Thor Gmbh

Peter Erich Hahn

Thomas Wunder

Rüdiger Baum

Hans-Jurgen Schmidt

Rudiger Baum

Hans-Jürgen Schmidt

The invention relates to an aqueous biocide composition, containing the following components: (a) 9 wt. % to 20 wt. % 1,2-benzisothiazolin-3-one, (b) a dissolved alkalizing agent, containing 0.95 to 1.05 mol sodium and potassium hydroxide, each based on one mol of the 1,2-benzisothiazolin-3-one present as component (a), and (c) more than 60 wt. % water. The biocide composition is characterized in that the composition: (i) has a pH value in the range of pH 9.5 to pH 11.9, and (ii) the molar fraction of sodium ions, based on the sodium and potassium ions present in the composition, is in the range of 15 to 45 mol %. The invention furthermore relates to the use of these biocide compositions for preserving water-based products of all kinds, such as cleaning and household products, plastic dispersions, paints, plasters, adhesives, sealing compounds, paper coating compounds, textile softening and sizing agents, detergent base materials, surfactants, polishing agents, spinning baths, cooling lubricants, leather treatment agents, and silicone and bitumen emulsions.

Aqueous 1,2-benzisothiazolin-3-one concentrates

The invention relates to a method for reducing microbial attack of products in the context of which 5-chloro-2-methyl-4-isothiazolin-3-one having a content of 2-methyl-4-isothiazolin-3-one in the range from 0 to 2 wt % based on the total proportion of 5-chloro-2-methyl-4-isothiazolin-3-one is employed and in a subsequent method Step at least largely decomposed. The method according to the invention is further characterized in that in a further method Step at least one further component for post-preservation of the products is employed.

Method for reducing microbial attack of industrial products

The present invention relates to a method for producing a coating agent, such as a paint or a plaster, having a 5-chloro-2-methyl-4-isothiazolone content in the range from 0 to 1 ppm, using components which would introduce in total more than 1.5 ppm of 5-chloro-2-methyl-4-isothiazolone into the coating agent. The method comprises the steps: a) decomposing the 5-chloro-2-methyl-4-isothiazolone present in the components of the coating agent with the help of at least one 5-chloro-2-methyl-4-isothiazolone-decomposing compound, such that the content of 5-chloro-2-methyl-4-isothiazolone is in a range from 0 to 1 ppm over the course of a period of less than 24 hours, b) mixing the individual constituents of the coating agent, not definitively selected from the group comprising water, binder, pigment, wetting agent, thickener, thixotropic agent, pH regulating compounds, fillers and dispersants, and c) adding at least one preservative selected from the group consisting of 2-methylisothiazolin-3-one, 1,2-benzisothiazolin-3-one, N-methyl-1,2-benzisothiazolin-3-one and 2-n-octylisothiazolin-3-one.

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Lampertheim, Germany

Peter Erich Hahn