Hydrophobicization of pyrogenic silica

Details Hydrophobicization of pyrogenic silica Hydrophobicization of pyrogenic silica

1994-08-08

1995-10-17

Beck, Shrive

Coating processes

Particles, flakes, or granules coated or encapsulated

Solid encapsulation process utilizing an emulsion or...

427215, 4273722, B05D 700

Patent

active

054589169

ABSTRACT:
A process for continuously rendering finely divided, pyrogenic silica hydrophobic at low temperatures in the presence of a hydrophobicizing aid such as aliphatic alcohols having from 1 to 3 carbon atoms. The process of rendering silica hydrophobic is conducted at temperatures of from 60.degree. to 350.degree. C., and more preferably from 80.degree. to 150.degree. C., over a period of from 2 to 5 hours, and more preferably from 3 to 4 hours. The hydrophobicizing agents are known organohalosilanes and the preferred hydrophobicizing aid is methanol. The hydrophobicizing aid is used in amounts of from 2% to 15% by weight, and more preferably in amounts of from 2% to 10% by weight, based on the weight of silica used.

REFERENCES:
patent: 3924029 (1975-12-01), Schutte et al.
patent: 4015031 (1977-03-01), Reinhardt et al.
Patent Abstract of Japan vol. 5, No. 62 (C-52), Apr. 25, 1981 & JP-A-56 014 414 (Tokuyama Soda Co.), Feb. 12, 1981.
Database WPI, Derwent Publications Ltd., London, GB, AN 68-16086Q & SU-A-203 207 (Dering et al.), Sep. 28, 1967.

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