Patent ID: 7767124

Claim:
A method of treating a polymer compound wherein the polymer compound and a chemical agent are kept at a high temperature and a high pressure in a supercritical state, a sub-supercritical state or a state close to the sub-supercritical state, comprising: mixing and agitating the polymer compound and the chemical agent in an extruder while controlling the inside of the extruder to be kept at the high temperature and the high pressure in the supercritical state, the sub-supercritical state or the state close to the sub-supercritical state to react the polymer compound with the chemical agent to have a reaction mixture comprising a polymer treated product and the chemical agent; supplying the reaction mixture continuously into a high-pressure container disposed following the extruder and retaining the reaction mixture at the high temperature and high pressure in the supercritical state, the sub-supercritical state or the state close to the sub-supercritical state for a predetermined time; then supplying the reaction mixture comprising the polymer treated product and the chemical agent and being discharged from the high-pressure container continuously to a chemical agent separator separate from the high-pressure container under a pressure lower than the internal pressure of the high-pressure container to separate the polymer treated product from the chemical agent; and supplying the separated polymer treated product discharged from the chemical agent separator continuously to a molding means separate from the chemical agent separator to form the polymer treated product into a molded material.