Asahi Kasei Kogyo Kabushiki Kaisha

Shigeyuki Miyata

Akio Yamori

Yoshikazu Suda

Haruhisa Nagano

A hot-melt pressure-sensitive adhesive composition comprising (a) 100 parts by weight of a specific grafted block copolymer material formed by the graft reaction of at least one block copolymer comprising at least one polybutadiene or polyisoprene block and at least two polystyrene blocks with at least one unsaturated carboxylic acid monomer and/or derivative monomer thereof and (b) 50 to 250 parts by weight of a specific tackifier mixture consisting of a tackifier S comprising at least 50% by weight of a terpene resin having a softening point of 60.degree. C. or more and a tackifier L comprising at least 50% by weight of a terpene resin having a softening point of 30.degree. C. or less and having an S/L mixing weight ratio of 9/1 to 3/7, and optionally 1 to 50 parts by weight of a softening agent has been found to be excellent in holding power especially for paper.

Growing community of inventors

Yokohama, Japan

Shigeyuki Miyata