Method for producing composition

Abstract

A method for producing a composition containing an olefin-based polymer A and a polyhydroxyalkanoate-based polymer B, the composition containing 99.9 to 70 parts by mass of the olefin-based polymer A and 0.1 to 30 parts by mass of the polyhydroxyalkanoate-based polymer B when a total amount of the olefin-based polymer A and the polyhydroxyalkanoate-based polymer B is 100 parts by mass, includes a step of supplying a material 1 containing an olefin-based polymer A from a main feed port of an extruder to the extruder and melting and kneading the material 1, and a step of supplying a material 2 containing a polyhydroxyalkanoate-based polymer B from a side feed port disposed downstream of the main feed port in the extruder to the extruder and melting and kneading the material 2.

Dependencies are inferred from the claim text.