Powdered coating compositions containing glycidyl methacrylate copolymers with anhydride crosslinking agents and flow control agent

Abstract

Abstract POWDER COATING COMPOSITIONS ARE DISCLOSED. IN GENERAL, INDIVIDUAL POWDER COATING COMPOSITIONS OF THIS INVENTION ARE A MIXTURE OF SEVERAL MATERIALS. ONE OF THE IMPORTANT MATERIALS IS A COPOLYMER OF GLYCIDYL METHACRYLATE AND AN ETHYLENICALLY UNSATURATED COMPOUND FORMED TO OBTAIN A COPOLYMER WITH A GLASS TRANSITION TEMPERATURE IN THE RANGE OF 40*C. AND A MOLECULAR WEIGHT ($N) IN THE RANGE OF 2500 TO 8500. THE GLACIDYL METHACRYLATE IS PRESENT IN THE COPOLYMER FROM AT LEAST ABOUT 5% BY WEIGHT TO NO MORE THAN ABOUT 20% BY WEIGHT. ANOTHER IMPORTANT MATERIAL OF EACH COATING COMPOSITION IS A CROSSLINKING AGENT FORMED IN AN ANHYDRIDE OF A DICARBOXYLIC ACID PRESENT IN THE AMOUNT OF 0.4 TO 1.0 ANHYDRIDE GROUPS FOR EACH EPOXY GROUP IN THE COPOLYMER, A THIRD IMPORTANT MATERIAL USED IN FORMING EACH POWDER COATING COMPOSITION IS A FLOW CONTROL AGENT WHICH FORMS AT LEAST 0.05% BY WEIGHT OF THE MIXTURE. THE FLOW CONTROL AGENT IS A POLYMER HAVING A MOLECULAR WEIGHT ($N) OF AT LEAST 1000. THE FLOW CONTROL AGENT ALSO HAS A GLASS TRANSITION TEMPERATURE AT LEAST 50*C. BELOW THE GLASS TRANSITION TEMPERATURE OF THE COPOLYMER. OTHER MATERIALS SUCH AS PIGMENTS, CATALYSTS, ANTISTATIC AGENTS AND PLASTICIZERS MAY BE USED IN INDIVIDUAL COMPOSITIONS.

Inventors

• 👤 A Theodore
• 👤 S Labana

Bibliographic Details