Patent ID: 6831134
Filing Date: 2004-12-14
Classification: C08F

Abstract:
A method for preparing a transparent block copolymer resin comprising:polymerizing under solution polymerization conditions at least one vinyl aromatic monomer and at least one conjugated diene monomer in a ratio of 55 to 95 weighted vinyl aromatic monomer and 45 to 5 weight % conjugated diene monomer, wherein the polymerizing is conducted using a charge sequence of the following order: (a) a vinyl aromatic monomer, a polar organic compound, polymerization solvent and an anionic initiator to prepare an anionic polymer block; (b) a multifunctional vinyl aromatic compound and a conjugated diene monomer being added to the anionic polymer block to prepare a mikto block of polymer having a combined linear and nonlinear structure; (c) a conjugated diene monomer; (d) a vinyl aromatic monomer; and (e) a multifunctional coupling agent.