Preparation of polymeric particles

Details Preparation of polymeric particles Preparation of polymeric particles

C - Chemistry, Metallurgy

08

J

403/60

C08J 9/00 (2006.01) C08F 285/00 (2006.01)

Patent

CA 2038258

ABSTRACT OF THE DISCLOSURE PREPARATION OF POLYMERIC PARTICLES A process for the manufacture of core/shell polymer particles comprises forming a core particle containing acid functionality, a first shell around said core of a copolymer of a nonionic monoethylenically unsaturated aromatic monomer and a copolymerisable polar monomer in an amount of at least 15% by weight of the copolymer and having a solubility in water at 20°C of at least 1% by weight and a second shell around said first shell of a polymer or copolymer of a nonionic monomer having a solubility in water at 20°C of less than 1% by weight and swelling the particle with a non-volatile alkali to generate one or more vesicles. Preferably each shell contains a polymer or copolymer of styrene.

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