Bridgestone Corporation

Daisuke Sugio

Shinichi Eguchi

Ryuji Izumoto

Hideshi Yanagi

Masaki Yoshida

Shinichi Iwasaki

Yuji Takeda

Kazuma Nakazawa

Rieko Iwasaki, Legal Representative

Narukuni Hirata

Haruki Minoshima

Ichirou Yamaguchi

A sealing agent stock solutionis prepared by preparing a mixed solutionby mixing a rubber latex, a resin emulsion and a surfactant, and a predetermined amount of water in a solution preparation vessel, followed by adding an anti-freeze agentto the mixed solution. The sealing agent stock solutionis held (left standing still) at least over for 24 hr or more and preferably over for 48 hr or more without stirring in the solution preparation vessel, followed by filtering the sealing agent stock solutionwith a filter membermade of a mesh filter having the mesh number from 50 to 400 mesh to remove latex aggregatesgenerated in the sealing agent stock solution, and thereby a sealing agentthat does not contain the latex aggregatesis produced.

Process for production of sealing agent

Provided is a method of treating a sealing compound, in order to recover from the inside of a pneumatic tire the sealing compound that was used for repairing a puncture, the sealing compound including an aqueous solution having at least rubber latex dispersed therein, the method comprising: solid-liquid separating, by injecting a treating agent into the inside of a pneumatic tire into which the sealing compound was injected, the treating agent comprising at least one of a salt that is a reaction compound of an acid and a base and/or a water-soluble organic solvent, mixing the treating agent with the sealing compound inside the pneumatic tire, and aggregating and solidifying the rubber latex in the sealing compound.

Method of treating sealing compound and apparatus for treating the same

To be able to simply carry out an operation of repairing a punctured pneumatic tire, to be able to inject a necessary amount of a sealing agent firmly into the pneumatic tire even when the apparatus is used in an inclined state and to prevent clogging of the sealing agent and leakage of a liquid by being pressurized. A pump up apparatusis an apparatus for injecting a sealing agent in a liquid state into a punctured pneumatic tire, thereafter, supplying compressed air into the pneumatic tireto elevate an inner pressure thereof. The pump up apparatusincludes a sealing agent vesselaccommodating the sealing agent, a sealing agent injecting pumpfor sucking the sealing agent from the sealing agent vesselto feed it to the pneumatic tire, and a compressorfor pressurizing and sending air to the pneumatic tire. When the pneumatic tireis punctured, the sealing agent injecting pumpsucks the sealing agent in the liquid state from the sealing agent vesselto inject it to the pneumatic tire, therefore, inside of the sealing agent vesselis not pressurized.

Sealing agent injecting apparatus, sealing agent injecting method and sealing pump up apparatus

To reliably supply a predetermined amount of sealing agent into a pneumatic tire even if the device is inclined and after the predetermined amount of sealing agent is supplied, to automatically start feeding compressed air into the pneumatic tire. In pumping device, when compressed air is supplied to air chamber, internal pressure of air chamberincreases, and as the internal pressure of air chamberrises, a contained volume of air chamberincreases while a contained volume of liquid containerdecreases. Thus, sealing agentin an amount corresponding to the amount corresponding to the reduction in the contained volume of liquid container, is forcibly discharged from discharge outletand the discharged sealing agentis injected into tire. In pumping device, when the air chamberexpands enough to have a predetermined amount of sealing agent to be discharged from the liquid container, the air discharge openingopens toward the air chamberto allow the air chamberto communicate with the inside of tire. Thus, compressed air in the air chambercan be supplied into tirevia the air discharge outlet, bypass hoseand joint hose

Sealing pump-up device

A puncture sealing agent that is excellent in storage stability, and good in puncture sealing properties, and the like, is provided. A puncture sealing agent containing at least a synthetic rubber latex, wherein the gelation ratio as evaluated in a Maron-type mechanical stability test performed in accordance with JIS K 6387 is 0.001 to 10%.

Puncture sealing agent

A puncture sealing agent includes at least a rubber latex solution, a short fiber and a clay base viscosity improver, the viscosity of the rubber latex solution after addition of the clay base viscosity improver being 3 to 6000 mPa&#xb7;s in a range of +50 to &#x2212;20&#xb0; C.

Growing community of inventors

Kodaira, Japan

Daisuke Sugio