Abstract: A novel opacifying composition for use with alkaline paper which does not react with alkyl succinic anhydride, is provided. The opacifier comprises a mixture of an aromatic polymer, preferably a styrene acrylic polymer, and a stearamide which preferably comprises either a mono-stearamide or a di-stearamide of amino ethyl ethanol amine or both a mono-stearamide or a di-stearamide of amino ethyl ethanol amine. The opacifying composition comprises the opacifier and water. The water is preferably present in an effective amount to provide the opacifying composition in a liquid, emulsion form. Preferably the opacifier comprises from 5% to 60%, more preferably from 15% to 50% , most preferably from 30% to 40% aromatic polymer and preferably from 40% to 95%, more preferably from 50% to 85%, most preferably from 60% to 70% of the stearamide. A base is preferably present in an effective amount to provide the opacifying composition with a pH of from 7.5 to 11.0.

Abstract: A novel method of opacifying paper, and a novel opacifier and opacifying composition which opacify as well as brighten paper, is provided. The novel opacifier comprises at least one diglyceride and at least one amino-ester compound. The opacifying composition comprises: solids and preferably water. The solids comprise opacifier and surfactant. Preferably, the opacifying composition is an emulsion of the solids in water.