Negative type photosensitive composition comprising black colorant
[Problem] To provide a negative type photosensitive composition which is capable of forming a cured film having high resolution and high light shielding properties. [Means for Solution] A negative type photosensitive composition comprising (I) an alkali-soluble resin, (II) a black colorant, (III) a polymerization initiator, and (IV) a solvent, wherein the black colorant (II) has a transmittance ratio represented by [transmittance at the wavelength of 365 nm]/[transmittance at the wavelength of 500 nm] of 1.2 more.
1. A negative type photosensitive composition comprising (I) a polysiloxane comprising a repeating unit represented by the formula (Ia′):
wherein,
R a1′ is hydrogen or methyl; and
ma′ is each independently an integer of 1 to 6,
(II) a black colorant,
(III) a polymerization initiator, and
(IV) a solvent,
wherein the black colorant (II) has a transmittance ratio represented by [transmittance at the wavelength of 365 nm]/[transmittance at the wavelength of 500 nm] of 1.2 or more.
2. The composition according to claim 1 , wherein the polysiloxane comprises a repeating unit represented by the formula (Ia):
wherein,
R a1 is hydrogen or methyl; and
ma is each independently an integer of 1 to 6, and
an acrylic polymerization unit represented by the formula (a):
wherein,
R a2 is each independently hydrogen or methyl;
R a3 is hydrogen, a monovalent to hexavalent, C 1-50 hydrocarbon group, wherein one or more methylene in the hydrocarbon group can be replaced by oxy, imino and/or carbonyl, and when R a3 is multivalent, R a3 connects carbonyloxy in the formula (a) with carbonyloxy contained in another repeating unit represented by the formula (a); and
na is an integer of 0 or more, and
wherein,
* of at least one repeating unit in the formula (Ia) is connected, directly or via an acrylic polymerization unit represented by the formula (a), to * of another repeating unit represented by the formula (Ia).
3. The composition according to claim 1 , wherein the content of the black colorant is 3 to 80 mass % based on the total mass of the alkali-soluble resin.
4. The composition according to claim 1 , further comprising a compound containing two or more (meth)acryloyloxy groups (V).
5. The composition according to claim 1 , wherein the content of the compound containing two or more (meth)acryloyloxy groups (V) is 5 to 1,000 mass based on the total mass of the alkali-soluble resin (I).
6. The composition according to claim 1 , further comprising a saccharide (VI).
7. A method for producing a cured film comprising applying the composition according to claim 1 onto a substrate to form a coating film, exposing the coating film, and developing.
8. A cured film produced by the method according to claim 7 .
9. The cured film according to claim 8 , wherein the average film thickness is 5 to 100 μm.
10. The cured film according to claim 8 , wherein the optical density (OD) is 2 or more.
11. A display device comprising the cured film according to claim 8 .