| abstract |
Liquid organosiloxane MTQ resins of the general formula [M x TyQ 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 SiZ 4 , (B) a silane of the general formula RSiY 3 and (C) a silane of the formula R 3 SiX or (C') a disiloxane of the formula (R 3 Si) 2 0 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 I Components (B) and (C) or (C |