COATING COMPOSITIONS WITH FLOW MODIFIERS AND THE FLOW MODIFIERS AND MULTILAYERED COATINGS

摘要

Curable coating compositions comprising either a liquid or particulate curable film-forming resinous material, a flow control agent which is a copolymer and optionally a carrier for the liquid resinous material. The copolymer is from at least one non-amino, non-hydroxyl and non-acid functional alkyl acrylate or methacrylate containing from 1 to 20 carbon atoms in the alkyl group, and functional monomer of either (i) amino functional acrylates and methacrylates in an effective amount to give the copolymer an amine value in the range from 2 to 25, or (ii) acid functional acrylate and methacrylate in an effective amount to give the copolymer an acid value in the range of from 10 to 30. Additionally, with either functional monomer (i) or (ii) another functional comonomer (iii) can be present in the copolymer which is hydroxyalkyl acrylate and/or hydroxyalkyl methacrylate and/or caprolactone polyol monomer. Comonomer (iii) can be present in the copolymer in an effective amount to give the copolymer a hydroxyl number which is in the range of about 0 to 100. The copolymer flow modifiers enhance the rheology of the curable film-forming resinous material like thermosetting powder coating compositions to provide for smoother coatings while at the same time not adversely affecting appearance or adhesion with associated coatings, for example, basecoats when the coating composition is a clearcoat.