Sag control of high solid polyurethane clearcoats by urea thixot

Details Sag control of high solid polyurethane clearcoats by urea thixot Sag control of high solid polyurethane clearcoats by urea thixot

1984-07-20

1985-07-09

Jacobs, Lewis T.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524500, 524871, 524872, 524875, C08K 336

Patent

active

045283192

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.

REFERENCES:
patent: 4387194 (1983-06-01), Ottaviani et al.

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