Process for Production of Polybenzazole Polymer and the Polymer

摘要

PROBLEMS The present invention relates to a process for producing a polybenzoxazole polymer and provides a process for producing the polybenzoxazole polymer within a short reaction time. MEANS FOR SOLVING PROBLEMS A process for producing a polybenzazole polymer comprises producing the polybenzazole polymer in a non-oxidizing dehydrating solvent while employing a compound represented by the following general formula (1) as a raw material including a first polymerization step in which polymerization is performed at a temperature of 150° C. or less and a latter polymerization step in which polymerization is performed at a temperature of 200° C. or more, wherein at least the latter polymerization step is performed in a kneading-type reaction apparatus to complete the polymerization reaction: wherein X represents an O atom, an S atom or an NH group; Ar₁ represents a tetravalent organic group having two or less of benzene rings, naphthalene rings or pyridine rings; Ar₂ represents a bivalent organic group having two or less of benzene rings, naphthalene rings or pyridine rings; both of Ar₁ and Ar₂ may have one or more functional groups such as a methyl group and a hydroxyl group; and R represents H or a univalent organic group with a carbon number of 1 to 6.