A base material containing gelatin, polyvinyl alcohol, methyl acrylate, 2-ethylhexyl acrylate, and l-menthylglycerol ether;For the total mass of the substrateThe content of gelatin is 1.5 to 6% by weight;The content of the polyvinyl alcohol is 0.5 toThe content of the methyl acrylate acrylic acid 2-ethylhexyl copolymer is 0.5 to 13 mass%Adhesive agent.