Flow control agent for ultra thin epoxy resin powder coatings
AssigneeW. R. Grace & Co.
InventorsDonald Wayne Larsen, Jerrold Bain Billmyer
Life of this patent
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Abstract
A thermosetting resin composition consisting essentially of a solid epoxy resin having a molecular weight in the range 1,000-4,000, 1-15% by weight of the epoxy resin of a curing agent therefor and 0.5 to 3.0% by weight of the composition of a flow control agent consisting essentially of liquid poly(ethyl acrylate) having a number average molecular weight in the range 5,000 to 15,000. The composition when melt compounded and milled to an average particle size diameter of 2-20 microns can be electrostatically deposited onto metallic surfaces such as can interiors to produce an ultra thin (0.3-1.0 mil thick) protective coating on curing.
Claims3
The process of coating a metal substrate which comprises electrostatically depositing on said substrate in an amount sufficient to attain a cured coating having a thickness in the range of 0.3-1.0 mil a particulate thermosetting resin composition consisting essentially of a solid epoxy resin formed from the reaction of bisphenol A and epichlorohydrin and having a molecular weight in the range 1,000-4,000, 1-15% by weight of the epoxy resin of a curing agent therefor and 0.5-3.0% by weight of the composition of a flow control agent consisting essentially of liquid poly(ethyl acrylate) having a number average molecular weight in the range 5,000-15,000, the particles of said composition having an average size diameter of 2-20 microns and thereafter heating said coated substrate to form a continuous coating thereon.
An article having a fused epoxy resin coating, said coating containing 1-15 parts by weight of the epoxy resin of a curing agent therefor and 0.5-3.0 parts by weight of the epoxy resin and curing agent of a flow control agent consisting essentially of liquid poly(ethyl acrylate) having a number average molecular weight in the range 5,000- 15,000.
A coated article comprising a substrate and a coating thereon, said coating comprising the fused product of an intimate mixture of an epoxy resin formed from the reaction of bisphenol A and epichlorohydrin and having a molecular weight in the range 1,000-4,000, 1-15% by weight of the epoxy resin of a curing agent therefor and 0.5-3.0% by weight of the coating of a flow control agent consisting essentially of liquid poly(ethyl acrylate) having a number average molecular weight in the range 5,000-15,000.
Dependencies are inferred from the claim text.