EMULSION OF STYRENE WITH METHACRYLIC ESTE RS AS COATING OF PAPERS

Emulsion copolymerization systems are used widely for the production o f paper coatings, textile coatings and adhesives. These systems employ two or more vynilic monomers, such as styrene, but, this compound is water-insoluble. Carboxylated copolymer latexes of styrene are an impo rtant class of industrial emulsions. They have different compositions and properties; they can be also used for many comercial applications. In this work, we have prepared and characterized emulsion copolymeric systems between styrene-methacrylic acid and styrene-methacrylate in order to evaluate the copolymeric emulsion as paper coatings. Emulsion copolymerization of styrene and methacrylic monomers were carried out at 70-degrees, by using a feed monomer ratio 1:1, potassium peroxydis ulfate (0.02, 0.064, 0.15% mol), disodium hydrogen phosphate (0.12%), distilled water (30 ml) and sodium lauryl sulfate (1%). The conversion was 65% for the cid and 85% for the methcrylic esters. The particle s izes were uniform and adequate for the emulsion copolymeric systems. O n the other hand, the sheets with the bleached pulp of industry were m ade and their physico-mechanical properties were determined. After, th e copolymeric emulsion systems were added either to the pulp prior to sheet formation. Then the different properties of paper sheets were me asured. Physico-mechanical properties and thermal stability were incre ased.