| 摘要 |
<p>Petroleum resins of lightened color while retaining satisfactory melting point and compatibility are provided by a process which comprises catalytically polymerizing an aromatic petroleum cracked or reformed fraction, e.g. an aromatic stream boiling between 80°C and 260°C, sequentially treated with sulfuric acid followed by distillation to provide an aromatic feedstock portion which is blended with an aliphatic petroleum cracking or reforming fraction feedstock portion containing cationically polymerizable hydrocarbons, less than 0.5 weight percent of cyclodienes and a pentadiene-1,3 to cyclodiene weight ratio of greater than 50, preferably greater than 200 in the presence of a Friedel-Crafts catalyst into a petroleum resin of lightened color and softening point in the range of 90°C to 115°C. Petroleum resins of light color are provided by a process which comprises successively treating from two to four times a petroleum cracking or reforming fraction, e.g. an aromatic stream boiling between 80°C and 260°C, with concentrated sulfuric acid followed by distillation to provide a feedstock which is thereafter catalyzed in the presence of a Friedel-Craft catalyst into a petroleum resin of light color and high softening point and good compatibility in hot melt adhesive formulations.</p> |
