Continuous process for preparing resin particles in a liquid

Details Continuous process for preparing resin particles in a liquid Continuous process for preparing resin particles in a liquid

C - Chemistry, Metallurgy

08

F

400/7010

C08F 2/12 (2006.01) G03G 9/12 (2006.01) G03G 9/135 (2006.01)

Patent

CA 2030149

37 TITLE CONTINUOUS PROCESS FOR PREPARING RESIN PARTICLES IN A LIQUID ABSTRACT OF THE DISCLOSURE A continuous process for the preparation of a dispersion of liquid and resin or polymer particles having at least one additive dispersed in the resin comprising A introducing an intimate blend of resin and at least one additive continuously into or blending the ingredients in an apparatus having means for melting the resin and dispersing the additive in the resin, B melting the resin in the apparatus at an elevated temperature but below that at which the resin and/or additive decomposes, C moving continuously the blend of melted resin and additive through at least one mixing element of the apparatus dispersing thoroughly the additive in the melted resin (molten blend), D forming a dispersion by introducing into the molten blend while still in at least one mixing element a liquid in which the resin and additive(s) are substantially insoluble and thoroughly mixing molten blend in the in the liquid, the temperature in the at least one mixing element being maintained above the temperature at which the molten blend remains in its molten state, and E introducing continuously the dispersion into a high shear cooling apparatus wherein the molten blend solidifies forming a stable dispersion of resin particles in the liquid. The process is useful for preparing resin particles in a liquid or electrostatic liquid developers more quickly and economically than by other processes, the resin or toner particles having controlled particle size. 37

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