To obtain the subject tackifier excellent in adhesive properties, initial color tone, offensive smell by using a hydrogenated compound which is a hydrogenation product of an aromatic hydrocarbon resin composed of a polymer of C9 fraction, in a specific hydrogenating ratio.
This tackifier is obtained by using the hydrogenated aromatic hydrocarbon resin which is obtained by polymerizing the C9 fraction, having 5-30 % of hydrogenation degree of aromatic ring, ≤1 Gardener color scale of initial color tone. The C9 fraction is ordinary obtained by naphtha cracking. The preferable softening point of the prescribed aromatic hydrocarbon resin is ordinary 70 to 150°C, the number average molecular weight is 300 to 2000. The hydrogenation of the aromatic hydrocarbon resin is preferably carried out under 100 to 200 kg/cm" of hydrogen pressure, at 200 to 300°C for 2 to 7 hours using nickeldiatomaceous earth catalyst as a hydrogenation catalyst. Preferably, 100 pts.wt. of ethylene based copolymer, 50 to 150 pts.wt. of the objective tackifier and 10 to 100 pts.wt. of wax are used to obtain an adhesive composition using this objective tackifier.
NAGAHARA EIJI
OGASAWARA TAKASHI
