Major synthetic rubber firm JSR Corp. (TYO:4185) announced on Oct. 1 that it will be increasing prices for a range of its synthetic rubbers, emulsions and other products from Oct. 21 onward. For synthetic rubbers, the company will raise its per-kilogram prices by at least 15 yen ($0.13) for styrene–butadiene rubber; 16 yen for butadiene rubber; 16 yen for isoprene…