of the same cationic natural rubber latex and sealant tire puncture using

An object of the present invention is to provide a sealant tire puncture, which has a higher sealing ability, storage stability and processability and, therefore, provide a suitable therefor cationic natural rubber latex. The present invention provides the following: contains a cationic natural rubber latex, the cationic natural rubber microparticles whose surfaces are covered by a cationic polymer, wherein the weight average molecular weight of the cationic polymer 3000-150000, a concentration of the cationic natural rubber of 30 to 70% mass% , a viscosity at 20 ° C of 500 mPa · s or less, and the surface potential of the cationic natural rubber microparticles is -3 mV or less, and a sealant tire puncture containing the cationic natural rubber latex and an acid resin emulsion, wherein the mass ratio of the solid content of the cationic natural rubber latex is the solids content of the acidic resin emulsion is from 90:10 to 10:90.