| 摘要 |
PURPOSE:To obtain stably the titled petroleum resin suitable as printing ink, etc., having a high softening point, improved solubility, and hue, by polymerizing thermally a raw material consisting essentially of (di)cyclopentadiene, removing an unreacted part and a solvent, and polymerizing thermally again under a specific condition. CONSTITUTION:A raw material consisting essentially of (di)cyclopentadiene (preferably >=50 wt.% content) is thermally polymerized in the presence or absence of a solvent such as benzene, etc. preferably in an inert gas such as nitrogen gas, etc. at 200-300 deg.C for 10 minutes - 10 hours, preferably at 240-300 deg.C for 10 minutes - 5 hours. Then, the pressure is reduced, an unreacted component and the solvent are removed by distillation, etc., and the resultant product is thermally polymerized again preferably in the absence of a solvent in an inert gas under negative pressure or approximately at normal pressure at 200-300 deg.C for 0.1-5 hours, preferably 0.2-3 hours, to give the aimed petroleum resin having >= 120 deg.C softening point, precisely 120-220 deg.C, having hue of light yellow - yellow. EFFECT:The petroleum resin is completely dissolved in an equal volume of toluene at least at room temperature completly, to give a solution having hue of <= 10 Gardner.
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