Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1974-06-03
1977-01-18
Lee, Lester L.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
260 465E, 260 47CP, 260 49, 260 65, 260 78TF, 2604482B, 2604482H, 2604482N, 260558A, 260559D, 260926, 260934, C07C10374
Patent
active
040039471
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 dianhydride 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, intermolecular amidization and imidization reactions occur resulting in what are believed to be highly cross-linked ladder-type polymeric coatings.
REFERENCES:
patent: 3505295 (1970-04-01), Grunsteidl et al.
patent: 3652500 (1972-03-01), Peterson
patent: 3663510 (1972-05-01), Peterson
General Electric Company
Lee Lester L.
Papin Joseph E.
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