High-solids coatings resins via controlled radical polymerization
AssigneeAtofina Chemicals, Inc.
InventorsPeter A. Callais, Puvin Pichai, Michael G. Moskal, Olivier Guerret
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Abstract
Processes for the controlled radical polymerization of acrylic and related polymers to produce improved low VOC coating materials, or powder coating compositions, the novel polymers so produced, the catalyst systems employed, processes for application of the improved coatings, coatings so produced and objects coated on at least one surface with the novel coatings are disclosed.
Claims32
A process for the controlled free radical solution polymerization to a level of solids suitable for use as low volatile organic solvent coating compositions while maintaining viscosity suitable for such coatings of monomers comprising substituted or unsubstituted acrylic acid, or esters thereof in a solvent suitable for high solids coating application at a monomer concentration sufficient to give the desired polymer concentration which comprises treating said monomers in said solvent with a controlled free radical initiator selected from the group N,N-dialkyl-alkoxyamines having one hydrogen atom on one carbon atom in the α position of one alkyl group attached to the amino nitrogen, nitroxyl radicals having one hydrogen atom on one carbon atom in the a position of one alkyl group attached to the nitroxyl nitrogen and mixtures thereof.
A process as defined in 11 wherein the monomers comprise glycidyl methacrylate, butyl methacrylate, ethyl acrylate, methyl acrylate, methyl methacrylate, methacrylic acid, hydroxypropyl acrylate, hydroxypropyl methacrylate, acetoacetoxy ethyl acrylate, acetoacetoxy ethyl methacrylate and mixtures thereof.
Dependencies are inferred from the claim text.