Synthetic rubber manufacturer Zeon in the elastomer materials business reported sales of 111.41 billion yen ($839.56 million), up 12.7 percent year-on-year, and operating profit of 9.33 billion yen, down 13.9 percent in the first half (April-September) of the fiscal year ending March 2023. Sales volume of synthetic rubber remained steady. Commodity synthetic rubber volumes were firm due to high tire…