A water insoluble lipophilic emulsifier having a hydrophile-lipophile balance (HLB) of 3.5 to 7, added to an aqueous dispersion containing a polymer comprising acrylic acid, methacrylic acid, their alkyl esters, and/or their alkylaminoalkyl esters, acts as a lubricant and parting agent when the resulting mixture is used for coating pharmaceutical dosage forms and prevents the pharmaceutical dosage forms being coated from sticking to one another and to the walls of the coating apparatus used.