Polymeric Azo Dyes Derived from Copolymers of 3-Hydroxy-2-naphth(m-methacrylamide)anilide and Methyl Methacrylate or Stylene, and Their Light Fastness

Abstract

To improve the solubility of Naphthol AS series polymeric dye intoresins and to investigate the effect of dye content in polymeric dye on light fastness, polymers containing the coupling component in various proportions were rst prepared by copolymerization of 3-hydroxy-2-naphth(m-methacrylamide)anilide.and methyl methacrylate(MMA)or stylene(St), second, MMA polymers, that was copolymerized 4-[2-methoxy-5-(diethylsulfamoy1)pheny1]azo-3-hydroxy-2-naphth(m-methacrylamide)anilide in the proportion of 43.0, 28.1, 18.4 and 9, 2 wt%, and third St polymers, ontaining t:he dye group in the proportion of 34.2, 20, 1, 11.4 and 6, 2wt%, were prepared by the coupling reaction of the copolymers with 2-CH30-5-(C2H5)2-NSO2CeHsN2BE in DMF.
The comparison of light-fastness of these polymeric dyes and the control monomeric dye was carried out by measuring the decrease in optical density at 512nm in casting film As a result, polymers which contained the dye Iess than 10 wt%Showed the best Iight fastness as well as that of mbnomeric dye, but Iight fastness of other polymeric dyes became poor with in.creasing dye content. It seemed the at light fastness of the polymeric dyes depended on the dye content.