Process for producing phenol-modified coumarone-indene type resins

Claim 1

A PROCESS FOR PRODUCING ALCOHOL SOLUBLE PHENOLMODIFIED RESINS WHICH COMPRISES FORMING AN ANHYDROUS MIXTURE OF AN ESSENTIALLY AROMATIC NAPHTHA BOILING PRINCIPALLY IN THE RANGE OF ABOUT 160*C. TO ABOUT 200*C. IN WHICH INDENE IS THE PRINCIPAL POLYMERIZABLE CONSTITUENT, AND ANHYDROUS CRESYLIC ACID, IN PROPORTIONS SUCH THAT A SMALL EXCESS OF SAID ACIDS REMAIN IN THE REACTION MIXTURE WHEN THE REACTION IS TERMINATED, ADDING THERETO A CATALYTIC AMOUNT OF AN ANHYDROUS BORON TRIFLUORIDE CATALYST, SAID CATALYST BEING A COMPLEX OF STOICHIOMETRIC PROPORTIONS OF BORON TRIFLUORIDE AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE LOWER ALKYL ETHERS AND LOWER ALKANOIC ACIDS, IN INCREMENTS SUCH THAT THE TEMPERATURE IN THE REACTION ZONE DOES NOT EXCEED ABOUT 110*C., CONTINUING THE REACTION AT A TEMPERATURE NOT IN EXCESS OF ABOUT 110* C. UNTIL THE SPECIFIC GRAVITY OF THE REACTION MIXTURE BECOMES SUBSTANTIALLY CONSTANT, NEUTRALIZING THE CATALYST, REMOVING UNREACTED MATERIALS THEREFROM AND RECOVERING THE ALCOHOL-SOLUBLE PHENOL-MODIFIED PRODUCT.