1.1 CARBOXYLIC GROUPS FOR EACH EPOXY GROUP IN THE COPOLYMER. A THIRD MATERIAL UTILIZED IN FORMING THE POWDER COATING MIXTURE IS A FLOW CONTROL AGENT WHICH FORMS AT LEAST 0.05% BY WEIGHT OF THE MIXTURE. THE FLOW CONTROL AGENT IS A POLYMER HAVING A MOLECULAR WEIGHT ($N) OF AT LEAST 1000. THE FLOW CONTROL AGENT ALSO HAS, AT THE BAKING TEMPERATURE OF THE POWDER COATING COMPOSITION, A LOWER SURFACE TENSION THAN THE SURFACE TENSION OF THE COPOLYMER.

Inventors

• 👤 S Labana

Bibliographic Details