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AssigneeDow Global Technologies LLC
InventorsZhe Jia, John B. Cuthbert, David L. Malotky, Stacey A. Saba, Bruce D. Hook, Nathan Wilmot, Daniel L. Dermody
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A continuous process for producing a polyurea concentrate or powder. The process includes combing at least one amine and an isocayante in the presence of a liquid diluent or a base oil in a rotor stator mixer. The concentrate comprises a polyurea in a base oil wherein the concentration of from about 20 weight percent to about 50, or 40 or 35 or 30 weight percent of polyurea based on total weight of grease thickener. The powder has particle size of 2 to 400 microns. This concentrate or powder can then be formulated by grease manufacturers to the desired final properties without the need for handling of the isocyanate and amine raw materials.
A process comprising providing at least one amine and a first base oil to a rotor stator mixer which is operating at a shear rate of less than 5000 reciprocal seconds (l/sec), adding a isocyanate to the rotor stator mixer in a shear zone of the rotor stator mixer and in a position located at a distance from an outlet of the rotor stator mixer that is not more than half the diameter of the rotor stator mixer such that a residence time in the mixer after addition of the isocyanate is less than 20 seconds to produce a grease thickener concentrate comprising a polyurea.
A process for preparing a polyurea compound comprising reacting an amine and a polyisocyanate in the presence of a liquid diluent in a rotor stator mixer under conditions sufficient to produce a dispersion of the polyurea compound in the liquid diluent wherein the polyisocyanate is fed to the rotor stator mixer at a distance that is no more than half the diameter of the rotor stator mixer from an outlet of the rotor stator mixer and directly into a shear zone of the rotor stator mixer to form a polyurea.
Dependencies are inferred from the claim text.