| 摘要 |
PROBLEM TO BE SOLVED: To provide a particle suitably used in an aqueous composition and exhibiting binding functionality and opacity of useful level in a dry composition. SOLUTION: A polymeric particle including a core, a first shell, and a second shell is provided: the core including, when dry, at least one void; the first shell polymer having a calculated glass transition temperature (Tg) greater than 50°C and including, as polymerized units, from 15 wt.% to 60 wt.%, based on the weight of the first shell, monomer selected from the group consisting of acrylonitrile, methacrylonitrile, acrylamide, methacrylamide, and mixtures thereof; and from 0.3 wt.% to 10 wt.%, based on the weight of the first shell polymer, multiethylenically unsaturated monomer; and the second shell polymer having a Tg of from -60°C to 50°C; wherein the weight ratio of the second shell polymer to the total of all other structures of the polymeric particle is from 0.5:1 to 3:1. The particle provides binding functionality and, when dry, opacity and energy savings. A method for providing a polymeric particle and a method for providing opacity to a dry coating are also provided. COPYRIGHT: (C)2010,JPO&INPIT
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