Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1974-09-30
1977-03-15
Michl, Paul R.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 296MM, 260 297R, 260 297M, 427435, C08L 908
Patent
active
040123510
ABSTRACT:
An acidic aqueous coating composition containing an organic coating-forming material forms on a metallic surface immersed therein a coating, the weight or thickness of which is related to the time the surface is immersed in the composition. The coating composition, which tends to become unstable as a result of the build up of metal ions in the composition, is stabilized by removing the metal ions with an ion exchange material. Also, in maintaining stability, anionic and/or nonionic surfactants or dispersing agents, which are present in the composition to disperse the organic-coating forming material, are added to the composition in an amount in excess of that which is added to replenish the organic coating-forming material as it is consumed during use. Also, coating compositions treated with the ion exchange material tend to produce coatings which have a textured or grainy appearance. The texturing of coatings can be avoided by contacting the coating composition with the ion exchange material in the presence of a cationic surfactant or an amphoteric surfactant which has cationic properties in the acidic aqueous coating composition, or other material which maintains the relatively small particles of the organic coating-forming material in the composition.
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Hall Wilbur S.
Leister Harry M.
Amchem Products Inc.
Michl Paul R.
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