FR3000281A1 - ANTI-TERMITE CABLE SHEET COMPRISING AN X.Y ALIPHATIC POLYAMIDE WITH X + Y <18, UV ABSORBER AND / OR UV STABILIZER AND ANTIOXIDANT - Google Patents

Abstract

The present invention relates to the use of a composition comprising: a) at least one aliphatic polyamide containing at least two units corresponding to the following general formula: XY in which: XY represents a unit obtained by polycondensation of: - a diamine containing X carbon atoms and a dicarboxylic acid containing Y carbon atoms, the sum X + Y being strictly greater than 18, b) at least one UV absorber and optionally at least one UV stabilizer, c) at least one antioxidant, the ratio of weight between the antioxidant and the light stabilizer being preferably less than or equal to 0.7, for the manufacture of a mono- or multilayer cable cladding resistant to termite damage. The present invention also relates to a cable cladding consisting of a composition according to the invention, a method of manufacturing a cable cladding according to the invention and the use of a cable cladding according to the invention in a cable electric or fiber optic.

Description

Termite cable sheathing comprising an XY aliphatic polyamide with X + Y> 18, a UV absorber and / or a UV stabilizer and an antioxidant Technical field The technical field of the present invention relates to cable sheathings, in particular cable sheathings. electric and fiber optic, having, among others, excellent properties of termite resistance. The invention relates to the use of a composition comprising at least one particular aliphatic polyamide, at least one UV absorber and / or one UV stabilizer and at least one antioxidant, for producing a mono- or multilayer cable sheath resistant to termites, especially for electric and fiber optic cables. The cable according to the invention also has at least one additional property as described below. The invention particularly relates to a composition comprising at least one particular aliphatic polyamide, at least one UV absorber and / or one UV stabilizer and at least one antioxidant, having a weight ratio between the total amount of antioxidant and the total amount of antioxidant. UV protective agent less than or equal to 0.7.

The invention also relates to a mono- or multilayer cable cladding consisting of at least one layer of a composition according to the invention; a method of manufacturing a monofilament or cable cladding of the composition from said invention; and using a multilayer according to the invention to prevent and / or protect a cable, in particular an electric cable (such as a power cable, a copper cable) and / or a cable to optical fiber, termite damage and possibly damage to light, heat, wind, water, air, moisture, soil, oil, grease, jelly, other insects and / or flexion. Background Various ways of protecting a cable from termite attacks are known. Cable sheaths and floors were first impregnated with insecticides or repellents. The difficulty of loading a chemical is, however, to load in practice enough insecticide or repellent to deter termites from further attack. On the other hand, the introduction of chemicals into the soil can harm non-target organisms and the handling of chemicals is dangerous. Layered materials for cable sheathing were then selected for use as termite barrier layers, for example metals or hard plastics. In AU2011253718, it has been discovered that polyethylene terephthalate (PET) is useful as a termite barrier tape for protecting a cable from termite attacks. This material, however, is not practical for extrusion on the core of a cable due to its high melt temperature (260 ° C) and low melt viscosity, and therefore requires manufacturers to termite barriers made of thermoplastic polymer which generally use a tube extrusion process to make additional investments to implement new facilities for producing cable sheaths.

On the market, the use of PA12 or PAH-based grades for the manufacture of termite cable sheathing has been known for years. recently had to deal with production shortages. These materials are, however, very expensive and have the content of the invention. There is, therefore, now a need to find new cable-extruded cable-wrapping compositions which are environmentally friendly, which are non-toxic to the environment. human health and which lead to cable sheaths having a wide range of properties and at least anti-termite properties. In particular, a composition is contemplated which can be used to fabricate an anti-termite cable jacket which has one or more properties enabling it to cope with external conditions, particularly in the tropical and subtropical regions where the majority of termites live. For example, resistance to light and water after long-term exposure, low moisture absorption, mechanical resistance, chemical resistance, resistance to attack by other insects, resistance to flexion, etc. When cables are exposed to an external environment, including wind, sun and water (rain, moisture), such as external and overhead cables, the cable sheaths must withstand at least a significant exposure to the sunlight (ultraviolet radiation) and / or rain for long periods. Water should not penetrate under the cladding as it will damage the optical fibers and disrupt the transmitted signal or cause a short circuit of the power cable. Therefore, UV-resistant, hydrolysis resistant and / or low moisture absorbing cable sheathing is sought. When cables are buried, cable sheaths are exposed to various types of more or less acidic soils, to different types of chemicals during installation (oils, grease, jelly, etc.) and to the discharges of the surrounding fauna. such as formic acid. Cable sheaths should therefore preferably have chemical resistance. On the other hand, soils can be wet or exposed to floods. A cable jacket is therefore sought which is preferably also resistant to hydrolysis and which has a low moisture absorption. Furthermore, a cable jacket is sought which has sufficient mechanical strength and heat resistance so that it is undamaged and does not melt under normal use (indoor or outdoor use). ) electric or fiber optic cables. Cable sheathing is also preferably dimensionally stable, which means that its dimensions should not vary with time. This avoids slackening of the cladding, penetration of water into the lower layers, surface defects or wrinkles. Cable sheaths are also preferred, the outer surface of which is smooth and shiny. Indeed, without being limited to theory, any surface defect is considered a potential point of attack by termites. Therefore, a glossy surface can contribute to resistance to termite attacks.

To achieve such an appearance, the cable jacket must at least be resistant to blistering. For example, blistering may occur when the material is sensitive to moisture, especially when the material has a high moisture absorption. Surprisingly, it has now been discovered that the use of a composition comprising at least one particular aliphatic polyamide, at least one UV absorber and / or UV stabilizer and at least one provides a termite cable sheathing. , especially for electric and fiber optic cables, having one or more of the properties mentioned above, and preferably several of the properties mentioned above. SUMMARY OF THE INVENTION In order to overcome the disadvantages of the prior art, the present invention relates to a composition comprising: a) at least one aliphatic polyamide containing at least two units corresponding to the following general formula: XY wherein: 6 - XY represents a unit obtained, preferably directly, by polycondensation of: - a diamine containing X carbon atoms and - a dicarboxylic acid containing Y carbon atoms, the sum X + Y being strictly greater than 18, (hereinafter PA XY) b) at least one UV absorber and / or UV stabilizer, c) at least one antioxidant, the ratio by weight of the total amount of antioxidant (s) to the total amount of UV absorber (s) and UV stabilizer (s) (when present) being less than or equal to 0.7, and preferably less than or equal to 0.4, the weight ratio being greater than zero. The invention also relates to the use of a composition comprising: a) at least one aliphatic polyamide containing at least two units corresponding to the following general formula: XY in which: XY represents a unit obtained, preferably directly, by polycondensation of a diamine containing X carbon atoms and a dicarboxylic acid containing Y carbon atoms, the sum X + Y being strictly greater than 18, b) at least one UV absorber and / or one UV stabilizer, c) at least one antioxidant, to manufacture a mono- or multilayer cable cladding resistant to termite damage.35 - 7 - It has been observed in particular that the jacketing of mono- or multilayer cable according to the invention has good to excellent results with regard to: - resistance to termites, - resistance to thermal aging, - resistance to aging by ultraviolet (UV), - machinability (extrusion or coextrusion), - absorption of moisture, gloss and chemical resistance (to Lewis acids such as formic acid), color fastness, cold bending performance, especially when used as a diaper outer or coating layer of a cable. It has indeed been observed that after heat aging at 100 ° C. for 120 hours in a circulating air oven, the cable sheath according to the invention preferably has a retention of 80% of the elongation at break. After 1200 hours of UV exposure (luminance level of 0.5 W / m2, bandwidth of 1 nm at 340 nm, optical filter: cutoff 295 nm, black panel temperature of 63 ° C, relative humidity (HR - 50%, no water spray), the cable sheath according to the invention preferably has a retention greater than 85% or more than 90% of the elongation at break (greater than 90% for colored cable sheathing). The composition according to the invention is particularly easy to machine (easy to extrude) and leads to dimensionally stable extruded products. The cable sheath according to the invention preferably has a low moisture absorption after immersion in water or exposure to saturated humidity at 23 ° C for one week and up to two weeks (less than 2.5%) and is resistant to hydrolysis (ISO 62). It preferably has a smooth and shiny outer surface. Gloss can be measured by detecting the intensity of light reflected from an incident beam at a given angle of incidence on the surface of the test material (ASTM D 2457). Preferably, the cladding of termite cable is resistant to chemicals such as formic acid, as characterized by AS1049-2008.2 appendix M. When the composition of the invention comprises a dye or pigment, holding of the color can be characterized by AS1049-2008.2. The cable sheathing according to the invention is preferably flexible enough to resist bending, as characterized by AS1049-2008 appendix J. Indeed, it has been observed that the cable sheath of the invention has no cracks after being bent around a mandrel for 4 hours at -15 ° C. The invention also relates to a method of manufacturing a cable sheath according to the invention by extrusion or coextrusion. The invention also relates to the use of a cable sheath according to the invention or manufactured according to a method of the invention to prevent and / or protect the cable, in particular a power cable, a copper cable and fiber optic cable, termite damage and possibly / or light, heat, wind, water, air, moisture, soils, oil, fat, jelly, other insects and / or creases. Other features, aspects, subjects and advantages of the present invention will become more apparent upon reading the description and examples which follow. Specific embodiment of the invention The composition according to the invention comprises at least one PA X.Y as defined above. The diamine used for the polycondensation of PA X.Y may be chosen from linear or branched aliphatic diamines. As the linear and aliphatic diamine used for the polycondensation of PA X.Y, there may be mentioned those, saturated or unsaturated, corresponding to the formula H 2 N- (CH 2) x -NH 2, wherein X has the meaning mentioned above. Such a linear and aliphatic diamine can be chosen from hexanediamine (X = 6), heptanediamine (X = 7), octanediamine (X = 8), nonanediamine (X = 9), decanediamine (X - 10), undecanediamine (X - 11), dodecanediamine (X - 12), tridecanediamine (X = 13), tetradecanediamine (X - 14), hexadecanediamine (X 16), octadecanediamine ( X = 18), octadecenediamine (X - 18), eicosanediamine (X = 20), docosanediamine (X = 22) and diamines obtained from fatty acids. As the branched and aliphatic diamine used for the polycondensation of PA XY, there may be mentioned those selected from linear and aliphatic diamines, such as those defined above, comprising one or more alkyl groups (especially methyl or ethyl). ) hanging on the main chain of the diamine. Such a branched and aliphatic diamine may be saturated or unsaturated. By way of example, it can be chosen from 2-methyl-1,5-pentanediamine (X = 6), 2,2,4-trimethyl-1,6-hexanediamine (X = 9), 2, 4,4-trimethyl-1,6-hexanediamine (X-9), 210 methyl-1,8-octanediamine (X-9). Preferably, the branched and aliphatic diamine contains from 6 to 12 carbon atoms in its main chain. The dicarboxylic acid used for the polycondensation of PA X.Y may be selected from linear or branched aliphatic dicarboxylic acids. The linear and aliphatic dicarboxylic acid used for the polycondensation of PA X.Y may be saturated or unsaturated. By way of example, mention may be made of adipic acid (Y = 6), heptanedioic acid (Y = 7), octanedioic acid (Y-8), azelaic acid (Y = 9), and sebacic acid (Y = 10), undecanedioic acid (Y = 11), dodecanedioic acid (Y-12), brassylic acid (Y-13), tetradecanedioic acid (Y-14), pentanedecanedioic acid (Y - 15), hexadecanedioic acid (Y = 16), octadecanedioic acid (Y - 18), octadecenedioic acid (Y - 18), eicosanedioic acid (Y - 20), docosanedioic acid (Y = 22) and fatty acid dimers containing 36 carbon atoms. The fatty acid dimers mentioned above are dimerized fatty acids obtained by oligomerization or polymerization of unsaturated monobasic fatty acids bearing a long hydrocarbon chain (such as linoleic acid (Cm) and oleic acid (Cm)). ), as described in particular in EP 0 471 566. The branched and aliphatic dicarboxylic acid used for the polycondensation of PA XY may be saturated or unsaturated. The diamine and / or dicarboxylic acid used to form the polyamide used according to the invention are biobased raw materials as characterized in ASTM D6866. By way of example, mention may be made of 1,10-decanediamine, diamines and linear and aliphatic diacids as mentioned above. Advantageously, the polyamide used in the composition according to the invention does not result from a recycling of polyamides used previously. In other words, the polyamide is obtained directly by the polycondensation of: - a diamine containing X carbon atoms and - a dicarboxylic acid containing Y carbon atoms, the sum of X + Y being strictly greater than 18, of 25 preferably greater than or equal to 20, and more preferably less than or equal to 36. The diamine and the dicarboxylic acid used to form the polyamide used in the composition according to the invention are chosen so as to satisfy the condition that the the sum of X + Y is strictly greater than 18, preferably greater than or equal to 20, and more preferably less than or equal to 36. Preferably, X is selected from 6 to 12 and / or is selected from 10 to 18 Preferably, the polyamide used in the composition of the invention is a homopolymer.

Preferably, the polyamide used in the composition of the invention may be chosen from PA 6.14, PA 6.18, PA 10.10, PA 10.12, PA 10.14, PA 12.12 and mixtures thereof, in particular from PA 10.10, PA 10.12, PA 12.12 and their mixtures. mixtures, and the polyamide is more preferably PA 10.10, PA 10.12 or PA 12.12. Advantageously, the polyamide used according to the invention has a melting point below 210 ° C., preferably from 180 ° C. to 205 ° C. Preferably, the molar proportions of diamine and dicarboxylic acid used to form the polyamide used according to the invention are stoichiometric. The polyamide used according to the invention has a flexibility of less than or equal to 2000 MPa, preferably ranging from 1000 to 1800 MPa (measured according to AS1049.2-2008, Appendix J). Preferably, the polyamide is used in the composition of the invention in an amount such that the balance to achieve 100% of the composition is said polyamide, said amount being at least 50% by weight, so that more preferably at least 60% by weight of the total weight of the composition. The composition according to the invention comprises at least one UV absorber and optionally at least one UV stabilizer. The UV absorber used according to the invention provides UV protection by absorption or efficient reflection of incident UV radiation. The UV stabilizer used according to the invention functions as a sensor for harmful molecules that can attack and degrade the plastic material used in the composition of the invention. According to a first embodiment of the invention, the UV absorber is selected from black UV absorbers (hereinafter referred to as L1). The term black UV absorber comprises UV absorbers having a black color or capable of coloring the composition of the invention in black when present in an effective amount (e.g. in an amount of less than or equal to 0.1). % in weight). These. Black UV absorbers absorb any incident light radiation of any wavelength (including UV radiation), thus leading to a black color component. Preferably, the black-colored UV absorber (L1) which is used in the composition according to the invention may be selected from mineral black UV absorbers such as black pigments such as carbon black, black and white. iron oxide, manganese black (MnO 2), cobalt black (Co 2 O 3), antimony black and mixtures thereof. More preferably, the carbon black is used. The carbon black may be available under the trademark Vulcan® P sold by Cabot Corporation. Advantageously, the average particle size of the mineral black UV absorber is less than 25 nm. The average particle size can be determined according to ASTM D3849. Advantageously, the mineral black UV absorber can be homogeneously dispersed in the polyamide matrix of the composition, according to ISO 18553. Preferably, the mineral black UV absorber 10 is present in the composition in one embodiment. amount of at least 2% by weight relative to the total weight of the composition, and preferably from 2 to 3% by weight relative to the total weight of the composition. Its content can be determined according to AS / NZS 1660.2.4: 1998. According to this first embodiment, the composition comprises as antioxidant at least one metal antioxidant. The composition may also comprise at least one thermal stabilizer. Advantageously, the metal antioxidant acts as a thermal stabilizer. This makes it possible to obtain a cable jacket having a better resistance to thermal aging. As examples of metal antioxidants and / or thermal stabilizers which can be used according to the invention, mention may be made of inorganic copper antioxidants and thermal stabilizers, and more preferably salts and copper such as potassium- and copper-halogen (KI / CuI) alloys with a stearate-based lubricant or a wax binder. Such metal antioxidants and heat stabilizers may be available under the trademark BRUGGOLENO H3336 sold by BROGGEMANN CHEMICAL, or POLYADO PH 201 IODIDE STAB sold by POLYAD SERVICES. The total amount of the metal antioxidant (s) and heat stabilizer that may be present in the composition of the invention is preferably from 0.1% by weight to 2% by weight relative to the total weight of the composition. When the metal antioxidant acts as a thermal stabilizer, and vice versa, the total amount of the metal antioxidant (s) and thermal stabilizer (s) that may be present in the composition is preferably 0.05% by weight. at 1% by weight relative to the total weight of the composition. According to a second embodiment of the invention, the UV absorber is chosen from organic and / or inorganic UV absorbers (L2). These UV absorbers are different from those of the first embodiment. The UV absorber used according to the second embodiment is in particular not black in color. As an example of organic or inorganic UV absorbers (L2) which may be used in the composition of the invention, mention may be made of benzophenone UV absorbers; benzotriazole UV absorbers such as 2- (2H-benzotriazol-2-yl) -4,6-bis (1-methyl-1-phenylethyl) phenol (TinuvinO 234), N (2-ethoxyphenyl) -N'- (2-ethylphenyl) -ethanediamide (TINUVINO 312) and 2- (2'-hydroxy-3 ', 5'-di-tert-butylphenyl) benzotriazole (TINUVINO 320); and TiO 2 optionally coated with rutile. More preferably, it may be selected from benzotriazole UV absorbers. The UV absorber (L2) may be present in the composition according to the invention in an amount ranging from 0.1 to 1.5% by weight and preferably from 0.2 to 0.5% by weight relative to total weight of the composition. According to this second embodiment, the composition 10 according to the invention does not comprise a component which can give a black color to the composition. The composition does not include in particular black dye and black pigment such as the black UV absorber mentioned previously (L1). The composition according to the invention may comprise at least one dye or pigment, different from a black dye or a black pigment. Said dye and said pigment make it possible to color the composition in the desired color. By way of example, said dye or pigment may be chosen from dyes or pigments giving a blue, green, yellow, red or white color to the composition or to the cable sheathing according to the invention, under visible light. Preferably, the composition according to the invention does not comprise salts or metal complexes such as salts or complexes of copper and potassium halogen. These salts and metal complexes can indeed create interference and darken the color given by the non-black dye or pigment. When present (i.e., when the composition comprises more than 0% by weight based on the total weight of the composition), the dye or pigment is preferably selected in an amount effective to color - - visibly the composition, for example ranging from 1 to 10% by weight relative to the total weight of the composition. The amount of dye or pigment may, for example, vary up to 4% by weight, up to 6% by weight or up to 8% by weight, based on the total weight of the composition. According to this second embodiment, the composition according to the invention is preferably a halogen-free composition. The composition according to the invention may comprise at least one UV stabilizer, preferably chosen from hindered amine light stabilizers (HALS). In the composition according to the first embodiment, a UV stabilizer may not be used. When present in the composition of the invention, the HALS may be selected from amine derivatives of 2,2,6,6-tetramethylpiperidine; aminoether derivatives of 2,2,6,6-tetramethylpiperidine (hereinafter respectively amine HALS and aminoether HALS); and their mixtures. 2,2,6,6-tetramethyl-4-piperidone may be mentioned; 2,2,6,6-tetramethyl-4-piperidinol; bis- (1,2,2,6,6-pentamethylpiperidyl) - (3 ', 5'-ditert-butyl-4'-hydroxybenzyl) butyl malonate; di- (2,2,6,6-tetramethyl-4-piperidyl) sebacate (TINUVIN® 770); N- (2-hydroxyethyl) -2,2,6,6-tetramethyl-4-piperidinol oligomer and succinic acid (TINUVINO 622); cyanuric acid and N, N-di (2,2,6,6-tetramethyl-4-piperidyl) hexamethylenediamine oligomer; bis- (2,2,6,6-tetramethyl-4-piperidinyl) succinate; bis- (1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl) sebacate (TINUVINO 123); bis- (1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate (TINUVINO 765); tetrakis (2,2,6,6-tetramethyl-4-piperidyl) -1,2,3,4-butane tetracarboxylate; N, N'-bis- (2,2,6,6-tetramethyl-4-piperidyl) hexane-1,6-diamine (CHIMASORBO T5); N-butyl-2,2,6,6-tetramethyl-4-piperidine amine; 2,2'-[(2,2,6,6-tetramethyl-piperidinyl) -imino] -bis [ethanol]; poly (6-morpholine-5-triazine-2,4-diyl) (2,2,6,6-tetramethyl-4-piperidinyl) iminohexamethylene (2,2,6,6-tetramethyl-4-piperidinyl) imino ) (Cyasorb UV 3346); 5- (2,2,6,6-tetramethyl-4-piperidinyl) -2-cyclo-undecyl-oxazole) (HOSTAVIN® N20); 1,1 '- (1,2-ethanediyl) -bis- (3,3', 5,5'-tetramethylpiperazinone); 8-acetyl-3-dothecyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro (4,5) decane-2,4-dione; polymethylpropyl-3-oxy- [4 (2,2,6,6-tetramethyl) piperidinyl] siloxane (UVASILCI 299); 1,2,3,4-butane-tetracarboxylic acid 1,2,3-tris (1,2,2,6,6-pentamethyl-4-piperidinyl) -4-tridecyl ester; alpha-methylstyrene-N- (2,2,6,6-tetramethyl-4-piperidinyl) maleimide and stearylmaleimide copolymer; 1,2,3,4-butanetetracarboxylic acid, polymer with beta, beta, beta ', beta'-tetramethyl-2,4,8,10-tetraoxaspiro [5,5] undecane-3,9-ester -diethano1,1,2,2,6,6-pentamethyl-4-piperidinyl (MARK® LA63); the polymer of 2,4,8,10-tetraoxaspiro [5,5] undecane-3,9-diethanol-beta, beta, beta ', beta-tetramethyl with 2,2,6,6-tetramethyl ester 4-piperidinyl 1,2,3,4-butanetetracarboxylic acid (MARK @ LA68); D-glucitol, 1,3,2,4-bis-O- (2,2,6,6-tetramethyl-4-piperidinylidene) - (HALS 7); 7-oxa- 3,20-diazadispiro [5,1,11,2] henicosan-21-one-2,2,4,4-tetramethyl-20- (oxiranylmethyl) oligomer (HOSTAVINC1 N30); propanedioic acid, [(4-methoxyphenyl) methylene] -bis- (1,2,2,6,6-pentamethyl-4-piperidinyl) ester (SANDUVORO PR 31); formamide, N, N'-1,6-hexanediylbis- [N- (2,2,6,6-tetramethyl) -4-piperidinyl (UVINULO 4050H); 1,3,5-triazine-2,4,6; triamine, N, N '- [1,2-ethanediylbis [[[4,6-bis [butyl (1,2,2,6,6-pentamethyl-4-piperidinyl) amino] - 1,3,5 triazin-2-yl] imino] -3,1-propanediyl] Hbis [N ', N "-dibutyl-N', N" -bis (1, 2,2,6,6-pentamethyl-4-piperidinyl) (CHIMASSORBC) 119), poly [[6 - [(1,1,3,3-tetramethylbutyl) amino] -1,3,5-triazine-2,4-diyl] [(2,2,6,6-tetramethyl) 4-piperidin-1-imino] -1,6-hexanediyl [(2,2,6,6-tetramethyl-4-piperidinyl) imino]] (CHIMASSORBO 944); 1,6-hexanediamine, N, N-bis; (2,2,6,6-tetramethyl-4-piperidinyl) - polymer with 2,4,6-trichloro-1,3,5-triazine, reaction products with N-butyl-1-butanamine and N-butyl-2,2,6,6-tetramethyl-4-piperidinamine (CHIMASSORB® 2020); 1,5-dioxaspiro (5,5) undecane-3,3-dicarboxylic acid, bis ester (2, 2,6,6-tetramethyl-4-peridinyl) (CYASORM UV-500), 1,5-dioxaspiro (5,5) undecane-3,3-dicarboxylic acid, is bis (1,2,2,6,6-pentamethyl-4-peridinyl) (CYASORM UV-516); N-2,2,6,6-tetramethyl-4-piperidinyl-N-aminooxamide; 4-acryloyloxy-1,2,2,6,6-pentamethyl-4-piperidine; 1,5,8,12-tetrakis [2 ', 4'-bis (1 ", 2", 2 ", 6", 6 "-pentamethyl-4" -piperidinyl (butyl) amino) -1', 3 ', 5'-triazine-6'-yl] 1,5,8,12-tetraazadodecane; HALS PB-41 (CLARIANT 0 S.A.); N, N'-bis (2,2,6,6-tetramethyl-4-piperidinyl) -1,3-benzenedicarboxamide (NYLOSTAM SEED); 3-dodecyl-1- (2,2,6,6-tetramethyl-4-piperidyl) pyrrolidine-2,5-dione; 1,3-propanediamine, N, N "-1,2-ethanediylbis-, polymer with 2,4,6-trichloro-1,3,5-triazine, reaction products with N-butyl-2,2, 6,6-tetramethyl-4-piperidinamine (UVASORM HA88) 1,1 '- (1,2-ethanediyl) -bis- (3,3'15,5'-tetra-methylpiperazinone) (GOOD-RITE0) 303); 1,1 ', 1 "- (1,3,5-triazine-2,4,6-triyltris ((cyclohexylimino) -2,1-ethanediyl) tris- (3,3,5 5-tetramethylpiperazinone) (GOOD-RITEO 3150) and 1,11,1 "- (1,3,5-triazine-2,4,6-triyltris ((cyclohexylimino) -2,1-ethanediyl) tris- (3,314,5,5-tetramethylpiperazinone) (GOOD-RITEC) 3159) 1,3,5-triazine-2,4,6-triamine, N2, N2'-1,2-ethanediylbis [N2- [3- [[4,6-bis [butyl (1,2,2,6,6-pentamethyl-4-piperidinyl) amino] -1,3,5-triazin-2-yl] amino] propyl] -N4, N6- dibutyl-N4, N6-bis (1,2,2,6,6-pentamethyl-4-piperidinyl) (SONGLIGHTC) 1190. Preferably, HALS which can be used in the composition of the invention is selected HALS amines and mixtures thereof, by way of example, it is possible to ionize poly [[6 - [(1,1,3,3-tetramethylbutyl) amino] -1,3,5-triazine-2,4-diyl] [(2,2,6,6-tetramethyl) -4- piperidinyl) imino] -1,6-hexanediyl [(2,2,6,6-tetramethyl-4-piperidinyl) imino]] (CHIMASSORBC) 944); 1,3,5-triazine-2,4,6-triamine, N, N "- [1,2-ethanediylbis [[[4,6-bis [butyl] (1,2,2,6,6- pentamethyl-4-piperidinyl) amino] -1,3,5-triazin-2-ylimino] -3,1-propanediyl-bis [N ', N "-dibutyl-N', N" -bis (1,2, 2,6,6-pentamethyl-4-piperidinyl) (CHIMASSORBC) 119) 1,6-hexanediamine, a polymer of N, N'-bis (2,2,6,6-tetramethyl-4-piperidinyl) with 2,4,6-trichloro-1,3,5-triazine, reaction products with N-butyl-1-butanamine and N-butyl-1,2,6,6-tetramethyl-4-piperidinamine (CHIMASSORBC) 2020), N, N'-bis (2,2,6,6-tetramethyl-4-piperidinyl) -1,3-benzenedicarboxamide (NYLOSTABC, SEED). More preferably, the HALS amine used in composition of the invention is poly [[6- [(1,1,3,3-tetramethylbutyl) amino] -1,3,5-triazine-2,4-diyl] [(2,2,6, 6-tetramethyl-4-piperidinyl) imino] -1,6-hexanediyl [(2,2,6,6-tetramethyl-4-piperidinyl) imino]]) (CHIMASSORM '944). it is present in the composition according to the invention, the UV stabilizer is present in an amount ranging from 0.1 to 1% by weight and preferably from 0.2 to 0.5% by weight relative to the total weight of the composition. The composition according to the invention comprises at least one antioxidant and preferably at least two or at least three antioxidants. According to the first embodiment of the invention, the composition comprises at least two antioxidants, at least one being organic (A1) and advantageously at least one metal being (MA1), as defined above. The organic antioxidant (A1) is different from said one or more metal antioxidants (MA1) and is preferably selected from organic antioxidants. As the organic antioxidant (Al) which may be used in the composition according to the invention, there may be mentioned hindered phenolic antioxidants; aromatic secondary amines; and their mixtures. A preferred organic antioxidant (A1) is selected from hindered phenolic antioxidants. As an example of hindered phenolic antioxidant, N, N'-hexane-1,6-diylbis (3- (3,5-di-tert-butyl-4-hydroxyphenylpropionamide)) can be mentioned ( IRGANOM 1098); ethylenebis (oxyethylene) bis [(3-tert-butyl-4-hydroxy-5-methylphenyl) propionate) (IRGANOM 245); pentaerythritol tetrakis (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate) (IRGANOM-22-1010); 6,6'-di-tert-butyl-4,4'-butylidenedi-m-cresol (LOWINOXO 44E25); 3,9-bis [1,1-dimethyl-2- [13- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy] ethyl] 2,4,8,10-tetraoxaspiro [5.5] -undecane (ADK STABO AO 80). As an example of aromatic secondary amines which may be used in the composition of the invention, there may be mentioned 4,4'-bis (alpha, alpha-dimethylbenzyl) diphenylamine (NAUGARDO 445); 4 - {[4,6-bis (octylsulfanyl) -1,3,5-triazin-2-yl] aminol-2,6-di-tert-butylphenol (IRGANOXO 565); 1-N, 4-N-di (phenyl) benzene-1,4-diamine (FLEXAMINE® G); benzenamine, N-phenyl-, reaction products with 2,4,4-trimethylpentene (IRGANOXO 5057).

According to the second embodiment of the invention, the composition comprises at least one organic antioxidant (Al).

Said organic antioxidant (A1) may be chosen from those defined above. A preferred organic antioxidant (A1) is selected from hindered phenolic antioxidants.

The composition according to the invention may comprise at least one antioxidant (A2) as secondary antioxidant, said antioxidant (A2) being different from the antioxidant (A1) and preferably being chosen from organic antioxidants. The organic antioxidant (A2) may be chosen from organophosphites, organophosphonites and / or thio antioxidants. A preferred organic antioxidant (A2) is selected from organophosphites and organophosphonites. As the organophosphite or organophosphinite which can be used in the composition of the invention, mention may be made of 4,4'-biphenylenediphosphonous acid tetrakis (2,4-di-tert-butylphenyl) ester (HOSTANOXO P-EPQ), phosphoric acid triphenyl ester (IRGAFOSO TPP), tris (4-nonylphenyloxy) phosphine (IRGAFOSO TNPP), tris (2,4-ditert-butylphenyl) phosphite (IRGAFOSO 168 ), tetrakis (2,4-di-tert-butylphenyl) [1,1-biphenyl] -4,4-glybisphosphate (IRGAFOSO P-EPQ), diphenylisodecyl phosphite (IRGAFOSO DDPP), bis (2-diphosphite) , 4-tert-butylphenyl) pentaerythritol (IRGAFOSO 126), bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite (ADK STABO PEP-36), diphosphite bis (2,4-diisopropyl) dicumylphenyl) pentaerythritol (DOVERPHOSO S-9228 sold by DOVER), the phosphite of 2,2 ', 2 "-nitrilo [triethyl-tris [3,3', 5,5'-tetra-tert-butyl] -1,1 ' 2-biphenyl-2,2'-diyl]] (IRGAFOSO 12), the phosphite of 2,2'-methylenebis (4,6-di -tert-butylphenyl) octyl (ADK STABO HP 10), phenol, 2- (1,1-dimethylethyl) -6-methyl-4- [3 - [[2,4,8,10-tetrakis (1,1 dimethylethyl) dibenzo [d, f] [1,3,2] dioxaphosphepin-6-yl] oxy] propyl] - (SUMILIZERO GP sold by SUMIMOTO), bis [3,5-di (tert-butyl) -4- calcium hydroxybenzyl (ethoxy) phosphinate] (IRGANOM 1425).

As thiooxidants which may be used in the composition of the invention, there may be mentioned propanoic acid, 3- (dodecylthio) -1,1 '- [2,2-bis [[3- (dodecylthio) 1-oxopropoxy] methyl] -1,3-propanediyl] (ADK STABO AO 412S), propanoic acid, 3,3'-thiobis, 1,1'-didodecyl ester (IRGANOM PS 800), propanoic acid, 3,3'-thiobis-, 1,1'-dioctadecyl ester (HOSTANOXO SE 4), distearyl disulfide (HOSTANOXO SE 10), ADK STAW A0-23 (CAS number 66534-05-2, 71982- 66-6), 2-methyl-4,6-bis (octylsulfanylmethyl) phenol (IRGANOM 1520), phenol, 2,4-bis [(dodecylthio) methyl] -6-methyl (IRGANOM 1726), 1,1 '- (thiodi-2,1-ethanediyl) ester (IRGANOM 1035), 4,4'-thiobis [2- (1,1-dimethylethyl) -5-methyl-phenol (IRGANOM 415), 2,2'-thiobis [6- (1,1-dimethylethyl) -4-methylphenol (IRGANOXO 1081), 2-methyl-4,6-bis [(octylthio) methyl] phenol (IRGANOM 1520) . Preferably, the composition according to the invention comprises a mixture of an antioxidant (Al) and an antioxidant (A2), and more preferably a mixture of one or more hindered phenolic antioxidants and a or more organophosphites and / or one or more organophosphinites.

The organic antioxidant (Al) that may be used in the composition of the invention may be present in an amount ranging from 0.05 to 0.4% by weight relative to the total weight of the composition.

Preferably, in the composition according to the first embodiment of the invention, the organic antioxidant (A1) is present in an amount ranging from 0.1 to 0.3% by weight, relative to the total weight of the composition. . Preferably, when it is present, the antioxidant (A2) is present in the composition according to the invention in an amount ranging from 0.1 to 1% by weight and preferably from 0.3 to 0.5% by weight. weight, relative to the total weight of the composition.

Preferably, in the composition according to the second embodiment of the invention, the antioxidant (A1) is present in an amount ranging from 0.1 to 0.2% by weight, relative to the total weight of the composition. Preferably, when present, the antioxidant (A2) is present in the composition according to the invention in an amount ranging from 0.05 to 0.4% by weight, relative to the total weight of the composition, and preferably from 0.1 to 0.5% by weight, relative to the total weight of the composition. Preferably, the amounts by weight of the antioxidant (s) (MA1, Al, A2), the UV absorber (s) and the UV stabilizer (s) are chosen independently of each other within the previously defined quantity ranges, provided that the ratio by weight between the total amount of the antioxidant (s) and the total amount of the UV absorber (s) and the UV stabilizer (s) is less than or equal to 0.7, and more preferably less than or equal to 0.4, said ratio by weight being different from zero. The composition according to the invention does not advantageously produce smoke during the (co) extrusion process. The composition according to the invention may comprise at least one additive chosen from plasticizers and impact resistance modifiers. As examples of plasticizers, mention may be made of benzene sulfonamide derivatives, such as N-butyl benzene sulfonamide (BBSA), ethyl toluene sulfonamide or N-cyclohexyl toluene sulfonamide; esters of hydroxybenzoic acids, such as 2-ethylhexyl para-hydroxybenzoate and 2-decylhexyl parahydroxybenzoate; esters or ethers of tetrahydrofurfuryl alcohol, such as oligoethyleneoxytetrahydrofurfuryl alcohol; and esters of citric acid or hydroxymalonic acid, such as oligoethyleneoxy malonate. There may also be mentioned decyl hexyl para-hydroxybenzoate and ethylhexyl para-hydroxybenzoate. A particularly preferred plasticizer is N-butylbenzene sulfonamide (BBSA). As examples of impact resistance modifiers, mention may be made of polyolefins, crosslinked polyolefins, ethylene-propylene rubber elastomer (EPR), ethylenepropylene-diene monomer elastomer (EPDM), styrene-butadiene-styrene (SBS) and styrene-ethylene-butadiene-styrene (SEBS) elastomers, which elastomers can be grafted to facilitate their compatibilization with polyamides, copolymers containing polyamide blocks and polyether blocks. These copolymers containing polyamide blocks and polyether blocks are known per se, they are also known under the name PESA (polyether-block-amide). It is also possible to mention acrylic elastomers, for example those of the nitrile-butadiene rubber (NBR) type, of the hydrogenated nitrile-butadiene rubber (HNBR) type and of the carboxylated nitrile-butadiene rubber (X-NBR) type. The additive may be present in the composition according to the invention in an amount of up to 35% by weight and more preferably up to 15% by weight relative to the total weight of the composition. The nature and amount of the additives that may be present in the composition must be chosen so as not to degrade the advantageous properties of the composition of the invention. According to a first particularly preferred embodiment of the invention, the composition is constituted by: a ') at least one PA XY, 35 b') at least one black UV absorber which is preferably carbon black, C ') at least one organic antioxidant (Al), preferably selected from sterically hindered benzophenols, d) optionally at least one UV stabilizer, e') optionally at least one other organic antioxidant (A2), preferably chosen from organophosphites and organophosphinites, f ') optionally at least one metal antioxidant or a thermal stabilizer (MA2), preferably chosen from antioxidants or copper-based thermal stabilizers, g') optionally at least one plasticizer , h ') optionally at least one modifier of the impact resistance, the ratio by weight between the total amount of the antioxidant (s) and the total amount of the UV absorber (s) and the UV stabilizers are preferably less than or equal to 0.7, more preferably less than or equal to 0.4, and being different from zero.

Ingredients a ') to h') are as defined above. The composition of the invention is in particular constituted by: a ') the complement to reach 100% of at least one PA XY, b') of 2 to 3% by weight of carbon black, c ') of 0, 0.5 to 0.4% by weight, preferably 0.1 to 0.3% by weight, of at least one organic antioxidant (A1), 0.1 to 1% by weight, preferably from 0.3 to 0.5% by weight, of at least one other organic antioxidant (A2), 35 e ') from 0.05 to 1% by weight of at least one metal antioxidant or thermal stabilizer (MA2) F ') from 0 to 35% by weight of at least one additive chosen from plasticizers and impact resistance modifiers, preferably from 0 to 15% of a plasticizer, the ratio by weight of the total amount of antioxidant and the total amount of the photostabilizer is preferably less than or equal to 0.7, and more preferably 0.4, zero being excluded.

According to another second particularly preferred embodiment of the invention, the composition is constituted by: a ") at least one PA XY, b") at least one UV absorber, preferably chosen from benzotriazole UV absorbers, c ") at least one UV stabilizer chosen from HALS, preferably amines HALS, d ") at least one organic antioxidant (Al), preferably selected from sterically hindered benzophenol, e") optionally at least one organic antioxidant (A2) , preferably chosen from organophosphites and organophosphinites, f ") optionally at least one pigment or dye which is different from a black dye or a black pigment, g") optionally at least one plasticizer, h ") optionally less a modifier of the impact resistance, the ratio by weight between the total amount of antioxidant and the total amount of photostabilizer preferably being less than or equal to 0.7, more preferably ESR less than or 35 equal to 0.4, zero being excluded. Ingredients (a) to (a) are as previously defined: Ingredients (a) to (e) and (g) to (h) should be chosen so as not to affect the color given to the composition. by the ingredient f ") if it is present. The composition of the invention may especially consist of: a ") the complement to reach 100% of at least one PA XY, b") from 0 to 1% by weight, preferably from 0.1 to 1% by weight, more preferably from 0.2 to 0.5% by weight, of at least one UV absorber, c ") from 0.1 to 1.5% by weight, preferably from 0.2 to 0.5% by weight, of at least one UV stabilizer Li selected from HALS, d ") from 0.05 to 0.4% by weight, preferably from 0.1 to 0.2% by weight, at least one organic antioxidant (A1), e ") of 0.05 to 0.4% by weight, preferably 0.1 to 0.5% by weight, of at least one other antioxidant (A2) (F) 0 to 4% by weight or 0 to 6% by weight or 0 to 8% by weight of at least one pigment or colorant which is different from a black dye or a black pigment the amount of said pigment or dye being preferably greater than zero, 30 g ") from 0 to 35% by weight of at least one additive selected from plasticizers and modifiers Preferably, the weight ratio of the total amount of antioxidants to the total amount of the UV absorber (s) and the UV stabilizer (s) is -30 to 50% by weight. preferably less than or equal to 0.7, preferably less than or equal to 0.4, zero being excluded. Advantageously, the composition according to the invention does not contain a polyhydric alcohol or a polyhydroxy polymer having in particular a number average molecular weight (Mn) of less than 2,000 as determined for the polymer materials by gel permeation chromatography (GPC). . As an example of polyhydric alcohol or polyhydroxy polymer, there may be mentioned polyols such as pentaerythritol, dipentaerythritol, tripentaerythritol, ditrimethylolpropane and saccharides. The terms polyhydric alcohol and polyhydroxy polymer used in the present application do not cover hindered phenolic antioxidants. When the composition according to the invention does not contain such polyhydric alcohols or polyhydroxy polymers, it leads to a cable sheath which surprisingly has a lower moisture absorption and / or better water resistance. The invention also relates to a cable casing 25 comprising at least one layer constituted by any one of the compositions according to the invention. Advantageously, the cable jacket of the invention comprises as an outer layer a layer 30 consisting of a composition according to the invention. When the cable jacket is a monolayer structure, the term outer layer means the monolayer cladding and the outer surface of said cladding is in contact with the external environment (soil, air, sunlight, water, termites and the like). insects, chemicals such as oils, fats, jelly, etc.). When the cable jacket is a multilayer structure, the outer layer means the layer whose outer surface is in contact with the external environment. The other constituent layer of the multilayer cable cladding of the invention may be selected from the conventionally used layers. The cable sheath according to the invention may in particular form a composite layer with a polyolefin layer, such as a polyethylene layer, positioned under a monolayer cable sheath according to the invention (monolayer rich in PA XY, c. ie 50% by weight of PA XY relative to the total weight of the composition of the layer). The resulting composite layer is part of the invention and can be manufactured by conventional coextrusion methods. The multilayer cable cladding according to the invention may for example comprise from inside to outside: at least one insulating layer, consisting of one or more identical or different dielectric materials on the conducting wire; at least one intermediate layer selected from a thermoplastic polymer-based layer and a polyolefin-based layer, such as a polyethylene-based layer, at least one outer layer consisting of monolayer cladding or a composite layer according to the invention.

The term inner layer refers to the layer whose inner surface is in contact with the conductive wire, including the electric wire or the optical fiber.

The invention also relates to a method of manufacturing a mono- or multilayer cable cladding according to the invention, as defined above. Conventional extrusion and coextrusion techniques can be realized. A mono- or multilayer cable cladding according to the invention may for example be manufactured by performing at least the following steps: i) the melt blending of the various ingredients of the composition (s) of the (or each) 20 layer, and ii) extruding (or coextruding) the mixture (s), preferably at a temperature of the extruder barrel in the range of 180 ° C to 280 ° C.

Preferably, the process according to the invention comprises only a melt mixing step or an extrusion (or coextrusion) step: the polymer is directly extruded without pelletizing prior to extrusion (or coextrusion) of cable sheathing. As an example of the extruder that can be used, there is the JSW model: TEX3OXSST45.5BW-5V available from RC Group.

The composition according to the invention can be extruded into mono- or multilayer films or tubes. The thickness of the monolayer cable sheathing according to the invention can be chosen such as those traditionally used for cable sheathings, in particular the cladding of electrical or fiber optic cables. The present invention also relates to the use of a cable sheath according to the invention or manufactured according to the method of the invention to prevent and / or protect a cable, in particular a power cable, a copper cable and a cable. fiber optic cable, termite damage and possibly light, heat, wind, water, moisture, soil, oil, fat, jelly, other insects and / or folds. It has indeed been observed that the cable sheath according to the invention is sufficiently resistant to damage by the Australian subterranean termite "Mastotermes darwiniensis", which is known as one of the most destructive termite species in the world. Therefore, the cable sheath according to the invention or manufactured according to the method of the invention may advantageously be used as an outer layer or coating layer of a cable, such as an electric cable or a fiber cable. optical, to protect the entire cable.

Materials TINUVINe, CHIMASSORBC1, IRGANOM and IRGAFOSO are available from BASF; CYASORM materials are available from CYTEC TECHNOLOGY CORP; UVASIL® materials are available from GREAT LAKES CHEMICAL CORP; Materials SADUVORC), HOSTAVINC), NYLOSTABO and HOSTANOM are available from CLARIANT; UVINULC materials are available from BASE; UVASORBC materials) are available from PARTECIPAZIONI INDUSTRIALI; GOOD-RITE0 materials are available from B.

F. GOODRICH CO; MARK @ materials are available from ASAHI DENKA CO; SONGLIGHT materials are available from SONGWON; LOWINOM, NAUGARDO and FLEXAMINE0 materials are available from CHEMTURA; ADK STAM materials are available from PALMAROLE. Other objects and advantages of the present invention will become apparent from the following examples, which are given as a guide and without limitation. EXAMPLES The following compositions are prepared by melt blending the various ingredients and then extruded into films or tubes depending on the purpose of the test. Extrusion is performed at a screw speed of 40 rpm at a cylinder temperature ranging from 180 ° C to 245 ° C in the extruder. A suitable die is used to obtain a film or tube. The amounts in the table below are given in percentage by weight relative to the total weight of the composition. Composition according to I III III the invention PA 10.10 q.s. - - - 100 PA 10.12 - q.s. - q.s.

100 100 PA 12.12 - - q.s. - 100 Carbon black - - - 2 Master color mix - - 6 - green Master mix blue color 3 5 _ _ ADK Stab PEP-36 0,2 0,1 0,3 - Lowinox 44B25 0,2 0,1 0.4 - Tinuvin 234 0.4 0.2 0.5 - Chimassorb 944LB 0.6- 0.5 1.5 - Irganox 1098 - - - 0.3 Irgafos 168 - - - 0.2 Bruggolen H3336 - - - 0.3 Ratio by weight 0.4 0.3 0.35 0.4 (antioxidants) / (UV absorbers + UV stabilizers) qs 100: quantity sufficient to reach 100% with respect to the total weight of the composition Comparative compositions V, VI, VII corresponding to compositions I, II, III in which PA XY are replaced by PA 6.6, PA 6.10, PA 6.12 ( which correspond to XY PAs in which the sum of X + Y is equal or less prepared and extruded into 18) films are also or using JSW template: to prepare the film compositions and the tubes from the same process.

5 TEX3OXSST-45.5BW-5V The extruder is used above (co-rotation, type of screw: segment, screw LSP-2, screw diameter: 32 mm, screw speed 59,5595 rpm, L / D ratio 45.5 (base diameter 30 mm)). The samples according to the invention and the comparative samples are submitted to two groups of tests: First group of tests: properties required by AS1049-2008 for an anti-termite cable sheath Termite resistance: The compositions are extruded into tubes which are cut to a length of 100 mm and evaluated in a bioassay. The sample tubes are exposed to a species of Australian subterranean termite. The ends of each sample tube are covered with brass cap nuts. An individual piece of wood is placed next to each test piece tested to provide a termite power source and encourage them to contact and explore the surface of the plastic samples. The duration of the bioassay is 12 weeks.

Thermal Resistance: The compositions are extruded into a 150 μm thick film. Type IV dumbbells according to ASTM are punched in the direction of flow in this extruded film. The test is carried out according to AS1049.2-2008 (heat aging at 100 ° C. for 120 hours in an air circulation oven, retention of 80% of the elongation at break required according to the standard AS1049). UV resistance: The compositions are extruded into a 150 μm thick film. Type IV dumbbells according to ASTM are punched in the direction of flow in this extruded film. The test is carried out according to AS1049.2-2008 (1200 hours of UV exposure (luminance level 0.5 W / m2, bandwidth of 1 nm at 340 nm, optical filter: cutoff 295 nm, panel temperature). black 63 ° C, relative humidity (RH) = 50%, no water spray)). - 38 - Results: The results are as follows: V VI VII I Il III Termite resistance Failure Failure Failure (+) Success (++) Success (++) Thermal resistance (retention at break> 80% required) Limit Limit Limit Success (+) Success (++) Success (++) UV Resistance Failure Failure 85-90% 87-92% 89-92T% (retention at (<85%) (<85%) (<85%) 85%) rupture> 85% required) Termite resistance: It is observed that the sample tubes constituted by the compositions I, II, III according to the invention comprising a PA XY with X + Y> 18 exhibit superior resistance. to termite attack. The sample tubes consisting of compositions II, III comprising a PA X.Y with X + Y> 20 have in particular the best results. No signs of nibbling or attack are observed, whereas the comparative compositions V, VI, VII comprising a PA X.Y with X + Y less than or equal to 18 show obvious signs of attack. Thermal Resistance: Despite their high melting point, compositions V, VI, VIII comprising an XY PA with X + Y of 18 or less lead to extruded samples having lower heat aging resistance than compositions I, II III according to the invention comprising a PA XY with X + Y> 18 with time. The samples from compositions II, III comprising a PA X.Y with X + Y> 20 have in particular the best results.

UV Resistance: The plastic sheath must remain highly flexible and non-degraded after long external exposures during cable installation. Therefore, AS1049 requires 85% retention of elongation at break after intense UV exposure. PA X.Y containing compositions with X + Y> 18 were formulated to satisfy this strict criterion. The compositions comprising a PA X.Y with X + Y> 20 lead in particular to the best results. Samples of the compositions comprising X.YP PA with X + Y of 18 or less failed this test. Second group of tests: Other physical properties This second group of physical properties makes it possible to check the quality and efficiency of the sheath of the cable sheathing according to the invention. Oven formation during two pulls is Moisture Absorption and Blister Resistance: Samples are maintained at 50% RH (Relative Humidity) at 23 ° C Weeks Retention properties evaluated according to the ISO 527 test. Chemical Resistance: The samples are immersed in an aqueous solution of 5.8% by weight of formic acid at 40 ° C for one week. The retention of the tensile properties is evaluated according to the ISO 527 test. - 41 - Properties V VI VII I il III Machinability in the tube Medium Average Average Good Good Good Absorption 8.0% 3.3% 3.0% 2.1% 2.1% 1.4% Moisture Resistance to Wrong Wrong Wrong Average Good Good Blistering Chemical Resistance Medium Medium Average Good Good Good - 42 - Machinability: Extruded samples from compositions I, II are observed and III according to the invention are easier to extrude into tubes compared to other comparative samples. On the other hand, the tubes extruded using compositions I, II, III of the invention are glossy without surface defects. Moisture absorption and resistance to blistering: It is observed that the extruded samples from compositions I, II and III according to the invention have a much lower moisture retention and no blistering defects on the surface. compared to other comparative examples.

Chemical Resistance: It is observed that the extruded samples from compositions I, II and III according to the invention have a better resistance to formic acid compared to other comparative samples because they better retain their mechanical properties.

Claims (18)

REVENDICATIONS1. Use of a composition comprising: a) at least one aliphatic polyamide containing at least two units corresponding to the following general formula: XY in which: XY represents a unit obtained by polycondensation of: - a diamine containing X carbon atoms and - a dicarboxylic acid containing Y carbon atoms, the sum X + Y being strictly greater than 18, b) at least one UV absorber and optionally at least one UV stabilizer, c) at least one antioxidant, for producing a mono- or cable cladding multilayer 20 resistant to termite damage. A composition comprising: a) at least one aliphatic polyamide containing at least two units corresponding to the following general formula: XY in which: XY represents a unit obtained by polycondensation of: - a diamine containing X carbon atoms and - a dicarboxylic acid containing Y carbon atoms, the sum X + Y being strictly greater than 18, b) at least one UV absorber and optionally at least one UV stabilizer, c) at least one antioxidant, the ratio by weight of the total amount of the antioxidant (s) and the total amount of the UV absorber (s) and UV stabilizer (s) being less than or equal to 0.7. 3. Composition according to claim 2, wherein said composition does not contain polyhydric alcohol or polyhydroxy polymer, said component being different from hindered phenols. 4. A composition according to any one of claims 2 to 3, wherein X is selected from 6 to 12, Y is selected from 10 to 18 and / or the sum of X + Y is greater than or equal to 20. The composition of claim 4 wherein the polyamide is selected from PA 6.14, PA 6.18, PA 10.10, PA 10.12, PA 10.14, PA 12.12 and mixtures thereof. 6. Composition according to any one of claims 2 to 5, wherein the UV absorber or absorbers are selected from black UV absorbers (L1). The composition of claim 6, wherein the composition comprises at least one metal antioxidant or a heat stabilizer. The composition of claim 7, wherein the composition comprises at least one dye or pigment, said dye or pigment being different from a black dye and a black pigment. 9. A composition according to any one of claims 7 to 8, wherein the composition comprises at least one UV stabilizer selected from HALS amines (hindered amine photostabilizers) and HALS aminoethers. 10. Composition according to claim 2 or 9, wherein the composition comprises at least one UV absorber selected from organic and / or inorganic UV absorbers (L2) selected from UV absorbers benzophenone, UV absorbers benzotriazole and TiO2 optionally coated with rutile, said UV absorber. 11. Composition according to any one of claims 2 to 10, wherein the one or more antioxidants are chosen from hindered phenolic antioxidants and aromatic secondary amines, and preferably hindered phenolic antioxidants. 12. Composition according to any one of claims 2 to 11, wherein the composition comprises at least one antioxidant chosen from organophosphites, organophosphonites and / or thio antioxidants. 13. Composition according to any one of claims 2 to 12, wherein the composition comprises at least one additive selected from plasticizers and impact resistance modifiers. Cable sheathing comprising at least one layer comprising a composition according to any one of Claims 2 to 13. Cable sheath according to claim 14, wherein it comprises as an outer layer or a coating layer a layer consisting of a composition according to any one of claims 2 to 13. 16. A method of manufacturing a cable jacket according to claim 14 or 15, by performing at least the following steps: i) melt blending the various ingredients of the composition (s) of the (or of each), and ii) extruding (or coextruding) the mixture (s) at a temperature of the extruder barrel in the range of 180 ° C to 280 ° C. 17. The method of claim 16, wherein it comprises only a melt mixing step or an extrusion (or coextrusion) step. 18. Use of a cable jacket according to any one of claims 14 to 15 or as manufactured according to claims 16 to 17 for preventing and / or protecting a cable, in particular an electric cable or a fiber optic cable. , termite damage and possibly light, heat, wind, water, moisture, soils, oil, fat, jelly, other insects, and / or or folds.