PRODUCTION OF POLYORGANOSILOXNE COMPOUND

PROBLEM TO BE SOLVED: To obtain the subject compound with controlled molecular structure and molecular weight by reaction between an organotrichlorosilane and a compound having one active hydrogen in the molecule followed by hydrolysis and condensation reaction. SOLUTION: This polyorganosiloxane compound is obtained by reaction between an organotrichlorosilane of formula I (R1 is a 1-18C saturated hydrocarbon, 2-6C unsaturated hydrocarbon, 8-14C radical-polymerizable aromatic hydrocarbon, or the like) and a compound having one active hydrogen in the molecule (pref. a 1-4C alcohol, acrylic acid, methacrylic acid or acetic acid) followed by adding water to the reaction system to carry out hydrolysis and condensation reaction. The polyorganosiloxane compound thus obtained has recurring unit of formula II (R2 is a 1-4C saturated hydrocarbon, CH3CO, CH2=CHCO, or the like; (n) 0.1-2.0) and a number-average molecular weight MN calculated as polystyrene and satisfying formula III (K satisfies the relationship: 0