The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 21, 1977
Filed:
Nov. 03, 1975
Alexei Alexeevich Chuiko, Kiev, SU;
Valentin Anatolievich Tertykh, Kiev, SU;
Vilyam Alexandrovich Sobolev, Kiev, SU;
Valery Mikhailovich Maschenko, Kiev, SU;
Vyacheslav Valentinovich Pavlov, Kiev, SU;
Alexei Dmitrievich Chugai, Kiev, SU;
Nikolai Vasilievich Khaber, Kalush, Ivano-Frankovskoi oblasti, SU;
Anatoly Borisovich Kondratenko, Kalush, Ivano-Frankovskoi oblasti, SU;
Vasily Ivanovich Vatamanjuk, Ivano-Frankovsk, SU;
Mikhail Ivanovich Khoma, Kalush, Ivano-Frankovskoi oblasti, SU;
Alexandr Nikolaevich Kutin, Moscow, SU;
Jury Davydovich Shaposhnikov, Moscow, SU;
Malvina Leontievna Galashina, Moscow, SU;
Other;
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.