PRETREATMENT LIQUID, INK SET AND PRINTED MATTER

1 . A pretreatment liquid that can be used together with an aqueous inkjet ink comprising a pigment and water, wherein

the pretreatment liquid comprises a coagulant (A), a surfactant (B), a resin (C) and water,

the coagulant (A) comprises a metal salt that includes at least a polyvalent metal salt, and

the surfactant (B) comprises a polyoxyalkylene alkylamine represented by the following general formula (1).

 [In general formula (1),

R represents a linear or branched alkyl group having 6 to 22 carbon atoms, a linear or branched alkenyl group having 6 to 22 carbon atoms, a linear or branched alkylcarbonyl group having 6 to 22 carbon atoms, or, a linear or branched alkenylcarbonyl group having 6 to 22 carbon atoms.

EO represents an ethylene oxide group, and PO represents a propylene oxide group.

m represents the average addition mole number of EO and is 1 to 100,

n represents the average addition mole number of PO and is 0 to 99, and

m>n.

When n is not 0, there are no restrictions on the addition sequence of the (EO)m and (PO)n, and the addition may be in blocks or may be random.

Further, o represents the average addition mole number of EO and is 1 to 100,

p represents the average addition mole number of PO and is 0 to 99, and

o>p.

When p is not 0, there are no restrictions on the addition sequence of the (EO)o and (PO)p, and the addition may be in blocks or may be random.]

2 . The pretreatment liquid according to claim 1 , wherein the polyvalent metal salt in the coagulant (A) comprises a calcium salt.

3 . The pretreatment liquid according to claim 1 , wherein the surfactant (B) comprises a polyoxyalkylene alkylamine wherein R in the general formula (1) is a linear or branched alkyl group having 8 to 20 carbon atoms, or a linear or branched alkenyl group having 8 to 20 carbon atoms.

4 . The pretreatment liquid according to claim 1 , further comprising an acetylene diol-based surfactant.

5 . The pretreatment liquid according to claim 1 , wherein the resin (C) comprises one or more types of resin particles selected from the group consisting of polyurethane resin particles, polyurethane polyurea resin particles, poly(meth)acrylic resin particles, acrylic-modified polyurethane resin particles, and, polyolefin resin particles.

6 . An ink set comprising:

the pretreatment liquid according to claim 1 , and

an aqueous inkjet ink comprising a pigment and water.

7 . A substrate to which a pretreatment liquid has been applied, having a layer formed from the pretreatment liquid according to claim 1 on the substrate.

8 . A printed matter obtained by printing an aqueous inkjet ink comprising a pigment and water on the substrate to which a pretreatment liquid has been applied according to claim 7 .