The present disclosure is directed to provide a hollow fiber which is lightweight and has a texture with good volumic feel and good cushioning property. The hollow fiber of the present disclosure is a hollow fiber composed of a composition containing a vinylidene chloride-based resin as a main component, wherein the hollow fiber has a hollow ratio of more than 30% and 70% or less, an average outer diameter of 50 to 900 m, a strength of 0.7 to 2 g/d, and a heat shrinkage rate after being heated at 100 C. for 15 minutes of 30% or less.

Provided is a carbon fiber that has an average fiber diameter of 1-100 m and is a product obtained by spinning a solution of chlorinated polyvinyl chloride to obtain a chlorinated polyvinyl fiber, elongating the chlorinated polyvinyl fiber without an oxidative stabilization process, and then preheating and carbonizing the elongated polyvinyl chloride fiber. Also, provided is a method for preparing a carbon fiber which has excellent mechanical properties and a high degree of orientation without oxidative stabilization.

Acrylic compositions comprising a hindered amine light stabilizer are described herein. The acrylic composition may be in the form of a fiber, thread, yarn, and/or fabric. Also described herein are methods of making and using the acrylic compositions and articles comprising an acrylic composition as described herein.

A method for manufacturing an acrylic fiber uses a spinning solution in which an acrylic polymer is dissolved in an organic solvent, the method including reducing an amount of organic solvent by repeatedly spraying water onto coagulated filaments obtained by solidifying the spinning solution and pressing the coagulated filaments with nip rolls. The nip rolls may apply a nip pressure of 0.2 MPa or higher. Thus, a method for manufacturing an acrylic fiber with which an organic solvent in the acrylic fiber can be removed within a short period of time without using a water bath is provided.

A method for manufacturing an acrylic fiber uses a spinning solution in which an acrylic polymer is dissolved in an organic solvent, the method including reducing an amount of organic solvent by repeatedly spraying water onto coagulated filaments obtained by solidifying the spinning solution and pressing the coagulated filaments with nip rolls. The nip rolls may apply a nip pressure of 0.2 MPa or higher. Thus, a method for manufacturing an acrylic fiber with which an organic solvent in the acrylic fiber can be removed within a short period of time without using a water bath is provided.

A polyvinyl chloride-based fiber for artificial hair that has excellent low glossiness and grip performance when woven and can be stably spun. Configuring a fiber for artificial hair using a polyvinyl chloride-based resin composition, wherein the polyvinyl chloride-based resin includes, at predetermined blending amounts, a polyvinyl chloride-based resin (A) having a viscosity-average polymerization degree of 450-1,700 and a crosslinked vinyl chloride-based resin (B) in which the viscosity-average polymerization degree of a component that dissolves in tetrahydrofuran is 1,800-2,300, the difference between the viscosity-average polymerization degree of the polyvinyl chloride-based resin (A) and the viscosity-average polymerization degree of the THF-soluble component of the crosslinked vinyl chloride-based resin (B) is in a predetermined range, and the cross-sectional shape of the fiber for artificial hair has a first projection, a second projection, and a third projection and the lengths and widths thereof satisfy predetermined conditions.

A fiber for artificial hair, having a base fiber, a metal ion, and an antistatic agent, in which the metal ion and the antistatic agent are present in at least a part of a surface of the base fiber, the metal ion is at least one selected from the group consisting of a silver ion, a zinc ion, and a copper ion, a content of the metal ion is 5.010.sup.5 to 1.010.sup.2% by mass based on the total mass of the fiber for artificial hair, the antistatic agent is at least one selected from the group consisting of a cationic antistatic agent and a non-ionic antistatic agent, and a content of the antistatic agent is 0.001 to 1% by mass based on the total mass of the fiber for artificial hair.

A fiber for artificial hair, having a base fiber, a metal ion, and an antistatic agent, in which the metal ion and the antistatic agent are present in at least a part of a surface of the base fiber, the metal ion is at least one selected from the group consisting of a silver ion, a zinc ion, and a copper ion, a content of the metal ion is 5.010.sup.5 to 1.010.sup.2% by mass based on the total mass of the fiber for artificial hair, the antistatic agent is at least one selected from the group consisting of a cationic antistatic agent and a non-ionic antistatic agent, and a content of the antistatic agent is 0.001 to 1% by mass based on the total mass of the fiber for artificial hair.

A filament for three-dimensional printing comprises a thermoplastic resin and an acrylic polymer additive in an amount ranging from 0.1 to 20 parts per hundred of the thermoplastic resin (phr). A 3D printed article prepared from the filament and a process for preparing filament for three-dimensional printing are also disclosed.

A filament for three-dimensional printing comprises a thermoplastic resin and an acrylic polymer additive in an amount ranging from 0.1 to 20 parts per hundred of the thermoplastic resin (phr). A 3D printed article prepared from the filament and a process for preparing filament for three-dimensional printing are also disclosed.