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