GB946379A - Process for producing phenol-modified coumarone-indene type resins - Google Patents

Abstract

A process for producing phenol-modified coumarone-indene resins comprising polymerizing an anhydrous mixture of an essentially aromatic naphtha boiling principally in the range 160 to 200 DEG C. in which indene is the principal polymerizable constituent, and anhydrous cresylic acids, in proportions such that a small excess of said acids remain in the reaction mixture when the reaction is terminated, in the presence of an organic complex of boron trifluoride at a temperature not in excess of 110 DEG C. until the specific gravity of the reaction mixture becomes substantially constant, neutralising the catalyst, removing unreacted materials from the reaction mixture and recovering the alcohol-soluble phenol-modified product. In one modification the naphtha and cresylic acids are mixed and the catalyst thereafter added incrementally at such a rate that the temperature does not exceed 110 DEG C. In another modification the cresylic acids and catalyst are mixed, preferably together with an aromatic hydrocarbon boiling above the reaction temperature but below 300 DEG C., and the naphtha added at such a rate that the temperature of the reaction mixture does not exceed 110 DEG C. The first modification may give predominantly solid products and the second predominantly liquid products. The preferred organic complexes are those of boron trifluoroide with alkyl ethers and alkanoic acids, e.g. methyl ethyl ether, diethyl ether, dipropyl ether, acetic acid and propionic acid.