Application of plastic materials onto metallic components
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United States of America Patent
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Oct 9, 2001
Grant Date -
N/A
app pub date -
Feb 16, 2000
filing date -
Jun 18, 1997
priority date (Note) -
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Abstract
The method of applying plastic material or layers containing plastic material onto metallic components is effected such that a) the components are brought in contact with a solution or dispersion containing 5 to 50 wt-% organic polymer, b) the solution or dispersion is dried on, c) the components are brought in contact with a qualitatively substantially identical solution or dispersion in accordance with stage a), which only contains 0.5 to 5 wt-% organic polymer, and d) are finally dried. Preferably, the solution or dispersion contains a chromium(VI) and/or chromium(III) compound and/or adhesion-promoting pigments, flow-control agents and/or defoaming agents (additives). Further preferred aspects of the invention consist in that the components are brought in contact with a solution or dispersion having a temperature of 5 to 40.degree. C., drying on in accordance with stage b) is effected at a temperature in the range from 40 to 60.degree. C., and the final drying in accordance with stage d) is effected at an elevated temperature up to 200.degree. C. The outstanding advantage of the invention lies in the use of the method for the pretreatment of the components for the subsequent powder coating.
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