| 摘要 |
PURPOSE:To obtain an adhesive tape having cushioning characteristics, following distortion of a material to be bonded, showing improved retention properties, by heating an adhesive layer so that a volatile substance in a base material is vaporized and expanded, and a great number of very small closed-cell foams are formed in the adhesive layer. CONSTITUTION:One side of a porous substrate [e.g., paper, (nonwoven fabric) cloth, felt, porous plastic film, etc.] containing about 2-30wt% volatile substance [e.g., water, ethyl acetate, toluene, alcohol, etc.) is provided with a skin layer of PE, PP, etc. having a softening point >=5 deg.C higher than the boiling point of the volatile substance, and the other side is provided with an adhesive layer. The adhesive layer and the substrate are heated, to form a great number of very small closed-cell foams in the adhesive layer. EFFECT:The adhesive tape is releasable without damaging the surface of paper material such as corrugated board paper, etc., and no foam will collapse with collapse with time.
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