Planographic printing plate precursor
View Patent ↗The present invention provides a planographic printing plate precursor including a support and a positive recording layer formed on the support and containing: (A) a polymer having a structural unit represented by the following general formula (1), (B) a photo-thermal converting agent, and (C) an amino compound having a methylol group or an alkoxymethyl group; and a positive recording layer whose solubility in an alkaline developer is improved by exposure to light or by heating. In general formula (1), R 1 represents an alkyl group or a cyclic group, x represents 0 or 1, and A represents a bivalent bonding group. According to the invention, a positive planographic printing plate precursor for use with infrared lasers having excellent chemical resistance and wide image development latitude can be obtained.
1. A planographic printing plate precursor comprising:
a support; and
a positive recording layer formed on the support, the positive recording layer including: (A) a polymer having a structural unit represented by the following general formula (1), (B) a photo-thermal converting agent, and (C) an amino compound having a methylol group or an alkoxymethyl group,
wherein the solubility of the positive recording layer in an alkaline developer is improved by exposure to light or by heating:
wherein in general formula (1), R 1 represents an alkyl group or a cyclic group, x represents 0 or 1, and A in general formula (1) is selected from the group consisting of an alkylene group, a connection group represented by the following general formula (2), and a connection group represented by the following general formula (3):
wherein in general formula (2) and general formula (3), x each independently represents 0 or 1, and, in general formula (3), R 3 and R 4 each independently represents a hydrogen atom or an alkyl group.
2. The planographic printing plate precursor according to claim 1 , wherein A in general formula (1) is an alkylene group.
3. The planographic printing plate precursor according to claim 1 , wherein the polymer having a structural unit represented by general formula (1) contains the structural unit represented by general formula (1) in an amount of 5 mass % or more.
4. The planographic printing plate precursor according to claim 1 , wherein the polymer having a structural unit represented by general formula (1) has a weight average molecular weight of from 1,000 to 500,000.
5. The planographic printing plate precursor according to claim 1 , wherein the amino compound has at least two substituents selected from the group consisting of a methylol group and an alkoxymethyl group.
6. The planographic printing plate precursor according to claim 5 , wherein the amino compound (C) includes a structure represented by the following general formula (I):
wherein in general formula (I), T 1 and T 2 each independently represents a hydrogen atom, an alkyl group, an alkenyl group, an acyl group, or an acetyl group.
7. The planographic printing plate precursor according to claim 6 , wherein when T 1 and T 2 in general formula (I) are alkyl groups, the alkyl groups have from 1 to 8 carbon atoms.
8. The planographic printing plate precursor according to claim 6 , wherein the amino compound is an amino compound represented by the following general formula (II):
wherein in general formula (II), R 1 to R 6 each independently represents a hydrogen atom, an alkyl group, an alkenyl group, an acyl group, or an acetyl group.
9. The planographic printing plate precursor according to claim 1 , wherein (B) the photo-thermal converting agent is an infrared light absorbent which has a light absorption region in an infrared region of 750 to 1200 nm.
10. The planographic printing plate precursor according to claim 1 , wherein the positive recording layer further comprises a cyclic acid anhydride as an additive.
11. A planographic printing plate precursor comprising:
a support; and
a positive recording layer formed on the support, the positive recording layer including: (A) a polymer having a structural unit represented by the following general formula (1), (B) a photo-thermal converting agent, and (C) an amino compound,
wherein the solubility of the positive recording layer in an alkaline developer is improved by exposure to light or by heating:
wherein in general formula (1), R 1 represents an alkyl group or a cyclic group, x represents 0 or 1, and A represents a bivalent bonding group,
wherein the amino compound (C) includes a structure represented by the following general formula (I):
wherein in general formula (I), T 1 and T 2 each independently represents an alkenyl group having from 2 to 18 carbon atoms.
12. A planographic printing plate precursor comprising:
a support; and
a positive recording layer formed on the support, the positive recording layer including: (A) a polymer having a structural unit represented by the following general formula (1), (B) a photo-thermal converting agent, and (C) an amino compound,
wherein the solubility of the positive recording layer in an alkaline developer is improved by exposure to light or by heating:
wherein in general formula (1), R 1 represents an alkyl group or a cyclic group, x represents 0 or 1, and A represents a bivalent bonding group,
wherein the amino compound (C) includes a structure represented by the following general formula (I):
wherein in general formula (I), T 1 and T 2 each independently represents an acyl group having from 2 to 18 carbon atoms.
13. A planographic printing plate precursor comprising:
a support; and
a positive recording layer formed on the support,
wherein the positive recording layer comprises a polymer having a structural unit represented by the following general formula (1), and an amino compound having at least two substituents selected from the group consisting of a methylol group and an alkoxymethyl group, and the solubility of the positive recording layer in an alkaline developer is improved by exposure to light or by heating:
wherein in general formula (1), R 1 represents an alkyl group or a cyclic group, x represents 0 or 1, and A in general formula (1) is selected from the group consisting of an alkylene group, a connection group represented by the following general formula (2), and a connection group represented by the following general formula (3):
wherein in general formula (2) and general formula (3), x each independently represents 0 or 1, and, in general formula (3), R 3 and R 4 each independently represents a hydrogen atom or an alkyl group.
14. The planographic printing plate precursor according to claim 13 , wherein the positive recording layer further includes a photo-thermal converting agent.
15. The planographic printing plate precursor according to claim 13 , wherein A in general formula (1) is an alkylene group.
16. The planographic printing plate precursor according to claim 13 , wherein the polymer having a structural unit represented by general formula (1) contains the structural unit represented by general formula (1) in an amount of 5 mass% or more.
17. The planographic printing plate precursor according to claim 13 , wherein the polymer having a structural unit represented by general formula (1) has a weight average molecular weight of from 1,000 to 500,000.
18. The planographic printing plate precursor according to claim 13 , wherein the amino compound comprises a structure represented by the following general formula (I):
wherein in general formula (I), T 1 and T 2 each independently represents a hydrogen atom, an alkyl group, an alkenyl group, an acyl group, or an acetyl group.