发明名称 |
Production of core-sheath polymer particles containing voids, resulting product and use |
摘要 |
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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申请公布号 |
US4594363(A) |
申请公布日期 |
1986.06.10 |
申请号 |
US19850690913 |
申请日期 |
1985.01.11 |
申请人 |
ROHM AND HAAS COMPANY |
发明人 |
BLANKENSHIP, ROBERT M.;KOWALSKI, ALEXANDER |
分类号 |
C09D5/02;C08F2/22;C08F265/02;C08F291/00;C08J3/12;C08J9/28;C09D5/00;C09D133/00;(IPC1-7):C08J9/28 |
主分类号 |
C09D5/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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