COMPOSITIONS FOR COATING SHEET MATERIALS

摘要

A method of treatment and use of an aqueous coating composition which includes the steps of (a) concentrating the composition to increase the solids content thereof and (b) employing the concentrated composition to coat a sheet material, e.g. paper, wherein the concentration step (a) is carried out by use of thermal evaporation under reduced pressure. The composition concentrated may be a previously employed coating composition which has been recovered or it may be a fresh coating composition.