Japan said Friday it will impose antidumping duties of up to 13.5 percent on South Korean companies and 10.3 percent on Taiwanese firms for exporting polyester staple fiber at what it alleges are unfair prices.

Twenty-six South Korean and 13 Taiwan companies will be subject to the duties, officials of the Ministry of Economy, Trade and Industry said following a joint investigation into the case with the Finance Ministry that began in April last year.

The decision will be formalized Tuesday at a Cabinet meeting.