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News

Active biocide for in-can protection of paint and coatings

Dow Microbial Control : 30 March, 2011  (New Product)
Dow Microbial Control has launched a new class of isothiazalone antimicrobial compounds to the paint and coatings industry. Called Bioban Mbit, this new chemistry has broad spectrum activity against bacteria, mold and yeasts, closing the gaps associated with many conventional means of microbial control.
The spoilage of paint and coating materials following microbial attack has always been a challenge to the industry. Bacteria, yeasts and mold all present serious risks to the quality of paints. One of the major concerns facing manufacturers and their customers has been the protection of these products from attack before use – i.e. while they are still in the can. Among the potential problems caused by unchecked microbial degradation are: product discoloration, viscosity and pH changes, phase separation and sedimentation. Contamination-related health and environmental issues during product manufacturing also need to be added to this list.

The traditional portfolio of preservation products has relied on more conventional materials, including formaldehyde-releaser chemistries. More recently however, the use of 20th Century biocides has come under pressure, with regulators, often responding to customer trends, limiting the number of anti-microbial products on the grounds of health and environmental protection. The remaining biocidal actives, however, are limited in efficacy spectrum, speed of kill and/or chemical stability. In addition, decreases in the use of solvents, the switch to low or zero VOC aqueous paints, initiatives to reduce usage of limited resources and tighter standards in the use of certain chemicals have together resulted in higher susceptibility towards microbial spoilage. All this contributes to increasing difficulties in achieving robust preservation of the new generation of paints.

Dow Microbial Control has closed this gap in the portfolio of active ingredients with the development of a new, environmentally advanced, isothiazolone-based active.

“Formulations based on Bioban Mbit,chemistry have shown broad spectrum activity against bacteria, mold and yeasts, closing the gaps associated with BIT and MIT based biocides,” said Gerhard Tietdke, R&D Manager for Dow Microbial Control. “Bioban Mbit,formulations are effective at very low dosage across a broad pH range. Additionally, Bioban Mbit,can be combined to enhance the performance of existing actives like MIT and BIT.”

Bioban Mbit,has excellent chemical and thermal stability, does not release formaldehyde and does not contain added organohalogens or heavy metals. Moreover, Bioban Mbit,has high water solubility and is therefore a good component for new generations of VOC-free, aqueous coatings.

Mbit chemistry is currently incorporated into two Dow Microbial Control products. Bioban 551S and Bioban 518S, have already been approved in several countries including Australia, China and Korea and will be commercially available in the Asia Pacific Region this autumn. In Europe and in the US, registration dossiers for Bioban Mbit,have been filed and are currently under review by the Regulatory Authorities.

“It is truly rare when a new molecule comes onto the biocides market,” said Celso Magri, Global Strategic Marketing Manager, Paint and Coatings for Dow Microbial Control. “With Bioban Mbit,, we are changing the game by addressing some of the most pressing needs of formulators and paint manufacturers with a new chemistry.”
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