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Furthermore, as described above, the compound (A3) may be a polymer compound having a repeating unit. Specific examples of the repeating unit contained in the compound (A3) which is a polymer compound are shown below, but the present invention is not limited thereto. 

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In a case where the compound (A3) having a radical trapping group is a low molecular compound, the molecular weight is not particularly limited, and the molecular weight is preferably 100 to 5,000, more preferably 100 to 2,000, and still more preferably 100 to 1,000. 

Furthermore, in a case where the compound (A3) having a radical trapping group is a polymer compound having a repeating unit, the weight-average molecular weight is pref› erably 5,000 to 20,000, and more preferably 5,000 to 10,000. 

As the compound (A3) having a radical trapping group, a compound that is a commercially available product may be used, and a compound synthesized by a known method may be used. Further, the compound (A3) may be synthesized by the reaction of a commercially available low molecular compound having a radical trapping group with a polymer compound having a reactive group such as an epoxy group, a halogenated alkyl group, an acid halide group, a carboxyl group, and an isocyanate group. 

The content of the compound (A3) having a radical trapping group is usually 0.001% to 10% by mass, and preferably 0.01 % to 5% by mass, with respect to the total solid content of the topcoat composition. 

The topcoat composition may include a plurality of one kind of compound selected from the group consisting of (Al) to (A3). For example, the topcoat composition may also include two or more kinds of the distinctive compounds (Al). 

In addition, the topcoat composition may contain two or more kinds of compounds selected from the group consist› ing of (Al) to (A3). For example, the topcoat composition may also contain both of the compound (Al) and the compound (A2). 

In a case where the topcoat composition includes a plurality of compounds selected from the group consisting of (Al) to (A3), the total content of the compounds is usually 

