Article, in particular a tire

Abstract

The article is intended to come into contact with the ground, and comprises a laminate comprising at least two overlapping portions comprising an FP made from a FC and an SP made from a SC, the SP being located further from the ground than the FP, each FC and SC being based on at least one elastomeric matrix, a reinforcing filler, a plasticizer and a sulfur-based vulcanization accelerator, the phr amount of the reinforcing filler in the SC being less than the phr amount of the reinforcing filler in the FC, the ratio of the phr amount of the plasticizer to the reinforcing filler in the SC being greater than the ratio of the phr amount of the plasticizer to the reinforcing filler in the FC, and the phr amount of the sulfur-based vulcanization accelerator in the SC being less than the phr amount of the sulfur-based vulcanization accelerator in the FC.

Description

[Technical field]

[0001] The field of the invention is that of articles such as tyres, shoes or caterpillar tracks, in particular that of tyres. [Background technology]

[0002] Regarding articles intended to come into contact with the ground, such as tires, the following Patent Documents 1 and 2 disclose tires having special cap treads and under treads to reduce road noise, which is noise generated when an article comes into contact with the road surface. A consistent goal of article manufacturers is to further improve noise reduction performance.

[0003] During research, the inventors discovered that an article having a laminate including at least two overlapping portions that include a particular rubber composition allows for improved road noise performance. In this specification, all percentages (%) given are weight percentages (wt%) unless expressly stated otherwise. The expression "elastomeric matrix" is understood to mean, in a given composition, all the elastomers present in the rubber composition. The abbreviation "phr" means parts by weight per 100 parts by weight of elastomeric matrix in the rubber composition considered. In this specification, unless otherwise clearly indicated, each Tg DSC The (glass transition temperature) is measured in a known manner by DSC (differential scanning calorimetry) according to standard ASTM D3418-08. Any value interval indicated by the expression "between a and b" denotes a range of values ​​greater than "a" and less than "b" (i.e., excluding the limits a and b), whereas any value interval indicated by the expression "from a to b" means a range of values ​​spanning "from a to b" (i.e., including the strict limits a and b). The expression "based on" is to be understood in the present application to mean a composition comprising a mixture, reaction products or both of the various components used, some of which are capable or intended to at least partially react together during the various stages of preparation of the composition, in particular during vulcanization (curing). Summary of the Invention

[0004] Solutions to the challenges A first aspect of the invention is an article intended to come into contact with the ground, said article comprising a laminate comprising at least two overlapping parts, said first part (FP) made from a first rubber composition (FC) and said second part (SP) made from a second rubber composition (SC), said second part (SP) being located further from the ground than said first part (FP), said rubber compositions (FC and SC) each comprising at least one elastomeric matrix, reinforcing filler, plasticizer and sulphur-based filler. The article is based on a vulcanization accelerator, the phr amount of the reinforcing filler in the second rubber composition (SC) being less than the phr amount of the reinforcing filler in the first rubber composition (FC), the ratio of the phr amount of the plasticizer to the reinforcing filler in the second rubber composition (SC) being greater than the ratio of the phr amount of the plasticizer to the reinforcing filler in the first rubber composition (FC), and the phr amount of the sulfur-based vulcanization accelerator in the second rubber composition (SC) being less than the phr amount of the sulfur-based vulcanization accelerator in the first rubber composition (FC).

[0005] Advantageous Effects of the Invention Articles having laminates including portions that include the particular rubber composition allow for improved road noise performance. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0006] Unless expressly stated otherwise, each of the following aspects, embodiments, examples, and variations, including preferred ranges, materials, or both, can be applied to any one of the other aspects, other embodiments, other examples, and other variations of the invention. Each rubber composition (FC and SC) of the laminate of the article according to the invention is based on an elastomeric matrix. A "diene" type elastomer (or loosely "rubber", these two terms being considered synonymous) is to be understood in the known sense as a (i.e., one or more) elastomers (i.e., homopolymers or copolymers) derived at least in part from diene monomers (monomers having two carbon-carbon double bonds, whether conjugated or not).

[0007] These diene elastomers can be divided into two categories: "essentially unsaturated" or "essentially saturated". In general, the term "essentially unsaturated" is understood to mean diene elastomers that are at least partially derived from conjugated diene monomers with a content of diene-derived (conjugated diene) units of more than 15% (mol %); therefore, diene elastomers such as butyl rubber or diene / α-olefin copolymers of the EPDM type do not fall within the above definition and can in particular be described as "essentially saturated" diene elastomers (low or very low content of diene-derived units, always less than 15%). Within the category of "essentially unsaturated" diene elastomers, the term "highly unsaturated" diene elastomers is understood to mean in particular diene elastomers with a content of diene-derived (conjugated diene) units of more than 50%. This applies to all types of diene elastomers, although those skilled in the art of articles such as tires will understand that the present invention is preferably used with essentially unsaturated diene elastomers. Taking these definitions into account, the expression diene elastomers which can be used in the composition according to the invention means in particular (a) - any homopolymer obtained by polymerization of conjugated diene monomers, preferably having from 4 to 12 carbon atoms; (b) any copolymer obtained by copolymerization of one or more conjugated dienes with one another or with one or more vinyl aromatic compounds, preferably with one or more vinyl aromatic compounds having from 8 to 20 carbon atoms; is understood to mean.

[0008] The following are particularly suitable as conjugated dienes: 1,3-butadiene, 2-methyl-1,3-butadiene, 2,3-di(C1-C5 alkyl)-1,3-butadienes, such as, for example, 2,3-dimethyl-1,3-butadiene, 2,3-diethyl-1,3-butadiene, 2-methyl-3-ethyl-1,3-butadiene or 2-methyl-3-isopropyl-1,3-butadiene, aryl-1,3-butadienes, 1,3-pentadiene or 2,4-hexadiene. For example, the following are suitable as vinyl aromatic compounds: styrene, ortho-, meta- or para-methylstyrene, the "vinyl toluene" commercial mixture, para-(tert-butyl)styrene, methoxystyrene, chlorostyrene, vinylmesitylene, divinylbenzene or vinylnaphthalene.

[0009] A second aspect of the present invention is the article according to the first aspect, wherein for at least one of the first rubber composition (FC), the second rubber composition (SC) or a combination thereof, the elastomeric matrix comprises at least one diene elastomer selected from the group consisting of polybutadiene (BR), polyisoprene, butadiene copolymers, isoprene copolymers and combinations thereof, preferably for each of the rubber compositions (FC and SC), the elastomeric matrix comprises at least one diene elastomer selected from the group consisting of polybutadiene (BR), polyisoprene, butadiene copolymers, isoprene copolymers and combinations thereof. According to a preferred embodiment of the second aspect, the copolymer is preferably selected from the group consisting of butadiene copolymers and combinations thereof, more preferably selected from the group consisting of styrene-butadiene copolymers (SBR), butadiene-isoprene copolymers (BIR), styrene-isoprene copolymers (SIR), styrene-butadiene-isoprene copolymers (SBIR) and combinations thereof, even more preferably selected from the group consisting of styrene-butadiene copolymers (SBR) and combinations thereof.

[0010] The diene elastomers may have any microstructure depending on the polymerization conditions used, in particular the presence or absence of modifiers, randomizers, or both, and the amount of modifiers, randomizers, or both used. The elastomers may be, for example, block, statistical, sequential, or microsequential elastomers, and may be prepared in dispersion or solution. The elastomers may be coupled, star-branched, or both, or may be functionalized with coupling agents, star-branching agents, or both, or functionalizing agents. According to a more preferred embodiment of the preferred embodiment, for the first rubber composition (FC), the elastomeric matrix comprises at least 50 phr and up to 100 phr, preferably at least 55 phr, more preferably at least 60 phr, even more preferably at least 65 phr, in particular at least 70 phr, in particular at least 75 phr, of a first diene elastomer which is a styrene-butadiene copolymer, preferably a solution styrene-butadiene copolymer, and the elastomeric matrix does not comprise a second diene elastomer or comprises up to 50 phr, preferably up to 45 phr, more preferably up to 40 phr, even more preferably up to 35 phr, in particular up to 30 phr, in particular up to 25 phr, of a second diene elastomer different from the first diene elastomer. According to an even more preferred embodiment of the present invention, the first diene elastomer has a glass transition temperature (Tg DSC ) is observed. According to a particular embodiment of an even more preferred embodiment, the first diene elastomer has a glass transition temperature (Tg) of greater than -110 ° C, preferably greater than -105 ° C, more preferably greater than -100 ° C, even more preferably greater than -95 ° C, in particular greater than -90 ° C. DSC ) is observed.

[0011] According to an even more preferred embodiment of the more preferred embodiment, the second diene elastomer is a polybutadiene (BR), preferably having a glass transition temperature (Tg) of less than -60°C, preferably less than -70°C, more preferably less than -80°C, even more preferably less than -90°C, in particular less than -100°C. DSC ) is polybutadiene (BR). According to a particular embodiment of an even more preferred embodiment, the polybutadiene has a glass transition temperature (Tg) of greater than -140°C, preferably greater than -135°C, more preferably greater than -125°C, even more preferably greater than -120°C, in particular greater than -115°C, especially at least -110°C. DSC ) is observed. A third aspect of the present invention is the article according to the first or second aspect, wherein for the second rubber composition (SC), the elastomeric matrix comprises at least 50 phr, preferably at least 55 phr, more preferably at least 60 phr, even more preferably at least 65 phr, in particular at least 70 phr, in particular at least 75 phr, even more particularly at least 80 phr, advantageously at least 85 phr, more advantageously at least 90 phr, even more advantageously at least 95 phr and in particular 100 phr of polyisoprene.

[0012] According to a preferred embodiment of the third aspect, the polyisoprene is natural rubber (NR), synthetic polyisoprene (IR) or a combination thereof. The synthetic polyisoprene may be synthetic cis-1,4-polyisoprene, preferably having a content (mol %) of cis-1,4 bonds of more than 90%, more preferably more than 95%, even more preferably at least 98%. Each rubber composition (FC and SC) of the laminate of the article according to the invention is based on a reinforcing filler. The reinforcing filler may include an organic reinforcing filler (eg, carbon black), an inorganic reinforcing filler (eg, silica), or a combination thereof. Any type of reinforcing filler known for its ability to reinforce rubber compositions which may be used in the manufacture of articles may be used, for example organic reinforcing fillers such as carbon black, or inorganic reinforcing fillers such as silica, in combination with a coupling agent in a known manner. The article according to the invention has the essential feature that the phr amount of reinforcing filler in the second rubber composition (SC) is lower than the phr amount of reinforcing filler in the first rubber composition (FC).

[0013] According to a preferred embodiment of the invention, the phr amount of reinforcing filler in the second rubber composition (SC) is less than 95%, preferably 90%, more preferably 85%, even more preferably 80%, in particular less than 75%, in particular 70%, even more particularly 65%, advantageously 60%, more advantageously 55% and even more advantageously 50% of the phr amount of reinforcing filler in the first rubber composition (FC). According to a preferred embodiment of the present invention, the amount of reinforcing filler in the first rubber composition (FC) is more than 70 phr, preferably more than 75 phr, more preferably more than 80 phr, even more preferably more than 85 phr, in particular more than 90 phr, especially more than 95 phr, even more especially more than 100 phr, advantageously more than 105 phr and more advantageously more than 110 phr. According to a preferred embodiment of the present invention, the amount of reinforcing filler in the first rubber composition (FC) is less than 300 phr, preferably less than 280 phr, more preferably less than 260 phr, even more preferably less than 240 phr, in particular less than 220 phr, especially less than 200 phr, even more especially less than 180 phr, advantageously less than 160 phr, more advantageously less than 140 phr and even more advantageously less than 120 phr. A fourth aspect of the present invention is the article according to any one of the first to third aspects, wherein for the second rubber composition (SC), the amount of reinforcing filler is at most 110 phr, preferably at most 105 phr, more preferably at most 100 phr, even more preferably at most 95 phr, in particular at most 90 phr, in particular at most 85 phr, even more particularly at most 80 phr, advantageously at most 75 phr, more advantageously at most 70 phr, and even more advantageously at most 65 phr.

[0014] A fifth aspect of the present invention is the article according to any one of the first to fourth aspects, wherein for the second rubber composition (SC), the amount of reinforcing filler is at least 15 phr, preferably at least 20 phr, more preferably at least 25 phr, even more preferably at least 30 phr, in particular at least 35 phr, in particular at least 40 phr, even more particularly at least 45 phr, advantageously at least 50 phr, more advantageously at least 55 phr, and even more advantageously at least 60 phr. According to a preferred embodiment of the present invention, for the first rubber composition (FC), the reinforcing filler comprises mainly inorganic reinforcing filler, i.e. the reinforcing filler comprises more than 50% by mass of inorganic reinforcing filler per 100% by mass of reinforcing filler, preferably the reinforcing filler comprises more than 60% by mass, more preferably more than 70% by mass, even more preferably more than 80% by mass, in particular more than 90% by mass of inorganic reinforcing filler per 100% by mass of reinforcing filler. According to a more preferred embodiment of the preferred embodiment, the inorganic reinforcing filler comprises more than 60% by weight, preferably more than 70% by weight, more preferably more than 80% by weight, even more preferably more than 90% by weight, in particular 100% by weight, of silica per 100% by weight of the inorganic reinforcing filler.

[0015] A sixth aspect of the present invention is the article according to any one of the first to fifth aspects, wherein for the second rubber composition (SC), the reinforcing filler comprises mainly inorganic reinforcing filler, i.e. the reinforcing filler comprises more than 50 mass% of inorganic reinforcing filler per 100 mass% of reinforcing filler, and preferably the inorganic reinforcing filler comprises mainly silica, i.e. the inorganic reinforcing filler comprises more than 50 mass% of silica per 100 mass% of inorganic reinforcing filler. According to a preferred embodiment of the sixth aspect, for the second rubber composition (SC), the reinforcing filler comprises more than 60 mass%, preferably more than 70 mass%, more preferably more than 80 mass%, and even more preferably more than 90 mass% of inorganic reinforcing filler per 100 mass% of the reinforcing filler. The expression "inorganic reinforcing filler" is to be understood here to mean any inorganic or mineral filler, also called "white filler", "transparent filler" or even "non-black filler", regardless of its color and its origin (natural or synthetic), which, in contrast to carbon black, is capable of reinforcing rubber compositions intended for the manufacture of tires by itself without any other means than intermediate coupling agents, in other words capable of replacing conventional tire-grade carbon black in its reinforcing role; such fillers are generally characterized, in a known manner, by the presence of hydroxyl (-OH) groups on their surface.

[0016] The physical state of the filler in its presence, i.e., whether it is a powder, microbeads, granules, beads or any other suitable densified form, is not important. Of course, various inorganic fillers, preferably highly disperse siliceous, aluminous fillers or mixtures of combinations thereof, are described below as inorganic reinforcing fillers. Mineral fillers of the siliceous type, preferably silica (SiO2), aluminous type, preferably alumina (Al2O3), or combinations thereof, are particularly suitable as inorganic reinforcing fillers. According to a sixth aspect or a more preferred embodiment of the preferred embodiment, for the second rubber composition (SC), the inorganic reinforcing filler comprises more than 60 mass %, preferably more than 70 mass %, more preferably more than 80 mass %, even more preferably more than 90 mass %, in particular 100 mass % of silica per 100 mass % of the inorganic reinforcing filler.

[0017] The silica may be one type of silica or a mixture of several silicas. The silica used may be any reinforcing silica known to those skilled in the art, in particular those having a BET surface area and a CTAB specific surface area of ​​up to 450 m 2 / g, preferably 20 to 400m 2 / g, more preferably 50 to 350m 2 / g, and more preferably 100 to 300 m 2 / g, especially 150-250m 2 The silica may be any precipitated or pyrogenic silica with a specific surface area of ​​0.01 to 0.05 / g, the BET surface area being measured by gas adsorption using known methods, i.e. the Brunauer-Emmett-Teller method described in ''The Journal of the American Chemical Society'', Vol. 60, page 309, February 1938, more specifically according to the French standard NF ISO 9277 of December 1996 (multipoint volume method (5 points); gas: nitrogen, degassing: 1 hour at 160°C, relative pressure range p / po: 0.05 to 0.17). The CTAB specific surface area is determined according to the French standard NF T 45-007 of November 1987 (method B). Such silicas may be coated or uncoated.

[0018] Those skilled in the art will understand that reinforcing fillers of another nature, in particular organic nature, such as carbon black, can be used as equivalent fillers to the inorganic reinforcing fillers described in this section, provided that the reinforcing fillers are covered with an inorganic layer, such as silica, or otherwise contain functional sites, in particular hydroxyls, on their surface, and require the use of coupling agents to form a connection between the filler and the elastomer. By way of example, mention may be made of carbon black for tires, as described in patent applications WO 96 / 37547 and WO 99 / 28380. For example, silane polysulfides, which are referred to as "symmetric" or "asymmetric" depending on their particular structure, as described in applications WO 03 / 002648, WO 03 / 002649 and WO 2004 / 033548, can in particular be used. Particularly suitable silane polysulfides have the following general formula (I): (I)ZA-Sx-AZ Corresponding to, During the ceremony, - x is an integer from 2 to 8 (preferably from 2 to 5), A is a divalent hydrocarbon radical (preferably C-C 18 Alkylene group or C6-C 12 Arylene groups, especially C1-C 10 , in particular C1-C4 alkylene, especially propylene), Z has the formula:

[0019] [ka] [In the formula, - R which are unsubstituted or substituted and identical or different from each other 1 The group is C1-C 18 Alkyl, C5-C 18 Cycloalkyl or C6-C 18 an aryl group (preferably a C1-C6 alkyl, cyclohexyl or phenyl group, in particular a C1-C4 alkyl group, especially methyl, ethyl or both); - R which are unsubstituted or substituted and identical or different from each other 2 The group is C1-C 18 Alkoxy or C5-C 18 Cycloalkoxyl groups (preferably groups selected from C1-C8 alkoxyl and C5-C8 cycloalkoxyl, more preferably groups selected from C1-C4 alkoxyl, in particular methoxyl and ethoxyl), are particularly preferred without being limited to the above definition. corresponds to one of the following: In the case of mixtures of alkoxysilane polysulfides corresponding to formula (I) above, in particular the usual commercial mixtures, the average value of the "x" index is preferably between 2 and 5, more preferably a fraction of about 4. However, the invention can also be advantageously carried out using, for example, alkoxysilane disulfides (x=2).

[0020] Examples of silane polysulfides include, inter alia, bis((C1-C4)alkoxyl(C1-C4)alkylsilyl(C1-C4)alkyl)polysulfides (especially disulfides, trisulfides or tetrasulfides), such as bis(3-trimethoxysilylpropyl) or bis(3-triethoxysilylpropyl)polysulfide. Among these compounds, in particular bis(3-triethoxysilylpropyl)tetrasulfide, abbreviated as TESPT, of formula [(C2H5O)3Si(CH2)3S2]2, or bis(3-triethoxysilylpropyl)disulfide, abbreviated as TESPD, of formula [(C2H5O)3Si(CH2)3S]2, is used. Preferred examples also include bis(mono(C1-C4)alkoxyl-di(C1-C4)alkylsilylpropyl) polysulfides (in particular disulfides, trisulfides or tetrasulfides), especially bis(monoethoxydimethylsilylpropyl)tetrasulfide, as described in patent application WO 02 / 083782 (or U.S. Pat. No. 7,217,751).

[0021] Coupling agents other than alkoxysilane polysulfides include, in particular, difunctional POS (polyorganosiloxanes) or hydroxysilane polysulfides (R2 = OH in formula (I) above), as described in patent applications WO 02 / 30939 (or US Pat. No. 6,774,255) and WO 02 / 31041 (or US Patent Application Publication No. 2004 / 051210), or silanes or POS with azodicarbonyl functions, as described, for example, in patent applications WO 2006 / 125532, WO 2006 / 125533 and WO 2006 / 125534. Other examples of sulfurized silanes include, for example, silanes having at least one thiol (-SH) functional group (referred to as mercaptosilanes), at least one blocked thiol functional group, or both, as described, for example, in U.S. Pat. No. 6,849,754, WO 99 / 09036, WO 2006 / 023815, WO 2007 / 098080, WO 2008 / 055986, and WO 2010 / 072685 patents or patent applications. Of course, mixtures of the aforementioned coupling agents can also be used, as described in particular in the abovementioned patent application WO 2006 / 125534. According to a preferred embodiment of the present invention, at least one of the first rubber composition (FC), the second rubber composition (SC) or a combination thereof, in particular each rubber composition (FC and SC), comprises an inorganic reinforcing filler (preferably silica) and a coupling agent in an amount of 0.5-15% by mass per 100% by mass of the inorganic reinforcing filler (preferably silica).

[0022] According to a preferred embodiment of the present invention, at least one of the first rubber composition (FC), the second rubber composition (SC) or a combination thereof, in particular each rubber composition (FC and SC), comprises an inorganic reinforcing filler, preferably silica, and a coupling agent in an amount of less than 30 phr (for example between 0 phr and 30 phr), preferably less than 25 phr (for example between 0.2 phr and 25 phr), more preferably less than 20 phr (for example between 0.4 phr and 20 phr), even more preferably less than 15 phr (for example between 0.6 phr and 15 phr), in particular less than 10 phr (for example between 0.8 phr and 10 phr). According to a preferred embodiment of the present invention, at least one of the first rubber composition (FC), the second rubber composition (SC) or a combination thereof, in particular each rubber composition (FC and SC), comprises carbon black in an amount less than 15 phr (e.g. between 0 and 15 phr), preferably less than 10 phr (e.g. between 1 and 10 phr), more preferably up to 5 phr (e.g. between 2 and 5 phr). Within each of the above mentioned ranges of carbon black content in the rubber compositions (FC and SC), there is the benefit of the coloring properties (black pigmentation) and UV resistance properties of carbon black without the further adverse effect on the typical performance provided by inorganic reinforcing fillers, i.e. low hysteresis loss.

[0023] Suitable carbon blacks are all carbon blacks conventionally used in tires ("tire grade" blacks), such as reinforcing carbon blacks of the ASTM grade 100, 200 or 300 series (such as, for example, N115, N134, N234, N326, N330, N339, N347 or N375 blacks) or higher series carbon blacks of the ASTM grade 500, 600, 700 or 800 series (such as, for example, N550, N660, N683, N772, N774 blacks). The carbon black may already be incorporated in an elastomer matrix, such as a diene elastomer, for example in the form of a masterbatch (see, for example, applications WO 97 / 36724 or WO 99 / 16600). Each rubber composition (FC and SC) of the laminate of the article according to the invention is based on a plasticizer. The role of the plasticizer is to soften the matrix by diluting the elastomer and reinforcing fillers. The article according to the invention has the essential feature that the ratio of the phr amount of plasticizer to the reinforcing filler in the second rubber composition (SC) is higher than the ratio of the phr amount of plasticizer to the reinforcing filler in the first rubber composition (FC). For example, in the rubber composition (C-0) shown in Table 1, the phr amount of the plasticizer is 70 phr [= {55 phr (hydrocarbon resin 1) + 5 phr (liquid plasticizer 1) + 10 phr (liquid plasticizer 2)}], the phr amount of the reinforcing filler is 113 phr [= {3 phr (carbon black 1) + 110 phr (silica)}], and the ratio of the phr amount of the plasticizer to the reinforcing filler is 0.6 [= {55 phr (hydrocarbon resin 1) + 5 phr (liquid plasticizer 1) + 10 phr (liquid plasticizer 2)} / {3 phr (carbon black 1) + 110 phr (silica)}].

[0024] According to a preferred embodiment of the present invention, the ratio of the phr amount of plasticizer to the reinforcing filler in the second rubber composition (SC) is more than 3 / 2 times, preferably more than 2 times, the ratio of the phr amount of plasticizer to the reinforcing filler in the first rubber composition (FC). According to a preferred embodiment of the invention, for the first rubber composition (FC), the ratio of the phr amount of plasticizer to the reinforcing filler is less than 1.0, preferably less than 0.9, more preferably less than 0.8, even more preferably less than 0.7. A seventh aspect of the present invention is the article according to any one of the first to sixth aspects, wherein for the second rubber composition (SC), the ratio of the phr amount of plasticizer to the reinforcing filler is at least 1.0, preferably at least 1.1. According to a preferred embodiment of the invention, for the first rubber composition (FC), the amount of plasticizer is more than 30 phr, preferably more than 35 phr, more preferably more than 40 phr, even more preferably more than 45 phr, in particular more than 50 phr, especially more than 55 phr, even more especially more than 60 phr and advantageously more than 65 phr. According to a preferred embodiment of the invention, for the first rubber composition (FC), the amount of plasticizer is less than 110 phr, preferably less than 105 phr, more preferably less than 100 phr, even more preferably less than 95 phr, in particular less than 90 phr, in particular less than 85 phr, even more particularly less than 80 phr and advantageously less than 75 phr.

[0025] An eighth aspect of the present invention is the article according to any one of the first to seventh aspects, wherein for the second rubber composition (SC), the amount of plasticizer is at least 10 phr, preferably at least 15 phr, more preferably at least 20 phr, even more preferably at least 25 phr, in particular at least 30 phr, in particular at least 35 phr, even more particularly at least 40 phr, advantageously at least 45 phr, more advantageously at least 50 phr, more advantageously at least 55 phr, even more advantageously at least 60 phr, in particular at least 65 phr, and more particularly at least 70 phr.

[0026] According to a preferred embodiment of the invention, for the second rubber composition (SC), the amount of plasticizer is at most 140 phr, preferably at most 130 phr, more preferably at most 120 phr, even more preferably at most 110 phr, in particular at most 100 phr and especially at most 90 phr. Any liquid plasticizer known for its plasticizing properties with respect to elastomer matrices, such as any extending oil, diene elastomers, regardless of aromatic or non-aromatic nature, can be used as liquid plasticizer to soften the matrix by diluting the elastomers and reinforcing fillers. Note that at ambient temperature (20°C) under atmospheric pressure, these plasticizers or oils, of higher or lower viscosity, are liquids (i.e., substances capable of ultimately assuming the shape of their container), in contrast to the plasticization of hydrocarbon resins, which are essentially solid at ambient temperature (20°C) under atmospheric pressure. According to a preferred embodiment of the present invention, the plasticizer comprises a liquid plasticizer selected from the group consisting of liquid diene polymers, polyolefin oils, naphthenic oils, paraffinic oils, distillate aromatic extract (DAE) oils, medium extract solvates (MES), treated distillate aromatic extract (TDAE) oils, residual aromatic extract (RAE) oils, treated residual aromatic extract (TRAE) oils, safe residual aromatic extract (SRAE) oils, mineral oils, vegetable oils, ether plasticizers, ester plasticizers, phosphate plasticizers, sulfonate plasticizers, and combinations thereof.

[0027] Hydrocarbon resins are polymers well known to those skilled in the art that are essentially based on carbon and hydrogen and therefore essentially miscible in rubber compositions, such as diene elastomer compositions. They can be aliphatic or aromatic, or of the aliphatic / aromatic type, i.e. based on aliphatic, aromatic or both monomers. They can be natural or synthetic, and may or may not be petroleum-based (in which case they are also known as petroleum resins). They are preferably exclusively hydrocarbon, i.e. they contain only carbon and hydrogen atoms. Preferably, such a "plasticizing" hydrocarbon resin has the following properties: - a Tg of more than 20°C (e.g., between 20°C and 400°C), preferably more than 30°C (e.g., between 30°C and 300°C), more preferably more than 40°C (e.g., between 40°C and 200°C); DSC , - a number average molecular weight (Mn) between 400 and 2000 g / mol (more preferably between 500 and 1500 g / mol); - a polydispersity index (PI) of less than 3, more preferably less than 2 (note that PI=Mw / Mn, where Mw is the weight average molecular weight); The present invention exhibits at least one, and more preferably all, of the following: The macrostructure (Mw, Mn and PI) of the hydrocarbon resins is determined by steric exclusion chromatography (SEC): solvent tetrahydrofuran; temperature 35°C; concentration 1 g / l; flow rate 1 ml / min; solution filtered through a filter of 0.45 μm porosity before injection; Moore calibration with polystyrene standards; a set of three "Waters" columns ("Styragel" HR4E, HR1 and HR0.5) in sequence; a differential refractometer ("Waters 2410") and its associated operating software ("Waters Empower").

[0028] According to a preferred embodiment of the present invention, the plasticizer comprises a hydrocarbon resin selected from the group consisting of cyclopentadiene (abbreviated as CPD) homopolymer or copolymer resin, dicyclopentadiene (abbreviated as DCPD) homopolymer or copolymer resin, terpene homopolymer or copolymer resin, C5 fraction homopolymer or copolymer resin, C9 fraction homopolymer or copolymer resin, alpha-methylstyrene homopolymer or copolymer resin and combinations thereof. Among the above copolymer resins, it is more preferable to use those selected from the group consisting of (D)CPD / vinyl aromatic copolymer resin, (D)CPD / terpene copolymer resin, (D)CPD / C5 fraction copolymer resin, (D)CPD / C9 fraction copolymer resin, terpene / vinyl aromatic copolymer resin, terpene / phenol copolymer resin, C5 fraction / vinyl aromatic copolymer resin, C9 fraction / vinyl aromatic copolymer resin and combinations thereof.

[0029] The term "terpene" here refers to the known combination of the α-pinene, β-pinene and limonene monomers, with preference being given to using the limonene monomer, which compound exists in known manner in the form of three possible isomers: L-limonene (levorotatory enantiomer), D-limonene (dextrorotatory enantiomer) or dipentene, which is a racemate of the dextrorotatory and levorotatory enantiomers. Styrene, α-methylstyrene, ortho-, meta- or para-methylstyrene, vinyltoluene, para-(tert-butyl)styrene, methoxystyrene, chlorostyrene, hydroxystyrene, vinylmesitylene, divinylbenzene, vinylnaphthalene or the C9 fraction (or more generally the C8-C 10 Any vinyl aromatic monomer obtained from the C9 fraction (or more generally the C8-C9 fraction) is suitable as the vinyl aromatic monomer, for example. Preferably, the vinyl aromatic compound is styrene or a vinyl aromatic compound obtained from the C9 fraction (or more generally the C8-C9 fraction). 10 Preferably, the vinyl aromatic compound is the minor monomer, expressed as a mole fraction, in the copolymer under consideration.

[0030] The above preferred resins are well known to those skilled in the art and are commercially available, for example: - Polylimonene resin: "Dercolyte L120" (Mn=625g / mol; Mw=1010g / mol; PI=1.6; Tg DSC = 72 °C) by DRT or "Sylvagum TR7125C" (Mn = 630 g / mol; Mw = 950 g / mol; PI = 1.5; Tg DSC =70°C) by Arizona Chemical Company, - C5 fraction / vinyl aromatics, in particular C5 fraction / styrene or C5 fraction / C9 fraction, copolymer resins: "Super Nevtac 78", "Super Nevtac 85" or "Super Nevtac 99" by Neville Chemical Company, "Wingtack Extra" by Goodyear Chemicals, "Hikorez T1095" and "Hikorez T1100" by Kolon or "Escorez 2101" and "ECR 373" by Exxon; - Limonene / styrene copolymer resins: "Dercolyte TS 105" by DRT or "ZT115LT" and "ZT5100" by Arizona Chemical Company It is.

[0031] Other preferred resins may also include phenol-modified α-methylstyrene resins. It should be noted that to characterize these phenol-modified resins, a number called "hydroxyl number" (measured according to standard ISO 4326 and expressed in mg KOH / g) is used in a known manner. α-Methylstyrene resins, especially those modified with phenols, are well known to those skilled in the art and are available, for example, from "Sylvares SA 100" (Mn=660 g / mol; PI=1.5; Tg DSC =53℃); "Sylvares SA 120" (Mn=1030g / mol;PI=1.9;TgDSC =64℃); "Sylvares 540" (Mn=620g / mol;PI=1.3;Tg DSC = 36 °C; hydroxyl number = 56 mg KOH / g); and "Sylvares 600" (Mn = 850 g / mol; PI = 1.4; Tg DSC = 50°C; Hydroxyl Number = 31 mg KOH / g) sold by Arizona Chemical Company.

[0032] According to a preferred embodiment of the present invention, for the first rubber composition (FC), the plasticizer comprises mainly a hydrocarbon resin, i.e. the plasticizer comprises more than 50% by mass of a hydrocarbon resin per 100% by mass of plasticizer, preferably the plasticizer comprises more than 60% by mass, more preferably more than 70% by mass, even more preferably more than 80% by mass, in particular more than 90% by mass of a hydrocarbon resin per 100% by mass of plasticizer. A ninth aspect of the present invention is the article according to any one of the first to eighth aspects, wherein for the second rubber composition (SC), the plasticizer comprises mainly a hydrocarbon resin, i.e. the plasticizer comprises more than 50% by mass of hydrocarbon resin per 100% by mass of plasticizer, preferably the plasticizer comprises more than 60% by mass, more preferably more than 70% by mass, even more preferably more than 80% by mass, in particular more than 90% by mass of hydrocarbon resin per 100% by mass of plasticizer. A tenth aspect of the present invention is the article according to any one of the first to ninth aspects, wherein the average glass transition temperature of the combination of the elastomer matrix and the plasticizer in the second rubber composition (SC) is higher than the average glass transition temperature of the combination of the elastomer matrix and the plasticizer in the first rubber composition (FC). The average glass transition temperature is calculated using the FOX formula (Tg DSC平均 +273) -1 =Σ(w i / (Σ(w i )) / (Tg DSCi +273)). DSC平均 : average glass transition temperature, w i : phr amount of the i-th component in the elastomer matrix and plasticizer; Tg DSCi: the glass transition temperature in °C of the i-th component.

[0033] For example, in the rubber composition (C-0) shown in Table 1, the components are BR, SBR 1, hydrocarbon resin 1, liquid plasticizer 1 and liquid plasticizer 2. According to a preferred embodiment of the invention, for the first rubber composition (FC), the average glass transition temperature of the combination of the elastomeric matrix and the plasticizer is below -35°C. According to a preferred embodiment of the invention, for the first rubber composition (FC), the average glass transition temperature of the combination of the elastomeric matrix and the plasticizer is greater than -110°C. An eleventh aspect of the present invention is the article according to any one of the first to tenth aspects, wherein, for the second rubber composition (SC), the average glass transition temperature of the combination of the elastomer matrix and the plasticizer is −35° C. or higher, preferably −30° C. or higher, and more preferably −25° C. or higher. According to a preferred embodiment of the invention, for the second rubber composition (SC), the average glass transition temperature of the combination of elastomeric matrix and plasticizer is at most 35°C, preferably at most 30°C, more preferably at most 25°C, even more preferably at most 20°C, in particular at most 15°C, especially at most 10°C, more especially at most 5°C and advantageously at most 0°C.

[0034] Each rubber composition (FC and SC) of the laminate of the article according to the invention is based on a sulfur-based vulcanization accelerator. Sulfur-based vulcanization accelerators, which accelerate the sulfur vulcanization reaction, are vulcanization accelerators based on at least one sulfur atom in the molecule. The sulfur-based vulcanization accelerator can accelerate the sulfur vulcanization reaction in each rubber composition (FC and SC). The article according to the invention has the essential feature that the phr amount of the sulfur-based vulcanization accelerator in the second rubber composition (SC) is lower than the phr amount of the sulfur-based vulcanization accelerator in the first rubber composition (FC).

[0035] According to a preferred embodiment of the present invention, the phr amount of the sulfur-based vulcanization accelerator in the first rubber composition (FC) is at most 10 phr, preferably at most 9.0 phr, more preferably at most 8.0 phr, even more preferably at most 7.0 phr, in particular at most 6.0 phr, in particular at most 5.0 phr, even more particularly at most 4.0 phr, advantageously at most 3.0 phr. According to a preferred embodiment of the present invention, the phr amount of the sulfur-based vulcanization accelerator in the first rubber composition (FC) is at least 1.5 phr, preferably at least 1.6 phr, more preferably at least 1.7 phr, even more preferably at least 1.8 phr, in particular at least 1.9 phr, in particular at least 2.0 phr, even more particularly at least 2.1 phr, advantageously at least 2.2 phr.

[0036] A twelfth aspect of the present invention is the article according to any one of the first to eleventh aspects, wherein the phr amount of the sulfur-based vulcanization accelerator in the second rubber composition (SC) is less than 1.5 phr, preferably less than 1.4 phr, more preferably less than 1.3 phr, even more preferably less than 1.2 phr, in particular less than 1.1 phr, and especially less than 1.0 phr. According to a preferred embodiment of the present invention, for the second rubber composition (SC), the amount of sulfur-based vulcanization accelerator is more than 0.1 phr, preferably more than 0.2 phr, more preferably more than 0.3 phr, even more preferably more than 0.4 phr, in particular more than 0.5 phr, in particular more than 0.6 phr, even more particularly more than 0.7 phr and advantageously more than 0.8 phr. According to a preferred embodiment of the present invention, the sulfur-based vulcanization accelerator is a sulfenamide type vulcanization accelerator (e.g., N-cyclohexyl-2-benzothiazole sulfenamide (CBS), N-tert-butyl-2-benzothiazole sulfenamide (TBBS), 2-(morpholinothio)benzothiazole (MBS), N,N-dicyclohexyl-2-benzothiazole sulfenamide (DCBS), N-tert-butyl-2-benzothiazole sulfenamide (TBSI)). , based on thiazole type accelerators (e.g., 2,2'-dithiobisbenzothiazole (MBTS), zinc 2-mercaptobenzothiazole (ZMBT)), thiourea type accelerators, thiuram type accelerators (e.g., tetrabenzylthiuram disulfide (TBzTD)), dithiocarbamate type accelerators (e.g., zinc ethylphenyldithiocarbamate (ZEPC), zinc dibenzyldithiocarbamate (ZDBzC)), or combinations thereof.

[0037] According to a preferred embodiment of the present invention, at least one of the first rubber composition (FC), the second rubber composition (SC) or a combination thereof, in particular each rubber composition, is further based on a vulcanization accelerator other than a sulfur-based vulcanization accelerator, preferably the vulcanization accelerator other than the sulfur-based vulcanization accelerator is based on a guanidine derivative or a combination thereof, more preferably the vulcanization accelerator other than the sulfur-based vulcanization accelerator is based on diphenylguanidine. Vulcanization accelerators other than the sulfur-based vulcanization accelerators can accelerate the vulcanization reaction in each rubber composition (FC and SC).

[0038] According to a preferred embodiment of the invention, at least one of the rubber compositions (FC and SC), in particular each rubber composition, is further based on a vulcanization activator, preferably a vulcanization accelerator based on zinc (in particular pure zinc, zinc derivatives (e.g. zinc fatty acid salts) or combinations thereof), fatty acids (in particular stearic acid) or combinations thereof. Vulcanization activators may increase the efficiency of vulcanization accelerators that are based on sulfur-based vulcanization accelerators, vulcanization accelerators other than sulfur-based vulcanization, or combinations thereof.

[0039] A thirteenth aspect of the present invention is the article according to any one of the first to twelfth aspects, wherein each of the rubber compositions (FC and SC) is further based on sulfur, and the phr amount of sulfur in the second rubber composition (SC) is lower than the phr amount of sulfur in the first rubber composition (FC). The sulfur is a vulcanizing agent, i.e., vulcanizing sulfur, which may be based on sulfur, sulfur derived from a sulfur donor, or a combination thereof. According to a preferred embodiment of the thirteenth aspect, the phr amount of sulfur in each rubber composition (FC and SC) is less than 10 phr, preferably less than 3.0 phr. According to a preferred embodiment of the thirteenth aspect, the phr amount of sulfur in each rubber composition (FC and SC) is greater than 0.1 phr, preferably greater than 0.5 phr.

[0040] According to a preferred embodiment of the present invention, at least one of the first rubber composition (FC), the second rubber composition (SC) or a combination thereof, in particular each rubber composition, is further based on a vulcanizing agent other than sulfur, preferably the vulcanizing agent other than sulfur is a peroxide, a bismaleimide or a combination thereof. Each rubber composition (FC and SC) of the laminate of the article according to the invention may be based in whole or in part on the usual additives commonly used in elastomeric compositions, such as protective agents, such as anti-ozone waxes, chemical antiozonants, antioxidants, tackifying resins, methylene acceptors (such as phenolic novolac resins) or methylene donors (such as hexamethylenetetramine (HMT) or hexamethoxymethylmelamine (H3M)), or combinations thereof.

[0041] Each rubber composition (FC and SC) of the laminate according to the invention can be manufactured in a suitable mixer using two successive preparation stages well known to those skilled in the art: a first stage (called "non-productive" stage) of thermomechanical processing or kneading at high temperature up to a maximum temperature between 110°C and 190°C, preferably between 130°C and 180°C, followed by a second stage (called "productive" stage) of mechanical processing at a lower temperature, typically below 110°C, for example between 40°C and 100°C, i.e. a finishing stage in which a sulfur-based vulcanization accelerator is incorporated, preferably a finishing stage in which a sulfur-based vulcanization accelerator and at least one of sulfur, peroxide, bismaleimide, vulcanization retarder or a combination thereof are incorporated. A method that can be used for the preparation of each such composition (FC and SC) preferably comprises, for example, the following steps: - during a first stage (called the "non-productive" stage), incorporating reinforcing fillers and plasticizers into the elastomeric matrix in a mixer and kneading everything thermomechanically (for example in one or more steps) until a maximum temperature between 110°C and 190°C is reached; - cooling the combined mixture to a temperature below 100°C; - then, during a second stage (called the "production" stage), incorporating a sulfur-based vulcanization accelerator, preferably a sulfur-based vulcanization accelerator and at least one of sulfur, peroxide, bismaleimide, vulcanization retarder or a combination thereof; and - Mix everything together to a maximum temperature of less than 110°C Includes.

[0042] By way of example, the first (non-productive) stage can be carried out in a single thermomechanical stage during which all the necessary components are introduced into a suitable mixer, such as a standard internal mixer, followed by a second step, after mixing for, for example, 1-2 minutes, in which the other additives, any additional fillers-coatings or processing aids, except for the sulfur-based vulcanization accelerator (and at least one of sulfur, peroxide, bismaleimide, vulcanization retarder or combinations thereof), are introduced. The total mixing time in this non-productive stage is preferably between 1 and 15 minutes. After cooling the mixture thus obtained, the sulfur-based vulcanization accelerator (and at least one of sulfur, peroxide, bismaleimide, vulcanization retarder or combinations thereof) can then be incorporated at low temperature (for example between 40° C. and 100° C.), generally in an external mixer such as an open mill, and the combined mixture is then mixed for several minutes, for example between 2 and 15 minutes (second (production) stage). Each final composition thus obtained is then extruded or calendered, for example in the form of sheets or plaques, in particular for laboratory characterization, or extruded in the form of rubber profiled elements which can be used directly as laminates in articles such as tire treads. The laminate of the article according to the invention comprises at least two overlapping parts, comprising a first part (FP) made of a first rubber composition (FC) and a second part (SP) made of a second rubber composition (SC).

[0043] For the preparation of the laminate of the article according to the invention, it is possible to construct a first layer (as the first part (FP)) of a homogeneous rubber composition (as the first rubber composition (FC)) and a second layer (as the second part (SP)) of a homogeneous rubber composition (as the second rubber composition (SC)), and then superimpose the first layer on the second layer to obtain the laminate. According to a preferred embodiment of the invention, the second part (SP) made from the second rubber composition (SC) is adjacent to the first part (FP) made from the first rubber composition (FC). The article according to the invention is intended to come into contact with the ground, and the second part (SP) of the article's laminate is located further from the ground than the first part (FP), i.e. the first part (FP) is positioned closer to the ground than the second part (SP). The second part (SP) of the laminate of the article according to the invention is further from the ground than the first part (FP).

[0044] A 14th aspect of the present invention is an article according to any one of the first to 13th aspects, wherein the first part (FP) is intended to come into contact with the ground during the useful life of the article, preferably the first part (FP) and the second part (SP) are intended to come into contact with the ground during the useful life of the article, i.e. the second part (SP) is also intended to come into contact with the ground during use of the article after the first part (FP) has worn away. According to another preferred embodiment of the invention, the first part (FP) is intended to come into contact with the ground during the life of the article, whereas the second part (SP) is not intended to come into contact with the ground during the life of the article. Useful life refers to the period for which an article is in use (e.g., if the article is a tire, it is the period from the article's new condition to its final condition, which means when the wear indicator bar in the tire's tread is reached).

[0045] According to a preferred embodiment of the invention, the article is a tire, a shoe or a caterpillar track, and preferably the laminate of the article is comprised in a tire tread, a shoe or a caterpillar track. A fifteenth aspect of the present invention is the article according to any one of the first to fourteenth aspects, wherein the article is a tire, and preferably the laminate is included in a tire tread. According to a preferred embodiment of the fifteenth aspect, the article is a tire comprising several tire portions, which are a tread intended to be at least partially in contact with the ground, two sidewalls intended to be in contact with the outside air but not with the ground, two beads, a crown extended by the two sidewalls ending in the two beads, a carcass reinforcement formed in at least one ply reinforced by radial textile cards, the carcass reinforcement penetrating the crown and the sidewalls, the carcass reinforcement being fixed to the two beads, preferably further comprising a crown reinforcement arranged between the carcass reinforcement and the tread, more preferably further comprising an inner liner intended to protect the carcass reinforcement from the diffusion of air from the space inside the tire, the inner liner being arranged radially inward from the carcass reinforcement. "Radial" means radially, that is, perpendicular to the axis of rotation of the tire. According to a preferred embodiment of the fifteenth aspect, the tyre is in particular intended to equip passenger motor vehicles, including 4x4 (four wheel drive) vehicles and SUV (sports utility vehicle) vehicles, as well as industrial vehicles, in particular selected from vans and large vehicles, i.e. buses or large road transport vehicles (lorries, tractors, trailers)).

[0046] Vulcanization (or curing) is carried out in a known manner, generally at temperatures between 110°C and 190°C, for a sufficient period of time which may vary, for example, between 5 and 90 minutes, depending inter alia on the cure temperature, the vulcanization system employed and the vulcanization kinetics of the composition under consideration. The present invention relates to the above rubber compositions, laminates, articles, tires and tire treads in both the raw state (i.e., before curing) and the cured state (i.e., after crosslinking or vulcanization). The invention is further illustrated by the following non-limiting examples. EXAMPLES

[0047] Four rubber compositions (C-0 to C-3) were used to confirm the effect of the present invention. The rubber compositions are based on a diene elastomer (as elastomer matrix, a blend of SBR and BR or only IR), reinforced with a blend of silica and carbon black (as reinforcing filler), a hydrocarbon resin, a liquid plasticizer or both (as plasticizer), and N-dicyclohexyl-2-benzothiazole sulfenamide (as sulfur-based vulcanization accelerator, abbreviated as "CBS"). The formulation of the rubber compositions is shown in Table 1 with the amounts of the various products expressed in phr. The respective ratios of phr amounts of plasticizer to reinforcing filler and the respective average glass transition temperatures of the combinations of elastomer matrix and plasticizer are also shown in Table 1. Each rubber composition was prepared as follows: the reinforcing fillers, the plasticizers, the elastomeric matrix and the various other components, except for the sulfur and sulfur-based vulcanization accelerators (and also the vulcanization retarder in the case of C-0, abbreviated as "CTP"), were successively introduced into an internal mixer having an initial vessel temperature of about 60°C; the mixer was thus filled to about 70% (volume %). A thermomechanical processing (non-productive phase) was then carried out in one step, lasting about 3-4 minutes in total, until a maximum "drop" temperature of 165°C was reached. The mixture thus obtained was recovered and cooled, then the sulfur and sulfenamide type vulcanization accelerators (and also the CTP in the case of C-0) were incorporated in an external mixer (homofinisher) at 20-30°C, and everything was mixed (productive phase) for an appropriate time (for example between 5 and 12 minutes).

[0048] The rubber compositions thus obtained were then calendered in order to measure their physical or mechanical properties, either in the form of sheets (2-3 mm thick) or fine sheets of rubber, or in the form of profiled elements which can be used directly after cutting to the desired dimensions, assembly or both, for example as tire semi-finished products, in particular tire treads. Furthermore, four tires (T-0: Comparative Example, T-1: Reference, T-2 and T-3: Examples according to the invention) are compared, each having a tread including a laminate including a radially outer portion made of a first rubber composition and a radially inner portion made of a second rubber composition, the radially outer portion being adjacent to the radially inner portion, the laminate being manufactured by overlapping sheets of the first rubber composition (C-0) and the second rubber composition (C-0, C-1, C-2 and C-3), as shown in Table 2.

[0049] The tires, having a tread including circumferentially, axially, or both extending grooves, were conventionally manufactured and were identical in all respects except for the rubber composition and laminate of the tire tread. The tires were radial carcass passenger tires and their size was 235 / 45R18. To evaluate road noise performance, a 2500cc passenger car was fitted with the same type of tires on all four wheels and a microphone was placed next to the passenger's ear near the window. The car was driven on a straight road on weathered asphalt at a constant speed of 80kph, the interior noise was measured using the microphone, and the A-weighted sound pressure level from 50 to 500Hz was calculated. The results, shown in Table 2, are expressed as the difference in dB(A) relative to the reference (T-1), with lower values ​​indicating better performance. The results in Table 2 demonstrate that the examples according to the invention (T-2 and T-3) have better road noise performance values ​​than the comparative examples and the reference (T-0 or T-1). In conclusion, the article according to the invention allows for improved road noise performance.

[0050] [Table 1-1]

[0051] [Table 1-2]

[0052] [Table 2]

Claims

1. An article intended to come into contact with the ground, The article, A first part (FP) made from a first rubber composition (FC); a second part (SP) made from a second rubber composition (SC); and a laminate including at least two overlapping portions comprising: The second portion (SP) is located farther from the ground than the first portion (FP), Each of the rubber compositions (FC and SC) comprises at least Elastomeric matrix, Reinforcing fillers, Plasticizers and Sulfur-based vulcanization accelerator Based on The phr amount of the reinforcing filler in the second rubber composition (SC) is less than the phr amount of the reinforcing filler in the first rubber composition (FC); a ratio of the phr amount of the plasticizer to the reinforcing filler in the second rubber composition (SC) is higher than a ratio of the phr amount of the plasticizer to the reinforcing filler in the first rubber composition (FC); The phr amount of the sulfur-based vulcanization accelerator in the second rubber composition (SC) is less than the phr amount of the sulfur-based vulcanization accelerator in the first rubber composition (FC); Goods.

2. 2. The article of claim 1, wherein at least one of the first rubber composition (FC), the second rubber composition (SC) or a combination thereof is such that the elastomeric matrix comprises at least one diene elastomer selected from the group consisting of polybutadiene, polyisoprene, butadiene copolymers, isoprene copolymers and combinations thereof, and preferably each of the rubber compositions (FC and SC) is such that the elastomeric matrix comprises at least one diene elastomer selected from the group consisting of polybutadiene, polyisoprene, butadiene copolymers, isoprene copolymers and combinations thereof.

3. 3. The article according to claim 1 or 2, wherein said second rubber composition (SC) is such that said elastomeric matrix comprises at least 50 phr of polyisoprene.

4. The article according to any one of claims 1 to 3, wherein the second rubber composition (SC) has an amount of the reinforcing filler of up to 110 phr.

5. The article according to any one of claims 1 to 4, wherein the second rubber composition (SC) has an amount of the reinforcing filler of at least 15 phr.

6. The second rubber composition (SC) is one in which the reinforcing filler mainly contains an inorganic reinforcing filler, preferably, the second rubber composition (SC) is one in which the inorganic reinforcing filler mainly contains silica. The article according to any one of claims 1 to 5.

7. The article according to any one of claims 1 to 6, wherein the second rubber composition (SC) has a ratio of the phr amount of the plasticizer to the reinforcing filler of at least 1.

0.

8. The article according to any one of claims 1 to 7, wherein the second rubber composition (SC) has an amount of the plasticizer of at least 10 phr.

9. The article according to any one of claims 1 to 8, wherein the second rubber composition (SC) is one in which the plasticizer mainly contains a hydrocarbon resin.

10. The article according to any one of claims 1 to 9, wherein the average glass transition temperature of the combination of the elastomer matrix and the plasticizer in the second rubber composition (SC) is higher than the average glass transition temperature of the combination of the elastomer matrix and the plasticizer in the first rubber composition (FC).

11. The article according to any one of claims 1 to 10, wherein the second rubber composition (SC) has an average glass transition temperature of -35°C or higher when combined with the elastomer matrix and the plasticizer.

12. The article according to any one of claims 1 to 11, wherein the phr amount of the sulfur-based vulcanization accelerator in the second rubber composition (SC) is less than 1.5 phr.

13. The article according to any one of claims 1 to 12, wherein each of the rubber compositions (FC and SC) is further based on sulfur, and the phr amount of sulfur in the second rubber composition (SC) is less than the phr amount of sulfur in the first rubber composition (FC).

14. The article according to any one of claims 1 to 13, wherein the first part (FP) is intended to come into contact with the ground during the useful life of the article, preferably the first part (FP) and the second part (SP) are intended to come into contact with the ground during the useful life of the article.

15. The article of any one of claims 1 to 14, wherein the article is a tire, preferably the laminate is comprised in a tire tread.