TEMPERATURE CONTROL DISPLAY LABEL

摘要

PROBLEM TO BE SOLVED: To provide a temperature control display label in which the lowering of optical density of a developed color can be reduced and the developed color density can be made higher. SOLUTION: The temperature control display label is so constituted that a thermal coloring layer is provided on the rear face of a base material and a tacky adhesive layer is provided on the rear face of the base material, or the thermal coloring layer is provided on the front face of the base material and the tacky adhesive layer is provided on the rear face of the base material. The resin component of the adhesive agent composing the tacky adhesive layer is a (meth)acrylic ester copolymer obtained by carrying out emulsion copolymerization of a monomer consisting mainly of (meth)acrylic ester containing 0-40mass% butyl (meth)acrylate under presence of an emulsifier of polyoxyalkylene ether having a repeating unit of a 2-4C alkylene group in the repeating number of 1-25. The lowering rate of the optical density value of the thermal coloring layer after being left for 21 days under the reaction-promoting conditions of 50°C and 95%RH is 45% or below. COPYRIGHT: (C)2005,JPO&NCIPI