The invention provides an emulsion comprising an organopolysiloxane of the formula: R.sup.1.sub.x R.sup.2.sub.y R.sup.3.sub.z SiO.sub.(4-x-y-z)/2 wherein R.sup.1 is a monovalent C.sub.1-20 hydrocarbon group, R.sup.2 is as defined for R.sup.1 or OX wherein X is hydrogen or a monovalent C.sub.1-6 hydrocarbon group, R.sup.3 is --R.sup.4 COOH wherein R.sup.4 is a divalent C.sub.1-20 hydrocarbon group, 0