Patent ID: 7452941

Claim:
A process for preparing a surfactant comprising: reacting an α, β-unsaturated carboxylic acid or anhydride, or an ester thereof, with a resin comprising hydrocarbon monomeric residues, to provide an adduct; and reacting the adduct with either alkylene oxide or a carboxyl-reactive poly(alkylene oxide) to provide the surfactant, wherein the resin is selected from the group consisting of a terpene-phenol resin, a terpene-hydrocarbon resin, and a terpene-vinylaromatic resin wherein the resin comprises at least one residue selected from the group consisting of residues of α-pinene, β-pinene, limonene, dipentene, β-phellandrene, δ-3-carene, and δ-2-carene, wherein the resin further comprises at least one residue selected from the group consisting of residues of isobutylene, 1-alkene, 2-alkene, a trisubstituted alkene, and vinylcyclobexene.