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Polymeric microspheres were prepared from water-insoluble polymers by a novel technique without the use of organic solvents. Aqueous colloidal polymer dispersions (latexes or pseudolatexes) were emulsified into a heated external oil phase to form a w/o emulsion. The colloidal polymer particles fused (coalesced) into homogeneous polymeric microspheres at temperatures above the minimum film formation...
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