METHOD FOR PREPARING ANIONIC POLYMER USING REACTION-STOPPING AGENT WHICH IS RESISTANT TO DISCOLORATION

摘要

PURPOSE: A method for preparing an anionic polymer using a reaction-stopping agent which reduces discoloration of rubber in preparing a butadiene rubber or a styrene-butadiene rubber and is effective to keep a pure color for a long time is provided. CONSTITUTION: In the method for preparing a high molecular materials by anionic polymerization, a dispersant of a maleic anhydride diisobutylene polymer sodium salt represented by of the following formula 1 is partially acidified to be used as a reaction stopping-agent in an agglutination step and then adding calcium chloride to a solution containing the maleic anhydride diisobutylene polymer sodium salt in a process of agglutination.