Petroleum resin, hydrogenated petroleum resin, and production method for hydrogenated petroleum resin

A method for producing a hydrogenated petroleum resin comprising:

• a copolymerization reaction step of subjecting a cyclopentadiene-based compound and a vinyl aromatic compound to a copolymerization reaction in the presence of a polymerization solvent;
• a step of performing a removal treatment of a volatile component which is contained in a copolymerization reaction product liquid obtained in the copolymerization reaction step, to obtain a petroleum resin;
• a hydrogenation reaction step of subjecting the petroleum resin to a hydrogenation reaction in the presence of a hydrogenation solvent;
• a step of performing a removal treatment of an unreacted component and a volatile component which are contained in a hydrogenation reaction product liquid obtained in the hydrogenation reaction step, to obtain a hydrogenated petroleum resin concentrate;
• and
• a removal step of a volatile organic compound component by removing a volatile organic compound component from the hydrogenated petroleum resin concentrate, to obtain a hydrogenated petroleum resin containing 6 to 10% by mass of a hydrogenated low-molecular weight material having a molecular weight of 200 to 350,
• wherein the removal step of a volatile organic compound component is constituted of a first step of supplying the hydrogenated petroleum resin into a thin film distillation apparatus, to control the content of the volatile organic compound component to less than 2,000 wt ppm;
• and a second step of supplying the hydrogenated petroleum resin having passed the first step into a nitrogen-stripping apparatus or a steam distillation apparatus, to control the content of the volatile organic compound component to less than 100 wt ppm.