The invention relates to a process for producing shaped articles comprising the steps of: compounding a polymer composition (A) containing a polyamide, a halogen-free melamine based flame retardant and at most 15 wt. % of glass fibers into pellets, compounding a polymer composition (B) containing a polyamide, more than 15 wt. % of glass fibers, and not containing halogen-free melamine based flame retardant into pellets, producing a mixture comprising the pellets of polymer composition (A) and (B), molding the mixture comprising the pellets of polymer composition (A) and (B) into shaped articles.

Thermoplastic polymer compositions are disclosed that demonstrate a flame resistance rating of V-0 at a thickness of 0.8 mm and a Comparative Tracking Index of 600 V. The polymer compositions can contain a glass-reinforced polyester polymer, namely a polybutylene terephthalate polymer. A flame retardant composition is combined with the polymer composition in addition to one or more insulating adjuvants.

The nanoparticles of the present invention consist of a molecular aggregate containing an amphipathic block polymer that has a hydrophilic block and a hydrophobic block. It is preferable that the amphipathic block polymer be biodegradable. The nanoparticles of the present invention are obtained by granulating into particles an amphipathic block polymer in the presence of an amino acid whose isoelectric point is 7 or less. In one embodiment, the granulation is done by bringing a solution containing an amphipathic block polymer or the dried product thereof into contact with an aqueous liquid. Granulation can be done in the presence of an amino acid by including an amino acid whose isoelectric point is 7 or less in either a solution that contains an amphipathic block polymer or in an aqueous liquid, or in both.

The disclosure concerns glass fiber filled nylon resin composites including a polyolefin based color masterbatch. The compositions further comprise a compatibilizer.

The present disclosure is drawn to a composite particulate build material, including 92 wt % to 99.5 wt % polymeric particles having an average size from 10 ?m to 150 ?m and an average aspect ratio of less than 2:1. The composite particulate build material further includes from 0.5 wt % to 8 wt % reinforcing particles having an average size of 0.1 ?m to 20 ?m and an average aspect ratio of 3:1 to 100:1 applied to surfaces of the polymeric particles, wherein the reinforcing particles include mica or glass.

Provided are a polyamide resin foam shaped product containing a polyamide resin and having a crystallinity X of 10% to 50% and a crystallite size D of 10 nm or more as calculated based on a peak having a smallest peak width in an X-ray diffraction profile of the foam shaped product, and a method of producing this polyamide resin foam shaped product.

The present invention discloses a -polylysine hydrogel and the preparation method and application of the as-described -polylysine hydrogel. The polylysine hydrogel is non-toxic to a recipient, and has biodegradability and biocompatibility. The wound tissue healing material prepared by the present invention can be used in wound tissue adhesion in an efficient, stable, safe manner.

A method for forming a thermoplastic prepreg is disclosed. The method includes supplying continuous fibers to a first extrusion device, supplying a first thermoplastic feedstock to the first extrusion device, wherein the feedstock comprises a first thermoplastic polymer, pre-heating, tensioning, and spreading the continuous fibers, extruding the continuous fibers and the first feedstock within an impregnation die to form a first extrudate in which the continuous fibers are embedded with a matrix of the first thermoplastic polymer, twisting the first extrudate, supplying a second thermoplastic polymer to a second extrusion device, extruding the first extrudate and the second thermoplastic feedstock within an impregnation die to form a second extrudate in which the second feedstock forms a layer around the first extrudate, while the first extrudate is twisted and under tension, and forming a sleeve of the second extrudate having the second feedstock forming a layer around the first extrudate.

The invention relates to an elastic filament comprising a copolymer containing polyamide blocks and polyether blocks, the polyamide blocks being chosen from PA 11, PA 12, PA 1010, PA 1012, PA 1014, the copolymer thereof and the mixture thereof, the polyether blocks being blocks derived from polytetramethylene glycol having a weight-average molecular mass of between 500 and 3000 g/mol, the enthalpy of fusion of the copolymer being between 15 and 50 J/g.

This invention provides a preparation, composition, product, and application of a photo-coupled synergistically crosslinked hydrogel material. The preparation includes dissolving Component A including a photosensitive polymer derivative having o-nitrobenzyl phototriggers and Component B including a polymer derivative having amine or alkene (double group) or sulfhydryl group in a biocompatible medium to obtain solution A and solution B, respectively; mixing the solution A and solution B homogeneously to obtain a hydrogel precursor solution; initiating photo-coupled synergistic crosslinking under an irradiation of a UV light to form the hydrogel. The irradiation causes the o-nitrobenzyl phototriggers to generate an aldehyde group/keto group or a nitroso group to initiate photo-coupled synergetic crosslinking. The photo-coupled synergistically crosslinked hydrogel has applications in tissue engineering, regenerative medicine, 3D printing and as a carrier of cell, protein or drug.