Process for making green pigment compositions useful for color filters and LCD's
AssigneeCiba Specialty Chemicals Corporation
InventorsVéronique Hall-Goulle, Takashi Deno
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Abstract
The invention pertains to the field of green color filters and LCDs. It has been found that pigments with surprisingly improved coloristic, chemical and physical properties are obtained by salt-kneading a halogenated phthalocyanine pigment together with a yellow pigment of the disazo condensation, barbituric acid or azoquinolone series. The process takes place in the presence of an organic liquid and in the absence of binder or optionally in the presence of a relatively small amount of binder. Claimed are the process itself as well as the green pigment composition obtained by the process and compositions comprising it.
Claims12
A process for manufacturing a colorant composition in pigmentary form, comprising subjecting to a shearing force sufficient to break any colourant particles to a size less than 0.2 μm at −20 to 180° C. a mixture comprising:
- i) a phthalocyanine of formula
- wherein M1 is H2,Cu, Zn, Fe, Ni, Pd, VO, MnO or TiO and X1 to X16 are H, Br or Cl, at least one of X1 to X16 being Cl;
- or a mixture thereof;
- ii) a compound or mixture of compounds selected from those of formulae (II), (III), (IV) and (V) and tautomers thereof,
- wherein m is 0 or 1, n is 1 or 2,
- B2 and B3 are independently from each other CN, CONR6R7 or CONR6Ar1,
- R1 and R2 are independently from each other Cl, R6 or OR6,
- R3, R4 and R5 are independently from each other H, F, Cl, R6, CF3, OR6, CONR6R7, CONR6Ar1, SO2NR6R7 or SO2NR6Ar1, and
- R6 and R7 are H, C1–C8alkyl or C5–C8cycloalkyl,
- Ar1 is phenyl, benzyl, biphenyl, naphthyl, phenoxyphenyl, phenyithiophenyl or carbazolyl which is unsubstituted or substituted by 1 to 5 substituents selected independently from the group consisting of F, Br, Cl, R6, CF3, OR6, COOR6R7 and CONR6Ar3,
- Ar2 is phenyl, benzyl, biphenyl, naphthyl, phenoxyphenyl, phenylthiophenyl or carbazolyl when n is 1, respectively phenylen, biphenylen, naphthylen, oxydiphenyl, thiodiphenyl or carbazolylen when n is 2, each of which is unsubstituted or substituted by 1 to 5 substituents selected independently from the group consisting of F, Br, Cl, R6, CF3, OR6, COOR6, CN, CONR6R7, CONR6Ar3, NR6COR7, NR6COAr3, NR6SO2R7, NR6SO2Ar3, NO2, SO2NR6Ar3, SO3M2 and COOM2, wherein M2 is H, Na, Li, K, Ca1/2, Sr1/2, Ba1/2, Mg1/2 or a negative charge neutralised by NH4+to or primary, secondary, tertiary or quaternary ammonium,
- and Ar3 is phenyl, benzyl, biphenyl, naphthyl, phenoxyphenyl, phenyithiophenyl or carbazolyl which is unsubstituted or substituted by 1 to 5 substituents selected independently from the group consisting of F, Br, Cl, R6, CF3, OR6 and NO2;
- iii) a grinding auxiliary soluble in water to the extent of at least 10 g/100 ml and selected from the group consisting of organic salts, organic compounds, crystalline inorganic salts, and mixtures thereof;
- and
- iv) an organic liquid in which the grinding auxilary is soluble to the extent of less than or equal to 100 miligrams per liter at 20° C.
Dependencies are inferred from the claim text.