Agent for treating carbon fiber precursor and use thereof

Abstract

The purpose of the present invention is to provide an agent for treating a carbon fiber precursor, the agent being capable of suppressing degradation of the carbon fiber precursor even when the carbon fiber precursor produced by applying the agent for treating a carbon fiber precursor is stored for a long period of time, and being capable of obtaining carbon fibers having excellent physical properties even when the carbon fiber precursor stored for a long period of time is used.　This agent for treating a carbon fiber precursor contains (A) a silicone having an amino group, (B) a silicone having an aryl group, and (C1) an aliphatic (poly)oxyalkylene derivative. The weight ratio (B / A) of the silicone (B) having an aryl group to the silicone (A) having an amino group is preferably 1 or less.