Ink jet recording method and ink jet recording apparatus
There is provided an ink jet recording method for recording an image on a recording medium with an aqueous ink and an aqueous reaction liquid containing a reactant that reacts with the aqueous ink. The aqueous ink contains a coloring material that is dispersed by the action of an anionic group. The aqueous reaction liquid contains a water-soluble cationic resin having a structure of a quaternary ammonium salt, and a polyvalent metal salt. The mass ratio of the amount of cationic resin (% by mass) contained to the amount of polyvalent metal salt (% by mass) contained in the aqueous reaction liquid is 0.08 times or more to 0.80 times or less. The amount of water absorbed by the recording medium from the start of contact to 30 msec 1/2 in the Bristow method is 10 mL/m 2 or less.
1 . An ink jet recording method for recording an image on a recording medium with an aqueous ink and an aqueous reaction liquid containing a reactant that reacts with the aqueous ink, the method comprising:
a reaction liquid application step of applying the aqueous reaction liquid to the recording medium; and
an ink application step of applying the aqueous ink in such a manner that the aqueous ink overlaps with at least part of a region of the recording medium to which the aqueous reaction liquid is applied,
wherein the aqueous ink comprises a coloring material that is dispersed by action of an anionic group,
the aqueous reaction liquid comprises a water-soluble cationic resin having a structure of a quaternary ammonium salt, and a polyvalent metal salt,
the polyvalent metal salt comprises a sulfate of a polyvalent metal,
a mass ratio of an amount of the cationic resin (% by mass) contained in the aqueous reaction liquid to an amount of the polyvalent metal salt (% by mass) contained in the aqueous reaction liquid is 0.08 times or more to 0.80 times or less, and
an amount of water absorbed by the recording medium from a start of contact to 30 msec 1/2 in a Bristow method is 10 mL/m 2 or less.
2 . The ink jet recording method according to claim 1 , wherein a counter ion of a cationic group of the cationic resin comprises a chloride ion.
3 . The ink jet recording method according to claim 1 , wherein a degree of cationization (meq/g) of the cationic resin is 4 meq/g or more.
4 . The ink jet recording method according to claim 1 , wherein the cationic resin comprises a dimethylamine·epichlorohydrin resin or a diallyldimethylammonium chloride resin.
5 . The ink jet recording method according to claim 1 , wherein the mass ratio of the amount of the cationic resin (% by mass) contained in the aqueous reaction liquid to the amount of the polyvalent metal salt (% by mass) contained in the aqueous reaction liquid is 0.10 times or more to 0.25 times or less.
6 . The ink jet recording method according to claim 1 , wherein the cationic resin has a weight-average molecular weight of 8,500 or less.
7 . An ink jet recording apparatus used for recording an image on a recording medium with an aqueous ink and an aqueous reaction liquid containing a reactant that reacts with the aqueous ink, comprising:
a reaction liquid application unit configured to apply the aqueous reaction liquid to the recording medium; and
an ink application unit configured to apply the aqueous ink in such a manner that the aqueous ink overlaps with at least part of a region of the recording medium to which the aqueous reaction liquid is applied,
wherein the aqueous ink comprises a coloring material that is dispersed by action of an anionic group,
the aqueous reaction liquid comprises a water-soluble cationic resin having a structure of a quaternary ammonium salt, and a polyvalent metal salt,
the polyvalent metal salt comprises a sulfate of a polyvalent metal,
a mass ratio of an amount of the cationic resin (% by mass) contained in the aqueous reaction liquid to an amount of the polyvalent metal salt (% by mass) contained in the aqueous reaction liquid is 0.08 times or more to 0.80 times or less, and
an amount of water absorbed by the recording medium from a start of contact to 30 msec 1/2 in a Bristow method is 10 mL/m 2 or less.
8 . The ink jet recording method according to claim 2 , wherein a mole ratio of an amount of the chloride ion to an amount of the cationic group of the cationic resin is 1.00 time or more to 2.00 times or less.
9 . The ink jet recording method according to claim 3 , wherein the degree of cationization (meq/g) of the cationic resin is 7 meq/g or less.
10 . The ink jet recording method according to claim 6 , wherein the cationic resin has a weight-average molecular weight of 1,000 or more.
11 . The ink jet recording method according to claim 1 , wherein the amount of the cationic resin (% by mass) contained in the aqueous reaction liquid is 0.10% by mass or more to 10.00% by mass or less, based on a total mass of the aqueous reaction liquid.
12 . The ink jet recording method according to claim 1 , wherein the amount of the polyvalent metal salt (% by mass) contained in the aqueous reaction liquid is 1.00% by mass or more to 3.00% by mass or less.
13 . The ink jet recording method according to claim 1 , wherein the coloring material comprises a pigment.
14 . The ink jet recording method according to claim 1 , wherein the coloring material that is dispersed by the action of the anionic group is at least one of (i) a pigment dispersed by a resin having an anionic group and (ii) a pigment having an anionic group bonded to a particle surface of the pigment directly or via another atomic group.
15 . The ink jet recording method according to claim 1 , wherein an amount of the coloring material (% by mass) contained in the aqueous ink is 0.1% by mass or more to 15.0% by mass or less based on a total mass of the aqueous ink.
16 . The ink jet recording method according to claim 1 , wherein the sulfate of the polyvalent metal comprises at least one selected from the group consisting of magnesium sulfate and aluminum sulfate.
17 . The ink jet recording method according to claim 1 , wherein the recording medium is a plastic film.
18 . The ink jet recording method according to claim 1 , further comprising a step of heating the recording medium having the reaction liquid and the aqueous ink applied thereto,
wherein a heating temperature of the recording medium is 50° C. or higher to 90° C. or lower.