Updates
** U.S.-listed shares of chemical companies gain premarket
** U.S. said it will begin a blockade of maritime traffic entering and leaving Iranian ports and coastal waters after weekend peace talks with Iran failed
** Disruptions to oil and petrochemical flows through the Strait of Hormuz following the outbreak of the Iran war have tightened global chemicals supply and lifted prices of plastics and polymer
** Chemical companies DOW DOW.N up ~2%, LyondellBasell LYB.N inches up ~3%
** Eastman Chemical EMN.N advances 2.1%
(Reporting by Dharna Bafna in Bengaluru)
((Dharna.Bafna@thomsonreuters.com))