The invention relates to a solvent composition containing a mixture of at least one molecule having at least one sulphoxide function and at least one molecule having at least one amide function wherein the nitrogen atom supports a hydrogen atom. The invention also relates to the use of the solvent composition in order to stabilise polymer solutions. The invention also relates to a polymer solution containing the solvent composition and to a filtering membrane and an artificial leather obtained from the polymer solution.

Ways of preparing a partially crystalline polycarbonate powder are provided that include dissolving an amorphous polycarbonate in a polar aprotic solvent to form a first solution of solubilized polycarbonate at a first temperature. The first solution is then cooled to a second temperature, the second temperature being lower than the first temperature, where a portion of the solubilized polycarbonate precipitates from the first solution to form a second solution including the partially crystalline polycarbonate powder. Certain partially crystalline polycarbonate powders resulting from such methods are particularly useful in additive manufacturing processes, including powder bed fusion processes.

A process is described for the preparation of a homogeneous spinning solution for the production of acrylic or modacrylic fibers which comprises the following steps: i) preparation of an intimate mixture of a homopolymer or copolymer of acrylonitrile in powder form with a solid solvent in powder form, at a temperature lower than the melting point of the solid solvent; ii) gradually heating the intimate mixture of solids coming from step i) to a temperature ranging from 70 C. to 150 C. in a time ranging from 0.5 to 30 minutes, until the complete dissolution of the homopolymer or copolymer in the solvent and the formation of a homogeneous spinning solution. Said spinning solution is then fed to a storage tank or to the spinning line.

A polar solvent solution of the present invention is a polar solvent solution in which a solute containing a polyamine acid is dissolved in a polar solvent. An inorganic salt is added to the solution, and a mole ratio of moisture to the inorganic salt in the solution is 2.5mn or less, where m represents the number of cations forming the inorganic salt and n represents a charge number of the cation. A production method of the present invention is a method for producing the above solution, including: changing at, least one of a moisture content and a content of the inorganic salt in the solution to adjust a viscosity of the solution. Thus, the present invention provides a polar solvent solution whose viscosity can be easily adjusted to a desired value and thus enables stable spinning and casting when used as dopes for spinning, film, etc., and methods for producing the same.

Disclosed are injectable compositions. Such compositions may be formed from cellulosic fibers and a deep eutectic solvent. Also disclosed are methods of preparing an injectable composition, which comprises: (i) contacting cellulosic fibers with a deep eutectic solvent to provide deep eutectic solvent treated cellulosic fibers; (ii) washing the deep eutectic solvent treated cellulosic fibers; and (iii) homogenizing or mechanically refining the washed deep eutectic solvent treated cellulosic fibers to thereby provide the injectable composition. Also disclosed are uses of the compositions and methods involving the compositions.

A porous polybenzimidazole (PBI) particulate resin is disclosed. This resin is easily dissolved at ambient temperatures and pressures. The resin is made by: dissolving a virgin PBI resin in a highly polar solvent; precipitating the dissolved PBI in a bath; and drying the precipitated PBI, the dried precipitated PBI being porous. The porous PBI resin may be dissolved by: mixing a porous PBI resin with a highly polar solvent at ambient temperatures and pressures to form a solution.

The present disclosure relates to a polysulfide copolymer particle and a method of preparing the polysulfide copolymer particle.

Dispersion and method for the production of same. In one embodiment, the dispersion consists of a dispersing liquid and at least one solid substance that is distributed in the dispersing liquid. In order to obtain a dispersion with particularly good properties, it is provided that the dispersing liquid has an aqueous and/or non-aqueous base, that the at least one solid substance is formed of graphite and/or of carbon nanomaterial and/or of coke and/or of porous carbon, and that the at least one solid substance is distributed homogeneously and stably in the dispersing liquid. A method for the production of such a dispersion is provided such that the dispersion is produced by applying a strong accelerating voltage. In addition, various advantageous uses of such a dispersion are indicated.

The present disclosure relates to a process for producing homogeneous solutions comprising dissolved polyacrylonitrile-based polymer, and a system suitable therefor. The homogeneous polymer solutions produced by the process described herein may be used for producing carbon fiber, typically carbon fiber used in manufacturing composite materials.

The present disclosure relates to a process for producing homogeneous solutions comprising dissolved polyacrylonitrile-based polymer, and a system suitable therefor. The homogeneous polymer solutions produced by the process described herein may be used for producing carbon fiber, typically carbon fiber used in manufacturing composite materials.