Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
  • C08L77/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
  • C08F210/02—Ethene
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B11/00—Making preforms
  • B29B11/06—Making preforms by moulding the material
  • B29B11/10—Extrusion moulding
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F2/00—Processes of polymerisation
  • C08F2/01—Processes of polymerisation characterised by special features of the polymerisation apparatus used
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
  • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
  • C08F220/10—Esters
  • C08F220/12—Esters of monohydric alcohols or phenols
  • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
  • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
  • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
  • C08F220/10—Esters
  • C08F220/12—Esters of monohydric alcohols or phenols
  • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
  • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
  • C08F220/1804—C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/04—Homopolymers or copolymers of ethene
  • C08L23/08—Copolymers of ethene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/04—Homopolymers or copolymers of ethene
  • C08L23/08—Copolymers of ethene
  • C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
  • C08L23/0869—Acids or derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
  • C08L33/04—Homopolymers or copolymers of esters
  • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
  • C08L33/08—Homopolymers or copolymers of acrylic acid esters
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
  • C08F2500/12—Melt flow index or melt flow ratio
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2207/00—Properties characterising the ingredient of the composition
  • C08L2207/04—Thermoplastic elastomer

Definitions

• the present invention relates to the use of a copolymer of ethylene and acrylate (s) having a melt flow index (MFI) greater than or equal to 50 g / 10 minutes, obtained by a copolymerization process radical under high pressure carried out in a tubular reactor, for modifying the melt rheology of a thermoplastic composition.
• MFI melt flow index
• the present invention is also related to a thermoplastic composition, in particular intended to be extruded or injected by molding, comprising one or more copolymers of ethylene and acrylate (s), as defined previously, in a content ranging from 0.1 to 20% by weight, and one or more thermoplastic polymers.
• a thermoplastic composition in particular intended to be extruded or injected by molding, comprising one or more copolymers of ethylene and acrylate (s), as defined previously, in a content ranging from 0.1 to 20% by weight, and one or more thermoplastic polymers.
• the invention also relates to a process for preparing said thermoplastic composition and its use for the manufacture, in particular for injection molding, of a workpiece.
• Thermoplastic parts which can be used in the electronics, automotive, computer, appliance or electrical industries, are generally prepared from thermoplastic compositions that are processed or processed. form through a variety of processes, for example a process of extrusion, injection molding, blow molding (such as extrusion blow molding or injection blow molding), compression molding or thermoforming process.
• the injection molding process makes it possible in particular to manufacture in a single operation finished parts, capable of displaying complex shapes, in very large quantities.
• Such a process most often consists in pouring a thermoplastic composition in the form of granules, optionally in the presence of additives, such as dyes and / or plasticizers, in a hopper for feeding a heated sheath.
• the thermoplastic composition is thus softened in the molten state and then mixed and entrained, by means of a piston screw, of endless type, housed in the sheath, to a mold, cooled and sealed, having the shape of the part to be produced.
• the thermoplastic composition thus takes shape and solidifies.
• the mold used for shaping is opened to recover the part.
• the extrusion process makes it possible to manufacture long pieces such as tubes, pipes or semi-finished products such as plates, optical fibers or profiles.
• a process is most often to pour a thermoplastic composition in the form of granules, optionally in the presence of additives, such as dyes and / or plasticizers, in a hopper for feeding an extruder.
• the composition is heated and softened, then mixed by the presence of a worm.
• the screw causes the thermoplastic composition to exit the extruder.
• the extruder output head gives shape to the part to be produced.
• the piece comes out continuously and is cooled to be cut to the desired length.
• thermoplastic compositions generally comprise at least one thermoplastic polymer and optionally additives which are selected according to the technical applications envisaged, the production costs and the desired level of performance with respect to the mechanical properties of the parts produced.
• thermoplastic parts obtained must have, once cooled, sufficiently satisfactory mechanical properties with respect to the technical field envisaged, for example in terms of impact resistance, elastic stress, flexural modulus, stiffness or from the stress to breaking.
• Reinforcing fillers such as glass fibers are commonly employed in thermoplastic compositions to improve the mechanical properties of parts once cooled.
• thermoplastic compositions employed must also have a rheological behavior, that is to say, rheological properties, in the molten state compatible with the shaping processes mentioned previously.
• these compositions must be sufficiently fluid in the molten state to be able to be mixed, handled and driven easily and efficiently in the devices used for their shaping such as injection molds.
• the thermoplastic compositions must have a sufficiently low melt viscosity to be able to be effectively implemented in the transformation processes without significantly increasing the production costs related to the characteristics and parameters of the devices of the invention. formatting.
• thermoplastic parts In other words, the decrease in the viscosity of thermoplastic compositions in the molten state is generally accompanied by an uncontrolled degradation of the desired mechanical properties of the parts once cooled.
• thermoplastic polymers having a low viscosity makes it possible to increase the melt flowability of the thermoplastic compositions but leads, in parallel with a degradation of the mechanical properties, in particular of the impact resistance, of the parts obtained. .
• additives In general, the presence of additives is likely to pose a problem of increasing manufacturing costs while continuing to induce negative effects on the mechanical properties of manufactured parts. In addition, the addition of additives can lead to problems of homogeneity during the preparation of the thermoplastic composition before carrying out the shaping, which most often results in a heterogeneity at the surface of the surface. room.
• patent applications US 2006/01 89747 and US 2006/021 18 describe the use of copolymers comprising at least one unit is known from an olefin and at least one unit is known from an ester (meth ) acrylic of an aliphatic alcohol having a melt flow index (MFI) greater than or equal to 50 g / 10 minutes, obtained by a polymerization process conducted in an autoclave reactor, to increase the fluidity in the state melted with a semi-crystalline thermoplastic polyamide or a polyester.
• MFI melt flow index
• thermoplastic compositions comprising copolymers, as described above, obtained by a polymerization process in an autoclave reactor, still lead to parts which, once cooled, have mechanical properties, in particular a modulus in flexion and a resistance to shock, unsatisfactory compared to the desired technical applications.
• one of the objectives of the present invention is to implement compounds capable of effectively modifying the melt rheological properties of compositions based on thermoplastic polymer (s) while mitigating the degradation of mechanical properties of the thermoplastic parts obtained after shaping.
• thermoplastic compositions sufficiently fluid in the molten state to be implemented efficiently and easily in various processing or shaping processes, including injection molding, while being able to lead to parts having good mechanical properties compared to the envisaged technical applications.
• the object of the invention is more particularly to increase the melt flowability, that is to say to reduce the viscosity, of the thermoplastic compositions used during extrusion process or injection molding while leading to pieces having satisfactory impact resistance.
• the present invention therefore particularly relates to the use of a copolymer of ethylene and acrylate (s) having a melt flow index (MFI) greater than or equal to 50 g / 10 minutes, obtained by a high-pressure radical copolymerization process carried out in a tubular reactor, for modifying the melt rheology of a thermoplastic composition; the fluidity index in the state melting (MFI) being measured at a temperature of 90 ° C under a load of 2160 grams.
• MFI melt flow index
• the invention relates in particular to the use of a copolymer of ethylene and acrylate (s), such as previously described, for modifying the rheological properties of the melt state of a composition comprising at least one thermoplastic polymer.
• the copolymer used according to the present invention has a melt flow index (MFI) greater than or equal to 50 g / 10 minutes, as defined above, and is obtained by means of a radical copolymerization process. under high pressure carried out in a tubular reactor between ethylene and one or more acrylates.
• MFI melt flow index
• the copolymer comprising at least one unit which is known from ethylene and at least one unit which is known from one or more acrylates according to the present invention has the advantage of, on the one hand, increasing the fluidity in the molten state.
• a thermoplastic composition which facilitates its implementation during processing or shaping processes and, on the other hand, to mitigate the degradation of the mechanical properties of a part that can be prepared from of such a thermoplastic composition.
• the use of the copolymer according to the invention makes it possible to reduce the melt viscosity of a thermoplastic composition, which greatly facilitates its implementation during an extrusion or injection molding process while guaranteed piece by piece obtained a shock resistance satisfactory in relation to the field and the envisaged technical applications.
• the use of the copolymer according to the invention makes it possible to preserve, to a certain extent, even to prevent uncontrolled deterioration of the mechanical parameters, in particular of the impact resistance, of parts compared to the use of a thermoplastic composition free of heat.
• additives namely consisting of one or more thermoplastic polymers.
• the use of the copolymer of ethylene and acrylate (s) according to the invention makes it possible to further preserve the mechanical properties, in particular the impact resistance, of the parts produced, the copolymer having identical patterns and obtained by high pressure radical copolymerization carried out in an autoclave reactor.
• the physical properties conferred by the high-pressure radical copolymerization process carried out in a tubular reactor make it possible more efficiently to influence the fluidity of the thermoplastic compositions in the molten state as well as the mechanical properties of the parts produced than a process of high pressure radical copolymerization carried out in an autoclave reactor.
• thermoplastic compositions in the molten state while guaranteeing good mechanical properties to the parts obtained from these compositions.
• the copolymer of ethylene and acrylate (s) according to the invention has the advantage of facilitating the implementation of the transformation or shaping processes of the thermoplastic compositions, in particular extrusion processes and injection molding, without increasing the production costs associated with these processes.
• the use of the ethylene-acrylate copolymer according to the invention improves the implementation of an injection molding process without having to change the size of the mold or increase the pressure exerted in the unit. injection comprising the heated sheath.
• high pressure means a pressure greater than 50 MPa.
• thermoplastic composition comprising:
• thermoplastic polymers and one or more copolymers of ethylene and of acrylate (s) having a melt flow index (MFI) greater than or equal to 50 g / 10 minutes, obtained by a process of radical copolymerization under high pressure in a tubular reactor, in a content ranging from 0.1 to 20% by weight, calculated on the total weight of the composition; the melt flow index (MFI) being measured at a temperature of 90 ° C under a load of 2160 grams.
• MFI melt flow index
• thermoplastic composition according to the invention has a melt flow sufficiently high to be effectively implemented in different processing processes for preparing parts.
• thermoplastic composition in the molten state has a high fluidity at the shear rates imposed by shaping processes.
• thermoplastic composition has a sufficiently low melt viscosity to be shaped efficiently in an extrusion or injection molding process to produce thermoplastic parts.
• thermoplastic composition thus makes it possible to obtain parts, in particular molded or extruded, the mechanical properties of which, in particular the impact resistance, are preserved.
• the present invention also relates to a process for preparing the thermoplastic composition as defined above comprising at least one mixing step:
• thermoplastic polymers one or more thermoplastic polymers
• melt flow index (MLI) of greater than or equal to 50 g / 10 minutes, obtained by a process of radical copolymerization under high pressure in a tubular reactor, in a content ranging from 0.1 to 10% by weight, calculated on the total weight of the mixture; the melt flow index (MLI) being measured at a temperature of 90 ° C under a load of 2160 grams.
• the preparation method according to the invention is easy to implement.
• the mixing step may advantageously comprise an extrusion step.
• thermoplastic composition as described above for the preparation, especially for extrusion or injection molding, of a part.
• the invention also relates to a part that can be obtained from the thermoplastic composition as described above, preferably by a process of extrusion or injection molding of said thermoplastic composition.
• the part thus obtained advantageously has a satisfactory impact resistance.
• the piece thus obtained can in particular be used in the automotive field, electrical industry, telecommunication, computer or electronics.
• the melt flow index (called the Melt Flow Index in English) of a polymer corresponds to the elapsed mass of the polymer in the molten state through an oblong die, in particular of cylindrical shape, for a given temperature under given temperature conditions.
• melt flow index is measured according to commonly used methods for characterizing thermoplastic materials to obtain information on the extrudability as well as the possibilities of shaping the material such as those described. according to ISO 1133 at a temperature of 90 ° C under a load of 2160 grams (units expressed in g / l O minutes).
• melt flow indexes such as those mentioned below, were measured at a temperature of 90 ° C. under a load of 2160 grams (units expressed in g / 10 minutes) according to ISO 1133 unless otherwise indicated.
• the invention relates to the use of a copolymer of ethylene and acrylate (s), having a melt flow index (MFI) greater than or equal to 50 g / 10 minutes. obtained by a high pressure radical copolymerization process carried out in a tubular reactor to modify the melt rheology of a thermoplastic composition.
• MFI melt flow index
• the copolymer of ethylene and acrylate (s) according to the invention has a melt flow index (MFI) of greater than or equal to 50 g / 10 minutes, preferably ranging from 50 to 900 g / l. O minutes, and more preferably ranging from 300 to 600 g / l O minutes.
• MFI melt flow index
• the copolymer of ethylene and acrylate (s) used in accordance with the invention preferably has a melt flow index (MFI) of greater than 50 g / 10 minutes, which means that the value of 50 g / l 10 minutes is excluded, that is to say that the melt index is strictly greater than 50 g / l O minutes, preferably a melt flow index (MFI) varying from 300 to 600 g / 10 minutes.
• MFI melt flow index
• the copolymer of ethylene and acrylate (s) used according to the invention is a copolymer comprising at least one unit derived from ethylene and at least one unit is known from at least one acrylate.
• the pattern is known from at least one acrylate may be derived from a mixture of several acrylates.
• the ethylene-acrylate copolymer according to the invention comprises at least one unit derived from ethylene and at least one unit is known from an acrylate.
• the copolymer according to the invention is preferably a copolymer of ethylene and acrylate.
• the acrylate is especially chosen from the group consisting of alkyl (meth) acrylates, in particular C 1 -C 30 alkyl (meth) acrylates, arylalkyl (meth) acrylates and (meth) acrylates having an epoxy group.
• the alkyl and arylalkyl groups may be linear or branched and contain from 1 to 30 carbon atoms, preferably from 1 to 24 carbon atoms.
• the alkyl and arylalkyl groups may also contain ether or thioether functions.
• the alkyl (meth) acrylates are selected from the group consisting of methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, acrylate and the like. 2-ethylhexyl, cyclohexyl acrylate, n-octyl acrylate, methyl methacrylate, ethyl methacrylate and butyl methacrylate, and mixtures thereof.
• the (meth) acrylates having an epoxy group are selected from the group consisting of glycidyl methacrylate, glycidyl acrylate and mixtures thereof.
• the acrylate is chosen from the group consisting of alkyl (meth) acrylates, in particular C 1 -C 30 alkyl (meth) acrylates, and more particularly alkyl (meth) acrylates. in C 1 -C 24.
• the acrylate is selected from the group consisting of methyl acrylate, butyl acrylate, ethyl-2-hexyl acrylate, or mixtures thereof, especially butyl acrylate.
• the copolymer according to the invention may optionally comprise one or more additional comonomers different from ethylene and acrylate.
• the additional comonomers are selected from the group consisting of olefinic comonomers.
• the olefinic comonomers may be chosen in particular from the group consisting of carboxylic acid anhydrides, vinyl esters, such as vinyl acetate or pivalate acetate, alpha-olefins such as propene, 1-butene and the like.
• 1-octene, 1-octene and 4-methyl-1-pentene unsaturated carboxylic acids such as (meth) acrylic acid, maleic acid and fumaric acid, acid derivatives ( meth) acrylics such as (meth) acrylonitrile and (meth) acrylic amide, vinyl ethers such as vinyl methyl ether and vinyl phenyl ether and aromatic vinyl compounds such as styrene and G alpha-methyl styrene , or their mixtures.
• unsaturated carboxylic acids such as (meth) acrylic acid, maleic acid and fumaric acid, acid derivatives ( meth) acrylics such as (meth) acrylonitrile and (meth) acrylic amide, vinyl ethers such as vinyl methyl ether and vinyl phenyl ether and aromatic vinyl compounds such as styrene and G alpha-methyl styrene , or their mixtures.
• unsaturated carboxylic acids such as (meth) acrylic acid, maleic acid and fumaric
• the content by weight of the additional comonomer (s) varies from 0.01% to 3% by weight, relative to the total weight of the copolymer.
• the copolymer employed according to the invention does not contain additional olefin comonomers other than ethylene and acrylate.
• the copolymer used according to the invention comprises:
• At least one unit is known from ethylene
• At least one unit is known from at least one alkyl (meth) acrylate, in particular a C 1 -C 24 alkyl methacrylate, preferably chosen from the group consisting of methyl acrylate, acrylate and the like; butyl and ethyl-2-hexyl acrylate and mixtures thereof.
• alkyl (meth) acrylate in particular a C 1 -C 24 alkyl methacrylate, preferably chosen from the group consisting of methyl acrylate, acrylate and the like; butyl and ethyl-2-hexyl acrylate and mixtures thereof.
• the copolymer according to the invention preferably comprises at least one unit derived from ethylene and at least one unit is known from butyl acrylate.
• the copolymer used according to the invention is advantageously a copolymer of ethylene and butyl acrylate.
• the content by weight of ethylene may vary from 50 to 95% by weight, preferably from 55 to 80% by weight, relative to the total weight of the copolymer.
• the content by weight of the acrylate may vary from 5 to 50% by weight, preferably from 15 to 40% by weight, relative to the total weight of the copolymer.
• the copolymer used according to the invention comprises:
• the contents by weight being calculated with respect to the total weight of the copolymer.
• the copolymer used according to the invention has a melt index ranging from 300 to 600 g / 10 minutes and comprises:
• At least one unit is known from ethylene
• At least one unit is known from at least one alkyl (meth) acrylate, in particular a C 1 -C 24 alkyl methacrylate, preferably chosen from the group consisting of methyl acrylate, acrylate and the like; butyl and ethyl-2-hexyl acrylate and mixtures thereof.
• the copolymer used according to the invention preferably comprises at least one unit derived from ethylene and at least one unit is known from butyl acrylate.
• the copolymer employed according to the invention is advantageously a copolymer of ethylene and of butyl acrylate having a melt index ranging from 300 to 600 g / 10 minutes.
• the copolymer used according to the invention is sold under the trade name Lotryl® T35BA320T by the company Arkema France.
• the copolymer of ethylene and acrylate (s) is used to modify the melt rheological properties of a thermoplastic composition.
• the copolymer of ethylene and acrylate (s) is used to increase the melt flowability of a thermoplastic composition.
• the copolymer of ethylene and acrylate (s) is used preferentially to reduce the melt viscosity of a thermoplastic composition.
• the copolymer of ethylene and of acrylate (s) also makes it possible to reduce the density or the level of contraction of the thermoplastic composition, in particular in a mold, which makes it possible to reduce any deformations of the part obtained.
• the copolymer of ethylene and acrylate (s) also makes it possible to modify the flow, in particular the vertical flow, of the thermoplastic composition.
• thermoplastic composition means a composition comprising at least one thermoplastic polymer.
• the copolymer of ethylene and acrylate (s) is used to modify the melt rheological properties of a composition comprising at least one thermoplastic polymer as defined below, preferably a polyamide.
• the process for preparing the copolymer according to the invention comprises a step of radical copolymerization under high ethylene and at least one acrylate applied in a tubular reactor.
• the radical copolymerization generally takes place in the presence of one or more initiators.
• the initiator (s) make it possible to form free radicals in order to initiate the radical copolymerization of ethylene.
• the initiator (s) may be chosen from the group consisting of organic peroxides, oxygen, azobisisobutyronitrile (AIBN) and mixtures thereof.
• the initiator (s) is (are) chosen from the group consisting of organic peroxides, oxygen and mixtures thereof.
• the initiator (s) is (are) chosen from the group consisting of organic peroxides.
• the organic peroxides are selected from the group consisting of peroxy esters, dialkyl peroxides, hydroperoxides or peroxyketals.
• Such peroxides are sold especially by Arkema under the trade name Luperox®.
• peroxy esters examples include t-butyl peroxy-2-ethylhexanoate (Luperox® 26), t-butyl peroxyacetate (Luperox® 7), t-amyl peroxyacetate (Luperox® 555), t-butyl perbenzoate (Luperox® P), t-amyl perbenzoate (Luperox® TAP) and OO-t-butyl 1- (2-ethylhexyl) monoperoxycarbonate (Luperox® TBEC).
• dialkyl peroxides examples include 2,5-dimethyl-2,5-di- (t-butylperoxy) hexane (Luperox® 101), dicumyl peroxide (Luperox® DC), alpha -alpha'-bis (t-butylperoxy) diisopropylbenzene (Luperox® L40), di-t-butylperoxide (Luperox® DI), di-t-amylperoxide (Luperox® DTA) and 2,5-diisopropylbenzene dimethyl-2,5-di- (t-butylperoxy) hexyne-3 (Luperox® 130).
• hydroperoxide mention may be made of tert-butylhydroperoxide (Luperox® TBH 70).
• peroxyketals By way of example of peroxyketals, mention may be made of 1,1-di- (t-butylperoxy) -3,3,5-trimethylcyclohexane (Luperox® 23 1), ethyl-3,3-di- -butylperoxybutyrate) (Luperox® 233) or ethyl-3,3-di- (t-amylperoxybutyrate) (Luperox® 533).
• the organic peroxides are chosen from the group consisting of dialkyl peroxides, in particular 2,5-dimethyl-2,5-di- (t-butylperoxy) hexane sold under the trade name Luperox® 101.
• the organic peroxide (s) is or are generally diluted in a solvent or a mixture of solvents.
• the solvent or solvents may be chosen from C 1 -C 20 alkanes, in particular C 3 -C 10 alkanes, and more particularly C 8 -C 8 alkanes, and preferably heptane.
• the initiator (s) is (are) or is preferably present in a mass quantity of between 20 and 1000 ppm relative to the amount of ethylene.
• the copolymerization of ethylene is carried out at an initiation temperature ranging from 100 to 200 ° C, preferably from 120 to 160 ° C.
• the radical copolymerization preferably takes place at a pressure ranging from 500 bar (50 MPa) to 3000 bar (300 MPa), preferably from 1200 bar (120 MPa) to 3000 bar (300 MPa), better still 1200 bar (120 MPa). ) at 2600 bar (260 MPa).
• the high pressure radical copolymerization takes place in a tubular reactor at a temperature which may be between 150 ° C. and 320 ° C.
• the introduction of the mixture of ethylene and acrylate (s) as defined above, is preferably carried out at the top of the tubular reactor.
• the initiator or the mixture of initiators is injected with the aid of a high pressure pump at the top of the reactor, after the place of introduction of the mixture of ethylene and acrylate (s).
• the mixture of ethylene and acrylate (s) may be injected into at least one other point of the reactor, this injection being itself followed by a new injection of initiator or of a mixture of initiators.
• multipoint injection technique When the multipoint injection technique is used, the mixture is preferably injected in such a way that the weight ratio of the mixture injected at the reactor inlet to the totality of the injected mixture is between 10 and 90%.
• the process for preparing a copolymer of ethylene and acrylate (s), as defined above comprises a high pressure radical copolymerization step carried out in a tubular reactor, - ethylene,
• initiators in particular chosen from the group consisting of organic peroxides, oxygen and their mixtures.
• the acrylate is preferably butyl acrylate.
• the initiator is preferably an organic peroxide selected from the group consisting of dialkyl peroxides, especially 2,5-dimethyl-2,5-di- (t-butylperoxy) hexane.
• thermoplastic composition comprises:
• thermoplastic polymer at least one thermoplastic polymer
• ⁇ at least one known pattern is ethylene
• ⁇ at least one known pattern is at least one acrylate, said copolymer being obtained by a high-pressure radical copolymerization method in a tubular reactor,
• copolymer being present in the thermoplastic composition in a content ranging from 0.1 to 20% by weight relative to the total weight of the composition
• melt flow index (MFI) of the copolymer being measured at a temperature of 90 ° C under a load of 2160 grams.
• the copolymer of ethylene and acrylate (s) is as previously described.
• the copolymer of ethylene and acrylate (s) according to the invention is present in a content ranging from 0.25 to 20% by weight, preferably in a content ranging from 0.25 to 15% by weight. , preferably in a content ranging from 1 to 20% by weight, more preferably in a content ranging from 1 to 15% by weight, and still more preferably in a content ranging from 1 to 10% by weight relative to the total weight of the composition. .
• thermoplastic polymer is preferably selected from the group consisting of polyamides, polyesters, polycarbonates, phenylene polysulfides, polyacetals and mixtures thereof.
• the thermoplastic polymer is a polyamide, in particular a semi-aromatic polyamide.
• the semi-aromatic polyamide comprises at least one first semi-aromatic repeating unit obtained from the polycondensation of a diamine and an aromatic dicarboxylic acid.
• the diamine advantageously comprises from 4 to 36 carbon atoms.
• the diamine can be chosen from aliphatic diamines, cycloaliphatic diamines and alkylaromatic diamines. These diamines can be linear. They may also be branched and have at least one alkyl branch on the main chain, this alkyl branch may itself be linear or branched.
• the diamine When the diamine is aliphatic and linear, it corresponds to the formula H 2 N- (CH 2 ) x -NH 2 .
• diamines all have the advantage of being biores sourced and include organic carbon is known biomass, which may be determined according to ASTM D6866.
• the diamine is cycloaliphatic, it can be chosen from 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-aminocyclohexyl) butane, bis- (3-methyl-4-aminocyclohexyl) methane (BMACM or MACM), p-bis (aminocyclohexyl) ) -methane (PACM) and isopropylidene di (cyclohexylamine) (PACP).
• bis (3,5-dialkyl-4-aminocyclohexyl) methane bis (3,5-dial
• the cycloaliphatic diamine may also comprise the following carbon skeletons: norbornyl methane, cyclohexylmethane, dicyclohexylpropane, di (methylcyclohexyl), di (methylcyclohexyl) propane.
• norbornyl methane norbornyl methane
• cyclohexylmethane dicyclohexylpropane
• di (methylcyclohexyl) propane di (methylcyclohexyl), di (methylcyclohexyl) propane.
• the diamine when the diamine is alkylaromatic, it may be chosen from 1,3-xylylenediamine and 1,4-xylylenediamine.
• the diamine is an aliphatic diamine.
• the diamine is a linear aliphatic diamine.
• the aromatic dicarboxylic acid may be chosen from terephthalic acid (denoted T), isophthalic acid (denoted I), phthalic acid and naphthalenic acids.
• the aromatic dicarboxylic acids which have just been mentioned may also comprise one or more alkyl branches, these alkyl branches may themselves be linear or branched. 2-methyl-terephthalic acid can thus be mentioned.
• the semi-aromatic polyamide has a melting temperature greater than 240 ° C., advantageously between 240 ° C. and 3 ° C., and more particularly between 260 ° C. and 280 ° C.
• the aromatic dicarboxylic acid is terephthalic acid (T).
• the semi-aromatic polyamide may comprise more than 50 mol% of repeating unit (s) semi-aromatic (s), advantageously more than 60 mol%.
• the semi-aromatic polyamide may consist of 100 mol% of one or more semi-aromatic repeating units as previously described.
• the semi-aromatic polyamide may be a homopolymer and consist only of first repeating units resulting from the polycondensation reaction of a diamine and an aromatic dicarboxylic acid.
• the semiaromatic polyamide may be chosen from homopolyamides 6. T, 9. T, 10. T, 11.1, 12. T, 14. T, 8.1, 6.1, 9.1, 10. 1 , 1 1. 1, 12. 1, 14. 1 and 18. 1.
• the semiaromatic polyamide may be a copolymer consisting of one or more first repeating units is sus of the polycondensation reaction of a diamine and two aromatic dicarboxylic acids or the polycondensation reaction two diamines and an aromatic dicarboxylic acid.
• the semi-aromatic polyamide may be chosen from copolyamides 6. T / 6.1, 9. T / 9.1, 10.T / 10.I, 1 L.T / 1 1 .1 and 12.
• the semi-aromatic polyamide may be chosen from copolyamides 6. T / 9. T, 6.T / 10.T, 6. T / 1 T, 6.T / 12.T, 9.T / 10.T, 9. T / 1 T, 9.T / 12. T, 10. T / 11 .T, 10.T / 12.T and 1 1 .T / 12.T.
• a similar list can be established by replacing terephthalic acid (T) with isophthalic acid (I).
• the semiaromatic polyamide may be a copolymer comprising first repeating units resulting from the polycondensation reaction of at least two diamines and at least two aromatic dicarboxylic acids.
• the semi-aromatic polyamide of the composition according to the invention can also comprise at least one additional repeating unit (or a second repeating unit) distinct from the first semiaromatic repeating unit or units as described above.
• This additional repeating unit may be selected from the group consisting of a unit obtained from an aminocarboxylic acid, a unit obtained from a lactam and a unit having the formula (diamine Ca). (diacid in Cb), with "a” representing the number of carbon atoms of the diamine and "b” representing the number of carbon atoms of the diacid.
• a and b are each between 4 and 36.
• this additional repeating unit is obtained from an aminocarboxylic acid
• this aminocarboxylic acid may be chosen from 9-aminononanoic acid (9), 1-O-aminodecanoic acid (10) and O-aminoundecanoic acid. (1 1), 12-aminododecanoic acid (12) and 11-aminoundecanoic acid (1 1).
• the aminocarboxylic acid can also be branched. By way of example, mention may be made of N-heptyl-1-aminoundecanoic acid.
• this lactam may be chosen from pyrrolidinone, 2-piperidinone, enantholactam, caprylolactam, pelargolactam, decanolactam (10), undecanolactam (1 ) and lauryllactam (12).
• this additional repeating unit is a unit corresponding to the formula (diamine Ca).
• (Cb diacid) it is obtained from the polycondensation of a diamine, the diamine Ca, and a dicarboxylic acid, diacid Cb, it being specified that this dicarboxylic acid is not an aromatic dicarboxylic acid .
• This diamine in Ca can be chosen from the group consisting of aliphatic diamines, cycloaliphatic diamines and alkylaromatic diamines. These diamines in Ca can be linear. They may also be branched and have at least one alkyl branch on the main chain, this alkyl branch may itself be linear or branched.
• the diamines described above for obtaining the first semi-aromatic repeating unit can also be used as Ca diamine for obtaining the second repeating unit.
• the diamines in Ca can be chosen from the diamines used to obtain the semi-aromatic unit described above.
• the dicarboxylic acid (Cb diacid) used to obtain the additional repeating unit may be chosen from aliphatic dicarboxylic acids and cycloaliphatic dicarboxylic acids. These dicarboxylic acids can be linear. They may also be branched and have at least one alkyl branch on the main chain, this alkyl branch may itself be linear or branched.
• the dicarboxylic acid (Cb diacid) is aliphatic and linear, it can be chosen from succinic acid (4), pentanedioic acid (5), adipic acid (6), heptanedioic acid (7) and ), octanedioic acid (8), azelaic acid (9), sebacic acid (10), undecanedioic acid (1 1), dodecanedioic acid (12), syl alcohol acid (13), tetradecanedioic acid (14), hexadecanedioic acid (16), octadecanedioic acid (18), octadecenedioic acid (18), eico-sanedioic acid (20), docosanedioic acid (22) and fatty acid dimers containing 36 carbons.
• succinic acid (4) pentanedioic acid (5), adipic acid (6), hept
• the fatty acid dimers mentioned above are dimerized fatty acids obtained by oligomerization or polymerization of unsaturated monobasic fatty acids with a long hydrocarbon chain (such as linoleic acid and oleic acid), as described in particular in the document EP 0 471566.
• the dicarboxylic acid (Cb diacid) is cycloaliphatic, it may comprise the following carbon skeletons: norbornyl methane, cyclohexane, cyclohexylmethane, dicyclohexylmethane, dicyclohexylpropane, di (methylcyclohexyl), di (methyl) cyclohexyl) propane.
• the additional repeating unit of the semiaromatic polyamide may in particular designate the following units 6, 1 1, 12, 6, 10, 6, 12, 6, 14, 6, 1 8, 10, 10, 10, 12, 10. 14, 10. 18 and 12. 12.
• the semiaromatic polyamide may be a copolymer consisting of first semiaromatic repeating units resulting from the polycondensation reaction of a diamine and an aromatic dicarboxylic acid, additional repeating units is known. or of an aminocarboxylic acid or of a lactam, or of the polycondensation of a diamine of Ca and a diacid of Cb as described above
• copolyamides are of particular interest: they are copolyamides corresponding to one of the formulas chosen from 1 1/6. T, 12/6. T, 6. 10/6. T, 6. 12/6. T, 10. 10/6. T, 10. 12/6. T, 12. 12/6. T, 1 1/9. T, 12/9. T, 6. 10/9. T, 6. 12/9. T, 10. 10/9. T, 10. 12/9. T, 12. 12/9. T, 1 1 / 10.T, 12 / 10.T, 6. 10 / 10.T, 6. 12 / 10.T, 10. 10 / 10.T, 10. 12 10.T and 12. 12 / 10. T.
• the semiaromatic polyamide may be a copolymer comprising first semi-aromatic repeating units resulting from the polycondensation reaction of at least one diamine and at least one aromatic dicarboxylic acid and second repetitive patterns are known from at least one acid aminocarboxylic acid, at least one lactam and / or the polycondensation of a diamine of Ca and a diacid Cb as described above.
• copolyamides corresponding to one of the formulas chosen from:
• first and, where appropriate, second repeating units which are or will be obtained wholly or partly from diamines, dicarboxylic acids, amino-carboxylic acids and and / or bioresourced lactams, that is to say comprising organic carbon derived from biomass, which may be determined according to ASTM D6866.
• thermoplastic polymer is a polyester.
• polyester refers to polymers which are saturated products of condensation of glycols and dicarboxylic acids or their derivatives.
• They preferably comprise the condensation products of aromatic dicarboxylic acids having 8 to 14 carbon atoms and at least one glycol selected from the group consisting of neopentyl glycol, cyclohexanedimethanol and aliphatic glycols of formula HO (CH 2 ) n OH wherein n is an integer of 2 to 10.
• n is an integer of 2 to 10.
• Up to 50 mole% of the dicarboxylic aromatic acid may be replaced by at least one other aromatic dicarboxylic acid having from 8 to 14 carbon atoms, and / or up to 20 mol% may be replaced by an aliphatic dicarboxylic acid having 2 to 12 carbon atoms.
• the polyester is selected from the group consisting of polyethylene terephthalate (PET), poly (1,4-butylene) terephthalate (PBT), 1,4-cyclohexylene dimethylene terephthalate / isophthalate and other esters derived from aromatic dicarboxylic acids such as isophthalic acid, bibenzoic acid, naphthalene dicarboxylic acid, 4,4'-diphenylenedicarboxylic acid, bis (p-carboxyphenyl) methane acid, ethylene bis p-benzoic acid, acid 1 -4 tetramethylene bis (p-oxybenzoic), ethylene bis (para-oxybenzoic) acid, 1,3-trimethylene bis (p-oxybenzoic acid) and glycols such as ethylene glycol, 1,3-trimethylene glycol 1,4-tetramethylene glycol, 1,6-hexamethylene glycol, 1,3-propylene glycol, 1,8 octamethylene glycol
• the polyester is selected from the group consisting of polyalkylene terephthalate, especially polyethylene terephthalate (PET), poly (1,4-butylene) terephthalate (PBT), 1,4-cyclohexylene dimethylene terephthalate / isophthalate.
• PET polyethylene terephthalate
• PBT poly (1,4-butylene) terephthalate
• 1,4-cyclohexylene dimethylene terephthalate / isophthalate 1,4-cyclohexylene dimethylene terephthalate / isophthalate.
• the thermoplastic polymer is a polycarbonate.
• the polycarbonate has the following general formula:
• R 1 is a divalent aliphatic, alicyclic or aromatic group; the aliphatic and alicyclic groups may contain up to 8 carbon atoms.
• R 1 By way of example of R 1, mention may be made of ethylene, propylene, trimethylene, tetramethylene, hexamethylene, dodecamethylene, poly-1,4- (2-butenylene), polyol O- (2-ethyldecylene), 1,3-cyclopentylene, 1,3-cyclohexylene, 1,4-cyclohexylene, m-phenylene, p-phenylene, 4,4'-biphenylene, 2, 2-bis (4-phenylene) propane, benzene-1,4-dimethylene.
• at least 60% of the groups R 1 in the polycarbonate and preferably all the R 1 groups are aromatic compounds of formula:
• R 2 and R 3 are divalent monocyclic aromatic radicals and Y is a linking radical in which one or two atoms separate R 2 and R 3 .
• the free valences are generally in meta or para position relative to Y.
• R 2 and R 3 may be substituted or unsubstituted phenylenes; there may be mentioned as substituents alkyls, alkenyls, halogens, nitro and alkoxy. Unsubstituted phenylenes are preferred, they may be together or separately meta or para and are preferably para.
• the linking radical Y is preferably such that an atom separates R 2 and R 3 and is preferably a hydrocarbon radical such as methylene, cyclohexylmethylene, 2-
• R1 is 2,2-bis (4-phenylene) propane which comes from bisphenol A, ie, Y is isopropylidene and R 2 and R 3 are each p-phenylene.
• the intrinsic viscosity of the polycarbonate measured in methylene chloride at 25 ° C., is between 0.3 and 1 dl / g.
• thermoplastic polymer is selected from the group consisting of polyamides, polyesters and polycarbonates and mixtures thereof.
• thermoplastic polymer is a polyamide.
• the thermoplastic polymer is present in a content ranging from 99.9 to 10% by weight, preferably in a content ranging from 99 to 40% by weight, and even more preferably in a content ranging from 80 to 50% by weight. , relative to the total weight of the composition.
• thermoplastic composition according to the invention may also comprise one or more additives chosen from the group consisting of reinforcing fillers, flame retardants, thermal stabilizers, UV stabilizers, and pigments.
• thermoplastic composition according to the invention comprises:
• At least one copolymer as defined above comprising at least one unit derived from ethylene and at least one unit derived from at least one alkyl (meth) acrylate, in particular a C 1 alkyl methacrylate; -C24, preferably selected from the group consisting of methyl acrylate, butyl acrylate and ethyl-2-hexyl acrylate and mixtures thereof,
• thermoplastic polymer chosen from polyamides, polyesters, polycarbonates, phenylene polysulfides and polyacetals, and mixtures thereof.
• the copolymer according to the invention preferably comprises at least one unit derived from ethylene and at least one unit is known from butyl acrylate.
• thermoplastic polymer is selected from the group consisting of polyamides, polyesters and polycarbonates, phenylene polysulfides, polyacetals and mixtures thereof, in particular polyamides.
• thermoplastic composition according to the invention preferably comprises:
• thermoplastic polymer chosen from the group consisting of polyamides,
• At least one copolymer of ethylene and of butyl acrylate obtained by high-pressure radical copolymerization carried out in a tubular reactor, having a melt flow index (MFI) greater than or equal to 50 g / l O minutes, preferably ranging from 300 to 600 g / 10 minutes, in a content ranging from 0.1 to 20% by weight relative to the total weight of the composition.
• MFI melt flow index
• Another object of the present invention is a process for preparing the thermoplastic composition as defined above comprising at least one mixing step:
• thermoplastic polymers one or more thermoplastic polymers, and one or more copolymers of ethylene and acrylate (s) having a melt flow index (MFI) greater than or equal to 50 g / 10 minute, obtained by a copolymerization process radical under high pressure in a tubular reactor, in a content ranging from 0.1 to 20% by weight, calculated on the total weight of the mixture.
• MFI melt flow index
• the melt flow index (MFI) of the copolymer is measured at a temperature of 90 ° C under a load of 2160 grams.
• copolymer of ethylene and acrylate (s) and the thermoplastic polymer are as previously described.
• the content of the copolymer of ethylene and acrylate (s) can vary from 0.25 to 20% by weight, preferably in a content ranging from 0.25 to 15% by weight, more preferably in a content ranging from 1 to 15% by weight, and still more preferably in a content ranging from 1 to 10% by weight, relative to the total weight of the mixture.
• the content of the thermoplastic polymer can vary from 99.9 to 10% by weight, preferably in a content ranging from 99 to 40% by weight, and even more preferably in a content ranging from 80 to 50% by weight, relative to the total weight of the mixture.
• the mixing step is a step of extruding the copolymer of ethylene and acrylate (s) and the thermoplastic polymer.
• composition according to the invention solid in the form of granules or powder.
• the mixing step proceeds at a temperature above the melting point of the matrix to be modified and below the degradation point.
• thermoplastic compositions which can be solid in the form of granules or of powder which are intended to be used in forming or processing processes for the preparation of parts.
• thermoplastic composition according to the invention is used for the preparation of a part.
• thermoplastic composition is used for the manufacture of all or part of a part.
• thermoplastic composition is used for extrusion or injection molding of a workpiece.
• thermoplastic composition is used for the injection molding of a workpiece.
• the invention also relates to a part prepared from the thermoplastic composition as defined above.
• thermoplastic composition as defined above.
• the part thus prepared may correspond to a finished part or a semi-finished part.
• a semi-finished part corresponds to a product likely to undergo one or more additional treatments to develop the finished part.
• a semi-finished part may be chosen from the group consisting of a plate, a section or optical fibers.
• the finished part may be selected from the group consisting of an injected or extruded part.
• the part prepared from the thermoplastic composition is an injected part.
• the part advantageously has mechanical properties, including impact resistance, satisfactory.
• the part can be obtained by extrusion or injection into a mold of a thermoplastic composition according to the invention, in particular by injection into a mold.
• the workpiece can be obtained by the molding injection method presented hereinafter.
• the piece can be used in particular in the field of electronics, computers, household appliances, automotive or in the electrical industry.
• the invention also relates to the use of a part as defined previously in the field of electronics, IT, appliance, automotive and electrical industry.
• the part may in particular be carried out by means of a molding injection method.
• the method employs an injection unit having a material inlet, a material outlet to a mold and one or more material drive means between the material inlet and outlet.
• the method comprises the following steps:
• thermoplastic composition as described above, in solid form into the inlet of the injection unit
• thermoplastic composition in the molten state, at the outlet of the injection unit, into a mold.
• the injection molding process thus makes it possible to obtain a part according to the invention.
• Product B 1 Copolymer composed of ethylene and butyl acrylate, of which 65% of ethylene in mas, has a melt index of 320 g / l 0 minutes and is prepared in an autoclave reactor (Lotryl® 35BA320 sold by Arkema France)
• Product B2 Copolymer composed of ethylene and butyl acrylate, of which 65% of ethylene in mas, has a melt index of 320 g / l 0 minutes and prepared in a tubular reactor (Lotryl® T 35BA320T sold by Arkema France)
• compositions (1) to (3) are prepared by mixing the constituents in the ratio of Table 1 by an extrusion process.
• the extrusion is carried out in a twin-screw co-rotating extruder whose diameter is l 6mm and the L / D ratio is 25 (Haake PTW 16/25) at a flow rate of 4kg / h for a screw speed. 250 rpm.
• the maximum temperature of the mixture is 260 ° C.
• the compositions thus obtained are then dried in order to reach a moisture content ⁇ 0.08%.
• compositions are then injected at a temperature of 260 ° C. in a mold which is regulated at a temperature of 40 ° C. using a Krauss Maffei 60-210 B l type injector. Two molds are used. A first mold to obtain 80mm x 1mm x 4mm bars and a second spiral mold (2mm).
• the impact resistance properties are measured according to IS O 179 l eA after conditioning bars 80x 10x4 at 23 ° C and 50% RH (relative humidity). The higher the resilience value (given in kJ / m 2 ), the better the impact resistance. These properties were measured at room temperature (23 ° C) and cold (-30 ° C). The values obtained are reported in Table 1.
• composition 3 containing a polyamide and a copolymer of ethylene and acrylates prepared in a tubular reactor (Product B2) with respect to the parts obtained with a composition containing only the polyamide (Product A).
• thermoplastic composition comprising the copolymer of ethylene and acrylates prepared in a tubular reactor (product B2) relative to the thermoplastic composition (composition 1) comprising only the polyamide (product A).
• composition 3 containing a polyamide and a copolymer of ethylene and acrylates prepared in a tubular reactor (Product B2) relative to the parts obtained with a composition (Composition 2) containing a polyamide and a copolymer of ethylene and of acrylates prepared in an autoclave reactor (Product B 1).

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