Rapidly immobilizing paper coating compositions may be prepared by formulating an aqueous coating composition comprising a cationic starch, pigment and sufficient base to obtain a pH above the pK of the starch derivative so that the starch is no longer cationic; coating the paper substrate; and lowering the pH of the coating such that the starch becomes cationic.
快速固定纸张涂层组合物的制备方法是:配制一种
水性涂层组合物,其中包括阳离子淀粉、
颜料和足够的碱,以获得高于淀粉衍
生物 pK 的 pH 值,从而使淀粉不再是阳离子;涂布纸基材;然后降低涂层的 pH 值,使淀粉变成阳离子。