| 摘要 |
PROBLEM TO BE SOLVED: To obtain an organopolysiloxane capable of imparting good yellowing resistance and excellent flexibility to fibers or fibers products when used as a surfactant, further capable of quickly giving an extremely good water-repelling effect, and useful for fiber-treating agent compositions or water-repelling agent compositions by specifying the viscosity of the organopolysiloxane. SOLUTION: This organopolysiloxane is expressed by formula I R1 is a (substituted) 1-20C monovalent organic group; R2 is a monovalent organic group of the formula; R4(NR5CH2CH2)aNR6R7 [R4 is a 1-6C divalent hydrocarbon; R5, R6 are each H or a 1-6C monovalent hydrocarbon; R7 is a group of formula II; R8 is a 2-10C divalent hydrocarbon; (a) is 0-4]; R3 is OH or the like; (m) is 10-1,000; (n) is 0-100}, and has a viscosity of 100-1,000,000 cS at 25 deg.C. The organopolysiloxane is obtained, for example, by addition-reacting an aminoalkyl- modified organopolysiloxane to a dicarboxylic acid anhydride such as maleic anhydride in the absence of solvent or in a solvent with stirring.
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