CALIXARENES AND THEIR USE AS LUBRICANT ADDITIVES

摘要

A cyclic compound comprising m units of formula (Ia) and n units of formula (Ib) joined together to form a ring, wherein Y and Y<2> are divalent bridging groups which may be the same or different in each unit; R<0> is H or (C1-C6) alkyl or is a metal or ammonium cation; R<5> is H or (C1-C60) alkyl or OH group; j is 1 or 2; R<3> is hydrogen, a hydrocarbyl or a hetero-substituted hydrocarbyl group; each of R<1>, R<2> and R<4>, which may be the same or different, is hydroxyl, hydrogen, hydrocarbyl or hetero-substituted hydrocarbyl, with the provisos that i) at least one of R<1>, R<2>, R<4> is hydroxyl, and m + n is 4 to 20, m is 1-8 and n is at least 3, and ii) in formula Ia at least one OH group is in the meta or para position to the COOR<0> group and/or at least one R<5> group is OH.