Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
  • C08L77/10—Polyamides derived from aromatically bound amino and carboxyl groups of amino-carboxylic acids or of polyamines and polycarboxylic acids
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
  • C08L77/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/02—Elements
  • C08K3/04—Carbon
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K7/00—Use of ingredients characterised by shape
  • C08K7/02—Fibres or whiskers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K7/00—Use of ingredients characterised by shape
  • C08K7/22—Expanded, porous or hollow particles
  • C08K7/24—Expanded, porous or hollow particles inorganic
  • C08K7/28—Glass
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
  • C08L51/06—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
  • C08L77/06—Polyamides derived from polyamines and polycarboxylic acids
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
  • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
  • B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
  • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
  • B29K2105/16—Fillers
  • B29K2105/165—Hollow fillers, e.g. microballoons or expanded particles
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
  • C08G69/40—Polyamides containing oxygen in the form of ether groups
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2203/00—Applications
  • C08L2203/20—Applications use in electrical or conductive gadgets

Definitions

• TITLE Molding compositions based on polyamide, carbon fibers and hollow glass balls and their use
• the present invention relates to molding compositions based on polyamide, carbon fibers, impact modifier and hollow glass beads and their use for the preparation of articles, in particular for the field of electronics, sport, sports. automotive or industrial products obtained by injection and exhibiting low density, high rigidity, good impact properties and good processability.
• the rigidity of a part is directly linked to the modulus of the material of which this part is made.
• a high modulus material makes it possible to reduce the thicknesses of the parts and therefore to save a lot on the weight of the latter while keeping the rigidity necessary for a good elastic return which is essential for athletes.
• the articles must be able to be injected easily and allow the production of parts having a good appearance and ability to be colored in various colors.
• the impact modifier if present, is chosen from a long list such as polyethylene, polypropylene, polyolefin copolymers, acrylate copolymers, acrylic acid copolymers, vinyl acetate copolymers, copolymers of styrene, styrene block copolymers, ionic ethylene copolymers in which the acid groups are partially neutralized with metal ions, core-shell impact modifiers and mixtures thereof.
• the modulus of the impact modifier is not mentioned and polyether block amides (PEBAs) are missing from this long list.
• PEBAs polyether block amides
• the additives are present at most up to 5% by weight and are preferably present between 0.1 and 3%.
• compositions comprising one or more thermoplastic resins, one or more reinforcing fillers based on fibers and hollow microspheres. Only PA66 is exemplified and impact modifiers are not mentioned in this application.
• Application JP 2007/119669 describes a polyamide composition
• a polyamide composition comprising a polyamide resin, hollow glass beads and optionally an inorganic filler different from glass beads.
• the composition can comprise an impact modifier without specifying the modulus thereof, and the polyolefins and the PEBAs are not mentioned in this application.
• Application JP 2013/010847 describes a composition comprising 100 parts by weight of a polyamide resin, from 10 to 300 parts by weight of a carbon fiber and from 0.1 to 30 parts by weight of a spherical filler.
• the composition can comprise an impact modifier without specifying the modulus thereof, and the polyolefins and the PEBAs are not mentioned in this application.
• Application JP 06-271763 describes a composition comprising a mixture of 100 parts by weight of a polyamide-based resin and 5 to 200 parts by weight of hollow sphere having an average particle diameter less than or equal to 100 ⁇ m and optionally an inorganic filler which can be carbon fiber. Impact modifiers are not mentioned in this application.
• compositions exhibiting a low density, high rigidity, good impact properties while retaining good processability.
• the Applicant has thus surprisingly discovered that the selection of a particular range of impact modifier exhibiting a particular modulus in a composition also comprising at least one semi-crystalline polyamide, hollow glass beads and carbon fibers made it possible to prepare compositions exhibiting low density, high rigidity, good impact properties while retaining good processability.
• the present invention relates to a molding composition, comprising by weight:
• composition defined above is excluding PA6 and PA66.
• the composition defined above is excluding nano alumina.
• composition defined above is excluding PA6 and PA66 and nano alumina.
• the flexural modulus is determined in the dry state.
• a semi-crystalline polyamide within the meaning of the invention, denotes a polyamide which has a melting point (Tm) measured according to standard ISO 11357-3: 2013 by DSC, and an enthalpy of crystallization measured during the step of cooling at a speed of 20K / min by DSC according to standard ISO 11357-3 of 2013 greater than 30 J / g, preferably greater than 40 J / g.
• Tm melting point measured according to standard ISO 11357-3: 2013 by DSC
• an enthalpy of crystallization measured during the step of cooling at a speed of 20K / min by DSC according to standard ISO 11357-3 of 2013 greater than 30 J / g, preferably greater than 40 J / g.
• polyamide used in the present description covers both homopolyamides and copolyamides.
• the impact modifier is a polymer having a flexural modulus of less than 200 MPa, in particular less than 100 MPa, measured according to the ISO 178: 2010 standard at 23 ° C. in the dry state.
• the impact modifier is chosen from a poly ether block amide (PEBA), a functionalized or non-functionalized polyolefin and mixtures thereof.
• PEBA poly ether block amide
• a functionalized or non-functionalized polyolefin and mixtures thereof.
• the impact modifier is present from 5.5 to 20.0% by weight.
• it is present from 5.5 to 10.0% by weight, more preferably from 5.5 to 8.0% by weight.
• Poly ether block amide are copolymers with amide units (Bal) and polyether units (Ba2), said amide unit (Bal) corresponding to an aliphatic repeating unit chosen from a unit obtained from at least one amino acid or a unit obtained from at least one lactam, or an XY unit obtained from polycondensation:
• diamine being chosen from a linear or branched aliphatic diamine or an aromatic diamine or a mixture thereof, and
• said dicacid being chosen from: an aliphatic diacid or an aromatic diacid, said diamine and said diacid comprising from 4 to 36 carbon atoms, advantageously from 6 to 18 carbon atoms; said polyether units (Ba2) being in particular derived from at least one polyalkylene ether polyol, in particular a polyalkylene ether diol,
• PEBAs result in particular from the copolycondensation of polyamide blocks with reactive ends with polyether blocks with reactive ends, such as, among others:
• Polyamide sequences having dicarboxylic chain ends with polyoxyalkylene sequences having diamine chain ends obtained by cyanoethylation and hydrogenation of aliphatic polyoxyalkylene alpha-omega dihydroxylated sequences called polyalkylene ether diols (polyetherdiols).
• the polyamide blocks containing dicarboxylic chain ends originate, for example, from the condensation of polyamide precursors in the presence of a dicarboxylic acid chain limiter.
• the polyamide blocks having diamine chain ends originate, for example, from the condensation of polyamide precursors in the presence of a chain-limiting diamine.
• Polymers containing polyamide blocks and polyether blocks can also comprise units distributed randomly. These polymers can be prepared by the simultaneous reaction of the polyether and the precursors of the polyamide blocks.
• polyetherdiol polyamide precursors and a chain limiting dibasic acid.
• a polymer is obtained having essentially polyether blocks, polyamide blocks of very variable length, but also the various reactants having reacted randomly which are distributed randomly (statistically) along the polymer chain.
• polyetherdiamine polyamide precursors and a chain-limiting diacid.
• a polymer is obtained having essentially polyether blocks, polyamide blocks of very variable length, but also the various reactants having reacted randomly which are distributed randomly (statistically) along the polymer chain.
• the amide unit (Bal) corresponds to an aliphatic repeating unit as defined above.
• (Bal) represents an amide unit obtained from 11-aminoundecanoic acid or undecanolactam.
• composition of the invention is therefore devoid of polyetherdiamine triblock.
• the number-average molecular mass of the polyether blocks is advantageously from 200 to 4000 g / mole, preferably from 250 to 2500 g / mole, in particular from 300 and 1100 g / mole.
• PEBA can be prepared by the process according to which:
• the polyamide blocks (Bal) are prepared by polycondensation of the lactam (s), or of the amino acid (s), or of the diamine (s) and of the diacid (s) carboxylic (s); and where appropriate, of the comonomer (s) chosen from lactams and alpha-omega-aminocarboxylic acids; in the presence of a chain limiter chosen from dicarboxylic acids; then
• polyamide blocks (Bal) obtained are reacted with polyether blocks (Ba2), in the presence of a catalyst.
• the reaction for the formation of the block (Bal) is usually carried out between 180 and 300 ° C, preferably from 200 to 290 ° C, the pressure in the reactor is established between 5 and 30 bar, and it is maintained at about 2 to 3 time. The pressure is slowly reduced by bringing the reactor to atmospheric pressure, then the excess water is distilled, for example for an hour or two.
• the polyamide containing carboxylic acid ends having been prepared, the polyether and a catalyst are then added.
• the polyether can be added in one or more steps, as can the catalyst.
• the polyether is added first, the reaction of the OH ends of the polyether and of the COOH ends of the polyamide begins with formation of ester bonds and elimination of water. The water is removed as much as possible from the reaction medium by distillation, then the catalyst is introduced to complete the bonding of the polyamide blocks and of the polyether blocks.
• This second step is carried out with stirring, preferably under a vacuum of at least 15 mm Hg (2000 Pa) at a temperature such that the reactants and the copolymers obtained are in the molten state.
• this temperature can be between 100 and 400 ° C and most often 200 and 300 ° C.
• the reaction is followed by measuring the torque exerted by the molten polymer on the agitator or by measuring the electrical power consumed by the agitator. The end of the reaction is determined by the value of the target torque or power.
• antioxidant it will also be added during the synthesis, at the moment judged the most opportune, one or more molecules used as antioxidant, for example Irganox ® 1010 or Irganox ® 245.
• said dicarboxylic acid which is introduced in excess relative to the stoichiometry of the diamine (s), is used as chain limiter.
• a derivative of a metal chosen from the group formed by titanium, zirconium and hafnium or a strong acid such as phosphoric acid, hypophosphorous acid or boric acid is used as catalyst.
• the polycondensation can be carried out at a temperature of 240 to 280 ° C.
• copolymers with known ethers and amides units consist of linear and semi-crystalline aliphatic polyamide blocks (for example the "Pebax” from Arkema).
• the polyolefin of the impact modifier can be functionalized or non-functionalized or be a mixture of at least one functionalized and / or at least one non-functionalized.
• the polyolefin has been designated by (P) and functionalized polyolefins (PI) and unfunctionalized polyolefins (P2) have been described below.
• An unfunctionalized polyolefin (P2) is conventionally a homopolymer or copolymer of alpha olefins or diolefins, such as, for example, ethylene, propylene, butene-1, octene-1, butadiene.
• alpha olefins or diolefins such as, for example, ethylene, propylene, butene-1, octene-1, butadiene.
• LDPE low density polyethylene
• HDPE linear low density polyethylene, or linear low density polyethylene
• VLDPE very low density polyethylene, or very low density polyethylene
• metallocene polyethylene metallocene polyethylene.
• ethylene / alpha-olefin copolymers such as ethylene / propylene, EPR (abbreviation of ethylene-propylene-rubber) and ethylene / propylene / diene (EPDM).
• EPR abbreviation of ethylene-propylene-rubber
• EPDM ethylene / propylene / diene
• SEBS ethylene-butene / styrene
• SBS styrene / butadiene / styrene
• SIS styrene / isoprene / styrene
• SEPS styrene / ethylene-propylene / styrene
• the functionalized polyolefin (PI) can be a polymer of alpha olefins having reactive units (functionalities); such reactive units are acid, anhydride or epoxy functions.
• reactive units are acid, anhydride or epoxy functions.
• P2 polyolefins
• unsaturated epoxides such as glycidyl (meth) acrylate
• carboxylic acids or the corresponding salts or esters such as (meth) acrylic acid (the latter being able to be totally or partially neutralized by metals such as Zn, etc.) or alternatively by carboxylic acid anhydrides such as maleic anhydride.
• a functionalized polyolefin is for example a PE / EPR mixture, the weight ratio of which can vary widely, for example between 40/60 and 90/10, said mixture being co-grafted with an anhydride, in particular maleic anhydride, according to a degree of grafting, for example from 0.01 to 5% by weight.
• the functionalized polyolefin (PI) can be chosen from the following (co) polymers, grafted with maleic anhydride or glycidyl methacrylate, in which the degree of grafting is for example from 0.01 to 5% by weight:
• ethylene / alpha-olefin copolymers such as ethylene / propylene, EPR (abbreviation of ethylene-propylene-rubber) and ethylene / propylene / diene (EPDM).
• EPR abbreviation of ethylene-propylene-rubber
• EPDM ethylene / propylene / diene
• SEBS ethylene-butene / styrene
• SBS styrene / butadiene / styrene
• SIS styrene / isoprene / styrene
• SEPS styrene / ethylene-propylene / styrene
• alkyl (meth) acrylate copolymers containing up to 40% by weight of alkyl (meth) acrylate;
• PI functionalized polyolefin
• the functionalized polyolefin (PI) can also be a co- or ter polymer of at least the following units: (1) ethylene, (2) alkyl (meth) acrylate or vinyl ester of saturated carboxylic acid and (3) anhydride such as maleic anhydride or (meth) acrylic acid or epoxy such as glycidyl (meth) acrylate.
• (meth) acrylic acid can be salified with Zn or Li.
• alkyl (meth) acrylate in (PI) or (P2) denotes methacrylates and C 1 to C 8 alkyl acrylates, and can be chosen from methyl acrylate, ethyl acrylate , n-butyl acrylate, isobutyl acrylate, ethyl-2-hexyl acrylate, cyclohexyl acrylate, methyl methacrylate and ethyl methacrylate.
• the aforementioned polyolefins (PI) can also be crosslinked by any suitable process or agent (diepoxy, diacid, peroxide, etc.); the term functionalized polyolefin also includes mixtures of the abovementioned polyolefins with a difunctional reagent such as diacid, dianhydride, diepoxy, and the like. capable of reacting with these or mixtures of at least two functionalized polyolefins capable of reacting with each other.
• a difunctional reagent such as diacid, dianhydride, diepoxy, and the like.
• copolymers mentioned above, (PI) and (P2) can be copolymerized in a random or block fashion and have a linear or branched structure.
• MFI melt flow index
• the unfunctionalized polyolefins (P2) are chosen from homopolymers or copolymers of polypropylene and any homopolymer of ethylene or copolymer of ethylene and of a comonomer of higher alpha olefinic type such as butene, hexene, octene or 4-methyl 1-Pentene. Mention may be made, for example, of PPs, high density PE, medium density PE, linear low density PE, low density PE, very low density PE. These polyethylenes are known to man of the Art as being produced according to a “radical” process, according to a “Ziegler” type catalysis or, more recently, according to a so-called “metallocene” catalysis.
• the impact modifier is chosen from Fusabond ® F493, Tafmer MFI5020, a Lotader ® , for example Lotader ® 4700, Exxelor ® VA1803, VA1801 and VA 1840, Orevac ® IM800 or a mixture of these , in this case they are in a ratio ranging from 0.1 / 99.9 to 99.9 / 0.1, the kratons ® FG 1901, FG 1924, MD 1653, the Tuftec ® M1913, M1911 and M 1943, and a Pebax ® , in particular Pebax ® 40R53 SP01.
• the impact modifier is chosen from a poly ether block amide (PEBA) exhibiting a flexural modulus of less than 200 MPa, in particular less than 100 MPa as measured according to the ISO 178: 2010 standard at 23 ° C. as defined above, and a mixture of poly ether block amide (PEBA) having a flexural modulus of less than 200 MPa, in particular less than 100 MPa as measured according to standard ISO 178: 2010 at 23 ° C with a functionalized or non-functionalized polyolefin as defined above.
• PEBA poly ether block amide
• PEBA poly ether block amide
• the PEBA has a density greater than or equal to 1, in particular greater than 1, as determined according to ISO 1183-3: 1999.
• the impact modifier is chosen from a functionalized polyolefin, an unfunctionalized polyolefin and their mixtures, said impact modifier being present from 7.0 to 20.0%, in particular from 10.0 to 20.0. % relative to the total weight of the composition.
• the functionalized polyolefin carries a function chosen from maleic anhydride, carboxylic acid, carboxylic anhydride and epoxide functions, and is in particular chosen from ethylene / octene copolymers, ethylene / butene copolymers, ethylene / propylene elastomers (EPR), ethylene-propylene-diene copolymers with an elastomeric character (EPDM) and ethylene / (meth) acrylate copolymers.
• EPR ethylene-propylene-diene copolymers with an elastomeric character
• EPDM ethylene / (meth) acrylate copolymers.
• the impact modifier is to the exclusion of ethylene-propylene-diene copolymers of elastomeric character (EPDM) grafted with maleic anhydride.
• EPDM elastomeric character
• the average number of carbon atoms relative to the nitrogen atom is greater than or equal to 6.
• the semi-crystalline aliphatic polyamide is excluding PA6 and PA66.
• it is greater than or equal to 8.
• the number of carbon atoms per nitrogen atom is the average of the X unit and the Y unit.
• the carbon number per nitrogen is calculated according to the same principle. The calculation is carried out on a molar basis for the various amide units.
• the semi-crystalline aliphatic polyamide is obtained from the polycondensation of at least one aminocarboxylic acid comprising from 6 to 18 carbon atoms, preferably from 8 to 12 carbon atoms, more preferably from 10 to 12 carbon atoms.
• the semi-crystalline aliphatic polyamide is obtained from the polycondensation of at least one lactam comprising from 6 to 18 carbon atoms, preferably from 8 to 12 carbon atoms, more preferably from 10 to 12 carbon atoms.
• it is obtained from the polycondensation of a single lactam.
• the aliphatic diamine used to obtain this X.Y repeating unit is an aliphatic diamine which has a linear main chain comprising at least 4 carbon atoms.
• This linear main chain may, where appropriate, contain one or more methyl and / or ethyl substituents; in the latter configuration, the term “branched aliphatic diamine” is used. In the case where the main chain contains no substituent, the aliphatic diamine is called “linear aliphatic diamine”.
• the dicarboxylic acid can be chosen from aliphatic, linear or branched dicarboxylic acids.
• the semi-crystalline aliphatic polyamide is obtained from a mixture of these three variants.
• the composition when it comprises an additive between 0.1 and 1.0% then the maximum limit of the proportion of semi-crystalline polyamide is lowered by the proportion of the additive present to arrive to a total of 100% constituents.
• the present invention relates to a composition as defined above, in which the semi-crystalline polyamide is (are) partially or completely bioresourced (s).
• bioresourced is understood within the meaning of standard ASTM D6852-02 and, more preferably, within the meaning of standard ASTM D6866.
• the ASTM D6852 standard indicates the proportion of products of natural origin in the composition, while the ASTM D6866 standard specifies the method and conditions for measuring renewable organic carbon, that is to say derived from biomass.
• the present invention relates to the use of a composition as defined above, for the manufacture of an article, in particular for electronics, for sports, automobiles or industry.
• the article is made by injection molding.
• compositions of Tables I and II were prepared by melt mixing the polymer granules with the carbon fibers, the hollow glass beads and the additives. This mixture was carried out by compounding on a co-rotating twin-screw extruder with a diameter of 26 mm with a temperature profile (T °) flat at 240 ° C. The screw speed is 200 rpm and the flow rate is 16 kg / h.
• the introduction of carbon fibers and hollow glass beads is carried out by lateral force-feeding.
• the polyamide (s) and the additives are added during the compounding process in the main hopper.
• Engage TM 8200, unfunctionalized ethylene octene copolymer, d 0.87 g / cm3, supplied by the company Dow Inc
• Toho Tenax HT C493 carbon fiber supplied by the company Teijin PAU: synthesized by the applicant PEBA PA11 / PTMG: synthesized by the applicant
• the tensile modulus, elongation and breaking stress were measured at 23 ° C according to ISO 527-1: 2012 on a dry sample.
• the machine used is of the INSTRON 5966 type.
• the speed of the crosspiece is 1 mm / min for the measurement of the modulus and 5 mm / min for the tensile stress and the elongation at break.
• the test conditions are 23 ° C +/- 2 ° C, on dry samples.
• the impact resistance was determined according to ISO 179-1: 2010 (Charpy impact) on test specimens of size 80mm x 10mm x 4mm, notched and not notched, at a temperature of 23 ° C +/- 2 ° C under humidity relative of 50% +/- 10% or at -30 ° C +/- 2 ° C under a relative humidity of 50% +/- 10% on dry samples.
• the density of the injected compositions was measured according to the ISO 1183-3: 1999 standard.
• the elongation at break is greater for the compositions of the invention compared to the comparative compositions.

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