Oil prices were heading on Friday for a second week of gains on growing expectations that big crude exporters will extend output cuts to curb a persistent glut in inventories. SEE MORE The dollar sagged against the yen on Friday and was on track for weekly losses, bruised by worries that political turmoil in Washington could delay efforts by U.S. President Donald Trump to implement his economic stimulus plans. SEE MORE The growing use of polymer composites has resulted in increasing demand for nanomaterials, such as carbon nanotubes, graphene and nanocellulose, as companies seek alternatives to carbon fibre and petroleum-based packaging, as per Research and Markets. SEE MORE African polyethylene (PE) buyers are still holding out for lower prices despite weeks of limited buying, according to sources this week. SEE MORE A potential agreement by OPEC members to extend an oil supply cut deal may be offset by increasing US crude oil production and rising production in Libya and Nigeria, the International Energy Agency (IEA) said on Tuesday. SEE MORE