Process for producing hydrocarbon resins having improved color and thermal stability

摘要

A process for producing a hydrocarbon resin having improved color and thermal stability, which comprises treating a petroleum cracking or reforming fraction containing cationically polymerizable hydrocarbons and not more than 0.7% by weight, based on the fraction, of cyclopentadienes and having a boiling range of from 140 DEG C. to 280 DEG C., with 0.8 to 3.0 moles, per mole of the cyclopentadienes, of a dienophile compound having a carbon-to-carbon double bond and a carbonyl or cyano group adjacent to the double bond; and then polymerizing the treated petroleum fraction in the presence of a polymerization catalyst.