It is an object of the present invention to provide a dimer diol derivative and a composition containing the dimer diol derivative which have an excellent water-holding property, an excellent pigment dispersion property and further a high level of safety.The dimer diol derivatives according to the present invention is a dimer diol derivative represented by the following chemical formula 19.

(wherein R is a dimer diol residue, X is hydrogen atoms, the following chemical formula 20 or the following chemical formula 21, and Y is hydrogen atoms, the following chemical formula 20 or the following chemical formula 21 (except that a case where both X and Y are hydrogen atoms), 

(wherein R.sub.1 is an aliphatic hydrocarbon group having 1 to 22 carbon atoms, Z is the following chemical formula 22 and/or the following chemical formula 23, and n is an integer including zero), 

(wherein R.sub.1 is an aliphatic hydrocarbon group having 1 to 22 carbon atoms, Z is the following chemical formula 22 and/or the following chemical formula 23, and n is an integer including zero), 

(wherein R.sub.1 is an aliphatic hydrocarbon group having 1 to 22 carbon atoms),

(wherein R.sub.1 is an aliphatic hydrocarbon group having 1 to 22 carbon atoms).

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