Production of core-sheath polymer particles containing voids, resulting product and use
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United States of America Patent
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Jun 10, 1986
Issued Date -
N/A
app pub date -
Jan 11, 1985
filing date -
Jan 11, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Process for making core-sheath polymer particles containing voids, said particles useful for opacifying, comprising (A) emulsion polymerizing a core from a core monomer system comprised of at least one ethylenically unsaturated monomer containing acid functionality; (B) encapsulating said core with a hard sheath by emulsion polymerizing a sheath monomer system in the presence of said core, said sheath permitting penetration of fixed or permanent bases; (C) swelling at elevated temperature the resultant core-sheath polymer particles with fixed or permanent base so as to produce a dispersion of particles which, when dried, contain a microvoid which causes opacity in compositions in which they are contained, provided that either (1) said sheath comprises at least about 1% acid functional monomer or (2) said swelling takes place in the presence of solvent. Compositions comprising said core-sheath polymer particles are also disclosed.
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