| 摘要 |
PURPOSE: To efficiently produce a hot-melt adhesive having self-adhesive properties or requiring a long time in the disappearance of self-adhesive properties and to provide a hot-melt adhesive block generating no industrial waste as is conventional and capable of obtaining the heating stability and coating stability of the hot-melt adhesive at a time of use. CONSTITUTION: In a double column-shaped hot-melt adhesive block, a hot-melt adhesive for a core layer contains an ABA type styrene block copolymer as a base polymer and has self-adhesive properties in a normal state or requires a long time in the disappearance of self-adhesive properties and a hot-melt adhesive for a skin layer consists of 15-50wt.% of an ABA type styrene block copolymer containing 25wt.% or more of styrene, 30-60wt.% of styrenic, hydrogenated petroleum type or rosin ester type additive with a softening point of 120 deg.C or higher and 5-35wt.% of paraffinic oil, naphthenic oil or a mixture of them. |
