TOKYO, March 10 (Reuters) - Japanese chemical company Mitsui Chemicals has started to cut ethylene production in Japan amid the Iran war, which has reduced the company's feedstock supply because the Strait of Hormuz is blocked, the company said on Tuesday.

* Mitsui Chemicals started to cut production from this weekat its facilities in Osaka and in Ichihara in Chiba, north ofTokyo, due to an expected drop in naphtha supplies from theMiddle East. * Sumitomo Chemical Asia said it issued a force majeurenotice this week for methyl methacrylate production after itsfeedstocks supplier, Singapore petrochemical firm PCS declaredforce majeure on shipments, as the Middle East war has disruptedmaritime transportation and supply chains. * Mitsubishi Chemical on Monday started to cut ethyleneproduction at its plant in Ibaraki, north of Tokyo, the companysaid. * Japan relies on the Middle East for around 95% of its oilsupply and may consider using emergency oil stockpiles, one ofthe world's largest, in coordination with other G7 nations, tosoften the Iran's war supply disruption impact to the markets. * Taiwan's Formosa Petrochemical Corp (FPCC) also issued aforce majeure notice on some petrochemical supplies, includingethylene and propylene.

(Reporting by Kentaro Okasaka and Katya Golubkova; Editing by Sonali Paul)