TINY PARTICLES, BIG EFFECT

Main Menu | News By Date | News By Supplier | News By Category | About Us

TINY PARTICLES, BIG EFFECT
27 April 2004 - Bayer MaterialScience AG

With the Dispercoll® S line of products, Bayer MaterialScience AG introduces an assortment of silica gel dispersions that are particularly suitable for the formulation of one-component aqueous adhesives.

Adhesives formulated with these products are characterized above all by their high green strength. This enables manufacturers of various end products to continue processing immediately after bonding, resulting in a significant leap in productivity. Furthermore, the new additives impart aqueous adhesives with a longer open time and thus ensure a longer processing.

Dispercoll® S products are particularly advantageous in formulating aqueous adhesives with Dispercoll® C polychloroprene dispersions. In particular, adhesives formulated with products with a high hydroxyl content, such as Dispercoll® C 2325, exhibit a significantly greater heat resistance that was previously attainable only through the use of two-component technology. A combination of these raw materials is therefore the system of choice for the formulation of one-component aqueous adhesives that must withstand elevated temperatures.

These additives also offer interesting new options for the formulation of other aqueous adhesive systems, such as those based on Dispercoll® U polyurethane dispersions. The primary applications for this type of aqueous adhesives are the furniture, automotive, shoe and construction industries. There is a strong trend in these industries toward reduced-solvent, and thus more environmentally compatible, adhesive systems.

Dispercoll® S dispersions contain silicon dioxide with particles sizes between 9 and 55 nanometers, and also vary in solids content. “The desired application viscosity of the adhesives can be precisely formulated by selecting the appropriate silica gel or by combining various types. That means a broad viscosity range, from paste-like to liquid consistencies, can therefore be covered”, says Dr. Rüdiger Musch, an expert on polychloroprene adhesive raw materials at Bayer MaterialScience. “The formulation possibilities are almost endless – highly pseudoplastic types can even be easily applied to vertical surfaces.” The specific crosslinking and gelling behavior of the nanoparticles also imparts the adhesives with additional outstanding properties. In addition, formulated adhesives containing Dispercoll® S also show very good storage stability.

http://www.bayermaterialscience.com

About: Bayer MaterialScience AG
Bayer Corporation, headquartered in Pittsburgh, is part of the worldwide Bayer Group, an international health care, nutrition and innovative materials group based in Leverkusen, Germany. Bayer employs 23,300 in North America with net North American sales of 8.8 billion euros in 2003. Bayer’s three operating business areas – HealthCare, CropScience and MaterialScience, improve people’s lives through a broad range of essential products that help diagnose and treat diseases, protect crops and advance automobile safety and durability.

Bayer MaterialScience AG is one of the world's largest producers of polymers and high-performance plastics. The main customers for Its innovative developments in coatings, adhesives, insulating materials and sealants, polycarbonates and polyurethanes are the automotive and construction industries, the electrical/electronics segment and manufacturers of sports and leisure goods, packaging, and medical devices.

More News:
  • For April 2004
  • From Bayer MaterialScience AG
  • For General