Mitsui Petrochemical Industries, Ltd.

Yoshiyuki Iwase

Isao Hashimoto

Takayuki Nakano

Shigeru Katayama

Teijiro Morimoto

A hydrocarbon resin having improved color and thermal stability is prepared from a petroleum cracking or reforming fraction containing cationically polymerizable hydrocarbons and having a boiling range of 140.degree. to 280.degree. C. The petroleum fraction is first heat-treated with an .alpha., .beta.-unsaturated dicarboxylic acid anhydride at 50.degree. to 250.degree. C., and then polymerized in the presence of a catalyst. The hydrocarbon resin is useful as a binder component in hot-melt adhesives, pressure-sensitive adhesives and thermofusible traffic paints.

Process for producing hydrocarbon resins having improved color and

A process for preparing a hydrocarbon resin which comprises copolymerizing (A) a hydrocarbon fraction boiling within the range of 130.degree. to 300.degree. C. obtained by cracking, reforming and/or refining petroleum with (B) dicyclopentadiene in the presence of a Friedel-Crafts catalyst in a proportion such that the resulting hydrocarbon resin contains, based on the total weight thereof, 20 to 80% of a unit derived from the dicyclopentadiene (B). A hydrocarbon resin having a number average molecular weight of 300 to 2500, a softening point of 40.degree. to 180.degree. C., a bromine number of 5 to 100 g/100 g, and a Gardner color hue of 5 to 17, prepared by the above process. This hydrocarbon resin is useful as an adhesive component of pressure-sensitive adhesives and hot-melt composition.

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Iwakuni, Japan

Yoshiyuki Iwase