Carbon-fiber-precursor acrylic fiber bundle with oil composition adhering thereto, process for producing the same, oil composition for carbon-fiber-precursor acrylic fiber, and oil composition dispersion for carbon-fiber-precursor acrylic fiber

A carbon-fiber-precursor acrylic fiber bundle with an oil composition adhering thereto, wherein:

• the oil composition comprises an amino-modified silicone, an aromatic ester compound (1) having a structure of formula (1):
• and an aromatic ester compound (2) having a structure of formula (2):
• an adhesion amount of the amino-modified silicone is from 0.01 to 0.2% by mass relative to a mass of the dry fiber,
• a total adhesion amount of the aromatic ester compound (1) and the aromatic ester compound (2) is from 0.4 to 1.2% by mass relative to the mass of the dry fiber,
• a ratio of the adhesion amounts of the aromatic ester compound (2) to the aromatic ester compound (1) is from 0.25 to 6.5,
• R1 and R2 are each independently a hydrocarbon group having 7 to 21 carbon atoms,
• m and n are each independently an integer of from 1 to 5, and
• R3, R4, and R5 are each independently a hydrocarbon group having 8 to 10 carbon atoms.