Chlorinated rubber viscosity grade

The chlorination of low molecular weight natural rubber from Guayule (Parthenium Argentatum Grey) has been accomplished. The structure of the chlorinated product is consistent with that of chlorinated Hevea rubber. The use of Azo-bis-isobutyronitrile was as a catalyst resulted in increased chlorine content with a concomitant reduction in molecular weight, thereby allowing the preparation of lower viscosity grades of chlorinated rubber. 

Parion Chlorinated rubber, available in various viscosities and grades. ... 

Commercial Products. Chlorinated rubber is only produced by a few manufacturers. Trade names include Aquaprene (Asahi Denka), Chlortex (Caffaro), Pergut (Bayer) [2.8], Superchlon (Nippon Papers). These products are available in various viscosity grades, whose ranges largely coincide for the aforementioned commercial products (table 2.3). 

Table 2.3. Viscosity grades of Pergut, an example of commerical chlorinated rubber product...

Composition. The binder consists of ca. 65 % chlorinated rubber (usually low-viscosity grades) and ca. 35% plasticizer. Chlorinated paraffins are delivered by ICI (Cereclor) and Clariant, Muttens (CH). Special nonhydrolyzable plasticizers may be... 

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