BAYER PRESENTS NITRILE TECHNICAL PAPER AT ACS RUBBER EXPO 03

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BAYER PRESENTS NITRILE TECHNICAL PAPER AT ACS RUBBER EXPO 03
14 October 2003 - Bayer MaterialScience AG

Nitrile elastomers are used in many demanding environments and frequently come in contact with ozone during service. Unfortunately, nitrile elastomers, unless hydrogenated, have relatively poor resistance to ozone.

Attempts to improve their ozone resistance by the addition of conventional antiozonants provide only moderate improvement in performance. Fluxing polyvinyl chloride (PVC) into the nitrile matrix is an effective method of improving ozone resistance but at the expense of additional mixing costs, higher compression set and poorer low temperature properties.

Copolymers of ethylene and vinyl acetate (EVM) have a fully saturated backbone and are therefore very resistant to ozone. Ethylene vinylacetate copolymers being relatively polar can be blended with nitrile polymers to improve certain properties of the blend and in particular ozone resistance.

This paper will review typical methods of improving nitrile's resistance to ozone and demonstrate the effectiveness of blending ethylene vinylacetate copolymers and nitrile rubber to improve performance against ozone. Finally, we will suggest application areas where these blends should have distinctive advantages such as in halogen free environments.

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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.

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