Preparation of alkyd resins involving the acidolysis of triglyceride oils, isophthalic and terephthalic acids

Claim 1

PROCESS FOR THE PREPARATION OF AN OIL-MODIFIED ALKYD RESIN WHICH COMPRISES HEATING TO A TEMPERATURE WITHIN ABOUT THE RANGE 500* F. TO 535* F. A MIXTURE OF TRIGLYCERIDE AND A PHTHALIC ACID IN WHICH THE CARBOXYL GROUPS ARE SEPARATED FROM EACH OTHER BY AT LEAST THREE CARBON ATOMS, THEN ADDING SLOWLY AND CONTINUOUSLY A SATURATED ALIPHATIC POLYHYDRIC ALCOHOL TO THE MIXTURE AND HEATING THE MIXTURE THROUGHOUT THE ADDITION OF THE POLYHYDRIC ALCOHOL TO MAINTAIN THE MIXTURE AT A TEMPERATURE WITHIN THE ABOVE-SPECIFIED RANGE, WHEREBY INCOMPATIBLE GEL FORMATION IS AVOIDED, AND THEN CONTINUING HEATING TO EFFECT ESTERIFICATION AND TO PRODUCE A RESIN OF ACID NUMBER BELOW 25, THE POLYHYDRIC ALCOHOL BEING EMPLOYED IN AN AMOUNT SUFFICIENT TO REACT WITH ALL THE CARBOXYL GROUPS UP TO 25% STOICHIOMETRIC EXCESS OVER THE PHTHALIC ACID, AND THE GLYCERIDE BEING PRESENT IN AN AMOUNT WITHIN THE RANGE OF 20% TO 90%, BASED ON TOTAL RESIN WEIGHT.