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BMS Develops New Generation of Polyol Dispersions for Low-VOC PUR Coatings: Bayer MaterialScience Puts Environmentally Friendly Waterborne 2K Polyurethane Coatings on the Fast Track

Published on 2008-06-27. Author : SpecialChem

Pittsburgh -- The outstanding properties of polyurethane coatings have made them an up-and-coming segment of the coatings market. The coatings industry's challenge now is to significantly reduce the VOC levels in these coatings without sacrificing high property levels. Bayer MaterialScience LLC (BMS), a leader in coatings raw materials, has addressed this challenge by developing technology for the design of waterborne two-component (2K) polyurethane coating formulations with low emissions, yet the same revered curing speeds and high protection levels as their solventborne counterparts.

In addition to their low emissions of organic solvents, waterborne 2K polyurethane coatings are characterized by rapid curing at low temperatures and a good balance of resistance properties, film appearance and mechanical strength. However, a challenge arises from the fact that waterborne coatings in many cases lag behind solventborne systems with respect to drying speed. To combat this issue, BMS is developing new generations of polyol dispersions for 2K polyurethane systems that exhibit improved physical drying and accelerated chemical curing.

Christoph Irle, BMS AG, discussed these innovative formulations in his poster presentation: Waterborne 2K PUR Coatings on the Fast Track. Irle, along with BMS co-authors Aaron Lockhart, Scott Grace and Ed Squiller, presented their overview at the recent 2008 American Coatings Show and Conference in Charlotte, N.C.

The new generation of highly reactive polyol dispersions developed by BMS allows for the design of waterborne 2K polyurethane coating formulations that exhibit significantly faster drying than traditional systems. This innovative solution greatly increases the productivity of low-VOC 2K polyurethane systems, opening the door for potential new markets, including site-applied, industrial and fast running roll-to-roll applications.

"Rapid growth in the 2K polyurethane coatings market is being driven by legislation, but also by end users demanding low solvent emissions and low smell," said Irle. "Bayer's new generation of polyol dispersions will help pave the road to success for 2K waterborne polyurethane technology, and the continuous development of improved polyols and polyisocyanates will influence new market standards in environmentally friendly high-performance coatings."

The presentation highlighted a new proprietary technology that includes an internal activation of the chemical reaction between polyisocyanate and polyol. The resulting reaction is completed significantly faster, while end properties and important application parameters such as viscosity and pot life are not negatively affected.

The authors explained that this new technology has already been successfully implemented to accelerate formulations at low curing temperatures, and to increase productivity of coatings processes under forced drying conditions.

Bayer MaterialScience LLC is one of the leading producers of polymers and high-performance plastics in North America and is part of the global Bayer MaterialScience business with nearly 15,400 employees at 30 sites around the world and 2007 sales of 10.4 billion euros. Business activities are focused on the manufacture of high-tech polymer materials and the development of innovative solutions for products used in many areas of daily life. The main segments served are the automotive, electrical and electronics, construction, medical, and sports and leisure industries. Our inorganic basic chemicals unit produces chlorine and related essential products for the chemicals industry.

Bayer Corporation, headquartered in Pittsburgh, is a subsidiary of Bayer AG, an international health care, nutrition and innovative materials group based in Leverkusen, Germany. In North America, Bayer had 2007 net sales of 8.1 billion euros and employed 16,800 at year end. Bayer's three subgroups, Bayer HealthCare, Bayer CropScience and Bayer MaterialScience, improve people's lives through a broad range of essential products that help diagnose, prevent and treat diseases; protect crops and enhance yields; and advance automobile safety and durability.

This may contain forward-looking statements based on current assumptions and forecasts made by Bayer Group or subgroup management. Various known and unknown risks, uncertainties and other factors could lead to material differences between the actual future results, financial situation, development or performance of the company and the estimates given here. The company assumes no liability whatsoever to update these forward-looking statements or to conform them to future events or developments.

Source: Bayer MaterialScience


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