| 摘要 |
PROBLEM TO BE SOLVED: To obtain an adhesive composition which does not cause blocking, etc., when used to stick substrates to each other, and develops excellent adhesive force by incorporating a thermoplastic rubber (A), a diene rubber (B), and a tackifying resin (C). SOLUTION: Thermoplastic rubber A which can be desirably used is exemplified by a styrene/butadiene/styrene block copolymer or a styrene/isoprene/styrene block copolymer. Diene rubber B used comprises at least either of a styrene/ butadiene rubber and a styrene/isoprene rubber and is desirably used in an amount of at most 30 wt.% based on the entire adhesive composition. It is desirable that butadiene rubber B has a styrene content of at most 50 wt.% and a 25% toluene viscosity of at most 80,000 cP. It is possible that a plasticizer, a paraffinic oil, etc., are added to the adhesive composition in order to attain the lowering of melt viscosity, the impartation of flexibility, the adjustment of adhesive force, etc.
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