Catalytic activity of cationic latices prepared according to the shot-growth method

Stable cationic latexes were prepd. by the shot-growth method and by use of poly(styrene-co-1-methyl-4-vinylpyridinium bromide) (I) as emulsifier. An increase in co-catalytic activity of the shot-growth latexes in the tetra-Na Co(II) phthalocyaninetetrasulfonate-catalyzed oxidative coupling of 2-mercaptoethanol was found compared with the batch latex system. Although I was successfully applied as emulsifier only a moderate increase in oxidn. rate was found compared with the surfactant-free system. The surface characteristics of both latex systems were investigated by z-potential measurement and conductometric titrns. These measurements suggested the presence of a water-sol. hairy polymer shell