Method of sizing monomer droplets for suspension polymerization to form small particles
AssigneeXerox Corporation
InventorsEdward Vanzo, Lewis S. Smith
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Abstract
A method of forming particles of between about 5 and about 50 microns utilizing a two stage process wherein monomer possibly containing pigments, dyes and/or fillers such as silicon and magnetite, as well as chemical reagents such as crosslinking agents and chain transfer agents, is sized to a narrow range by high shear mixing then polymerized during slow speed agitation to form polymeric particles.
Claims9
A method of small particle formation comprising mixing a monomer composition in an aqueous solution comprising water and a stabilization agent, subjecting the mixture to high shear agitation for a short time of about 0.5 to about 5 minutes to size the monomer, transferring the sized monomer to a reaction vessel, slowly agitating the sized monomer in said reaction vessel, polymerizing the monomer and recovering polymeric particles of small, uniform size distribution wherein 95 percent of said polymeric particles range between about 5 and about 25 microns as a result of said shear agitation to size the monomer.
Dependencies are inferred from the claim text.