Abstract
Buna S-3 chemical rubber was prepared in 5 and 110 gal. glass lined autoclaves. The polymerization conditions were not identical with those reported by the Germans or by a concurrent laboratory program. The polymers failed to heat soften in a manner comparable to the German material but, nevertheless, when the polymer was degraded on a mill and compounded in a standard tire tread recipe the resulting vulcanizate had properties superior to GR–S and approximating those of low temperature chemical rubber, although the Buna S-3 lacked the ease of processing of the low temperature copolymer.
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