| http://www.w3.org/ns/prov#value | - Examples of the polyoles with valence 3-6, which may serve as a material for the partial ester for the aforementioned non-ionic surfactant for the method of production according to this invention, include (1) polyhydric alcohols such as glycerol, pentaerythritol, sorbitol and glucose; (2) cyclic ethers of polyhydric alcohol obtained by dehydration of sorbitol such as sorbitan and sorbide; (3) (pol
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