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    • 8. 发明专利
    • DE3765922D1
    • 1990-12-06
    • DE3765922
    • 1987-12-30
    • NIPPON OIL CO LTD
    • KINOSHITA HIROTUGOSEKIYA MAKOTOMISHIMA MASARU
    • C10M115/08
    • A urea-urethane grease composition contains, as essential ingredients, a thickener and a lubricant base oil. The thickener contains a urea-urethane mixture having a composition including 20 to 99, mol.% of a diurea compound represented by the general formula (I) of R2-NH @NH-R1-NH @NH-R2 4 to 30 mol.% of a urea-urethane compound represented by the general formula (II) of R2-NH @NH-R1-NH @-O-R3 and 1 to 50 mol.% of a diurethane compound represented by the general formula (III) of R3-O- @NH-R1-NH @-O-R3 wherein R1 represents a difunctional aromatic hydrocarbon residue having 6 to 15 carbon atoms, R2 a cyclohexyl group or a group derived from cyclohexyl and having 7 to 12 carbon atoms and R3 an alkyl group or an alkenyl group having 8 to 20 carbon atoms. The ratio of the numbers of amino groups R2-NH- to those of alkoxy groups R3-O- in the mixture being 95/5 to 40/60. The thickener is contained in an amount of 2 to 25 wt.% based on the total weight of the grease composition.