PURPOSE: To prepare an anti-stick agent which prevents the adhesion of excessive resin to the lead wire, etc in the coating of a capacitor, etc. with an epoxy resin, by copolymerizing a perfluoroalkyl group-containing compound with an alkyl (meth) acrylate at a specific ratio.

CONSTITUTION: The objective agent is prepared by copolymerizing (A) a polymerizable compound having a 4W21C perfluoroalkyl group (e.g. the compound of formula) and (B) a 12W18C alkyl ester of (meth) acrylic acid at a weight ratio (A)/(B) of (90W40)/(10W60).

USE: The agent is dissolved in an organic solvent (e.g. methylchloroform) or dispersed in water at a concentration of pref. 0.5W1.5wt%, applied to a substrate to be treated, and dried to remove the solvent. The substrate is imparted with the desired anti- stick property.