Powder coating compositions containing glycidyl ester copolymers,carboxy terminated polymeric crosslinking agents,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 ($N) IN THE RANGE OF 2500 TO 8500. THE GLYCIDYL METHACRYLATE IS PRESENT IN THE COPOLYMER FROM AT LEAST ABOUT 8% BY WEIGHT TO NO MORE THAN ABOUT 30% BY WEIGHT. ANOTHER MATERIAL OF THE COATING COMPOSITION IS A CROSS LINKING AGENT FORMED OF A CARBOXY TERMINATED POLYMER PRESENT IN THE AMOUNT OF 0.8 TO 1.1 CARBOXY GROUPS FOR EACH EPOXY GROUP IN THE COPOLYMER. A THIRD MATERIAL USED IN FORMING THE POWDER COATING MIXTURE IS A FLOW CONTROL AGENT WHICH FORMS AT LEAST 0.05% BY WEIGHT OF THE MIXTURE. THE FLOW CONTROL AGENT IS A POLYMER HAVING A MOLECULAR WEIGHT ($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
- 👤 Y Chang
Bibliographic Details
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