Colored photosensitive resin composition and light shielding spacer prepared therefrom
The present invention relates to a colored photosensitive resin composition and to a light shielding spacer prepared therefrom. The colored photosensitive resin composition comprises an oxime ester fluorene-based compound as a photopolymerization initiator in a small amount, which is capable of forming a cured film that is excellent in terms of such properties as sensitivity, elastic recovery rate, resolution, chemical resistance, exudation resistance, voltage holding ratio, and the like. Accordingly, a light shielding spacer prepared therefrom can be advantageously used for a liquid crystal display, an organic EL display, and the like.
1. A colored photosensitive resin composition, which comprises:
(A) 5 to 40 wt % of a copolymer comprising (A-1) structural unit derived from an ethylenically unsaturated carboxylic acid, an ethylenically unsaturated carboxylic anhydride, or a combination thereof, (A-2) structural unit derived from an ethylenically unsaturated compound containing an aromatic ring, and (A-3) structural unit derived from an ethylenically unsaturated compound different from (A-1) and (A-2), based on the total weight of the solid content of the colored photosensitive resin composition;
(B) 5 to 30 wt % of an epoxy resin or a compound derived therefrom, based on the total weight of the solid content of the colored photosensitive resin composition;
(C) 10 to 40 wt % of a photopolymerizable compound, based on the total weight of the solid content of the colored photosensitive resin composition;
(D) 0.05 to 5 wt % of a photopolymerization initiator, based on the total weight of the solid content of the colored photosensitive resin composition; and
(E) 10 to 75 wt % of a colorant, based on the total weight of the solid content of the colored photosensitive resin composition,
wherein the photopolymerization initiator (D) comprises an oxime ester fluorene-based initiator of Formula 1 below:
wherein, in Formula 1 above, R1 is each independently C1-20 alkyl, R2 and R3 are each independently C1-20 alkyl, C6-20 aryl, or C3-20 cycloalkyl,
A is nitro or cyano, and
X is a single bond or carbonyl.
2. The colored photosensitive resin composition according to claim 1 , wherein R1 is each independently methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, t-butyl, n-pentyl, i-pentyl, n-hexyl, or i-hexyl,
R2 and R3 are each independently methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, t-butyl, n-pentyl, i-pentyl, n-hexyl, i-hexyl, phenyl, naphthyl, biphenyl, terphenyl, anthryl, indenyl, or phenanthryl.
3. The colored photosensitive resin composition according to claim 1 , wherein the epoxy resin or the compound derived therefrom (B) has a cardo backbone structure.
4. The colored photosensitive resin composition according to claim 1 , wherein the colorant is at least one selected from the group consisting of a black inorganic colorant, a black organic colorant, and a blue colorant.
5. The colored photosensitive resin composition according to claim 1 , wherein the colorant comprises the black inorganic colorant in an amount of 0 to 20 wt %, the black organic colorant in an amount of 10 to 40 wt %, and the blue colorant in an amount of 0 to 15 wt % based on the total weight of the solid content of the colored photosensitive resin composition.
6. A light shielding spacer manufactured from the colored photosensitive resin composition according to claim 1 .
7. The light shielding spacer according to claim 6 , which has a voltage holding ratio of 85% or more.
8. The light shielding spacer according to claim 6 , which has an optical density of 0.5 to 1.5/μm.
9. The light shielding spacer according to claim 6 , which has an elastic recovery rate of 90% or more.