Curing accelerator for oxidatively polymerizable unsaturated resin, printing ink and coating material

A curing accelerator for an oxidatively polymerizable unsaturated resin, comprising:

• a quinolinol compound (A) represented by Structural Formula (2);
• a manganese salt (B);
• and
• a metal salt (C) other than the manganese salt (B):
• wherein R1 is any of a hydrogen atom, a hydrocarbon group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, a hydroxyl group, an amino group, a nitro group, a nitroso group, a sulfo group, and a halogen atom, and n is an integer of 1 to 6;
• wherein the manganese salt (B) is represented by Structural Formula (B-1) or (B-2):
• M(X)2 (B-1)
• MY (B-2)
• wherein,
• M is Mn2+,
• X is F−, Cl−, Br−, I−, PF6−, SbF6−, AsF6−, BF4−, B(C6F5)4−, ClO4−, ClO3−, CO2−, ClO−, H2PO4−, H2PO3−, H2PO2−, HCO3−, NO3−, NO2−, (CH3CO)2CH−, octylate−, neodecanoate−, isononanoate−, an anion of a tung oil fatty acid, an anion of a linseed oil fatty acid, an anion of a soybean oil fatty acid, resinate− or an anion of a tall oil fatty acid, and
• Y is any of O2−, S2−, SO42−, SO32−, and CO32−;
• wherein the metal salt (C) is a fatty acid salt, and the amount of fatty acid in the metal salt (C) is in a range of 1.0 to 4.0 mol with respect to 1 mol of the metal atoms;
• and
• wherein the amount of the metal used in the metal salt (C) is 1 to 100 parts by mass with respect to 1 part by mass of manganese metal in the manganese salt.