| http://www.w3.org/ns/prov#value | - propylene group, x and y are each an integer of one or more, and an average value of x+y is 2 to 10; and a diol represented by the following structural formula (B): ##STR2## wherein R' represents --CH2 CH2 --, ##STR3## and polyhydric alcohols such as glycerol, sorbitol and sorbitan.
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