Vinyl polymer powder, thermoplastic resin composition, and molded body thereof
AssigneeMitsubishi Chemical Corporation
InventorsMasahiro UEDA, Shinji MATSUOKA
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Abstract
This vinyl polymer powder, which contains a vinyl polymer, has a glass transition temperature of at least 0° C. (where if there are a plurality of glass transition points, all of the glass transition temperatures are at least 0° C.), has no greater than 350 ppm of the total content of magnesium ions, calcium ions, aluminum ions, barium ions, and zinc ions, has no greater than 100 ppm of the content of ammonium ions, has an acid number of no greater than 2.5 mgKOH/g, and has a bulk density of 0.10-0.60 g/cm3.
Claims9
1-11. (canceled)
A method for producing a vinyl polymer powder, the method comprising the following Step (1) and Step (2):
- Step (1):
- a step of obtaining a vinyl polymer latex having a glass transition temperature of 0° C. or higher (provided that, when there are a plurality of glass transition points, all of the glass transition temperatures are 0° C. or higher) by subjecting a vinyl monomer to emulsion polymerization in the presence of a non-ionic/anionic emulsifier;
- and
- Step (2):
- a step of preparing a slurry having a pH of 6 or less by coagulating the vinyl polymer latex, then generating a precipitate, and recovering the precipitate as a vinyl polymer powder.
Dependencies are inferred from the claim text.