Chlorinated elastomer

When NA-22 is used in chlorinated elastomer with ZnO the following crosslinking mechanism is suggested by Pariser [5] ... 

Novel process on the base of compact tubular reactors is principally fitted for production of bromobutyl rubber and also others chlorinated elastomers. Process is accepted at OAO "Nizhne-kamskneftekhim". In 2001-2002 pilot plant worked at which chlorobutyl rubber of required quality was received without any problems. Technical schedule was made. At present experimental-industrial plant is projected. 

Chlorinated elastomers (polychloroprene, sulphochlorinated polyethylene, chlorinated polyethylene) have fairly good flammability characteristics. Further improvement can be achieved with alumina trihydrate or antimony trioxide. Halogenated phosphoric esters may be applied as plasticizers. 

Chloroprene - pren [chlor- + isoprene] (1931) n. CH2C1-CHC1-CH=CH2. Polymerization of the monomer to poly(l-chloroprene) to form the synthetic chlorinated elastomer. 

Polychloroprene [9010-98-4] was discovered in 1930 at E. I. DuPont de Nemours Co. in Wilmington Delaware. The discovery grew out of a need to develop a synthetic substitute for natural ruhher. DuPont first marketed this first commercially successful synthetic elastomer as DuPrene in 1933. In response to new technology development that significantly improved the product and manufacturing process, the name was changed to Neoprene in 1936. The current commercially acceptable generic name for this class of chlorinated elastomers is CR or chloroprene rubber. 

A combination of TGA and/or DSC and FT-IR spectroscopy has been used to study the thermal behaviour of some polymethacrylates [53] and polyamides [54], chlorinated elastomers [55], polyamides and polyimides [56], poly(3-hydroxybutyrate) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [57], polypropylene carbonate [58], polyacrylonitrile [59], polyimides [54], polyurethanes [60], styrene-nitrostyrene copolymers [61], bisphenol A-based polycarbonates [62], and polymethacrylates [53]. 

These natural raw materials are very important because through electrolysis chlorine can be obtained for the manufacture of chlorinated elastomers as well as other chlorinated rubber compounding ingredients. Magnesium is also extracted for production of magnesium oxide, which is commonly used as a curative for chlorinated elastomer-based compounds. 

Zinc oxide, although an activator and crosslinking agent in chlorinated elastomers, also serves as an inert filler providing very good thermal conductivity. 

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