Low Water Absorption Copolymers - Nonstaining Superior Processing Type

Important Quality Factors in Styrene-Butadiene Rubber (SBR) as Affected by Stabilizers and Flocculation Techniques.

“…Glasgow' and Vila (5) demonstrated that SBR flocculated with salt and sulfuric acid exhibits poorer heat stability than polymer flocculated with sulfuric acid alone. The straight acid coagulation method is made commercially practical by using a small quantity of glue in the acid solution (9,10). Alum-coagulated polymers also show improved heat stability when compared to polymer coagulated by the conventional salt-acid method (7,5,15,17,22).…”

“…An enlightening discussion of the effects of organicsoluble iron in the degradation of oil-extended cold SBR is given by Reynolds (13). Manganese in SBR is also deleterious (10,14). Surprisingly, copper has been reported to inhibit oxidation in uncured SBR polymer but to promote oxidation of an SBR vulcanizate (15).…”