Silicone-polyester compositions and process for preparing same

Claim 1

THE PROCESS OF MAKING A HOMOGENEOUS SILICONEPOLYESTER COPOLYMER COMPOSITION WHICH COMPRISES HEATING AT A TEMPERATURE IN THE RANGE OF FROM 150*C. TO 250*C. UNDER ATMOSPHERIC CONDITIONS, A REACTION MIXTURE OF (1) AN ALIPHATIC ESTER AND ALCOHOL-CONTAINING SOLUTION OF THE HYDROLYSIS PRODUCT OF A MIXTURE OF ORGANOCHLOROSILANES HAVING FROM ABOUT 1 TO 1.75 ORGANIC GROUP PER SILICON ATOM SELECTED FROM THE CLASS CONSISTING OF LOWER ALKYL GROUPS, ARYL GROUPS, HALOGENATED ARYL GROUPS AND MIXTURES THEREOF, AND (2) A POLYESTER MATERIAL COMPRISING THE REACTION PRODUCT OF (A) FROM 25 TO 60 EQUIVALENT PERCENT OF A LOWER DIALKYL ESTER OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF ISOPHTHALIC ACID, TEREPHTHALIC ACID AND MIXTURES THEREOF, (B) FROM 10 TO 50 EQUIVALENT PERCENT OF ETHYLENE GLYCOL AND (C) FROM 20 TO 60 EQUIVALENT PERCENT OF A SATURATED ALIPHATIC POLYHYDRIC ALCOHOL HAVING AT LEAST THREE HYDROXYL GROUPS, WHERE SAID POLYESTER OF (2) HAS A VISCOSITY OF GREATER THAN ABOUT 58,000 CENTIPOISES AT 25*C., AND WHEREIN SAID REACTION MIXTURE, SAID HYDROLYSIS PRODUCT OF (1) IS PRESENT AT ABOUT 70 TO 95 PERCENT BY WEIGHT AND SAID POLYESTER OF (2) IS PRESENT AT ABOUT 30 TO 5 PERCENT BY WEIGHT, BASED ON THE WEIGHT OF SAID HYDROLYSIS PRODUCT OF (1) AND SAID POLYESTER OF (2).