| 摘要 |
Provided is a method for stably producing a thermoplastic polymer composition by easily supplying a polyisobutylene having a peak top molecular weight (Mp) of 5,000-80,000 to a hydrogenated block copolymer. Specifically provided is a method for producing a thermoplastic polymer composition containing (a) a hydrogenated block copolymer and (b) a polyisobutylene having a peak top molecular weight (Mp) of 5,000-80,000 in terms of standard polystyrene as determined by gel permeation chromatography, which comprises the following first step and second step. First step: a step for supplying the polyisobutylene (b) to a twin screw/single screw counter-rotating extruder and plasticizing the polyisobutylene (b) Second step: a step having the following step (i) and step (ii) (i) a step for supplying the hydrogenated block copolymer (a) to a twin screw extruder (ii) a step for supplying the polyisobutylene (b) plasticized in the first step to the twin screw extruder via a quantitative pump and kneading the plasticized polyisobutylene (b) together with the hydrogenated block copolymer (a) supplied in the step (i) |
