WO2006112335A1 - タイヤとリムとの組立体および中空粒子 - Google Patents
タイヤとリムとの組立体および中空粒子 Download PDFInfo
- Publication number
- WO2006112335A1 WO2006112335A1 PCT/JP2006/307773 JP2006307773W WO2006112335A1 WO 2006112335 A1 WO2006112335 A1 WO 2006112335A1 JP 2006307773 W JP2006307773 W JP 2006307773W WO 2006112335 A1 WO2006112335 A1 WO 2006112335A1
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- WIPO (PCT)
- Prior art keywords
- tire
- hollow particles
- pressure
- hollow
- rim
- Prior art date
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Classifications
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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
- B60C29/00—Arrangements of tyre-inflating valves to tyres or rims; Accessories for tyre-inflating valves, not otherwise provided for
- B60C29/06—Accessories for tyre-inflating valves, e.g. housings, guards, covers for valve caps, locks, not otherwise provided for
- B60C29/062—Accessories for tyre-inflating valves, e.g. housings, guards, covers for valve caps, locks, not otherwise provided for for filling a tyre with particular materials, e.g. liquids
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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
- B60C17/00—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
- B60C17/04—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor utilising additional non-inflatable supports which become load-supporting in emergency
- B60C17/06—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor utilising additional non-inflatable supports which become load-supporting in emergency resilient
- B60C17/066—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor utilising additional non-inflatable supports which become load-supporting in emergency resilient made-up of plural spherical elements provided in the tyre chamber
Definitions
- the present invention relates to a tire and rim assembly that realizes a minimum movement to a place where a tire can be repaired after being damaged, safely and reliably.
- it can be realized by combining a general-purpose tire and a general-purpose rim, and is excellent in durability, ride comfort, fuel efficiency and versatility in regular driving before tire damage, and low without sacrificing productivity.
- It relates to a tire and rim assembly that can provide puncture safety at low cost.
- a tire is mounted on a rim, and a large number of bubble-containing particles composed of a continuous phase by coagulation and closed cells held at a pressure higher than atmospheric pressure are enclosed in a space defined by the tire and the rim.
- the safety tire is described in, for example, Patent Document 1 related to the applicant's previous proposal.
- the self-heating occurs.
- the pressure inside the air bubble rises further due to the sudden rise in the temperature of the air bubble-containing particles, so that the air bubble-containing particles expand in volume at a stretch.
- the internal pressure is restored to a pressure close to that before the injury.
- Patent Document 2 discloses that an anti-adhesive agent is disposed around the hollow particles when the hollow particles composed of a continuous phase and a closed cell are formed in the tire. Proposed. This anti-adhesive agent is used for the purpose of preventing the hollow particles expanded by heat generation from fusing together to form a fused product after the function of restoring the internal pressure by the hollow particles after puncture is exhibited. It is for reforming.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2003-118312
- Patent Document 2 Japanese Patent Laid-Open No. 2003-306006
- the adhesion preventing agent described in Patent Document 2 adheres mainly to the surface of the hollow particles with a physical adsorption force or frictional force, the distribution on the surface of the hollow particles is not good. It tends to be uniform. Further, due to the adhesion due to the physical adsorption force or frictional force, the hollow particle surface force anti-adhesive agent may peel off, and the anti-fusing effect may not be sufficiently obtained. In particular, since a large centrifugal force fluctuation input is generated inside the rolling tire, the addition of the anti-adhesive agent causes a large difference in specific gravity between the hollow particles and the anti-adhesive agent. As a result of the separation between the two, the desired effect may not be obtained.
- the anti-adhesive agent when the above-mentioned anti-adhesive agent is filled in the tire together with the hollow particles, it is attached due to the specific gravity difference between the anti-adhesive agent and the hollow particles during rolling of the tire and the centrifugal force at the time of rolling.
- the anti-sticking agent collects on the inner peripheral surface side of the tire.
- the anti-adhesion agent inside the tire is applied from the tread side by the input from the road surface. The movement is repeated such that the tire moves toward the inner side in the radial direction of the tire and jumps and returns to the inner peripheral surface side of the tire again.
- the anti-adhesive agent during this operation tends to cause friction with the hollow particles, and as a result, the temperature of the hollow particles rises and the heat generation durability of the particles may be reduced.
- the present invention provides a hollow particle in a tire and rim assembly in which hollow particles are filled in a tire chamber, for the purpose of surface modification of the hollow particles and prevention of fusion between the hollow particles.
- a means for realizing a uniform distribution of the coating agent on the surface of the hollow particles and strong adhesion to the surface is proposed.
- the gist of the present invention is as follows.
- a tire is mounted on a rim, and a large number of hollow particles composed of a continuous phase and a closed cell by thermal expansion capable of thermal expansion are arranged in a tire chamber defined by the tire and the rim.
- Fixing rate ⁇ (Amount of coating material used) (Amount of precipitate) ⁇ Z (Amount of coating material used) X 100
- An assembly of a tire and a rim characterized by having a coating fixing rate of 90 mass% or more required by the above.
- a separatory funnel add 300 cc of at least one solvent selected also with n- xan, isopropyl alcohol, ethanol and methanol, and hollow particles with a coating agent weighed in the range of 23 g. After stirring for 1 minute, let stand for 10 minutes, drain and collect the precipitate in the funnel, add the solvent again and adjust the solvent in the separatory funnel to 300 cc, then stir, leave and discharge and Sampling is repeated 4 more times for a total of 5 times The amount of the precipitate component is measured as the amount of precipitate after removing the solvent by a conventional method, and the mass percentage with respect to the amount of the original hollow particles is calculated to obtain the amount of precipitate.
- the pressure in the hollow portion of the hollow particle is a high pressure equal to or higher than atmospheric pressure
- the expansion start temperature Ts2 when the hollow particle is heated is 90
- a tire and rim assembly characterized by having a filling rate of 5 vol% or more and 80 vol% or less of the following hollow particles in a range of ° C to 200 ° C.
- Particle volume value Total volume of all hollow particles placed in the tire chamber under atmospheric pressure and the total void volume around the particles (cm 3 )
- Tire chamber volume value After filling the tire / rim assembly with only air and adjusting it to the internal pressure (kPa), the internal air pressure is atmospheric pressure.
- Tire chamber volume value (filled air discharge) / (use internal pressure Z atmospheric pressure)-( ⁇ )
- the use internal pressure is the gauge pressure value (kPa)
- the atmospheric pressure value is absolute using a barometer. Use the value (kPa).
- the hollow particles are obtained by expanding the expandable resin particles to which the coating agent is adhered at a temperature equal to or higher than the melting point Tm of the coating agent. Thread and three-dimensional tires and rims.
- the gas force inside the hollow particles before being arranged in the tire is a gas different from the gas filled in the tire chamber. And assembly.
- the gas inside the hollow particles before being placed in the tire is a non-combustible gas, and the inside of the hollow particles in the tire and rim assembly after the internal pressure is applied.
- a tire and rim assembly, wherein the gas is a mixture of the incombustible gas and the gas filled in the tire chamber.
- the nonflammable gas is a linear or branched aliphatic hydrocarbon having 2 to 8 carbon atoms and a fluoride thereof, or an alicyclic carbon having 2 to 8 carbon atoms.
- R 1 and R 2 are each independently a monovalent hydrocarbon group having 1 to 5 carbon atoms, and part of the hydrogen atoms of the hydrocarbon group may be replaced by fluorine atoms
- the acrylonitrile-based resin is a copolymer comprising at least three monomers of acrylonitrile, methacrylo-tolyl, and methyl methacrylate. Is a copolymer comprising at least three monomers of acrylonitrile, methacrylonitrile and methacrylic acid.
- the average particle size force of the hollow particle group disposed in the tire chamber is in the range of 0 to 200 m, and the average of the hollow particle group A tire / rim assembly characterized by having a true specific gravity in the range of 0.0 1 to 0.06 gZcm 3 .
- a tire chamber pressure drop warning function based on wheel speed detection by a wheel speed sensor of an antilock brake system and a tire chamber by a pressure sensor
- Tire and rim thread and three-dimensional characterized by providing either or both of tire chamber pressure drop warning functions based on a direct pressure measurement method.
- the foam has a substantially spherical shape with a diameter of 1 to 15 mm or a cubic shape with a side of 1 to 15 mm, and an average bulk specific gravity of 0.06 to 0.3 gZcc.
- the tire in which a tire is mounted on a rim, the tire can be thermally expanded by being disposed with a high-pressure gas exceeding atmospheric pressure in a tire chamber defined by the tire and the rim.
- a hollow particle composed of a continuous phase of resin and closed cells, the pressure in the hollow portion being equal to or higher than atmospheric pressure, and a coating agent fixed to the surface via heat on at least a portion of the surface Hollow particles characterized by that.
- Fixing rate ⁇ (Amount of coating material used) (Amount of precipitate) ⁇ Z (Amount of coating material used) X loo
- a separatory funnel add 300 cc of at least one solvent selected also with n- xan, isopropyl alcohol, ethanol and methanol, and hollow particles with a coating agent weighed in the range of 23 g. After stirring for 1 minute, let stand for 10 minutes, drain and collect the precipitate in the funnel, add the solvent again and adjust the solvent in the separatory funnel to 300 cc, then stir, leave and discharge and Sampling is repeated four more times, and the total amount of the precipitated components is weighed as the amount of precipitate after removing the solvent by a conventional method, and the mass percentage with respect to the original amount of hollow particles is calculated to obtain the amount of precipitate.
- the amount of the precipitate is 99 mass of the original amount of hollow particles.
- Hollow particles characterized by being at least%.
- a function capable of stably traveling the required distance even when the tire chamber pressure is reduced after the tire is damaged is developed, and the low speed force under normal traveling is increased.
- the above effects are mainly borne by the hollow particles disposed in the tire chamber.
- the coating agent When the coating agent is applied to the surface of the hollow particles according to the present invention, the coating agent has a surface on the hollow particle surface. Uniform distribution and strong coating on the same surface are realized.
- FIG. 1 is a sectional view in the tire width direction showing an assembly of a tire and a rim according to the present invention.
- FIG. 2 is a diagram showing an example of a “tire valve with a filter” that is used for filling hollow particles and gas, which is mounted on a tire-rim assembly according to the present invention.
- FIG. 1 is a cross-sectional view in the width direction illustrating a safety tire targeted in the present invention.
- a tire 1 is mounted on a rim 2, and in a tire chamber 3 partitioned by the tire 1 and the rim 2, a thermal phase composed of a continuous phase made of resin and closed cells can be thermally expanded.
- a large number of hollow particles 4 are packed and arranged under pressure.
- the tire 1 is not particularly limited in structure as long as it is a tire for various automobiles according to the standard, for example, a tire for trucks and buses, a tire for passenger cars, and the like.
- the present invention is a technology that can be applied to all safety tires that are an assembly of a tire and a rim.
- reference numeral 9 indicates a valve for supplying and discharging gas to and from the tire chamber 3
- 10 indicates an inner liner layer
- 11 indicates a side portion
- 12 indicates a void around the hollow particle 4.
- the hollow particles 4 have closed cells surrounded by a continuous phase of a substantially spherical resin, for example, a hollow body having a particle size distribution in the range of about 10 ⁇ m to 500 ⁇ m. Or, it is a spongy structure containing a large number of small cells with closed cells. That is, the hollow particles 4 are particles that enclose closed closed cells that do not communicate with the outside, and the number of closed cells may be singular or plural. In this specification, this “inside of closed cells of a hollow particle group” is generically expressed as “hollow part”.
- the fact that the particles have closed cells means that the particles have a “wax-made shell” for enclosing the closed cells in a sealed state. It refers to the “continuous phase on the component composition that constitutes the coconut shell”.
- the composition of the coconut shell is as described later.
- the hollow particle group which is a large number of the hollow particles 4, is filled and arranged inside the tire chamber 3 together with the high-pressure gas, so that the "internal pressure" of the tire is partially applied under normal use conditions. At the same time, when the tire 1 is injured, it becomes a source of the function of restoring the lost pressure in the tire chamber 3. This “internal pressure restoration function” will be described later.
- in-use pressure refers to “a tire chamber pressure value (gauge pressure value) specified by an automobile manufacturer for each vehicle for each mounting position”.
- hollow particles are obtained by heating and expanding “swellable resin particles” that are raw materials, that is, particles encapsulated in a resin using a gas component as a foaming agent in a liquid state. There is an expansion start temperature Tsl. Furthermore, it is obtained by this thermal expansion. When the resulting hollow particles are heated again from room temperature, the hollow particles start to expand further, where the expansion start temperature Ts2 of the hollow particles exists.
- Tsl an index of heat resistance.
- Ts2 is appropriate as an index of heat resistance. I came to find out.
- the expansion behavior when the expandable rosin particles were heated and expanded was observed. Since the expandable rosin particles are in the stage before expansion, the thickness of the rosin shell, whose particle size is extremely small compared to the state of the hollow particles, is extremely thick. Therefore, the microcapsule is highly rigid. Therefore, even if the continuous phase of the resin-made shell exceeds the glass transition point during the expansion process, the expansion force of the internal gas will increase the rigidity of the shell until the shell is softened to some extent by further heating. I can't win. Therefore, Tsl is higher than the actual glass transition point of the shell.
- Ts2 is positioned lower than Tsl because the continuous phase of the shell begins to expand as soon as it exceeds the glass transition point.
- the conventional Tsl is used to discuss the heat resistance.
- Ts2 should be used as an indicator.
- Ts2 of the hollow particles is 90 ° C or higher and 200 ° C or lower. This is because, if the Ts2 of the hollow particles is less than 90 ° C, depending on the tire size selected, the hollow particles may begin to re-inflate before reaching the guaranteed speed of the tire. If the temperature exceeds ° C, even if the temperature rises due to frictional heating of the hollow particles during run flat after puncture damage, the expansion start temperature Ts2 may not be reached. It may not be possible to fully develop the “internal pressure recovery function”.
- Ts2 it is preferable and more preferable to set the range of Ts2 to 90 ° C or more and 200 ° C or less. Is 130 ° C or higher and 200 ° C or lower, and 150 ° C or higher and 200 ° C or lower, most preferably in the range of 160 ° C or higher and 200 ° C or lower.
- a coating material that is fine particles at room temperature and can be fixed by colliding with the surface of the expandable rosin particles that are the raw materials of the hollow particles is used.
- the coating agent is mixed with the expandable resin particles in a high-speed airflow such as a cyclone or a jet mill and collides with both to obtain expandable resin particles with the coating material fixed on the surface. Can do.
- the expandable rosin particles are heated to a temperature equal to or higher than Tsl and expanded, desired hollow particles in which the coating agent is fixed through heat can be obtained.
- the solid fixation of the coating material on the surface of the hollow particles as intended in the present invention specifically means "fixing rate” which is the fixing amount on the surface of the hollow particles with respect to the amount of coating material used. It can be expressed.
- a separatory funnel add 300 cc of at least one solvent selected from n- xan, isopropyl alcohol, ethanol and methanol, and hollow particles with a coating agent weighed in the range of 23 g. After stirring for 1 minute, let stand for 10 minutes, drain and collect the precipitate in the funnel, add the solvent again and adjust the solvent in the separatory funnel to 300 cc, then stir, leave and discharge and Sampling is repeated four more times, and the total amount of the precipitated components is weighed as the amount of precipitate after removing the solvent by a conventional method, and the mass percentage with respect to the original amount of hollow particles is calculated to obtain the “precipitate amount”.
- the "fixing rate” can be determined from the amount of the precipitate and the amount of coating agent actually used for coating according to the following equation.
- Fixing rate ⁇ (Amount of coating material used) (Amount of precipitate) ⁇ Z (Amount of coating material used) X loo
- the fixing rate obtained in accordance with the above is preferably 90 mass% or more. That is, the “precipitate amount” refers to the amount of the coating component in the free state, in other words, the amount of the coating agent that could not be fixed on the surface of the hollow particles.
- the coating particles in the free state have a higher specific gravity than the hollow particles, so that the hollow particles against the centrifugal force fluctuation input in the tires. This is not preferable because it exacerbates heat generation.
- a more preferable fixing rate range is 95 mass% or more and 99 mass% or more.
- the coating agent in fixing the coating agent to the surface of the hollow particle through heat, it is advantageous from the viewpoint of surface modification to cover the entire surface of the hollow particle with the coating agent. It is also effective to partially fix the particles on the surface. In that case, it is preferable that the coating agent is uniformly dispersed on the surface of the hollow particles under the above fixing rate.
- the thermally expandable particles and the coating agent are mixed in a state of thermally expandable particles, which are the raw material of the hollow particles, under a high-speed air current typified by a jet mill or a cyclone,
- the coating agent can be uniformly attached to the surface of the thermally expandable resin particles. With this, if the thermally expandable resin particles are heated and expanded in a desired temperature environment, hollow particles in which the coating agent is uniformly dispersed and fixed can be obtained.
- the amount of coating agent used is more preferably in the range of 320 mass% of the amount of hollow particles.
- the range is preferably 3 to: L0 mass%. This is because if the amount of the coating agent used is less than 3 mass% of the amount of the hollow particles, the above-described effect using the coating agent is difficult to obtain, whereas if it exceeds 20 ma SS %, the coating amount on the surface of the hollow particles becomes excessive.
- the excess specific gravity increases due to the fine particles of the coating material adhering to the surface of the hollow particles, and, as described above, the excess coating particles in the free state have a higher specific gravity than the hollow particles. This is preferable because it induces exothermic deterioration of the hollow particles in response to force fluctuation input.
- an organic acid metal salt particularly a metal acid salt having 14 or more carbon atoms is preferred.
- lithium stearate and magnesium stearate are preferably used. That is, organic acid metal salts such as lithium stearate and magnesium stearate are typical compounds as solid lubricants, and have a good friction coefficient reducing effect over a temperature range below the melting point of the coating agent. Can be obtained.
- the melting point Tm of the coating is lower than the expansion start temperature Ts2 of the hollow particles, the following problems may occur.
- the melting point Tm of the coating is lower than Ts2
- the hollow particles do not reach the expansion start temperature Ts2 during normal running, but a part of the coating melts due to reaching Tm.
- the fluidity of the hollow particles is reduced, or the fusion between the hollow particles is caused.
- the heat generation limit speed originally based on Ts2 that the hollow particles have is greatly reduced, which is not preferable because it becomes an obstacle to the function of restoring the internal pressure. Therefore, it is important that the melting point of the coating material is at least Ts2.
- the melting point Tm of the coating agent is Tsl or more and the heating temperature in the expansion process of the expandable resin particles is higher than Tm, the shell resin of the expandable resin particles is melted. At the same time, melting of the coating agent occurs, so that closer and stronger fixing between them can be achieved, and the surface of the hollow particles can be partially or completely covered with the coating agent.
- the upper limit force Tsl + 150 ° C. or less of the melting point Tm of the coating agent is preferable.
- Tm force Tsl + 150 ° C it is necessary to heat the coating material to a higher temperature in order to expand it while melting. In this case, it is difficult to adjust the degree of expansion.
- the tire and rim assembly is regarded as a pressure vessel.
- the purpose of this purpose is to recover the pressure lost by functioning the hollow particles after temporarily sealing the wound of the pressure vessel damaged by the puncture with the hollow particle group arranged in the tire chamber. Is going to be achieved. Therefore, as with the conventional pneumatic tire described above, running after puncture should not lead to failure or destruction of the tire, that is, the pressure vessel.
- the filling rate of the hollow particles according to the following formula (I) is preferably 5 vol% or more and 80 vol% or less.
- Filling rate of hollow particles (Particle volume value Z tire chamber volume value) X 100 1- (I) [0065]
- the particle volume value is the atmospheric pressure of all the hollow particles arranged in the tire chamber. This is the total amount (cm 3 ) of the total volume and the void volume around the particle, and can be calculated by the following method.
- the average bulk specific gravity of the particles under atmospheric pressure is determined.
- the method is calculated, for example, by measuring the weight of a known volume under atmospheric pressure.
- the average bulk specific gravity under the atmospheric pressure is calculated. That is, the average bulk specific gravity of the particles under atmospheric pressure is
- Average bulk specific gravity of particles under atmospheric pressure (total weight of particles) / (total volume of particles).
- the “particle volume” arranged inside the tire is calculated. be able to. That is,
- Particle volume (Total weight of particles filled in tire) Z (Average bulk density of particles under atmospheric pressure)
- particles having a desired particle volume can be arranged in the tire by a method of measuring the particles in a container having a known volume and arranging the particles in the tire chamber.
- the tire chamber volume value is determined by filling the tire / rim assembly with only air and using the internal pressure of the tire.
- Tire chamber volume value (filled air discharge) / (use internal pressure Z atmospheric pressure)-( ⁇ )
- the use internal pressure is the gauge pressure value (kPa)
- the atmospheric pressure value is the absolute value from the barometer. (kPa) is used. That is, the atmospheric pressure is a force represented by 0 [kPa] in gauge pressure. Since the atmospheric pressure value itself fluctuates from day to day, the absolute value observed at that time is used. Thus, for example, when the atmospheric pressure at a certain time is 1013 hPa, 101.3 kPa is used as the absolute value of atmospheric pressure in the formula (II).
- the pressure in the tire chamber is set to a desired use internal pressure such as a mounting vehicle designated internal pressure. It is important to fill with high-pressure gas such as air or nitrogen.
- high-pressure gas such as air or nitrogen.
- the pressure in the hollow portion of the hollow particles pressure in closed cells
- the particles are reduced in volume because they are less than the pressure in the tire chamber.
- the shape of the hollow particles is not a substantially spherical shape, but is a distorted shape with a flat spherical force.
- the hollow particles are more likely to break due to particle collisions and collisions with the tire and rim inner surface than in the spherical shape. Become. That is, when the hollow particles are flattened and distorted, the input due to the collision cannot be uniformly dispersed, resulting in a great disadvantage in terms of durability.
- the hollow particles distorted due to flattening are in a state where the volume is reduced due to the difference between the pressure in the hollow portion and the pressure in the tire chamber, but the tire chamber (particle By maintaining the pressure in the voids), the pressure in the hollow part of the hollow particle, in other words, the pressure in the closed cell in the particle can be increased to the pressure of the tire chamber. That is, since the flattened hollow particles are deformed, a force is exerted on the shell portion to return to the original substantially spherical shape. In addition, since the pressure in the hollow portion of the flattened hollow particles is lower than the pressure in the tire chamber, the gas molecules in the tire chamber are dispersed in a continuous phase due to resin in order to eliminate the pressure difference.
- the hollow part of the hollow particle is a closed cell and the gas therein is filled with the gas caused by the foaming agent, it may be different from the gas in the tire chamber (the void around the particle).
- the high-pressure gas in the tire chamber permeates into the particle hollow portion until the partial pressure difference is eliminated.
- the high-pressure gas in the tire chamber permeates into the hollow portion of the hollow particles with time, so that the pressure in the tire chamber is reduced by the amount permeated into the hollow portion. Therefore, the tire of the present invention adjusted to a desired use internal pressure can be obtained by continuously applying a desired pressure after filling with a high-pressure gas in order to compensate for the permeation into the hollow part of the hollow particles.
- the high-pressure gas is interposed around the hollow particles, so that the load imposed on the hollow particles during normal running can be reduced to a negligible level. Since the volume of the hollow particles recovers to a nearly spherical shape, the fatigue and fracture applied to the particles due to repeated deformation during rolling of the tire can be greatly reduced. Will not be damaged.
- the range in which the durability of the hollow particles is not impaired is that the pressure in the hollow portion of the particles increases while the pressure in the tire chamber recovers the volume in the desired high-pressure environment such as the specified internal pressure of the vehicle to be installed.
- the pressure of the hollow part of the hollow particles is at least 70% with respect to the desired pressure in the tire chamber. Furthermore, it is recommended to set a high value of 80% or more, 90% or more, and 100% or more.
- a void gas around the hollow particles can be obtained.
- the pressure should be maintained at a level that is at least 70% higher than the desired pressure in the tire chamber, such as the vehicle-designated internal pressure to be installed, and an appropriate period of time may be allowed to remain applied.
- the hollow particles are placed in a pressure vessel separate from the tire, and the air pressure around the particles is maintained at least 70% higher than the desired pressure in the tire chamber, and this pressure is applied. It is also possible to place the particles with the increased pressure inside the hollow part of the hollow particles in the tire chamber together with the surrounding atmosphere after storing them in the pressure vessel for an appropriate time. An assembly of tires and rims can be obtained.
- the appropriate retention time described above takes into account the permeability of the void gas to the shell portion of the hollow particle, that is, the continuous phase of the particle, and the partial pressure difference between the gas in the particle hollow portion and the void gas. Can be set.
- the type and pressure of the gas filled in the tire chamber are appropriately selected and adjusted, so that the hollow particles
- the pressure in the hollow portion of the child can be set to a desired range.
- the hollow space pressure of the hollow particles is defined to be at least 70% of the vehicle-designated tire internal pressure during normal running use, but the sealing ability of the damaged portion depends on the hollow pressure. That is, it has been described above that the substantially spherical shape can be maintained if the hollow portion pressure is 70% or more. However, since the good fluidity and elasticity can be expressed by maintaining the substantially spherical shape, the internal pressure of the hollow portion is low. Compared to the case, the sealing limit of the damaged part is greatly improved.
- the air chamber pressure decreases, the amount of tire stagnation increases and the tire air chamber volume decreases. Furthermore, when the air chamber pressure decreases, the tire sags greatly, and the hollow particles disposed in the tire air chamber are subjected to compression and shear while being sandwiched between the tire inner surface and the rim inner surface.
- the pressure in the hollow portion of the hollow particles that existed under the above-mentioned use internal pressure remains high after the damage while maintaining a high pressure according to the use internal pressure.
- the hollow particles themselves directly bear the load, but the hollow particles cause friction and self-heat, so that the temperature of the hollow particles in the tire chamber rises rapidly.
- this temperature is the thermal expansion start temperature of the hollow particles.
- Ts2 corresponding to the glass transition temperature of the resin
- the pressure in the hollow part of the hollow particle is a high pressure corresponding to the working internal pressure, and the hollow part pressure is further increased due to the sudden rise in the temperature of the hollow particle, Since the surrounding void gas is compressed, the pressure in the tire chamber can be recovered to at least the pressure in the tire chamber where the side portion of the tire does not come into contact with the ground.
- the pressure in the hollow part of the hollow particles is set to a high pressure that enables thermal expansion by the above mechanism, the function of restoring the internal pressure can be exhibited.
- hollow particles whose pressure in the hollow portion is at least 70% of the used internal pressure are reduced to 5 vol% or more and 80 vol% or less. It is important to place it in the tire chamber under the filling rate. The reason is shown below.
- the filling rate of the hollow particles is less than 5 vol%, the wounded part can be sealed without any problem, but the absolute amount of the hollow particles is insufficient, so the side part is not grounded and the pressure level is not reached. It will be difficult to obtain sufficient internal pressure.
- the filling ratio of the hollow particles exceeds 80 vol%, some tires expand due to the heat generated by particle friction during high-speed running during normal use, resulting in expansion exceeding the above-described expansion start temperature (Ts2) of the hollow particles. As a result, the internal pressure restoration function, which is the main function of the present invention, may be lost. The heat generation of the particles at high speed during normal use will be described later.
- the hollow particles are particles having a low specific gravity and high elasticity due to the hollow structure, when the tire is damaged and void gas around the hollow particles starts to leak from the damaged portion, the hollow particles get on the flow due to the leakage of the void gas. Immediately close to the wounded area and instantly seal the wounded area.
- the function of sealing the damaged part by the hollow particles is an essential function that supports the function of restoring the internal pressure of the present invention.
- the volume of the tire chamber decreases with the decrease in the internal pressure after the puncture and the amount of stagnation of the tire increases. By causing friction between the particles, the temperature rises rapidly and the internal pressure is restored by the expansion of the particles, enabling safe driving after puncture.
- the friction between the hollow particles in the tire and rim assembly is generated even though the friction is small even under normal traveling.
- the traveling speed is less than lOOkmZh, the balance is maintained by the heat radiation to the outside air by traveling with the generated frictional heat itself being small.
- the tire rotates at a high speed to generate a centrifugal force corresponding to the speed.
- the hollow particles arranged in the tire chamber are also subjected to the same centrifugal force.
- This centrifugal force is proportional to the weight of the particles, proportional to the square of the speed, and inversely proportional to the tire radius.
- a certain amount of stagnation is generated by applying a load to the tire, and the grounding area is in a state parallel to the road surface. The force is almost zero. Therefore, the hollow particles in the tire and rim assembly that rotates while bearing a load are subjected to centrifugal force as described above in the non-grounded region, but on the other hand, the centrifugal force immediately enters the grounded region. It is placed under “input of repeated fluctuations of centrifugal force”.
- the particle weight as much as possible for the hollow particle group arranged in the air chamber of the tire. That is, the average true specific gravity of hollow particles should be as small as possible. It is preferable to select and the filling rate of the hollow particles with respect to the tire chamber volume can be within the range of the above-mentioned “filling rate that exhibits a sufficient internal pressure restoration function up to the pressure level at which the side part does not contact the ground”. It is preferable to select a small filling rate as much as possible.
- the filling rate of the hollow particles is less than 5 vol%, it may be difficult to obtain a sufficient reviving internal pressure up to the pressure level where the side portion does not touch the ground depending on the tire.
- the filling rate of hollow particles exceeds S80vol%, some tires generate heat due to particle friction during high-speed running during normal use, resulting in expansion exceeding the expansion start temperature of the hollow particles described above, and the present invention. This is not preferable because the internal pressure restoration function, which is the main function of, may be lost. Therefore, the preferable range of the air particle filling rate is 5 vol% or more and 80 vol% or less, and further 70 vol% or less, 60 vol% or less, and 50 vol% or less.
- the average true specific gravity of the hollow particles is preferably in the range of 0.01 to 0.06 gZcc. In other words, if it is less than 0. OlgZcc, the durability of the hollow particles under normal running decreases, and the aforementioned “internal pressure restoration function” may be lost during normal use. On the other hand, if it exceeds 0.06 gZcc, it is not preferable because the centrifugal force fluctuation input in the above-mentioned regular high-speed running becomes large and the heat generation amount becomes large.
- the group of hollow particles arranged in the tire chamber has a distribution in the true specific gravity, and each hollow particle does not have the same true specific gravity value.
- the reason for this is the non-uniformity of the thermal history during expansion by heating and the retention of the expanded gas resulting from the foaming agent.
- each expandable rosin particle which is the raw material of hollow particles, expands into a hollow particle by heating, if the heat history at the time of heating is uneven, the heat history is sufficiently received and expanded. The hollow particles and the hollow particles that have stopped expanding in the middle due to the low thermal history received will coexist.
- expandable rosin particles those with a small particle size have a relatively small continuous phase, which is a particle shell (which refers to a skin covering the foaming agent) and a large particle size. Has a thick shell. Even if the heat history during heating is the same, the retention of the expanded gas generated by heating in the hollow particles depends on the absolute thickness of the shell. Therefore, the particle size before expansion is small! / ⁇ "Expandable rosin particles” have a thin shell! As a result, it has hollow particles with low expansion gas retention and low expansion coefficient, and high true specific gravity. Conversely, “expandable resin particles” with large particle diameters are hollow particles with high expansion gas retention and high expansion coefficient due to their thick shells.
- the true specific gravity is reduced. That is, in general, hollow particles obtained by expansion of an expandable composition such as microcapsules have a distribution in particle size in the expanded state, and are hollow particles having a small particle size. The more true the specific gravity is, the more the hollow particles having a larger particle size have a smaller true specific gravity.
- the fully expanded hollow particles have a small true specific gravity
- hollow particles that have stopped expanding in the middle are components having a large true specific gravity.
- a particle group having such a true specific gravity distribution When a particle group having such a true specific gravity distribution is arranged in the tire, it receives a centrifugal force corresponding to the speed under normal internal pressure. At this time, particles having a large true specific gravity are subjected to a greater centrifugal force in the tire chamber than particles having a small true specific gravity. Therefore, a particle group with a small true specific gravity exists in the vicinity of the inner surface of the wheel in the tire and rim assembly, and a hollow particle group with a large true specific gravity gradually exists as the rotational center force is separated.
- the hollow particle group having a large true specific gravity is compared with the hollow particle group having a small true specific gravity.
- a large inertial force is generated below. Therefore, since the hollow particle group having a large true specific gravity moves about to separate the coexisting “hollow particle group having a smaller true specific gravity”, the relative inertia force between the small true specific gravity particle and the large true specific gravity particle is reduced. The difference in kinetic energy due to the difference generates extra interparticle frictional heat, and as a result, the exothermic property of the whole particle is deteriorated.
- the heat generation factor of the hollow particles is the relative inertia force difference of the large true specific gravity particles with respect to the small true specific gravity particles and the frictional heat generation due to their motion.
- the true specific gravity distribution width of the hollow particles For example, for hollow particles with a certain average true specific gravity, the average true specific gravity does not change by removing only the volume ratio of the large true specific gravity side (small particle size side) and the small true specific gravity side (large particle size side) force. In both cases, since the true specific gravity distribution can be narrowed, the above-mentioned difference in relative inertial force can be suppressed. Thus, heat generation of the entire hollow particle group can be suppressed.
- the average particle size of the hollow particles is preferable! /, And the range is from 40 ⁇ m force to 200 ⁇ m.
- the average particle size of the hollow particles is less than 40 m, the above-mentioned true specific gravity distribution spreads, and the exothermic property is increased due to the relative inertia force difference of the large true specific gravity particle group with respect to the small true specific gravity particle group and the frictional heat generated by the motion. Since it worsens, it is not preferable.
- the average particle size force S of the hollow particles exceeds 200 m, the situation is such that the particles collide with each other under normal running, or when the tire chamber pressure becomes atmospheric pressure due to the nk. In a situation where the hollow particle group directly supports the load at the particle size, it is preferable because the particle force on the large particle size side may be selectively broken, resulting in a disadvantage that the desired running performance after puncture may not be obtained. Absent.
- the gas constituting the hollow part (closed cell) of the hollow particle includes nitrogen, air, linear and branched aliphatic hydrocarbons having 2 to 8 carbon atoms, their fluorides, and carbon numbers. 2 to 8 alicyclic hydrocarbons and their fluorides, and the following general formula (III):
- R 1 and R 2 are each independently a monovalent hydrocarbon group having 1 to 5 carbon atoms, and part of the hydrogen atoms of the hydrocarbon group may be replaced by fluorine atoms
- at least one selected from the group consisting of powerful compounds the gas filled in the tire chamber may be air.
- a gas that does not contain oxygen such as nitrogen or an inert gas, is also used for safety. preferable.
- the method of obtaining hollow particles having closed cells is not particularly limited, but a method of obtaining "expandable rosin particles" using a foaming agent and heating and expanding the particles is common.
- the foaming agent include a method utilizing vapor pressure such as a high-pressure compressed gas and a liquefied gas, and a method utilizing a thermally decomposable foaming agent that generates gas by thermal decomposition.
- many pyrolyzable foaming agents are characterized by generating nitrogen.
- the particles obtained by appropriately controlling the reaction of the expandable resin particles obtained have mainly nitrogen in the bubbles.
- the heat-decomposable blowing agent is not particularly limited, but dinitrosopentamethylenetetramine, azodicarbonamide, paratoluenesulfonylhydrazine and its derivatives, and oxybisbenzenesulfurhydrazine may be preferably mentioned. it can.
- R 1 and R 2 are each independently a monovalent hydrocarbon group having 1 to 5 carbon atoms, and part of the hydrogen atoms of the hydrocarbon group may be replaced by fluorine atoms
- This is a technique in which at least one selected from the group consisting of etheric compounds represented by the following formula is liquefied under high pressure as a foaming agent and dispersed in a reaction solvent, followed by emulsion polymerization.
- This makes it possible to obtain “expandable rosin particles” in which the gas components shown above are contained in a liquid foaming agent in the previous operation as a liquid foaming agent. You can get empty particles.
- the gas sealed in the hollow portion of the particles at a predetermined pressure is discharged to the outside of the particles.
- the resin constituting the continuous phase is made of a material having low gas permeability, specifically, at least one of acrylonitrile copolymer, acrylic copolymer, and vinylidene chloride copolymer is used. It is important. These materials are particularly effective in the present invention because they have flexibility as hollow particles with respect to input due to tire deformation.
- an acrylonitrile polymer an acrylic polymer, and a salt vinylidene polymer to the continuous phase of the hollow particles. More details Monomer power constituting the polymer Acrylonitrile, methacrylonitrile, methylmethacrylate, methacrylic acid, salt, vinylidene power Polymer selected, preferably talix-tolyl Z methacrylonitrile Z methylmethacrylate Polymer, acrylonitrile z methacrylo-tolyl Z methacrylic acid terpolymer power At least one of each selected is advantageously matched. Since these materials all have a small gas permeability coefficient and are difficult for gas to permeate, the pressure in the hollow portion where the gas in the hollow portion of the hollow particles hardly leaks to the outside can be appropriately maintained.
- the continuous phase of the hollow particles, 30 ° gas permeability at C is 300 X 10- 12 (cc'cm / cm 's'cmHg) or less, preferably the gas permeability coefficient at 30 ° C 20X 10 - 12 (cc'c m / cm 2 's'cmHg) or less, more preferably the gas permeability coefficient at 30 ° C is 2 X 10- 12 (cc'cmZcm 2' is recommended that at S'cmHg) less.
- the greater gas permeability coefficient inner liner in a conventional pneumatic motor I catcher In the 300 X 10- 12 (cc ⁇ cm / cm 2 ⁇ s ⁇ c mHg) below the level of sufficient internal pressure retaining function in view of the results in which, for the continuous phase of the particles, was the gas permeability at 30 ° C 300X10- 12 (cc'cmZcm 2 -sc mHg) below.
- the maintainability of the point force peach 20X10- 12 (cc-cm / cm 2 's'cmHg ) or less, still more preferably not be a 2X 10- 12 (cc'cm / cm 2 's'cmHg) below.
- the average bulk specific gravity is the average true specific gravity of the hollow particles in order to enhance the sealing function of the tire damage portion when the tire is damaged.
- a means for mixing a large number of larger foams in the hollow particle group is effective. Specifically, it has a substantially spherical shape with a diameter of 1 to 15 mm or a cubic shape with a side of 1 to 15 mm, has independent or open cells, has an average bulk specific gravity of 0.06 to 0.3 gZcc, and an average particle size.
- the hollow particles have a substantially spherical shape, the flowability is high, so that the introduction locuser having a small inner diameter such as a tire valve can be easily disposed in the tire chamber.
- the force of the damaged portion also collects on the inner surface of the damaged portion so that the hollow particles blow out to the outside of the tire together with the high pressure gas in the tire chamber.
- the inner surface force of the damaged part also has a complicated intricate shape rather than a straight line to the outer peripheral surface of the tire, the particles that also enter the inner surface of the tire are obstructed by the path along the path.
- the hollow particles gather on the inner surface of the damaged part in a compressed state, and the damaged part is temporarily sealed.
- provisionally sealing refers to a state in which the hollow particles themselves do not leak but the void gas around the particles gradually leaks.
- the foam having a large bulk specific gravity is unevenly distributed to one side of the inner liner of the tire, and the hollow particles having a small true specific gravity are unevenly distributed to the side closer to the rotation center than the foam.
- the foam is unevenly distributed in the vicinity of the inner liner surface on the inner surface of the tire. It is very effective because it seals the wounded part by promptly adhering to the inner surface of the wounded part of the wounded part to blow out to the outside.
- the foam is a foam made of thermoplastic urethane having open cells
- thermoplastic urethane having open cells it is easy to closely adhere to the shape of the wound having high compressibility, and as a result, a large wound is extremely close to the foam.
- the tire chamber pressure drop alarm function based on the wheel speed detection by the wheel speed sensor of the anti-lock brake system and the tire chamber pressure by the pressure sensor are further described. It is preferable to have either or both of the tire chamber pressure drop warning function based on the direct measurement method.
- the internal pressure is restored by the above-described mechanism. It may not be attached. However, since the tire itself is damaged by puncture, it is very dangerous to continue running as it may cause the tire to break down. Therefore, it is preferable to use the above-mentioned tire internal pressure drop alarm function together.
- a tire noble for use in filling with hollow particles and gas.
- the tire valve includes a filter that blocks the hollow particles in the tire chamber and allows only the gas to pass outside the tire chamber.
- the tire valve has a structure including a filter 13 that can be made of, for example, a non-woven fabric, with respect to the air supply / exhaust valve 9 attached to the valve mounting port 14 of the rim 2. To do.
- a rim of the size shown in Table 1 was incorporated into a tire of the size shown in Table 1, and an assembly of a tire for a passenger car and a rim was prepared.
- the tire 1 follows the general structure of the tire type and size.
- select the target vehicle for the tire size mount a load equivalent to a four-seater ride, fill it with high-pressure air, adjust the pressure in the tire chamber to 200 kPa, and combine each tire and rim.
- a solid was mounted on the left side of the front shaft.
- the tire chamber pressure was gradually released while keeping the load applied, and the tire chamber pressure value at which the tire side contacted the road surface or the inner liner inner surfaces contacted each other was obtained. .
- This tire chamber pressure value was defined as the “RF running limit internal pressure value”.
- Procedure 1 Fill the tire and rim assembly with air at normal temperature while maintaining a state where no load is applied, and adjust to the specified internal pressure (operating internal pressure) P. At this time, the target tire under P
- Step 2 Open the tire valve and release the air in the tire chamber to atmospheric pressure P.
- the integrated flow meter includes a DC DRY gas meter DC-2C manufactured by Shinagawa Seiki Co., Ltd.
- Tire chamber volume value (filled air discharge amount) / (use internal pressure Z atmospheric pressure)-( ⁇ )
- the tire chamber volume V at the use internal pressure P can be obtained.
- equation (II) the gauge pressure value (kPa) was used for the internal pressure, and the absolute value (kPa) measured by the barometer was used for the atmospheric pressure value.
- the tire / rim assembly was filled with nitrogen and adjusted to the working internal pressure. After investigating the particle volume recovery behavior based on the following investigation method in advance, the retention time corresponding to the target pressure in the hollow part is determined, and the tire chamber is heated in a heated room maintained at room temperature or 45 ° C. The assembly of the tire and rim to be evaluated was prepared while maintaining the pressure to increase the hollow part pressure of the hollow particles and recover the particle volume.
- a method for determining an appropriate holding time for increasing the pressure in the hollow portion of the hollow particles!] Is as follows. First, a cylindrical pressure vessel made of acrylic resin having a constant inner cross-sectional diameter of about 1000 cm 3 and a transparent inner diameter is prepared, and the hollow particles of the present invention are applied to the vessel while vibrating in an ultrasonic water bath or the like. Until the container is full. Next, the container was filled with a gas for filling the tire chamber until a desired working pressure such as a vehicle specified internal pressure was reached. As the pressure increases, the volume of the particles in the container decreases, and the height inside the container of the portion filled with the hollow particles (hereinafter referred to as the hollow particle height) decreases.
- the container When the internal pressure of the container reached the target pressure, the container was vibrated for 5 minutes with an ultrasonic water bath or the like and then allowed to stand for 5 minutes. Then, when the height of the hollow particles in the container was stabilized, the height of the hollow particles was measured and set as “hollow particle height at the start of pressurization: Hl”. Furthermore, the above operating pressure was continued for 4 hours, and “the height of airborne particles after a certain period of time: Hx” was measured.
- Particle volume recovery rate (%) [(Hx—H1) Z (H2—Hl)] X 100
- the time to reach the target volume recovery rate is determined, and after filling the assembly of the tire and rim with the hollow particles filled with the gas of the desired pressure, the above is determined.
- the internal pressure of the hollow part of the hollow particles was increased by applying a recovery treatment of the total particle volume according to the holding time.
- Desired internal pressure P by placing hollow particles in the tire chamber
- the pressure inside the tire chamber is adjusted to the atmospheric pressure P by opening the tire valve. Measure the air discharge V by letting it flow into the total flow meter while discharging. And the following formula
- the volume of hollow particles decreases and the void volume around the particles increases accordingly. Therefore, the above measurement was started from a sufficiently low pressure level, and the pressure level at which the void volume around the particle began to increase tl was taken as the pressure level in the hollow part of the hollow particle.
- Table 2 The types of compositions constituting the continuous phase of the hollow particles in Table 1 are shown in Table 2.
- the expandable resin particles shown in Table 2 were heated and expanded to form hollow particles.
- the coating agent was attached to the expandable rosin particles, and then heated and expanded.
- Table 3 shows the results of measuring the average particle size and average true specific gravity of the particles obtained by force.
- the hollow particles shown in Table 3 were placed in each tire chamber under the filling rate shown in Table 1.
- the average true specific gravity value of the particles is generally measured by a liquid displacement method (Archimedes method), which is a conventional method using isopropanol, and this conventional method is also used in the present invention.
- the method for measuring the average particle size and particle size distribution of the hollow particles is as follows.
- Dispersion pressure 2. OObar, feed: 50.00%, rotation: 60.00%
- the volume-based average particle size is the average particle size value (D50 value) of the present invention.
- the measurement methods of the thermal expansion start temperature Tsl of each expandable resin particle and the reexpansion start temperature Ts2 of each hollow particle are as follows.
- the thermal expansion start temperatures Tsl and Ts2 in Table 2 were measured for the expansion displacement under the following conditions, and used as the temperature at the rise of the displacement.
- Measurement conditions Temperature rise rate 10 ° CZmin, Measurement start temperature 25 ° C, Measurement end temperature 220 ° C, Measurement physical quantity: Measures expansion displacement due to heating.
- the tire and rim assembly adjusted to the internal pressure shown in Table 1 is attached to a drum tester set at a test environment temperature of 38 ° C, and the speed is set to 300 kmZh while applying the load shown in Table 1. I drove for 1 hour. After the running tire was allowed to cool to room temperature, the tire chamber pressure was adjusted to the working internal pressure, and the void volume around the particle after running was measured by the method described above. Further, after hollow particles were completely extracted from the tire chamber, the tire chamber pressure was adjusted again to the working internal pressure, and the tire chamber volume value after running was measured by the same method as described above. Then, by calculating the difference between the above-described post-traveling tire chamber volume and the post-traveling particle peripheral void volume value, the post-traveling hollow particle volume in the tire chamber under the use internal pressure was obtained.
- a passenger car of a class corresponding to each size of tire was set to a loading capacity equivalent to that of four passengers, an evaluation tire was attached to the left front wheel, and the axle weight of the vehicle on the left front wheel was measured.
- four nails with a diameter of 5. Omm and a length of 50 mm were stepped from the tread surface of the assembly toward the inside of the tire, and after confirming that the tire chamber pressure had dropped to atmospheric pressure, 90 km Zh The circumference of the test course was run flat at speed, and the particle temperature in the tire chamber and the chamber pressure were continuously measured to investigate the occurrence of the internal pressure recovery function.
- a pressure sensor for monitoring the tire chamber pressure is incorporated on the inner surface of the rim of the assembly of the tire and rim to be evaluated, and a signal of the measured pressure data is used with a commonly used telemeter.
- the vehicle traveled up to 100 km while measuring changes in pressure by transmitting radio waves and receiving it with a receiver installed inside the test vehicle.
- the internal pressure under run-flat driving is different from the above-mentioned “RF driving limit internal pressure value”, which is the “pressure value of the tire chamber where the side of the tire touches the road surface or the inner surfaces of the inner liners are in contact with each other”. If the pressure inside the tire chamber was superior due to the resurrection function, it was judged acceptable.
- Comparative Example 1 is an example in which a coating agent is not used, and a decrease in the volume of hollow particles of 10 vol% or more is observed.
- Comparative Example 2 is an example in which Li stearate is directly added to the hollow particles, and the fixability on the surface of the hollow particles is poor, so that the amount of precipitate is large. Therefore, the coating agent did not function sufficiently on the surface of the hollow particles, resulting in a low volume retention of the hollow particles.
- Invention Examples 1 and 2 are examples in which hollow particles were obtained by fixing the coating agent to the surface of the expandable resin particles and then expanding it at a temperature equal to or higher than the melting point Tm of the coating agent. Although the basic performance is sufficient, the volume of the hollow particles rises while traveling below the Tm force Ts2, and partly melts and the fluidity of the hollow particles is impaired.
- Inventive Examples 3 and 4 adhere a coating agent having a Tm higher than Ts2 to the surface of the expandable resin particles.
- the hollow particles are obtained by expanding at a temperature of Tm or higher, exhibiting good durability, and the volume retention of the hollow particles is high.
- Inventive Example 5 is an example in which a coating agent having a Tm higher than Ts2 is fixed to the surface of the expandable resin particles and expanded at a temperature lower than Tm to obtain hollow particles, and has sufficient performance. However, some precipitates are generated and the volume of the hollow particles is slightly reduced.
- Invention Example 6 is an example in which a coating agent having a Tm higher than Ts2 is fixed to the surface of the expandable resin particles, and expanded at a temperature higher than Tm to obtain hollow particles, which have good durability. The volume retention of hollow particles is also high.
- Inventive Example 7 is an example in which a coating agent having a Tm higher than Ts2 is fixed to the surface of the expandable resin particles and expanded at a temperature lower than Tm to obtain hollow particles.
- the use of durability improvers is increasing.
- the fixability of the coating agent is lower than that of Invention Example 5, and precipitates are generated accordingly, and the volume of hollow particles is slightly reduced.
- Methyl / -Fluoro-Ville I-Tell is a mixture of both normal structure and iso structure.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
- Paints Or Removers (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/911,281 US20090078355A1 (en) | 2005-04-14 | 2006-04-12 | Tire/rim assembly and hollow particles |
CN2006800212850A CN101198481B (zh) | 2005-04-14 | 2006-04-12 | 轮胎和轮圈的装配体及空心粒子 |
JP2007521208A JP4994231B2 (ja) | 2005-04-14 | 2006-04-12 | タイヤとリムとの組立体および中空粒子 |
EP06731709.9A EP1870256B1 (en) | 2005-04-14 | 2006-04-12 | Assembly of tire and rim, and hollow particle |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2005-117093 | 2005-04-14 | ||
JP2005117093 | 2005-04-14 |
Publications (1)
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WO2006112335A1 true WO2006112335A1 (ja) | 2006-10-26 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2006/307773 WO2006112335A1 (ja) | 2005-04-14 | 2006-04-12 | タイヤとリムとの組立体および中空粒子 |
Country Status (5)
Country | Link |
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US (1) | US20090078355A1 (ja) |
EP (1) | EP1870256B1 (ja) |
JP (1) | JP4994231B2 (ja) |
CN (1) | CN101198481B (ja) |
WO (1) | WO2006112335A1 (ja) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004243985A (ja) * | 2003-02-17 | 2004-09-02 | Bridgestone Corp | タイヤとリムとの組立体およびこの組立体に充填する粒子群 |
JP2004255981A (ja) * | 2003-02-25 | 2004-09-16 | Bridgestone Corp | タイヤとリムとの組立体およびこの組立体に充填する粒子群 |
JP2005035545A (ja) * | 2001-03-21 | 2005-02-10 | Bridgestone Corp | 安全タイヤ及びリム組立体と発泡性組成物 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5610454A (en) * | 1979-07-06 | 1981-02-02 | Bridgestone Tire Co Ltd | Complex consisting of steel cord and rubber and its manufacture |
CN1061610C (zh) * | 1995-06-07 | 2001-02-07 | 黄坤炳 | 免充气安全轮胎及其制造方法 |
EP1375197B1 (en) * | 2001-03-21 | 2008-05-07 | Bridgestone Corporation | Assembly of tire and rim |
CN1323856C (zh) * | 2001-03-21 | 2007-07-04 | 株式会社普利司通 | 轮胎-轮辋组合体 |
JP4382331B2 (ja) * | 2001-08-07 | 2009-12-09 | 株式会社ブリヂストン | セルフシール性及びセルフバランシング性に富んだタイヤ−リム組立体 |
-
2006
- 2006-04-12 JP JP2007521208A patent/JP4994231B2/ja not_active Expired - Fee Related
- 2006-04-12 EP EP06731709.9A patent/EP1870256B1/en not_active Ceased
- 2006-04-12 CN CN2006800212850A patent/CN101198481B/zh not_active Expired - Fee Related
- 2006-04-12 WO PCT/JP2006/307773 patent/WO2006112335A1/ja active Application Filing
- 2006-04-12 US US11/911,281 patent/US20090078355A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005035545A (ja) * | 2001-03-21 | 2005-02-10 | Bridgestone Corp | 安全タイヤ及びリム組立体と発泡性組成物 |
JP2004243985A (ja) * | 2003-02-17 | 2004-09-02 | Bridgestone Corp | タイヤとリムとの組立体およびこの組立体に充填する粒子群 |
JP2004255981A (ja) * | 2003-02-25 | 2004-09-16 | Bridgestone Corp | タイヤとリムとの組立体およびこの組立体に充填する粒子群 |
Non-Patent Citations (1)
Title |
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See also references of EP1870256A4 * |
Also Published As
Publication number | Publication date |
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CN101198481A (zh) | 2008-06-11 |
JPWO2006112335A1 (ja) | 2008-12-11 |
EP1870256B1 (en) | 2013-10-30 |
EP1870256A4 (en) | 2012-01-25 |
CN101198481B (zh) | 2010-10-20 |
EP1870256A1 (en) | 2007-12-26 |
US20090078355A1 (en) | 2009-03-26 |
JP4994231B2 (ja) | 2012-08-08 |
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