PROCESS FOR PREPARING TRANSPARENT BLOCK COPOLYMER RESIN, COPOLYMER OBTAINED THEREFROM AND USE THEREOF

摘要

PURPOSE: A process for preparing transparent block copolymer resins is provided to simplify the working process and to improve the mechanical properties such as strength and flexibility of the resin. A block copolymer having various structures and compositions and a transparent bottle and a bubble pack obtained therefrom are also provided. CONSTITUTION: The process for preparing transparent block copolymer resins comprises the step of polymerizing 55 to 95 wt% of at least one of vinyl aromatic monomers and 45 to 5 wt% of at least one of conjugated diene monomers under solution polymerization conditions by multiple introductions of the monomers. The process is characterized by comprising the steps of: introducing a monovinyl aromatic monomer, a polar organic compound and an anionic initiator to obtain an anionic polymer block; introducing a multi-functional compound and a conjugated diene monomer to obtain a mikto-block of the polymer in which linear and non-linear structures are mixed; introducing a conjugated diene monomer; introducing a vinyl aromatic monomer; and introducing a multi-functional coupling agent.