Solvent-Free Sealant creates smooth concrete surface.

Press Release Summary:



Used as base resin in solvent-free sealant, Desmoseal® S XP 2636 silane-terminated polyurethane prepolymer eliminates bugholes in concrete surfaces. Product cures with moisture from air, or from substrate to which it is applied. Finished product will not foam in presence of water, and provides optimal UV stability as well as adhesion to concrete. Sealant can be used on any concrete surface that has been poured into mold including concrete basement and retaining walls.



Original Press Release:



Solvent-free Sealant from Bayer MaterialScience Creates Smooth Concrete Surface for Coating



Pittsburgh, January 31, 2008 - One of the galling glitches of hardened concrete structures is the "bughole," a small hollow caused by a bubble of air trapped against the side of the support form as the concrete hardens, leaving a permanent void in the finished surface. Bugholes pose a significant problem when applying high-performance coatings to concrete surfaces, and need to be filled in order to achieve a smooth finished coating. Desmoseal® S XP 2636 silane-terminated polyurethane prepolymer by Bayer MaterialScience (BMS) LLC is used as a base resin in a solvent-free, one component sealant ideal for eliminating bugholes in concrete surfaces.

To eliminate bugholes before a high-performance coating is applied to a concrete substrate, a simple caulking gun is used to inject a formulated product based on a Desmoseal resin into a void. The uncured product is then pulled flush with a putty knife, creating a smooth surface ready for coating. This process eliminates the risk of bughole-induced outgassing through the post-applied coating. Outgassing occurs when air becomes entrapped within the cavities and expands over time from the heat of an exothermic coating, thereby causing pinholes, blisters or other defects in the finished surface.

Desmoseal S XP 2636, a silane-terminated prepolymer, is part of a new class of materials that cure with moisture from the air, or from the substrate to which they are applied. The finished products will not foam in the presence of water, and have excellent UV stability and good adhesion to concrete. The products also have very fast re-coat time and can be formulated without solvents.

"Desmoseal S XP 2636 resin is part of our proven portfolio of trusted raw materials formulations," said Jay Johnston, senior associate scientist, Adhesives and Sealants, BMS LLC. "Desmoseal resin formulations result in finished products that cure reliably without bubbles or blisters."

Desmoseal resin-derived sealants can be used on any concrete surface that has been poured into a mold. Common applications include concrete basement and retaining walls.

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 14,900 employees at 30 sites around the world and 2006 sales of 10.2 billion euros from continuing operations. Our innovative developments in coatings, adhesive and sealant raw materials, polycarbonates, polyurethanes and thermoplastic urethane elastomers enhance the design and functionality of products in a wide variety of markets, including the automotive, construction, electrical and electronics, household and medical industries, and the sports and leisure fields. Our inorganic basic chemicals unit produces chlorine and related essential products for the chemicals industry. Let us give life to your vision. Bayer MaterialScience - Where VisionWorks.

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 2006 net sales of 7.8 billion euros and employed 17,200 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 prevent and treat diseases; protect crops and enhance yields; and advance automobile safety and durability.

Contact:
Tom Erdner, Phone: 412-777-5200
E-mail: thomas.erdner@bayerbms.com

For more information about Bayer MaterialScience raw materials for coatings, adhesives and sealants, call 1-800-662-2927, e-mail naftainfo@bayerbms.com or visit www.bayermaterialsciencenafta.com.

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