Rhein Chemie

Rhenocure® ZBOP/S – Highly active dithiophosphate accelerator for tire compounds

Rhenocure® ZBOP/S – Highly active dithiophosphate accelerator for tire compounds

Tuesday, 07. March 2006 The rubber specialists at Rhein Chemie Rheinau GmbH, Mannheim, Germany have succeeded in developing Rhenocure® ZBOP/S, a new special accelerator for use with silica tires. The use of dithiophosphate accelerators or sulfur donors in the vulcanization of diene rubbers has been common practice for many years: Compared with conventional accelerators, they offer advantages such as lower reversion tendency of natural rubber, heat stability of the vulcanizates, or high solubility in rubbers of varying polarity.

Mannheim – The rubber specialists at Rhein Chemie Rheinau GmbH, Mannheim, Germany have succeeded in developing Rhenocure® ZBOP/S, a new special accelerator for use with silica tires. The use of dithiophosphate accelerators or sulfur donors in the vulcanization of diene rubbers has been common practice for many years: Compared with conventional accelerators, they offer advantages such as lower reversion tendency of natural rubber, heat stability of the vulcanizates, or high solubility in rubbers of varying polarity.
Most recent tests have demonstrated that it is possible to substitute the secondary accelerator Diphenyl Guanidine (DPG) with Rhenocure® ZBOP/S without any problems in highly loaded silica compounds based on styrene butadiene rubber (SBR) and, at the same time, benefit from improved vulcanization, reversion behavior, heat aging resistance, and the mechanical-dynamic properties of the vulcanizate. These benefits are especially marked in natural rubber compounds where it was possible to considerably reduce dynamic heat built up, in particular. In addition, Rhenocure® ZBOP/S is able to increase the coupling intensity between the rubber and the silica filler, just like other dithiophosphate accelerators. This allows higher dynamic elastic modulus at service temperatures, while the good dampening properties remain unimpaired at low temperatures.

Rhein Chemie is a chemicals company which has had a successful track record in customized additives and service products stretching back over 100 years. Each year, the approximately 970-strong workforce produces and sells products for various sectors of the rubber, lubricant, plastics, and polyurethane industries. Around 550 staff are employed at headquarters in Mannheim-Rheinau. 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.

Mannheim, 07. March 2006
bit (2006-03-802EN)

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.