C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
117/183, 117/196
C08L 77/12 (2006.01) B05D 7/20 (2006.01) C08G 73/16 (2006.01) C08K 5/20 (2006.01) C08L 79/08 (2006.01) H01B 3/42 (2006.01)
Patent
CA 1089139
Abstract An aqueous coating composition containing in admixture a water soluble polyester, a water soluble orthoamic acid diamine and minor amounts of other water soluble polymeric coating materials. The water soluble orthoamic acid diamine is prepared by reacting in a suitable solvent for at least one reactant, an aromatic diamine and an aromatic dianhydride with the reactants in the molar ratio of m/(m-1) respectively, where m has a value between 2 and about 7. The diamine is dissolved in a solvent and the dianhydride is slowly added to the solution to form the orthoamic acid diamine. The reaction is carried out at a temperature below that at which imidization occurs. The reaction product may then be made water soluble by the addition of a volatile base such as ammonia or a volatile amine. Water solutions of polyester resins and the orthoamic acid diamine are utilized to produce coatings on substrates such as magnet wire. Water soluble phenol-formaldehyde resins, aminoplasts, epoxy resins and the like, and accelerators and other ingredients may be added to the coating solution. Coatings produced on substrates, including magnet wire, may be heat cured to form clear, tough, flexible, adherent solvent resistant dielectric thermally stable coatings.
231465
Company General Electric
Eckersley Raymond A.
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