THERE IS PROVIDED AN ORGANOPOLYSILOXANE WHICH IS EXCELLENT IN EXTENSIBILITY AS WELL AS SOLUBILITY AND DISPERSIBILITY IN WATER AND LOWER ALCOHOLS. THERE IS PROVIDED AN ORGANOPOLYSILOXANE WITH A POLY(N-ACYLALKYLENEIMINE)SEGMENT HAVING A REPEATING UNIT REPRESENTED BY THE FOLLOWING GENERAL FORMULA (1) : WHEREIN R1 REPRESENTS A HYDROGEN ATOM OR AN ALKYL GROUP, AN ARALKYL GROUP, OR AN ARYL GROUP EACH HAVING 1 TO 22 CARBON ATOMS AND N IS 2 OR 3, WHEREIN THE SEGMENT IS BOUND TO EACH OF AT LEAST TWO SILICON ATOMS OF AN ORGANOPOLYSILOXANE SEGMENT AS A MAIN CHAIN VIA AN ALKYLENE GROUP CONTAINING A HETERO ATOM, AND WHEREIN THE NUMBER-AVERAGE MOLECULAR WEIGHT OF THE SEGMENT IS 800 TO 1600, THE MASS RATIO OF THE ORGANOPOLYSILOXANE SEGMENT AS A MAIN CHAIN AND THE POLY(N-ACYLALKYLENEIMINE) SEGMENT IS 65/35 TO 82/18, AND THE WEIGHT-AVERAGE MOLECULAR WEIGHT OF THE ORGANOPOLYSILOXANE SEGMENT AS A MAIN CHAIN IS 10,000 TO 100,000.
