The invention provides a method of inhibiting the polymerization of acrylic monomers in an aqueous liquid which contains at least one monomer selected from acrylic acid, acrylic acid esters, acrylamide (in free amide or salt form), methacrylic acid, methacrylic acid esters and methacrylamide (in free acid or salt form) but which aqueous liquid has a pH below 6 and/or contains no salt of acrylic or methacrylic acid, which method comprises adding to said aqueous liquid a polymerization inhibiting amount of a soluble alkali metal, alkaline earth metal, ammonium or alkyl-substituted ammonium salt of nitrosophenol, nitrosonaphthol or nitrosoquinolinol each of the last three nitrosophenols being optionally substituted with one or two of the same or different substituents selected from halo, alkyl, alkoxy and -S03H.
本发明提供了一种抑制
丙烯酸单体在
水性液体中聚合的方法,该
水性液体含有至少一种选自
丙烯酸、
丙烯酸酯、
丙烯酰胺(游离酰胺或盐形式)、
甲基丙烯酸、
甲基丙烯酸酯和甲基
丙烯酰胺(
游离酸或盐形式)的单体,但该
水性液体的pH值低于6和/或不含
丙烯酸或
甲基丙烯酸的盐、该方法包括向所述
水性液体中加入一定量的亚硝基
酚、亚
硝基萘酚或亚硝基
喹啉醇的可溶性碱
金属、碱土
金属、
铵盐或烷基取代的
铵盐,其中后三种亚硝基
酚可任选被一个或两个相同或不同的取代基取代,这些取代基选自卤、烷基、烷氧基和-S03H。