Patent ID: 8912249
Filing Date: 2014-12-16
Classification: C09B,C09D

Abstract:
1. A method of making an encapsulated pigment comprising steps of: a) dispersing a pigment using a polymeric dispersant in an aqueous vehicle wherein the polymeric dispersant is selected from the group consisting of acrylic dispersant comprising acrylic and acrylate monomers and polyurethane dispersant and mixtures thereof and wherein the polymeric dispersant has a number average molecular weight of 2,000 to 9,500 daltons; b) adding at least one encapsulation monomer and at least one aqueous polyurethane dispersion to the aqueous vehicle of step (a) to form a first dispersed pigment/encapsulation monomer/polyurethane dispersion/aqueous mixture and wherein the encapsulation monomer comprises acrylate monomers; c) dispersing the encapsulation monomer/aqueous mixture using high shear mixing to form a second dispersed pigment/encapsulation monomer/aqueous polyurethane dispersion /aqueous mixture; and d) polymerizing the encapsulation monomer by adding a polymerization initiator to the second dispersed pigment/encapsulation monomer/aqueous polyurethane dispersion/aqueous mixture.