Abstract:
1. A THICKENING AGENT FOR UNSATURATED POLYESTER RESINS, SAID THICKENING AGENT COMPRISING A COLLOIDAL MIXTURE OF (A) FOM 10 TO 80% BY WEIGHT OF AN INORGANIC THICKENER SELECTED FROM THE GROUP CONSISTING OF OXIDES AND HYDROXIDES OF THE ELEMENTS OF THE SECOND AND THIRD GROUPS OF THE PERIODIC TABLE AND (B) FROM 90 TO 20% BY WEIGHT OF APOLYESTER CONSISTONG OF THE CONDENSATION PRODUCT OF AT LEAST ONE DICARBOXYLIC ACID, AT LEAST ONE MONOCARBOXYLIC ACID, UP TO 10% BY WEIGHT, BASED ON THE WEIGHT OF DICARBOXYLIC ACID, OF AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF TRICARBOXYLIC ACIDS AND TETRACARBOXYLIC ACIDS, AND AT LEAST ONE GLYCOL, SAID POLYESTER HAVING AN ACID NUMBER OF FROM 5 TO 50 AND A HYDROXYL NUMBER OF FROM 100 TO 300.