OXIRANE-CONTAINING EPOXY RESINS MAY BE CURED BY REACTING THE EPOXY RESINS, OPTIONALLY IN MTHE PRESENCE OF HEAT AND/OR A SMALL AMOUNT OF A TERTIARY AMINE CATALYST, WITH THE VISCOUS ANHYDRIDE RESIDUE OBTAINED BY THE REACTION OF TETRAPROPYLENE WITH MALEIC ANHYDRIDE AFTER SUBSTANTIALLY COMPLETE REMOVAL OF UNREACTED SUBSTRATE AND DODECENYLSUCCINIC ANHYDRIDE FROM THE REACTION MIXTURE.