Ink composition, inkjet recording method, and printed matter
The present invention provides an ink composition that contains a pigment, a dispersant, a hydrosoluble solvent; and water, wherein the pigment is represented by the following chemical formula 1: where R represents hydrogen, an alkyl group having one to three carbon atoms, or chlorine, wherein the ink composition satisfies the following relations 1 and 2: 0.050≦ X/Y ≦0.120 Relation 1 0.700≦ Z/Y ≦1.050 Relation 2 where X represents a minimum absorbance in a wavelength range of from 400 nm to 450 nm, Y represents an absorbance of a maximum peak in a wavelength range of from 500 nm to 550 nm, and Z represents an absorbance of a maximum peak in a wavelength range of from 550 nm to 600 nm.
1. An ink composition comprising:
a pigment;
a dispersant;
a hydrosoluble solvent which comprises at least one of 3-ethyl-3-hydroxymethyl oxetane, isopropylidene glycerol, N,N,-dimethyl-β-methoxy propionamide, and N,N-dimethyl-β-butoxy propionamide; and
water,
wherein the pigment is represented by the following chemical formula 1:
where R represents hydrogen, an alkyl group having one to three carbon atoms, or chlorine,
wherein the ink composition satisfies the following relations 1 and 2:
0.050 ≦X/Y≦ 0.120 Relation 1
0.700 ≦Z/Y≦ 1.050 Relation 2
where X represents a minimum absorbance in a wavelength range of from 400 nm to 450 nm, Y represents an absorbance of a maximum peak in a wavelength range of from 500 nm to 550 nm, and Z represents an absorbance of a maximum peak in a wavelength range of from 550 nm to 600 nm, and
wherein the dispersant is represented by the following Chemical formula 2
A 1 -O—B 1 Chemical formula 2
where A 1 represents a linear or branched alkyl group having 8 to 12 carbon atoms, β-naphtyl group, styrenized phenolic group, or distyrenized phenolic group, B 1 represents a COOM 1 , an SO 3 M 1 , or a PO 3 M 1 2 , and M 1 represents Na, K, ammonium, tetramethyl ammonium, or ethanol amine.
2. An inkjet recording method comprising:
applying thermal energy to the ink composition of claim 1 ; and
discharging the ink composition to form an image on a recording medium.
3. An inkjet recording method comprising:
applying mechanical energy to the ink composition of claim 1 ; and
discharging the ink composition to form an image on a recording medium.
4. Printed matter comprising:
a medium; and
an image formed on the medium with the ink composition of claim 1 .
5. Printed matter comprising:
a medium; and
an image formed on the medium using the inkjet recording method of claim 2 .
6. An ink composition comprising:
a pigment;
a dispersant;
a hydrosoluble solvent; and
water,
wherein the pigment is represented by the following chemical formula 1:
where R represents hydrogen, an alkyl group having one to three carbon atoms, or chlorine,
wherein the ink composition satisfies the following relations 1 and 2:
0.050 ≦X/Y≦ 0.120 Relation 1
0.700 ≦Z/Y≦ 1.050 Relation 2
where X represents a minimum absorbance in a wavelength range of from 400 nm to 450 nm, Y represents an absorbance of a maximum peak in a wavelength range of from 500 nm to 550 nm, and Z represents an absorbance of a maximum peak in a wavelength range of from 550 nm to 600 nm, and
wherein the dispersant is represented by the following chemical formula 3:
where p, q, and r independently represent integers of from 5 to 50 , B 1 represents COOM 1 , an SO 3 M 1 , or a PO 3 M 1 2 , where M 1 represents Na, K, ammonium, tetramethyl ammonium, or ethanol amine, and R 1 represents the following polysiloxane structure:
where R 2 represents a hydroxyl group, a methoxy group, or an ethoxy group, R 3 represents a methyl group, an ethyl group, a hexyl group, a hydroxymethyl group, or a hydroxyethyl group, and m represents a counting number of from 1 to 10.
7. The ink composition according to claim 6 , wherein the hydrosoluble solvent comprises at least one of 3-ethyl-3-hydroxymethyl oxetane, isopropylidene glycerol, N,N-dimethyl-β-methoxy propionamide, and N,N-dimethyl-β-butoxy propionamide.
8. An inkjet recording method comprising:
applying thermal energy to the ink composition of claim 6 ; and
discharging the ink composition to form an image on a recording medium.
9. An inkjet recording method comprising:
applying mechanical energy to the ink composition of claim 6 ; and
discharging the ink composition to form an image on a recording medium.
10. Printed matter comprising:
a medium; and
an image formed on the medium with the ink composition of claim 6 .
11. Printed matter comprising:
a medium; and
an image formed on the medium utilizing the inkjet recording method of claim 8 .