| 摘要 |
Liquid organosiloxane MTQ resins of the general formula ¢Mx T y Q z!n wherein M denotes a monofunctional, T a trifunctional and Q a tetrafunctional siloxane unit, n has an average value of from 4 to 14, x+y is not less than z and not more than 2 z and x/y has a value of from 2 to 9,are prepared by a method comprising (I) adding together (A) a silane of the general formula SiZ4, (B) a silane of the general formula RSiY3 and (C) a silane of the formula R3SiX or (C') a disiloxane of the formula (R3Si)2O in an acidic aqueous medium,and (II) allowing Components (A), (B) and (C) or (C') to react together. X denotes a halogen or alkoxy group, Y denotes X or -OSiR'3, Z denotes an alkoxy group and Component (A) is not added to the aqueous medium prior to Components (B) and (C) or (C').
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