Self-crosslinkable polymer and aqueous dispersoid of particles containing same

The invention relates to a self-crosslinkable polymer and an aqueous dispersoid of particles containing the same. The self-crosslinkable polymer has a molecular skeleton containing carbamate linking bonds, a hydrazide functional group chemical-bonded to the molecular skeleton and a carbonyl functional group undergoing a reaction with the hydrazide functional group. The aqueous dispersoid can be used as a binder in an aqueous coating composition. The invention also relates to preparation methods of the self-crosslinkable polymer and the aqueous dispersoid, and the coating composition containing the aqueous dispersoid.