METHOD FOR PRODUCING LOW-MOLECULAR WEIGHT POLYMER, LOW-MOLECULAR WEIGHT POLYMER, METHOD FOR PRODUCING TONER AND TONER

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a high-purity low-molecular weight polymer inexpensively and efficiently. SOLUTION: This method for producing a low-molecular weight polymer comprises using a styrenic monomer alone as a monomer raw material or the styrenic molecule as a main component and a (meth)acrylic acid ester-based monomer and/or another vinyl-based monomer as monomer raw materials and feeding the whole amount or a part of the monomer raw material and a radical polymerization initiator to a polymerization reaction system. The method for producing the low-molecular weight polymer comprises feeding the whole amount of the radical polymerization initiator dividedly plural times so as to make a feeding time Ta and a nonfeeding time Tna satisfy the formula (1) Ta