Slurry composition for non-aqueous secondary battery functional layer, separator for non-aqueous secondary battery, and non-aqueous secondary battery

A slurry composition for a non-aqueous secondary battery functional layer comprising a binder and a melamine compound, wherein

• the binder is a polymer including at least one functional group selected from the group consisting of a carboxy group, a hydroxyl group, an amino group, an epoxy group, an oxazoline group, a sulfo group, a nitrile group, and an amide group,
• the binder has a volume-average particle diameter of not less than 20 nm and not more than 300 nm,
• the melamine compound has a volume-average particle diameter of not less than 20 nm and not more than 300 nm, where the volume-average particle diameter is measured by laser diffraction and determined as a particle diameter at which a cumulative undersize calculated from a small diameter end of a particle diameter distribution by volume measured by the later diffraction reaches 50%,
• the melamine compound constitutes a proportion of not less than 0.5 mass % and not more than 85 mass % among a total of the binder and the melamine compound.