Bridgestone Corporation

Haruki Minoshima

Shinichi Eguchi

Daisuke Sugio

Narukuni Hirata

Hideshi Yanagi

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.

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Kodaira, Japan

Haruki Minoshima