Process for extrusion of plasticized PVB film with reduced plate-out of adhesion control agent residues

A process for minimizing extruder deposits in the extrusion of a mixture comprising at least one polyvinyl acetal, at least one plasticizer, and at least one alkaline earth metal salt of a carboxylic acid, comprising:

• adding, in its acid form, 0.001-1 wt. % of at least one carboxylic acid having 4 to 30 carbon atoms to the mixture prior to or during extrusion, wherein the wt. % is based on a combined weight of polyvinyl acetal resin and plasticizer, and extruding to form a plasticized polyvinyl acetal film.