Polymeric particles and their preparation
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jul 30, 1991
Issued Date -
N/A
app pub date -
Dec 17, 1990
filing date -
Dec 17, 1987
priority date (Note) -
Expired
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Abstract
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-volatile permanent or fixed base. The sheath is a coploymer of an ethylenically unsaturated aliphatic monomer free of acid groups and at least 2 percent by weight of a soft ester-containing monomer and optionally styrene in an amount of up to 25 mole percent. The core is formed from an ethylenically unsaturated monomer with acid functionality. The sheath polymer has a glass transition temperature of at least 40.degree. C. The particles have a size of up to 40000 nanometers before swelling the core by some 150 to 2000 percent.
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