Bimodal block copolymer containing tapered block, process for manufacturing method and its usage

摘要

The present invention relates to a bimodal linear block copolymer containing a tapered block and its manufacturing method. The bimodal linear block copolymer includes a hepta-block copolymer of vinyl aromatic block(PS1)-conjugated diene block(PB1)-tapered block(T1)-vinyl aromatic block(PS2-PS3)-conjugated diene block(PB2)-tapered block(T2)-vinyl aromatic block (PS4), and a tetra-block copolymer of vinyl aromatic block(PS3)-conjugated diene block(PB2)-tapered block(T2)-vinyl aromatic block (PS4) as prepared by adding two charges of an initiator. The bimodal linear block copolymer is prepared by adding several charges of the initiator, vinyl aromatic monomers and conjugated diene monomers to acquire transparency, toughness, rigidity and flexibility, and thereby can be used for sheets or films, or injection or blow molding products.