Process for hydrophobizing silicas and silicates with organosila

Details Process for hydrophobizing silicas and silicates with organosila Process for hydrophobizing silicas and silicates with organosila

1976-02-02

1977-03-29

ZHoffman, James R.

Coating processes

Particles, flakes, or granules coated or encapsulated

Solid encapsulation process utilizing an emulsion or...

427220, B05D 100, B05D 700

Patent

active

040150313

ABSTRACT:
Finely divided hydrophobic silica or silicate is produced by treating the dry, moving particles with an organic silane at elevated temperature. The silica or silicate which had been prepared by wet precipitation or pyrogenically and which is in powdered form is heated to a temperature of about 200.degree. to 300.degree. C. with agitation and is brought to a fluidized condition and then is treated dropwise with an organosilane which is stable and boils below 300.degree. C.

REFERENCES:
patent: 2993809 (1961-07-01), Bueche et al.
patent: 3012861 (1961-12-01), Ling
patent: 3600326 (1971-08-01), Wilcox et al.
patent: 3830738 (1974-08-01), Cottrell
patent: 3924029 (1975-12-01), Schutte et al.

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