Abstract: Novel, high solids urethane clearcoat compositions having improved flow characteristics by the incorporation of a flow control system composed of urea thixotrope/acrylic microgel 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 end-capped thixotropes which are compatible in structure with any urethane clearcoat system. A combination of one of these urea thixotropes and a polymethyl methacrylate microgel of fine particle size 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.

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.

Abstract: Waterborne acrylic copolymer-melamine enamels have a long storage life at room temperature and yet are curable at relatively low temperatures when containing suitable sulfamate ester curing agents such as ethyl N,N-dimethylsulfamate.

Abstract: A blood cell recognition system is provided which includes scanning means for generating signals representative of a pattern in a whole blood smear scanned by the scanning means. Means for examining the signals from the scanning means for generating parameters of the pattern scanned are provided with pattern recognition means responsive to the parameters for identifying the pattern scanned and an operator keyboard for entering data relating to the pattern scanned. An interface is provided between the means for examining and the pattern recognition means which includes first temporary storage means for receiving parameters relating to a cell being scanned, and second temporary storage means for receiving data from said keyboard and buffer storage means for entry of said parameters and said data into said pattern recognition means to enable the pattern recognition means to recognize the pattern in accordance with both the parameters and the data.