| 摘要 |
In the present invention, finely divided silica is treated with two types of organosilican compounds, (i) organosilicon compound having the general formula <IMAGE> wherein R is a monovalent hydrocarbon group; n is an integer having a value of 0 to 10; and Q is an alkoxy group, halogen atom, or hydroxyl group, and (ii) organosilicon compound having the general formula (R3Si)a-Z wherein R is a monovalent hydrocarbon group; a is 1 or 2; when a equals 1, Z is a hydrogen atom, halogen atom, hydroxyl group, alkoxy group, -NR12, -ONR12, or -OCOR1; when a equals 2, Z is -O-or -NR1-; and R1 is the hydrogen atom or an alkyl group. The present invention characteristically affords a finely divided silica which has a high degree of surface treatment, which provides an elevated thixotropy when mixed with organopolysiloxane, and which provides stability in long-term storage.
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