A method of preparing an acrylonitrile-based copolymer for a carbon fiber. The method includes: preparing a reaction solution including a (meth)acrylonitrile-based monomer and a first reaction solvent; adding a first portion of a radical polymerization initiator to the reaction solution to initiate polymerization; and adding a second portion of the radical polymerization initiator to the reaction solution when a polymerization conversion ratio is between 70 to 80%.

Provided is a resin composition configured to show a small change in the void ratio of hollow resin particles during mold processing and configured to stably mold a lightweight molded product. The resin composition is a resin composition comprising 50 parts by mass to 95 parts by mass of a thermoplastic plastomer and 5 parts by mass to 50 parts by mass of hollow resin particles, wherein the hollow resin particles have a void ratio of from 50% to 85%; wherein the hollow resin particles have a shell containing a resin; and wherein, with respect to 100 parts by mass of repeating units constituting the resin, 30 parts by mass to 100 parts by mass of a crosslinkable monomer unit and 0 part by mass to 70 parts by mass of a non-crosslinkable monomer unit are contained as a polymerizable monomer unit.

Provided is a resin composition configured to show a small change in the void ratio of hollow resin particles during mold processing and configured to stably mold a lightweight molded product. The resin composition is a resin composition comprising 50 parts by mass to 95 parts by mass of a thermoplastic plastomer and 5 parts by mass to 50 parts by mass of hollow resin particles, wherein the hollow resin particles have a void ratio of from 50% to 85%; wherein the hollow resin particles have a shell containing a resin; and wherein, with respect to 100 parts by mass of repeating units constituting the resin, 30 parts by mass to 100 parts by mass of a crosslinkable monomer unit and 0 part by mass to 70 parts by mass of a non-crosslinkable monomer unit are contained as a polymerizable monomer unit.

A flame resistant polymer is obtained by reacting polyacrylonitrile with amine and nitro compounds, the polyacrylonitrile being polymerized by aqueous suspension polymerization using a redox initiator and containing an S component at an amount of 3,000 μg/g or less. A PAN-based polymer in which both yarn producing properties and flame resistance are improved can be realized.

A flame resistant polymer is obtained by reacting polyacrylonitrile with amine and nitro compounds, the polyacrylonitrile being polymerized by aqueous suspension polymerization using a redox initiator and containing an S component at an amount of 3,000 μg/g or less. A PAN-based polymer in which both yarn producing properties and flame resistance are improved can be realized.

A flame resistant polymer is obtained by reacting polyacrylonitrile with amine and nitro compounds, the polyacrylonitrile being polymerized by aqueous suspension polymerization using a redox initiator and containing an S component at an amount of 3,000 μg/g or less. A PAN-based polymer in which both yarn producing properties and flame resistance are improved can be realized.

A high-transparent, thermoplastically processable polymer composition is described. In an exemplary embodiment, the polymer composition includes an acrylate organic polymer. The acrylate organic polymer is a copolymer that can include functional groups of hydrocarbon group up to nine carbon atoms, hydroalkyl group, halogenated hydrocarbon groups, aminoalkyl group, aryl group, cycloalkyl group, and/or a combination thereof. The polymer composition may further include a polysilicon compound, polycarbonate polymer, a polyvinyl polymer, a plasticizer, and/or a combination thereof.

A method and precursor for making carbon fibers and the like comprising carbon black modified with at least one cyclic compound promoter. A source of the carbon black may be recycled materials such as recycled tires or recycled plastics. The carbon black is modified by attaching at least one cyclic compound promoter to the outer periphery of the carbon black.

A method and precursor for making carbon fibers and the like comprising carbon black modified with at least one cyclic compound promoter. A source of the carbon black may be recycled materials such as recycled tires or recycled plastics. The carbon black is modified by attaching at least one cyclic compound promoter to the outer periphery of the carbon black.

The present invention relates to a process for the production of polyacrylonitrile by polymerisation of a reaction mixture comprising acrylonitrile in a solution where the solvent is a eutectic system comprising a quaternary ammonium compound and a hydrogen donor. Such process allows for the production of a polyacrylonitrile having a desirably high molecular weight, whilst polymerisation time is reduced, and where the solvents are environmentally benign, biodegradable and may be reused in the polymerisation process.