more), fatty acid esters (e.g., methyl esters of saturated fatty acids obtained from a saturated fatty acid having a carbon number of 20 or more and a lower alcohol such as methyl alcohol), fatty acid amides (e.g., primary amides of a saturated fatty acid having a carbon number of 10 or less and unsaturated fatty acid amides such as oleic acid amide and erucic acid amide), fatty acid amines (e.g.,