<p>Carbosiloxane dendrimers and a method for preparing them are new. The dendrimers contain a siloxane core and silylalkyl groups Carbosiloxane dendrimers containing at least one siloxane unit with general formula (I) and at least one siloxy group of formula (II) are new. X<1>R<1>aSiO(3-a)/2 (I) R<1> = 1-10C alkyl or aryl; a = 0-2; X<1> = a silylalkyl group of formula (III) at i = 1; R<2> = 2-10C alkylene; R<3> = 1-10C alkyl; Xi+1 = the above-defined silylalkyl group at i = i + 1 or optionally substituted hydrocarbyl; i = 1-10; bi = 0-3 provided that b<1> in at least one X<1> in each molecule is 0-2; R<4> = optionally substituted hydrocarbyl. An Independent claim is included for a process for preparing carbosiloxane dendrimers.</p>
