Sag control of high solid polyurethane clearcoats by urea thixotrope/silica systems
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United States of America Patent
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Jul 9, 1985
Grant Date -
N/A
app pub date -
Jul 20, 1984
filing date -
Jul 20, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Novel, high solids urethane clearcoat compositions having improved flow characteristics by the incorporation of a flow control system composed of urea thixotrope/silica additives. The urea thixotrope constituent is prepared by reacting a polyether polyol with a stoichiometric excess of a saturated cyclic aliphatic polyisocyanate to produce isocyanate-terminated prepolymers. These prepolymers are then modified by reaction with an ethanolamine to form urea endcapped thixotropes which are compatible in structure with any urethane clearcoat system. A combination of one of these urea thixotropes and a finely divided transparent silica is used effectively to reduce sagging of high solids urethane clearcoat systems. In fact, the combination of the two components produces a synergistic effect which is greater than that expected from any one of the components in the flow control system.
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