| 摘要 |
PURPOSE:To enhance resistance to heat, wear and chemicals and to print images with high reliability, by providing on a base an ink layer which comprises a polyamic acid salt having a specified repeating unit, a resin containing an oxirane ring, and a coloring agent as main constituents. CONSTITUTION:An ink layer comprising a polyamic acid salt having a specified repeating unit of formula I, a resin containing an oxirane ring, and a coloring agent as main constituents is provided on a base. In formula I, R1 is a divalent group of at least 2 carbon atoms, R2 is a tetravelent group of at least 2 carbon atoms, and each of R3, R'3, R''3, R4, R'4, R''4, R5 and R6 is a monovalent aliphatic group of 1-30 carbon atoms, a monovalent alicyclic group, a monovalent aromatic group, a monovlent group having aromatic and aliphatic groups bonded to each other, a group derived through substituting one of the above groups by a halogen, nitro, amino, hydroxyl, methoxyl or acetoxyl group, a monovalent group derived through substitution of one of the above groups by a group bonded to -O-, -COO-, -NHCOO-, -CO, -S-, -CSS-, -NHCS-, -N=N- or the like, or hydrogen. |
