Polysiloxane compounds (I), are new. Polysiloxane compounds (I) of formula ([MD n] 3T), are new. M : XSiY 1>; 2O 1 / 2; D : SiY 1>; 2O 2 / 2; T : SiZO 3 / 2; X : an organic residue carrying same or different ammonium functional group; Y 1>;, Z : 1-30C alkyl, 1-30C aryl or 1-30C alkylaryl; and n : 2-200. An independent claim is included for the preparation of (I).