ANTIBLOCKING AGENT FOR RUBBER

PURPOSE:An antiblocking agent, consisting of a water dispersible material having film-forming properties, anionic and/or nonionic surfactant and capable of improving the adhesion preventing properties by forming a thin film of the water dispersible material on an unvulcanized rubber without inhibiting the vulcanizing and bonding. CONSTITUTION:An antiblocking agent for rubber consisting of (A) 50-98pts.wt., preferably 60-95pts.wt., expressed in terms of solid, water dispersible material, consisting of one or more selected from colloidal silica, colloidal aluminum hydroxyde, acrylic resin emulsion, etc., and (B) 2-50pts.wt., preferably 5-40pts. wt. anionic surfactant, e.g. fatty acid salt, alkyl suflate, etc., and/or nonionic surfactant having 3-16 HLB, e.g. polyoxyethylene alkyl ether, sorbitan ester of a fatty acid, etc. An aqueous solution of the above-mentioned antiblocking agent is applied to the surface of an unvulcanized rubber and dried to produce adhesion preventing effect.