Production of core-sheath polymer particles containing voids, re

Details Production of core-sheath polymer particles containing voids, re Production of core-sheath polymer particles containing voids, re

1985-01-11

1986-06-10

Lovering, Richard D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

264 53, 523201, 525902, C08J 928

Patent

active

045943630

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.

REFERENCES:
patent: 3359130 (1967-12-01), Goldman
patent: 3864181 (1975-02-01), Wolinski et al.
patent: 4008304 (1977-02-01), Koyama et al.
patent: 4089800 (1978-05-01), Temple
patent: 4427836 (1984-01-01), Kowalski et al.
patent: 4479911 (1984-10-01), Fong

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