Compositions: coating or plastic – Materials or ingredients – Miscellaneous
Patent
1975-11-03
1977-06-21
Douglas, Winston A.
Compositions: coating or plastic
Materials or ingredients
Miscellaneous
106288Q, 106288B, 106309, 427213, 427220, C09C 128
Patent
active
040309401
ABSTRACT:
A method of producing fine-disperse alkylated silica compounds, characterized in that starting fine-disperse silica is subjected to treatment with water vapors at a temperature of 110.degree.-120.degree. C to attain the humidification degree of from 2 to 40 micromoles H.sub.2 O/m.sup.2 SiO.sub.2, the thus humidified silica being then treated with vapors of alkylchlorosilane at a temperature of 250.degree. to 310.degree. C. The method of the invention allows controlling the concentration of grafted alkyl groups in the resultant product within the range of from 4.7 to 8.0 micromoles of grafted alkyl groups per m.sup.2 of the surface of SiO.sub.2. Starting silica can be modified with oxides of metals, such as aluminium, titanium, iron or zirconium oxides, the resultant products exhibiting good hydrophobic properties when used as thickeners for lubrication materials.
REFERENCES:
patent: 3873337 (1975-03-01), Laufer et al.
patent: 3920865 (1975-11-01), Laufer et al.
patent: 3924029 (1975-12-01), Schutte et al.
Chugai Alexei Dmitrievich
Chuiko Alexei Alexeevich
Galashina Malvina Leontievna
Khaber Nikolai Vasilievich
Khoma Mikhail Ivanovich
Douglas Winston A.
Howard J. V.
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