ADDITION OF HYDROCARBON RESINS OF DIFFERENT NATURE TO SOLVENT BASED POLYCHLOROPRENE ADHESIVES

The aliphatic-aromatic character of hydrocarbon resins affects the wet tability and the glass transition temperature (T-g) of polychloroprene (PCP) adhesives, the aromatic resins providing improved properties. A relationship between T-g und softening point of hydrocarbon resins ha s been found. Addition of hydrocarbon resins to polychloroprene adhesi ves (PCP) slightly reduced their viscosity. T-peel strength of styrene -butadiene rubber/PCP adhesive joints increased when aromatic hydrocar bon resins were added in the adhesive. A compatibility between aromati c hydrocarbon resin and polychloroprene existed, whereas for aliphatic hydrocarbon resins two non-miscible phases (polychloroprene and resin ) were formed; such incompatibility justified the poor properties of P CP adhesives containing aliphatic resins.