Composition for electrochemical device functional layer, laminate for electrochemical device, and electrochemical device

A composition for an electrochemical device functional layer comprising a particulate polymer (X) and a particulate polymer (Y), wherein

• a volume-average particle diameter of the particulate polymer (Y) is smaller than a volume-average particle diameter of the particulate polymer (X),
• one of the particulate polymer (X) and the particulate polymer (Y) includes a reactive monomer unit A and the other of the particulate polymer (X) and the particulate polymer (Y) includes a reactive monomer unit B,
• the reactive monomer unit A is an epoxy group-containing monomer unit or a hydroxy group-containing monomer unit,
• the reactive monomer unit B includes one or more selected from the group consisting of a (meth)acrylamide group-containing monomer unit, an acid anhydride monomer unit, a sulfo group-containing monomer unit, a phosphate group-containing monomer unit, and an amino group-containing monomer unit in a case in which the reactive monomer unit A is an epoxy group-containing monomer unit, and
• the reactive monomer unit B includes one or more selected from the group consisting of a (meth)acrylamide group-containing monomer unit, a carboxy group-containing monomer unit, an acid anhydride monomer unit, a sulfo group-containing monomer unit, a phosphate group-containing monomer unit, and an epoxy group-containing monomer unit in a case in which the reactive monomer unit A is a hydroxy group-containing monomer unit.