Examples of the thermoplastic binders for the production of the image formation layer include cellulose derivatives such as methyl cellulose, ethyl cellulose and cellulose triacetate; homopolymers and copolymers of acrylic monomers such as acrylic acid, methacrylic acid, acrylic esters and methacrylic esters; vinyl polymers such as poly (vinyl chloride), poly(vinyl acetate), poly(vinyl butyral) an