COATING SYSTEM COMPRISING HIGH ACID RESIN
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United States of America Patent
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Issued Date -
Dec 6, 2012
app pub date -
May 16, 2012
filing date -
May 24, 2011
priority date (Note) -
Abandoned
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Abstract
A coating system for application to a substrate having a sol-gel film layer applied thereon includes a residual high acid value coating coat applied on top of the sol-gel film without an intervening adhesion layer. The residual high acid value coating composition may be a solvent borne composition that when cured, has a high level of residual free acid groups, equivalent to an acid number of greater than about 65 mgKOH/g. The residual high acid value coating may include a residual high acid value resin namely, a resin that cures having residual free acid groups, equivalent to an acid number of greater than about 65 mgKOH/g. The residual high acid value resin may be the reaction product of a polyol and a suitable crosslinker, such as a polyanhydride or polyisocyanate crosslinker or blend thereof. The residual high acid value coating composition may include opacifying pigments and condensation catalysts.
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