| 摘要 |
PURPOSE:To prevent marks from being damaged or removed by allowing adhesion through thermal curing of a paste containing a plasticizer for resin based mainly on polyvinyl chloride on the surface of a sheet with a specific polyurethane resin layer formed on an undercoat of specific polyurethane resin. CONSTITUTION:A polyurethane resin layer on the surface of a sheet consists of a layer of polyurethane resin B with thermally softening temperatures of 60 to 150 deg.C in repeating units such as expressed by formula II, which is formed on an undercoat of polyurethane resin A with thermally softening point of 130 deg.C or more in repeating units such as expressed by formula I. The polyurethane resins A, B are preferably those consisting of organic diisocyanate, polymer diol, soft segments and a chain expander. In the formulae, R1 is a residual divalent organic diisocyanate group excepting an isocyanate group, R2 a residual polymer diol group with a molecular weight of 800 or more excepting the hydrogen atom of hydroxyl, R3 a residual low molecular diol group with a molecular weight of 200 or below excepting the hydrogen atom of hydroxyl, R4 the residual organic diisocyanate group of an aliphatic or an alicyclic group, R5 a residual polymer diol group with a molecular weight of 1,000 or more excepting the hydrogen atom of hydroxyl, and R6 a residual low molecular diol group with a molecular weight of 400 or below excepting the hydrogen of hydroxyl. |
