Ink set, image recording method, image recorded article, and three-dimensional article and method for producing the same
Provided are an ink set including a first ink including an ethylenic unsaturated compound and a photopolymerization initiator, the first ink not including a colorant or including a white colorant, and a second ink including an ethylenic unsaturated compound, a photopolymerization initiator, and a colorant, wherein the proportion of the amount of a monofunctional monomer to the total amount of the ethylenic unsaturated compound included in the first ink is 95.0% by mass or more, the proportion of the amount of a monofunctional monomer to the total amount of the ethylenic unsaturated compound included in the second ink is 95.0% by mass or more, and, when the static surface tension of the first ink at 25° C. is defined as T1 and the static surface tension of the second ink at 25° C. is defined as T2, the value calculated by subtracting T1 from T2 is 1 mN/m or more, and applications of the ink set.
1 . An ink set comprising:
a first ink including an ethylenic unsaturated compound and a photopolymerization initiator, the first ink not including a colorant or including a white colorant; and
a second ink including an ethylenic unsaturated compound, a photopolymerization initiator, and a colorant,
wherein the ethylenic unsaturated compound included in the first ink includes:
a monofunctional monomer that is a compound including one ethylenic unsaturated group, and a proportion of an amount of the monofunctional monomer to a total amount of the ethylenic unsaturated compound included in the first ink is 95.0% by mass or more; and
a silicone compound having an ethylenic unsaturated group,
wherein the ethylenic unsaturated compound included in the second ink includes:
a monofunctional monomer that is a compound including one ethylenic unsaturated group, and a proportion of an amount of the monofunctional monomer to a total amount of the ethylenic unsaturated compound included in the second ink is 95.0% by mass or more; and
a silicone compound having an ethylenic unsaturated group, and
wherein, when a static surface tension of the first ink at 25° C. is defined as T1 and a static surface tension of the second ink at 25° C. is defined as T2, a value calculated by subtracting T1 from T2 is 1 mN/m or more.
2 . The ink set according to claim 1 ,
wherein the value calculated by subtracting T1 from T2 is 1 to 15 mN/m.
3 . The ink set according to claim 1 ,
wherein the value calculated by subtracting T1 from T2 is 2 to 10 mN/m.
4 . The ink set according to claim 1 ,
wherein the monofunctional monomer included in the first ink includes a compound represented by Formula (A) below, and a proportion of an amount of the compound represented by Formula (A) to the total amount of the ethylenic unsaturated compound included in the first ink is 5.0% by mass or more,
wherein the monofunctional monomer included in the second ink includes a compound represented by Formula (A) below, and a proportion of an amount of the compound represented by Formula (A) to the total amount of the ethylenic unsaturated compound included in the second ink is 5.0% by mass or more, and
wherein, in Formula (A), n represents an integer of 2 to 6.
5 . The ink set according to claim 1 ,
wherein, when a viscosity of the first ink at 25° C. is defined as V1 and a viscosity of the second ink at 25° C. is defined as V2, a ratio of V1 to V2 is 2.0 to 20.0.
6 . The ink set according to claim 1 ,
wherein a content of a thioxanthone compound in the first ink is 0.8% by mass or less of a total amount of the first ink.
7 . An image recording method in which the ink set according to claim 1 is used, the method comprising:
a first application step of applying the first ink to an impermeable substrate;
a first irradiation step of irradiating the first ink deposited on the impermeable substrate with a first active energy ray at an irradiation dose of 1 to 50 mJ/cm 2 ;
a second application step of applying the second ink to the first ink irradiated with the first active energy ray; and
a second irradiation step of irradiating the second ink deposited on the impermeable substrate and the first ink irradiated with the first active energy ray with a second active energy ray at an irradiation dose of 100 mJ/cm 2 or more.
8 . A method for producing a three-dimensional article, the method comprising:
a step of producing an image recorded article including the impermeable substrate and an image by the image recording method according to claim 7 ; and
a step of subjecting the image recorded article to vacuum forming to produce a three-dimensional article.
9 . An image recorded article comprising:
an impermeable substrate; and
an image recorded using the ink set according to claim 1 ,
wherein the image includes a first layer that is a cured product of the first ink and a second layer that is a cured product of the second ink, and
wherein the impermeable substrate, the first layer, and the second layer are arranged in this order.
10 . A three-dimensional article that is an article produced by subjecting the image recorded article according to claim 9 to vacuum forming.
11 . An ink set comprising:
a first ink including an ethylenic unsaturated compound and a photopolymerization initiator, the first ink not including a colorant or including a white colorant; and
a second ink including an ethylenic unsaturated compound, a photopolymerization initiator, and a colorant,
wherein the ethylenic unsaturated compound included in the first ink includes a monofunctional monomer that is a compound including one ethylenic unsaturated group, and a proportion of an amount of the monofunctional monomer to a total amount of the ethylenic unsaturated compound included in the first ink is 95.0% by mass or more,
wherein the ethylenic unsaturated compound included in the second ink includes a monofunctional monomer that is a compound including one ethylenic unsaturated group, and a proportion of an amount of the monofunctional monomer to a total amount of the ethylenic unsaturated compound included in the second ink is 95.0% by mass or more,
wherein, when a static surface tension of the first ink at 25° C. is defined as T1 and a static surface tension of the second ink at 25° C. is defined as T2, a value calculated by subtracting T1 from T2 is 1 mN/m or more, and
wherein, when a viscosity of the first ink at 25° C. is defined as V1 and a viscosity of the second ink at 25° C. is defined as V2, a ratio of V1 to V2 is 2.0 to 20.0.