Zeon Corp. (TYO:4205) and Sumitomo Chemical Co. Ltd. (TYO:4005) have reached a basic agreement to begin looking into the consolidation of the two companies’ solution styrene butadiene rubber (S-SBR) businesses. Zeon and Sumitomo Chemical will, by the end of September, complete due diligence and studies pertaining to the nature of the business consolidation. Any definitive agreements stemming from this would…