Polymerizable composition and planographic printing plate precursor using the same

1. A polymerizable composition comprising:

(A) a compound including a polymerizable unsaturated group; and

(B) a macromolecular compound including, at a side chain thereof, a structure represented by the following general formula (I):

Z − M +   General formula (I)

wherein Z − represents COCOO − , COO − —, SO 3 − , or SO 2 —N − —R where R represents a monovalent organic group and M + represents an onium cation,

wherein the (B) macromolecular compound including, at a side chain thereof, the structure represented by general formula (I) has a structural unit represented by the following general formula (II):

wherein X represents a hydrogen atom, a monovalent organic group, a hydroxyl group, a urethane group, a urea group, a halogen atom, an amino group, an amide group, a sulfonyl group or a sulfonate group, Y represents a divalent organic connecting group, n denotes 0 or 1, Z − represents COCOO − , COO − , SO 3 − or SO 2 —N − —R where R represents a monovalent organic group and M + is an onium cation.

2. A polymerizable composition according to claim 1 , wherein the macromolecular compound (B) comprises a compound for generating radicals by the action of light or heat and has a weight average molecular weight (Mw) of at least 1,000 and no more than 100,000.

3. A polymerizable composition according to claim 1 , wherein Z − of the macromolecular compound (B) represents COCOO − .

4. A polymerizable composition according to claim 1 , wherein M + of the macromolecular compound (B) is selected from the group consisting of sulfonium, iodonium, diazonium and azinium.

5. A polymerizable composition according to claim 1 , wherein the amount of the component (B) in the polymerizable composition is in a range of 0.5 to 50% by mass as a solid.

6. A polymerizable composition according to claim 1 , further comprising (C) a compound having a maximum absorption wavelength at 700 to 1200 nm.

7. A polymerizable composition according to claim 1 , further comprising (C) a compound having a maximum absorption wavelength at 700 to 1200 nm which is an infrared absorbing dye or pigment.

8. A polymerizable composition according to claim 2 , further comprising (C) a compound having a maximum absorption wavelength at 700 to 1200 nm.

9. A polymerizable composition according to claim 3 , further comprising (C) a compound having a maximum absorption wavelength at 700 to 1200 nm.

10. A polymerizable composition according to claim 4 , further comprising (C) a compound having a maximum absorption wavelength at 700 to 1200 nm.

11. A polymerizable composition according to claim 5 , further comprising (C) a compound having a maximum absorption wavelength at 700 to 1200 nm.

12. A planographic printing plate precursor comprising:

a support; and

a recording layer disposed on the support,

wherein the recording layer includes the polymerizable composition of claim 1 .

13. A planographic printing plate precursor comprising:

a support; and

a recording layer disposed on the support,

wherein the recording layer includes the polymerizable composition of claim 2 .

14. A planographic printing plate precursor comprising:

a support; and

a recording layer disposed on the support,

wherein the recording layer includes the polymerizable composition of claim 3 .

15. A planographic printing plate precursor comprising:

a support; and

a recording layer disposed on the support,

wherein the recording layer includes the polymerizable composition of claim 4 .

16. A planographic printing plate precursor comprising:

a support; and

a recording layer disposed on the support,

wherein the recording layer includes the polymerizable composition of claim 5 .

17. A planographic printing plate precursor comprising:

a support; and

a recording layer disposed on the support,

wherein the recording layer includes the polymerizable composition of claim 6 .

18. A planographic printing plate precursor comprising:

a support; and

a recording layer disposed on the support,

wherein the recording layer includes the polymerizable composition of claim 8 .

19. A planographic printing plate precursor comprising:

a support; and

a recording layer disposed on the support,

wherein the recording layer includes the polymerizable composition of claim 9 .

20. A planographic printing plate precursor comprising:

a support; and

a recording layer disposed on the support,

wherein the recording layer includes the polymerizable composition of claim 10 .

21. A planographic printing plate precursor comprising:

a support; and

a recording layer disposed on the support,

wherein the recording layer includes the polymerizable composition of claim 11 .

22. A planographic printing plate precursor comprising:

a support; and

a recording layer disposed on the support;

wherein the recording layer includes a polymerizable composition comprising:

(A) a compound including a polymerizable unsaturated group; and

(B) a macromolecular compound including, at a side chain thereof, a structure represented by the following general formula (II)

wherein X represents a hydrogen atom, a monovalent organic group, a hydroxyl group, a urethane group, a urea group, a halogen atom, an amino group, an amide group, a sulfonyl group or a sulfonate group, Y represents a divalent organic connecting group n denotes 0 or 1, Z − represents COCOO − , COO − , SO 3 − or SO 2 —N − —R where R represents a monovalent organic group and M + represents an onium cation.

23. A planographic printing plate precursor according to claim 22 , wherein the polymerizable composition further comprises (C) a compound having a maximum absorption wavelength at 700 to 1200 nm.