Patent ID: 8133922

Claim:
A nonionic surfactant composition, comprising: 70 to 95 percent by weight of a polyglycerol alkyl ether nonionic surfactant, wherein the polyglycerol monoalkyl ether is a polyglycerol monoalkyl ether of following formula (1): wherein: R represents a branched-chain aliphatic hydrocarbon group having from 14 to 22 carbon atoms; “n” denotes an average number of repeating glycerol units ranging from 2 to 10; and repeating unit C 3 H 6 O 2 in the parentheses have both structures of following formulae (2) and (3): —CH 2 —CHOH—CH 2 O— (2) —CH(CH 2 OH)CH 2 O— (3); and 5 to 30 percent by weight of water, wherein the polyglycerol alkyl ether nonionic surfactant comprises one or more polyglycerol alkyl ethers, and wherein the nonionic surfactant has a polyglycerol monoalkyl ether content of 75 percent by weight or more and a polyglycerol dialkyl ether content of 5 percent by weight or less.