| abstract |
A grease composition comprising a particulate hydrotalcite type compound represented by the formula (I) : [M 2+ 1-xM 3+ x (OH) 2] [ (A n- ) x/n • mH20] (where M 2+ is a divalent metal ion, M 3+ is a trivalent metal ion, A n- is an anion of valency n, x is a number which satisfies 0 < x < 1, and m is a number equal to 0 or above), or a derivative thereof. Thegrease composition is outstanding both in terms of the main characteristics of the grease (worked penetration value, heat resistance, oxidation stability, etc.) and also in its environmental compatibility. |