Organic compounds -- part of the class 532-570 series – Organic compounds – Silicon containing
Patent
1979-01-24
1981-01-27
McCarthy, Helen M.
Organic compounds -- part of the class 532-570 series
Organic compounds
Silicon containing
556450, 556455, 106308Q, C07F 708
Patent
active
042477085
ABSTRACT:
A method for imparting a hydrophobic property to a fine oxide powder by treating it with an organo-polysiloxane in the presence of an alkali catalyst. The method is carried out with at least 1.5% by weight of organo-polysiloxane of molecular weight not exceeding 10,000, at least 0.5% by weight of ammonia or an aliphatic amine of a boiling point lower than 100.degree. C. and at least 1.5% by weight of water are added to a dry weight of the fine oxide powder (a quantity obtained after removal of adsorption water content under reduced pressure not exceeding 5 mmHg in mercury meter at 100.degree. to 110.degree. C.). Of these additives, the ammonia or the aliphatic amine of a boiling point not exceeding 100.degree. C. is added at a temperature not exceeding 60.degree. C. Then, after an aging process for at least 15 minutes, heating is carried out to a temperature between 60.degree. and 150.degree.0 C. for a period of at least 30 minutes. All processes are carried out under normal pressure.
REFERENCES:
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patent: 3334062 (1967-08-01), Brown et al.
patent: 3373138 (1968-03-01), Brown
patent: 3649588 (1972-03-01), Kennedy-Skipton
patent: 4101499 (1978-07-01), Herzig
patent: 4141751 (1979-02-01), Moreland
patent: 4147707 (1979-04-01), Alewelt et al.
patent: 4191587 (1980-03-01), Kratel et al.
Dow Corning Bulletin #22-203, Jun. 1972, "Information about Powder Treatments", (3 sheets).
Dow Corning Bulletin 03-023, Feb. 1967, "Dow Corning Z-6020 Silane", (2 sheets).
Fukuda Yutaka
Matsubara Kenichi
Tsutsumi Yukihiro
McCarthy Helen M.
Toyo Soda Manufacturing Co. Ltd.
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