首页> 外国专利> PROCESS FOR PREPARING CORE-SHELL PARTICLES SUITABLE AS OPACIFYING AGENTS IN COATING COMPOSITIONS: COATING COMPOSITIONS

PROCESS FOR PREPARING CORE-SHELL PARTICLES SUITABLE AS OPACIFYING AGENTS IN COATING COMPOSITIONS: COATING COMPOSITIONS

机译:制备适合用作涂料组合物中的试剂的核心-壳颗粒的方法:涂料组合物

摘要

An aqueous dispersion of water-insoluble core-shell particles is prepared by emulsion polymerization for use as an opacifying agent in coatings. The particles have interior cores which are swollen with nonaqueous solvent. The polymeric exterior shells have a glass transition temperature greater than about 50 DEG C in the presence of the nonaqueous solvent. The partition coefficient for the nonaqueous solvent between the interior core polymer phase and the exterior shell polymer phase is at least about 1.25. Coatings compositions formulated using the core-shell particles show increased opacity, as single light scattering microvoids are formed in individual particles when the solvent evaporates and the core collapses inside the rigid exterior shell. Opacity develops even when aqueous coatings containing the particles are dried under high humidity conditions.
机译:水不溶性核-壳颗粒的水分散体通过乳液聚合制备,用作涂料中的遮光剂。颗粒具有被非水溶剂溶胀的内芯。在非水溶剂的存在下,聚合物外壳的玻璃化转变温度大于约50℃。非水溶剂在内芯聚合物相和外壳聚合物相之间的分配系数至少为约1.25。使用核-壳颗粒配制的涂料组合物显示出增加的不透明性,因为当溶剂蒸发并且核在刚性外壳内塌陷时,单个颗粒中会形成单个光散射微孔。即使将含有颗粒的水性涂料在高湿度条件下干燥,也会产生不透明。

著录项

  • 公开/公告号NZ222376A

    专利类型

  • 公开/公告日1990-10-26

    原文格式PDF

  • 申请/专利权人 ROHM & HAAS CO;

    申请/专利号NZ19870222376

  • 申请日1987-10-30

  • 分类号C08F2/22;C08F2/24;C08F2/26;C08J9/28;B01J13/02;C09D7/12;

  • 国家 NZ

  • 入库时间 2022-08-22 06:18:00

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