Surface-Active Polymer and Its Use in a Water-in-Oil Emulsion

摘要

The present invention relates to a succinic diester polymer which is used in the preparation of water-in-oil macroemulsions. Said polymer, which has an excellent ability to stabilize a water-in-oil macroemulsion, has the formula (I) wherein L is a polyalkenyl group having a number average molecular weight of from 600 to 1,500, A1 and A2 independently are poly(alkyleneoxy) chains with a molecular weight of from 500 to 1,200, where each alkyleneoxy group contains 2 or 3 carbon atoms and the number of alkyleneoxy groups being ethyleneoxy groups is at least 50% of the total number of alkyleneoxy groups, and R1 and R2 independently are alkyl groups having of from 1 to 3 carbons atoms. The succinic diester polymer may also be combined with one or more surfactants having a hydrocarbon group or acyl group of 8-22 carbon atoms, which surfactants are selected from the group consisting of alkoxylated alcohols, alkoxylated amines, amine oxides containing alkyleneoxy groups, alkoxylated esters, alkoxylated acids, alkoxylated amides, sugar surfactants, and compounds of the formula: R³O-C(O)-R⁴-C(O)-N(R¹)-(CH₂)_n-NH-C(O)-R² (II) wherein R¹ and R² are independently selected from C₈-C₂₂ alkyl/alkenyl groups, R³ is a hydrogen or a C₁-C₅ alkyl group, R₄ is a C₁-C₅ alkylene or alkenylene group, and n is an integer of from 2-5, with the weight ratio between succinic diester polymer and surfactant being 1:9 to 9:1. The emulsions of the invention can be used as a diesel fuel, a gasoline fuel, a heating fuel, a dry cleaning liquid, a metalworking fluid or a personal care formulation.