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A 'Two-For-One' Biocide For Latex Coatings Provides Effective In-Can and Dry Film Preservation

SpecialChem / Jul 2, 2003

At every stage of their service lives, latex emulsions and coatings formulated from them are susceptible to contamination and degradation by a variety of microorganisms.1-5 Bacteria can spoil emulsions and paint in the storage container. After paint has been applied to a substrate and dried, it becomes vulnerable to attack by the fungi that cause mildew. To protect against the microorganisms that can cause problems, paint manufacturers must customarily use biocides. In the early 1970s, the most popular biocides for paints were based on phenyl mercury acetate because they had the appealing ability to serve in the dual capacity of in-can preservative and dry film mildewcide.6-8 However, the toxicity and environmental concerns of mercury-based biocides resulted in the paint industry discontinuing their use in the United States in the 1980s. They were replaced by biocides based on alternative chemistries, such as 3-iodo-2-propynyl butyl carbamate (IPBC) and 2-n-octyl-4-isothiazolin-3-one (OIT).9-10 Highly effective against fungi, the new chemistries proved to be very capable mildewcides.

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