Polymeric particles and their preparation

Details Polymeric particles and their preparation Polymeric particles and their preparation

C - Chemistry, Metallurgy

08

J

117/46.2, 117/47

C08J 9/28 (2006.01) C08F 265/02 (2006.01) C08F 265/04 (2006.01) C09D 151/00 (2006.01)

Patent

CA 1337163

Swollen core/sheath polymeric particles are disclosed having one or more voids in the core formed by reaction with a base such as sodium hydroxide. The sheath contains styrene or similar monomer polymerized in an amount greater than 25 mole per cent and the polymer is free of acid groups. The core contains acid groups. Swelling is effected at an elevated temperature and in the absence of an organic solvent. The swollen particles on drying in a paint or other composition have air in the voids and act then as opacifying agents.

572047

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