Takemoto Yushi Kabushiki Kaisha

Akihiro Doi

Keiichiro Oshima

Takeshi Nishigawa

An aqueous liquid of a carbon fiber precursor treatment agent contains a carbon fiber precursor treatment agent and water, the carbon fiber precursor treatment agent containing an amino-modified silicone and a particular nonionic surfactant having a molecular weight distribution (Mw/Mn) of from 1.05 to 1.50. The amino-modified silicone may have a kinematic viscosity at 25° C. of 50 to 4,000 mm/s. The carbon fiber precursor treatment agent is adhered to a carbon fiber precursor.

Aqueous liquid of treatment agent for carbon fiber precursors, and carbon fiber precursor

Carbon fiber precursor treatment agents include a nonionic surfactant, an amino-modified silicone, and a dimethyl silicone with a kinematic viscosity at 25&#xb0; C. of 5 to 200 mm/s. The mass ratio of the content of the amino-modified silicone with respect to the content of the dimethyl silicone is 99.9/0.1 to 90/10. Alternatively, when the total content of the nonionic surfactant, the amino-modified silicone, and the dimethyl silicone is taken as 100 parts by mass, the nonionic surfactant is contained at a ratio of 9 to 85 parts by mass, the amino-modified silicone is contained at a ratio of 10 to 90.9 parts by mass, and the dimethyl silicone is contained at a ratio of 0.1 to 5 parts by mass.

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Akihiro Doi