The object of the present invention is to provide a production method which makes it possible to obtain a PHA with a simple operation. The object can be attained by providing a method for producing a polyhydroxyalkanoate, the method including the steps of: (a) preparing an aqueous polyhydroxyalkanoate suspension having a pH of not more than 7; and (b) heating the aqueous polyhydroxyalkanoate suspension, prepared in the step (a), at a temperature set at 80° C. to 300° C. in a twin screw extruder so as to aggregate a polyhydroxyalkanoate.

Polymer particles that comprise a thermoplastic polymer and a nucleating agent may be useful in additive manufacturing methods where warping may be mitigated. For example, a method of producing sais polymer particles may comprise: a thermoplastic polymer, a nucleating agent, a carrier fluid, and optionally an emulsion stabilizer at a temperature at or greater than a melting point or softening temperature of the thermoplastic polymer to emulsify a thermoplastic polymer melt in the carrier fluid; cooling the mixture to form polymer particles; and separating the polymer particles from the carrier fluid, wherein the polymer particles comprise the thermoplastic polymer, the nucleating agent, the emulsion stabilizer, if included, and wherein the polymer particles have a crystallization temperature that is substantially the same as a crystallization temperature of the thermoplastic polymer prior to mixing.

The present disclosure relates to water-absorbent resin particles in which a contact angle of 0.9% by mass saline at 25° C.±2° C. is 100 degrees or larger, and an absorbent material containing the water-absorbent resin particles.

A method for producing silica-coated spherical silicone elastomer particles which includes a step in which a tetraalkoxysilane (E) is added to a liquid comprising spherical silicone elastomer particles (A), an alkaline substance (B), one or more ingredients (C) selected from among cationic surfactants and cationic water-soluble polymers, and water (D), and the tetraalkoxysilane is hydrolyzed and condensed to thereby coat the surfaces of the spherical silicone elastomer particles with silica.

A method for producing a nitrile rubber, includes recovering a nitrile rubber from a latex of nitrile rubber by continuously feeding the latex of nitrile rubber and a coagulant into an extruder including a screw disposed inside a barrel to be rotatably driven, wherein the latex of nitrile rubber fed into the extruder contains 0.1 to 3 parts by weight of a hindered phenol-based antiaging agent having a molecular weight of 300 to 3000 relative to 100 parts by weight of the nitrile rubber.

A method for producing a nitrile rubber, includes recovering a nitrile rubber from a latex of nitrile rubber by continuously feeding the latex of nitrile rubber and a coagulant into an extruder including a screw disposed inside a barrel to be rotatably driven, wherein the latex of nitrile rubber fed into the extruder contains 0.1 to 3 parts by weight of a hindered phenol-based antiaging agent having a molecular weight of 300 to 3000 relative to 100 parts by weight of the nitrile rubber.

Disclosed herein are polysaccharide-elastomer masterbatch compositions and processes for preparing the masterbatch compositions. One method comprises a step of a) mixing i) an aqueous polysaccharide dispersion, or ii) a basic aqueous polysaccharide solution, with a rubber latex solution containing a rubber component to form a mixture. The method further comprises the steps of: b) coagulating the mixture obtained in step a) to produce a coagulated mass; and c) drying the coagulated mass obtained in step b). The masterbatch compositions are useful in preparing rubber-containing articles.

Disclosed herein are polysaccharide-elastomer masterbatch compositions and processes for preparing the masterbatch compositions. One method comprises a step of a) mixing i) an aqueous polysaccharide dispersion, or ii) a basic aqueous polysaccharide solution, with a rubber latex solution containing a rubber component to form a mixture. The method further comprises the steps of: b) coagulating the mixture obtained in step a) to produce a coagulated mass; and c) drying the coagulated mass obtained in step b). The masterbatch compositions are useful in preparing rubber-containing articles.

A method for producing a polyhydroxyalkanoate, the method including: (a) preparing an aqueous polyhydroxyalkanoate suspension having a pH of not more than 5; (b) mixing the aqueous suspension obtained in (a) with a water-insoluble organic solvent having a specific gravity of more than 1.0 g/mL; (c) separating a mixed solution obtained in (b) into a water-insoluble organic solvent phase and an aqueous phase by centrifugal separation, and then removing the aqueous phase; and (d) heating the water-insoluble organic solvent phase obtained in (c), and then cooling the water-insoluble organic solvent phase to obtain a gelatinous polyhydroxyalkanoate.

A method for treating biomass to manufacture biomass beads adapted to an implementation in a gasification method, the method comprising the following steps: a) providing a biomass powder, for example a wood bark powder, the particle size of the biomass powder preferably being less than 200 μm, b) providing an alginate solution comprising water and alginate, for example potassium alginate or sodium alginate, c) adding the biomass powder to the alginate solution and mixing, whereby a colloidal suspension is formed, d) dropwise adding the colloidal suspension to an ionotropic coagulation bath comprising multivalent ions, whereby biomass beads are formed.