WO2008145277A1 - Objet pneumatique pourvu d'une couche etanche aux gaz a base d'un elastomere thermoplastique et d'une huile polybutene - Google Patents
Objet pneumatique pourvu d'une couche etanche aux gaz a base d'un elastomere thermoplastique et d'une huile polybutene Download PDFInfo
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- WO2008145277A1 WO2008145277A1 PCT/EP2008/004025 EP2008004025W WO2008145277A1 WO 2008145277 A1 WO2008145277 A1 WO 2008145277A1 EP 2008004025 W EP2008004025 W EP 2008004025W WO 2008145277 A1 WO2008145277 A1 WO 2008145277A1
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- Prior art keywords
- elastomer
- pneumatic object
- styrene
- pneumatic
- object according
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/08—Copolymers of styrene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C1/0008—Compositions of the inner liner
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C5/00—Inflatable pneumatic tyres or inner tubes
- B60C5/12—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim
- B60C5/14—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
- C08L23/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
- C08L23/22—Copolymers of isobutene; Butyl rubber ; Homo- or copolymers of other iso-olefins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
- C08L53/025—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes modified
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
- C08L23/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
Definitions
- the present invention relates to "pneumatic" objects, i.e., by definition, objects that take their usable form when inflated with air or an equivalent inflation gas.
- the radially inner face has an airtight layer (or more generally any inflation gas) which allows the swelling and maintaining the pressure of the tire.
- airtight layer or more generally any inflation gas
- Its sealing properties enable it to guarantee a relatively low rate of pressure loss, making it possible to maintain the swollen bandage in normal operating condition for a sufficient duration, normally of several weeks or several months. It also serves to protect the carcass reinforcement from the diffusion of air from the interior space to the bandage.
- inner liner waterproof inner liner
- compositions based on rubber or butyl elastomer are well-known disadvantages of compositions based on rubber or butyl elastomer.
- they have significant hysteretic losses, moreover over a wide temperature spectrum, a disadvantage that penalizes the rolling resistance of tires.
- the present invention relates to a pneumatic object provided with an elastomeric layer impervious to inflation gases such as air, characterized in that said elastomer layer comprises at least one thermoplastic copolymer elastomer with polystyrene and polyisobutylene blocks (hereinafter also referred to as "block copolymer” or “block elastomer”) and a polybutene oil.
- the polybutene oil is a polyisobutylene oil (abbreviated as "PIB”) and the block copolymer is a styrene / isobutylene / styrene copolymer (abbreviated "SIBS").
- PIB polyisobutylene oil
- SIBS styrene / isobutylene / styrene copolymer
- such a block copolymer has the major advantage, because of its thermoplastic nature, to be able to be worked as is in the molten state (liquid), and therefore to offer a possibility of implementation simplified, while the addition of polybutene oil improves the integration of the elastomeric layer in the pneumatic object, by a lowering of the module and an increase in the tackifying power of the latter, without unacceptable penalty for sealing.
- the invention particularly relates to pneumatic objects of rubber such as pneumatic tires, or inner tubes, in particular tubes for pneumatic tires.
- the invention relates more particularly to pneumatic tires intended for equipping tourism-type motor vehicles, SUVs ("Sport Utility Vehicles"), two wheels (in particular motorcycles), planes, such as industrial vehicles chosen from light trucks, "heavy vehicles "- that is, metros, buses, road transport vehicles (trucks, tractors, trailers), off-the-road vehicles such as agricultural or civil engineering machinery - other transport or handling vehicles.
- SUVs Sport Utility Vehicles
- two wheels in particular motorcycles
- planes such as industrial vehicles chosen from light trucks, "heavy vehicles "- that is, metros, buses, road transport vehicles (trucks, tractors, trailers), off-the-road vehicles such as agricultural or civil engineering machinery - other transport or handling vehicles.
- the invention also relates to a method for sealing a pneumatic object vis-à-vis the inflation gases, wherein is incorporated in said pneumatic object during its manufacture, or is added to said pneumatic object after its manufacture, a gas-tight elastomeric layer as defined above.
- the invention also relates to the use as an inflation-tight layer, in a pneumatic object, of an elastomeric layer as defined above.
- 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 the strict limits a and b).
- thermoplastic copolymer elastomer with polystyrene and polyisobutylene blocks must be understood any thermoplastic copolymer comprising at least one polystyrene block (ie one or more polystyrene blocks). ) and at least one polyisobutylene block (i.e. one or more polyisobutylene blocks), to which other blocks (eg polyethylene and / or polypropylene) and / or other monomer units (e.g. for example unsaturated units such as dienic).
- such a block copolymer is a styrene / isobutylene / styrene triblock copolymer (abbreviated as "SIBS").
- SIBS styrene / isobutylene / styrene triblock copolymer
- 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 block elastomer such as SIBS above is, in a known manner, part of the family of thermoplastic elastomers (abbreviated as "TPE”), more specifically thermoplastic styrene elastomers (abbreviated to "TPS").
- TPE thermoplastic elastomers
- TPS thermoplastic styrene elastomers
- the TPS elastomers are generally in the form of block copolymers based on styrene.
- intermediate structure between thermoplastic polymers and elastomers they consist of rigid polystyrene blocks connected by flexible elastomer blocks, for example polybutadiene, polyisoprene, poly (ethylene / butylene), or else polyisobutylene in the case for example of the block elastomer than SIBS.
- each of these segments or blocks contains at least more than 5, usually more than 10 base units (for example styrene and isobutylene for SIBS).
- the weight content of styrene in the block copolymer such as SIBS is between 5% and 50%.
- the thermoplastic nature of the block elastomer may significantly decrease while above the maximum recommended, the elasticity of the seal layer may be affected.
- the styrene content is more preferably between 10 and 40%, in particular between 15 and 35%.
- styrene is meant in the present description any monomer containing styrene, unsubstituted as substituted; among the substituted styrenes may be mentioned, for example, methylstyrenes (for example ⁇ -methylstyrene, ⁇ -methylstyrene, ⁇ -methylstyrene, tert-butylstyrene) and chlorostyrenes (for example monochlorostyrene, dichlorostyrene).
- methylstyrenes for example ⁇ -methylstyrene, ⁇ -methylstyrene, ⁇ -methylstyrene, tert-butylstyrene
- chlorostyrenes for example monochlorostyrene, dichlorostyrene
- the glass transition temperature (Tg, measured according to ASTM D3418) of the block elastomer is less than -20 ° C, more preferably less than -40 ° C.
- Tg glass transition temperature
- a value of Tg higher than these minima can reduce the performance of the waterproof layer during use at very low temperatures; for such use, the Tg of the block elastomer is more preferably still less than -50 ° C.
- the number-average molecular weight (denoted Mn) of the block elastomer is preferably between 30,000 and 500,000 g / mol, more preferentially between 40,000 and 400,000 g / mol.
- Mn number-average molecular weight
- the number-average molecular weight (Mn) of the block elastomer is determined in known manner by steric exclusion chromatography (SEC).
- SEC steric exclusion chromatography
- the sample is first solubilized in tetrahydrofuran at a concentration of about 1 g / l; then the solution is filtered on a 0.45 ⁇ m porosity filter before injection.
- the equipment used is a chromatographic chain "WATERS alliance".
- the elution solvent is tetrahydrofuran, the flow rate 0.7 ml / min, the system temperature 35 ° C and the analysis time 90 min.
- a set of four WATERS columns in series, of trade names "STYRAGEL"("HMW7",”HMW6E” and two “HT6E") is used.
- the injected volume of the solution of the polymer sample is 100 ⁇ l.
- 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 block elastomer, extended with the polybutene oil, can constitute by itself the gas-tight elastomeric layer or be associated in this elastomeric layer with other elastomers.
- the block elastomer constitutes the majority elastomer by weight; it then preferably represents more than 50%, more preferably more than 70% by weight of all the elastomers present in the elastomer composition or layer.
- Such complementary elastomers which are minor in weight, could be, for example, diene elastomers such as natural rubber or synthetic polyisoprene, butyl rubber or thermoplastic styrene elastomers (TPS) other than a block elastomer such as SIBS, within the limit the compatibility of their microstructures.
- TPS elastomer other than a block elastomer such as SIBS usable in addition to the latter, mention may be made in particular of a TPS elastomer selected from the group consisting of styrene / butadiene / styrene block copolymers, styrene block copolymers / isoprene / styrene, styrene / isoprene / butadiene / styrene block copolymers, styrene / ethylene / butylene / styrene block copolymers, styrene / ethylene / propylene / styrene block copolymers, styrene / ethylene / ethylene / propylene / styrene block copolymers and mixtures of these copolymers.
- said optional additional TPS elastomer is selected from the group consisting of styrene / ethylene / butylene / block copolymers. styrene, styrene / ethylene / propylene / styrene block copolymers and mixtures of these copolymers.
- the block elastomer such as SIBS is the only elastomer, and the only thermoplastic elastomer present in the gas-tight elastomeric composition or layer.
- Block elastomers such as SIBS can be implemented in a conventional manner for TPE, by extrusion or molding, for example from a raw material available in the form of beads or granules.
- SIBS elastomers for example are commercially available, for example sold by KANEKA under the name "SIBSTAR" (e.g. "Sibstar 102T", “Sibstar 103T” or “Sibstar 073T”). For example, they have been described, as well as their synthesis, in patent documents EP 731 112, US Pat. No. 4,946,899 and US Pat. No. 5,260,383. They were first developed for biomedical applications and then described in various applications specific to elastomers. TPE, as varied as medical equipment, parts for automobiles or household appliances, sheaths 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) .
- the block elastomer such as SIBS previously described is used in a composition which also comprises, as plasticizer, an extender oil (or plasticizing oil) whose function is to facilitate the implementation, particularly the integration in the pneumatic object by a lowering of the module and an increase in tackiness of the gas-tight layer.
- an extender oil or plasticizing oil
- polybutene oils preferably polyisobutylene oils, which have demonstrated the best compromise of properties compared with the other oils tested, in particular with conventional oils of the paraffinic type, are used.
- these oils which are more or less viscous, are liquids (that is, as a reminder, substances having the capacity to eventually take on the shape of their containing), in opposition in particular to resins or rubbers which are inherently solid.
- polyisobutylene oils are sold in particular by the company UNIVAR under the name "Dynapak PoIy” (eg “Dynapak PoIy 190"), by BASF under the names “Glissopal” (eg “Glissopal 1000”) or "Oppanol "(eg” Oppanol B 12 ").
- the number-average molecular weight (Mn) of the polybutene oil is preferably between 200 and 25,000 g / mol, more preferably between 300 and 10,000 g / mol.
- Mn number-average molecular weight
- the number average molecular weight (Mn) of the polybutene 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 a 0.45 ⁇ m 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 minutes.
- the injected volume of the solution of the polymer sample is 100 ⁇ l.
- 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 polybutene oil content be greater than 5 phr, preferably between 5 and 100 phr (parts by weight per hundred parts of total elastomer, that is to say block elastomer such as SIBS plus any other optional elastomer present in the elastomeric layer).
- the elastomeric layer or composition may have too much stiffness for certain applications while beyond the maximum recommended, - -
- the polybutene oil content be greater than 10 phr, in particular between 10 and 90 phr, more preferably still greater than 10 phr. 20 phr, in particular between 20 and 80 phr.
- the airtight layer or composition described above may also include the various additives usually present in the airtight layers known to those skilled in the art.
- examples include reinforcing fillers such as carbon black or silica, non-reinforcing or inert fillers, coloring agents that can be advantageously used for coloring the composition, and lamellar fillers that further improve the sealing (eg phyllosilicates such as kaolin, talc, mica, graphite, clays or modified clays ( "organo clays ⁇ r), plasticizers other than the above-mentioned extender oils, protective agents such as antioxidants or antiozonants, anti-UV, various implementation agents or other stabilizers, or promoters capable of promoting adhesion to the rest of the structure of the pneumatic object.
- reinforcing fillers such as carbon black or silica
- coloring agents that can be advantageously used for coloring the composition
- lamellar fillers that further improve the sealing
- plasticizers other than the above-mentioned extend
- the gas-tight composition could also comprise, still in a minor weight fraction relative to the block elastomer, polymers other than elastomers, such as by example of thermoplastic polymers compatible with the block elastomer.
- the gas-tight layer or composition previously described is a solid (at 23 ° C.) and elastic compound, which is particularly characterized, thanks to its specific formulation, by a very high flexibility and very high deformability.
- this gas-tight layer or composition has a secant modulus in extension, at 10% elongation (denoted MlO), which is less than 2 MPa, more preferably less than 1.5. MPa (especially less than 1 MPa). This quantity is measured at first elongation (ie without accommodation cycle) at a temperature of 23 ° C, with a pulling speed of 500 mm / min (ASTM D412), and reported in section initial test.
- the block elastomer composition described above can be used as an airtight layer in any type of pneumatic object.
- pneumatic objects include pneumatic boats, balls or balls used for play or sport.
- Such an airtight layer is preferentially disposed on the inner wall of the pneumatic object, but it can also be completely integrated into its internal structure.
- the thickness of the airtight layer is preferably greater than 0.05 mm, more preferably between 0.1 mm and 10 mm (especially between 0.1 and 1.0 mm).
- the preferred thickness may be between 1 and 3 mm.
- the preferred thickness may be between 2 and 10 mm.
- the airtight composition described above has the advantage of having a significantly lower hysteresis, and thus of providing reduced rolling resistance to pneumatic tires, as demonstrated in the following embodiments.
- the gas-tight elastomeric layer previously described is advantageously usable in pneumatic tires of all types of vehicles, in particular passenger vehicles or industrial vehicles such as heavy vehicles.
- the single appended figure shows very schematically (without respecting a specific scale), a radial section of a tire according to the invention.
- This tire 1 has a crown 2 reinforced by a crown reinforcement or belt 6, two sidewalls 3 and two beads 4, each of these beads 4 being reinforced with a rod 5.
- the crown 2 is surmounted by a tread represented in this schematic figure.
- a carcass reinforcement 7 is wound around the two rods 5 in each bead 4, the upturn 8 of this armature 7 being for example disposed towards the outside of the tire 1 which is shown here mounted on its rim 9.
- the carcass reinforcement 7 is in known manner constituted of at least one sheet reinforced by so-called "radial” cables, for example textile or metal, that is to say that these cables are arranged substantially parallel to each other and s' extend from one bead to the other so as to form an angle of between 80 ° and 90 ° with the median circumferential plane (plane perpendicular to the axis of rotation of the tire which is located halfway between the two beads 4 and goes through the middle of the crown frame 6).
- radial cables for example textile or metal
- the inner wall of the tire 1 comprises an airtight layer 10, for example of a thickness equal to about 0.9 mm, on the side of the internal cavity 11 of the tire 1.
- This inner layer covers the entire inner wall of the tire, extending from one side to the other, at least to the level of the rim hook when the tire is in the mounted position. It defines the radially inner face of said tire intended to protect the carcass reinforcement from the diffusion of air coming from the space 11 inside the tire. It allows inflation and pressure maintenance of the tire; its sealing properties must enable it to guarantee a relatively low rate of pressure loss, to maintain the swollen bandage, in normal operating condition, for a sufficient duration, normally of several weeks or several months.
- the tire according to the invention uses in this example, as an airtight layer, an SIBS block elastomer ("Sibstar 102T" with a styrene of about 15%, a Tg of about -65 ° C and an Mn of about 90,000 g / mol) extended with about 55 phr of PIB oil ("Dynapak PoIy 190" - Mn of the order of 1000 g / mol).
- SIBS block elastomer (Sibstar 102T" with a styrene of about 15%, a Tg of about -65 ° C and an Mn of about 90,000 g / mol) extended with about 55 phr of PIB oil (“Dynapak PoIy 190" - Mn of the order of 1000 g / mol).
- the tire provided with its airtight layer (10) as described above can be made before or after vulcanization (or cooking). - -
- the airtight layer is simply conventionally applied to the desired location, for formation of the layer 10.
- Vulcanization is then performed conventionally.
- SIBS elastomers support the constraints of the vulcanization step.
- An advantageous manufacturing variant for those skilled in the tire industry, will for example consist in a first step of laying the airtight layer directly on a manufacturing drum in the form of a flat tire. a layer (“skim”) of suitable thickness, before covering the latter with the rest of the structure of the tire, according to manufacturing techniques well known to those skilled in the art.
- the sealing layer is applied inside the baked tire by any appropriate means, for example by gluing, spraying or else extruding and blowing a film of appropriate thickness.
- a rigid wall permeameter was used, placed in an oven (temperature of 60 ° C in this case), provided with a pressure sensor (calibrated in the range of 0 to 6 bars) and connected to a tube equipped with an inflation valve.
- the permeameter can receive standard specimens in the form of a disc (for example 65 mm diameter in this case) and with a uniform thickness of up to 3 mm (0.5 mm in the present case).
- the pressure sensor is connected to a National Instruments data acquisition card (four-channel analog 0-10V acquisition) which is connected to a computer performing a continuous acquisition with a frequency of 0.5 Hz (1 point every two seconds).
- the coefficient of permeability (K) is measured from the linear regression line (average over 1000 points) giving the slope ⁇ of the pressure loss, through the tested test piece, as a function of time, after stabilization of the system, that is to say obtaining a steady state during which the pressure decreases linearly with time.
- the addition of a polybutene oil to the SIBS elastomer allows the implementation and the easy integration of the elastomeric composition or layer into the pneumatic object, in particular by virtue of a lowering the modulus and increasing the tackifying power of said composition.
- pneumatic tires according to the invention of the type for passenger vehicle (size 195/65 Rl 5), were manufactured; their inner wall was covered by an airtight layer (10) with a thickness of 0.9 mm (on the building drum, before manufacturing the rest of the tire), and then the vulcanized tires.
- Said airtight layer (10) was formed of SIBS extended with 55 phr of PIB oil, as described above.
- pneumatic tires according to the invention were compared to control tires (Michelin "Energy 3" brand) comprising a conventional air-tight layer of the same thickness, based on butyl rubber.
- the rolling resistance of pneumatic tires was measured on a steering wheel according to ISO 87-67 (1992).
- the invention offers the designers of pneumatic tires the opportunity to reduce the hysteresis of the internal sealing layers in a very sensitive manner, and therefore the fuel consumption of motor vehicles equipped with such tires, without penalizing the properties sealing.
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Tires In General (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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KR1020097027167A KR101536784B1 (ko) | 2007-05-29 | 2008-05-20 | 열가소성 엘라스토머와 폴리부텐 오일을 함유하는 기밀 층이 제공된 공기주입 물품 |
EA200971110A EA015895B1 (ru) | 2007-05-29 | 2008-05-20 | Пневматическое изделие, снабженное газонепроницаемым слоем, содержащим термопластичный эластомер и полибутеновое масло |
BRPI0812059-5A2A BRPI0812059A2 (pt) | 2007-05-29 | 2008-05-20 | Objeto pneumático provido de uma camada elastomérica estanque aos gases de inflação |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR0703841 | 2007-05-29 | ||
FR0703841A FR2916680B1 (fr) | 2007-05-29 | 2007-05-29 | Objet pneumatique pourvu d'une couche etanche aux gaz a base d'un elastomere thermoplastique et d'une huile polybutene |
Publications (1)
Publication Number | Publication Date |
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WO2008145277A1 true WO2008145277A1 (fr) | 2008-12-04 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/EP2008/004025 WO2008145277A1 (fr) | 2007-05-29 | 2008-05-20 | Objet pneumatique pourvu d'une couche etanche aux gaz a base d'un elastomere thermoplastique et d'une huile polybutene |
Country Status (5)
Country | Link |
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KR (1) | KR101536784B1 (fr) |
BR (1) | BRPI0812059A2 (fr) |
EA (1) | EA015895B1 (fr) |
FR (1) | FR2916680B1 (fr) |
WO (1) | WO2008145277A1 (fr) |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010136389A1 (fr) | 2009-05-25 | 2010-12-02 | Societe De Technologie Michelin | Renfort composite auto-adherent, particulierement pour les pneumatiques, et procede de fabrication associe |
WO2011051204A1 (fr) | 2009-10-29 | 2011-05-05 | Societe De Technologie Michelin | Renfort composite auto-adherent |
FR2954334A1 (fr) * | 2009-12-23 | 2011-06-24 | Michelin Soc Tech | Objet pneumatique pourvu d'une couche etanche aux gaz a base d'un melange d'un elastomere thermoplastique et d'un caoutchouc butyl |
FR2954336A1 (fr) * | 2009-12-23 | 2011-06-24 | Michelin Soc Tech | Objet pneumatique pourvu d'une couche etanche aux gaz a base d'un elastomere thermoplastique styrenique et d'un polyphenylene ether |
FR2954335A1 (fr) * | 2009-12-23 | 2011-06-24 | Michelin Soc Tech | Objet pneumatique pourvu d'une couche etanche aux gaz a base d'un melange d'un elastomere thermoplastique et d'un caoutchouc butyl partiellement reticule |
WO2011092124A1 (fr) | 2010-01-28 | 2011-08-04 | Societe De Technologie Michelin | Composition d'elastomere pour objet pneumatique, a propriete auto-obturante |
WO2011092122A1 (fr) | 2010-01-28 | 2011-08-04 | Societe De Technologie Michelin | Composition d'elastomere pour objet pneumatique, a propriete auto-obturante |
WO2011131560A1 (fr) | 2010-04-21 | 2011-10-27 | Societe De Technologie Michelin | Objet pneumatique pourvu d'une couche étanche aux gaz a base d'un élastomère thermoplastique et d'une résine hydrocarbonée |
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FR2946051B1 (fr) * | 2009-06-02 | 2012-12-28 | Michelin Soc Tech | Composition elastomere a base d'un copolymere thermoplastique,objet pneumatique pourvu d'une couche etanche aux gaz constituee d'une telle composition |
BR112014011050A2 (pt) * | 2011-11-09 | 2017-05-02 | Sumitomo Rubber Ind | pneumático |
KR101358514B1 (ko) * | 2012-09-25 | 2014-02-07 | 엘에스전선 주식회사 | 개선된 수밀 특성을 갖는 직류용 해저케이블 |
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Also Published As
Publication number | Publication date |
---|---|
FR2916680A1 (fr) | 2008-12-05 |
EA015895B1 (ru) | 2011-12-30 |
BRPI0812059A2 (pt) | 2014-11-18 |
EA200971110A1 (ru) | 2010-06-30 |
KR20100028058A (ko) | 2010-03-11 |
KR101536784B1 (ko) | 2015-07-14 |
FR2916680B1 (fr) | 2009-08-21 |
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