Compositions based on polyamides and glass fibers and their use in the sanitary and water sectors

Abstract

The present invention relates to a molding composition comprising by weight: a) 20 to 60% of at least one long-chain aliphatic polyamide having a carbon atom to nitrogen atom ratio greater than or equal to 9, said at least one polyamide having an inherent viscosity in solution less than or equal to 1.3, as determined according to ISO 307:2007 at a temperature of 20°C; b) 40 to 75% of glass fibers; and c) 0 to 5% by weight of at least one additive, the sum of the proportions of each constituent of said composition being equal to 100%, excluding an amorphous polyamide and a microcrystalline polyamide.

Description

Title of the invention: COMPOSITIONS BASED ON POLYAMIDES AND GLASS FIBERS AND THEIR USE IN THE SANITARY AND WATER SECTORS Technical field

[0001] The present invention relates to molding compositions based on polyamides and glass fibers and their use in the field of sanitation, transport or distribution of water, in particular drinking water, at a temperature less than or equal to 60°C. Prior art

[0002] Brass is a widely used material in the sanitary sector, but this material is expensive. Its use can also involve the release of heavy metals into water, particularly drinking water. For these reasons, brass is being replaced by plastic materials (such as PPSU, PVDF, PA).

[0003] Thus, application US 2010 / 0249307 describes polyamide compositions reinforced with glass fibers for use in the field of drinking water, said polyamide being a mixture of semi-crystalline aliphatic polyamide and amorphous transparent polyamide, in particular based on cycloaliphatic diamines such as 3,3'-dimethyl-4,4'-diamino-dicyclohexyl-methane (called BMACM, MACM or B), p-bis(aminocyclohexyl)-methane commonly (called PACM or P) and isophorone-diamine (called IPD).

[0004] Application US2010237271 describes polyamide compositions reinforced with glass fibers for use in the field of drinking water, said polyamide being a mixture of semi-crystalline aliphatic polyamide and amorphous transparent polyamide chosen from B9-36, B9-36 / P9-36, 12 / BI and 12 / BT.

[0005] International application WO 2018 / 011291 describes compositions comprising a polyamide and a condensation product of a phenol and a carbonyl compound.

[0006] None of these applications describes molding compositions based on long-chain aliphatic polyamides and glass fibers having improved mechanical properties at temperatures less than or equal to 60°C, in particular in terms of final strength or breaking stresses, before or after immersion in drinking water.

[0007] The present invention therefore relates to a molding composition, comprising by weight:

[0008] a) 20 to 60%, in particular from 20 to 50%, in particular 25 to 39.9% of at least one long-chain aliphatic polyamide having a number of carbon atoms per nitrogen atom greater than or equal to 9, in particular greater than or equal to 10,

[0009] said at least one polyamide having an inherent viscosity in solution of less than or equal to 1.3, in particular less than or equal to 1.25, as determined according to standard ISO 307: 2007 at a temperature of 20°C.

[0010] b) 40 to 75% of glass fibers, in particular 50 to 75%, in particular 60 to 70% of glass fibers, and

[0011] c) 0 to 5% by weight, preferably 0.1 to 5% by weight of at least one additive,

[0012] the sum of the proportions of each constituent of said composition being equal to 100%.

[0013] The inventors have therefore found that the selection of at least one long-chain aliphatic polyamide having a particular inherent viscosity in solution with a particular range of glass fibers makes it possible to constitute a composition which, after injection, has improved mechanical properties at temperatures less than or equal to 60°C, in particular in terms of strength in finishing or breaking stresses before or after immersion in drinking water.

[0014] The inherent viscosity in solution (iv) is determined according to ISO 307:2007 as amended in

[0015] that the solvent is m-cresol rather than sulfuric acid, and that the concentration is 0.5% by weight and that the temperature is 20°C.

[0016] A molding composition according to the invention is a composition transformed for example by injection, injection blow molding, expansion molding and rotational molding. Regarding aliphatic polyamide

[0017] The molding composition comprises from 20 to 60%, in particular from 20 to 50%, in particular 25 to 39.9% of at least one long-chain aliphatic polyamide having a number of carbon atoms per nitrogen atom greater than or equal to 9, in particular greater than or equal to 10.

[0018] The nomenclature used to define polyamides is described in the ISO 1874-1:2011 standard "Plastics - Polyamide (PA) materials for molding and extrusion - Part 1: Designation", in particular on page 3 (tables 1 and 2) and is well known to those skilled in the art.

[0019] The polyamide may be a homopolyamide or a copolyamide or a mixture thereof.

[0020] Advantageously, said polyamide is a semi-crystalline polyamide or copolyamide.

[0021] The expression “semi-crystalline”, within the meaning of the invention, designates a (co)polyamide which has a melting temperature (Tf) in DSC according to the ISO 11357-3:2013 standard, and an enthalpy of crystallization during the cooling step at a speed of 20K / min in DSC measured according to ISO 11357-3 of 2013 greater than 20 J / g, preferably greater than 30 J / g.

[0022] Said polyamide is derived from a repeating unit obtained by polycondensation:

[0023] of at least one amino acid in C9 to C[8, preferably in C10 to C[8, more preferably in C10 to C12, or

[0024] of at least one C9 to C18 lactam, preferably C10 to C18, more preferably C10 to C12, or

[0025] of at least one diamine Ca in C4-C36, preferably C6-Ci8, preferably C6-C12, more preferably C10-Ci2, with at least one dicarboxylic acid Cb in C4-C36, preferably C6-Ci8, preferably C6-Ci2, more preferably Ciq-Ci2,

[0026] or a mixture thereof,

[0027] provided that the number of carbon atoms per nitrogen atom of the repeating unit is greater than or equal to 9, in particular greater than or equal to 10.

[0028] Advantageously, the long-chain aliphatic polyamide is obtained by polycondensation:

[0029] of at least one amino acid in C9 to C18, preferably in C10 to C18, in particular in C10 to C12, or

[0030] of at least one C9 to C18 lactam, preferably C10 to C18, in particular C10 to C12.

[0031] A C9 to C18 amino acid is in particular 9-aminononanoic acid, 10-aminodecanoic acid, 10-aminoundecanoic acid, 12-aminododecanoic acid and 11-aminoundecanoic acid as well as its derivatives, in particular N-heptyl-11-aminoundecanoic acid.

[0032] A C9 to C18 lactam is notably lauryllactam.

[0033] Said at least one C4-C36 diamine Ca may in particular be chosen 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, octadecenediamine, eicosanediamine, docosanediamine and the diamines obtained from of fatty acids.

[0034] Advantageously, said at least one diamine Ca is C6-C18 and chosen from 1,6-hexamethylenediamine, 1,7-heptamethylediamine, 1,8-octamethylediamine, 1,9-nonamethylediamine, 1,10-decamethylediamine, 1,11-undecamethylediamine, 1,12-dodecamethylediamine, 1,13-tridecamethylediamine mine, 1,14-tetradecamethyldiamine, 1,16-hexadecamethyldiamine and 1,18-octadecamethyldiamine.

[0035] Said at least one Cb to C36 dicarboxylic acid may be chosen from succinic acid, glutaric acid, adipic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, brassylic acid, tetradecanedioic acid, pentadecanedioic acid, hexadecanedioic acid, octadecanedioic acid, octadecenediamine, eicosanediamine, docosanediamine and diamines obtained from fatty acids.

[0036] Advantageously, said at least one dicarboxylic acid Cb is C6 to C18 and is chosen from adipic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, brassylic acid, tetradecanedioic acid, pentadecanedioic acid, hexadecanedioic acid, octadecanedioic acid.

[0037] In particular, the long-chain aliphatic polyamide is chosen from:

[0038] polyamide 1010 (PA1010), polyamide 1012 (PA1012), polyamide 1212 (PA1012), polyamide 11 (PAU), polyamide 12 (PA12), or a mixture thereof or a copolyamide thereof.

[0039] Advantageously, the polyamide is in particular PA11 and PA12.

[0040] In one embodiment, said long chain aliphatic polyamide is a blend of two polyamides in a weight ratio range of 5 / 95 to 95 / 5.

[0041] Advantageously, said mixture is a mixture of two identical polyamides having the same number of carbon atoms per nitrogen atom but with an inherent viscosity in solution of one of the two polyamides greater than 1.3 but on the condition that the mixture meets the condition of having an inherent viscosity in solution less than or equal to 1.3, in particular less than or equal to 1.25. Regarding glass fibers

[0042] The glass fibers are present from 40% to 75%, in particular from 50 to 75%, in particular from 60 to 70% by weight relative to the total weight of the composition.

[0043] The glass fibers can be solid and / or hollow, advantageously they are solid.

[0044] The glass fibers are advantageously short.

[0045] The short glass fibers preferably have a length of between 2 and 13 mm, preferably 3 to 8 mm before implementing the compositions.

[0046] Advantageously, the short glass fibers have a fiber length of 120 to 350 pm.

[0047] This fiber length of 120 to 350 pm is measured on the compound.

[0048] The short glass fibers can be circular or non-circular in cross-section.

[0049] A fiber with a circular section is defined as a fiber having at any point on its circumference a distance equal to the center of the fiber and therefore represents a perfect or near-perfect circle.

[0050] Any glass fiber not having this perfect or almost perfect circle is therefore defined as a fiber with a non-circular section.

[0051] Examples of fibers with a non-circular cross-section, but not limited to, are non-circular fibers, for example, having an elliptical, oval or cocoon shape, star fibers, flake fibers, flat fibers, cruciforms, a polygon and a ring.

[0052] Fiberglass can be:

[0053] - either with a circular section of diameter between 4 μm and 25 μm, preferably between 4 and 3 pm.

[0054] - either with a non-circular section with an L / D ratio (L representing the largest dimension of the cross-section of the fiber and D the smallest dimension of the cross-section of said fiber) between 2 and 8, in particular between 2 and 4. L and D can be measured by scanning electron microscopy (SEM).

[0055] Advantageously, the glass fibers are circular. Regarding the additive

[0056] The at least one additive is optionally present from 0 to 5% by weight, in particular from 0.1 to 5%, relative to the total weight of the composition.

[0057] The additive is chosen from fillers, colorants, stabilizers, plasticizers, surfactants, nucleating agents, pigments, brighteners, antioxidants, lubricants, flame retardants, natural waxes, laser marking additives, and mixtures thereof.

[0058] For example, the stabilizer may be a UV stabilizer, an organic stabilizer or more generally a combination of organic stabilizers, such as a phenol-type antioxidant (for example of the type of irganox® 1010 from the company Ciba-BASF).

[0059] It would not be outside the scope of the invention to use a mixture of plasticizers.

[0060] By way of example, the fillers can be chosen from carbon black, talc, pigments, metal oxides (titanium oxide). Regarding the molding composition

[0061] Throughout the description, all percentages of the composition are indicated by weight.

[0062] The molding composition comprises by weight:

[0063] a) 20 to 60%, in particular from 20 to 50%, in particular 25 to 39.9% of at least one long-chain aliphatic polyamide having a number of carbon atoms per nitrogen atom greater than or equal to 9, in particular greater than or equal to 10,

[0064] said at least one polyamide having an inherent viscosity in solution less than or equal to 1.3, in particular less than or equal to 1.25, as determined according to standard ISO 307: 2007 at a temperature of 20°C.

[0065] b) 40 to 75% of glass fibers, in particular 50 to 75%, in particular 60 to 70% of glass fibers, and

[0066] c) 0 to 5% by weight, preferably 0.1 to 5% by weight of at least one additive,

[0067] the sum of the proportions of each constituent of said composition being equal to 100%,

[0068] excluding an amorphous polyamide and a microcrystalline polyamide.

[0069] An amorphous polyamide within the meaning of the invention designates an amorphous transparent polyamide having only a glass transition temperature (no melting temperature (Tf)), or a very slightly crystalline polyamide having a glass transition temperature and a melting point such that the crystallization enthalpy during the cooling step at a rate of 20K / min in differential scanning calorimetry (DSC) measured according to the ISO 11357-3:2013 standard is less than 20 J / g. The glass transition temperature (Tg) measured by DSC at a heating rate of 20K / min according to the ISO 11357-2:2013 standard for these polyamides is greater than 75°C.

[0070] A microcrystalline polyamide within the meaning of the invention has a crystallization enthalpy during the cooling step at a rate of 20K / min in differential scanning calorimetry (DSC) measured according to the ISO 11357-3:2013 standard is less than 20 J / g.

[0071] A microcrystalline polyamide is therefore excluded from said molding composition.

[0072] An amorphous polyamide is for example a polyamide based on at least one cycloaliphatic diamine such as MACM, PACM, and IPD.

[0073] An amorphous polyamide is therefore excluded from said molding composition.

[0074] A microcrystalline polyamide and an amorphous polyamide in a mixture are therefore excluded from said molding composition.

[0075] Advantageously, a polyamide other than an aliphatic polyamide, in particular semi-crystalline, is excluded from the composition.

[0076] Advantageously, a condensation product of a phenol and a carbonyl compound is excluded from the composition.

[0077] Advantageously, a polyamide other than an aliphatic polyamide, in particular semi-crystalline, and a condensation product of a phenol and a carbonyl compound are excluded from the composition.

[0078] In one embodiment, the molding composition consists of (in weight) :

[0079] a) 20 to 60%, in particular from 20 to 50%, in particular 25 to 39.9% of at least one long-chain aliphatic polyamide having a number of carbon atoms per nitrogen atom greater than or equal to 9, in particular greater than or equal to 10,

[0080] said at least one polyamide having an inherent viscosity in solution less than or equal to 1.3, in particular less than or equal to 1.25, as determined according to standard ISO 307: 2007 at a temperature of 20°C.

[0081] b) 40 to 75% of glass fibers, in particular 50 to 75%, in particular 60 to 70% of glass fibers, and

[0082] c) 0 to 5% by weight, preferably 0.1 to 5% by weight of at least one additive,

[0083] the sum of the proportions of each constituent of said composition being equal to 100%.

[0084] It is quite obvious that when the composition is “made up of”, the exclusions no longer have any place since the composition can only contain the constituents a), b) and c).

[0085] In a first variant, the molding composition comprises by weight:

[0086] a) 20 to 50%, in particular 25 to 39.9% of at least one long-chain aliphatic polyamide having a number of carbon atoms per nitrogen atom greater than or equal to 9, in particular greater than or equal to 10,

[0087] said at least one polyamide having an inherent viscosity in solution less than or equal to 1.3, in particular less than or equal to 1.25, as determined according to standard ISO 307: 2007 at a temperature of 20°C.

[0088] b) 50 to 75%, in particular 60 to 70% of glass fibers, and

[0089] c) 0 to 5% by weight, preferably 0.1 to 5% by weight of at least one additive,

[0090] the sum of the proportions of each constituent of said composition being equal to 100%,

[0091] excluding an amorphous polyamide and a microcrystalline polyamide.

[0092] In one embodiment of this first variant, the molding composition comprises by weight:

[0093] a) 20 to 49.9%, in particular 25 to 39.9% of at least one long-chain aliphatic polyamide having a number of carbon atoms per nitrogen atom greater than or equal to 9, in particular greater than or equal to 10,

[0094] said at least one polyamide having an inherent viscosity in solution less than or equal to 1.3, in particular less than or equal to 1.25, as determined according to standard ISO 307: 2007 at a temperature of 20°C.

[0095] b) 50 to 75%, in particular 60 to 70% of glass fibers, and

[0096] c) 0.1 to 5% by weight of at least one additive,

[0097] the sum of the proportions of each constituent of said composition being equal to 100%,

[0098] excluding an amorphous polyamide and a microcrystalline polyamide.

[0099] In another embodiment of this first variant, the composition consists of:

[0100] a) 20 to 50%, in particular 25 to 39.9% of at least one long-chain aliphatic polyamide having a number of carbon atoms per nitrogen atom greater than or equal to 9, in particular greater than or equal to 10,

[0101] said at least one polyamide having an inherent viscosity in solution less than or equal to 1.3, in particular less than or equal to 1.25, as determined according to standard ISO 307: 2007 at a temperature of 20°C.

[0102] b) 50 to 75%, in particular 60 to 70% of glass fibers, and

[0103] c) 0 to 5% by weight, preferably 0.1 to 5% by weight of at least one additive,

[0104] the sum of the proportions of each constituent of said composition being equal to 100%.

[0105] In yet another embodiment of this first variant, the composition consists of:

[0106] a) 20 to 49.9%, in particular 25 to 39.9% of at least one long-chain aliphatic polyamide having a number of carbon atoms per nitrogen atom greater than or equal to 9, in particular greater than or equal to 10,

[0107] said at least one polyamide having an inherent viscosity in solution less than or equal to 1.3, in particular less than or equal to 1.25, as determined according to standard ISO 307: 2007 at a temperature of 20°C.

[0108] b) 50 to 75%, in particular 60 to 70% of glass fibers, and

[0109] c) 0.1 to 5% by weight of at least one additive,

[0110] the sum of the proportions of each constituent of said composition being equal to 100%.

[0111] In a second variant, the molding composition comprises by weight:

[0112] a) 25 to 40%, in particular 25 to 39.9% of at least one long-chain aliphatic polyamide having a number of carbon atoms per nitrogen atom greater than or equal to 9, in particular greater than or equal to 10,

[0113] said at least one polyamide having an inherent viscosity in solution less than or equal to 1.3, in particular less than or equal to 1.25, as determined according to standard ISO 307: 2007 at a temperature of 20°C.

[0114] b) 60 to 70% glass fibers, and

[0115] c) 0 to 5% by weight, preferably 0.1 to 5% by weight of at least one additive,

[0116] the sum of the proportions of each constituent of said composition being equal to 100%,

[0117] excluding an amorphous polyamide and a microcrystalline polyamide.

[0118] In one embodiment of this second variant, the molding composition comprises by weight:

[0119] a) 25 to 39.9% of at least one long-chain aliphatic polyamide having a number of carbon atoms per nitrogen atom greater than or equal to 9, in particular greater than or equal to 10,

[0120] said at least one polyamide having an inherent viscosity in solution less than or equal to 1.3, in particular less than or equal to 1.25, as determined according to standard ISO 307: 2007 at a temperature of 20°C.

[0121] b) 60 to 70% glass fibers, and

[0122] c) 0.1 to 5% by weight of at least one additive,

[0123] the sum of the proportions of each constituent of said composition being equal to 100%,

[0124] excluding an amorphous polyamide and a microcrystalline polyamide.

[0125] In another embodiment of this second variant, the molding composition consists of:

[0126] a) 25 to 40%, in particular 25 to 39.9% of at least one long-chain aliphatic polyamide having a number of carbon atoms per nitrogen atom greater than or equal to 9, in particular greater than or equal to 10,

[0127] said at least one polyamide having an inherent viscosity in solution less than or equal to 1.3, in particular less than or equal to 1.25, as determined according to standard ISO 307: 2007 at a temperature of 20°C.

[0128] b) 60 to 70% glass fibers, and

[0129] c) 0 to 5% by weight, preferably 0.1 to 5% by weight of at least one additive,

[0130] the sum of the proportions of each constituent of said composition being equal to 100%.

[0131] In yet another embodiment of this second variant, the molding composition consists of:

[0132] a) 25 to 39.9% of at least one long-chain aliphatic polyamide having a number of carbon atoms per nitrogen atom greater than or equal to 9, in particular greater than or equal to 10,

[0133] said at least one polyamide having an inherent viscosity in solution less than or equal to 1.3, in particular less than or equal to 1.25, as determined according to standard ISO 307: 2007 at a temperature of 20°C.

[0134] b) 60 to 70% glass fibers, and

[0135] c) 0.1 to 5% by weight of at least one additive,

[0136] the sum of the proportions of each constituent of said composition being equal to 100%.

[0137] According to another aspect, the present invention relates to the use of a composition as defined above, for the manufacture of an article for the field of sanitation, transport or distribution of water, in particular drinking water, at a temperature below 60°C.

[0138] All the embodiments described above are valid for this “use” paragraph.

[0139] The expression "article for the sanitary, transport or distribution of water" designates for example all the articles used in water rooms in particular the bathroom, the kitchen, the laundry room, the toilets....This article designates a tap element, an element of pipes, supplies, evacuations and connections. This article can be a container, a conduit, a fitting, a connector, a quick connector, a screw, a valve, a valve element, a valve, a filter element and a structural part.

[0140] The transport or distribution of water in the present invention relates to water, whether potable or not, at a temperature less than or equal to 60°C.

[0141] In one embodiment, the article is selected from a container, a conduit, a fitting, a connector, a quick connector, a screw, a valve, a valve element, a valve and a filter element and a structural part.

[0142] Advantageously, the article has improved mechanical properties compared to an article whose inherent viscosity in solution is greater than 1.3, determined at 23°C according to standard ISO 527: 2012 on a type IA test piece.

[0143] Advantageously, the article has improved mechanical properties compared to an article whose inherent viscosity in solution is greater than 1.3, determined at 60°C according to standard ISO 527: 2012 on a type IA test piece.

[0144] Advantageously, the article has improved resistance to fining compared to an article whose inherent viscosity in solution is greater than 1.3, as determined according to ISO 899-1:2017 on a type IA test piece.

[0145] More advantageously, the article has improved mechanical properties compared to an article whose inherent viscosity in solution is greater than 1.3, determined at 23°C and at 60°C, according to standard ISO 527: 2012 on a type IA test piece.

[0146] Even more advantageously, the article has improved mechanical properties compared to an article whose inherent viscosity in solution is greater than 1.3, determined at 23°C and at 60°C, according to the ISO 527: 2012 standard on a type IA test piece and improved resistance to finishing compared to an article whose inherent viscosity in solution is greater than 1.3, as determined according to ISO 899-1: 2017 on a type IA test piece.

[0147] Advantageously, the article is manufactured by injection molding.

[0148] According to yet another aspect, the present invention relates to an article obtained by injection molding with a composition as defined above. EXAMPLES

[0149] Preparation of the compositions of the invention and mechanical properties:

[0150] The compositions in Table 1 were prepared by melt mixing the polyamide granules with the glass fibers and optionally the additives.

[0151] The compositions based on PAU and PA12 were implemented by compounding on a co-rotating twin-screw extruder with a diameter of 40 mm with a flat temperature profile (T°) at 250°C. The screw speed is 300 rpm and the flow rate is 100 kg / h.

[0152] The semi-crystalline aliphatic polyamide and possibly the additives are added to the main hopper.

[0153] The compositions were then molded on an injection press (Engel brand) at a set temperature of 260°C and a mold temperature of 70°C in the form of dumbbells in order to study the properties of the compositions according to the standards below.

[0154] The tensile modulus was measured at 23°C and 60°C according to ISO 527-1:2012 on type IA dumbbells.

[0155] The breaking stress was also measured at 23°C and 60°C according to the same ISO 527-1: 2012 standard. The machine used is of the INSTRON 5966 type. The crosshead speed was set at 1 mm / min for the modulus measurement and 5 mm / min for the stress measurement.

[0156] The resistance to the fining was tested on type A specimens, at 60°C under constant stress according to the ISO899-1:2017 standard.

[0157] The samples were tested either dry or after immersion in drinking water at 90°C.

[0158] The results are presented in Table 2.

[0159] [Tables 1] El E2 E3 E4 E5 E6 CEI CEZ P.Alî -w 1.07 34 RMI -w - US 34 .28 34 45 ?À11-w rs^s^nf = .141 6 34 49 PA1Z- 34 Fsbfe cæ verve CSS* 3^4.82^- 65 F&re de vs nre 295-10 65 65 65 S5 50 0.3 8.3 8.3 Û.3 03 0.3 0.3 Stesfatfi.de csJduyn 03 & 3 0.3 03 ^3. G.3 0 3 0.3 te»* læO 3.4 û 4 Q.4 Û.4 0.4 0.4

[0160] E = composition according to the invention

[0161] CE = counterexample

[0162] FoodContact™ 295-10 glass fiber (circular section with a diameter of 100 mm) is marketed by Owens Corning.

[0163] The CSG3PA820 glass fiber (with a non-circular section of 7x28 pm) is marketed by the company Nitto Boseki.

[0164] PA11 and PA12 are produced by the applicant.

[0165] Calcium stearate is marketed by the company Greven.

[0166] Licowax® E is marketed by the company Clariant.

[0167] Irganox® 1010 is marketed by BASF.

[0168] [Tables2] El E2 E3 E4 E5 £6 CEI Œ2 Tensile modulus JgggJ ~ before immersion - dry state 1-9:5 iss 18.4 13 15.7 12.S 18.3 12. S Breaking stress - before immersion - bag state - 23'C ISë ISO 173 152 182 185 163 163 Tensile modulus - before immersion - dry state 11.3 in 11 11.3 13.6 72 16.3 6.8 Breaking stress - before immersion - dry state — 145 143 135 146 148 135 115 125 Breaking stress at 6G'C - after 500b immersion in potable water at 90*C 115 111 113 IIS 103 93 Breaking stress at after 1000 hours of immersion in drinking water at 111 1OS - 113 107 102 33 5G Breaking stress at 6GSC - after 3000 hours of immersion in drinking water at 90sC 165 9$. - 156 101 101 89 F^ageè ëO^.scuslOO W» Tempr a != ruature {Dry state| > > lOOh > > ISOh > ISOh - 26h - Breaking at 60¾ in immersion, under 70 Time to break (after ICWh of immersion in potable water; > ÎOSn > l&Gh > SûSh > 10Sh > IÇÇh - 19h Breaking at SO*C, under 30 Time to break {Dry state: - - - - > - 4Sh

[0169] Composition E6 according to the invention has very significantly improved mechanical properties compared to CE2, determined at 23 and 60°C in the dry state and after immersion in drinking water at 90°C. The resistance to fining at 60°C is also significantly improved compared to a formulation composed of a polyamide matrix having an inherent viscosity >1.3

Claims

Claims

1. Use of a molding composition, comprising by weight: a) 20 to 60%, in particular 20 to 50%, in particular 25 to 39.9% of at least one long-chain aliphatic polyamide having a number of carbon atoms per nitrogen atom greater than or equal to 9, in particular greater than or equal to 10, said at least one polyamide having an inherent viscosity in solution less than or equal to 1.3, in particular less than or equal to 1.25, as determined according to ISO 307:2007 at a temperature of 20°C.b) 40 to 75% of short glass fibers with a circular cross-section and having a fiber length of 120 to 350 pm, in particular 50 to 75%, in particular 60 to 70%, and c) 0 to 5% by weight, preferably 0.1 to 5% by weight of at least one additive, the sum of the proportions of each constituent of said composition being equal to 100%, excluding an amorphous polyamide and a microcrystalline polyamide, for the manufacture of an article for the field of sanitary, transport or distribution of water, in particular drinking water, at a temperature of less than or equal to 60°C.

2. Use according to claim 1, characterized in that at least two long-chain aliphatic polyamides are present in the composition.

3. Use according to one of claims 1 or 2, characterized in that the long-chain aliphatic polyamide is obtained by polycondensation: of at least one C9 to C[8, preferably Cio to C[8, in particular Cio to C12, amino acid, or of at least one C9 to C18, preferably Cio to C18, in particular Cio to C12, lactam, or of at least one aliphatic diamine Ca and of at least one C4-C36, preferably C6-Ci8, preferably C6-Ci2, more preferably C10-Ci2, diamine Ca, with at least one C4-C36, preferably C6-Ci8, preferably C6-Ci2, more preferably C10-Ci2, dicarboxylic acid Cb, or a mixture thereof.

4. Use according to one of claims 1 or 2, characterized in that the long-chain aliphatic polyamide is obtained by polycondensation: of at least one C9 to C[8, preferably C10 to C[8, in particular C10 to C12, amino acid, or of at least one C9 to C18, preferably C10 to C18, in particular C10 to C12 lactam.

5. Use according to one of claims 1 to 4, characterized in that said long-chain polyamide is chosen from PA 1010, PA1012, PA1212, PA11 and PA 12, in particular PA11 and PA 10

6. 1Z. Use according to one of claims 1 to 5, characterized in that said long-chain polyamide is chosen from PA11 and PA 12.

7. Use according to one of claims 1 to 6, characterized in that said at least one additive is chosen from fillers, colorants, stabilizers, plasticizers, surfactants, nucleating agents, pigments, brighteners, antioxidants, lubricants, flame retardants, natural waxes, additives for laser marking, and mixtures thereof.

8. Use according to one of claims 1 to 7, characterized in that the article is chosen from a container, a conduit, a fitting, a connector, a quick connector, a screw, a valve, a valve element, a valve and a filter element and a structural part.

9. Use according to one of claims 1 to 8, characterized in that the article has improved mechanical properties compared to an article whose inherent viscosity in solution is greater than 1.3, determined at 23°C according to standard ISO 527: 2012 on a type IA test piece.

10. Use according to one of claims 1 to 9, characterized in that the article has improved mechanical properties compared to an article whose inherent viscosity in solution is greater than 1.3, determined at 60°C according to standard ISO 527: 2012 on a type IA test piece.

11. Use according to one of claims 1 to 10, characterized in that the article has improved resistance to finishing compared to an article whose inherent viscosity in solution is greater than 1.3, as determined according to ISO307:2007

12. Use according to one of claims 1 to 11, characterized in that that the item is manufactured by injection molding.