ACCUMULATED EPOXIDIC COATINGS LIKE FILMS, CONTROLLED, APPLIED BY A CATHODIC ELECTROPOSITION.

摘要

A MIXTURE OF (I) AN ADVANCED EPOXY BASED CATION RESIN PREPARED BY REACTING IN THE PRESENCE OF A PROPER CATALYST (A) A COMPOSITION THAT INCLUDES (1) BETWEEN 20 AND 100% BY WEIGHT OF A DIGLICIDILIC ETHER OF A POLYOL AND (2) BETWEEN 0 AND 80% BY WEIGHT OF A DIGLICIDILIC ETHER OF A DIHYDRIC PHENOL WITH (B), AT LEAST ONE DIHYDRIC PHENOL AND OPTIONALLY, (C) A SINGLE-FUNCTIONAL CHAIN-TERMINATING AGENT; WHERE COMPONENTS (A) AND (B) ARE USED IN QUANTITIES SUCH THAT THE RESULTING ADVANCED EPOXY RESIN HAS AN AVERAGE EPOXY EQUIVALENT WEIGHT BETWEEN 350 AND 10,000 OF WHICH AN ADVANCED SEVERE AND OXYRENE TERMINAL GROUPS IS FORMED LESS SOME OF THE OXIRANO GROUPS IN CATIONIC GROUPS; AND (II) AN EPOXY BASED CATHODIC CATIONIC ELECTRODEPOSITION RESIN. SUCH RESIN MIXTURES CAN BE USED IN CATHODIC ELECTRO-DEPOSITION COATING SYSTEMS. THESE RESIN MIXTURES PROVIDE LOW VISCOSITY COATING COMPOSITIONS AND PRODUCE ELECTROPOSITION COATINGS WITH FILM FORMATION PROPERTIES SUPERIOR TO THOSE OF COMPOSITIONS THAT DO NOT CONTAIN THE COMPONENT (I).