Coacervation processes

Details Coacervation processes Coacervation processes

B - Operations, Transporting

01

J

B01J 13/08 (2006.01)

Patent

CA 2131548

2131548 9318853 PCTABS00025 The invention relates to processes for forming particles which have a core of core material within a shell of polymeric material that has been deposited by coacervation. According to the invention there is provided a dispersion of particles of core material in an aqueous solution of a pH-sensitive polymeric material at a pH at which the polymeric material is soluble. The polymeric material is deposited as a shell around the core material by insolubilisation of the polymeric material caused by adjusting the pH of the solution to a pH at which the polymeric material is insoluble. The adjustment of the pH is conducted at a rate that is sufficiently slow and homogeneous throughout the solution so that the polymeric material deposits substantially only as a substantially uniform coacervate around the individual core particles.

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