Process of preparing an organopolysiloxane modified polyester resin, the product thereof, and electrical conductor coated therewith

Claim 1

A PROCESS FOR PREPARING A RESINOUS COMPOSITION CONSISTING OF, (1) ADMIXING ONLY A POLYHYDRIC ALCOHOL WITH AN ACID SELECTED FROM THE GROUP CONSISTING OF ISOPHTHALIC ACID, TEREPHTHALIC ACID, AND METHYL ESTERS OF TEREPHTHALIC ACID, THE ALCOHOLIC AND ACIDIC COMPONENTS BEING EMPLOYED IN AMOUNT SUFFICIENT TO PROVIDE AT LEAST TWO ALCOHOLIC HYDROXYL GROUPS FOR EACH ACIDIC CARBOXYL GROUP, (2) HEATING THE MIXTURE TO A TEMPERATURE OF FROM 200*C TO 210*C. FOR A PERIOD OF TIME SUFFICIENT TO PRODUCE A RESINOUS POLYESTER FREE FROM OIL MODIFICATION HAVING AN ACID NUMBER OF FROM 23 TO 27 WHEREBY THE POLYESTER IS PREVENTED FROM GELLING, (3) REMOVING WATER OF ESTERIFICATION FORMED DURING THE REACTION, (4) COOLING THE RESINOUS POLYESTER TO 150*C., (5) ADMIXING WITH THE POLYESTER AN ORGANOPOLYSILOXANE HAVING AN AVERAGE OF FROM 2.5 TO 3.5 CULE, THE SILOXANE HAVING AN AVERAGE OF FROM 2.5 TO 3.5 HYDROXYLZABLE HYDROCARBONOXY GROUPS ATTACHED TO SILICON, THE REMAINING VALENCES OF SILICON OTHER THAN THOSE SATISFIED BY OXYGEN BEING SATISFIED WITH HYDROCARBON GROUPS, THE POLYESTER RESIN BEING PRESENT IN AN AMOUNT SUFFICIENT TO PROVIDE AT LEAST ONE HYDROXY GROUP FOR EACH HYDROLYZABLE HYDROCARBONOXY GROUP ON THE SILOXANE, AND (6) HEATING THE RESULTANT POLYERSTER-ORGANOPOLYSILOXANE MIXTURE AT A TEMPERATURE OF FROM 130*C. TO 200*C.