Preparation of vesiculated core/shell polymeric particles
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United States of America Patent
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Jul 20, 1993
Grant Date -
N/A
app pub date -
Mar 21, 1991
filing date -
Mar 30, 1990
priority date (Note) -
Expired
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Abstract
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.degree. 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.degree. 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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