C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
117/184, 117/196
C08L 77/00 (2006.01) C08G 73/10 (2006.01)
Patent
CA 1071787
Abstract A coating medium for application to a substrate to form a coating which is curable to a highly cross-linked polymeric state. A coating medium 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 two-to-one respectively. The diamine is dissolved in a solvent, and the dianhydride is slowly added to the solution to form a diamide-diacid-diamine monomer. The reaction is carried out at a temperature below that at which imidization occurs. The reaction product may be made water soluble by the addition of a volatile base. A coating of the medium is applied to a substrate as a thin film and the film coating is cured at a temperature sufficient to form a highly cross-linked polymeric coating on the substrate. Suitable aromatic dianydride reactants include 3,3',4,4'-benzophenonetetracarboxylic dianhydride and 4,4'-(2-acetoxy-1,3-glyceryl)bis-anhydro trimellitate, and suitable aromatic diamine reactants include 4,4'- diaminodiphenyl methane, 4,4'-diaminodiphenyl ether, and 1,3-diamino benzene. Upon application of a coating of the monomer solution to a substrate and upon cure of the coating to drive off the solvent and effect polymerization, inter- molecular amidization and imidization reactions occur resulting in what are believed to be highly cross-linked ladder-type polymeric coatings.
226879
Company General Electric
Na
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