Patent ID: 7125931
Filing Date: 2006-10-24
Classification: B05D,C08F,C08G,C08L,C09D,Y10T

Abstract:
1. A method of electrocoating a conductive substrate serving as a cathode in an electrical circuit comprising said cathode and an anode, said cathode and anode being immersed in an aqueous electrocoating composition, comprising passing electric current between said cathode and anode to cause deposition of the electrocoating composition on the substrate as a substantially continuous film, the aqueous electrocoating composition comprising: (a) an ungelled copolymer composition comprising segments comprising alternating residues derived from a donor monomer composition comprising one or more monomers selected from the group consisting of isobutylene, diisobutylene, dipentene and isoprenol, and an acceptor monomer composition comprising acrylic monomers, and residues from monomers containing functional groups which include functional monomers with a functional group containing one or more active hydrogen groups and residues from monomers containing salt groups, wherein said ungelled copolymer composition is substantially free of transition metals, Lewis acids, maleate-type monomer residues, and fumarate-type monomer residues; and (b) a curing agent having at least two functional groups which are reactive with the active hydrogen groups of (a).