Polymer dispersion is produced by polymerization of at least two different ethylenically unsaturated monomers in at least first and second stages. Any polymer produced in further polymerization stages comprises no more than 10% by weight of the total monomer composition and the glass transition temperature of the hypothetical uniform copolymer produced by the total monomer composition. The dispersion polymerization approach might offer an effective solution to bead production in many situations if the precise balance of solvent composition, imprinting recipe and synthetic conditions can be appropriately matched to produce particles with the desired size, morphology, porosity and binding characteristics.
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