Opacifying additive
AssigneeWacker Chemical Corporation
InventorRichard Henry Bott
Life of this patent
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Abstract
A powdery opacifying additive, comprising a polymer of one or more monomers from the group comprising vinyl esters, (meth)acrylic esters, vinylaromatics, olefins, 1,3 dienes and vinyl halides and, if appropriate, further monomers which are copolymerizable therewith, in the form of agglomerated polymer particles with included air-voids, having a volume mean particle size dv of 20 to 80 μm.
Claims10
A coating composition, comprising a polymer dispersion, a pigment, and a filler and comprising a powdery opacifying additive in an amount of 1 to 30% by weight, based on the dry weight of the polymer applied with the polymer dispersion, wherein the powdery opacifying additive comprises
- a polymer of one or more monomers selected from the group consisting of vinyl esters, (meth)acrylic esters, vinylaromatics, olefins, 1,3 dienes and vinyl halides and, if appropriate, further monomers which are copolymerizable therewith, in the form of agglomerated polymer particles with included air-voids, having a volume mean particle size dv of 20 to 80 μm.
Dependencies are inferred from the claim text.