WO2006077978A1 - 空気入りラジアルタイヤ - Google Patents
空気入りラジアルタイヤ Download PDFInfo
- Publication number
- WO2006077978A1 WO2006077978A1 PCT/JP2006/300870 JP2006300870W WO2006077978A1 WO 2006077978 A1 WO2006077978 A1 WO 2006077978A1 JP 2006300870 W JP2006300870 W JP 2006300870W WO 2006077978 A1 WO2006077978 A1 WO 2006077978A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- belt
- pneumatic radial
- polyketone
- radial tire
- reinforcing layer
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/44—Yarns or threads characterised by the purpose for which they are designed
- D02G3/48—Tyre cords
-
- 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
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/0042—Reinforcements made of synthetic materials
-
- 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
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T152/00—Resilient tires and wheels
- Y10T152/10—Tires, resilient
- Y10T152/10495—Pneumatic tire or inner tube
- Y10T152/10513—Tire reinforcement material characterized by short length fibers or the like
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T152/00—Resilient tires and wheels
- Y10T152/10—Tires, resilient
- Y10T152/10495—Pneumatic tire or inner tube
- Y10T152/10765—Characterized by belt or breaker structure
- Y10T152/10783—Reinforcing plies made up from wound narrow ribbons
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2913—Rod, strand, filament or fiber
- Y10T428/2933—Coated or with bond, impregnation or core
- Y10T428/2964—Artificial fiber or filament
- Y10T428/2967—Synthetic resin or polymer
Definitions
- the present invention relates to a pneumatic radial tire, particularly a pneumatic radial tire excellent in both handling stability at low speed running and handling stability at high speed running, and handling stability at high speed running and high speed running.
- a pneumatic radial tire excellent in both handling stability at low speed running and handling stability at high speed running, and handling stability at high speed running and high speed running.
- pneumatic radial tires that are superior in both handling stability during operation and that suppress the occurrence of belt edge separation (BES) in which the cord in the belt reinforcement layer and the cord in the belt do not contact each other It is.
- BES belt edge separation
- a belt that is generally used as a reinforcing member for a carcass forming a skeleton of a radial tire for a passenger car, in particular, a reinforcing member for a crown portion of a carcass, is a steel cord mainly inclined with respect to the equator plane of the tire.
- Two or more belt layers with rubberized layer strength are used, and the steel cords in these belt layers are configured to cross each other.
- a belt reinforcing layer formed by rubberizing a reinforcing element such as a nylon cord may be disposed outside the belt in the tire radial direction, and the structure of the belt reinforcing layer may be provided.
- a so-called cap layer structure is known.
- a cord having high rigidity such as aramid fiber cord that does not decrease in elasticity even at high temperatures is applied to the belt reinforcing layer.
- a high-rigidity cord such as aramid fiber cord has an excessively high elastic modulus at room temperature
- a tire equipped with a belt reinforcement layer using the high-rigidity cord as a reinforcing element has a ground contact area during low-speed running. It is insufficient.
- a tire having a belt reinforcing layer using aramid fiber cord as a reinforcing element is excellent in driving stability at high speeds, while at low speeds (that is, the tires are cold and the centrifugal force applied to the tires is small). In this case, the steering stability was inferior.
- a first object of the present invention is to provide a pneumatic radial tire excellent in steering stability at low speed running and steering stability at high speed running.
- a tire cord it is common to use a cord of a double twist structure in which two filament bundles are twisted together. By twisting two filament bundles, the binding force between the filaments is improved. Thus, the fatigue resistance of the cord can be improved.
- the cord having a thick cord diameter is applied to the belt reinforcing layer, the cord of the belt reinforcing layer and the cord of the belt layer (generally a steel cord) are in contact with each other. There is a problem that peeling at the end of the belt, so-called belt edge separation (BES), is likely to occur.
- BES belt edge separation
- a twin-twisted structure cord a long time is required for the twisting process, which increases processing costs and causes a problem in terms of manufacturing cost.
- the second object of the present invention is excellent in steering stability at low speed running and steering stability at high speed running, and the cord in the belt reinforcement layer and the cord in the belt are in contact with each other.
- the object is to provide a pneumatic radial tire in which generation of belt edge separation (BES) is suppressed without force S.
- the present inventor has found that in a pneumatic radial tire including a belt reinforcing layer on the radially outer side of the belt, the reinforcing element of the belt reinforcing layer By using a polyketone fiber cord having a specific heat shrinkage stress and elastic modulus, it is possible to secure a sufficient contact area of the tire during low-speed driving and improve steering stability during low-speed driving, as well as during high-speed driving. It has been found that since the belt reinforcing layer exerts a high-speed tagging effect due to heat shrinkage stress, the handling stability at high speeds is also improved.
- the belt reinforcing layer By using a polyketon fiber cord with a single twist structure having a specific heat shrinkage stress and elastic modulus as a reinforcing element, sufficient contact area of the tire during low-speed driving is ensured, and steering stability during low-speed driving.
- the belt reinforcement layer exerts a high hiding effect during high-speed running, so that the handling stability during high-speed running is also improved and the interlayer gauge between the belt and the belt reinforcement layer is sufficiently secured.
- BES belt edge separation
- the pneumatic radial tire of the present invention has a pair of bead portions and a pair of side wheel portions, and a tread portion connected to both sidewall portions, and a toroidal shape between the pair of bead portions.
- a carcass that extends to the outside of the carcass, and at least two belt layers arranged on the outer side in the tire radial direction of the crown of the carcass, and the entire belt and the Z or both ends on the outer side of the belt in the tire radial direction.
- a pneumatic radial tire provided with at least one belt reinforcing layer composed of a rubberized layer of reinforcing elements arranged so as to cover the portion and arranged substantially parallel to the tire circumferential direction,
- Reinforcing elements constituting the belt reinforcing layer have the following formulas (I) and (II):
- ⁇ is the heat shrinkage stress (cN / dtex) at 177 ° C; ⁇ is the elastic modulus at 49N load (cN / dtex) at 25 ° C] It is characterized by being.
- the heat shrinkage stress ⁇ of the polyketone fiber cord at 177 ° C is a 5 ° C / 25cm long fixed sample of the polyketone fiber cord before vulcanization subjected to a general dipping treatment. This is the stress generated in the cord at 177 ° C when heated at a heating rate of 5 minutes, and the elastic modulus E of the above-mentioned polyketone fiber cord at 49N load at 25 ° C is SS by JIS cord tensile test. It is the elastic modulus in the unit cN / dtex where the tangential force at 49N of the curve is also calculated.
- the number of driving of the polyketone fiber cord in the belt reinforcing layer is 40 to 70 (pieces / 50 mm).
- the belt reinforcing layer is formed of a ribbon-like sheet obtained by rubberizing one or more reinforcing elements having a width that is narrower than the width of the belt reinforcing layer. It is preferably formed by spiral winding a plurality of times in the width direction of the tire until it reaches the width dimension.
- the polyketone fiber cord used for the belt reinforcing layer is preferably formed by twisting two filament bundles having polyketone strength.
- the twist coefficient ⁇ defined by [where T is the number of twists (times / 100 mm) and D is the total fineness (dtex) of the cord] is preferably 850 to 4000.
- the polyketone fiber cord used for the belt reinforcing layer is more preferably formed by twisting two filament bundles made of polyketone having a fineness of 500 to 3000 dtex.
- the polyketone fiber cord used for the belt reinforcing layer is preferably a twisted filament bundle having a polyketone force.
- the second object can be achieved. More specifically, while improving the steering stability during low-speed driving of the tire and the steering stability during high-speed driving, the cords in the belt reinforcing layer By preventing the cords in the belt from coming into contact with each other, the occurrence of belt edge separation (BES) can be suppressed.
- the following formula (III) of the polyketone fiber cord used for the belt reinforcing layer is the following formula (III) of the polyketone fiber cord used for the belt reinforcing layer:
- the twist coefficient ⁇ defined by [where T is the number of twists (times / 100 mm) and D is the total fineness (dtex) of the cord] is 300 to 1300.
- the polyketone fiber cord used for the belt reinforcing layer is a twisted filament bundle having a fineness of 500 to 3000 dtex and having a polyketone strength.
- the polyketone force is represented by the following general formula (IV):
- A is a portion derived from an unsaturated compound polymerized by an unsaturated bond, and each repeating unit may be the same or different! /, And the repeating unit force represented by It becomes.
- a in the formula (IV) is an ethylene group.
- the polyketone fiber cord has a reversibility that shrinks at a high temperature and expands when returned to room temperature.
- steering stability at low speed traveling and longitudinal stability at high speed traveling are provided, including a belt reinforcing layer having a polyketone fiber cord having specific heat shrinkage stress and elastic modulus as a reinforcing element.
- a pneumatic radial tire excellent in performance can be provided.
- steering stability and high speed during low-speed traveling including a belt reinforcing layer that uses a polyketone fiber cord having a single twist structure having a specific heat shrinkage stress and elastic modulus as a reinforcing element.
- a pneumatic radial tire that is excellent in handling stability during driving and that suppresses the generation of belt edge separation (BES) in which the cord in the belt reinforcement layer and the cord in the belt do not contact each other. Can be provided.
- FIG. 1 is a cross-sectional view of one embodiment of a pneumatic radial tire of the present invention.
- FIG. 2 is a cross-sectional view of another embodiment of the pneumatic radial tire of the present invention.
- FIG. 3 is a cross-sectional view of another embodiment of the pneumatic radial tire of the present invention.
- FIG. 1 is a cross-sectional view of one embodiment of the pneumatic radial tire of the present invention
- FIGS. 2 and 3 are cross-sectional views of other embodiments of the pneumatic radial tire of the present invention.
- the radial tire shown in FIG. 1 has a pair of bead portions 1 and a pair of sidewall portions 2, and a tread portion 3 connected to both the sidewall portions 2, and a toroidal shape between the pair of bead portions 1.
- a radial carcass 4 extending to the respective parts 1, 2, and 3 and the carcass 4
- a belt 5 consisting of at least two belt layers arranged on the outer side of the tire in the radial direction of the tire, and a belt reinforcing layer 6A arranged so as to cover the entire belt 5 on the outer side of the belt 5 in the radial direction of the tire
- a pair of belt reinforcement layers 6B arranged so as to cover both ends of the belt 5 outside the belt reinforcement layer 6A in the tire radial direction.
- the radial carcass 4 in the illustrated example has a single carcass ply force, a main body portion extending in a toroid shape between a pair of bead cores 7 embedded in the bead portion 1, and The inner force in the tire width direction around the bead core 7
- the force consisting of the folded portion that is raised outward in the radial direction toward the outside In the pneumatic radial tire of the present invention, the number of plies and the structure of the radial carcass 4 are It is not limited to.
- a belt 5 consisting of two belt layers is disposed on the outer side in the tire radial direction of the crown portion of the radial carcass 4, and the belt layer includes: Usually, it is composed of a rubberized layer of cords extending incline with respect to the tire equatorial plane, preferably a rubberized layer of steel cords, and two belt layer forces.
- the belt 5 is formed by being stacked so as to cross each other.
- the belt 5 in the figure is a force composed of two belt layers.
- the number of belt layers constituting the belt 5 may be three or more.
- the belt reinforcing layers 6A and 6B are composed of rubberized layers of reinforcing elements arranged substantially parallel to the tire circumferential direction, and the reinforcing elements are polyketone fiber cords described later. It is necessary to consist of.
- the belt reinforcing layer 6 A that covers the entire belt 5 and the belt reinforcing layer 6B that covers both ends of the belt 5 are arranged one by one on the outer side in the tire radial direction of the belt 5.
- the number of layers of the belt reinforcing layer 6A and the belt reinforcing layer 6B may be two or more.
- the radial tire of the present invention is not particularly limited as long as one or more belt reinforcing layers are provided on the outer side in the tire radial direction of the belt 5.
- the radial tire of the present invention is not particularly limited as long as one or more belt reinforcing layers are provided on the outer side in the tire radial direction of the belt 5.
- the belt reinforcing layer 6A is a single layer
- the belt reinforcing layer 6B is a double layer.
- the number of the belt reinforcing layers 6A, 6B is not limited to this.
- the reinforcing elements constituting the belt reinforcing layers 6A and 6B are represented by the following formulas (I) and (II):
- the twist structure of the polyketone fiber cord is not particularly limited.
- the polyketone fiber cord include a polyketon fiber cord obtained by twisting two filament bundles having polyketone strength, and a filament bundle having polyketone strength. Polyketone fiber cords twisted can be used!
- the polyketone fiber cord has a large thermal shrinkage stress at high temperatures, even when the polyketone fiber cord is disposed in the tire so as to ensure a sufficient ground contact area during low speed running, As the temperature of the tire rises, sufficient heat shrinkage stress is generated in the cord, and the belt reinforcing layers 6A and 6B exert a sufficient tagging effect to suppress treading due to centrifugal force. Therefore, by using the polyketone fiber cord satisfying the above formulas (I) and (II), it is possible to achieve both the steering stability at low speed running and the steering stability at high speed running. When using a general fiber cord, the steering stability at low speed and the steering stability at high speed are in a trade-off relationship, so they cannot be made compatible. This is possible only when a polyketone fiber cord satisfying (II) is used.
- the above formula (I) is derived as follows from the viewpoint of tire performance.
- the force that suppresses the change in the shape of the tire in high-speed driving conditions is the anti-F1 that the belt reinforcement layer passively develops against external inputs (for example, centrifugal force and strain), and the belt reinforcement by heat generation.
- anti-F2 in which the layer is actively expressed. That is, tires at high speeds.
- the sum of F1 and F2 must be above a certain level, and the contribution ratios of F1 and F2 are
- the main governing factor of F1 is the stiffness EC of the cord in the belt reinforcing layer
- the main governing factor of F2 is the heat shrinkage stress HF of the cord in the belt reinforcing layer.
- the cord to be used does not satisfy the relationship of the above formula (I)
- a cord having a large thermal shrinkage stress ⁇ but a low elastic modulus ⁇ is used, the belt reinforcing layer has a tagging effect during high-speed running.
- a cord with a high elastic modulus ⁇ but a small thermal contraction stress ⁇ is used, a sufficient contact area of the tire during low-speed driving cannot be secured. Stability and handling stability at high speed cannot be improved at the same time.
- the cord to be used does not satisfy the relationship of the above formula (II), the heat shrinkage stress ⁇ at high temperature, that is, high speed running is too small, so that the ground contact area at low speed can be secured.
- the cord is installed in the belt, the belt reinforcement layer 6 ⁇ and 6 ⁇ at the time of high-speed running is insufficient and the tread comes out and the ground contact shape changes greatly, so the steering stability during high-speed running of the tire decreases.
- the cords are arranged so that the belt reinforcement layers 6 and 6 can sufficiently exhibit the tagging effect during high-speed driving, sufficient contact area of the tire during low-speed driving is ensured. As a result, the handling stability of the tire when traveling at low speed is reduced.
- the polyketone fiber cord preferably has a heat shrinkage stress ⁇ at 177 ° C of 1.5 cN / dtex or less. If the heat shrinkage stress of polyketone fiber cord at 177 ° C exceeds the ⁇ force Sl.5c N / dtex, the shrinkage force during vulcanization will be too large, resulting in cord irregularities inside the tire and rubber misalignment. Cause endurance and endurance.
- the polyketone fiber cord prevents the contact of the cord in the belt with the polyketone fiber cord in the belt reinforcing layer during vulcanization of the raw tire, and suppresses a decrease in the durability of the tire.
- Thermal contraction stress at ° C ⁇ force It is more preferable that it is not more than 30 cN / dtex. It is still more preferable that it is not more than 0.90 cN / dtex.
- the above-mentioned polyketone fiber cord preferably has a heat shrinkage stress at 177 ° C of ⁇ force of .05 cN / dtex or more from 0.15 cN / dtex or more from the viewpoint of sufficiently suppressing the tread protrusion at high speed. It is even more preferable that it is more than 0.4 cN / dtex.
- the above polyketone fiber cord preferably has an elastic modulus E of 3 ⁇ 40 cN / dtex or more at a load of 49 N at 25 ° C from the viewpoint of sufficiently suppressing the protrusion of the tread at a high speed. It is even more preferable that it is more than / d tex.
- the belt reinforcing layers The polyketone fiber cord used for 6A and 6B is preferably a twisted filament bundle having polyketone strength.
- the polyketone fiber cord is a cord in which one filament bundle having polyketone strength is twisted, it is possible to prevent the cord diameter from becoming thick. Therefore, by using a polyketone fiber cord obtained by twisting one filament bundle that also has polyketone strength as a reinforcement element for the belt reinforcement layers 6A and 6B, a sufficient interlayer gauge between the belt 5 and the belt reinforcement layers 6A and 6B can be secured.
- the cords in the belt 5 and the cords in the belt reinforcing layers 6A and 6B can be prevented from coming into contact with each other, and as a result, the occurrence of belt edge separation (BES) can be suppressed.
- BES belt edge separation
- a high-strength cord is used for the belt reinforcing layers 6A and 6B, it is difficult to secure an interlayer gauge between the belt 5 and the belt reinforcing layers 6A and 6B, but a highly elastic polyketone filament bundle 1 The use of a twisted cord makes it possible to secure the interlayer gauge.
- the number of driven-in polyketone fiber cords is in the range of 40 to 70 (pieces / 50 mm)! /. If the number of polyketone fiber cords driven into the belt reinforcement layer is less than 40 (lines / 50mm), the belt reinforcement capacity of the belt reinforcement layer will be small. On the other hand, if the number of polyketone fiber cords driven in the belt reinforcement layer exceeds 70 (pieces / 50mm), the weight of the tire will increase if the polyketone fiber cords are made by twisting two filament bundles made of polyketone.
- the treat rigidity at normal temperature becomes excessive, the ground contact area force at low speed is reduced, and the polyketone fiber cord is a twisted filament bundle with polyketone force.
- the treat stiffness becomes excessive, and the belt and the belt reinforcing layer are easily brought into contact with each other due to expansion and thermal shrinkage stress during tire vulcanization, causing BES to bow.
- the polyketone fiber cord used for the belt reinforcing layers 6A and 6B is formed by twisting two filament bundles having polyketone strength
- the polyketone fiber cord has the following formula (III):
- the twist coefficient ⁇ defined by [where T is the number of twists (times / 100 mm) and D is the total fineness (dtex) of the cord] is in the range of 850 to 4000.
- T is the number of twists (times / 100 mm) and D is the total fineness (dtex) of the cord
- the polyketone fiber cord used for the belt reinforcing layers 6A and 6 ⁇ has a polyketone strength.
- the polyketone fiber cord has a filament with a polyketone strength of 500 to 3 OOOdtex. More preferably, two bundles are twisted together.
- the fineness of the filament bundle used for the polyketone fiber cord is less than 500 dtex, both the elastic modulus and the heat shrinkage stress are insufficient, and when it exceeds 3000 dtex, the cord diameter becomes thick and the driving cannot be made dense.
- the polyketone fiber cord used in the belt reinforcing layers 6A and 6B is a twisted filament bundle having a polyketone strength
- T is the number of twists (times / 100 mm) and D is the total fineness (dtex) of the cord.
- Polyketone fiber cord twister When the number ⁇ is less than 300, the heat shrinkage stress is not sufficiently exhibited, and when it exceeds 1300, the elastic modulus is not sufficiently exhibited (the belt reinforcing ability is small).
- the polyketone fiber cord used for the belt reinforcing layers 6A and 6 ⁇ has a polyketone strength
- the polyketone fiber cord has a polyketone strength with a fineness of 500 to 3 OOOdtex. More preferably, one filament bundle is twisted. If the fineness of the filament bundle used in the polyketon fiber cord is less than 500 dtex, the elastic modulus is not sufficiently exerted (the belt reinforcing ability is small), and if it exceeds 3000 dtex, the elastic modulus' heat shrinkage stress per cord is excessive. This causes contact between the cord of the belt reinforcement layer and the cord of the belt layer.
- the polyketone fiber cord used for the belt reinforcing layers 6A and 6B preferably has a reversibility that shrinks at a high temperature and expands at room temperature.
- the polyketone fiber cord in the belt reinforcement layer contracts at high temperatures, that is, at high speeds, and a sufficient tagging effect can be exerted to sufficiently suppress the tread from protruding. That is, the polyketone fiber cord in the belt reinforcing layer is stretched during low-speed running, and the tire contact area can be sufficiently secured.
- a reversible polyketone fiber cord with a difference in thermal shrinkage stress between 20 ° C and 177 ° C of 0.20 cN / dtex or more, preferably 0.25 cN / dtex or more, it can be used for normal driving and high-speed driving. Both effects can be achieved at the same time.
- the reinforcing element constituting the belt reinforcing layer of the pneumatic radial tire of the present invention needs to be a polyketone fiber cord satisfying the conditions of the above formulas (I) and (II).
- a polyketone substantially consisting of repeating units represented by the above formula (IV) is preferable.
- the said polyketone, or 97 mole% of the repeating units are 1-O Kiso trimethylene [- CH -CH-CO-] in which polyketone is preferable instrument 99 mole 0/0 or more
- polyketones with 1-oxotrimethylene on the top More preferred are polyketones with 100 mol% 1-oxotrimethylene.
- the polyketone used as the raw material of the polyketone fiber cord may have a partially bonded ketone group and a portion derived from an unsaturated compound, but a portion derived from an unsaturated compound and a ketone group are alternately arranged.
- the proportion of the arranged parts is preferably 90% by mass or more, more preferably 97% by mass or more, and most preferably 100% by mass.
- ethylene is most preferable as the unsaturated compound forming A, but propylene, butene, pentene, cyclopentene, hexene, cyclohexene, heptene, Unsaturated hydrocarbons other than ethylene such as otaten, nonene, decene, dodecene, styrene, acetylene, allene, methyl acrylate, methyl methacrylate, vinyl acetate, acrylamide, hydroxyethyl methacrylate, undecenoic acid, undeceno And compounds containing unsaturated bonds such as hexene, 6-chlorohexene, N-bull pyrrolidone, sulfur phosphonic acid jetyl ester, sodium styrene sulfonate, sodium aryl sulfonate, bull pyrrolidone, and chlorinated bull. Also good.
- the polymerization degree of the polyketone is represented by the following formula: c ⁇ 0 (t. C)
- t and T are the flow time of a viscosity tube at 25 ° C. of a diluted solution of hexafluoroisopropanol with a purity of 98% or more and a polyketone dissolved in the hexafluoroisopropanol;
- C the intrinsic viscosity [7?] Defined by the mass of the solute in the diluted solution lOOmL (g)] is preferably in the range of l to 20dL / g, in the range of 2 to 10dL / g. It is even more preferable that it is in the range of 3 to 8, which is even more preferable.
- the intrinsic viscosity is less than IdL / g, the molecular weight is too small, and it becomes difficult to obtain a high-strength polyketone fiber cord, and troubles such as fluff and yarn breakage occur frequently during spinning, drying and drawing.
- the intrinsic viscosity exceeds 20 dL / g, it takes time and cost to synthesize the polymer, and it becomes difficult to uniformly dissolve the polymer, which may adversely affect the spinnability and physical properties.
- the polyketone fiberization method includes (1) a method in which undrawn yarn is spun and then subjected to multi-stage hot drawing and drawn at a specific temperature and magnification in the final drawing step of the multi-stage hot drawing. (2) A method in which after unspun yarn is spun, heat-stretched, and then rapidly cooled while high tension is applied to the fiber after the heat-stretching is preferred. A desired filament suitable for the production of the polyketone fiber cord can be obtained by fiberizing the polyketone by the method (1) or (2).
- the spinning method for the undrawn yarn of the polyketone is not particularly limited and is conventionally known. Specifically, hexafluoroisopropanol and m-taresol as described in JP-A-2-112413, JP-A-4-228613 and JP-A-4505344 are used. Zinc salts as described in wet spinning using an organic solvent such as WO99Z18143, WOOOZ09611, JP2001-164422, JP2004-218189, and JP2004285185 , Wet spinning using an aqueous solution of calcium salt, thiocyanate, iron salt and the like. Among these, a wet spinning method using an aqueous solution of the above salt is preferable.
- a polyketone polymer is dissolved in hexafluorosolpropanol, m-taresol, or the like at a concentration of 0.25 to 20% by mass, extruded from a spinning nozzle to be fiberized, and then toluene, ethanol Unstretched yarn of polyketone can be obtained by removing the solvent in a non-solvent bath such as, isopropanol, n- hexane, isooctane, acetone, methyl ethyl ketone, and washing.
- a non-solvent bath such as, isopropanol, n- hexane, isooctane, acetone, methyl ethyl ketone, and washing.
- a polyketone polymer is dissolved at a concentration of 2 to 30% by mass in an aqueous solution of zinc salt, calcium salt, thiocyanate, iron salt, etc.
- Spinning nozzle force at 130 ° C Extruded into a coagulation bath to perform gel spinning, and further desalted and dried to obtain an undrawn polyketone yarn.
- aqueous solution in which the polyketone polymer is dissolved it is preferable to use a mixture of halogenated zinc and a halogenated alkali metal salt or a halogenated alkaline earth metal salt.
- An organic solvent such as acetone or methanol can be used.
- a hot drawing method in which the undrawn yarn is heated to a temperature higher than the glass transition temperature of the undrawn yarn and stretched is more preferable.
- the drawing of the yarn may be performed in one step in the method (2), but is preferably performed in multiple steps.
- a method of running a yarn on a heating roll or a heating plate can be employed as the method of heat stretching.
- the total stretching ratio in which the heat stretching temperature is preferably in the range of 110 ° C to (the melting point of the polyketone) is preferably 10 times or more.
- the temperature in the final drawing step of the multistage hot drawing is 110 ° C to (the drawing temperature of the drawing step 3 ° before the final drawing step is 3 ° C
- the draw ratio in the final drawing step of the multistage hot drawing is preferably in the range of 1.01 to 1.5 times.
- the tension applied to the fiber after completion of hot drawing is preferably in the range of 0.5 to 4 cN / dtex, and the cooling rate in rapid cooling is 30 °. It is preferable that the temperature is C / second or more.
- the cooling end temperature in the rapid cooling is preferably 50 ° C or less.
- the rapid cooling method of the heat-stretched polyketone fiber a conventionally known method without particular limitation can be adopted, and specifically, a cooling method using a roll is preferable. Since the polyketone fiber thus obtained has a large residual elastic strain, it is usually preferable to perform relaxation heat treatment so that the fiber length is shorter than the fiber length after hot drawing.
- the temperature of the relaxation heat treatment is preferably in the range of 50 to 100 ° C, and the relaxation ratio is preferably in the range of 0.980 to 0.999 times.
- the method for producing the polyketone fiber cord is not particularly limited.
- the polyketone fiber cord is formed by twisting two filament bundles having polyketone strength, that is, in a double twist structure, for example, the filament bundle also having polyketone force is subjected to under twisting, and then the two are combined. By twisting in the opposite direction, it can be obtained as a twisted cord.
- the polyketone fiber cord is formed by twisting one filament bundle having a polyketone force, that is, having a single-stranded structure, for example, the filament bundle having the polyketone force is gathered and twisted in one direction. Can be obtained as a twisted yarn cord.
- a cord / rubber composite used for the belt reinforcing layers 6A and 6B can be obtained.
- the coating rubber of the polyketone fiber cord there is no particular limitation, and the coating rubber used for the conventional belt reinforcing layer can be used.
- the polyketone fiber cord Prior to rubberizing the polyketone fiber cord, the polyketone fiber cord may be subjected to an adhesive treatment to improve the adhesion to the coating rubber.
- the pneumatic radial tire of the present invention can be manufactured by applying a cord z rubber composite formed by rubberizing the above-mentioned polyketone fiber cord to the belt reinforcing layers 6A and 6B and using a conventional method.
- a cord z rubber composite formed by rubberizing the above-mentioned polyketone fiber cord to the belt reinforcing layers 6A and 6B and using a conventional method.
- the gas filled in the tire normal or air having a changed oxygen partial pressure, or an inert gas such as nitrogen can be used.
- a ribbon-like sheet obtained by rubberizing one or more reinforcing elements having a width smaller than the width of the belt reinforcing layers 6A and 6B is provided.
- the belt reinforcing layers 6A and 6B are preferably formed by spiral winding a plurality of times in the width direction of the tire until the width is reached.
- the joint 5 does not occur in the tire circumferential direction, and the belt 5 can be reinforced uniformly.
- a radial tire of size 235Z55R17 having the structure shown in Fig. 2 was produced according to a conventional method.
- Each test tire is the same except for the cord used for the belt reinforcement layer, the belt of the test tire is composed of two steel belt layers, and the belt layer on the inner side in the tire radial direction has a width of 200 mm. Yes, the belt layer on the outer side in the tire radial direction has a width of 190mm.
- a belt reinforcement layer 6A adjacent to the belt and covering the entire belt was arranged so that the belt end force also emerged 10 mm outward in the tire width direction.
- the belt reinforcing layer of the test tire is made of a ribbon-like sheet obtained by rubberizing a cord made of the material shown in Table 1, and is substantially parallel to the circumferential direction on the outer side in the tire radial direction of the belt. Thus, it was manufactured in a spiral shape.
- the cord used was prepared by twisting a raw yarn of a predetermined fineness, combining the two, and further twisting. The tires manufactured in this way were measured for the contact area, steering stability during low-speed driving, steering stability during high-speed driving, and tread protrusion by the following methods. The results are shown in Table 1.
- a test tire adjusted to an internal pressure of 1.7 kg / cm 2 (1.67 X 10 5 Pa) was placed on a drum with an outer diameter of 3000 mm, and the load determined by J ATMA or IS from this tire size and internal pressure. Loaded After that, pre-run for 30 minutes at the specified speed, readjust the internal pressure to 1.7 kg / cm 2 in the no-load condition, and then apply the slip angle continuously up to 14 ° with the drum at the specified load and speed. It was. Measure the cornering force (CF) at each positive and negative angle.
- CF cornering force
- Nylon products that is, Comparative Example 1 in Table 1 and Comparative Example 5 in Table 2 were set to 100.
- the amount of protrusion at the end of the tread at 200 km / h at an internal pressure of 1.7 kg / cm 2 and a load specified by JATMA or ⁇ O IS was measured by photography.
- the amount of protrusion at 40 km / h was evaluated as the difference from the amount of protrusion at 200 km / h with reference conditions.
- the tire of the example in which the polyketone fiber cord satisfying the above formulas (I) and (II) is used as the reinforcing element of the belt reinforcing layer has a large ground contact area at room temperature.
- the tread protrusion during high-speed driving is suppressed, so that the steering stability during high-speed driving was also excellent.
- the tire of Comparative Example 1 in which the nylon cord is used as the reinforcing element of the belt reinforcing layer has a poor handling stability at high speeds compared to the examples because the treads protrude at high speeds. It was.
- the tire of Comparative Example 2 in which the aramid cord is used as the reinforcing element of the belt reinforcement layer has a small ground contact area at room temperature, so that the driving stability at low speeds is inferior to that of Comparative Example 1 and the Example tire. It was.
- a radial tire of size 205Z65R15 having the structure shown in FIG. 1 was produced according to a conventional method.
- Each test tire is the same except for the cord used for the belt reinforcement layer, the belt of the test tire is composed of two steel belt layers, and the belt layer on the inner side in the tire radial direction has a width of 160 mm.
- the belt layer on the outer side in the tire radial direction has a width of 150 mm.
- a belt reinforcement layer 6A that is adjacent to the belt and covers the entire belt is arranged so that the belt end force is also 5 mm outward in the tire width direction.
- Belt reinforcing layers 6B covering only both ends were respectively arranged with a width of 25 mm from the end of the belt reinforcing layer 6A to the inside in the tire width direction.
- the belt reinforcing layer of the test tire is made of a ribbon-like sheet obtained by rubberizing a cord made of the material shown in Table 2, and is substantially parallel to the circumferential direction on the outer side in the tire radial direction of the belt. Thus, it was manufactured by winding it in a spiral shape.
- the cord used is produced by twisting a yarn of a predetermined fineness in one direction, while in the case of a double twist structure, the yarn of a predetermined fineness is twisted and twisted. Two pieces were combined and further twisted.
- the ground contact area, steering stability at low speeds, steering stability at high speeds, and tread protrusion amount were measured by the above method. And the belt gauge separation and the belt edge separation durability were measured. The results are shown in Table 2.
- the tire is cut in the width direction, and the cross section of the outer belt in the radial direction
- the shortest distance from each belt cord to the latest cap cord was measured, and the average value of the 5 cords was calculated.
- BES Belt edge separation
- a polyketone consisting of repeating units represented by the formula ([V), where ⁇ is mainly an ethylene group (containing approximately 6% propylene).
- the tires of Examples 5 to 7 in which the polyketone fiber cord having a single twist structure satisfying the above formulas (I) and (II) is used as the reinforcing element of the belt reinforcing layer are as follows.
- the large contact area at normal temperature provides excellent handling stability at low speeds, and the tread protrusion at high speeds is suppressed, providing excellent handling stability at high speeds. Since the gauge between the belt reinforcement layer was sufficiently secured, the belt edge separation durability was very good.
- the tire of Comparative Example 5 in which the nylon cord is used as the reinforcing element of the belt reinforcing layer has poor handling stability at high speeds compared to the examples because the treads protrude at high speeds. It was.
- the tire of Comparative Example 6 in which the aramid cord is used as the reinforcing element of the belt reinforcing layer has a small ground contact area at room temperature, so that the steering stability at low speeds is higher than that of Comparative Example 5 and Examples 5-7.
- the gauge between the belt and the belt reinforcement layer was inadequate, and the belt edge separation durability was poor.
- the tire of Comparative Example 7 that satisfies the above formulas (I) and (II) and uses a polyketone fiber cord having a double twist structure as a reinforcing element of the belt reinforcing layer is provided between the belt and the belt reinforcing layer.
- the gauge was insufficient and the belt edge separation durability was bad.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE602006019052T DE602006019052D1 (de) | 2005-01-21 | 2006-01-20 | Radialluftreifen |
JP2006553975A JP5072368B2 (ja) | 2005-01-21 | 2006-01-20 | 空気入りラジアルタイヤ |
EP06712095A EP1839907B1 (en) | 2005-01-21 | 2006-01-20 | Pneumatic radial tire |
US11/795,517 US7823616B2 (en) | 2005-01-21 | 2006-01-20 | Pneumatic radial tire with belt reinforcing layer cord having specified heat shrinkage stress |
CN200680002760.XA CN101107138B (zh) | 2005-01-21 | 2006-01-20 | 充气子午线轮胎 |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005014336 | 2005-01-21 | ||
JP2005-014155 | 2005-01-21 | ||
JP2005-014336 | 2005-01-21 | ||
JP2005014155 | 2005-01-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006077978A1 true WO2006077978A1 (ja) | 2006-07-27 |
Family
ID=36692358
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/300870 WO2006077978A1 (ja) | 2005-01-21 | 2006-01-20 | 空気入りラジアルタイヤ |
Country Status (6)
Country | Link |
---|---|
US (1) | US7823616B2 (ja) |
EP (1) | EP1839907B1 (ja) |
JP (1) | JP5072368B2 (ja) |
CN (1) | CN101107138B (ja) |
DE (1) | DE602006019052D1 (ja) |
WO (1) | WO2006077978A1 (ja) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007168709A (ja) * | 2005-12-26 | 2007-07-05 | Bridgestone Corp | 空気入りラジアルタイヤ |
WO2007122984A1 (ja) * | 2006-04-17 | 2007-11-01 | Bridgestone Corporation | 空気入りタイヤ |
WO2007135864A1 (ja) * | 2006-05-23 | 2007-11-29 | Bridgestone Corporation | 空気入りタイヤ |
JP2008013035A (ja) * | 2006-07-05 | 2008-01-24 | Bridgestone Corp | 空気入りタイヤ |
WO2008035771A1 (en) * | 2006-09-22 | 2008-03-27 | The Yokohama Rubber Co., Ltd. | Pneumatic radial tire |
WO2008062862A1 (fr) * | 2006-11-24 | 2008-05-29 | Bridgestone Corporation | Bandage pneumatique |
WO2009041692A1 (ja) * | 2007-09-27 | 2009-04-02 | Bridgestone Corporation | 空気入りタイヤ |
JP2009096456A (ja) * | 2007-09-27 | 2009-05-07 | Bridgestone Corp | 空気入りタイヤ |
WO2009091066A1 (ja) * | 2008-01-18 | 2009-07-23 | Bridgestone Corporation | 空気入りラジアルタイヤ |
JP2009190726A (ja) * | 2008-01-18 | 2009-08-27 | Bridgestone Corp | 空気入りラジアルタイヤ |
JP2010143390A (ja) * | 2008-12-18 | 2010-07-01 | Toyo Tire & Rubber Co Ltd | 空気入りラジアルタイヤ |
US7882878B2 (en) * | 2006-01-04 | 2011-02-08 | Bridgestone Corporation | Radial tire for airplane |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100018625A1 (en) * | 2008-07-22 | 2010-01-28 | Serge Julien Auguste Imhoff | Pneumatic tire with polyketone belt structure |
US7669626B1 (en) * | 2008-11-07 | 2010-03-02 | The Goodyear Tire & Rubber Company | Tire with component containing polyketone short fiber and polyethyleneimine |
US20100116403A1 (en) * | 2008-11-07 | 2010-05-13 | Ralf Mruk | Tire with component containing polyketone short fiber and epoxidized polyisoprene |
JP5091938B2 (ja) * | 2009-12-15 | 2012-12-05 | 住友ゴム工業株式会社 | 空気入りタイヤ |
JP5685047B2 (ja) * | 2010-10-15 | 2015-03-18 | 住友ゴム工業株式会社 | 空気入りタイヤ |
JP5276647B2 (ja) * | 2010-11-18 | 2013-08-28 | 住友ゴム工業株式会社 | 空気入りタイヤの製造方法 |
EP2979899B1 (en) * | 2013-03-29 | 2017-11-29 | The Yokohama Rubber Co., Ltd. | Pneumatic tire |
JP6286147B2 (ja) * | 2013-07-29 | 2018-02-28 | 東洋ゴム工業株式会社 | 空気入りタイヤ |
US9376118B2 (en) * | 2014-07-08 | 2016-06-28 | The Goodyear Tire & Rubber Company | Assessment of tire condition based on a tire health parameter |
JP6450112B2 (ja) * | 2014-08-15 | 2019-01-09 | 株式会社ブリヂストン | 空気入りタイヤ |
CN106739831B (zh) * | 2016-12-26 | 2018-08-14 | 正新橡胶(中国)有限公司 | 一种半钢子午线充气轮胎及其成型装置 |
EP3727889B1 (fr) * | 2017-12-22 | 2022-06-22 | Compagnie Generale Des Etablissements Michelin | Pneumatique comprenant une nappe de frettage perfectionnée |
JP7139752B2 (ja) * | 2018-07-24 | 2022-09-21 | 横浜ゴム株式会社 | 空気入りラジアルタイヤ |
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JPH0370602A (ja) * | 1989-08-09 | 1991-03-26 | Sumitomo Rubber Ind Ltd | 空気入りラジアルタイヤ |
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AU763281B2 (en) * | 2000-04-11 | 2003-07-17 | Performance Fibers, Inc. | Composite comprising organic fibers having a low twist multiplier and improved compressive modulus |
JP3595846B2 (ja) * | 2000-04-12 | 2004-12-02 | 旭化成せんい株式会社 | ポリケトン繊維およびその製造方法 |
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JP4173270B2 (ja) * | 2000-05-30 | 2008-10-29 | 住友ゴム工業株式会社 | 空気入りラジアルタイヤ |
JP4315721B2 (ja) | 2003-04-02 | 2009-08-19 | 株式会社ブリヂストン | 航空機用空気入りラジアルタイヤ |
-
2006
- 2006-01-20 WO PCT/JP2006/300870 patent/WO2006077978A1/ja active Application Filing
- 2006-01-20 EP EP06712095A patent/EP1839907B1/en not_active Expired - Fee Related
- 2006-01-20 CN CN200680002760.XA patent/CN101107138B/zh not_active Expired - Fee Related
- 2006-01-20 JP JP2006553975A patent/JP5072368B2/ja not_active Expired - Fee Related
- 2006-01-20 US US11/795,517 patent/US7823616B2/en not_active Expired - Fee Related
- 2006-01-20 DE DE602006019052T patent/DE602006019052D1/de active Active
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JPH0370602A (ja) * | 1989-08-09 | 1991-03-26 | Sumitomo Rubber Ind Ltd | 空気入りラジアルタイヤ |
JP2000142025A (ja) * | 1998-11-12 | 2000-05-23 | Bridgestone Corp | ラジアルタイヤ |
JP2001334811A (ja) * | 2000-05-30 | 2001-12-04 | Sumitomo Rubber Ind Ltd | 空気入りラジアルタイヤ |
JP2002307909A (ja) * | 2001-04-11 | 2002-10-23 | Hyosung Corp | 車両用ラジアルタイヤ |
JP2003252005A (ja) * | 2002-03-01 | 2003-09-09 | Yokohama Rubber Co Ltd:The | 空気入りラジアルタイヤ |
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Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007168709A (ja) * | 2005-12-26 | 2007-07-05 | Bridgestone Corp | 空気入りラジアルタイヤ |
US7882878B2 (en) * | 2006-01-04 | 2011-02-08 | Bridgestone Corporation | Radial tire for airplane |
WO2007122984A1 (ja) * | 2006-04-17 | 2007-11-01 | Bridgestone Corporation | 空気入りタイヤ |
JP2007283896A (ja) * | 2006-04-17 | 2007-11-01 | Bridgestone Corp | 空気入りタイヤ |
WO2007135864A1 (ja) * | 2006-05-23 | 2007-11-29 | Bridgestone Corporation | 空気入りタイヤ |
JP2007313929A (ja) * | 2006-05-23 | 2007-12-06 | Bridgestone Corp | 空気入りタイヤ |
JP2008013035A (ja) * | 2006-07-05 | 2008-01-24 | Bridgestone Corp | 空気入りタイヤ |
WO2008035771A1 (en) * | 2006-09-22 | 2008-03-27 | The Yokohama Rubber Co., Ltd. | Pneumatic radial tire |
JP2008126952A (ja) * | 2006-11-24 | 2008-06-05 | Bridgestone Corp | 空気入りタイヤ |
WO2008062862A1 (fr) * | 2006-11-24 | 2008-05-29 | Bridgestone Corporation | Bandage pneumatique |
US8584724B2 (en) | 2006-11-24 | 2013-11-19 | Bridgestone Corporation | Pneumatic tire |
WO2009041692A1 (ja) * | 2007-09-27 | 2009-04-02 | Bridgestone Corporation | 空気入りタイヤ |
JP2009096456A (ja) * | 2007-09-27 | 2009-05-07 | Bridgestone Corp | 空気入りタイヤ |
WO2009091066A1 (ja) * | 2008-01-18 | 2009-07-23 | Bridgestone Corporation | 空気入りラジアルタイヤ |
JP2009190726A (ja) * | 2008-01-18 | 2009-08-27 | Bridgestone Corp | 空気入りラジアルタイヤ |
JP2010143390A (ja) * | 2008-12-18 | 2010-07-01 | Toyo Tire & Rubber Co Ltd | 空気入りラジアルタイヤ |
Also Published As
Publication number | Publication date |
---|---|
JPWO2006077978A1 (ja) | 2008-06-19 |
CN101107138B (zh) | 2010-05-19 |
EP1839907B1 (en) | 2010-12-22 |
US7823616B2 (en) | 2010-11-02 |
CN101107138A (zh) | 2008-01-16 |
DE602006019052D1 (de) | 2011-02-03 |
JP5072368B2 (ja) | 2012-11-14 |
EP1839907A4 (en) | 2009-07-29 |
EP1839907A1 (en) | 2007-10-03 |
US20080135152A1 (en) | 2008-06-12 |
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