Mitsui Chemicals, Inc.

Shin Tokui

Hiroshi Hoya

Koji Matsunaga

Yoji Hayakawa

Hiroto Yasui

It is an object of the present invention to provide adhesive compositions having excellent flexibility, rubber elasticity, mechanical properties, heat resistance and low-temperature properties. An adhesive composition of the invention includes 10 to 70 parts by weight of a soft polypropylene resin composition (X) which includes 40 to 98 wt % of a propylene copolymer (A) satisfying the following requirements (A) to (A) and 2 to 60 wt % of a crystalline isotactic polypropylene (B) satisfying the following requirements (B) to (B), and 30 to 90 parts by weight of a tackifier (C) (wherein the total of the component (X) and the component (C) is 100 parts by weight), wherein (A) Shore A hardness: 20 to 90; (A) the copolymer comprises a copolymer with Cunits at 51 to 90 mol %, Cunits at 7 to 24 mol % and C&#x3b1;-olefin units at 3 to 25 mol %; (A) Mw/Mn: 1.2 to 3.5; (A) mm: 85 to 99.9%; (A) value B: 0.8 to 1.3; (A) 2,1-insertion ratio: less than 1%; (A) Tg: &#x2212;10&#xb0; C. to &#x2212;50&#xb0; C.; (A) MFR (230&#xb0; C.): 0.5 to 500 g/10 min; (B) Tm: 100 to 175&#xb0; C.; (B) mmmm: 90 to 99.8%; (B) MFR (230&#xb0; C.): 0.1 to 100 g/10 min.

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Shin Tokui