Rhein Chemie

Rhenogran® XLA-60. Safe curing agent for polyacrylate rubber compounds containing no DOTG

Rhenogran® XLA-60. Safe curing agent for polyacrylate rubber compounds containing no DOTG

Wednesday, 05. December 2007 With its new Rhenogran® XLA-60 product, Rhein Chemie Rheinau GmbH, based in Mannheim, Germany, has succeeded in developing a curing agent that serves as a substitute for DOTG accelerators in polyacrylate rubber compounds.

Mannheim – With its new Rhenogran® XLA-60 product, Rhein Chemie Rheinau GmbH, based in Mannheim, Germany, has succeeded in developing a curing agent that serves as a substitute for DOTG accelerators in polyacrylate rubber compounds.

When polyacrylate rubber products are cured with systems comprising HMDC (hexamethylenediamine carbamate) and DOTG (N,N’-di-ortho-toluylguanidine), the process generates o-toluidine emissions in volumes that constitute a health hazard. According to recent studies, o-toluidine can cause cancer. In 2006 it was classified as a Category 1 carcinogen in the German Research Foundation’s MAK and BAT Thresholds for Chemicals at the Workplace (DFG, Issue 2006). O-toluidine can also be released by vulcanizates manufactured with N,N’-di-ortho-toluylguanidine. For these reasons, the rubber processing industry increasingly recognizes it as a potential health risk. Rhein Chemie now is introducing a safer alternative to DOTG: Rhenogran XLA-60. In combination with HMDC, it takes over the function of DOTG and reliably eliminates the formation of o-toluidine.

This distinct advantage is paired with high-level performance. The use of Rhenogran XLA-60 in AEM and ACM compounds has been observed to have the following influences on vulcanization behavior and physical propertie

      • Good processing characteristics
      • Equivalent physical properties
      • Comparable aging and oil resistance
      • Low compression set
      • Good storage stability at room temperature
      • Low risk potential for humans and the environment

 

Polyacrylate rubber is a polymerizate made of ethyl acrylate or butyl acrylate with minimal addition of a monomer that enables curing. Polyacrylate rubber products are used successfully in a wide variety of dynamic applications in the automotive industry, including for example seals and hoses. The vulcanizates offer balanced properties in terms of media and high/low temperature resistance, as well as low-temperature flexibility.

Rhein Chemie also markets a number of special agents for curing polyacrylate rubber products, such as Rhenogran®HMDC-70/AEMD, Rhenogran® ZDDT-50 and Aflux® 18.

Rhein Chemie is a chemicals company which has had a successful track record in customized additives and service products stretching back over 100 years. The approximately 900-strong workforce produces and sells products for various sectors of the rubber, lubricant, plastics, and polyurethane industries worldwide. Around 550 staff are employed at headquarters in Mannheim-Rheinau, Germany. The company has subsidiaries and production facilities in Europe, Asia, and North and South America. Rhein Chemie is a wholly owned subsidiary of LANXESS Deutschland GmbH, Leverkusen, Germany.

Mannheim, 05. December 2007
bit (2007-12-815EN)

Forward-Looking Statements

This news release contains forward-looking statements based on current assumptions and forecasts made by the management of Rhein Chemie Rheinau GmbH. 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 our sole stockholder LANXESS Deutschland GmbH and the estimates given here. These factors include those discussed in LANXESS AG’s reports to the Frankfurt Stock Exchange. LANXESS AG and Rhein Chemie Rheinau GmbH assume no liability whatsoever to update these forward-looking statements or to conform them to future events or developments.