To provide a method for producing an aqueous polytetrafluoroethylene dispersion, whereby the formation of fluorinated oligomers as byproducts is minimized, CFT of the formed coating film is large, and a highly concentrated aqueous polytetrafluoroethylene dispersion is easily obtainable. The method for producing an aqueous polytetrafluoroethylene dispersion, which comprises step A1 of polymerizing a non-fluorinated monomer in an aqueous medium to obtain a solution 1 containing a polymer containing units based on the non-fluorinated monomer, step A2 of conducting polymerization of tetrafluoroethylene in the solution 1 without substantially adding a surfactant to the solution 1, to obtain an aqueous emulsion containing polytetrafluoroethylene particles, and step A3 of adding a nonionic surfactant to the aqueous emulsion at a rate of from 10 to 150 mass % to the mass of PTFE contained in the aqueous emulsion, and subsequently concentrating the aqueous emulsion to obtain an aqueous polytetrafluoroethylene dispersion, wherein the amount of the non-fluorinated monomer used, to the amount of the tetrafluoroethylene supplied to the polymerization system, is at most 200 mass ppm.

The present invention provides a solvent-free viscoelastic RSF liquid by modifying the RSF surface with polyethylenimine and polyethylene glycol-based polymer surfactant, which surrounds each RSF molecule by forming a dual shell and thereby minimizes the inter RSF interactions and thus prevents formation of β-sheet aggregation. The engineering of RSF surface with PEI and PS significantly improved the conformational stability and storage time of RSF liquid compared to native RSF as silk I conformation of RSF liquid remained intact for more than 8 months.

The present invention provides a solvent-free viscoelastic RSF liquid by modifying the RSF surface with polyethylenimine and polyethylene glycol-based polymer surfactant, which surrounds each RSF molecule by forming a dual shell and thereby minimizes the inter RSF interactions and thus prevents formation of β-sheet aggregation. The engineering of RSF surface with PEI and PS significantly improved the conformational stability and storage time of RSF liquid compared to native RSF as silk I conformation of RSF liquid remained intact for more than 8 months.

Embodiments of an invention disclosed herein relate to devices, processes, and systems for processing one or more polymers.

Embodiments of an invention disclosed herein relate to devices, processes, and systems for processing one or more polymers.

The present invention relates to a vinyl chloride-based polymer showing high viscosity properties in a low shear region and showing viscosity and stress decreasing properties in line with the increase of a shear rate, a method for preparing the same, and a plastisol comprising the same. Since the vinyl chloride-based polymer comprises a saponified emulsifier in a specific ratio, high viscosity properties may be shown in a low shear region, and Bingham fluid flow properties may be shown, by which viscosity and stress decrease in line with the increase of a shear rate.

The present invention relates to a vinyl chloride-based polymer showing high viscosity properties in a low shear region and showing viscosity and stress decreasing properties in line with the increase of a shear rate, a method for preparing the same, and a plastisol comprising the same. Since the vinyl chloride-based polymer comprises a saponified emulsifier in a specific ratio, high viscosity properties may be shown in a low shear region, and Bingham fluid flow properties may be shown, by which viscosity and stress decrease in line with the increase of a shear rate.

Polymer particles excellent in uniform dispersibility and the use thereof are provided. The polymer particles contain a surfactant, and have a coefficient of variation in the volume-based particle diameter distribution in the range from not less than 13.0% to not more than 25.0%. When 15.0 g of water is added to 5.0 g of the polymer particles so as to disperse the polymer particles in the water by performing a dispersion treatment for 60 minutes using an ultrasonic cleaner, and furthermore when an obtained dispersion liquid is put into a centrifuge tube with an inside diameter of 24 mm so as to be centrifuged, by a centrifugal separator, under conditions that K factor is 6943 and a rotating time is 30 minutes to recover a supernatant, a concentration of non-volatile components in the obtained supernatant is less than 3.5 wt. %.

Polymer particles excellent in uniform dispersibility and the use thereof are provided. The polymer particles contain a surfactant, and have a coefficient of variation in the volume-based particle diameter distribution in the range from not less than 13.0% to not more than 25.0%. When 15.0 g of water is added to 5.0 g of the polymer particles so as to disperse the polymer particles in the water by performing a dispersion treatment for 60 minutes using an ultrasonic cleaner, and furthermore when an obtained dispersion liquid is put into a centrifuge tube with an inside diameter of 24 mm so as to be centrifuged, by a centrifugal separator, under conditions that K factor is 6943 and a rotating time is 30 minutes to recover a supernatant, a concentration of non-volatile components in the obtained supernatant is less than 3.5 wt. %.

An object of the invention is to provide a material comprising ultrafine cellulose fibers, having good dispersibility of fine particles in an aqueous medium containing ultrafine cellulose fibers. According to the invention, there is provided a material comprising ultrafine cellulose fibers, wherein the content of the ultrafine cellulose fibers is 80% by mass or more, and the haze value of a sample, which has been prepared by adding the material comprising ultrafine cellulose fibers to pure water to a solid concentration of 0.4% by mass, and stirring the mixture with a disperser under conditions of 1500 rpm and 5 minutes, is 20% or less.