METHOD FOR PRODUCING POLYALKENYLIC DERIVATIVES OF UNSATURATED DICARBOXYLIC ACIDS

摘要

The invention provides a process for the preparation of a polyalkenyl derivative of a monoethylenically unsaturated C4-10 dicarboxylic acid material wherein the ratio of dicarboxylic acid moieties per polyalkenyl chain is less than 1.2:1, which comprises reacting a polyalkene having Mn in the range 950 to 5000 with a monoethylenically unsaturated C4-10 dicarboxylic acid material in mol ratio dicarboxylic acid material: polyalkene greater than 1:1 at a temperature in the range 150 to 260 DEG C in the presence of a polyaddition-inhibiting amount of a sulphonic acid.