Classifications

• • 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
  • C08F255/00—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00
  • C08F255/02—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00 on to polymers of olefins having two or three carbon atoms
• • 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
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
  • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
  • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
• • 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
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
  • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
  • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
  • B29C48/405—Intermeshing co-rotating screws
• • 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
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
  • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
  • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
  • B29C48/41—Intermeshing counter-rotating screws
• • 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
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
  • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
  • B29C48/83—Heating or cooling the cylinders
  • B29C48/832—Heating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
• • 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
  • C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
  • C08F222/04—Anhydrides, e.g. cyclic anhydrides
  • C08F222/06—Maleic anhydride
• • 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
  • C08F255/00—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/13—Phenols; Phenolates
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
  • C08L51/06—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D151/00—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
  • C09D151/06—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J151/00—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
  • C09J151/06—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
  • C08L2666/02—Organic macromolecular compounds, natural resins, waxes or and bituminous materials

Definitions

• the present invention relates to stabilized compositions of functionalized polyolefins and in particular stabilized compositions of polyolefins functionalized with carboxylic acid groups, their esters, their anhydrides or their metal salts. It also relates to a process for their preparation and their use.
• Functionalized polyolefins are widely used, in particular as an adhesive between a layer of polyethylene (PE) and a layer of epoxy resin, for example for coating tubes.
• PE polyethylene
• epoxy resin for example for coating tubes.
• all plastic materials undergo oxidation phenomena, commonly used under the terminology “aging phenomenon”. To delay these phenomena, the most used method is the addition of antioxidant or stabilizing agents.
• phenolic antioxidants are used as stabilizer, however their combination with phosphite stabilizers is generally more effective, see US 4,290,941.
• a frequently used combination is for example a mixture of pentaerythrityl tetrakis- (3,5-di-t-butyl-4-hydroxyphenylpropionate) and tris- (2,4-di-t-butylphenyl) - phosphite.
• the problem which arises in the case of adhesives stabilized in this way, based on polyolefins functionalized by acid or anhydride groups, for example functionalized polyethylene maleic anhydride is a loss of adhesion in the long term.
• these compositions are subjected to a loss of thermal stability and to an increase in viscosity in the presence of humidity (loss of rheological stability), this phenomenon being moreover accelerated by an increase in temperature.
• the present invention aims to remedy these drawbacks by novel compositions of functionalized polyolefins having better thermal stability, better rheological stability and offering better long-term adhesion.
• compositions comprising one or more olefin polymers functionalized with at least one functionalizing agent chosen from carboxylic acids, their esters, their anhydrides and their metal salts and one or more stabilizing agents comprising one or more sterically hindered phenol groups and at most one ester function.
• compositions are no longer subjected to a loss of thermal stability or to an increase in viscosity in the presence of moisture.
• the stabilizing agents comprising one or more sterically hindered phenol groups and at most one ester function are chosen from stabilizing agents comprising one or more sterically hindered phenol groups and containing an ester function and from the stabilizing agents comprising one or more sterically hindered phenol groups and not containing an ester function.
• ester function is meant to denote for the purposes of the present invention, the ester function derived from the carboxylic acid function in the conventional sense of organic chemical (R-CO-O-R ').
• stabilizing agents comprising one or more sterically hindered phenol groups and containing an ester function
• stabilizing agents comprising one or more sterically hindered phenol groups and containing no ester function
• At least one of the stabilizing agents does not contain an ester function.
• at least one of the stabilizing agents is 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene (IRGANOX® 1330).
• the compositions according to the invention comprise, as the sole stabilizing agent, 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4- hydroxybenzyl) benzene.
• the amounts of stabilizing agent used in the compositions of the present invention depend on various factors, for example the amount of free radical initiator used, the application intended for the compositions and the nature of the functionalizing agent .
• the amount of stabilizing agent is generally between 0.001 and 1% by weight.
• the amount of stabilizing agent is greater than or equal to
• 0.001% preferably greater than or equal to 0.01%, particularly preferably greater than or equal to 0.1% by weight.
• the amount of stabilizing agent is less than or equal to 1%, preferably less than or equal to 0.75%, particularly preferably less than or equal to 0.5% by weight.
• the olefin polymers functionalized with functionalizing agents chosen from carboxylic acids, their esters, their anhydrides and their metal salts can be obtained by known techniques, for example by copolymerization or, preferably, by grafting. They are derived from polymers of linear olefins containing from 2 to 8 carbon atoms such as ethylene, propylene, 1-butene, 1-pentene, 1-hexene and 1-octene. The linear olefins preferably contain from 2 to 6 carbon atoms, more particularly from 2 to 4 carbon atoms.
• the olefin polymers can be selected from the homopolymers of the abovementioned olefins and from the copolymers of these olefins, in particular copolymers of ethylene or of propylene with one or more comonomers.
• the constituent comonomers are advantageously chosen from the olefins described above and from the diolefins comprising from 4 to 18 carbon atoms, such as 4-vinylcyclohexene, dicyclopentadiene, methylene- and ethylidene-norbornene, 1,3- butadiene, isoprene and 1,3-pentadiene.
• the polyolefins are chosen from polymers of propylene and polymers of ethylene, in particular the homopolymer of ethylene, the homopolymer of propylene, the copolymers of ethylene, the copolymers of propylene, the copolymers ethylene and propylene and mixtures thereof.
• the polymers of propylene are most often chosen from homopolymers and copolymers of propylene whose melt index (MFI), measured at 230 ° C., under a load of 2.16 kg according to standard ASTM D 1238
• the polymers of ethylene are most often chosen from homopolymers and copolymers of ethylene having a standard density between 915 and 960 kg / m- and a melt index (measured at 190 ° C. under a load of 5 kg) between 0, 1 and 200 dg / min.
• Homopolymers and copolymers of ethylene are particularly preferred. These advantageously have a standard density of at least 915 kg / m ⁇ , in particular at least 936 kg / m ⁇ .
• the standard density does not generally exceed 960 kg / kg, preferably not 953 kg / kg.
• Homopolymers and copolymers of ethylene also usually have a melt index (measured at 190 ° C. under a load of 5 kg) of at least 0.1 dg / min, preferably at least 2 dg / min .
• the fluidity index does not usually exceed 200 dg / min, more particularly not 40 dg / min.
• the functionalizing agent is generally a compound comprising vinyl unsaturation and optionally one or more aromatic rings and / or one or more carbonyl groups.
• the functionalizing agent may, for example, be chosen from unsaturated mono- or dicarboxylic acids and their derivatives, unsaturated anhydrides of mono- or dicarboxylic acids and their derivatives, unsaturated esters of mono- or dicarboxylic acids and their derivatives, unsaturated metal salts of mono- or dicarboxylic acids and their derivatives.
• the functionalizing agents preferably comprise from 3 to 20 carbon atoms.
• At least one of the olefin polymers functionalized with at least one functionalizing agent chosen from carboxylic acids, their esters, their anhydrides and their metal salts is a polymer d ethylene functionalized with maleic anhydride.
• the only functionalized olefin polymer is an ethylene polymer functionalized with maleic anhydride.
• Maleic anhydride is usually present in the functionalized ethylene polymer in an amount of 0.001 to 5% by weight, preferably 0.01 to 3% by weight and in particular 0.05 to 1% by weight.
• the ethylene polymer functionalized with maleic anhydride advantageously has a standard density of at least 915 kg / m 3 , in particular at least 936 kg / m 3 .
• the standard density does not generally exceed 960 kg / m 3 , preferably not 953 kg / m 3 .
• It also usually has a melt index (measured at 190 ° C under a load of 5 kg) of at least 0.1 dg / min, preferably at least 2 dg / min.
• the fluidity index does not usually exceed 50 dg / min, more particularly not 22 dg / min.
• the compositions according to the invention may optionally also contain the usual additives for polyolefins in an amount of up to 10% by weight, such as additional antioxidants, lubricants, fillers, dyes, nucleating agents, anti-UN agents, antacid agents, such as calcium stearate, crystallinity modifiers, such as a copolymer of ethylene and n-butyl or ethyl acrylate, metal deactivators or antistatic agents .
• One embodiment of the present invention provides for the dilution of the compositions described above in one or more non-functionalized olefin polymers.
• non-functionalized olefin polymers these are essentially the compounds mentioned above or their mixtures.
• the composition can be diluted up to 20 times, that is to say by adding up to 95% by weight of at least one non-functionalized olefin polymer, preferably up to 10 times, that is to say by adding up to 90% by weight of at least one non-functionalized olefin polymer, more than preferably up to 5 times, that is to say by adding up to at 80% by weight of at least one non-functionalized olefin polymer.
• compositions according to the invention can be prepared by any process such as in particular the processes in solution, the processes taking place in a mixer, for example a BRABE ⁇ DER® mixer or the processes taking place in an extruder. Good results are usually obtained if the compositions according to the invention are prepared by means of the process according to the invention.
• the invention also relates to the use of one or more stabilizing agents comprising one or more sterically hindered phenol groups and at most one ester function for the stabilization of olefin polymers functionalized with at least one functionalizing agent chosen from acids. carboxylic acids, their esters, their anhydrides and their metal salts.
• the stabilizing agents comprising one or more sterically hindered phenol groups and at most one ester function used for stabilization are those identified above.
• the olefin polymers which can be stabilized are those identified above.
• the invention also relates to a process for the preparation of stabilized compositions comprising one or more functionalized olefin polymers and one or more stabilizing agents, according to which one or more olefin polymers, one or more olefin polymers, are blended in a screw extruder.
• several functionalizing agents one or more radical initiators, one or more stabilizing agents comprising one or more sterically hindered phenol groups and at most one ester function, and optionally one or more additives.
• the stabilizing agents comprising one or more sterically hindered phenol groups and at most one ester function which can be introduced into the extruder are those identified above.
• a preferred case is that where at least one of the stabilizing agents introduced into the extruder does not contain an ester function.
• a particularly preferred case is that where at least one of the stabilizing agents introduced into the extruder is 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene.
• a very particularly preferred case is that where 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene is introduced into the extruder as unique stabilizing agent.
• the stabilizing agents are usually used in an amount of between 0.001 and 1% by weight, preferably between 0.01 and 0.75% by weight and particularly preferably between 0.1 and 0.5% by weight.
• olefin polymers are those identified above.
• a preferred process is that in which at least one of the olefin polymers introduced into the extruder is an ethylene polymer having a standard density of 915 to 960 kg / m 3 and a melt index, measured at 190 ° C. under a load of 5 kg, from 0.1 to 200 dg / min.
• the functionalizing agents which can be introduced into the extruder are chosen from carboxylic acids, their esters, their anhydrides and their metal salts and are essentially those indicated above.
• a preferred variant of the process is that in which at least one of the functionalizing agents introduced into the extruder is maleic anhydride.
• a very particularly preferred variant is that in which the only functionalizing agent introduced into the extruder is maleic anhydride.
• the functionalizing agents can be introduced into the extruder either in the solid state or in the molten state. In the latter case, it is necessary to have an introduction system maintained at a temperature above the melting temperature of the functionalizing agent.
• the functionalizing agents are generally used in an amount of 0.001 to 20% by weight, preferably from 0.05 to 10% by weight and in particular from 0.01 to 5% by weight.
• the grafting reaction in the process according to the invention takes place under the effect of a radical initiator.
• Organic peroxides are preferably used as radical initiator.
• t-butylcumyl peroxide 1,3-di (2-t-butylperoxyisopropyl) benzene, 3,5-bis (t-butylperoxy) -3,5-dimethyl-l, 2- dioxolane, di-t-butyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, p-menthane hydroperoxide, pinane hydroperoxide, diisopropylbenzene mono- ⁇ -hydroperoxide, cumene hydroperoxide, t-butyl hydroperoxide and mixtures thereof.
• the preferred free radical initiator is 2,5-dimethyl-2,5-di (t-butylperoxy) hexane.
• the radical initiator is generally used in the process according to the invention in an amount sufficient to allow grafting to be carried out.
• the amount is usually between 0.0001% and 1%, preferably between 0.001 and 0.5%, particularly preferably between 0.01 and 0.1% by weight.
• the process implementation temperature is generally higher than the melting temperature and lower than the decomposition temperature of the polyolefin and of the functionalized polyolefin, if necessary at an optimal temperature for the radical initiator.
• the process according to the invention generally involves processing temperatures in the range from 120 ° C to 290 ° C, preferably in the range from 140 to 250 ° C and in a particularly preferred manner in the range from 160 to 220 ° C.
• the process can also provide for the dilution of the composition in one or more non-functionalized olefin polymers.
• the non-functionalized olefin polymers are essentially the compounds mentioned above or their mixtures.
• the composition can be diluted up to 20 times, that is to say by adding up to 95% by weight of at least one non-functionalized olefin polymer, preferably up to 10 times, that is to say by adding up to 90% by weight of at least one non-functionalized olefin polymer, more than preferably up to 5 times, that is to say by adding up to at 80% by weight of at least one non-functionalized olefin polymer.
• the dilution of the composition can take place continuously in the screw extruder in which the preparation of the stabilized composition takes place. It can also take place in a device separate from said extruder, for example in a second extruder, optionally after granulation of the stabilized composition.
• the order of introduction of the reagents is not critical.
• the functionalizing agent, the stabilizing agent and the radical initiator can be introduced at the same time or independently in any order and optionally in a fractional manner.
• the stabilizing agent is preferably introduced after the functionalizing agent and the radical initiator, particularly preferably after the reaction zone.
• the process for the preparation of stabilized compositions according to the invention comprises the following stages: a) feeding, under a nitrogen atmosphere, of one or more olefin polymers and from 0.001 to 20 % by weight, of functionalizing agent, in a co-rotating twin screw extruder, equipped with a series of mixing elements associated with left steps, b) feeding from 0.0001 to 1% by weight of a radical initiator, optionally diluted in one or more olefin polymers or optionally introduced by spraying, c) mixture of one or more molten olefin polymers, the functionalizing agent and the radical initiator in the extruder for a sufficient time to graft at least part of the functionalizing agent on the molten olefin polymer (s), d) feeding in the extruder from 0.001 to 1% by weight, d stabilizer and vent uly of one or more other additives, optionally diluted in one or more olefin polymers, e)
• a screw extruder in the sense of the present invention comprises at least the following parts: a feed zone, a reaction zone and, at its exit, a discharge zone preceded by a compression zone, the latter forcing the melt to pass through the evacuation zone.
• all the stages can be carried out in a co-rotating or counter-rotating screw, single or twin screw extruder, which generally includes, in addition to the zones mentioned above, optionally one or more devices for 'delayed feed for the separate introduction of the polyolefin (s), functionalizing agents, free-radical initiator and / or stabilizing agent, one or more screw elements allowing the propagation of the material to be extruded, a or several heating zones allowing the melting of the constituents and one or several devolatilization zones.
• the composition can be further diluted in a zone allowing the introduction of non-functionalized polyolefin by an appropriate feeding device.
• the evacuation zone can also be followed by a granulation device.
• the process according to the invention is advantageously used for the preparation of the compositions according to the invention.
• compositions according to the present invention for compatibilizing olefin polymers with polymers, fillers and metal substrates which are incompatible with the olefin polymers.
• Incompatible polymers are for example epoxy resins, fluorinated resins and particularly poly (vinylidene fluoride), polyamides and polyesters.
• compositions according to the invention are used to compatibilize the olefin polymers with the epoxy resins.
• Incompatible fillers are for example natural fibers, such as flax, hemp, jute and cellulose, as well as glass fibers, glass, silica, talc, calcium carbonate and carbon black .
• Metal substrates are for example steel or aluminum.
• compositions according to the invention are multilayer adhesion and multilayer coating of steel tubes.
• the polyolefin melt index (MI5) is determined at 190 ° C under a load of 5 kg, 8/2 mm die according to ISO 1133 (1991).
• the grafted AM content is evaluated by IR spectroscopy. Two films are produced per sample and analyzed directly after pressing and then after degassing for 1 hour at 120 ° C under vacuum in order to remove, if necessary, the residual free anhydride.
• the level of AM, measured by IR is expressed by the ratio between the absorbance of carbonyl (1785 cm ⁇ 1) and the absorbance at 3610 cm ⁇ 1, characteristic of PE.
• the acid level is expressed by the ratio between the absorbance at 1715 cm "! and absorbance at 3610 cm ⁇ l.
• the values obtained are converted into% by weight of grafted maleic anhydride using a relationship based on a titrimetric calibration. Free maleic anhydride is detected by the characteristic bands at 895, 840 and / or 700 cm "'.
• the thermal stability is determined by measuring the induction period under oxygen at 210 ° C. according to standard ASTM D 3895 (1992). The peel strength was assessed on three-ply
• the base resin is the polyethylene resin ELTEX® PEHD A 4090 P of MI5 29 dg / min and of standard density 952 kg / m ⁇ .
• Maleic anhydride (AM) is ground.
• the peroxide is 2,5-dimethyl-2,5-di (t-butylperoxy) hexane (DHBP-PEROXYD CHEMIE). After grafting, the products are dried in an oven at 80 ° C, under vacuum for 16 h to remove the free AM.
• Example 1 A sample of ELTEX® A 4090 P polyethylene functionalized with maleic anhydride in the absence of any stabilizer, containing 1% of anhydride maleic grafted and having a fluidity index of 6.6 dg / min before and after hydrolysis, is mixed on a BRABENDER® mixer at 180 ° C, 50 rotations per minute, for 6 min, in the presence of 3 g / kg of stabilizer 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybe-nzyl) benzene (stabilizer A).
• Half of the sample is hydrolyzed in the presence of steam for 7 days at 100 ° C and then dried under vacuum overnight at 85 ° C.
• the procedure is the same as in Example 1 except that the stabilizer used is the stabilizer pentaerythrityl tetrakis- (3,5-di-t-butyl-4-hydroxyphenylpropionate) (stabilizer B).
• the stabilizer used is the stabilizer pentaerythrityl tetrakis- (3,5-di-t-butyl-4-hydroxyphenylpropionate) (stabilizer B).
• HDPE linear high density polyethylene
• ELTEX® A 4090 P maleic anhydride in the solid state, at a content of 0.4% by weight, is fed into a double extruder Krupp Werner & Pfleiderer ZSK58 co-rotating screw.
• the extruder is arranged so that it successively includes the following zones:
• HDPE mixed with maleic anhydride
• the peroxide is fed into the main hopper at the feed zone at a content of 0.045% by weight, in the form of a master mixture with HDPE.
• the stabilizer 1,3,5-trimethyl-2,4,6-tris (3,5-t-butyl-4-hydroxyphenyl) benzene (Stabilizer A) is added to zone 3 at a content of 0.3% in weight, in a 10-fold HDPE / stabilizer masterbatch.
• the functionalized polyethylene contains 0.5% by weight of maleic anhydride and has a MI5 melt flow index of 20 dg / min as well as a thermal stability of 20 min.
• compositions according to the invention offer better long-term adhesion.

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• Compositions Of Macromolecular Compounds (AREA)
• Paints Or Removers (AREA)
• Adhesives Or Adhesive Processes (AREA)
• Laminated Bodies (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

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• 1999
  • 1999-04-29 BE BE9900310A patent/BE1012638A3/fr not_active IP Right Cessation
• 2000
  • 2000-04-25 JP JP2000615669A patent/JP2002543252A/ja not_active Abandoned
  • 2000-04-25 RU RU2001132146/04A patent/RU2235742C2/ru not_active IP Right Cessation
  • 2000-04-25 EP EP00934964A patent/EP1177230B1/fr not_active Expired - Lifetime
  • 2000-04-25 PL PL00351616A patent/PL351616A1/xx not_active IP Right Cessation
  • 2000-04-25 EP EP06075109A patent/EP1659138A3/fr not_active Withdrawn
  • 2000-04-25 CN CN00809613A patent/CN1358205A/zh active Pending
  • 2000-04-25 CA CA002371616A patent/CA2371616A1/fr not_active Abandoned
  • 2000-04-25 AU AU50631/00A patent/AU778639B2/en not_active Ceased
  • 2000-04-25 KR KR1020017013777A patent/KR100700328B1/ko not_active Expired - Fee Related
  • 2000-04-25 BR BR0010086-2A patent/BR0010086A/pt active Search and Examination
  • 2000-04-25 CZ CZ20013882A patent/CZ20013882A3/cs unknown
  • 2000-04-25 ES ES00934964T patent/ES2269148T3/es not_active Expired - Lifetime
  • 2000-04-25 WO PCT/EP2000/003734 patent/WO2000066642A1/fr not_active Ceased
  • 2000-04-25 US US09/926,414 patent/US6777473B1/en not_active Expired - Fee Related
  • 2000-04-25 AT AT00934964T patent/ATE329947T1/de not_active IP Right Cessation
  • 2000-04-25 DE DE60028757T patent/DE60028757T2/de not_active Expired - Fee Related
  • 2000-04-26 GC GCP2000635 patent/GC0000335A/en active
  • 2000-04-28 AR ARP000102072A patent/AR023812A1/es active IP Right Grant
  • 2000-04-29 EG EG20000552A patent/EG22668A/xx active

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