To provide a pressure-sensitive adhesive tape having high adhesive strength under high temperature of 60-70°C.
The pressure-sensitive adhesive comprises as a main component a mixture composed of a block copolymer (i) as given below and at least one kind of tackifier resin. The proportion of a block copolymer I) as given below is in the range between 30 and 70 wt.% based on the total amount of the block copolymer and the proportion of A in a block copolymer II) as given below is in the range between 25 and 40 wt.%. The molecular weight of A-B unit and the molecular weight of the total of the block copolymer II are respectively in the specific ranges. (i): a block copolymer comprising a mixture composed of a block copolymer having a structure I and a structure II; I): A'-B' and II): A-B-A, (A-B)n, (A-B)nX and/or (A-B-A)nX [in the formulae, X is a residue of a coupling reagent; A and A' are a polymer block composed of vinyl aromatics; and B and B' are a polymer block composed of a diene polymer.]
GAELLE DE ROTON
Blacksmith
Katsunori Uenishi
Ichiro Torayama