The biodeterioration of polymer emulsions and its prevention with biocides

Abstract

Polymer emulsions, also referred to as polymer dispersions, latices, latex emulsions or latex dispersions are used in an increasingly wide variety of applications including production of emulsion paints, adhesives, paper and textile coatings, non-woven fabrics and carpet-backing compounds. The pH of these polymer emulsions varies greatly, being acidic in the case of some EVA and PVA types whilst some acrylic, styrene acrylic and styrene butadiene products can be relatively alkaline. Many types are susceptible to biodeterioration by micro-organisms, although growth will depend on a number of environmental and nutritional factors. Once growth occurs, a number of effects may be noticed including viscosity changes, production of gases and odours, colour changes and enzyme production with concomitant effects on manufactured end products. Microbiological infection and its effects can be avoided by controlling the quality of and use of less susceptible raw materials and intermediates, by improving plant design, cleanliness and hygiene and by the use of effective, broad spectrum biocides.