INORGANIC PARTICLES WITH IMPROVED FLOWABILITY

    公开(公告)号:US20170130056A1

    公开(公告)日:2017-05-11

    申请号:US15317987

    申请日:2014-07-04

    CPC classification number: C09C3/043 C08K9/08 C09C3/10 C09D7/61 C09D133/12

    Abstract: The present invention provides spray-dried powders comprising from 0.1% to 25% a hydrophobic polymer, from 75% to 99.9% inorganic particles, and less than 3% a dispersant. The Tg of the hydrophobic polymer is less than 105° C., the average particle size of the inorganic particles is from 5 nm to 100 um, and the average particle size of the spray-dried powders is from 1 um to 400 um. The hydrophobic polymer comprises, as polymerization units, an ethylenically unsaturated nonionic monomer. The present invention further provides a process for the preparation of the spray-dried powders comprising (a) preparing a solution comprising the hydrophobic polymer, the inorganic particles, and the dispersant; and (b) adding the solution into a spray dryer and preparing the spray-dried powders.

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