Polymeric particles and their preparation

Details Polymeric particles and their preparation Polymeric particles and their preparation

B - Operations, Transporting

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117/47.3

B01J 13/14 (2006.01) B01J 13/20 (2006.01) C08F 265/02 (2006.01) C08F 265/04 (2006.01) C08F 267/02 (2006.01) C08F 285/00 (2006.01) C08K 7/22 (2006.01)

Patent

CA 1299451

CASE 423 ABSTRACT OF THE DISCLOSURE POLYMER PARTICLES AND THEIR PREPARATION Polymer particles or beads for use as opacifiers in paints are described in which a core is provided with a hard sheath and the particle has one or more voids produced by reaction with a non- colatile permanent or fixed base. The sheath is a copolymer of an ethylenically unsaturated aliphatic monomer free of acid groups and at least 2 per cent by weight of a soft ester-containing monomer and optionally styrene in an amount of up to 25 mole per cent. The core is formed from an ethylenically unsaturated monomer with acid functionality. The sheath polymer has a glass transition temperature of at least 40°C The particles have a size of up to 40000 nanometers before swelling the core by some 150 to 2000 per cent.

584604

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