| abstract |
(57) [Summary] [Structure] A hot-melt pressure-sensitive adhesive composition comprising a hydrogenated block copolymer having the following specific structure. “(A) ABA type (3 type) or higher molecular weight hydrogenated block copolymer having a structure of terminal A, (b) AB type (2) Type) or lower molecular weight hydrogenated block copolymer, (a) And (b) the aromatic vinyl compound is 25 to 40 (wt%), and the vinyl content before hydrogenation of (a) and (b) is 50 to 6 0 (% by weight), (a) / (b) = 80/20 to 20/8 0 (wt%), Mn of (a) / Mn of (b) = 1.5- The average molecular weight is 20,000 to 80,000 at 4.5. [Effect] The composition has a low melt viscosity required for a hot-melt adhesive, excellent adhesive properties (tack, peel strength, holding power) and thermal stability. It is particularly effective as an adhesive in the field of hygiene materials. |