MODIFIED HYDROCARBON RESIN AND HOT-MELT ADHESIVE COMPOSITION

A main object of the present invention is to provide a modified hydrocarbon resin that provides a hot melt adhesive composition with low odor, excellent heat stability, and high adhesive properties. The present invention achieves the object by providing a modified hydrocarbon resin obtained by hydrogenating a hydrocarbon resin comprising: a 1,3-pentadiene monomeric unit of 20 mass% to 70 mass%, a C 4-6 alicyclic monoolefin monomeric unit of 10 mass% to 35 mass%, a C 4-8 acyclic monoolefin monomeric unit of 5 mass% to 30 mass%, an alicyclic diolefin monomeric unit of 0 mass% to 1 mass%, and an aromatic monoolefin monomeric unit of 0 mass% to 40 mass%, the modified hydrocarbon resin being characterized in that: a degree of hydrogenation of the olefins is within a range of 30% to 80%; a degree of hydrogenation of the aromatic rings, if an aromatic monomeric unit is included, is within a range of 5% to 20%; a weight average molecular weight (Mw) is within a range of 1,000 to 4,000; a Z-average molecular weight (Mz) is within a range of 2,500 to 10,000; a ratio (Mz/Mw) of the Z-average molecular weight to the weight-average molecular weight is within a range of 1.5 to 2.5; a Gardner color scale of a toluene solution of 50 mass% is 2 or lower; and a difference between pre-hydrogenation and post-hydrogenation mixed aniline point (MMAP) is 5°C or less.