C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
400/5333, 402/9
C08G 18/48 (2006.01) C08G 18/58 (2006.01) C08G 18/72 (2006.01) C08G 18/78 (2006.01) C08G 59/40 (2006.01) C08G 77/00 (2006.01)
Patent
CA 1043041
A B S T R A C T A novel improved, urethane coating for metallic or non-metallic susbtrates and the like exhibits improved resistance to blistering under hight 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, pre- ferably 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 chromated 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 eposy resin to -NCO groups in the hardener is about 1:1.4-3.6.
209742
Lockheed Aircraft Corporation
Na
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