alkylene oxide with 2 4 carbon atoms to monohydric trihydric aliphatic alcohol with 4 26 carbon atoms and aliphatic carboxylic acid with 4 26 carbon atoms 2 poly etherester compounds obtainable by esterification of poly ether compound obtainable by adding alkylene oxide with 2 4 carbon atoms to monohydric trihydric aromatic alcohol and aliphatic carboxylic acid with 4 26 carbon atoms and 3 poly etherester compounds obtainable by esterification of poly ether compound obtainable by adding alkylene oxide with 2 4 carbon atoms to aliphatic alcohol with 4 26 carbon atoms and aromatic carboxylic acid examples of aforementioned mineral oil include mineral oils of various kinds having different viscosity values among these however those with viscosity 1 u00d7 10 u2212 6 1 3 u00d7 10 u2212 1 m 2 s at 30 u00b0 c are preferable and those with viscosity 1 u00d7 10 u2212 6 5 u00d7 10 m 2 s are even more preferable examples of such preferable mineral oil include fluid paraffin oil examples of aforementioned silicone oil include silicone oils of various kinds having different viscosity values among these however linear polyorganosiloxane with viscosity 1 u00d7 10 u2212 3 1 m 2 s at 30 u00b0 c is preferable examples of such linear polyorganosiloxane include linear.