An agent for improving water resistance of ink-jet recording paper which comprises a cationic polyurethane resin obtained by neutralizing amine structures or quaternizing a tertiary amine structure in molecules of a polyurethane which is obtained by reacting (A) an organic isocyanate compound having 2 or more isocyanate groups with (B) a tertiary amine compound having 2 to 10 groups each selected from hydroxyl group and amino group in amounts such that a ratio by equivalent of the isocyanate group to a total of the hydroxyl group and the amino group is 0.5 to 3.0 and an ink-jet recording paper coated with the agent. By coating ink-jet recording paper of regular paper or coated paper with the agent for improving water resistance of ink-jet recording paper of the present invention, water resistance of images and characters recorded on the recording paper is improved and blotting with ink is suppressed.
一种用于提高喷墨记录纸耐
水性的制剂一种用于提高喷墨记录纸耐
水性的制剂,它包括一种阳离子聚
氨酯
树脂,该
树脂是通过中和聚
氨酯分子中的胺结构或季胺化聚
氨酯分子中的叔胺结构而得到的,该聚
氨酯是通过(A)具有 2 个或 2 个以上
异氰酸酯基团的有机
异氰酸酯化合物与(B)具有 2 至 10 个从羟基和
氨基中各选出的基团的叔胺化合物反应而得到的,反应量为
异氰酸酯基团与羟基和
氨基的总和的当量比为 0.5 至 3.0。5至3.0,以及涂有该剂的喷墨记录纸。通过在普通纸或
铜版纸的喷墨记录纸上涂布本发明的改善喷墨记录纸耐
水性的药剂,可改善记录纸上记录的图像和字符的耐
水性,并可抑制墨
水晕染。