Use of a copolyamide composition as a matrix for a filler having glass fibers with a circular cross section to limit warpage

Abstract

To provide the use of a semi-crystalline copolyamide for limiting warpage while maintaining the cycle time of a resulting composition, especially suitable for use by injection molding.SOLUTION: There is provided at least one semi-crystalline copolyamide A / X1Y (wherein A is a repeating unit obtained from the polycondensation of at least one C6 to C12 lactam or of at least one repeating unit XY obtained from the polycondensation of at least one C4 to C18 aliphatic diamine X, and at least one C6 to C18 aliphatic, particularly C6 to C12 dicarboxylic acid Y; and X1Y is a repeating unit obtained from the polycondensation of an X1 chosen from an arylamine, an alicyclic diamine and a branched aliphatic diamine, and at least one aliphatic dicarboxylic acid (Y) identical to that of unit XY), the A / X1Y ratio by weight being comprised from 60 / 40 to 95 / 5. There is also provided the use of the composition comprising fiberglass with a circular cross-section.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to the use of semicrystalline copolyamides, in particular branched semi-arylaliphatic, semi-cycloaliphatic or semi-aliphatic copolyamides, as a matrix for materials filled with glass fibers having a circular cross section, to limit warpage while maintaining a cycle time of the resulting composition suitable for use. The present invention also relates to the resulting composition and its use for forming a monolayer structure or at least one layer of a multilayer structure, in particular in the electrical and / or electronic (E / E) area. [Background technology]

[0002] Many applications in the E / E area require very hard materials (telephone shells, computer parts, etc.) Hardness becomes even more important as the market trend is towards reducing the weight of electronic devices and therefore the thickness of the components.

[0003] However, the creation of thin parts leads to other problems, especially regarding the injection capability, the material being flexible enough to completely fill the mould, and especially the stability of the part (no warping: a major problem with these hard materials obtained by the addition of glass fibres). The deformation (e.g. by injection) must also occur within the deformation time, especially within cycle times suitable for industrial processes.

[0004] Warpage is caused by internal constraints whose consequence (or relaxation) is a deformation of the part. In the case of highly filled materials, the orientation of the fibers in the sense of flow has the consequence of limiting the shrinkage in this direction. In contrast, in the direction perpendicular to the fiber axis, the shrinkage is controlled by the polymer and is therefore greater. This shrinkage difference is the main cause of warpage. The case of polymers reinforced with high fiber glass content is clearly an example where the warpage aspect is important.

[0005] In these applications, rigid (modulus >12 GPa) polyamides (PA) are widely used, but as soon as the fiber content exceeds 25%, the use of fibers with non-circular or flattened (FF) cross section is the solution of choice to meet all specifications and to limit warpage, especially for fine injected parts.

[0006] Thus, paragraph

[0003] of EP Application No. 2 789 591 indicates that glass fibres with a non-circular cross section do not improve the mechanical properties, dimensional stability and warpage of resins reinforced with said glass fibres with a non-circular cross section. As regards the improvement in mechanical properties, according to this application, this is due to the glass fibres with a non-circular cross section having a larger contact surface area than fibres with a circular cross section. As regards the improvement in dimensional stability and warpage, again according to EP Application No. 2 789 591, this is due to the glass fibres with a non-circular cross section being less oriented in a flow sense than the glass fibres with a circular cross section and therefore tending to be more two-dimensionally oriented than the glass fibres with a circular cross section of the injected part.

[0007] Similarly, US Patent Publication No. 2011 / 0105655 describes a composition having a low distortion rate during molding and formed of 25 to 72 wt. % polyamide, 20 to 65 wt. % glass fibers having a flat cross section with an L / D ratio of 2 to 8, and 8 to 25 wt. % flame retardant, where L represents the major dimension of the cross section of the fiber and D represents the minor dimension of the cross section of said fiber. The polyamide used is a mixture of 55 to 90 wt. % aliphatic polyamide and 10 to 45 wt. % of another polyamide, which may be MXD6, based on the total number of polyamides.

[0008] Also, US Patent Publication No. 2010 / 279111 describes a composition formed of 30 to 80% by weight of polyamide and 20 to 70% of long glass fibers with flat cross section and L / D ratio of 2 to 8, which also have low distortion during molding. The polyamide used is either a mixture of 55 to 85% by weight of an aliphatic polyamide and 15 to 45% by weight of a polyamide, which may be MXD6, relative to the total polyamide, or a mixture of 55 to 85% by weight of an aliphatic polyamide and 15 to 45% by weight of a copolyamide comprising one or more polyamides, for example MXDI or MXD6 and at least one other polyamide selected from PA 66, 610, 6 and 12.

[0009] Patent publication No. 5523520 describes polyamide granules having electrical properties and resistance to deformation.

[0010] The granules are formed from 5-40 parts by weight of a flame retardant, 5-200 parts by weight of glass fibers having a flat cross section with an L / D ratio of at least 2.3, and 0-40 parts by weight of a polyamide, which may be a mixture of an aliphatic polyamide and a semi-aromatic polyamide, such as MXD10.

[0011] However, the use of glass fibers with flat cross sections entails significant costs compared to glass fibers with circular cross sections. Moreover, sources of glass fibers with flat cross sections are much less common than sources of glass fibers with circular cross sections. These two aspects are essential in the scope of industrial production of glass fiber reinforced resins.

[0012] Patent document EP1972659 describes compositions and articles for portable electronic devices. The examples shown show that when glass fibers with flat cross section are used, there is no warping in a composition containing a mixture of polyamide PA66 and MXD6 (mostly MXD6) (Example 1). In contrast, when glass fibers with circular cross section are used (Comparative 2), the composition shows substantial warping. This document does not mention cycle times.

[0013] Furthermore, patent document EP 2456822 teaches that compositions containing MXD10 exhibit good elastic modulus, but require high mold temperatures during molding by injection molding to ensure maximum crystallization of the product and thus provide optimal mechanical properties and dimensional stability.

[0014] It is therefore necessary to have a composition that uses glass fibres with a circular cross section and a copolyamide matrix, thereby ensuring a permanent supply of glass fibres with a circular cross section while limiting the cost of said composition and its drawbacks (i.e. warpage caused by the glass fibres, especially when compositions containing more than 25% glass fibres are used, and by maintaining a sufficiently rapid crystallization kinetics for the matrix to have sufficiently short deformation times, especially short cycle times during injection, and easy demolding).

[0015] These various problems have been solved by the use of certain semi-crystalline copolyamides, in particular branched semi-arylaliphatic, semi-cycloaliphatic or semi-aliphatic copolyamides, as the matrix for materials filled with glass fibres having a circular cross section. Summary of the Invention

[0016] Thus, the present invention provides a method for limiting warpage while maintaining a cycle time of the resulting composition suitable for use, particularly by injection. at least one semicrystalline copolyamide A / X 1 Y, [In formula: - A has at least one C 6 -C 12 , preferably C 12 Polycondensation of lactam or at least one C 6 -C 12 , preferably C 11 A repeating unit obtained by polycondensation of an amino acid, or at least one C 4 -C 18 , especially C 4 -C 12An aliphatic diamine (X) and at least one C 6 -C 18 , especially C 6 -C 12 at least one repeat unit XY resulting from polycondensation with an aliphatic dicarboxylic acid (Y), -X 1 Y is a diamine (X) selected from arylamines, alicyclic diamines and branched aliphatic diamines; 1 ) with at least one aliphatic dicarboxylic acid (Y) identical to that of unit XY, A / X 1 Y weight ratio is included between 60 / 40 and 95 / 5] Glass fibers having a circular cross section, and Optionally, at least one impact modifier and / or at least one additive. The present invention relates to the use of a composition comprising:

[0017] Thus, when A results from the polycondensation of at least one lactam or at least one amino acid, the aliphatic dicarboxylic acid (Y) is selected from the group consisting of C 6 -C 18 , especially C 6 -C 12 When A is in unit XY, 1 Y in Y is as defined above and is further identical to that of the unit XY.

[0018] In other words, the present invention provides a method for limiting the warpage of an article obtained from a composition while maintaining a cycle time of said composition obtained suitable for use for the preparation of the article, in particular by injection, at least one semicrystalline copolyamide A / X 1 Y [In formula: - A has at least one C 6 -C 12 , preferably C 12 Polycondensation of lactam or at least one C 6 -C 12 , preferably C 11Repeating units obtained from the polycondensation of amino acids or at least one C 4 -C 18 , especially C 4 -C 12 An aliphatic diamine (X) and at least one C 6 -C 18 , especially C 6 -C 12 at least one repeat unit XY resulting from polycondensation with an aliphatic dicarboxylic acid (Y), -X 1 Y is a diamine (X) selected from arylamines, alicyclic diamines and branched aliphatic diamines; 1 ) with at least one aliphatic dicarboxylic acid (Y), as defined above and identical to that of unit XY, when A is unit XY, A / X 1 Y weight ratio is included between 60 / 40 and 95 / 5] Glass fibers having a circular cross section, and Optionally, at least one impact modifier and / or at least one additive. The present invention relates to the use of a composition comprising:

[0019] Advantageously, cyclohexanedicarboxylic acid is excluded from the definition of aliphatic dicarboxylic acids (Y).

[0020] Throughout the specification, expressions including "from" are meant to include the range values.

[0021] Semicrystalline copolyamide A / X 1 Y and a repeating unit X containing a branched arylaliphatic, cycloaliphatic or aliphatic diamine in a specific weight percentage in a composition comprising glass fibers having a circular cross section 1 The inventors have unexpectedly discovered that the presence of Y not only limits warpage of the composition during use, particularly by injection, of articles obtained from said composition, compared to linear aliphatic polyamide A alone, but also maintains adequate cycle times during use, while avoiding mold ejection problems associated with incomplete crystallization of the composition.

[0022] Semicrystalline copolyamide, in the sense of the present invention, denotes a copolyamide having a melting temperature (Tm) according to DSC in accordance with ISO standard 11357-3 of 2013 and a crystallization enthalpy during the cooling step at a rate of 20 K / min by DSC measured in accordance with ISO standard 11357-3 of 2013 of more than 30 J / g, preferably more than 40 J / g.

[0023] The nomenclature used to define polyamides is described in ISO standard 1874-1:2011 "Plastics-Polyamide (PA) Materials for Moulding and Extrusion--Part 1: Designation", especially page 3 (Tables 1 and 2), and is well known to those skilled in the art.

[0024] When the repeating unit A of the copolyamide results from the polycondensation of a lactam, the lactam may be chosen from pyrrolidinone, 2-piperidinone, caprolactam, enantholactam, caprylolactam, pelargolactam, decanolactam, undecanolactam and lauryllactam, and in particular lauryllactam.

[0025] When the repeat unit A of the copolyamide results from the polycondensation of amino acids, the amino acids may be chosen from 9-aminononanoic acid, 10-aminodecanoic acid, 10-aminoundecanoic acid, 12-aminododecanoic acid and 11-aminoundecanoic acid, and derivatives thereof, in particular N-heptyl-11-aminoundecanoic acid, in particular 11-aminoundecanoic acid.

[0026] When the repeating unit A of the copolyamide is obtained by polycondensation of the repeating unit XY, the C used in the polyamide XY 4 -C 18The diamine (X) is a linear aliphatic diamine and may be chosen in particular from 1,4-butanediamine, 1,5-pentamethylenediamine, 1,6-hexamethylenediamine, 1,7-heptamethyldiamine, 1,8-octamethyldiamine, 1,9-nonamethyldiamine, 1,10-decamethyldiamine, 1,11-undecamethyldiamine, 1,12-dodecamethyldiamine, 1,13-tridecamethyldiamine, 1,14-tetradecamethyldiamine, 1,16-hexadecamethyldiamine and 1,18-octadecamethyldiamine.

[0027] Advantageously, the diamine (X) used is 4 -C 12 The diamine is in particular selected from 1,4-butanediamine, 1,5-pentamethyldiamine, 1,6-hexamethylenediamine, 1,7-heptamethyldiamine, 1,8-octamethyldiamine, 1,9-nonamethyldiamine, 1,10-decamethyldiamine, 1,11-undecamethyldiamine, 1,12-dodecamethyldiamine.

[0028] Advantageously, the diamine (X) used is 6 -C 10 The diamine is in particular selected from 1,6-hexamethylenediamine, 1,7-heptamethyldiamine, 1,8-octamethyldiamine, 1,9-nonamethyldiamine, 1,10-decamethyldiamine.

[0029] When the repeat unit A of the copolyamide is obtained from the polycondensation of the repeat unit XY, 6 -C 18 The aliphatic dicarboxylic acid (Y) may be selected from adipic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, brassylic acid, tetradecanedioic acid, pentadecanedioic acid, hexadecanedioic acid, octadecanedioic acid.

[0030] Advantageously, the aliphatic dicarboxylic acid (Y) is 6 -C 12It is an acid and may be selected from adipic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid or dodecanedioic acid.

[0031] The aliphatic diamine (X) may be mixed with one or more other aliphatic diamines X'.

[0032] In the same manner, the aliphatic dicarboxylic acid (Y) may be mixed with one or more other aliphatic dicarboxylic acids Y'.

[0033] In the latter two cases, the repeating units XY containing X' and / or Y' in each case represent a proportion by weight of 60% or more.

[0034] In contrast, mixtures of aliphatic repeating units XY with one or more repeating units resulting from the polycondensation of lactams or amino acids are excluded from the scope of the present invention.

[0035] Repeating unit X 1 With respect to Y, diamine (X 1 ) is selected from branched arylamines, alicyclic diamines, and aliphatic diamines.

[0036] Diamine (X 1 When is an arylamine, the diamine may be selected from meta-xylylenediamine (MXD, CAS number 1477-55-0) or para-xylylenediamine (PXD, CAS number 539-48-0).

[0037] Alicyclic diamine (X 1When is a cycloaliphatic diamine, the cycloaliphatic diamine may be bis(3,5-dialkyl-4-aminocyclohexyl)-methane, bis(3,5-dialkyl-4-aminocyclohexyl)ethane, bis(3,5-dialkyl-4-aminocyclohexyl)-propane, bis(3,5-dialkyl-4-aminocyclo-hexyl)-butane, bis-(3-methyl-4-aminocyclohexyl)-methane or 3,3'-dimethyl-4,4'-diamino-dicyclohexyl-methane (commonly referred to as "BMACM"). or "MACM" hereinafter designated B), p-bis(aminocyclohexyl)-methane (commonly referred to as "PACM" hereinafter designated P), in particular Dicykan®, isopropylidenedi(cyclohexylamine) (commonly referred to as "PACP"), isophorone-diamine (hereinafter designated IPD) and 2,6-bis(aminomethyl)norbornane (commonly referred to as "BAMN"), and bis(aminomethyl)cyclohexane "BAC".

[0038] This diamine (X 1 When is a branched aliphatic diamine, the diamine is derived from an aliphatic diamine exhibiting a linear backbone containing at least 4 carbon atoms and containing one or more substituents, in particular methyl and / or ethyl.

[0039] It may be 2-methylpentamethylenediamine (MPMD), 2-methyl-1,8-octamethylenediamine (MOMD) or trimethylene (2,2,4 or 2,4,4) hexamethylenediamine (TMDA).

[0040] Repeating unit X 1 The dicarboxylic acid (Y) of Y is the same as that of the repeat unit XY and is therefore as defined above.

[0041] However, when a dicarboxylic acid of the repeating unit XY is mixed with a dicarboxylic acid Y' as described above, the weight proportion of the repeating unit XY' relative to the sum of XY and XY' is small.

[0042] Advantageously, the mass ratio XY / XY' is comprised between 90 / 10 and 9.9 / 0.1.

[0043] Similarly, repeat unit X 1 When a dicarboxylic acid of Y is mixed with another dicarboxylic acid Y' as above, X 1 Y and X 1 Repeating unit X to the sum of Y' 1 The mass fraction of Y' is small.

[0044] Advantageously, the mass ratio X 1 Y / X 1 Y' is in the range 90 / 10 to 99.9 / 0.1. Weight ratio A / X 1 Y is in the range 60 / 40 to 95 / 5.

[0045] X 1 When Y exceeds 40 wt. %, the composition is difficult to use, especially difficult to eject from the mold, crystallizes too slowly resulting in long cycle times, and is too sensitive to monomer content, especially incomplete.

[0046] X 1 When Y is below 5 wt %, the composition exhibits warpage.

[0047] Advantageously, the weight ratio A / X 1 Y is between 70 / 30 and 95 / 5.

[0048] In the sense of the present invention, glass fibers are understood to be any glass fibers, in particular those described by Frederick T. Wallenberger, James C. Watson and Hong Li, PPG industries Inc. (ASM Handbook, Vol 21: composites (#06781G), 2001 ASM International), provided that said fibers have a circular cross section.

[0049] Advantageously, said glass fibres exhibit an L / D ratio (L representing the major cross-sectional dimension of the fibre and D representing the minor cross-sectional dimension of said fibre) of less than 2, in particular less than 1.5.

[0050] Advantageously, the ratio L / D is equal to approximately 1 and the diameter is comprised between 4 μm and less than 25 μm, preferably between 4 and 15 μm.

[0051] The expression "impact modifier" is understood to mean a polyolefin-containing polymer having a flexural modulus of less than 100 MPa, measured at 23° C. according to ISO 178:2010, and a Tg (measured according to standard 11357-2 at the inflection point of the DSC thermogram) of less than 0° C., in particular without PEBA (polyether-block-amide) bound thereto or with a flexural modulus of <200 MPa. The use of PEBA alone as impact modifier in the composition would not go beyond the scope of the present invention.

[0052] The polyolefins of the impact modifier may be functionalized or unfunctionalized, or may be a mixture of at least one functionalized polyolefin and / or at least one non-functionalized polyolefin.

[0053] In particular, all or part of the polyolefins have functional groups selected from carboxylic acid, carboxylic anhydride and epoxide functional groups, in particular ethylene and propylene copolymers (EPR) having elastomeric properties, ethylene-propylene-diene copolymers (EPDM) having elastomeric properties, and ethylene / alkyl(meth)acrylate copolymers, higher ethylene-alkene copolymers, in particular ethylene-octene copolymers, ethylene-alkylacrylate-maleic anhydride terpolymers.

[0054] Advantageously, the impact modifier is chosen from Fusabond F493, Pebax® 40R53 SP01, Lotader®, in particular Lotader® 5500 or Lotader® 7500, Exxelor® VA1803, or mixtures thereof, when they are mixtures of the two, in a ratio ranging from 0.1 / 99.9 to 99.9 / 0.1.

[0055] By way of example, the impact modifier is selected from the following mixtures: Fusabond® 493 / Lotader®, in particular Fusabond® 493 / Lotader® 5500 or Fusabond® 493 / Lotader® 7500.

[0056] The impact modifier may also be a core-shell modifier, also referred to as a core-shell polymer.

[0057] "Core-shell modifier" denotes the morphology of fine particles having an elastomeric core and at least one thermoplastic shell; the size of the particles is generally smaller than a micrometer, advantageously between 150 and 500 nm inclusive.

[0058] "Core-shell type modifiers" have an acrylic or butadiene base, as opposed to impact modifiers which have a polyolefin base.

[0059] Advantageously, the proportion of impact modifiers is comprised between 0 and 10% by weight relative to the total weight of the composition.

[0060] The additives optionally used in the composition of the present invention are conventional additives used in polyamides and well known to those skilled in the art, such as fillers, colorants, stabilizers, plasticizers, surfactants, nucleating agents, pigments, brighteners, antioxidants, flame retardants, waxes and mixtures thereof.

[0061] Throughout this specification, the term "filler" excludes glass fibers in any form.

[0062] The expression "limit warping" means that the deformation is within 100*100*1mm after 7 days of deformation. 3 This means that the warpage is less than 1.5 mm, in particular less than 1 mm, when determined on a plate.

[0063] Warpage can be completely suppressed, but is generally less than 1.5 mm, in particular less than 1 mm.

[0064] The phrase "while maintaining a cycle time of the resulting composition suitable for use" means that the time required to fabricate a part from the composition of the present invention is not too long.

[0065] Specifically, the cycle time for injection molding, including the steps of injection, cooling, mold opening, and ejection of the formed article, occurs in less than 50 seconds, preferably less than 40 seconds, and especially less than 30 seconds.

[0066] It is not outside the scope of the present invention if the mounting is by compression molding.

[0067] Advantageously, the present invention provides a method for limiting warpage while maintaining a cycle time of the resulting composition suitable for use, particularly by injection: at least one semicrystalline copolyamide A / X 1 Y, [In formula: - A is C 6 -C 12 , preferably C 12 Lactam or C 6 -C 12 , preferably C 11 A repeating unit obtained by polycondensation of an amino acid, or C 4 -C 18 , especially C 4 -C 12 Aliphatic diamines (X) and C 6 -C 18 , especially C 6 -C 12 is a repeating unit XY obtained by polycondensation of an aliphatic dicarboxylic acid (Y), -X1 Y is a diamine (X) selected from arylamines, alicyclic diamines and branched aliphatic diamines; 1 ) with at least one aliphatic dicarboxylic acid (Y) identical to that of unit XY, A / X 1 Y weight ratio is included between 60 / 40 and 95 / 5] Glass fibers having a circular cross section, and Optionally, at least one impact modifier and / or at least one additive. The present invention relates to the use of a composition comprising:

[0068] The various repeating units are as defined above, but it is preferred that repeating unit A results from the polycondensation of a single lactam, or from the polycondensation of a single amino acid, or from the polycondensation of a single unit XY, and that unit X 1 The difference is that Y also corresponds to a single repeat unit.

[0069] Thus, the copolyamide in this embodiment is formed from only two repeat units.

[0070] Advantageously, the invention relates to the use of a composition as defined above, said composition comprising: from 25 to 65% by weight, in particular from 35 to 65% by weight, of said at least one copolyamide A / X 1 Y, - 35 to 75% by weight, in particular 35 to 65% by weight, of glass fibres with a circular cross section, - 0 to 10% by weight of at least one impact modifier, - 0 to 2% by weight of at least one additive Including, The sum of the percentages of the components of the composition is equal to 100%. Regarding use.

[0071] In one embodiment, X of the copolyamide of the composition 1The arylamine of the Y units is selected from meta-xylylenediamine (MXD) and para-xylylenediamine (PXD).

[0072] In another embodiment, X of the copolyamide of the composition 1 The alicyclic diamine of the Y units is selected from bis(aminomethyl)cyclohexane (BAC), 3,3'-dimethyl-4,4'-diamino-dicyclohexyl-methane (commonly referred to as BMACM or MACM), and bis-(p-aminocyclohexyl)-methane (commonly referred to as PACM).

[0073] The BAC can be a 1,3-BAC or a 1,4-BAC.

[0074] In another embodiment, X of the copolyamide of the composition 1 The alicyclic diamine of the Y units is bis(aminomethyl)cyclohexane (BAC).

[0075] The BAC can be a 1,3-BAC or a 1,4-BAC.

[0076] 1,3-BAC (or 1,3 bis(aminomethyl)cyclohexane, CAS number 2579-20-6) is a cycloaliphatic diamine monomer obtained in particular by hydrogenation of meta-xylylenediamine (MXD). 1,3-BAC exists in two isomeric forms, cis and trans, and CAS number 2579-20-6 corresponds to a mixture of isomers.

[0077] 1,4-BAC (or 1,4 bis(aminomethyl)cyclohexane, CAS number 2549-07-9) is a cycloaliphatic diamine monomer obtained in particular by hydrogenation of para-xylylenediamine (PXD). 1,4-BAC exists in two isomeric forms, cis and trans, and CAS number 2549-07-9 corresponds to the mixture of isomers.

[0078] Advantageously, the 1,3 BAC or 1,4 BAC used in the compositions of the invention is a mixture of cis and trans isomers in a respective ratio of 0.1 / 99.9 to 99.9 / 0.1, in particular 75 / 25 to 25 / 75.

[0079] The 1,3-BAC or 1,4-BAC used in the compositions of the present invention is a mixture of cis and trans isomers, which is the diamine X 1 It does not correspond to a mixture of diamines X, but to a single diamine X. 1 It is of course understood that this corresponds to

[0080] Advantageously, the proportion of cis isomers in the 1,3 BAC is greater than 60%, preferably greater than 70%, in particular greater than 80%, especially greater than 90%.

[0081] Advantageously, the proportion of trans isomers in the 1,4 BAC is greater than 60%, preferably greater than 70%, in particular greater than 80% and in particular greater than 90%.

[0082] In another embodiment, the branched aliphatic diamine is selected from 2-methyloctane diamine (MOMD), methylpentamethylene diamine (MPMD) and trimethylhexanmethylene diamine (TMDA).

[0083] In an advantageous embodiment, the diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (MPMD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0084] Advantageously, A is a repeating unit XY.

[0085] Advantageously, A is a repeating unit XY and said diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0086] In one embodiment, A is a repeat unit XY, and (Y) is C 6 -C 12 An aliphatic dicarboxylic acid (Y), in particular (Y) corresponds to sebacic acid.

[0087] Advantageously, A is a repeating unit XY, (Y) is C 6 -C 12 aliphatic dicarboxylic acid (Y), and the diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0088] Advantageously, A is a repeating unit XY, (Y) corresponds to sebacic acid and said diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0089] In one embodiment, (X) is C 6 -C 12 It corresponds to a diamine, in particular hexamethylenediamine or decanediamine.

[0090] Advantageously, A is a repeating unit XY, (Y) is C 6 -C 12 (Y) is an aliphatic dicarboxylic acid, (X) is C 6 -C 12 It corresponds to a diamine.

[0091] Advantageously, A is a repeating unit XY, (Y) is C 6 -C 12 (Y) is an aliphatic dicarboxylic acid, and (X) corresponds to hexamethylenediamine or decanediamine.

[0092] Advantageously, A is a repeating unit XY, (Y) is C 6 -C12 (Y) is an aliphatic dicarboxylic acid, (X) is C 6 -C 12 The diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0093] Advantageously, A is a repeating unit XY, (Y) being sebacic acid or dodecanedioic acid and (X) being C 6 -C 12 The diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0094] Advantageously, A is a repeating unit XY, (Y) being sebacic acid and (X) being C 6 -C 12 The diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0095] Advantageously, A is a repeating unit XY, (Y) being dodecanedioic acid and (X) being C 6 -C 12 The diamine (X 1 ) corresponds to meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0096] Advantageously, A is a repeating unit XY, (Y) is C 6 -C 12(Y) is an aliphatic dicarboxylic acid, (X) is hexamethylenediamine or decanediamine, and the diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0097] Advantageously, A is a repeating unit XY, (Y) being sebacic acid or dodecanedioic acid and (X) corresponding to hexamethylenediamine or decanediamine, said diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0098] Advantageously, A is a repeating unit XY, (Y) being sebacic acid and (X) corresponding to hexamethylenediamine or decanediamine, said diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0099] Advantageously, A is a repeating unit XY, (Y) is sebacic acid and (X) corresponds to hexamethylenediamine, said diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0100] Advantageously, A is a repeating unit XY, (Y) being sebacic acid and (X) corresponding to decanediamine, said diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0101] Advantageously, A is a repeating unit XY, (Y) being dodecanedioic acid and (X) corresponding to hexamethylenediamine or decanediamine, said diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0102] Advantageously, A is a repeating unit XY, (Y) is dodecanedioic acid and (X) corresponds to hexamethylenediamine, said diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0103] Advantageously, A is a repeating unit XY, (Y) being dodecanedioic acid and (X) corresponding to decanediamine, said diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0104] In one embodiment, A is a repeat unit resulting from the polycondensation of a lactam or an amino acid.

[0105] Advantageously, A is C 6 -C 12 It is a lactam, in particular caprolactam or lauryllactam.

[0106] Advantageously, A is C 6 -C 12 lactam, in particular caprolactam or lauryllactam, 1) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0107] Advantageously, A is lauryllactam and said diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0108] Advantageously, A is caprolactam and said diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0109] Advantageously, A is C 6 -C 12 Amino acids, particularly 11-aminoundecanoic acid.

[0110] Advantageously, A is C 6 -C 12 The diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0111] Advantageously, A is 11-aminoundecanoic acid and said diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0112] In one embodiment, the at least one additive is selected from fillers, colorants, stabilizers, plasticizers, surfactants, nucleating agents, pigments, brighteners, antioxidants, lubricants, waxes, and mixtures thereof.

[0113] The fillers can be antistatic fillers, silica, graphite, expanded graphite, carbon black, glass beads, kaolin, magnesia, slag, wollastonite, nanofillers (carbon nanotubes).

[0114] It should be understood that, for purposes of the present invention, glass beads are not considered to be glass fibers having a circular cross section, and therefore are not glass fibers having a circular cross section.

[0115] The stabilizer may be an organic or inorganic stabilizer.

[0116] The plasticizer is, for example, the octyl ester of para-oxybenzoic acid or N-butylbenzenesulfonamide.

[0117] Antioxidants are agents that prevent the thermal and / or photo-oxidation of polymers in a thermoplastic matrix.

[0118] Nucleating agents such as metal oxides, metal particles, silica, alumina, clay or talc are known.

[0119] The lubricant may contain a stearate or wax binder.

[0120] The flame retardant may be a metal salt selected from metal phosphinic acids, metal salts of diphosphinic acids, polymers comprising at least one metal salt of phosphinic acids, polymers comprising at least one metal salt of diphosphinic acids.

[0121] The wax may in particular be an amorphous wax, such as beeswax, silicone wax, polyethylene wax, oxidized polyethylene wax, ethylene copolymers, montan wax and polyether wax.

[0122] According to one aspect, the present invention relates to a composition, in particular for mounting by injection molding, comprising: from 25 to 65% by weight, in particular from 35 to 65% by weight, of at least one copolyamide A / X as defined above 1 Y, - 35 to 75% by weight, in particular 35 to 65% by weight, of glass fibres with a circular cross section, - 0 to 10% by weight of at least one impact modifier, - 0 to 2% by weight of at least one additive Including, The sum of the percentages of each component of the composition is equal to 100%. Concerning the composition.

[0123] Scope of use A, X, YX 1 All the characteristics specified for the glass fibers, impact modifiers and additives apply to the composition as such.

[0124] Advantageously, cyclohexanedicarboxylic acid is excluded from the definition of the aliphatic dicarboxylic acids (Y) present in the composition.

[0125] Advantageously, said composition, in particular for implementation by injection molding, comprises: from 25 to 64.9% by weight, in particular from 35 to 64.9% by weight, of at least one copolyamide A / X as defined above 1 Y, - from 35 to 74.9% by weight, in particular from 35 to 64.9% by weight, of glass fibres with a circular cross section, - 0.1 to 10% by weight of at least one impact modifier, - 0 to 2% by weight of at least one additive Includes.

[0126] Advantageously, said composition, in particular for implementation by injection molding, comprises: from 25 to 64.9% by weight, in particular from 35 to 64.9% by weight, of at least one copolyamide A / X as defined above 1 Y, - from 35 to 74.9% by weight, in particular from 35 to 64.9% by weight, of glass fibres with a circular cross section, - 0 to 10% by weight of at least one impact modifier, - 0.1 to 2% by weight of at least one additive Includes.

[0127] Advantageously, said composition, in particular for implementation by injection molding, comprises: from 25 to 64.8% by weight, in particular from 35 to 64.8% by weight, of at least one copolyamide A / X as defined above 1 Y, - from 35 to 74.8% by weight, in particular from 35 to 64.8% by weight, of glass fibres with a circular cross section, - 0.1 to 10% by weight of at least one impact modifier, - 0.1 to 2% by weight of at least one additive Includes.

[0128] Advantageously, the unit A of the composition, in particular for implementation by injection moulding, is a repeating unit XY.

[0129] Advantageously, the units A of the composition, in particular for implementation by injection moulding, are repeating units XY, (Y) being in particular C corresponding to sebacic acid. 6 -C 12 It is an aliphatic dicarboxylic acid (Y).

[0130] The composition units (X), in particular for implementation by injection molding, are in particular 6 -C 12 It corresponds to a diamine, in particular hexamethylenediamine or decanediamine.

[0131] In one embodiment, the units of the composition (X 1) is selected from bis(aminomethyl)cyclohexane (BAC), 3,3′-dimethyl-4,4′-diamino-dicyclohexyl-methane (commonly referred to as BMACM or MACM), and bis-(p-aminocyclohexyl)-methane (commonly referred to as PACM).

[0132] The BAC can be a 1,3-BAC or a 1,4-BAC.

[0133] Advantageously, the units (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0134] Advantageously, the unit A of the composition for mounting by injection molding is a repeating unit XY, (Y) being C 6 -C 12 aliphatic dicarboxylic acid (Y), and the diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0135] Advantageously, the units A of the composition, in particular for implementation by injection molding, are repeating units XY, (Y) corresponding to sebacic acid and said diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0136] In one embodiment, (X) is C 6 -C 12 It corresponds to a diamine, in particular hexamethylenediamine or decanediamine.

[0137] Advantageously, the unit A of the composition, in particular for implementation by injection molding, is a repeating unit XY, (Y) being C 6 -C 12 (Y) is an aliphatic dicarboxylic acid, (X) is C 6 -C 12 It corresponds to a diamine.

[0138] Advantageously, the unit A of the composition, in particular for implementation by injection molding, is a repeating unit XY, (Y) being C 6 -C 12 (Y) is an aliphatic dicarboxylic acid, and (X) corresponds to hexamethylenediamine or decanediamine.

[0139] Advantageously, the unit A of the composition, in particular for implementation by injection molding, is a repeating unit XY, (Y) being C 6 -C 12 (Y) is an aliphatic dicarboxylic acid, (X) is C 6 -C 12 The diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0140] Advantageously, the unit A of the composition, in particular for implementation by injection molding, is a repeating unit XY, (Y) being sebacic acid and (X) being C 6 -C 12 The diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0141] Advantageously, the unit A of the composition, in particular for implementation by injection molding, is a repeating unit XY, (Y) being C 6 -C 12 aliphatic dicarboxylic acid (Y), (X) corresponds to hexamethylenediamine or decanediamine, said diamine (X 1) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0142] Advantageously, the unit A of the composition, in particular for implementation by injection molding, is a repeating unit XY, (Y) being sebacic acid and (X) corresponding to hexamethylenediamine or decanediamine, said diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0143] Advantageously, the units A of the composition, in particular for implementation by injection moulding, are repeating units resulting from the polycondensation of lactams or amino acids.

[0144] Advantageously, the units A of the composition, in particular for implementation by injection molding, are 6 -C 12 It is a repeating unit resulting from the polycondensation of a lactam, particularly caprolactam or lauryllactam.

[0145] Advantageously, the units A of the composition, in particular for implementation by injection molding, are 6 -C 12 are repeating units obtained by polycondensation of lactams, in particular caprolactam or lauryllactam, 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0146] Advantageously, the units A of the composition, in particular for implementation by injection molding, are repeat units resulting from the polycondensation of lauryllactam, said diamine (X 1) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0147] Advantageously, the units A of the composition, in particular for implementation by injection molding, are repeat units resulting from the polycondensation of caprolactam, said diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0148] Advantageously, A is C 6 -C 12 Amino acids, particularly 11-aminoundecanoic acid.

[0149] Advantageously, the units A of the composition, in particular for implementation by injection molding, are 6 -C 12 The diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0150] Advantageously, the units A of the composition, in particular for implementation by injection molding, are repeat units resulting from the polycondensation of 11-aminoundecanoic acid, said diamine (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

[0151] In particular, said at least one additive in a composition, especially for mounting by injection molding, is selected from fillers, colorants, stabilizers, plasticizers, surfactants, nucleating agents, pigments, brighteners, antioxidants, lubricants, waxes and mixtures thereof.

[0152] According to another aspect, the present invention relates to the use of the composition defined above for forming a single layer structure or at least one layer of a multilayer structure.

[0153] All the features defined above apply to this use.

[0154] Advantageously, said structure is presented in the form of an ejection part.

[0155] The injected part may be an electrical part, in particular a phone shell, or a part of a computer or a tablet or a smartwatch.

[0156] According to another aspect, the present invention relates to an object obtained from the composition defined above.

[0157] According to another aspect, the invention relates to a method for molding an object as defined above, characterized in that it comprises a step of injection molding of a composition as defined above.

[0158] According to another aspect, the invention relates to the use of an object as defined above in the electrical and / or electronic field. [Brief description of the drawings]

[0159] [Figure 1A] Two plates (100*100*1 mm3) were obtained injected with a composition according to the invention (similar to the plates I1 to I8) and show a warpage measured as described in Example 1. The plates have been injected with one of the compositions I1 to I8 (similar to the plates of these different compositions) with a limited warpage of less than 1 mm. [Figure 1B] Two plates (100*100*1 mm3) were obtained injected with composition C1 and show a warpage measured as described in example 1. The plates injected with C1 have a high warpage, more than 5 mm. EXAMPLES

[0160] Example 1: Warpage evaluation after 7 days of (co)polyamide compositions containing CoPA 610 / 1,3-BAC10, 610 / 1,4-BAC10, 610 / MXD10, 610 / PXD10, 610 / MPMD10, 610 / B10, and glass fibers with a circular cross section synthesis Various polyamides (comparative) and copolyamides were prepared according to conventional techniques for polyamide and copolyamide synthesis.

[0161] Synthesis of CoPa 610 / MXD10, representative of various copolyamides: Hexamethylenediamine, m-xylylenediamine and sebacic acid monomer are charged together in the reactor according to the desired mass ratio. The medium is first inerted to remove oxygen that may cause yellowing or secondary reactions. Water can also be charged to improve heat exchange. Two temperature increases and pressure plateaus are carried out. Temperature (T°) and pressure conditions are selected to allow the medium to melt. After reaching a maintenance state, degassing occurs to allow the polycondensation reaction. The medium becomes gradually viscous and the formed reaction water is purged with nitrogen or evacuated. When a quiescent state is reached for the desired viscosity, the stirring is stopped and extrusion and granulation can begin. The resulting granules are then compounded with glass fibers.

[0162] Compounding The compositions were prepared by mixing the polymer granules when melted. The mixtures were made by compounding in a twin-screw co-rotating MC26 extruder with a flat temperature profile (T°) of 270° C. The screw speed was 250 rpm.

[0163] The introduction of glass fibers (Nittobo CSX3J451S0) with a circular cross section is achieved by applying a force in the lateral direction.

[0164] injection 100*100*1mm by injecting different compositions 3 The plates were prepared. -Injection temperature (supply / nozzle): 250 / 270℃ -Molding temperature: 50℃

[0165] The cycle time is adjusted according to the composition to allow for injection of the composition, which should be less than 50 seconds to be consistent with the present invention.

[0166] Warpage was evaluated according to the method described below. The injection plate is placed on the table. The operator presses three corners of the plate to raise the fourth. Then the difference between the table surface and the sample is measured. See the arrows in Figure 1.

[0167] This measurement is performed 7 days after injection. In the sample on the left in FIG. 1A, warpage is limited and is less than 1 mm.

[0168] intrinsic viscosity - The intrinsic viscosity is measured in m-cresol. This method is well known to those skilled in the art. It follows the ISO standard 307:2007, but with different solvents (m-cresol instead of sulfuric acid), temperatures (20°C) and concentrations (0.5% by weight). The viscosity is expressed in dL / g.

[0169] The results are shown in Table 1 below. TIFF0007680484000001.tif173153

[0170] Example 2: Warpage evaluation of PA11 composition 11 with intrinsic viscosity IV=1.08 or copolyamide compositions containing PA11 (CoPA11 / MXD10 (50 / 50, IV=0.93), 11 / MXD10 (80 / 20, IV=0.96), 11 / 1,3-BAC10 (80 / 20, IV=1.10) and 11 / PXD10 (80 / 20, IV=1.15)). Synthesis, compounding and injection are carried out as described in Example 1, except that the mold temperature is 45°C and the injection temperature is 260°C.

[0171] The results are shown in Table II below. TIFF0007680484000002.tif83153

Claims

1. To limit warpage while maintaining a cycle time for the resulting composition suitable for use by injection; At least one semicrystalline copolyamide A / X １ Y. [In the formula: - A has at least one C ６ -C １２ Polycondensation of lactam or at least one C ６ -C １２ It is a repeating unit obtained by polycondensation of amino acids, - X １ Y is a diamine selected from aryl diamines, alicyclic diamines, and branched aliphatic diamines (X １ (Y) is a repeating unit obtained by polycondensation of at least one aliphatic dicarboxylic acid (Y), A / X １ Y weight ratio is included between 60 / 40 and 95 / 5] Glass fibers having a circular cross section, and Optionally, at least one impact modifier and / or at least one additive.

4. Use of a composition comprising: wherein (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

2. To limit warpage while maintaining a cycle time for the resulting composition suitable for use by injection; At least one semicrystalline copolyamide A / X １ Y. [In the formula: - A is C ６ -C １２ Polycondensation of lactam or C ６ -C １２ It is a repeating unit obtained by polycondensation of amino acids, - X １ Y is a diamine selected from aryl diamines, alicyclic diamines, and branched aliphatic diamines (X １ (Y) is a repeating unit obtained by polycondensation of at least one aliphatic dicarboxylic acid (Y), A / X １ Y weight ratio is included between 60 / 40 and 95 / 5] Glass fibers having a circular cross section, and Optionally, at least one impact modifier and / or at least one additive.

4. Use of a composition comprising: wherein (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

3. The composition comprises: from 25 to 65% by weight of said at least one semicrystalline copolyamide A / X; １ Y. - 35 to 75% by weight of glass fibres with a circular cross section, - 0 to 10% by weight of at least one impact modifier, - 0 to 2% by weight of at least one additive Including, 3. Use according to claim 1 or 2, characterized in that the sum of the percentages of the individual components of the composition is equal to 100%.

4. (Y) is C ６ -C １２ 4. Use according to any one of claims 1 to 3, characterized in that it is an aliphatic dicarboxylic acid.

5. 5. Use according to any one of claims 1 to 4, characterized in that the at least one additive is selected from fillers, colorants, stabilizers, plasticizers, surfactants, nucleating agents, pigments, brighteners, antioxidants, lubricants, flame retardants, waxes and mixtures thereof.

6. 1. A composition for limiting warpage while maintaining a cycle time for the resulting composition suitable for use by injection, comprising: from 25 to 65% by weight of at least one semicrystalline copolyamide A / X １ Y. [In the formula: - A has at least one C ６ -C １２ Lactam or at least one C ６ -C １２ It is a repeating unit obtained by polycondensation of amino acids, - X １ Y is a diamine selected from aryl diamines, alicyclic diamines, and branched aliphatic diamines (X １ (Y) is a repeating unit obtained by polycondensation of at least one aliphatic dicarboxylic acid (Y), A / X １ Y weight ratio is included between 60 / 40 and 95 / 5] - 35 to 75% by weight of glass fibres with a circular cross section, - 0 to 10% by weight of at least one impact modifier, - 0 to 2% by weight of at least one additive Including, A composition, characterized in that the sum of the percentages of each component of the composition is equal to 100% and (X 1 ) is selected from meta-xylylenediamine (MXD), para-xylylenediamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylenediamine (MPMD).

7. 7. The composition of claim 6, wherein the at least one additive is selected from fillers, colorants, stabilizers, plasticizers, surfactants, nucleating agents, pigments, brighteners, antioxidants, lubricants, flame retardants, waxes, and mixtures thereof.

8. 6. Use according to any one of claims 1 to 5 for forming a monolayer structure or at least one layer of a multilayer structure.

9. 9. Use according to claim 8, characterised in that the structure is in the form of an injected part.

10. A method for manufacturing an object comprising the use according to any one of claims 1 to 5.

11. The method according to claim 10, wherein the object is an object in the electrical and / or electronic field.

Images