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

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), R1 is a hydrogen atom or a methyl group;
• R2 and R3 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(R6)—CH(R7)—O)]x—CH(R6)—CH(R7)— or [(CH2)y—O]z—(CH2)y—;
• R4 is a C1 to C18 alkyl group, a benzyl group, a phenyl group, a biphenyl group, —[CH(R6)—CH(R7)—O]x—R8 or —[(CH2)y—O]z—R8;
• R5, R5′ 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(R9)—CH(R10)—O]a—R11 or —[(CH2)b—O]c—R11 or —O—R5″;
• R5″ 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(R9)—CH(R10)—O]a—R11 or —[(CH2)b—O]c—R11;
• R6, R7, R9 and R10 each and independently denote a hydrogen atom or a methyl group;
• R8 and R11 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, —CH2CHO, —CO—CH═CH2, —CO—C(CH3)═CH2 or —CH2COOR12, provided that each group of R8 and R11 may have a substituent group;
• R12 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).