The present invention relates to a powder of spherical crosslinkable polyamide particles, which is suitable for the selective laser sintering (SLS) technique, and also to a process for obtaining such a powder of spherical crosslinkable polyamide particles. The present invention also relates to the production of articles by SLS, followed by a crosslinking step, using said powder of spherical crosslinkable polyamide particles.

A polymer composition can be used for selective absorbing sintering, SAS, or selective inhibition sintering, SIS. The polymer has open mesopores and the cumulative pore volume distribution of the mesopores, measured to DIN 66134, is at least 0.01 cm.sup.3/g.

Processes for preparing a polyamide, a polyamide material obtained by such processes, a nylon salt to be used therein, and processes for making the nylon salt are disclosed. The processes for preparing the polyamide include a direct solid state polymerization process. The salt used herein is a granulate material, prepared by a process, comprising spraying an aqueous solution comprising a diamine and a dicarboxylic acid dissolved in an aqueous medium, or an aqueous slurry comprising a diammonium dicarboxylate salt dispersed in an aqueous medium directly obtained from such an aqueous solution, onto or in a fluidized bed of diammonium dicarboxylate salt particles, while evaporating the aqueous medium, thereby forming a granulate salt material.

A method for producing a modifier for preparing a composite material based on a thermoplastic polymer where the thermoplastic polymer is mixed with a solvent and salts of alkali metals with the following ratio of components (wt. %): thermoplastic polymer—3-15, solvent—70-94, salts of alkali metals—3-15, until the polymer is fully dissolved, and then carbon nanotubes are added to the mixture in an amount up to 5 wt. % while stirring to produce a dispersion, then a coagulant is added to the dispersion under continuous stirring, the resulting dispersion is then filtered, and the filter cake is rinsed and dried up. The solvent is selected from the group of: alcohol, or N-methylpyrrolidone, or dimethylacetamide. The alkali metal salt is lithium chloride or calcium chloride. The carbon nanotubes are single-wall carbon nanotubes.

Provided is an amorphous polyamide resin that has a small weight change rate under hot and humid conditions and that can maintain a good appearance even when formed into a molded article and placed under hot and humid conditions. Also provided is a molded article including the amorphous polyamide resin. An amorphous polyamide resin includes: constituent units derived from a diamine and constituent units derived from a dicarboxylic acid, not less than 70 mol % of the constituent units derived from a diamine being constituent units derived from isophoronediamine, the constituent units derived from a dicarboxylic acid including constituent units derived from an α,ω-straight chain aliphatic dicarboxylic acid having from 8 to 14 carbons and constituent units derived from an aromatic dicarboxylic acid.

To provide a metal-fiber reinforced plastic composite material which exhibits favorable impregnation of a matrix resin into a reinforcing fiber substrate and favorable adhesion to metal members, and excellent mechanical properties. The metal-fiber reinforced plastic composite material is a laminate of a metal member and a fiber reinforced plastic, wherein the fiber reinforced plastic includes a reinforcing fiber substrate (A) and a thermoplastic resin composition (B), the thermoplastic resin composition (B) contains a phenoxy resin (B-1) and a polyamide resin (B-2) at a mass ratio (B-1)/(B-2) of 80/20 to 20/80, an adhesive strength of the thermoplastic resin composition (B) to a monofilament of the reinforcing fiber substrate (A) is 40 MPa or more as an interfacial shear strength at 23° C. in a microdroplet method, and an adhesive strength between the metal member and the thermoplastic resin composition (B) is 7.0 MPa or more as a tensile shear strength at 23° C.

The present invention aims to provide a method for producing a glass-fiber-reinforced polyamide resin composition which can stably provide a molded product that has excellent weather resistance, and has a highly excellent appearance (textured surface uniformity). According to the present invention, there is provided a method for producing a glass-fiber-reinforced polyamide resin composition by using an extruder, wherein the composition contains a crystalline aliphatic polyamide resin (A), an amorphous polyamide resin (B), an acrylic resin (C), mica (D), glass fiber (E) and a master batch of carbon black (F) in a specific ratio by mass, respectively, wherein the composition further contains a specific amount of a copper compound (G), and wherein the extruder has a supply port for raw materials, a side-feeder, and a discharge port, which are arranged in this order from an upstream side being a raw material-supply side, characterized in that, the ingredients (A), (B), (C) and (F) as well as a dispersion of the ingredient (G) are supplied to the extruder from the supply port for raw materials, and the ingredients (D) and (E) are supplied to the extruder from the side-feeder.

The present invention aims to provide a glass-fiber-reinforced polyamide resin composition, characterized in that, the composition contains a crystalline aliphatic polyamide resin (A), an amorphous polyamide resin (B), an acrylic resin (C), mica (D), glass fiber (E) and a master batch of carbon black (F) in a ratio by mass of (17 to 30):(10 to 16):(3 to 8):(10 to 25):(20 to 50):(1 to 8), respectively, in that, a mass ratio of (A) and (B) ((B)/(A)) satisfies 0.50 to 0.61, and in that, the composition further contains a copper compound (G) in a rate of 0.005 to 1.0 part by mass when a total amount of the ingredients (A) to (F) is taken as 100 parts by mass. From the glass-fiber-reinforced polyamide resin composition, it is possible to obtain a molded product that is highly excellent in a surface appearance (textured surface uniformity) and has a weather resistance in a level being enough for maintaining an excellent surface appearance even after the weathering test.

The embodiments relate to a polyamide-based film excellent in optical properties such as transmittance, haze, and yellow index and mechanical properties such as modulus and thickness uniformity, to a process for preparing the same, and to a cover window and a display device comprising the same. The polyamide-based film comprises a polyamide-based polymer and has an XRD pattern comprising a first peak whose highest point is located in a section where 2θ is 14° to 16°.

A type of composite material where the matrix material and additive are held together by covalently or non-covalently bound ligands is described. A particularly useful composite material covered by the present invention is a carbon nanotube-reinforced composite material where the matrix consists of a polymer, covalently attached to a linker, where said linker is non-covalently attached to the carbon nanotube. Methods for the preparation of such composite materials are provided.