Polymeric particles and their preparation
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United States of America Patent
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Apr 24, 1990
Issued Date -
N/A
app pub date -
Jul 10, 1989
filing date -
Jul 30, 1987
priority date (Note) -
Expired
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Abstract
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 percent 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.
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