Thermosetting powder coating compositions containing flow modifiers
AssigneePPG Industries, Inc.
InventorsJames R. Franks, Paul H. Pettit, Jr.
Life of this patent
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Abstract
Thermosetting powder coating compositions comprising a curable particulate resinous material and a flow control agent which is a copolymer of an alkyl acrylate or methacrylate containing from 6 to 20 carbon atoms in the alkyl group and a hydroxyalkyl acrylate or methacrylate. The flow modifiers enhance the rheology of the thermosetting powder coating composition providing for smoother coatings while at the same time not adversely affecting appearance or adhesion with associated coatings, for example, previously applied electrodeposited primers or subsequently applied topcoats.
Claims17
A thermosetting powder coating composition comprising:
- (a) from 95.0 to 99.99 percent by weight of a curable particulate resinous material and
- (b) from 0.01 to 5.0 percent by weight of a flow control agent being a copolymer having a weight average molecular weight of at least 4000 and a glass transition temperature less than 10.degree. C.;
- said copolymer being prepared from polymerizing polymerizable ethylenically unsaturated monomers comprising:
- (i) 40 to 80 percent by weight of an alkyl acrylate or methacrylate containing from 6 to 20 carbon atoms in the alkyl group and
- (ii) from 10 to 50 percent by weight of a hydroxyalkyl acrylate or methacrylate.
Dependencies are inferred from the claim text.