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Published on July 21, 2009

Effective Shortstop for Production of Rubber Compliant With N-Nitrosamine Regulations in Industrial SBR and NBR Emulsion Polymerization

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Date Published July 21, 2009

Free radical emulsion polymerization reactions are used for production of Styrene/Butadiene rubber (SBR) and Acrylonitrile/Butadiene rubber (NBR). The polymerization reactions are stopped short of complete conversion of monomers to polymer to produce elastomers having optimal physical properties for end use applications such as automotive tires, medical gloves etc. The unreacted monomers are separated from the latex, recycled and reused. A primary function of the chain terminating agent, also referred to in the industry as shortstop, is to stop polymerization reaction at the desired conversion and to maintain the conversion at the desired level over time. 
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