to give an acrylic pressure sensitive adhesive a the glass transition temperature tg of the acrylic polymer was u2212 58 u00b0 c 100 parts by weight of an acrylic pressure sensitive adhesive rheocoat 1020 number average molecular weight 850 000 manufactured by daiichi race were dissolved in 400 parts by weight of toluene to give an acrylic polymer solution 20 parts by weight of polyisocyanate colonate l manufactured by nippon polyurethane industry co ltd were added to the above solution in an amount of 100 parts by weight of solids content in the solution to give an acrylic pressure sensitive adhesive b the glass transition temperature tg of the acrylic polymer was u2212 20 u00b0 c the acrylic pressure sensitive adhesive a was applied onto a base material made of polyethylene thickness 100 u03bcm and dried to form a pressure sensitive adhesive layer thickness 5 u03bcm whereby a pressure sensitive adhesive sheet was produced the adhesion of the pressure sensitive adhesive sheet was 4 0 n 25 mm sheet width the evaluation of removability of fluorescent substance u2218 a pressure sensitive adhesive sheet was produced in the same manner as in example 1 except that the thickness of the pressure sensitive adhesive layer was.