低シスポリブタジエンの配合物に及ぼすプロセスオイルの影響-1- (ステレオラバーの諸問題(特集))

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The low cis polybutadiene can be used with high loading of oil and fillers, and it is much important for practical point of view to investigate the correlationship between the kind of compounded process oil and the compound properties. In this report the effects of loading level of oil and carbon, and those of kind of process oil, upon the physical properties of compounds, are studied. Comparisons are made so as that the hardness of the compounds are maintained 60-65 (JIS, Hs). The results are : (1) Compounds which contain aromatic oil bear higher compound Mooney viscosity than those with naphthenic or paraffinic oils. The higher the viscosity of compounded process oil, the higher the compound Mooney viscosity. (2) On high loading, aromatic oils vest rather better tensile properties, but worse resilience and heatbuild-up. (3) Paraffinic oil compounds are more resistant to abrasion. The higher the aromaticity of oils the worse the resistance to abrasion. (4) Low temperature properties of compounds are dependent on the flow point of the compounded oil. (5) Paraffinic oils bring about less contamination and discoloration. (6) These results are not necessarily coincide with those which have been shown in leteratures for SBR, EPT and polybutadiene.