Black curable composition, light-shielding color filter for a solid-state imaging device and method of producing the same, solid-state imaging device, wafer level lens, and camera module
A black curable composition for forming a light-shielding color filter of solid-state imaging device is provided, which is capable of forming a pattern at low exposure dose even when containing a high concentration of an inorganic pigment, and preventing pattern defects. Also, a black curable composition for a wafer level lens is provided, which is capable of forming a cured film having excellent light shieldability and excellent in co-formability of both a large pattern and a fine pattern. The composition includes: an inorganic pigment; a copolymer containing a monomer having at least one of an amino group and a nitrogen-containing heterocyclic group, a monomer having at least one group of a carboxyl group, a phosphate group and a sulfonate group, and a macromonomer having a weight average molecular weight from 1,000 to 50,000; a polymerization initiator; a polymerizable compound; and an alkali-soluble resin having an unsaturated double bond.
1. A black curable composition for a solid-state imaging device, comprising:
(A) an inorganic pigment;
(B) a copolymer comprising (b−1) a monomer having at least one group selected from an amino group and a nitrogen-containing heterocyclic group, (b-2) a monomer comprising at least acrylic acid or methacrylic acid and (b-3) a macromonomer having a weight average molecular weight from 1,000 to 50,000;
(C) a polymerization initiator;
(D) a polymerizable compound; and
(E) an alkali-soluble resin having an unsaturated double bond,
wherein a mass ratio of the (E) alkali-soluble resin to the (D) polymerizable compound is from 0.3 to 2.5.
2. The black curable composition according to claim 1 , wherein the (A) inorganic pigment comprises titanium black.
3. The black curable composition according to claim 2 , wherein the titanium black has an average primary particle diameter of from 30 nm to 65 nm.
4. The black curable composition according to claim 1 , wherein a mass ratio of the (B) copolymer to the (A) inorganic pigment is from 0.15 to 0.35.
5. The black curable composition according to claim 1 , wherein the (C) polymerization initiator comprises an oxime ester compound or a hexaarylbiimidazole compound.
6. The black curable composition according to claim 1 , further comprising an (F) organic pigment.
7. A method of producing a light-shielding color filter for a solid-state imaging device, the method comprising:
applying the black curable composition for a solid-state imaging device according to claim 1 onto a support;
subjecting a black curable composition layer formed by the applying to pattern light exposure; and
developing the black curable composition layer after the exposure to form a light-shielding pattern, in this order.
8. A light-shielding color filter for a solid-state imaging device, which is formed using the black curable composition for a solid-state imaging device according to claim 1 .
9. A solid-state imaging device, comprising the light-shielding color filter for a solid-state imaging device according to claim 8 .
10. The black curable composition according to claim 1 , wherein the (b-3) macromonomer is a polyester macromonomer represented by the following formula (M):
wherein in Formula (M), R 1A represents a hydrogen atom or a methyl group; R 2A represents an alkylene group; R 3A represents a linear alkyl group having 5 to 20 carbon atoms; n represents an integer of 5 to 100; and plural R 2A 's may be the same as or different from each other.
11. A black curable composition for a wafer level lens, comprising:
(A) an inorganic pigment;
(B) a copolymer comprising (b−1) a monomer having at least one group selected from an amino group and a nitrogen-containing heterocyclic group, (b-2) a monomer comprising at least acrylic acid or methacrylic acid and (b-3) a macromonomer having a weight average molecular weight from 1,000 to 50,000;
(C) a polymerization initiator;
(D) a polymerizable compound; and
(E) an alkali-soluble resin having an unsaturated double bond,
wherein a mass ratio of the (E) alkali-soluble resin to the (D) polymerizable compound is from 0.3 to 2.5.
12. The black curable composition according to claim 11 , wherein the (A) inorganic pigment comprises titanium black.
13. The black curable composition according to claim 12 , wherein the titanium black has an average primary particle diameter of from 30 nm to 65 nm.
14. The black curable composition according to claim 11 , wherein a mass ratio of the (B) copolymer to the (A) inorganic pigment is from 0.15 to 0.35.
15. The black curable composition according to claim 11 , wherein the (C) polymerization initiator comprises an oxime ester compound or a hexaarylbiimidazole compound.
16. The black curable composition according to claim 11 , further comprising an (F) organic pigment.
17. A wafer level lens, comprising a light-shielding film formed using the black curable composition according to claim 11 , wherein the light-shielding film is formed around a lens arranged on a substrate of the wafer level lens.
18. A camera module, comprising the wafer level lens according to claim 17 .
19. The black curable composition according to claim 11 , wherein the (b-3) macromonomer is a polyester macromonomer represented by the following formula (M):
wherein in Formula (M), R 1A represents a hydrogen atom or a methyl group; R 2A represents an alkylene group; R 3A represents a linear alkyl group having 5 to 20 carbon atoms; n represents an integer of 5 to 100; and plural R 2A 's may be the same as or different from each other.