Photosensitive composition, partition walls and black matrix

1. A photosensitive composition, which comprises a polymer (A) having a side chain containing a group represented by the following formula (1) or a group represented by the following formula (2) and a side chain containing an ethylenic double bond in one molecule, a black colorant (B), a photopolymerization initiator (C) which is a compound represented by the following formula (3), and a photosensitive resin (D) containing an acidic group and an ethylenic double bond in one molecule, wherein the proportion of the black colorant (B) in the total solid content of the composition is from 15 to 60 mass %:

—CFXR f   formula (1)

wherein X is a hydrogen atom, a fluorine atom or a trifluoromethyl group, and R f is an alkyl group having at most 20 carbon atoms which may have an etheric oxygen atom, at least one of hydrogen atoms of which is substituted by a fluorine atom, or a fluorine atom;

—(SiR 1 R 2 O) n —SiR 1 R 2 R 3   formula (2)

wherein each of R 1 and R 2 which are independent of each other, is a hydrogen atom, an alkyl group, a cycloalkyl group or an aryl group, R 3 is a hydrogen atom or a C 1-10 organic group, and n is an integer of from 1 to 200;

wherein R 1 is a hydrogen atom, a C 1-12 alkyl group, a C 3-8 cycloalkyl group, a C 2-5 alkenyl group, a C 6-20 phenyl group or a C 6-20 phenoxy group of which a hydrogen atom in the benzene ring may be substituted by an alkyl group;

R 2 is a hydrogen atom, a C 1-20 alkyl group, a C 3-8 cycloalkyl group, a C 6-20 phenyl group of which a hydrogen atom in the benzene ring may be substituted by an alkyl group, a C 2-20 alkanoyl group, a C 7-20 benzoyl group of which a hydrogen atom in the benzene ring may be substituted by an alkyl group, a C 2-12 alkoxycarbonyl group, or a C 7-20 phenoxycarbonyl group of which a hydrogen atom in the benzene ring may be substituted by an alkyl group;

R 3 is a C 1-12 alkyl group; and

each of R 4 , R 5 , R 6 and R 7 which are independent of one another, is a hydrogen atom, a C 1-12 alkyl group, a C 3-8 cycloalkyl group of which a hydrogen atom in the cyclohexane ring may be substituted by an alkyl group, a C 6-20 phenyl group of which a hydrogen atom in the benzene ring may be substituted by an alkyl group, a C 2-20 alkanoyl group, a C 7-20 benzoyl group of which a hydrogen atom in the benzene ring may be substituted by an alkyl group, a C 7-20 benzylcarbonyl group of which a hydrogen atom in the benzene ring may be substituted by an alkyl group, a C 2-12 alkoxycarbonyl group, a C 7-20 phenoxycarbonyl group of which a hydrogen atom in the benzene ring may be substituted by an alkyl group, a C 1-20 amide group or a nitro group.

2. The photosensitive composition according to claim 1 , wherein the polymer (A) has a side chain containing at least two ethylenic double bonds per one side chain.

3. The photosensitive composition according to claim 1 , wherein the polymer (A) further has a side chain containing an acidic group.

4. The photosensitive composition according to claim 3 , wherein the acid value of the polymer (A) is at most 100 (mgKOH/g).

5. The photosensitive composition according to claim 1 , wherein the amount of the ethylenic double bonds in the polymer (A) is from 1.0×10 −3 to 5.0×10 −3 mol/g.

6. The photosensitive composition according to claim 1 , wherein the black colorant (B) is carbon black.

7. The photosensitive composition according to claim 1 , wherein the proportion of the photopolymerization initiator (C) in the total solid content of the photosensitive composition is from 1 to 10 mass %.

8. The photosensitive composition according to claim 1 , which further contains a radical crosslinking agent (E) containing at least two ethylenic double bonds and containing no acidic group.

9. Partition walls having a cured product of the photosensitive composition as defined in claim 1 .

10. The partition walls according to claim 9 , wherein of the cured product, the contact angle to water is at least 90°, and the contact angle to PGMEA is at least 20°.

11. A black matrix comprising the partition walls as defined in claim 9 .

12. A color filter, which comprises a substrate, a plurality of pixels on the substrate, and partition walls located among the adjacent pixels, wherein the partition walls are made of a cured product of the photosensitive composition as defined in claim 1 .

13. An organic EL device, which comprises a substrate, a plurality of pixels on the substrate, and partition walls located among the adjacent pixels, wherein the partition walls are made of a cured product of the photosensitive composition as defined in claim 1 .