Coating composition and method for forming multilayer coating film

A coating composition comprising a resin with a hydroxyl group and an alkoxysilyl group (A), a curing agent (B) and a dispersion of acrylic resin- coated silica particles (C), wherein the dispersion of acrylic resin-coated silica particles (C) is a dispersion of acrylic resin-coated silica particles (C) that is the reaction product of silica particles with a polymerizable unsaturated group (c1) and a polymerizable unsaturated monomer mixture (c2), and the polymerizable unsaturated monomer mixture (c2) includes, as at least a portion of its components, a polymerizable unsaturated monomer having a polysiloxane structure (c21) represented by the following formula (I):

• wherein R1 represents a hydrogen atom or a methyl group, Z represents a structure including the following formula (II), and X represents a hydrogen atom or a (meth) acryloyl, alkyl, hydroxyl, amino, (alicyclic) epoxy, carboxyl, mercapto, vinyl, isocyanate or aryl group,
• wherein m represents a number of 2 to 160, R2 represent phenyl groups or alkyl groups of 1 to 6 carbon atoms, which may be the same or different, and R3 represents an alkylene group of 1 to 6 carbon atoms, and an alkoxysilyl group-containing polymerizable unsaturated monomer (c22), wherein a proportion of the alkoxysilyl group-containing polymerizable unsaturated monomer (c22) in the polymerizable unsaturated monomer mixture (c2) is in a range of 15 mass % to 55 mass % with respect to a total amount of the polymerizable
• unsaturated monomer mixture (c2), and
• wherein the alkoxysilyl group-containing polymerizable unsaturated monomer (c22) is different in structure from the polymerizable unsaturated monomer having a polysiloxane structure (c21).