Patent ID: 8034891

Claim:
A polyether-modified organopolysiloxane represented by the average unit formula (1) R 1 a R 2 b SiO (4-a-b)/2 (1) {in the formula, R 1 is selected from the group consisting of a monovalent hydrocarbyl group that does not contain an aliphatically unsaturated bond, a monovalent fluorohydrocarbyl group that does not contain an aliphatically unsaturated bond, and an organic group represented by general formula (2) —R 3 (—O—Z m —Y) p (2) [in the formula, R 3 is a (p+1)-valent hydrocarbyl group having 2 to 20 carbon atoms that does not contain an aliphatically unsaturated bond or is a group comprising said hydrocarbyl group having an ether linkage (C—O—C) therein, Z is an alkyleneoxy group, m is 0-200, Y is hydrogen atom or is a group selected from the group consisting of a monovalent hydrocarbyl group that contains no more than 20 carbon atoms and that does not contain an aliphatically unsaturated bond, an acyl group that contains no more than 20 carbon atoms and that does not contain an aliphatically unsaturated bond, and a glycidyl group, and p is an integer from 1 to 6] wherein at least 80 mol % of R 1 in the molecule is a monovalent hydrocarbyl group that does not contain an aliphatically unsaturated bond; R 2 is an organic group represented by general formula (3) —R 3 (—O—X n —Z m —Y) p (3) [in the formula, R 3 is a (p+1)-valent hydrocarbyl group having 2 to 20 carbon atoms that does not contain an aliphatically unsaturated bond or is a group comprising said hydrocarbyl group having an ether linkage (C—O—C) therein, Z is an alkyleneoxy group, n is 1-200, m is 0-200, n and m satisfy 0.5<n/(n+m)≦1, Y is a hydrogen atom or is a group selected from a monovalent hydrocarbyl group that contains no more than 20 carbon atoms and that does not contain an aliphatically unsaturated bond, an acyl group that contains no more than 20 carbon atoms and that does not contain an aliphatically unsaturated bond, and a glycidyl group, p is an integer from 1 to 6, X is a divalent group represented by general formula (4) or general formula (5) (in the preceding formulas, W is a monovalent hydrocarbyl group that does not contain an aliphatically unsaturated bond or is a monovalent fluorohydrocarbyl group that does not contain an aliphatically unsaturated bond), wherein the configuration of the X and Z groups may be random, block, alternating, or a combination of the preceding]; a has an average value of 1.0≦a≦2.5; b has an average value of 0.001≦b≦1.5; and a and b satisfy an average of 1.001≦a+b≦3.0}.