A method for producing polyamide particles may include: mixing a mixture comprising a polyamide, a carrier fluid that is immiscible with the polyamide, and nanoparticles at a temperature greater than a melting point or softening temperature of the polyamide and at a shear rate sufficiently high to disperse the polyamide in the carrier fluid; cooling the mixture to below the melting point or softening temperature of the polyamide to form solidified particles comprising polyamide particles having a circularity of 0.90 or greater and that comprise the polyamide and the nanoparticles associated with an outer surface of the polyamide particles; and separating the solidified particles from the carrier fluid.

A method for producing polyamide particles may include: mixing a mixture comprising a polyamide, a carrier fluid that is immiscible with the polyamide, and nanoparticles at a temperature greater than a melting point or softening temperature of the polyamide and at a shear rate sufficiently high to disperse the polyamide in the carrier fluid; cooling the mixture to below the melting point or softening temperature of the polyamide to form solidified particles comprising polyamide particles having a circularity of 0.90 or greater and that comprise the polyamide and the nanoparticles associated with an outer surface of the polyamide particles; and separating the solidified particles from the carrier fluid.

A subject-matter of the present invention are new complexes comprising cyclic alkylene carbonates and polyamides, processes for their preparation and uses. Additionally, a subject-matter of the invention is the use of alkylene carbonates for recycling, solubilization, purification, and/or powdering of polyamide-based materials.

A subject-matter of the present invention are new complexes comprising cyclic alkylene carbonates and polyamides, processes for their preparation and uses. Additionally, a subject-matter of the invention is the use of alkylene carbonates for recycling, solubilization, purification, and/or powdering of polyamide-based materials.

Provided are a method of producing a glass-fiber-reinforced thermoplastic resin molded object by which a special glass-fiber-reinforced thermoplastic resin molded object excellent in mechanical strength and aesthetic appearance can be easily produced, and a glass-fiber-reinforced thermoplastic resin molded object obtained by the method. Glass fiber chopped strands subjected to a surface treatment with at least one of a urethane-based sizing agent and an acrylic urethane-based sizing agent, the glass fiber chopped strands each having a fiber length of from 1.2 mm to 1.8 mm, and a thermoplastic resin are each directly loaded into an injection molding machine, and are subjected to injection molding to produce the following special glass-fiber-reinforced thermoplastic resin molded object. The resin molded object shows a specific fiber length distribution and shows a specific tensile strength, and unopened glass fibers are absent on the surface of the resin molded object.

Provided are a method of producing a glass-fiber-reinforced thermoplastic resin molded object by which a special glass-fiber-reinforced thermoplastic resin molded object excellent in mechanical strength and aesthetic appearance can be easily produced, and a glass-fiber-reinforced thermoplastic resin molded object obtained by the method. Glass fiber chopped strands subjected to a surface treatment with at least one of a urethane-based sizing agent and an acrylic urethane-based sizing agent, the glass fiber chopped strands each having a fiber length of from 1.2 mm to 1.8 mm, and a thermoplastic resin are each directly loaded into an injection molding machine, and are subjected to injection molding to produce the following special glass-fiber-reinforced thermoplastic resin molded object. The resin molded object shows a specific fiber length distribution and shows a specific tensile strength, and unopened glass fibers are absent on the surface of the resin molded object.

A method and a device for the production of polyamide 6 pellets wherein an intermediate drying is not necessary and a combined pelletizing and extraction take place. Depending on the intended use, the pellets may directly be used or subjected to further treatment steps. A device for the production of polyamide 6 pellets includes a melt device for providing a melt of polyamide 6, an underwater pelletizing system which is operable under increased pressure, and a vertical vessel having a cylindrical section and a tapered bottom section. The tapered bottom section is provided with a cooling device and is connected to a pipe comprising a screw and/or a rotary gate valve for conveying pellets. The device includes a circuit for circulating an aqueous solution of ? caprolactam through the underwater pelletizing system and the vertical vessel.

Water dispersible polyamides having carboxylic acid groups are disclosed. These are made by reacting polycarboxyl is acids or anhydrides thereof with amine containing monomer or an amide terminated polyamide under reaction conditions such that a few of the carboxylic acid groups are residual and can promote dispersion in water. These polyamides after dispersion can be chain extended to higher molecular weight polymers or can be terminally functionalized with reactive groups such as isocyanate, epoxy, vinyl, acetoacetonate, or silanol groups. Composites and hybrids of these polyamides with vinyl polymers are also disclosed and claimed.

Water dispersible polyamides having carboxylic acid groups are disclosed. These are made by reacting polycarboxyl is acids or anhydrides thereof with amine containing monomer or an amide terminated polyamide under reaction conditions such that a few of the carboxylic acid groups are residual and can promote dispersion in water. These polyamides after dispersion can be chain extended to higher molecular weight polymers or can be terminally functionalized with reactive groups such as isocyanate, epoxy, vinyl, acetoacetonate, or silanol groups. Composites and hybrids of these polyamides with vinyl polymers are also disclosed and claimed.

The use of ultrasound or acoustics applied at a level below that which causes cavitation to control the energy balance between particles and the liquid phase in a metastable liquid.