▎ 摘　　要

NOVELTY - Coating composition comprises a dopamine-based compound and a dopamine crosslinking compound including a cyclic hydrocarbon group, a linear hydrocarbon group, and a heterocyclic hydrocarbon group; and at least two crosslinked functional groups having at least one thiol groups. USE - The coating composition is useful as coating member in filter (all claimed). ADVANTAGE - The coating composition improves coating efficiency by improving bonding force between member surface and ceramic coating, can form thicker ceramic coating, prevents discoloration of member even though it contains polydopamine, and improves heat resistance of coating member. The coating member has excellent mechanical properties and heat resistance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for coating member comprising materials; a coating layer located on the surface of the substrate; and a functional coating layer located on the coating layer is formed from the coating composition containing polydopamine and a dopamine crosslinking compound.