into a tire through a valve the liquid coagulant of the invention that contains the blowing agent as described above is excellent in property of coagulating the emulsion to be coagulated and is capable of being injected into a tire without removing the tire from the rim and coagulating a residual tire puncture sealant within the tire the reason for an excellent coagulating property is considered to lie in that the emulsion is reduced in flowability due to foams generated therein by the blowing agent particularly the reason for the fact that the coagulating property is further improved by using as ingredients of the blowing agent a urethane resin and the like having two or more carboxy groups is considered to lie in that foams with a higher strength are generated so that the flowability of the emulsion is further decreased the liquid coagulant of the invention may contain water or a solvent as required from the viewpoint of the capability of being injected into a tire handleability and so forth the solvent is chiefly to be contained if the polyisocyanate compound as above is used as a reactive blowing agent such organic solvents as ethyl acetate acetone and methyl ethyl ketone are suitably mentioned as specific examples of the solvent in terms of the compatibility with water in the emulsion to be coagulated if water or a solvent is contained the water solvent content is preferably 50 to 300 parts by weight and more preferably 100 to 200 parts by weight on 100 parts by weight of the blowing agent as described above exclusive of the hydrogencarbonate salt and water as a reactive blowing agent the liquid coagulant of.