Disclosed is a carbon fiber precursor treatment agent that contains a specific (poly)oxyalkylene derivative and a smoothing agent. The smoothing agent contains at least one selected from the group consisting of an amino-modified silicone, a polyether-modified silicone, a dimethyl silicone, and an ester compound. Assuming that the sum of the content ratios of the (poly)oxyalkylene derivative and the smoothing agent in the carbon fiber precursor treatment agent is 100% by mass, the carbon fiber precursor treatment agent contains the (poly)oxyalkylene derivative at a ratio of 5% by mass or more and 80% by mass or less and the smoothing agent at a ratio of 20% by mass or more and 95% by mass or less.

A hydrophilized cellulose acetate tow band according to the present invention includes a crimped cellulose acetate tow band, and a hydrophilizing component having an HLB value of 16 or more. The cellulose acetate tow band includes a cellulose acetate having a degree of substitution of 2.0 to 2.6. The cellulose acetate tow band has a total denier of 10000 to 40000 and is crimped in a number of crimps of 30 to 60 per inch. The hydrophilizing component is impregnated on the cellulose acetate tow band in an amount of 0.2 to 2 weight percent relative to the cellulose acetate tow band. The hydrophilized cellulose acetate tow band may further include a textile oil, where the textile oil is impregnated on the crimped cellulose acetate tow band in an amount of 0.2 to 2 weight percent relative to the cellulose acetate tow band, in addition to the hydrophilizing component having an HLB value of 16 or more.

Sizing agent-coated reinforcing fibers include reinforcing fibers and a sizing agent containing a polyrotaxane, the reinforcing fibers being coated with the sizing agent. Provided are sizing agent-coated reinforcing fibers that provide a fiber-reinforced composite material with excellent mechanical properties, a method for producing the sizing agent-coated reinforcing fibers, a prepreg including the sizing agent-coated reinforcing fibers, and a fiber-reinforced composite material with excellent mechanical properties including the sizing agent-coated reinforcing fibers.

Disclosed is an elastic fiber treatment agent that contains a polyether-modified silicone, a smoothing agent other than the polyether-modified silicone, and water. The polyether-modified silicone is contained in the elastic fiber treatment agent at a content of 0.01% by mass or more and 10% by mass or less. The polyether-modified silicone has a hydrophilic-lipophilic balance (HLB) of 1 or more and 7 or less.

Disclosed is an elastic fiber treatment agent that contains a polyether-modified silicone, a smoothing agent other than the polyether-modified silicone, and water. The polyether-modified silicone is contained in the elastic fiber treatment agent at a content of 0.01% by mass or more and 10% by mass or less. The polyether-modified silicone has a hydrophilic-lipophilic balance (HLB) of 1 or more and 7 or less.

The present invention relates generally to methods of producing, using, and storing stable aqueously dispersed superhydrophobic compositions made from these compositions to provide superhydrophobic treatments on a range of porous, semi-porous, and non-porous target materials and surfaces as well as combinations of these materials and surfaces. More particularly, the present invention provides stably dispersed waterborne superhydrophobic compositions comprising colloidal silica or hydrophobically-modified silicon dioxide (i.e., silica) and one or more additional agents and/or compounds. When the compositions of the present invention are applied (e.g., via spray deposition, immersion, liquid application, and the like) to a suitable target material and/or surface the target is imparted with a durable (super)hydrophobic coating.

The present invention relates generally to methods of producing, using, and storing stable aqueously dispersed superhydrophobic compositions made from these compositions to provide superhydrophobic treatments on a range of porous, semi-porous, and non-porous target materials and surfaces as well as combinations of these materials and surfaces. More particularly, the present invention provides stably dispersed waterborne superhydrophobic compositions comprising colloidal silica or hydrophobically-modified silicon dioxide (i.e., silica) and one or more additional agents and/or compounds. When the compositions of the present invention are applied (e.g., via spray deposition, immersion, liquid application, and the like) to a suitable target material and/or surface the target is imparted with a durable (super)hydrophobic coating.

Disclosed is a polyester synthetic fiber treatment agent that contains 5% by mass or more of a (poly) oxyalkylene derivative, 1% by mass or more of an organic acid compound, and 5% by mass or more of an organic phosphoric acid ester compound. A 5% by mass water-diluted liquid of the polyester synthetic fiber treatment agent (containing no solvent) has a pH at 25 C. of 5.5 or more and 8.5 or less. The organic acid compound is at least one selected from the group consisting of an organic acid, an organic acid salt, and an organic acid anhydride. The organic phosphoric acid ester compound is at least one selected from the group consisting of an organic phosphoric acid ester and a salt thereof having a hydrocarbon group with 16 or more and 20 or less carbon atoms in a molecule.

Disclosed is a polyester synthetic fiber treatment agent that contains 5% by mass or more of a (poly) oxyalkylene derivative, 1% by mass or more of an organic acid compound, and 5% by mass or more of an organic phosphoric acid ester compound. A 5% by mass water-diluted liquid of the polyester synthetic fiber treatment agent (containing no solvent) has a pH at 25 C. of 5.5 or more and 8.5 or less. The organic acid compound is at least one selected from the group consisting of an organic acid, an organic acid salt, and an organic acid anhydride. The organic phosphoric acid ester compound is at least one selected from the group consisting of an organic phosphoric acid ester and a salt thereof having a hydrocarbon group with 16 or more and 20 or less carbon atoms in a molecule.

The present invention addresses the problem of providing a synthetic fiber first processing agent which improves storage stability. This synthetic fiber first processing agent contains a phosphate compound (A), a solvent (S) and an optional non-ionic surfactant (C), said agent being characterized in that the content ratio of the phosphate compound (A) to the non-ionic surfactant (C) is within a prescribed range, and by being used in conjunction with a synthetic fiber second processing agent which contains a non-ionic surfactant (E). The phosphate compound (A) contains a prescribed organic phosphate ester compound, and the proton NMR integration ratio attributable to an inorganic phosphate compound during proton NMR measurement when performing an alkali over-neutralization preprocessing is set to a prescribed range. The solvent (S) has a boiling point no higher than 105 C. at atmospheric pressure. The non-ionic surfactant (C) has a (poly)oxyalkylene structure in the molecule thereof.