| abstract |
(57) [Abstract] [PROBLEMS] To provide a method for producing a polyvinyl chloride resin composition having excellent compression set and heat aging resistance. [Structure] Polyvinyl chloride polymer (1), polymer polyol (2), and compound (3) having three or more isocyanate groups are melt mixed under shear stress, and the amount of unreacted isocyanate groups remaining is less than 5%. The method for producing a polyvinyl chloride-based resin composition, which comprises urethanizing the mixture until the reaction is carried out, and then mixing and kneading the hydrotalcite-based compound (4) treated with perchloric acid. |