A pulverulent ink comprising in the structure a heat-fusible core comprising a thermo-melting substance and a coloring matter and a shell covering the core on the surface and comprising a resin product obtainable by reacting:
(1) 0 to 30 mole % of a monovalent isocyanate compound and/or a monovalent isothiocyanate compound and
(2) 100 to 70 mole % of a divalent isocyanate and/or a divalent isothiocyanate compound with
(3) 0 to 30 mole % of a compound having an active hydrogen atom to react with the isocyanate and isothiocyanate groups of (1) and (2) and
(4) 100 to 70 mole % of a compound having two active hydrogen atoms to react with the isocyanate and isothiocyanate groups of (1) and (2); at a molar ratio of (1) and (2) to (3) and (4) in the range between 1:1 and 1:20, at least 30 percent of all the linkages involved in the isocyanates and the isothiocyanates in the resin product being thermally dissociating. The powder ink is advantageously used in a method for printing an image on a substrate, which comprises forming an image by a thermally transferring printing method and reproducing an ink sheet with electrostatic energy.
一种粉状油墨,其结构包括一个由热熔物质和着色物质组成的热熔芯体,以及一个表面覆盖芯体并由可通过反应获得的
树脂产品组成的外壳:
(1) 0 至 30 摩尔%的一价
异氰酸酯化合物和/或一价异
硫氰酸盐化合物和
(2) 100 至 70 摩尔%的二价
异氰酸酯和/或二价异
硫氰酸酯化合物与
(3) 0 至 30 摩尔%的具有活性氢原子的化合物,可与(1)和(2)中的
异氰酸酯和异
硫氰 酸酯基团反应,以及
(4) 100 至 70 摩尔%的具有两个活性氢原子的化合物,与(1)和(2)的
异氰酸酯和异
硫氰酸 酯基团发生反应;(1)和(2)与(3)和(4)的摩尔比在 1:1 至 1:20 之间,
树脂产品中
异氰酸酯和异
硫氰酸 酯所涉及的所有连接中至少有 30%是热解离的。粉末墨
水可用于在基材上印刷图像的方法,该方法包括通过热转印印刷方法形成图像,并利用静电能量复制墨片。