Abstract: The present invention relates to the field of thermoplastic composite materials. Specifically, the invention relates to a fluorinated, flame-retardant thermoplastic composition, to the prepreg prepared from said composition, to the composite material containing said prepreg, to the methods enabling manufacture, and to the uses of said material. The invention also relates to the use of a thermoplastic prepreg for manufacturing fire-resistant composite materials.

Abstract: The present invention relates to a method for producing a conductive composite material, as well as the composite material capable of being obtained by said method. The conductive material is obtained from a composite polymer matrix, which is formed by aggregation of composite conductive particles consisting of particles of a polymer matrix, having a diamter d50 of between 1 and 4000 ?m, coated with a layer of electrically conductive material consisting of at least one metal. The ratio of the thickness of the conductive layer to the diameter d50 of the polymer matrix particles is between 0.0025:100 and 1.5:100, said thickness being less than 300 nm.

Abstract: A method for impregnating strands or strips of natural fibers, using the following successive steps: i) the impregnation of the strands or strips by immersion in a bath containing a fine aqueous polymer dispersion; followed by ii) the drying of the strands or strips using a heating system, with the progressive elimination of the water and the gradual melting of the polymer, and the coating of the strands or strips and the molten polymer incorporated into the core of the strands or strips as a binder between the fibers; iii) optionally, the forming of the treated strands or strips into their final shape; and iv) the cooling of the treated strands or strips. The aqueous polymer dispersion comprises at least one semi-crystalline or amorphous polymer and, in the case of an amorphous polymer, has a Tg varying between 50° C. and 175° C.

Abstract: The present invention relates to a method for producing a conductive composite material, as well as the composite material capable of being obtained by said method. The conductive material is obtained from a composite polymer matrix, which is formed by aggregation of composite conductive particles consisting of particles of a polymer matrix, having a diamter d50 of between 1 and 4000 ?m, coated with a layer of electrically conductive material consisting of at least one metal. The ratio of the thickness of the conductive layer to the diameter d50 of the polymer matrix particles is between 0.0025:100 and 1.5:100, said thickness being less than 300 nm.

Abstract: The use of an aqueous polymer dispersion including at least one amorphous polymer having a Tg varying between 55° C. and 175° C. or a semi-crystalline polymer having a melting point varying between 70° C. and less than 220° C., the weight concentration of the polymer in the dispersion varying between 5 and 50%, with the polymer particles having an average size of less than 10000 nm, as a binder for impregnating strands or strips of natural fibers, in particular flax fibers, with said polymer being incorporated in the core of the fiber bundle forming the strand or strip and thereby binding the fibers together.

Abstract: The present invention relates to the field of thermoplastic composite materials. Specifically, the invention relates to a fluorinated, flame-retardant thermoplastic composition, to the prepreg prepared from said composition, to the composite material containing said prepreg, to the methods enabling manufacture, and to the uses of said material. The invention also relates to the use of a thermoplastic prepreg for manufacturing fire-resistant composite materials.

Abstract: The invention relates to a composition which includes: at least one polyamide; at least one melamine derivative as a fire-retardant agent; optionally at least one polyol containing at least four alcohol functional groups; and optionally at least one reinforcement in the form of a fiber. The invention also relates to the method for producing said composition and to the use of same.

Abstract: A method for impregnating strands or strips of natural fibres, using the following successive steps: i) the impregnation of the strands or strips by immersion in a bath containing a fine aqueous polymer dispersion; followed by ii) the drying of the strands or strips using a heating system, with the progressive elimination of the water and the gradual melting of the polymer, and the coating of the strands or strips and the molten polymer incorporated into the core of the strands or strips as a binder between the fibres; iii) optionally, the forming of the treated strands or strips into their final shape; and iv) the cooling of the treated strands or strips. The aqueous polymer dispersion comprises at least one semi-crystalline or amorphous polymer and, in the case of an amorphous polymer, has a Tg varying between 50° C. and 175° C.

Abstract: The use of an aqueous polymer dispersion including at least one amorphous polymer having a Tg varying between 55° C. and 175° C. or a semi-crystalline polymer having a melting point varying between 70° C. and less than 220° C., the weight concentration of the polymer in the dispersion varying between 5 and 50%, with the polymer particles having an average size of less than 10000 nm, as a binder for impregnating strands or strips of natural fibres, in particular flax fibres, with said polymer being incorporated in the core of the fibre bundle forming the strand or strip and thereby binding the fibres together.

Abstract: A method of producing a composite material, comprising an assembly of natural fibers, impregnated with an amorphous or semi-crystalline thermoplastic polymer, said method including: i) a step of impregnating said assembly with a precursor composition in the molten state and including: a) at least one prepolymer P(X)n of said thermoplastic polymer, having a molecular chain P having, at the ends of same, n reactive functions X, with n ranging from 1 to 3, in particular n being 1 or 2, and preferably 2 b) at least one chain extender Y-A-Y including reactive functions Y with at least one of said functions X ii) a step of polymerization by mass (poly)addition, in the molten state, of said prepolymer with said chain extender with: said thermoplastic polymer being the result of said polymerization by mass polyaddition and said impregnation i) and polymerization ii) taking place at a temperature lower than 250° C.

Abstract: A method of producing a composite material, comprising an assembly of natural fibres, impregnated with an amorphous or semi-crystalline thermoplastic polymer, said method including: i) a step of impregnating said assembly with a precursor composition in the molten state and including: a) at least one prepolymer P(X)n of said thermoplastic polymer, having a molecular chain P having, at the ends of same, n reactive functions X, with n ranging from 1 to 3, in particular n being 1 or 2, and preferably 2 b) at least one chain extender Y-A-Y including reactive functions Y with at least one of said functions X ii) a step of polymerisation by mass (poly)addition, in the molten state, of said prepolymer with said chain extender with: said thermoplastic polymer being the result of said polymerisation by mass polyaddition and said impregnation i) and polymerisation ii) taking place at a temperature lower than 250° C.

Abstract: The invention provides a self-adhesive composition in powder form for the coating of metallic substrates, composed of homopolyamide (A) selected from PA11 and PA12, copolyamide (B), calcium carbonate and, optionally, at least one component selected from a pigment or dye, an anti-crater agent or spreading agent, a reductant, an antioxidant, a reinforcing filler, a UV stabilizer, a fluidizing agent and a corrosion inhibitor, said composition being devoid of silane-type adhesion promoter or of an adhesion promoter containing an epoxy, alcohol and/or carboxylic acid function, or derivatives thereof, and having a dry-state modulus and/or a wet-state modulus of greater than or equal to 2200 MPa [Standard NF EN ISO 527].

Abstract: The invention provides a self-adhesive composition in powder form for the coating of metallic substrates, composed of homopolyamide (A) selected from PA11 and PA12, copolyamide (B), calcium carbonate and, optionally, at least one component selected from a pigment or dye, an anti-crater agent or spreading agent, a reductant, an antioxidant, a reinforcing filler, a UV stabilizer, a fluidizing agent and a corrosion inhibitor, said composition being devoid of silane-type adhesion promoter or of an adhesion promoter containing an epoxy, alcohol and/or carboxylic acid function, or derivatives thereof, and having a dry-state modulus and/or a wet-state modulus of greater than or equal to 2200 MPa [Standard NF EN ISO 527].

Abstract: The present invention concerns a process for preparing a polymer nanocomposite composition, the process comprising: a) mixing a melted polyamide of inherent viscosity under 1 and a nanofiller to disperse the nanofiller in said polyamide; and b) subjecting the previous mixture to polymerization conditions to polymerize the polyamide and to form the polymer nanocomposite composition. Advantageously the inherent viscosity of the polyamide is under 0.9 and preferably between 0.4 and 0.8. Step a) is carried out in an extruder or a mixer. Advantageously a mono or twin-screw extruder is used. Step b) could be made either in melted state or in solid state. It is easier to make it in the same apparatus as step a). Should step a) is carried out in an extruder, step b) is made in the same extruder. Polymerization of step b) can be carried with a catalyst and/or by having the extruder zones in which step b) takes place to operate under vacuum.

Abstract: The invention concerns to the use of a powder comprising 99.95 to 95% of at least one polyamide and 0.05 to 5% of at least one silane for coating metals. This powder may be prepared by simple dry blending of the constituents. The silane can also be added to the molten polyamide in a mixing device and the resulting product reduced to powder. The addition of silane makes it possible to significantly improve electrostatic application by preventing a substantial portion of the powder from falling off during the electrostatic discharge which follows application, while providing lasting adhesion between the coating and metal. Advantageously, the silane is chosen from aminopropyltriethoxysilane and aminopropyltrimethoxysilane. The invention also concerns a method of coating an object with a film resulting from melting a thin layer of the powder.

Abstract: The present invention relates to the use of a powder for coating articles, this powder comprising, by volume, 99 to 65% of at least one thermoplastic polymer and 1 to 35% of beads of a material that retains its initial shape at the processing temperatures for obtaining the coating. This powder may be prepared by simply dry-blending the constituents. The invention also relates to this powder. The invention relates in particular to rough coatings obtained from powders, for a dishwasher basket, which contain solid or hollow glass or ceramic beads added by dry-blending them with the polyamide powder. Because of their roughness, these coatings improve the drying in dishwashers. The addition of glass beads furthermore improves the quality of the fluidization.

Abstract: The invention concerns to the use of a powder comprising 99.95 to 95% of at least one polyamide and 0.05 to 5% of at least one silane for coating metals. This powder may be prepared by simple dry blending of the constituents. The silane can also be added to the molten polyamide in a mixing device and the resulting product reduced to powder. The addition of silane makes it possible to significantly improve electrostatic application by preventing a substantial portion of the powder from falling off during the electrostatic discharge which follows application, while providing lasting adhesion between the coating and metal. Advantageously, the silane is chosen from aminopropyltriethoxysilane and aminopropyltrimethoxysilane. The invention also concerns a method of coating an object with a film resulting from melting a thin layer of the powder.