A method of producing thermoplastic particles may comprise: mixing a melt emulsion comprising (a) a continuous phase that comprises a carrier fluid having a polarity Hansen solubility parameter (dP) of about 7 MPa.sup.0.5 or less, (b) a dispersed phase that comprises a dispersing fluid having a dP of about 8 MPa.sup.0.5 or more, and (c) an inner phase that comprises a thermoplastic polyester at a temperature greater than a melting point or softening temperature of the thermoplastic polyester and at a shear rate sufficiently high to disperse the thermoplastic polyester in the dispersed phase; and cooling the melt emulsion to below the melting point or softening temperature of the thermoplastic polyester to form solidified particles comprising the thermoplastic polyester.

A method of producing thermoplastic particles may comprise: mixing a melt emulsion comprising (a) a continuous phase that comprises a carrier fluid having a polarity Hansen solubility parameter (dP) of about 7 MPa.sup.0.5 or less, (b) a dispersed phase that comprises a dispersing fluid having a dP of about 8 MPa.sup.0.5 or more, and (c) an inner phase that comprises a thermoplastic polyester at a temperature greater than a melting point or softening temperature of the thermoplastic polyester and at a shear rate sufficiently high to disperse the thermoplastic polyester in the dispersed phase; and cooling the melt emulsion to below the melting point or softening temperature of the thermoplastic polyester to form solidified particles comprising the thermoplastic polyester.

Spherical thermoplastic polymer powders useful for additive manufacturing may be made at high throughputs by a method comprising polymer in a dispersing medium at a temperature above the polymer melting temperature (Tm) under shear for short times (e.g., less than 30 minutes) to form a mixture that is then rapid (faster than ambient cooling) cooled below Tm. The method is particularly useful for thermoplastic polymers having a high melt flow index (MFI) or low capillary viscosity at high shear (˜1000 s.sup.−1) within 20 or 30° C. of the polymer's melt temperature. The method may also include a crystallizing temperature below Tm and above the glass transition temperature Tg of the polymer to crystallize amorphous polymers or increase the crystallinity of semi-crystalline polymers.

Spherical thermoplastic polymer powders useful for additive manufacturing may be made at high throughputs by a method comprising polymer in a dispersing medium at a temperature above the polymer melting temperature (Tm) under shear for short times (e.g., less than 30 minutes) to form a mixture that is then rapid (faster than ambient cooling) cooled below Tm. The method is particularly useful for thermoplastic polymers having a high melt flow index (MFI) or low capillary viscosity at high shear (˜1000 s.sup.−1) within 20 or 30° C. of the polymer's melt temperature. The method may also include a crystallizing temperature below Tm and above the glass transition temperature Tg of the polymer to crystallize amorphous polymers or increase the crystallinity of semi-crystalline polymers.

The present invention relates to a method of preparing a graft copolymer powder, which includes: preparing a seed by adding one or more selected from the group consisting of an alkyl (meth)acrylate-based monomer, an aromatic vinyl-based monomer and a vinyl cyan-based monomer to a reactor and carrying out polymerization; preparing a core in the presence of the seed by adding an alkyl (meth)acrylate-based monomer and carrying out polymerization; and preparing a graft copolymer latex in the presence of the core by adding an aromatic vinyl-based monomer and a vinyl cyan-based monomer and carrying out polymerization; adding an alkyl methacrylate-based polymer to the graft copolymer latex and carrying out coagulation, and more particularly, to a method of preparing a graft copolymer powder that is excellent in weather resistance, fluidity, mechanical properties, surface gloss and appearance quality.

The present invention relates to an ethylene-vinyl alcohol copolymer (EVOH) resin composition, an EVOH film formed therefrom, and a multilayer structure containing the same. The core height difference (Sk) of the surface of the EVOH resin composition is between 0.6 and 2.0 μm, and the overall standard deviation of Sk is between 0.05 and 0.55. The invention can reduce the torque output during processing to achieve the effect of energy saving, and can also improve the stability during output to obtain a better film appearance.

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 first embodiment of a method for producing water-absorbent resin particles includes a polymerization step of polymerizing a monomer on at least a part of a surface of a surface-crosslinked polymer particle to obtain a polymer. A second embodiment of a method for producing water-absorbent resin particles includes a polymerization step of polymerizing a monomer on at least a part of a surface of a non-surface-crosslinked polymer particle in the presence of a crosslinking agent to obtain a polymer.

A first embodiment of a method for producing water-absorbent resin particles includes a polymerization step of polymerizing a monomer on at least a part of a surface of a surface-crosslinked polymer particle to obtain a polymer. A second embodiment of a method for producing water-absorbent resin particles includes a polymerization step of polymerizing a monomer on at least a part of a surface of a non-surface-crosslinked polymer particle in the presence of a crosslinking agent to obtain a polymer.