Patent ID: 8784787

Claim:
A co-modified organopolysiloxane having a group with a siloxane dendron structure and a hydrophilic group, expressed by the following general formula (1); General Formula (1): R 1 a L 1 b Q c SiO (4−a−b−c)/2 (1) wherein, R 1 is a monovalent organic group with the exception of groups corresponding to L 1 or Q, or a hydrogen atom; L 1 is a silylalkyl group having a siloxane dendron structure expressed by the following general formula (2) when i=1; wherein, R 1 is synonymous with the group described above, R 2 is a phenyl group or an alkyl group having from 1 to 6 carbons, and Z is a divalent organic group; i represents a generation of the silylalkyl group represented by L i , and is an integer of 1 to c when c is a number of generations that is a number of repetitions of the silylalkyl group, the number of generations c is an integer from 1 to 10, and L i+1 is the silylalkyl group when i is less than c and is a methyl group or a phenyl group when i=c; a i is a number in a range of 0 to 3; Q is a hydrophilic group derived from a hydrophilic compound selected from polyhydric alcohols comprising glycerin or polyglycerines, said hydrophilic group bonded to the silicon atom via a linking group that is at least divalent, and comprises at least one hydrophilic unit selected from hydrophilic units expressed by the following structural formulae (3-2) to (3-4): wherein W is a hydrogen atom or an alkyl group having from 1 to 20 carbons; wherein W is synonymous with the group described above; and wherein a, b, and c are in a range so that 1.0≦a≦2.5, 0.001≦b≦1.5, and 0.001≦c≦1.5.