FR3003506A1 - MULTILAYER LAMINATE FOR PNEUMATIC - Google Patents

Abstract

Waterproof elastomeric laminate for a tire, said laminate comprising at least two superposed layers of elastomer: a first layer, consisting of a composition based on at least one thermoplastic elastomer with polystyrene and polyisobutylene blocks, the thermoplastic elastomer content at polystyrene and polyisobutylene blocks being in a range from more than 50 to 100 phr (parts by weight per 100 parts by weight of elastomer), and a plasticizer system comprising 1 to 40 phr of a plasticizing oil and 1 to 40 phr of a hydrocarbon resin, the total content of plasticizer being in a range from 2 to 70 phr; A second layer, consisting of a composition based on at least one diene elastomer, the content of diene elastomer being in a range from more than 50 to 95 phr, and at least one thermoplastic styrene elastomer ( TPS), the styrene thermoplastic elastomer content being in a range from 5 to less than 50 phr.

Description

The present invention relates to laminates for tires comprising a sealed composition whose elastomers are predominantly thermoplastic elastomers polystyrene blocks and polyisobutylene in one of their elastomeric layers. In a conventional tire the various elastomeric layers consist of diene elastomer compositions, adhering to each other by the bonds created during the crosslinking of said elastomers. These layers must be associated before baking (or crosslinking) to allow their adhesion. [0003] It is of interest today for tire manufacturers to use sealed elastomeric layers comprising, as elastomers, predominantly thermoplastic elastomers with polystyrene and polyisobutylene blocks in order to benefit from the properties of these elastomers. , in particular for sealing, reduction of rolling resistance and ease of implementation. [0004] The difficulty of using such layers, whose elastomers are mainly styrenic thermoplastic elastomers (TPS), in particular the polystyrene and polyisobutylene block copolymers, is their adhesion to the adjacent diene layers of conventional composition, and this before firing the resulting laminate or after firing the layer adjacent to the layer whose elastomers are predominantly polystyrene and polyisobutylene block copolymers. In order to improve this adhesion, the applicants have previously described laminates for tires comprising a layer whose elastomers are predominantly thermoplastic elastomers with polystyrene and polyisobutylene blocks, for example in the document WO2010 / 063427. In this document, the layer 25 consisting mainly of polystyrene and polyisobutylene block copolymers can adhere to a diene layer by the presence of an intermediate specific adhesive layer. If effective, the resulting laminate adds an additional layer to the tire structure, which adds weight and adds a step in its manufacture. [0006] With the aim of improving conventional tires by the use of a mainly waterproof layer based on a thermoplastic block-2-polystyrene and polyisobutylene elastomer, while simplifying the adhesion of such a layer. to an adjacent diene layer, crosslinked or uncrosslinked, the Applicant has surprisingly found the laminate of the invention. The invention therefore relates to a waterproof elastomeric laminate for a tire, said laminate comprising at least two adjacent layers of elastomer: a first layer, consisting of a composition based on at least one thermoplastic elastomer to polystyrene and polyisobutylene blocks, the content of thermoplastic elastomer with polystyrene and polyisobutylene blocks being in a range from more than 50 to 100 phr (parts by weight per 100 parts by weight of elastomer), and a plasticizer system comprising 1 to 40 phr of a plasticizing oil and 1 to 40 phr of a hydrocarbon resin, the total plasticizer content being in a range from 2 to 70 phr; a second layer, consisting of a composition based on at least one diene elastomer, the content of diene elastomer being in a range from more than 50 to 95 phr, and at least one thermoplastic styrene elastomer; (TPS), the styrene thermoplastic elastomer content being in a range from 5 to less than 50 phr. The presence, in the two layers of thermoplastic styrene elastomer (TPS), of which the polystyrene and polyisobutylene block copolymer in the sealed layer, makes it possible to have a satisfactory adhesion between the two layers of the waterproof laminate of the invention. Compared with the solutions of the prior art, the invention is very simple since it makes it possible to dispense with an intermediate layer whose sole function would be the adhesion of the waterproof layer comprising the polystyrene block copolymer. and polyisobutylene on the diene layer and thus not to weigh down the tire and therefore not to increase its rolling resistance. Another major advantage of the invention is to allow a saving of materials since instead of using an additional elastomeric layer for adhesion, the invention allows a predominantly diene layer (such as tire compositions conventional) to adhere to a waterproof layer comprising a polystyrene and polyisobutylene block copolymer. This economy is also very favorable to the preservation of the environment. In addition, the formulation of the layers of this laminate allows a post-firing fabrication, that is to say an application of the first layer of the laminate on the second layer after firing thereof. For example, the first layer may be applied to the second layer after firing a tire provided with said second layer as a radially inner layer of the tire; in particular, this application of the first layer is possible without any treatment being necessary on the second layer. [0011] Preferably, the invention relates to a laminate as defined above, in which the polystyrene and polyisobutylene block copolymer of the first layer is a styrene / isobutylene / styrene copolymer (SIBS). Also preferably, the invention relates to a laminate as defined above, in which the level of thermoplastic elastomer with polystyrene and polyisobutylene blocks in the composition of the first layer is in a range from 70 to 100. pce; more preferably, from 80 to 100 phr. [0013] Preferably, the invention relates to a laminate as defined above, in which the thermoplastic elastomer is the only elastomer of the first layer. Preferably, the invention relates to a laminate as defined above, wherein the plasticizing system of the first layer comprises from 2 to 30 phr, and preferably from 5 to 20 phr of a plasticizing oil. [0015] Also preferably, the invention relates to a laminate as defined above, wherein the plasticizing oil of the first layer is selected from the group consisting of polyolefinic oils, paraffinic oils, naphthenic oils aromatic oils, mineral oils and mixtures of these oils. Preferably, the plasticizing oil of the first layer is a polybutene oil, and preferably a polyisobutylene oil. Preferably, the invention relates to a laminate as defined above, wherein the plasticizing system of the first layer comprises from 2 to 30 phr, and preferably from 5 to 20 phr of hydrocarbon resin. Preferably, the invention relates to a laminate as defined above, in which the hydrocarbon resin of the first layer is chosen from the group consisting of homopolymer resins or copolymers of cyclopentadiene or dicyclopentadiene. terpene homopolymer or copolymer resins, terpene phenol homopolymer or copolymer resins, homopolymer or C5 cut copolymer resins, homopolymer or C9 cut copolymer resins, homopolymer or copolymer resins, and the like. alpha-methyl-styrene and mixtures of these resins. Preferably, the hydrocarbon resin of the first layer is chosen from the group consisting of the copolymer resins of two different vinylaromatic monomers, (D) CPD / vinylaromatic, the copolymer resins (D) CPD / terpene, the copolymer resins (D). ) CPD / C5 cut, (D) CPD / C5 cut copolymer resins, (D) CPD / C9 cut copolymer resins, terpene / vinylaromatic copolymer resins, terpene / phenol copolymer resins, copolymer resins C5 / vinylaromatic cut, and mixtures of these resins. More preferably, the hydrocarbon resin of the first layer is chosen from the group consisting of homopolymer resins (D) CPD, copolymer resins (D) CPD / styrene, polylimonene resins, limonene / styrene copolymer resins , limonene / D (CPD) copolymer resins, C5 / styrene cut copolymer resins, C5 / C9 cut copolymer resin resins, styrene / alphamethylstyrene copolymer resins, and mixtures of these resins. Very preferably, the hydrocarbon resin of the first layer is a styrene / alphamethylstyrene copolymer resin. Preferably, the invention relates to a laminate as defined above, wherein the total plasticizer content is in a range from 5 to 45 phr. Preferably, the total amount of plasticizer is in a range from 10 to 35 phr. [0019] Preferably also, the invention relates to a laminate as defined above, wherein the first layer further comprises a lamellar filler. Preferably, the invention relates to a laminate as defined above, wherein the first layer does not contain a crosslinking system. [0021] Preferably, the invention relates to a laminate as defined above, in which the elastomer blocks of the styrenic thermoplastic elastomers (TPS) of the second layer are chosen from elastomers having a glass transition temperature less than 25 ° C. [0022] Also preferentially, the invention relates to a laminate as defined above, in which the elastomer blocks of the styrenic thermoplastic elastomers (TPS) of the second layer are selected from the group consisting of ethylenic elastomers. diene elastomers and mixtures thereof. According to a preferred embodiment, the elastomeric blocks of the styrenic thermoplastic elastomers (TPS) of the second layer are chosen from ethylenic elastomers. According to another preferred embodiment, the elastomeric blocks of the styrenic thermoplastic elastomers (TPS) of the second layer are chosen from diene elastomers. Preferably, the invention relates to a laminate as defined above, wherein the styrenic thermoplastic elastomers (TPS) of the second layer comprise between 5 and 50% by weight of styrene. More preferably, the styrenic thermoplastic elastomers (TPS) of the second layer are chosen from the group consisting of thermoplastic copolymer elastomers styrene / ethylene / butylene (SEB), styrene / ethylene / propylene (SEP), styrene / ethylene / ethylene / propylene (SEEP), styrene / ethylene / butylene / styrene (SEBS), styrene / ethylene / propylene / styrene (SEPS), styrene / ethylene / ethylene / propylene / styrene (SEEPS), styrene / isobutylene (SIB), styrene / isobutylene / styrene (SIBS), styrene / butadiene (SB), styrene / isoprene (SI), styrene / butadiene / isoprene (SBI), styrene / butadiene / styrene (SBS), styrene / isoprene / styrene (SIS), styrene / butadiene / isoprene / styrene (SBIS), styrene / butadiene / butylene (SBB), styrene / butadiene / butylene / styrene (SBBS) and mixtures of these copolymers. Preferably, the invention relates to a laminate as defined above, wherein the content of thermoplastic styrene elastomer (TPS) in the composition of the second layer is in a range from 5 to 45 phr, and more preferably, from 10 to 40 phr. Preferably, the invention relates to a laminate as defined above, wherein the diene elastomer of the second layer is selected from the group consisting of essentially unsaturated diene elastomers, and mixtures of these elastomers. Preferably, the diene elastomer of the second layer is chosen from the group consisting of homopolymers obtained by polymerization of a conjugated diene monomer having from 4 to 12 carbon atoms, the copolymers obtained by copolymerization of one or more conjugated dienes between them or with one or more aromatic vinyl compounds having 8 to 20 carbon atoms, and mixtures thereof. More preferably, the diene elastomer of the second layer is selected from the group consisting of polybutadienes, synthetic polyisoprenes, natural rubber, butadiene copolymers, isoprene copolymers and mixtures of these elastomers. Preferably, the invention relates to a laminate as defined above, wherein the second layer comprises a reinforcing filler. Preferably, the reinforcing filler of the second layer is carbon black and / or silica. More preferably, the majority reinforcing filler of the second layer is a carbon black. The invention also relates to a tire comprising a laminate as defined above. In addition, the invention also relates to the use in a pneumatic object of a laminate as defined above. The invention relates more particularly to laminates as defined above, used in tires intended to equip non-motorized vehicles such as bicycles, or tourism-type motor vehicles, SUV ("Sport Utility Vehicles"). ), two-wheelers (including motorcycles), airplanes, as industrial vehicles selected from light trucks, "heavy goods vehicles" - that is, metros, buses, road transport vehicles (trucks, tractors, trailers), off-road vehicles -the-road such as agricultural or civil engineering - other transport or handling vehicles. The invention as well as its advantages will be readily understood in light of the description and the following exemplary embodiments.

DETAILED DESCRIPTION OF THE INVENTION [0031] In the present description, unless expressly indicated otherwise, all the percentages (%) indicated are percentages by mass. Furthermore, the term "phr" (phr) means within the meaning of the present patent application, part by weight per hundred parts of elastomer, thermoplastic and diene combined. For the purposes of the present invention, thermoplastic styrene elastomers (TPS) are part of the elastomers. On the other hand, any range of values designated by the expression "between a and b" represents the range of values from more than a to less than b (i.e. terminals a and b). excluded) while any range of values designated by the term "from a to b" means the range from a to b (i.e., including strict bounds a and b). For the purposes of the present invention, it is specified that in the present patent application, the term "thermoplastic layer" an elastomeric layer comprising, by weight, a larger amount of thermoplastic elastomer (s) than 10 diene elastomer (s); and denominated "diene layer" an elastomeric layer comprising, by weight, a larger amount of diene elastomer (s) than thermoplastic elastomer (s). The waterproof layer of the laminate according to the invention, comprising predominantly a polystyrene and polyisobutylene block copolymer TPS, is a thermoplastic layer as defined above. The laminate according to the invention has excellent adhesion between the two layers, referred to for the sake of clarity of the invention first and second layers (or respectively, sealed thermoplastic layer and diene layer). Thus, according to the invention, the sealed thermoplastic layer as defined above can adhere with a diene layer as defined above, thanks to the presence of a certain amount of TPS in this diene layer. The details of the invention will be explained below, by the description in a first step, the possible common components of the two layers of the laminate of the invention and, in a second step, by the description of the specific elements of the invention. each of the layers of the laminate of the invention, and finally by the description of the adhesion between the two layers of the laminate according to the invention. The sealed laminate according to the invention has the essential feature of being provided with at least two elastomeric layers called "sealed thermoplastic layer" and "diene layer" of different formulations, said layers of said laminate comprising at least one thermoplastic elastomer styrene (TPS) as defined hereinafter, including the polystyrene and polyisobutylene block copolymer in the sealing layer. In addition to the polystyrene and polyisobutylene block copolymer, the waterproof layer comprises a plasticizer system whose composition will be detailed hereinafter. In addition to the styrenic thermoplastic elastomer (TPS), the diene layer also comprises a diene elastomer, its composition will be detailed in the following.

I- Composition of the waterproof layer of the laminate of the invention I-1. Thermoplastic Elastomer with Polystyrene and Polyisobutylene Blocks The first layer, airtight or more generally any inflation gas, comprises more than 50 phr of a polystyrene and polyisobutylene block copolymer TPS. By "polystyrene and polyisobutylene block copolymer" is meant in the present application any styrenic thermoplastic copolymer comprising at least one polystyrene block (i.e. one or more polystyrene blocks) and at least one polyisobutylene block ( that is to say one or more polyisobutylene blocks), which may or may not be associated with other saturated or non-saturated blocks (for example polyethylene and / or polypropylene) and / or other monomer units. Since the polystyrene and polyisobutylene block copolymers comprise a polystyrene block, they form part of the larger family of thermoplastic styrene elastomers (TPS) as detailed below in the part describing the composition of the diene layer of the laminate of the invention. . By block polystyrene, should be understood in the present description any block resulting from the polymerization of one or more monomers based on styrene, unsubstituted as substituted; among the substituted styrenes may be mentioned, for example, methylstyrenes (for example α-methylstyrene, (3-methylstyrene, p-methylstyrene, tert-butylstyrene), chlorostyrenes (for example monochlorostyrene, dichlorostyrene) or bromostyrenes [0040]. the presence of this polystyrene and polyisobutylene block copolymer, such as in particular styrene / isobutylene diblock copolymers (abbreviated as "SIB"), styrene / isobutylene / styrene triblock copolymers (abbreviated as "SIBS"), provides the laminate with excellent sealing properties while substantially reducing the hysteresis compared to conventional butyl rubber layers. This polystyrene and polyisobutylene block copolymer is in particular selected from the group consisting of SIBs, SIBS and the mixtures of these SIB and SIBS copolymers, by definition fully saturated. [0042] Polystyr block copolymers eene and polyisobutylene such as SIB or SIBS are known and commercially available, sold for example by KANEKA under the name "SIBSTAR" (e.g. "Sibstar 103T", "Sibstar 102T", "Sibstar 073T" or "Sibstar 072T" for SIBS; "Sibstar 042D" for SIBs). For example, they have been described, as well as their synthesis, in patent documents EP 731 112, US 4 946 899 and US 5 260 383. They were developed first of all for biomedical applications and then described in various applications specific to TPS elastomers, as varied as medical equipment, parts for automobiles or household appliances, sleeves for electrical wires, sealing pieces or elastics (see, for example, EP 1 431 343, EP 1 561 783, EP 1 566 405, WO 2005/103146). ). Pneumatic application is described in WO2,009 / 007064 and WO2010 / 063427. The gas-tight layer described above could optionally comprise other elastomers than the polystyrene and polyisobutylene block copolymer, in a minor amount (less than 50 phr). Such complementary elastomers could be, for example, diene elastomers as defined below for the diene layer of the laminate of the invention, for example natural rubber or synthetic polyisoprene, butyl rubber or even other thermoplastic elastomers. saturated styrenics, within the limits of the compatibility of their microstructures. In such a case and preferably, the content of polystyrene and polyisobutylene block copolymer in the first sealed composition is in a range from 70 to 100 phr, in particular in a range from 80 to 100 phr. [0044] However, according to a particularly preferred embodiment, the polystyrene and polyisobutylene block copolymer, in particular SIB or SIBS, is the only thermoplastic elastomer, and more generally the only elastomer present in the gas-tight layer; accordingly, in such a case, its rate is equal to 100 phr. The above-described polystyrene and polyisobutylene block copolymer, in particular SIB or SIBS, is sufficient on its own to fill, in the first elastomeric layer, the gas-tightness function with pneumatic objects in which they are used. I-2. Plasticizer System [0046] The plasticizer system of the waterproof layer of the laminate of the invention is composed of a plasticizing oil and a hydrocarbon resin. The function of the plasticizer system is to facilitate the implementation, particularly the integration into a pneumatic object by a lowering of the viscosity and an increase in the tackifying power of the gas-tight layer and therefore the laminate of the invention. . This plasticizer system comprises a plasticizing oil and a hydrocarbon resin, the total plasticizer content being in a range from 2 to 70 phr, preferably from 5 to 45 phr and more preferably from 10 to 35 phr. For the purposes of the present invention, the plasticizers, that is to say the oil and the resin are preferably compatible with the thermoplastic elastomer block polystyrene and polyisobutylene. By plasticizer compatible with the thermoplastic elastomer block polystyrene and polyisobutylene is meant a plasticizer (oil or resin depending on the plasticizer considered) which, in mixture with the thermoplastic elastomer block polystyrene and polyisobutylene, a single glass transition temperature (Tg) for the elastomeric part of the mixture. Said compatibility of the plasticizers with the thermoplastic elastomer with polystyrene and polyisobutylene blocks allows an optimal effect of the plasticizers. The plasticizing oil (or extension oil) is used at a rate ranging from 1 to 40 phr, ie parts by weight per hundred parts of total elastomer (ie, polystyrene and polyisobutylene block copolymer above). more complementary elastomer if present) present in the first waterproof layer. Below the minimum indicated, the gas-tight layer and thus the multilayer laminate may have a viscosity too high to be deposited on the diene layer after baking thereof, and penetrate into the crevices of the diene layer, while beyond the maximum recommended, it is exposed to excessive cold flow likely to cause unwanted material movements by centrifugation during the rotation of the tire. For these reasons, it is preferred that the extender oil be used at a level ranging from 2 to 30 phr and more preferably from 5 to 20 phr. Any extension oil, preferably of a slightly polar nature, capable of extending and plasticizing elastomers, in particular thermoplastics, may be used. At room temperature (23 ° C), these oils, more or less viscous, are liquids (that is to say, as a reminder, substances having the ability to eventually take the form of their container) , in contrast to resins that are inherently solid. Preferably, the extender oil is chosen from the group consisting of polyolefinic oils (that is to say derived from the polymerization of olefins, monoolefins or diolefins), paraffinic oils, oils and the like. naphthenic (low or high viscosity), aromatic oils, mineral oils and mixtures of these oils. Polybutene oils, particularly polyisobutylene oils (abbreviated to "PIB"), which have demonstrated the best compromise of properties compared with the other oils tested, in particular oils of the paraffinic type, are preferably used. By way of example, polyisobutylene oils are sold in particular by the company UNIVAR under the name "Dynapak Poly" (eg "Dynapak Poly 190"), by BASF under the names "Glissopal" (eg "Glissopal 1000") or "Oppanol" (eg "Oppanol B12"), by INEOS Oligomer under the name "Indopol H1200". Paraffinic oils are commercially available, for example, from Exxon under the name "Telura 618" or from Repsol under the name "Extensol 51". The number-average molecular mass (Mn) of the extender oil is preferably between 200 and 25,000 g / mol, more preferably between 300 and 10,000 g / mol. For masses Mn too low, there is a risk of oil migration outside the composition, while too high masses can lead to excessive stiffening of this composition. A mass Mn of between 350 and 4000 g / mol, in particular between 400 and 3000 g / mol, has proved to be an excellent compromise for the intended applications, in particular for use in a tire. The number average molecular weight (Mn) of the extender oil is determined by SEC, the sample being solubilized beforehand in tetrahydrofuran at a concentration of about 1 g / l; then the solution is filtered on 0.451.1m porosity filter before injection. The equipment is the chromatographic chain "WATERS alliance". The elution solvent is tetrahydrofuran, the flow rate is 1 ml / min, the temperature of the system is 35 ° C and the analysis time is 30 min. We use a set of two columns "WATERS" of denomination "STYRAGEL HT6E". The injected volume of the solution of the polymer sample is 100 μl. The detector is a differential refractometer "WATERS 2410" and its associated software for the exploitation of chromatographic data is the system 10 "WATERS MILLENIUM". The calculated average molar masses relate to a calibration curve made with polystyrene standards. Those skilled in the art will know, in the light of the description and examples of embodiment which follow, adjust the amount of extension oil depending on the particular conditions of use of the gas-tight thermoplastic layer, in particular of the pneumatic object in which it is intended to be used. Also the plasticizer system of the first layer of the laminate of the invention comprises a hydrocarbon resin. The term "resin" is reserved in the present application, by definition known to those skilled in the art, to a compound which is solid at room temperature (23 ° C.), as opposed to a liquid plasticizer such as an oil. Hydrocarbon resins are polymers well known to those skilled in the art, essentially based on carbon and hydrogen, which can be used in particular as plasticizers in polymer matrices. They have been described, for example, in the book "Hydrocarbon Resins" by R. Mildenberg, M. Zander and G. Collin (New York, VCH, 1997, ISBN 3-527-28617-9), of which Chapter 5 is dedicated to their applications, in particular pneumatic rubber (5.5 Rubber Tires and Mechanical Goods). They can be aliphatic, cycloaliphatic, aromatic, hydrogenated aromatic, aliphatic / aromatic type that is to say based on aliphatic and / or aromatic monomers. They may be natural or synthetic, whether based on petroleum or not (if so, also known as petroleum resins). They are inherently miscible (i.e., compatible) with the levels used with the polymer compositions for which they are intended, so as to act as true diluents. Their Tg is preferably greater than 0 ° C., especially greater than 20 ° C. (most often between 30 ° C. and 120 ° C.). In known manner, these hydrocarbon resins can also be called thermoplastic resins in that they soften by heating and can be molded. They can also be defined by a point or softening point ("softening point"), the temperature at which the product, for example in the form of powder, agglutinates. The softening temperature of a hydrocarbon resin is generally greater by about 50 to 60 ° C. than its Tg value. [0064] In the plasticizer system, the resin is used at a weight content ranging from 1 to 40 phr. Below 1 phr, the effect of the resin is not very remarkable, whereas beyond 40 phr, there is a simultaneous increase in hysteresis. For these reasons, the level of resin is preferably from 2 to 30 phr and very preferably from 5 to 20 phr. According to a preferred embodiment of the invention, the hydrocarbon resin 15 has at least one, more preferably all of the following characteristics: a Tg greater than 10 ° C., and more preferably greater than 30 ° C. ; a softening point greater than 50 ° C., preferably greater than 80 ° C. (in particular between 80 ° C. and 160 ° C.); A number-average molar mass (Mn) of between 200 and 3000 g / mol; - a polymolecularity index (Ip) less than or equal to 4 (recall: Ip = Mw / Mn with Mw weight average molar mass). More preferably, this hydrocarbon resin has at least one, more preferably all of the following characteristics: a Tg between 30 ° C and 120 ° C (especially between 35 ° C and 105 ° C); a softening point greater than 90 ° C., in particular between 110 ° C. and 150 ° C .; an average mass M n of between 400 and 1500 g / mol; A polymolecularity index Ip of less than 3 and in particular less than 2. The softening point is measured according to the ISO 4625 standard ("Ring and Ball" method). Tg is measured according to ASTM D3418 (1999). The macrostructure (Mw, Mn and Ip) of the hydrocarbon resin is determined by steric exclusion chromatography (SEC): solvent tetrahydrofuran; temperature 35 ° C; concentration 1 g / 1; flow rate 1 ml / min; filtered solution on 0.45 μm porosity filter before injection; Moore calibration with polystyrene standards; set of 3 "WATERS" columns in series ("STYRAGEL" HR4E, HR1 and HR0.5); differential refractometer detection ("WATERS 2410") and its associated operating software ("WATERS EMPOWER"). Examples of such hydrocarbon resins include those selected from the group consisting of homopolymer resins or copolymer of cyclopentadiene (abbreviated CPD) or dicyclopentadiene (abbreviated DCPD), homopolymer resins or terpene copolymer, terpene phenol homopolymer or copolymer resins, C5 homopolymer or copolymer resins, C9 homopolymer or copolymer resins, alpha-methyl-styrene homopolymer or copolymer resins and mixtures of these resins. Among the copolymer resins mentioned above, mention may be made more particularly of those selected from the group consisting of copolymer resins of two different vinylaromatic monomers, (D) CPD / vinylaromatic, copolymer resins (D) CPD / terpene, copolymer resins (D) CPD / C5 cut, copolymer resins (D) CPD / C5 cut, copolymer resins (D) CPD / C9 cut, terpene / vinylaromatic copolymer resins, terpene / phenol copolymer resins , C5 / vinylaromatic cut copolymer resins, and mixtures of these resins. The term "terpene" here combines in a known manner the alpha-pinene, beta-pinene and limonene monomers; preferably, a limonene monomer is used which is present in a known manner in the form of three possible isomers: L-limonene (laevorotatory enantiomer), D-limonene (dextrorotatory enantiomer), or the dipentene, racemic of the dextrorotatory and levorotatory enantiomers. . Suitable vinylaromatic monomers are, for example, styrene, alpha-methylstyrene, ortho-methylstyrene, metamethylstyrene, para-methylstyrene, vinyl-toluene, para-tert-butylstyrene, methoxystyrenes, chlorostyrenes, hydroxystyrenes, vinylmesitylene, divinylbenzene, vinylnaphthalene, any vinylaromatic monomer resulting from a C9 cut (or more generally from a C8 to C10 cut). More particularly, mention may be made of the resins selected from the group consisting of homopolymer resins (D) CPD, CPD / styrene copolymer resins (D), polylimonene resins, limonene copolymer resins / styrene, limonene / D (CPD) copolymer resins, C5 / styrene cut copolymer resins, C5 / C9 cut copolymer resins, styrene / alphamethylstyrene copolymer resins, and mixtures of these resins. Most preferably, the resin is a styrene / alphamethylstyrene copolymer resin. All the above resins are well known to those skilled in the art and commercially available, for example sold by the company DRT under the name "Dercolyte" for polylimonene resins, by Neville Chemical Company. under the name "Super Nevtac", by Kolon under the name "Hikorez" or by the company Exxon Mobil under the name "Escorez" with regard to C5 / styrene resins or C5 / C9 cut resins by the company Struktol under the name "40 MS" or "40 NS" (mixtures of aromatic and / or aliphatic resins) by Eastman under the name "Eastotac", such as "Eastotac H-142W" with respect to aliphatic hydrocarbon resins hydrogenated, or by the company Arizona under the name "Sylvares SA 140" for styrene / alphamethylstyrene resins. I-3. Lamellar fillers The elastomers described above are sufficient on their own to make the multilayer laminate according to the invention usable, nevertheless a lamellar filler may be used in the composition of the waterproof layer of the laminate of the invention. The preferential use of lamellar filler advantageously makes it possible to lower the coefficient of permeability (thus increasing the seal) of the elastomer composition, without excessively increasing its modulus, which makes it possible to preserve the facility integrating the sealing layer in the pneumatic object. The so-called platy fillers are well known to those skilled in the art and have been used in particular in pneumatic tires to reduce the permeability of conventional gas-tight layers based on -16. Butyl rubber In these butyl-based layers, they are generally used at relatively low levels, usually not exceeding 10 to 15 phr (see, for example, US Patent Specification 2004/0194863, WO 2006/047509). [0075] They are generally in the form of plates, platelets, sheets or stacked sheets, with a more or less marked anisometry, their aspect ratio (F = L / E) is generally greater than 3, more often greater than 5 or 10, where L is the length (or greater dimension) and E is the average thickness of these lamellar fillers, these averages being calculated in number.Shape ratios of several tens or even hundreds The average length thereof is preferably greater than 1 μm (i.e., it is then said to be so-called micron-sized lamellar fillers), typically ranging from a few iam (for example 5 μm) to a few hundred. iam (for example 500 or 800 pm). Preferably, the lamellar fillers used in accordance with the invention are chosen from the group consisting of graphites, phyllosilicates and mixtures of such fillers. Among the phyllosilicates, there may be mentioned clays, talcs, micas, kaolins, these phyllosilicates may or may not be modified for example by a surface treatment; examples of such modified phyllosilicates include micas coated with titanium oxide, clays modified with surfactants ("organo clays"). Lamellar fillers with a low surface energy, that is to say relatively apolar, such as those chosen from the group consisting of graphites, talcs, micas and mixtures of such fillers, are preferably used. the latter may be modified or not, more preferably still in the group consisting of graphites, talcs and mixtures of such fillers. Among the graphites can be mentioned 25 natural graphites, expanded graphites or synthetic graphites. Examples of micas include micas marketed by the company CMMP (Mica-MU®, Mica-Soft®, Briomica® for example), vermiculites (including Shawatec® vermiculite marketed by CMMP or vermiculite Microlite ® marketed by WRGrace), modified or treated micas (e.g., the Iriodin® range marketed by Merck). As examples of graphites, mention may be made of the graphites marketed by Timcal (Timrex® range). As an example of talcs, mention may be made of talcs marketed by Luzenac. The lamellar charges described above are preferably used at a volume ratio preferably between 0% and 50%, more preferably between 1% and 50%, more preferably between 5 and 50%. According to a particular embodiment, the level of lamellar filler in the composition is preferably at least equal to 10% by volume of elastomer composition. Such a volume ratio typically corresponds, taking into account the average density of the lamellar charges used (typically between 2.0 and 3.0) and that of the TPS elastomers 10 used, at a weight ratio greater than 20 phr, preferably at least equal to 40 pce. To further increase the seal of the TPS elastomer layer, it is possible to use an even higher lamellar charge ratio, at least equal to 15% or even 20% by volume, which typically corresponds to at least one weight ratio. equal to 50 pce or 80 pce. Weight ratios higher than 100 phr are even advantageously possible. However, the level of lamellar filler is preferably less than 50% by volume (typically less than 500 phr), the upper limit from which it may be exposed to problems of increasing the modulus, weakening of the composition , difficulties of dispersion of the load and implementation, not to mention a possible penalty for hysteresis. [0083] The introduction of the lamellar fillers into the elastomeric thermoplastic composition can be carried out according to various known methods, for example by mixing in solution, by mass mixing in an internal mixer, or by extrusion mixing. 4-I. Various Additives The airtight layer or composition described above may further comprise the various additives usually present in the airtight layers known to those skilled in the art. For example, reinforcing fillers such as carbon black or silica, non-reinforcing or inert fillers other than the lamellar fillers described above, coloring agents that can be advantageously used for coloring the composition, protective agents such as antioxidants or antiozonants, anti-UV, various agents of implementation or other stabilizers, or promoters able to promote the adhesion to the rest of the structure of the pneumatic object. [0085] Preferably, the sealed thermoplastic layer of the multilayer laminate does not contain all these additives at the same time and preferably in some cases the multilayer laminate contains none of these agents. Also and optionally, the composition of the layers of the multilayer laminate of the invention may contain a crosslinking system known to those skilled in the art. Preferably, the composition does not contain a crosslinking system. In addition to the elastomers described above, the compositions of the multilayer laminate may also comprise, in a minority weight fraction relative to the block elastomer, one or more thermoplastic polymers (non-elastomeric), such as those based on polyether. . II-Composition of the Diene Layer of the Laminate of the Invention Styrenic Thermoplastic Elastomer (TPS) The second diene layer comprises a TPS, still in a minor fraction of its elastomers. The styrenic thermoplastic elastomers (abbreviated "TPS") are part, in known manner, of the family of thermoplastic elastomers (abbreviated "TPE"). Intermediate structure between thermoplastic polymers and elastomers, they consist of rigid polystyrene sequences connected by flexible elastomer sequences, for example polybutadiene, polyisoprene, poly (ethylene / butylene), or polyisobutylene. They are often triblock elastomers with two rigid segments connected by a flexible segment. The rigid and flexible segments may be linear, star or branched. Typically, each of these segments or blocks contains at least more than 5, usually more than 10 base units (e.g., styrene units and isoprene units for a styrene / isoprene / styrene block copolymer). By styrene, should be understood in the present description any monomer based on styrene, unsubstituted as substituted; examples of substituted styrenes are methylstyrenes (eg, α-methylstyrene, 13-methylstyrene, p-methylstyrene, tert-butylstyrene), chlorostyrenes (eg, monochlorostyrene, dichlorostyrene), bromostyrenes. The number-average molecular weight (denoted Mn) of the TPS elastomer is preferably between 30,000 and 500,000 g / mol, more preferably between 40,000 and 400,000 g / mol. Below the minimum indicated, the cohesion between the chains of the elastomer, especially due to the possible dilution of the latter by an extension oil, may be affected; on the other hand, an increase in the temperature of use may affect the mechanical properties, including the properties at break, resulting in reduced performance "hot". Moreover, a 1 () mass Mn too high can be penalizing for the flexibility of the gas-tight layer. Thus, it has been found that a value within a range of 50,000 to 300,000 g / mol is particularly well suited, in particular to a use of the composition in a tire. The number-average molecular weight (Mn) of the TPS elastomer is determined in known manner by steric exclusion chromatography (SEC). The sample is first solubilized in tetrahydrofuran at a concentration of about 1 g / l; then the solution is filtered on a porosity filter 0.45 i.tm before injection. The equipment used is a chromatographic chain "WATERS alliance". The eluting solvent is tetrahydrofuran, the flow rate is 0.7 ml / min, the system temperature is 35 ° C and the analysis time is 90 min. A set of four WATERS columns in series, of trade names "STYRAGEL" ("HMW7", "HIMW6E" and two "HT6E") is used. The injected volume of the solution of the polymer sample is 100 μl. The detector is a differential refractometer "WATERS 2410" and its associated software for the exploitation of chromatographic data is the "WATERS MILLENIUM" system. The calculated average molar masses relate to a calibration curve made with polystyrene standards. The polydispersity index Ip (booster: Ip = Mw / Mn with Mw weight average molecular weight) of the TPS elastomer is preferably less than 3; more preferably Ip is less than 2. [0094] According to a preferred embodiment of the invention, the weight content of styrene in the TPS elastomer is between 5% and 50%. Below the minimum indicated, the thermoplastic nature of the elastomer may decrease appreciably while above the recommended maximum, the elasticity of the sealing layer may be affected. For these reasons, the styrene content is more preferably between 10% and 40%, in particular between 15 and 35%. The elastomeric blocks of the TPE for the purposes of the invention may be all the elastomers known to those skilled in the art. They generally have a Tg less than 25 ° C, preferably less than 10 ° C, more preferably less than 0 ° C and very preferably less than -10 ° C. Also preferably, the TPE block elastomer block is greater than -100 ° C. For the elastomeric blocks with a carbon chain, if the elastomer portion of the TPE does not contain ethylenic unsaturation, we will speak of a saturated elastomer block. If the elastomeric block of the TPE comprises ethylenic unsaturations (that is to say carbon-carbon double bonds), then we will speak of an unsaturated or diene elastomer block. A saturated elastomer block consists of a polymer block obtained by the polymerization of at least one (that is to say one or more) ethylenic monomer, that is to say comprising a double bond carbon - carbon. Among the blocks derived from these ethylenic monomers, mention may be made of polyalkylene blocks, such as polyisobutylene, polybutylene, polyethylene or polypropylene blocks, or else such as ethylene-propylene or ethylene-butylene random copolymers. These saturated elastomeric blocks can also be obtained by hydrogenation of unsaturated elastomeric blocks. It may also be aliphatic blocks from the family of polyethers, polyesters, or polycarbonates. In the case of saturated elastomer blocks, this elastomeric block of the TPE is preferably composed mainly of ethylenic units. By a majority, is meant a weight ratio of ethylenic monomer highest relative to the total weight of the elastomeric block, and preferably a weight of more than 50%, more preferably more than 75% and even more preferably more than 85%. %. C4 -C14 conjugated dienes may be copolymerized with the ethylenic monomers. In this case, it is a question of random copolymers. Preferably, these conjugated dienes are selected from isoprene, butadiene, 1-methylbutadiene, 2-methylbutadiene, 2,3-dimethyl-1,3-butadiene, 2,4-dimethyl-1,3 1,3-butadiene, 1,3-pentadiene, 2-methyl-1,3-pentadiene, 3-methyl-1,3-pentadiene, 4-methyl-1,3-pentadiene, 2,3-methyl-1,3-pentadiene, dimethyl-1,3-pentadiene, 1,3-hexadiene, 2-methyl-1,3-hexadiene, 3-methyl-1,3-hexadienene, 4-methyl-1,3-hexadiene, 5-methyl-1,3 hexadiene, 2,3-dimethyl-1,3-hexadiene, 2,4-dimethyl-1,3-hexadiene, 2,5-dimethyl-1,3-hexadiene; ethene, 2-neopentylbutadiene, 1,3-cyclohexadiene, 1,3-cyclohexadienene, 1-vinyl-1,3-cyclohexadiene or a mixture thereof. More preferentially, the conjugated diene is chosen from butadiene or isoprene or a mixture containing butadiene and isoprene. In the case of unsaturated elastomer blocks, this elastomeric block of the TPE is preferably composed mainly of a diene elastomer part. By a majority, is meant a weight ratio of the highest diene monomer relative to the total weight of the elastomer block, and preferably a weight content of more than 50%, more preferably of more than 75% and even more preferably of more than 85%. %. Alternatively, the unsaturation of the unsaturated elastomer block can come from a monomer comprising a double bond and a cyclic unsaturation, this is the case for example in polynorbornene. Preferably, conjugated C4-C14 dienes may be polymerized or copolymerized to form a diene elastomer block. Preferably, these conjugated dienes are chosen from isoprene, butadiene, piperylene, 1-methylbutadiene, 2-methylbutadiene, 2,3-dimethyl-1,3-butadiene and 2,4-dimethyl-1 3-butadiene, 1,3-pentadiene, 2-methyl-1,3-pentadiene, 3-methyl-1,3-pentadiene, 4-methyl-1,3-pentadiene, 2,3-pentadiene, 1,3-dimethyl-pentadiene, 2,5-dimethyl-1,3-pentadiene, 2-methyl-1,4-pentadiene, 1,3-hexadiene, 2-methyl-1,3-hexadiene, 2-methyl-1,5-hexadiene, 3-methyl-1,3-hexadiene, 4-methyl-1,3-hexadiene, 5-methyl-1,3-hexadiene, 2,5-dimethyl 1,3-hexadiene, 2,5-dimethyl-2,4-hexadiene, 2-neopentyl-1,3-butadiene, 1,3-cyclopentadiene, methylcyclopentadiene, 2-methyl-1,6- heptadiene, 1,3-cyclohexadiene, 1-vinyl-1,3-cyclohexadiene or a mixture thereof. More preferably, the conjugated diene is isoprene or butadiene or a mixture containing isoprene and / or butadiene. According to one variant, the monomers polymerized to form the elastomer portion of the TPE may be randomly copolymerized with at least one other monomer so as to form an elastomer block. According to this variant, the molar fraction of polymerized monomer other than an ethylenic monomer, relative to the total number of elastomeric block units, must be such that this block retains its elastomer properties. Advantageously, the molar fraction of this other comonomer may range from 0 to 50%, more preferably from 0 to 45% and even more preferably from 0 to 40%. By way of illustration, this other monomer capable of copolymerizing with the first monomer can be chosen from the ethylenic monomers as defined above (for example ethylene), the diene monomers, more particularly the conjugated diene monomers having 4 to 14 carbon atoms as defined above (for example butadiene), the monomers of the vinylaromatic type having from 8 to 20 carbon atoms as defined below or else it may be a monomer such as vinyl acetate). When the comonomer is of vinylaromatic type, it advantageously represents a fraction in units on the total number of units of the thermoplastic block of 0 to 50%, preferably ranging from 0 to 45% and even more preferentially ranging from 0 to 40%. As vinylaromatic compounds are particularly suitable styrenic monomers mentioned above, namely methylstyrenes, paraterti-butylstyrene, chlorostyrenes, bromostyrenes, fluorostyrenes or para-hydroxy-styrene. Preferably, the vinylaromatic comonomer is styrene. According to a preferred embodiment of the invention, the elastomer blocks of the TPE have in total a number-average molecular weight ("Mn") ranging from 25,000 g / mol to 350,000 g / mol, preferably from 35,000 g / mol to 250,000 g / mol so as to give the TPE good elastomeric properties and sufficient mechanical strength and compatible with the use of multilayer laminate tire. The elastomer block may also be a block comprising several types of ethylenic, diene or styrenic monomers as defined above. The elastomer block may also consist of several elastomeric blocks as defined above. The TPS elastomer may be chosen in particular from the group consisting of styrene / ethylene / butylene (SEB), styrene / ethylene / propylene (SEP), styrene / ethylene / ethylene / propylene (SEEP) block copolymers. , styrene / ethylene / butylene / styrene (SEBS), styrene / ethylene / propylene / styrene (SEPS), styrene / ethylene / ethylene / propylene / styrene (SEEPS), styrene / isobutylene (SIB), styrene / isobutylene / styrene (SIBS ), styrene / butadiene (SB), styrene / isoprene (SI), styrene / butadiene / isoprene (SBI), styrene / butadiene / styrene (SBS), styrene / isoprene / styrene (SIS), styrene / butadiene / isoprene / styrene (SBIS), styrene / butadiene / butylene (SBB), styrene / butadiene / butylene / styrene (SBBS) and mixtures of these copolymers. [00109] Preferably, the TPS elastomer is a polystyrene and polyisobutylene block copolymer. By such a definition is meant any thermoplastic copolymer having at least one polystyrene block (i.e. one or more polystyrene blocks) and at least one polyisobutylene block (i.e. one or more polyisobutylene blocks) , to which other blocks (for example polyethylene and / or polypropylene) and / or other monomer units (for example unsaturated units such as dienes) may or may not be associated. More preferably still, such a block copolymer is a triblock styrene / isobutylene / styrene copolymer (abbreviated "SIBS"). By elastomer or copolymer SIBS is meant in the present application, by definition, any styrene / isobutylene / styrene triblock elastomer in which the polyisobutylene central block may be interrupted or not by one or more unsaturated units, in particular one or more diene units such as isoprenic, possibly halogenated. The TPS elastomers are commercially available, sold for example with respect to SIBS by KANEKA under the name "SIBSTAR" (e.g. "Sibstar 102T", "Sibstar 103T" or "Sibstar 073T"). The rate of TPS in the second layer (that is to say, the total rate if there are several polystyrene block copolymers), is in a range from 5 to less than 50 phr, in particular included in a range from 5 to 45 phr and more particularly in a range from 10 to 40 phr. Below the minimum rate of GST, the adhesive effect is not sufficient while above the maximum recommended, the properties of the diene layer are too much altered by the strong presence of TPS.

II-2 Diene Elastomer - The composition of the diene layer comprises more diene elastomer (s) than thermoplastic elastomer (s). [00114] Thus, the composition of the diene layer comprises at least one (that is to say one or more) diene elastomer, which can be used alone, or in a blend with at least one (that is, say one or more other diene elastomer (or rubber). By elastomer or "diene" rubber, must be understood in a known manner one (one or more) elastomer derived at least in part (ie a homopolymer or a copolymer) of monomers dienes (monomers carrying two double bonds carbon - carbon, conjugated or not). These diene elastomers can be classified into two categories: "essentially unsaturated" or "essentially saturated". The term "essentially unsaturated" is generally understood to mean a diene elastomer derived at least in part from conjugated diene monomers, having a proportion of units or units of diene origin (conjugated dienes) which is greater than 15% (% by weight). mole). In the category of "essentially unsaturated" diene elastomers, the term "highly unsaturated" diene elastomer is particularly understood to mean a diene elastomer having a diene origin ratio (conjugated dienes) of greater than 50%. [00118] Thus, diene elastomers such as certain butyl rubbers or copolymers of dienes and alpha olefins of the EPDM type can be qualified as "substantially saturated" diene elastomers (level of units of weak diene origin or very low, always less than 15%). These definitions being given, the term "diene elastomer" is understood to mean, whatever the category above, which may be used in the compositions according to the invention: (a) - any homopolymer obtained by polymerization of diene a conjugated diene monomer having from 4 to 12 carbon atoms; (b) - any copolymer obtained by copolymerization of one or more conjugated dienes with each other or with one or more vinyl aromatic compounds having from 8 to 20 carbon atoms; (C) - a ternary copolymer obtained by copolymerization of ethylene, of an α-olefin having 3 to 6 carbon atoms with a non-conjugated diene monomer containing from 6 to 12 carbon atoms, for example elastomers obtained from ethylene, propylene with a non-conjugated diene monomer of the aforementioned type such as in particular 1,4-hexadiene, ethylidene norbornene, dicyclopentadiene; (d) - a copolymer of isobutene and isoprene (butyl diene rubber), as well as the halogenated versions, in particular chlorinated or brominated, of this type of copolymer. [00120] Any type of diene elastomer can be used in the invention. When the composition contains a vulcanization system, essentially unsaturated elastomers, especially types (a) and (b) above, are preferably used for the manufacture of the multilayer laminate according to the present invention. As conjugated dienes 1,3-butadiene, 2-methyl-1,3-butadiene, 2,3-di (C 1 -C 5 alkyl) -1,3-butadienes, such as 2,3-Dimethyl-1,3-butadiene, 2,3-diethyl-1,3-butadiene, 2-methyl-3-ethyl-1,3-butadiene, 2-methyl, 3-propyl-1,3-butadiene, 1,3-aryl-butadiene, 1,3-p-1,3-pentadiene, 2,4-hexadiene. Suitable vinylaromatic compounds are, for example, styrene, ortho-, meta-, para-methylstyrene, the commercial "vinyl-toluene" mixture, para-tert-butylstyrene, methoxystyrenes, chlorostyrenes, vinylmesitylene, divinylbenzene, vinylnaphthalene. The copolymers may contain between 99% and 20% by weight of diene units and between 1% and 80% by weight of vinylaromatic units. The elastomers may have any microstructure which is a function of the polymerization conditions used, in particular the presence or absence of a modifying and / or randomizing agent and the amounts of modifying and / or randomizing agent used. The elastomers may for example be prepared in dispersion or in solution; they may be coupled and / or starred or functionalized with a coupling agent and / or starring or functionalization. For coupling with carbon black, there may be mentioned for example functional groups comprising a C-Sn bond or amino functional groups such as benzophenone for example; for coupling to a reinforcing inorganic filler such as silica, there may be mentioned, for example, silanol or polysiloxane functional groups having a silanol end (as described for example in FR 2 740 778 or US Pat. No. 6,013,718); alkoxysilane groups (as described for example in FR 2,765,882 or US 5,977,238), carboxylic groups (as described for example in WO 01/92402 or US 6,815,473, WO 2004/096865 or US 2006/0089445) or else polyether groups (as described for example in EP 1 127 909 or US Pat. No. 6,503,973). As other examples of functionalized elastomers, mention may also be made of elastomers (such as SBR, BR, NR or IR) of the epoxidized type. The level of diene elastomer (that is to say, the total rate if there are several) in this second layer is between 50 and 95 phr. According to a preferred embodiment of the invention, the level of diene elastomer (that is to say, the total content if there are several) is preferably in a range from 55 to 95 phr and more preferably 60 to 90 phr. I-3. Nanoscale Loads [00124] The elastomers described above are sufficient on their own to make the multilayer laminate according to the invention usable, nevertheless a reinforcing filler 15 may be used in the composition of the diene layer of the laminate of the invention. When a reinforcing filler is used, one can use any type of filler usually used for the manufacture of tires, for example an organic filler such as carbon black, an inorganic filler such as silica, or a cutting of these two types of filler, especially a blend of carbon black and silica. When an inorganic reinforcing filler is used, it is possible for example to use, in known manner, a coupling agent (or bonding agent) which is at least bifunctional and intended to ensure a sufficient chemical and / or physical connection between the inorganic filler (surface of its particles) and the elastomer, in particular organosilanes or bifunctional polyorganosiloxanes. 4-I. Various Additives The diene layer of the multilayer laminate of the invention may further comprise the various additives usually present in the tire elastomeric layers known to those skilled in the art. For example, one or more additives chosen from protective agents such as antioxidants or antiozonants, anti-UV agents, various agents of implementation or other stabilizers, or promoters capable of promoting adhesion to the rest of the tire structure. Also and preferably, the composition of the diene layer contains a crosslinking system known to those skilled in the art. [00128] Optionally also, the composition of the layers of the multilayer laminate of the invention may contain a plasticizer, such as an extender oil (or plasticizing oil) or a plasticizing resin whose function is to facilitate the implementation the multilayer laminate, particularly its integration with the tire by a lowering of the module and an increase in the tackifying power.

III-Preparation of the multilayer laminate As indicated above, the multilayer laminate of the invention therefore has the essential characteristic of comprising at least two adjacent layers of elastomer: a first layer consisting of a composition based on at least one thermoplastic elastomer with polystyrene and polyisobutylene blocks, the content of thermoplastic elastomer with polystyrene and polyisobutylene blocks being in a range from more than 50 to 100 phr (parts by weight per 100 parts by weight of elastomer), and a plasticizer system comprising 1 to 40 phr of a plasticizing oil and 1 to 40 phr of a hydrocarbon resin, the total plasticizer content being in a range from 2 to 70 phr; a second layer, consisting of a composition based on at least one diene elastomer, the content of diene elastomer being in a range from more than 50 to 95 phr, and at least one thermoplastic styrene elastomer ( TP S), the styrene thermoplastic elastomer content being in a range from 5 to less than 50 phr. The multilayer laminate of the invention is prepared according to the methods known to those skilled in the art, by separately preparing the two layers of the laminate, and then by combining the thermoplastic layer with the diene layer, before or after cooking. of the latter. The combination of the thermoplastic layer and the diene layer can be done under the action of heat and possibly pressure. The composition of the waterproof layer of the laminate of the invention is here particularly suitable for laying said sealing layer after firing the diene layer of the laminate. III-1. First layer or waterproof thermoplastic layer The sealed thermoplastic layer of the multilayer laminate of the invention is prepared in a conventional manner, for example, by incorporating the various components into a twin-screw extruder, so as to perform the melting of the matrix. and an incorporation of all the ingredients, then use of a flat die for producing the thermoplastic layer. More generally, the shaping of the sealed thermoplastic layer can be made by any method known to those skilled in the art: extrusion, calendering, extrusion blow molding, injection, cast film. Preferably, the thermoplastic layer described above has a thickness greater than 0.05 mm, more preferably between 0.1 and 10 mm (for example from 0.2 to 2 mm). It will be readily understood that, depending on the specific fields of application, the dimensions and the pressures involved, the embodiment of the invention may vary, the first airtight layer comprising in fact several preferred ranges. thick. Thus, for example, for passenger-type tires, they may have a thickness of at least 0.3 mm, preferably between 0.5 and 2 mm. In another example, for pneumatic tires of heavy goods vehicles or agricultural vehicles, the preferred thickness may be between 1 and 3 mm. According to another example, for tires of vehicles in the field of civil engineering or for aircraft, the preferred thickness may be between 2 and 10 mm. III-2. Second layer or diene layer [00134] The diene layer of the multilayer laminate of the invention is prepared in appropriate mixers, using two successive preparation phases according to a general procedure well known to the person skilled in the art: a first phase of work or thermomechanical mixing (sometimes referred to as a "non-productive" phase) at a high temperature, up to a maximum temperature of between 130 ° C and 200 ° C, preferably between 145 ° C and 185 ° C, followed by a second mechanical working phase (sometimes called "productive" phase) at a lower temperature, typically less than 120 ° C, for example between 60 ° C and 100 ° C, finishing phase during which the system is incorporated crosslinking or vulcanization. According to a preferred embodiment of the invention, all the basic constituents of the compositions of the invention, with the exception of the vulcanization system, such as the TPS elastomers, the possible fillers, are incorporated in such a way that intimately, by kneading, with the diene elastomer during the so-called non-productive first phase, that is to say that it is introduced into the mixer and kneaded thermomechanically, in one or more steps, at least these different basic constituents until reaching the maximum temperature of between 130 ° C and 200 ° C, preferably between 145 ° C and 185 ° C. For example, the first phase (non-productive) is conducted in a single thermomechanical step during which is introduced into a suitable mixer such as a conventional internal mixer, all the necessary constituents, the possible additional coating or processing agents and other miscellaneous additives, with the exception of the vulcanization system. The total mixing time in this non-productive phase is preferably between 1 and 15 minutes. After cooling the mixture thus obtained during the first non-productive phase, the vulcanization system is then incorporated at low temperature, generally in an external mixer such as a roller mixer; the whole is then mixed (productive phase) for some 20 minutes, for example between 2 and 15 min. The final composition thus obtained is then calendered, for example in the form of a layer denominated in the present invention diene layer. III-3. Preparation of the laminate [00138] The multilayer laminate of the invention is prepared by combining the thermoplastic layer impervious to the diene layer, before or after firing thereof. Before baking, this consists in placing the thermoplastic layer on the diene layer to form the laminate of the invention and then baking the laminate or the tire provided with said laminate. After baking, the thermoplastic layer is deposited on the already cooked diene layer. In order for the adhesion to be established, a temperature at the interface greater than the temperature of use of the TPS, which is itself greater than the glass transition temperature (Tg), must be higher and, in the case of a semi-crystalline thermoplastic block, at the melting temperature (Tf) of said TPS, possibly associated with the application of pressure. IV- Use of the laminate in a tire The laminate of the invention can be used in any type of tire. It is particularly well suited for use in a pneumatic tire, finished tire product or semi-finished tire, rubber, especially in a tire for a motor vehicle such as a vehicle type two-wheel, tourism or industrial, or not automobile such as bicycle. The laminate of the invention can be made by combining the layers of the laminate before baking, or even after baking. More precisely, since the thermoplastic layer does not require firing, it can be associated with the diene layer of the laminate of the invention before or after the firing of this diene layer, which requires firing before being used in a tire. Thus, the sealed layer of the laminate of the invention can be advantageously assembled to the diene layer of the laminate after manufacture and firing of a tire incorporating as the last radially inner layer the diene layer of the laminate of the invention. In this case, the assembly of the two layers of the laminate of the invention is subsequent to the manufacture of the tire incorporating the diene layer of said laminate. The multilayer laminate of the invention is advantageously usable in tires of all types of vehicles, particularly in tires for passenger vehicles likely to run at very high speeds or tires for industrial vehicles such as heavy goods vehicles. . [00142] Such a laminate is preferably disposed on the inner wall of the pneumatic object, covering it completely or at least in part, but it can also be completely integrated into its internal structure. Compared to a conventional butyl rubber-based sealing layer, the multilayer laminate of the invention has the advantage of having a much lower hysteresis, and thus of offering reduced rolling resistance to pneumatic tires. by the use of a thermoplastic waterproof layer. In addition, this thermoplastic sealing layer can be placed on the diene layer of the laminate after the tire has been baked. In addition, compared to known sealing layers comprising the polystyrene and polyisobutylene block copolymer, the laminate of the invention has the major advantage of adhering to a conventional diene layer, without the need for a protective layer. specific adhesion, since the second layer of the laminate is this conventional layer, in which a fraction of the diene elastomer is replaced by a thermoplastic styrene elastomer (TPS). V- Examples V-1. Preparation of Examples [00145] The examples of multilayer laminate of the invention are prepared as indicated above. V-2. Description of the Tests Used Viscosity Measurement The principle consists in measuring the modulus of the dynamic viscosity during a shear stress. A dynamic mechanical rheometer (RPA 2000) marketed by the company Alpha Technologies is used. The sample is in the form of a disk with a mass of 5g. The sample is confined by means of an O-ring between two plates imposing a cone / cone type geometry. The lower plate is movable in rotation while the upper plate is fixed; the movable jaw makes it possible to apply a dynamic angular deformation of 5% at a frequency of 10 Hz during a temperature rise (from 40 ° to 220 ° C. at a speed of the order of 3 ° C./min); the apparatus measures the imposed torque corresponding to the imposed angular deformation and derives the modulus from the dynamic viscosity η (in Pa · $) of the material during this mechanical and thermal stress. The results are in the form of a modulus curve of the dynamic viscosity ri as a function of the temperature. There are two particular values of the viscosity corresponding respectively to the temperature of 50 ° C and 200 ° C. The comparison of the studied materials is done on the basis of the value of the viscosity riz000c An arbitrary value of 100 is given for the viscosity of the control, a result higher than 100 indicating a decrease of the viscosity, and thus an improvement of the viscosity performance . Measurement of Hysteresis The principle consists in measuring the loss modulus (E ") of a film of material during a dynamic stressing process, using a dynamic mechanical analyzer (DMA Q800) marketed by the company. The sample is in the form of a film 4 mm wide and 1 mm thick The sample holder consists of 2 jaws coming to grip the ends of the sample, the inter-jaw distance is 10 mm, the upper jaw is movable while the lower jaw is fixed, the movable jaw allows to apply a static pre-stress of 0.1 N which is added a dynamic deformation of 7% at a frequency of 1 Hz for one temperature rise (from ambient to 180 ° C. to 3 ° C./min), the loss module E "10 generated by the material during this mechanical and thermal stress is recorded. The results are in the form of a loss modulus curve E "as a function of temperature The comparison of the materials studied is based on the value of the loss module E" corresponding to the temperature of 40 ° C. . An arbitrary value of 100 is given for the loss module of the control, a result greater than 100 indicating a decrease in the loss modulus E ", that is to say hysteresis, and therefore an improvement in the performance. hysteresis Leak tests (or permeability test) [00150] For this analysis, a rigid wall permeameter is used, placed in an oven (temperature of 60 ° C in this case), equipped with a pressure sensor Relative 20 (calibrated in the range of 0 to 6 bar) and connected to a tube equipped with an inflation valve The permeameter can receive standard specimens in disk form (for example 65 mm diameter in this case) and uniformly thick up to 1.5 mm (0.5 mm in this case) The pressure sensor is connected to a National Instruments data acquisition board (four-channel analog 0- 25 10 V ) that is connected to a computer that is acquiring a isition continuously with a frequency of 0.5 Hz (1 point every two seconds). The coefficient of permeability (K) is measured from the linear regression line giving the slope a of the loss of pressure through the test piece as a function of time, after stabilization of the system that is to say obtaining a stable regime in which the pressure decreases linearly with time. An arbitrary value of 100 is given for the airtightness of the control, a result of greater than 100 indicating an increase in the airtightness thus a decrease in the permeability, and therefore an improvement of permeability performance. Adhesion Measurement [00151] The multilayer laminate examples of the invention are tested for the adhesion of the thermoplastic layer to the diene layer in a peel test. The peel test pieces are made by contacting the two layers of the laminate, each of the layers being reinforced by a fabric (so as to limit the deformation of said layers under tension). A rupture primer is inserted between the two layers. Depending on whether the adhesion is evaluated before or after curing, the mixture of the diene layer is respectively uncooked or pre-cooked (180 ° C. for 10 minutes). In all cases, the laminate specimen once assembled is heated to 180 ° C under pressure for 10 minutes. 30 mm wide strips are cut with a paper cutter. Both sides of the breakout primer are then placed in the jaws of an Intron brand traction machine. The tests are carried out at ambient temperature and at a tensile speed of 100 mm / min. The tensile forces are recorded and these are standardized by the width of the specimen. A force curve is obtained per unit of width (in N / mm) as a function of the displacement of the moving beam of the traction machine (between 0 and 200 mm). The value of adhesion retained corresponds to the initiation of the rupture within the specimen and therefore to the maximum value of this curve. The performances of the examples are standardized with respect to the control (base 100), a result greater than 100 thus indicating an improvement in the adhesion performance. V-3. Examples V-3-1. Examples of Laminate Layers [00153] Various sealed thermoplastic compositions of multilayer laminate, and various diene layers have been prepared, the compositions are shown in Tables 1A and 1B below. Table lA Thermoplastic Composition Al A2 A3 A4 A5 SIBS 102T -KANEKA- (pce) 100 100 100 100 100 Oil PIB H1200 -INEOS- (pce) 65 0 25 0 12.5 -34- Resin SA 140 - ARIZONA (pce) 0 PLASTIC FILLING SYA21R - YAMAGUSHI (pce) 28 0 0 0 0 [00154] In composition A1, 28 phr of the lamellar filler corresponds to a level of 5% (volume percentage). Table 1B Diene Composition: B1 B2 B3 B4 B5 NR (1) 55 38 38 42 24 BR (2) 20 14 14 28 16 SBR (3) 25 16 16 0 0 SIS (4) 0 32 0 0 0 SEBS (5) 0 0 32 0 0 SIBS (6) 0 0 0 30 60 Carbon black (7) 42 42 42 60 60 Plasticizer (8) 14 14 14 0 0 Antioxidant (9) 1.5 1.5 1.5 1.5 1.5 Stearic acid 1 1 1 0.5 0.5 ZnO 3 3 3 3 3 Sulfur 2 2 2 2.5 2.5 Accelerator (10) 1 1 1 1.5 1.5 (1) NR natural rubber ( 2) BR polybutadiene with 4% 1,2- and 93% 1,4-cis (Tg = -106 ° C) (3) SBR styrene-butadiene copolymer solution with 25% styrene and 48% modifs 1,2 of the butadiene part (Tg of -48 ° C) (4) SIS "D1161" sold by Kraton (5) SEBS "G1654" sold by Kraton (6) SIBS "Sibstar 102 T" marketed by the company Kaneka (7) Grade ASTM N347 or ASTM N683 sold by the company Cabot (8) MES oil "Catenex SNR" marketed by the company Shell 15 (9) N- (1,3-dimethylbutyl) -N'-phenyl-p- phenylenediamine "6-PPD" from Flexsys (10) N-cyclohexyl-2-benzothiazol sulfenamide "Santocure CBS" from Flexsys V-3-2. Examples of Improved Adhesion Laminates Assembly of Pre-Bake Layers [00155] Initially, composition A1, and various diene layers were prepared, assembled prior to curing and tested as previously indicated, adhesion results are presented in FIG. Table 2 below. Table 2 Multilayer Laminate Al / B1 A1 / B2 A1 / B3 A1 / B4 A1 / B5 Adherence (%) 100 264 560 390 472 [00156] The results presented in Table 2 demonstrate the excellent adhesion results of the laminate wherein the diene layer comprises a styrenic thermoplastic elastomer, compared to a situation in which the thermoplastic layer is associated with a conventional diene layer (i.e., not including any TPS in its composition). It is also noted that the adhesion of the laminate is of the same level as the adhesion of a laminate of two thermoplastic layers represented by the combination of Al with B5.

Assembly of the layers after firing In a second step, the thermoplastic composition A1, and the layers denoted B1, B4 and B5 previously defined were prepared, assembled after firing and tested as indicated above, the adhesion results are presented. in Table 3 below. Table 3 Multilayer Laminate Al / B1 Al / B4 Al / B5 Adhesion (%) 100 440 361 [00158] The results presented in Table 3 demonstrate the excellent adhesion results of the laminate in which the diene layer comprises a styrenic thermoplastic elastomer , including after baking the diene layer. It is also noted that the A1 / B5 control shows that a GST content of more than 50 phr in the so-called diene layer does not make it possible to obtain as good adhesion as with the laminate in which the diene layer comprises a styrene thermoplastic elastomer content in a range from 5 to less than 50 phr. [00159] Furthermore, for an assembly of the first layer of the laminate (the thermoplastic sealing layer) with the second layer of the laminate (the diene layer) after the latter has been baked, the applicants have continued their work in order to obtain a first layer which is easily removable hot (for example at 200 ° C) on the already cooked diene layer without losing the good adhesion observed above and in particular to obtain a seal and a satisfactory hysteresis.

V-3-3. Example of laminates according to the invention A laminate according to the invention (A5 / B3), including in the first layer the previously described plasticizer system was prepared and tested, in comparison with controls which do not have the specific plasticizer system. to the invention (A2 / B3, A3 / B3 and A4 / B3). The results are shown in Table 4. Table 4 Multilayer laminate A2 / B3 A3 / B3 A4 / B3 A5 / B3 Performance viscosity at 200 ° C 100 145 120 145 Hysteresis performance 100 185 46 130 Performance permeability 100 78 129 124 Performance adhesion 100 The results presented in Table 4 show that only the plasticizer system according to the invention (laminate A5 / B3) makes it possible to improve both the viscosity at 200 ° C., the hysteresis and the permeability of the laminate, while maintaining good adhesion between the two layers. Indeed, the use of oil only penalizes the performance of permeability and adhesion, while the use of resin only penalizes the performance in hysteresis. [00162] In conclusion, compared to known laminates using an adhesion layer 20 to assemble a thermoplastic sealing layer and a diene layer, the invention makes it possible to overcome the adhesion layer, in particular by inserting a fraction of TPS elastomer in the diene layer, while allowing to have a viscosity level facilitating assembly after firing of the diene layer and further promoting the performance of permeability and hysteresis.

Claims (33)

REVENDICATIONS1. Waterproof elastomeric laminate for a tire, said laminate comprising at least two superposed layers of elastomer: a first layer, consisting of a composition based on at least one thermoplastic elastomer with polystyrene and polyisobutylene blocks, the thermoplastic elastomer content at polystyrene and polyisobutylene blocks being in a range from more than 50 to 100 phr (parts by weight per 100 parts by weight of elastomer), and a plasticizer system comprising 1 to 40 phr of a plasticizing oil and 1 to 40 phr of a hydrocarbon resin, the total content of plasticizer being in a range from 2 to 70 phr; a second layer, consisting of a composition based on at least one diene elastomer, the content of diene elastomer being in a range from more than 50 to 95 phr, and at least one thermoplastic styrene elastomer ( TPS), the styrene thermoplastic elastomer content being in a range from 5 to less than 50 phr. The laminate of claim 1, wherein the polystyrene and polyisobutylene block copolymer of the first layer is a styrene / isobutylene / styrene copolymer (SIBS). 3. Laminate according to any one of the preceding claims, wherein the level of thermoplastic elastomer polystyrene blocks and polyisobutylene in the composition of the first layer is in a range from 70 to 100 phr. 25 4. A laminate according to claim 3, wherein the level of thermoplastic elastomer polystyrene blocks and polyisobutylene in the composition of the first layer is in a range from 80 to 100 phr. 30 Laminate according to claim 4, wherein the thermoplastic elastomer is the only elastomer of the first layer. Laminate according to any of the preceding claims, wherein the plasticizing system of the first layer comprises from 2 to 30 phr, and preferably from 5 to 20 phr of a plasticizing oil. A laminate according to any one of the preceding claims, wherein the plasticizing oil of the first layer is selected from the group consisting of polyolefinic oils, paraffinic oils, naphthenic oils, aromatic oils, mineral oils and the like. mixtures of these oils. 8. A laminate according to claim 7, wherein the plasticizing oil of the first layer is a polybutene oil, and preferably a polyisobutylene oil. Laminate according to any one of the preceding claims, wherein the plasticizing system of the first layer comprises from 2 to 30 phr, and preferably from 5 to 20 phr of hydrocarbon resin. A laminate according to any one of the preceding claims, wherein the hydrocarbon resin of the first layer is selected from the group consisting of homopolymer or copolymer resins of cyclopentadiene or dicyclopentadiene, terpene homopolymer or copolymer resins, terpene phenol homopolymer or copolymer resins, homopolymer or C5 cut copolymer resins, homopolymer or C9 cut copolymer resins, alpha-methyl-styrene homopolymer or copolymer resins and blends of these resins. 25 The laminate of claim 10, wherein the hydrocarbon resin of the first layer is selected from the group consisting of copolymer resins of two different vinyl aromatic monomers, (D) CPD / vinyl aromatic, copolymer resins (D) CPD / terpene, copolymer resins (D) CPD / C5 cut, copolymer resins (D) CPD / C5 cut, copolymer resins (D) CPD / C9 cut, terpene / vinylaromatic copolymer resins, resins of terpene / phenol copolymer, C5 / vinylaromatic cut copolymer resins, and mixtures of these resins. A laminate according to claim 11, wherein the hydrocarbon resin of the first layer is selected from the group consisting of homopolymer resins (D) CPD, copolymer resins (D) CPD / styrene, polylimonene resins, limonene / styrene copolymer resins, limonene / D (CPD) copolymer resins, C5 / styrene cut copolymer resins, C5 / C9 cut copolymer resins, styrene / alphamethylstyrene copolymer resins, and blends of these resins. The laminate of claim 12, wherein the hydrocarbon resin of the first layer is a styrene / alphamethylstyrene copolymer resin. 14. Laminate according to any one of the preceding claims, wherein the total plasticizer content is in a range from 5 to 45 phr. 15 Laminate according to any of the preceding claims, wherein the total plasticizer content is within a range of 10 to 35 phr. Laminate according to any one of the preceding claims, wherein the first layer further comprises a lamellar filler. 20 Laminate according to any one of the preceding claims, wherein the first layer does not contain a crosslinking system. A laminate according to any one of the preceding claims, wherein the elastomeric blocks of the styrenic thermoplastic elastomers (TPS) of the second layer are selected from elastomers having a glass transition temperature of less than 25 ° C. A laminate according to any one of the preceding claims wherein the elastomeric blocks of the styrenic thermoplastic elastomers (TPS) of the second layer are selected from the group consisting of ethylenic elastomers, diene elastomers and mixtures thereof. 20. A laminate according to any one of the preceding claims wherein the elastomeric blocks of the styrenic thermoplastic elastomers (TPS) of the second layer are selected from ethylenic elastomers. 21. Laminate according to any one of claims 1 to 19 wherein the elastomeric blocks of the styrenic thermoplastic elastomers (TPS) of the second layer are selected from diene elastomers. Laminate according to any one of claims 1 to 21, wherein the styrenic thermoplastic elastomers (TPS) of the second layer comprise between 5 and 50% by weight of styrene. 23. A laminate according to any one of claims 1 to 19 or 22 wherein the styrenic thermoplastic elastomers (TPS) of the second layer are selected from the group consisting of thermoplastic copolymer elastomers styrene / ethylene / butylene (SEB), styrene / ethylene / propylene (SEP), styrene / ethylene / ethylene / propylene (SEEP), styrene / ethylene / butylene / styrene (SEBS), styrene / ethylene / propylene / styrene (SEPS), styrene / ethylene / ethylene / propylene / styrene ( SEEPS), styrene / isobutylene (SIB), styrene / isobutylene / styrene (SIBS), styrene / butadiene (SB), styrene / isoprene (SI), styrene / butadiene / isoprene (SBI), styrene / butadiene / styrene (SBS) styrene / isoprene / styrene (SIS), styrene / butadiene / isoprene / styrene (SBIS), styrene / butadiene / butylene (SBB), styrene / butadiene / butylene / styrene (SBBS) and mixtures of these copolymers. 24. A laminate according to any one of the preceding claims, wherein the content of thermoplastic styrene elastomer (TPS) in the composition of the second layer is in a range from 5 to 45 phr. 25. A laminate according to claim 24, wherein the level of thermoplastic styrene elastomer (TPS) in the composition of the second layer is within a range of from 10 to 40 phr. 26. Laminate according to one of the preceding claims wherein the diene elastomer of the second layer is selected from the group consisting of essentially unsaturated diene elastomers, and mixtures of these elastomers. 27. A laminate according to claim 26 wherein the diene elastomer of the second layer is selected from the group consisting of homopolymers obtained by polymerization of a conjugated diene monomer having from 4 to 12 carbon atoms, the copolymers obtained by copolymerization d one or more dienes conjugated to one another or to one or more vinyl aromatic compounds having 8 to 20 carbon atoms, and mixtures thereof. The laminate of claim 27, wherein the diene elastomer of the second layer is selected from the group consisting of polybutadienes, synthetic polyisoprenes, natural rubber, butadiene copolymers, isoprene copolymers, and the like. mixtures of these elastomers. 29. A laminate according to any one of the preceding claims, wherein the second layer comprises a reinforcing filler. 20 30. A laminate according to claim 29, wherein the reinforcing filler of the second layer is carbon black and / or silica. 31. The laminate of claim 30, wherein the majority reinforcing filler of the second layer is a carbon black. 25 32. A tire comprising a laminate according to any one of the preceding claims. 33. Use in a pneumatic object of a laminate according to any one of claims 1 to 31.