Negative type resist composition for color filter, color filter using same, and liquid crystal display

1. A negative resist composition for a color filter, comprising (A) a pigment dispersant, (B) a pigment, (C) an alkaline-soluble resin, (D) a polyfunctional monomer, (E) a photo initiator and (F) a solvent,

wherein the pigment dispersant (A) is a block copolymer comprising a constituting unit ( 1 ) represented by the following general formula (I) and a constituting unit ( 2 ) represented by the following general formula (II), and

further wherein an amino group possessed by the constituting unit ( 1 ) and an acidic organic phosphorus compound represented by the general formula (III) react and form a salt,

in the above formulae (I) to (III), R 1 is a hydrogen atom or a methyl group; R 2 and R 3 each and independently denote a hydrogen atom or a C1 to C8 alkyl group; A is a C1 to C8 alkylene group or a divalent group represented by —[CH(R 6 )—CH(R 7 )—O)] x —CH(R 6 )—CH(R 7 )— or [(CH 2 ) y —O] z —(CH 2 ) y —; R 4 is a C1 to C18 alkyl group, a benzyl group, a phenyl group, a biphenyl group, —[CH(R 6 )—CH(R 7 )—O] x —R 8 or —[(CH 2 ) y —O] z —R 8 ; R 5 , R 5 ′ each and independently denote a hydrogen atom, a hydroxyl group, a C1 to C18 alkyl group, a C2 to C18 alkenyl group, a benzyl group, a phenyl group, a biphenyl group or a monovalent group represented by —[CH(R 9 )—CH(R 10 )—O] a —R 11 or —[(CH 2 ) b —O] c —R 11 or —O—R 5 ″;

R 5 ″ is a C1 to C18 alkyl group, a C2 to C18 alkenyl group, a benzyl group, a phenyl group, a biphenyl group or a monovalent group represented by —[CH(R 9 )—CH(R 10 )—O] a —R 11 or —[(CH 2 ) b —O] c —R 11 ;

R 6 , R 7 , R 9 and R 10 each and independently denote a hydrogen atom or a methyl group; R 8 and R 11 each and independently denote a hydrogen atom, a C1 to C18 alkyl group, a benzyl group, a phenyl group, a biphenyl group or a monovalent group represented by —CHO, —CH 2 CHO, —CO—CH═CH 2 , —CO—C(CH 3 )═CH 2 or —CH 2 COOR 12 , provided that each group of R 8 and R 11 may have a substituent group; R 12 is a hydrogen atom or a C1 to C5 alkyl group;

“x” and “a” denote integers of 0 to 18, “y” and “b” denote integers of 1 to 5, “z” and “c” denote integers of 0 to 18, and “m” and “n” denote integers of 1 to 200, wherein a content of the acidic organic phosphorus compound is within the range of 0.05 molar equivalent to 4.0 molar equivalents relative to the amino group contained in the constituting unit ( 1 ).

2. The negative resist composition for a color filter according to claim 1 , wherein the respective R 5 and R 5 ′ in the acidic organic phosphorus compound has a polymerizable group.

3. The negative resist composition for a color filter according to claim 2 , wherein the polymerizable group is a vinyl group, a (metha)acryloyl group or an allyl group.

4. The negative resist composition for a color filter according to claim 2 , wherein an average particle diameter of the pigment (B) is in a range of 10 nm to 100 nm.

5. A color filter comprising a color layer formed by using the negative resist composition for a color filter according to claim 2 .

6. A liquid crystal display comprising the color filter according to claim 5 .

7. The negative resist composition for a color filter according to claim 1 , wherein an average particle diameter of the pigment (B) is in a range of 10 nm to 100 nm.

8. A color filter comprising a color layer formed by using the negative resist composition for a color filter according to claim 7 .

9. A liquid crystal display comprising the color filter according to claim 8 .

10. A color fitter comprising a color layer formed by using the negative resist composition for a color filter according to claim 1 .

11. A liquid crystal display comprising the color filter according to claim 10 .

12. The negative resist composition for a color filter according to claim 1 , wherein either of R 5 , R 5 ′ of the acidic organic phosphorus compound denotes a C1 to C18 alkyl group, and C2 to C18 alkenyl group, a benzyl group, a phenyl group, a biphenyl group or a monovalent group represented by —[CH(R 9 )—CH(R 10 )—O] a —R 11 or —[(CH 2 ) b —O] c —R 11 or —O—R 5 ″.

13. The negative resist composition for a color filter according to claim 12 , wherein either of R 5 , R 5 ′ of the acidic organic phosphorus compound contains an aromatic ring.

14. The negative resist composition for a color filter according to claim 13 , wherein either of R 5 , R 5 ′ of the acidic organic phosphorus compound is a phenyl group.

15. The negative resist composition for a color filter according to claim 14 , wherein the acidic organic phosphorus compound is a phenylphosphonic acid.