Photosensitive composition, color filter and method for forming the color filter

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 R1 to R4 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 R5 and R6 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 R7 is substituted or unsubstituted C6-C20 aryl group, or C7-C20 heteroaryl group,
• R8 is C1-C20 alkyl group, C2-C5 alkenyl group, C3-C10 cycloalkyl group, phenyl, or benzyl group, and
• R9 and R10 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/cm2 and the film thickness of 40 mJ/cm2 are a thickness of a film obtained by UV-irradiating the color photosensitive composition under 150 mJ/cm2 and 40 mJ/cm2, respectively.