Patent ID: 7255895
Filing Date: 2007-08-14
Classification: C08J

Abstract:
1. A method for generating a plurality of microparticle populations of different dye concentrations wherein dye is loaded into polymer microparticles to generate said microparticle populations, comprising: (a) providing: (b) forming a plurality of suspensions of said polymer microparticles, each in a designated volume of a mixture including the tuning solvent and the third solvent; (c) adding to said polymer microparticle suspension a solution including the dye dissolved in said first solvent to form a homogeneous solution in the mixture of the first, tuning and third solvents; and (d) increasing the uptake of dye into the polymer microparticles in at least one of said populations relative to another of said populations by decreasing the solvency of the mixture of the first, tuning and third solvents for the dye.