Photosensitive composition, color filter and method for forming the color filter
A photosensitive composition, a color filter prepared by using the photosensitive composition and a method for preparing the color filter. The photosensitive composition includes an alkali-soluble resin (A); an ethylenically unsaturated monomer (B); a photopolymerization initiator (C); a solvent (D); and a colorant (E), wherein the content of the photopolymerization initiator (C) is from 32 parts by weight to 70 parts by weight based on 100 parts by weight of the ethylenically unsaturated monomer(B).
1. A color photosensitive composition, comprising:
an alkali-soluble resin (A);
an ethylenically unsaturated monomer (B);
an oxime ester-based photopolymerization initiator (C);
a solvent (D); and
a colorant (E),
wherein the content of the alkali-soluble resin (A) is from 100 parts by weight to 200 parts by weight based on 100 parts by weight of the ethylenically unsaturated monomer (B),
wherein the content of the oxime ester-based photopolymerization initiator (C) is from 32 parts by weight to 70 parts by weight based on 100 parts by weight of the ethylenically unsaturated monomer (B),
wherein the content of the solvent (D) is from 1649 parts by weight to 2402 parts by weight based on 100 parts by weight of the ethylenically unsaturated monomer (B),
wherein the colorant (E) is from 30 parts by weight to 300 parts by weight based on 100 parts by weight of the ethylenically unsaturated monomer (B),
wherein the alkali-soluble resin (A) is formed with monomers, wherein based on total moles of the monomers forming the alkali-soluble resin (A), the monomers comprise:
15 mol % to 35 mol % of a monomer represented by the formula (1):
wherein R 1 to R 4 are each independently hydrogen, methyl group or ethyl group;
20 mol % to 30 mol % of unsaturated carboxylic acid or unsaturated carboxylic anhydride; and
40 mol % to 60 mol % of one or more monomers selected from the group consisting of an acrylic compound, a styrene-based compound, and a maleimide-based compound,
the oxime ester-based photopolymerization initiator (C) comprises at least a compound represented by formula (2) and at least a compound represented by formula (3) in a weight ratio of 4:1 to 1:1,
wherein R 5 and R 6 are each independently hydrogen, C1-C20 alkyl group, C3-C8 cycloalkyl group, C2-C5 alkenyl group, substituted or unsubstituted C6-C20 aryl, or C7-C20 heteroaryl group,
wherein R 7 is substituted or unsubstituted C6-C20 aryl group, or C7-C20 heteroaryl group,
R 8 is C1-C20 alkyl group, C2-C5 alkenyl group, C3-C10 cycloalkyl group, phenyl, or benzyl group, and
R 9 and R 10 are each independently C1-C20 alkyl group, C3-C8 cycloalkyl group, C2-C5 alkenyl group, substituted or unsubstituted C6-C20 aryl group, or C7-C20 heteroaryl group,
wherein the color photosensitive composition does not comprise C.I. Pigment Black 1, C.I. Pigment Black 7, titanium black, synthetic iron black, and carbon black, and
the color photosensitive composition has a total residual film difference k between 0 and 1.0%, the total residual film difference k is calculated according to the following equation:
k
=
(
film
thickness
of
150
mJ
/
cm
2
)
-
(
film
thickness
of
40
mJ
/
cm
2
)
film
thickness
of
150
mL
/
cm
2
×
100
%
the film thickness of 150 mJ/cm 2 and the film thickness of 40 mJ/cm 2 are a thickness of a film obtained by UV-irradiating the color photosensitive composition under 150 mJ/cm 2 and 40 mJ/cm 2 , respectively.
2. The color photosensitive composition of claim 1 , wherein the colorant (E) comprises an organic pigment, an inorganic pigment or a combination thereof.
3. The color photosensitive composition of claim 2 , wherein the organic pigment comprises diketopyrrolopyrrole-type pigment, anthraquinone-type pigment, dianthraquinone-type pigment, phthalocyanine-type pigment, benzimidazolone-type pigment, dioxazine-type pigment, azo-type pigment, thiazinium blue-type pigment, quinacridone-type pigment or a combination thereof.
4. The color photosensitive composition of claim 1 , wherein the solvent (D) comprises a mixture of propylene glycol methyl ether acetate and a high boiling point solvent having a boiling point more than 145° C.
5. The color photosensitive composition of claim 4 , wherein a weight ratio of the propylene glycol methyl ether acetate to the high boiling points solvent is 7:1 to 2:1.
6. The color photosensitive composition of claim 4 , wherein the high boiling point solvent comprises ethyl 3-ethoxypropionate (EEP), ethyl pyruvate (PE), ethyl lactate, butyl lactate, benzyl alcohol, 3-methoxybutyl acetate (MBA), 3-methoxy 3-methylbutanol, γ-butyrolactone, or propylene glycol monobutyl ether.
7. A method of forming a color filter, comprising:
coating the color photosensitive composition of claim 1 on a surface of a substrate.
8. A color filter, comprising:
a colored layer formed by curing the color photosensitive composition of claim 1 .