nic acids, heteropolyacids, Lewis acids, and mineral acids, (A) at least one olefinic compound containing at least one group of the formula (B) at least one carboxylic reactant selected from the group consisting of compounds of the formula wherein each of R 3 , R 5 and one R 9 is independently H or a hydrocarbyl group and the other R is a hydrocarbyl group, R is a divalent hydrocarbylene group, an