Vesiculated silica microspheres containing inorganic pigment

Details Vesiculated silica microspheres containing inorganic pigment Vesiculated silica microspheres containing inorganic pigment

C - Chemistry, Metallurgy

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C

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C09C 1/28 (2006.01) B01J 13/02 (2006.01) C01B 33/16 (2006.01) C09C 1/00 (2006.01) C09C 1/02 (2006.01) C09C 1/30 (2006.01) C09D 7/00 (2006.01) D21H 17/68 (2006.01) D21H 21/54 (2006.01)

Patent

CA 1070182

ABSTRACT OF THE DISCLOSURE Pigmented vesiculated silica microspheres having an average diameter from 0.5 µ to 50 µ, a maximum vesicle diameter less than 50 µ and a volume of vesicles from 5% to 95% of the total volume of the microspheres, produced by acidifying an oil-in-water-in-oil emulsion prepared by a double emulsion technique. The vesiculated silica micro- spheres, containing clay, calcium carbonate, white lead, zinc oxide, zinc sulfide or titanium dioxide pigment, are particularly useful as opacifying agents for coating com- positions and as fillers for paper.

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