Ink composition, inkjet recording method, printed material, method for producing planographic printing plate, and planographic printing plate

1. An inkjet recording composition comprising an ink composition,

wherein the ink composition comprises:

(A) a polymerization initiator;

(B) an ester of (meth)acrylic acid having 1,3-dioxane ring skeleton represented by the following Formula (I) or an amide of (meth)acrylic acid having a 1,3-dioxane ring skeleton;

wherein each of R 1 to R 8 independently represents a hydrogen atom or a hydrocarbon group; one of R 1 to R 8 has a structure of an ester of (meth)acrylic acid represented by the following Formula (III) as a substituent at a terminal thereof:

wherein R 9 represents a hydrogen atom or a methyl group; and

(C) a colorant.

2. The inkjet recording composition according to claim 1 , wherein the ink composition further comprises a vinyl ether compound.

3. An inkjet recording method, comprising:

(i) ejecting an ink composition onto a recording medium; and

(ii) irradiating the ejected ink composition with active radiation to cure the ink composition,

wherein the ink composition comprises:

(A) a polymerization initiator;

(B) an ester of (meth)acrylic acid having 1,3-dioxane ring skeleton represented by the following Formula (I) or an amide of (meth)acrylic acid having a 1,3-dioxane ring skeleton;

wherein each of R 1 to R 8 independently represents a hydrogen atom or a hydrocarbon group; one of R 1 to R 8 has a structure of an ester of (meth)acrylic acid represented by the following Formula (III) as a substituent at a terminal thereof:

wherein R 9 represents a hydrogen atom or a methyl group; and

(C) a colorant.

4. The inkjet recording method according to claim 3 , wherein the amide of (meth)acrylic acid having a 1,3-dioxane ring skeleton is represented by the following Formula (I):

wherein each of R 1 to R 8 independently represents a hydrogen atom or a hydrocarbon group having 1 to 18 carbon atoms, and at least one of R 1 to R 8 has a structure of an amide of (meth)acrylic acid as a substituent at a terminal thereof.

5. The inkjet recording method according to claim 3 , wherein the ink composition further comprises a vinyl ether compound.

6. A method for producing a planographic printing plate, comprising:

(I) ejecting an ink composition onto a hydrophilic support; and

(II) curing the ink composition by irradiating the ejected ink composition with active radiation so as to form a hydrophobic image region on the hydrophilic support,

wherein the ink composition comprises:

(A) a polymerization initiator;

(B) an ester of (meth)acrylic acid having 1,3-dioxane ring skeleton represented by the following Formula (I) or an amide of (meth)acrylic acid having a 1,3-dioxane ring skeleton;

wherein each of R 1 to R 8 independently represents a hydrogen atom or a hydrocarbon group; one of R 1 to R 8 has a structure of an ester of (meth)acrylic acid represented by the following Formula (III) as a substituent at a terminal thereof:

wherein R 9 represents a hydrogen atom or a methyl group; and

(C) a colorant.

7. The method for producing a planographic printing plate according to claim 6 , wherein the amide of (meth)acrylic acid having a 1,3-dioxane ring skeleton is represented by the following Formula (I):

wherein each of R 1 to R 8 independently represents a hydrogen atom or a hydrocarbon group having 1 to 18 carbon atoms, and at least one of R 1 to R 8 has a structure of an amide of (meth)acrylic acid as a substituent at a terminal thereof.

8. The method for producing a planographic printing plate according to claim 6 , wherein the ink composition further comprises a vinyl ether compound.

9. The inkjet recording composition according to claim 1 , wherein the amide of (meth)acrylic acid having a 1,3-dioxane ring skeleton is represented by the following Formula (I):

wherein each of R 1 to R 8 independently represents a hydrogen atom or a hydrocarbon group having 1 to 18 carbon atoms, and at least one of R 1 to R 8 has a structure of an amide of (meth)acrylic acid as a substituent at a terminal thereof.

10. An inkjet recording composition

wherein the ink composition comprises:

(A) a polymerization initiator;

(B) an ester or amide of (meth)acrylic acid having a 1,3-dioxane ring skeleton which is a compound selected from (B-2)

(C) a colorant.

11. The inkjet recording composition according to claim 1 , wherein a viscosity of the ink composition is from 7 mPa·s to 20 mPa·s at a temperature of from 25° C. to 50° C.

12. An inkjet recording method, comprising:

(i) ejecting an ink composition onto a recording medium; and

(ii) irradiating the ejected ink composition with active radiation to cure the ink composition,

wherein the ink composition comprises:

(A) a polymerization initiator;

(B) an ester or amide of (meth)acrylic acid having a 1,3-dioxane ring skeleton which is a compound selected from the following (B-2)

(C) a colorant.

13. The inkjet recording method according to claim 3 , wherein the viscosity of the ink composition is from 7 mPa·s to 20 mPa·s at a temperature of from 25° C. to 50° C.

14. A method for producing a planographic printing plate, comprising:

(I) ejecting an ink composition onto a hydrophilic support; and

(II) curing the ink composition by irradiating the ejected ink composition with active radiation so as to form a hydrophobic image region on the hydrophilic support,

wherein the ink composition comprises:

(A) a polymerization initiator;

(B) an ester or amide of (meth)acrylic acid having a 1,3-dioxane ring skeleton; and

(C) a colorant,

wherein (B) the ester or amide of (meth)acrylic acid having a 1,3-dioxane ring skeleton is a compound selected from the following (B-2)

15. The method for producing a planographic printing plate according to claim 6 , wherein the viscosity of the ink composition is from 7 mPa·s to 20 mPa·s at a temperature of from 25° C. to 50° C.

16. The inkjet recording composition according to claim 1 , wherein the amide of (meth)acrylic acid having a 1,3-dioxane ring skeleton is represented by the following Formula (I)′:

wherein each of R 1 to R 8 independently represents a hydrogen atom or a hydrocarbon group; one of R 1 to R 8 has a structure of an amide of (meth)acrylic acid represented by the following Formula (IV) as a substituent at a terminal thereof:

wherein R 9 represents a hydrogen atom or a methyl group, and R 10 represents a hydrogen atom or a hydrocarbon group.

17. The inkjet recording method according to claim 3 , wherein the amide of (meth)acrylic acid having a 1,3-dioxane ring skeleton is represented by the following Formula (I)′:

wherein each of R 1 to R 8 independently represents a hydrogen atom or a hydrocarbon group; one of R 1 to R 8 has a structure of an amide of (meth)acrylic acid represented by the following Formula (IV) as a substituent at a terminal thereof:

wherein R 9 represents a hydrogen atom or a methyl group, and R 10 represents a hydrogen atom or a hydrocarbon group.

18. The method for producing a planographic printing plate according to claim 6 , wherein the amide of (meth)acrylic acid having a 1,3-dioxane ring skeleton is represented by the following Formula (I)′:

wherein each of R 1 to R 8 independently represents a hydrogen atom or a hydrocarbon group; one of R 1 to R 8 has a structure of an amide of (meth)acrylic acid represented by the following Formula (IV) as a substituent at a terminal thereof:

wherein R 9 represents a hydrogen atom or a methyl group, and R 10 represents a hydrogen atom or a hydrocarbon group.