PROBLEM TO BE SOLVED: To provide an oil agent for a carbon fiber precursor acrylic fiber, an oil agent composition for a carbon fiber precursor acrylic fiber, and an oil agent treatment liquid for a carbon fiber precursor acrylic fiber that are capable of effectively preventing fusion between single fibers in a carbon fiber bundle production process, suppressing an operability decline, and obtaining a carbon fiber precursor acrylic fiber bundle having good collectability and a carbon fiber bundle having excellent mechanical properties with good productivity.;SOLUTION: There are provided: an oil agent for a carbon fiber precursor acrylic fiber that is obtained by a condensation reaction of a cyclohexanedicarboxylic acid and an 8-22C monovalent aliphatic alcohol, or a condensation reaction of a cyclohexanedicarboxylic acid, an 8-22C monovalent aliphatic alcohol and a 2-10C polyhydric alcohol and/or a polyoxyalkylene glycol having a 2-4C oxyalkylene group; an oil agent composition for a carbon fiber precursor acrylic fiber containing the oil agent; and an oil agent treatment liquid for a carbon fiber precursor acrylic fiber in which the oil agent composition is dispersed in water.;COPYRIGHT: (C)2013,JPO&INPIT
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