PROCESS FOR THE PREPARATION OF PETROLEUM RESINS

摘要

A process for the preparation of petroleum resins from hydrocarbon fractions containing olefins and diolefins, having a boiling range of from about 30 DEG to 300 DEG C, which comprises A. SUBJECTING SAID HYDROCARBON FRACTION TO PRE-POLYMERIZATION WITH TRANSFORMATION INTO HIGH-BOILING PRODUCTS IN QUANTITIES EQUAL TO OR SMALLER THAN ABOUT 20 PERCENT BY WEIGHT WITH RESPECT TO THE FRACTION ITSELF; B. SUBJECTING THE RESIDUAL HYDROCARBON FRACTION, AFTER SEPARATION OF THE HIGH-BOILING PRODUCTS, TO POLYMERIZATION IN THE PRESENCE OF Friedel-Crafts catalysts with conversion into polymer of a quantity equal to or smaller than about 40 percent by weight with respect to the hydrocarbon fraction fed to the pre-polymerization, and C. RECOVERING THE PETROLEUM RESIN FROM THE POLYMERIZATION PRODUCTS.