Organopolysiloxane and use thereof as surfactant, powder treatment agent, thickening agent of oil-based raw material or gelling agent. gel and emulsion compositions, as well as, preparations for external use and cosmetics comprising the same

A co-modified organopolysiloxane represented by general formula (1):

• R1aR2bL1cQdSiO(4−a−b−c−d)/2 (1)
• wherein
• each R1 independently represents a monovalent organic group, with the proviso that R2, L1 and Q are excluded therefrom;
• each R2 independently represents a substituted or non-substituted, and linear or branched monovalent hydrocarbon group having 9 to 30 carbon atoms, or a linear organosiloxane group represented by the general formula (2-1):
• wherein each R11 independently is a substituted or non-substituted monovalent hydrocarbon group having 1 to 30 carbon atoms, a hydroxyl group or a hydrogen atom, and at least one R11 is said monovalent hydrocarbon group;
• t is a number ranging from 2 to 10;
• and r is a number ranging from 1 to 500,
• or represented by general formula (2-2):
• wherein R11 and r are the same as defined above;
• each L1 independently represents a silylalkyl group having a siloxane dendron structure, in the case of i=1, represented by general formula (3):
• wherein
• each R3 independently represents a substituted or non-substituted, and linear or branched monovalent hydrocarbon group having 1 to 30 carbon atoms;
• each R4 independently represents an alkyl group having 1 to 6 carbon atoms or a phenyl group;
• Z represents a divalent organic group;
• i specifies a number of generations of said silylalkyl group, represented by Li, in the case in which a number of generations of said silylalkyl group, which is a number of repetitions of said silylalkyl group, is k, i is an integer ranging from 1 to k, and a number of generations k is an integer ranging from 1 to 10;
• Li+1 is said silylalkyl group in the case of i<k, and is any R4 in the case of i=k;
• and hi is a number ranging from 0 to 3;
• Q represents an organic group containing a sugar alcohol group;
• and
• each of a, b, c and d is independently a number having the following range:
• 1.0≦a≦2.5, 0≦b≦1.5, 0.0001≦c≦1.5, and 0.0001≦d≦1.5.