Process for hydrophobization of finely divided silica and silica

Details Process for hydrophobization of finely divided silica and silica Process for hydrophobization of finely divided silica and silica

1975-05-29

1978-02-07

Gwinnell, Harry J.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

427221, 260 4215, B32B 1700, C01B 3318

Patent

active

040727963

ABSTRACT:
Finely divided hydrophobic silica and silicates are prepared by precipitating of alkali silicate solutions with mineral acids or metal salt solutions and treated with organohalosilanes. To the acid precipitation suspension recovered in known manner there is added as a hydrophobizing agent an organohalosilane, preferably at about 50.degree. to 90.degree. C., the precipitated product filtered, washed and dried and there subjected to a temperature of 300.degree. to 400.degree. C. There is used as the organohalosilane a prepolycondensed organohalosilane or a mixture of prepolycondensed organohalosilanes.

REFERENCES:
patent: 2911324 (1959-11-01), Evans et al.
patent: 2993809 (1961-07-01), Bueche et al.
patent: 3252825 (1966-05-01), Marzocchi et al.
patent: 3859320 (1975-01-01), Atherton
patent: 3904787 (1975-09-01), Trebinger et al.
patent: 3920865 (1975-11-01), Laufer et al.

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