Patent ID: 7598316
Filing Date: 2009-10-06
Classification: B01J,C08F,Y10T

Abstract:
1. A process for the preparation of polymer magnetic particles, which comprises: (a) providing a water phase containing magnetic components homogeneously dispersed therein; (b) wherein the water phase is contacted with or further contains a polymerisable monomer comprising a metal oxide or hydroxide, or a metal alkoxide precursor compound which is converted to said monomer by hydrolysis, which is soluble in the water phase; and wherein if the metal in the metal alkoxide is silicon the metal alkoxide is tetraalkoxysilane; (c) polymerising the monomer in the presence of the magnetic components so as to form polymer magnetic particles in which the magnetic components are substantially uniformly distributed; wherein at least a part of the polymerising step (c) is carried out in a water-in-oil emulsion in which the water phase containing the magnetic components homogeneously dispersed therein is present as a discontinuous phase in a continuous oil phase, and wherein said process results in the magnetic particles being substantially uniformly distributed throughout the entire polymer matrix of said polymer particle.