| 摘要 |
Provided is an alkenyl aromatic resin which can be used as a hot-melt adhesive agent, has excellent compatibility with a polyethylene resin, and does not undergo the discoloration into yellow or the like. The alkenyl aromatic resin is produced by copolymerizing a mixture comprising the components (A1), (A2) and (A3) mentioned below at -78 to 50ºC with a Friedel-Crafts catalyst, and has a weight average molecular weight of 500 to 1650 in terms of polystyrene. (A1) An alkenyl aromatic compound which has a boiling point ranging from 140 to 180ºC and does not contain indene, and/or at least one aromatic compound which is selected from styrene, a-methylstyrene, vinyltoluene and isopropenyltoluene: 50 to 80 mass%. (A2) A turpentine oil which has a diene value ranging from 15 to 60 (cg/g): 20 to 50 mass%. (A3) A phenol compound: 1 to 15 parts by weight relative to 100 parts by weight of the sum total of the components (A1) and (A2). |
