Actinic radiation-curing type ink composition, inkjet recording method, decorative sheet, decorative sheet molded product, process for producing in-mold molded article, and in-mold molded article

An actinic radiation-curing ink composition comprising:

• (Component A) a monofunctional radically polymerizable monomer;
• and
• (Component B) a polyfunctional acrylate oligomer having a glass transition temperature of no greater than 20° C. and having an acrylate equivalent of at least 300 g/eq,
• (Component E) a resin having a urethane bond in a main chain and having an ethylenically unsaturated group and a polysiloxane structure in a side chain and/or at a terminal,
• Component A comprising (Component A-1) an N-vinyl compound and (Component A-2) an acrylamide derivative,
• Component A having a content of at least 70 mass % of the entire ink composition, and
• Component A-1 having a content of at least 18 mass % of the entire ink composition,
• wherein when the content of Component A-2 in 100 parts by mass of the ink composition is (a-2) (parts by mass) and the content of Component B is (b) (parts by mass), (a-2):(b) mass ratio is 30:1 to 1:1,
• wherein Component A-1 is a compound represented by Formula (A) below
• wherein, in Formula (A), n denotes an integer of 2 to 6,
• wherein Component A-2 is a compound represented by Formula (a-2-1) below
• wherein, in Formula (a-2-1), Ra1 and Ra2 independently denote a hydrogen atom or an alkyl group having 1 to 12 carbons, Ra1 and Ra2 may be bonded to form an alkylene group having 4 to 8 carbons, a hydrogen atom contained in the alkyl group or the alkylene group may be replaced by a hydroxy group, a methylene group contained in the alkyl group or the alkylene group may be replaced by an oxygen atom, a sulfur atom, —CO—, or —NRa3—, and Ra3 denotes a hydrogen atom or an alkyl group having 1 to 6 carbons.