Coating

Details Coating Coating

1973-09-24

1976-05-04

Welsh, M. J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 47CB, 260 775AP, 428339, C08q 2208

Patent

active

039546934

ABSTRACT:
A novel improved urethane, urethane coating formed of epxoy resin and polyisocyanate for metallic or non-metallic substrates and the like exhibits improved resistance to blistering under high moisture conditions. The coating includes an epoxy resin having functional hydroxyl groups, for example, the reaction product of epichlorohydrin and bisphenol A. A hardener is included which comprises one or more selected polyisocyanates, preferably a mixture of a selected aliphatic biuret type polyisocyanate and an aromatic diisocyanate. A coupling agent, preferably an epoxy-containing silane, is included. A catalyst such as zinc octoate, pigments such as leachable chromates and organic solvent for the components may also be included. The pigments are held in suspension through the use of a suspending agent. The ratio of --OH groups of the epoxy resin to --NCO groups in the hardener is about 1:1.4-3.6.

REFERENCES:
patent: 2594979 (1952-04-01), Nelson
patent: 2897166 (1959-07-01), Eitel et al.
patent: 3061483 (1962-10-01), Coles et al.
patent: 3124605 (1964-03-01), Wagner
Lee et al., Handbook of Epoxy Resins, McGraw-Hill, N.Y., 1967, pp. (10)18, (15)9-11, (15)13-15, (19)12-14 & (24)36.
Chem. Abstracts (Senda et al.) 49, 1955, p. 9321f.
Chem. Abstracts (Moeller), 70, 1969, p. 68991z.

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