Thixotropic syrups containing polyamide-modified unsaturated polyesters and styrene

Claim 1

THE PROCESS OF MAKING A THIXOTROPIC UNSATURATED POLYESTER-STYRENE SYRUP CONSISTING OF (A) RAPID MIXING OF FROM ABOUT 30% TO ABOUT 60% BY WEIGHT OF STYRENE AT ABOUT ROOM TEMPERATURE WITH (B) FROM ABOUT 70% TO ABOUT 40% BY WIEGHT OF UNSATURATED POLYESTER-POLYAMIDE POLYMER AT A TEMPERATURE OF ABOUT 120*-165*C., (C) THE TEMPERATURE OF THE MIXTURE IMMEDIATELY AFTER ALL THE COMPONENTS ARE MIXED BEING 80* TO 95*C., (D) THE UNSATURATED POLYESTER BEING A POLYESTER COMPRISING THE REACTION PRODUCT OF AT LEAST ONE ALKYLENE GLYCOL WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF MALEIC ANHYDRIDE AN FUMARIC ACID, (E) THE POLYESTER HAVING BEEN REACHED WITH ABOUT 1-5% BY WEIGHT OF A POLYAMIDE WHEN THE ACID NUBMER OF THE POLYESTER WAS BELOW ABOUT 45 BY HEATING AT ABOUT 195*C. FOR ABOUT 5 MINUTES TO ABOUT 5 HOURS, AND (F) THE POLYAMIDE BEING A CRYSTALLINE, THERMOPLASTIC LINEAR POLYMER OF RELATIVELY HIGH MOLECULAR WEIGHT CONSISTING ESSENTIALLY OF THE REACTION PRODUCT OF ETHYLENE DIAMINE, AN ALIPHATIC SATURATED DIBASIC ACID HAVING ACHAIN OF AT LEAST ABOUT 8 METHYLENE GROUPS, AND A DIMER ACID, THE POLYAMIDE HAVING A SOFTENING POINT IN THE RANGE OF ABOUT 180-190*C., THE RELATIVE AMOUNTS OF AMINE AND ACIS VARYING SUFFICIENTLY FROM STOICHIOMETRIC PROPORTIONS TO YIELD A POLYAMIDE HAVING A COMBINED ACID AND AMINE NUMBER OF NOT OVER 20.