Patent ID: 8686096
Filing Date: 2014-04-01
Classification: B01D,B01J,C08F,C08L

Abstract:
1. A method for making swellable particles, said method comprising mixing initial particles, at least one monomer, at least one oil-soluble initiator, and at least one chain-transfer agent, wherein said mixing is performed under conditions in which said monomer reacts to form oligomer; wherein said initial particles comprise an organic compound, wherein said oil-soluble initiator has solubility in water at 20° C., by weight, based on the weight of water, of 1% or less, wherein said initiator forms free radicals, wherein said oligomer or low molecular weight polymer has number-average molecular weight of less than 2,000, wherein the amount of said chain-transfer agent is 10% or more, by weight based on the total weight of said monomer, wherein the mean particle diameter said swellable particles is larger than the mean particle diameter of said initial particles by a factor of 2 times or higher, and wherein said swellable particles have mean particle diameter of 1 micrometer or more.