JP2008308605A5 - - Google Patents

Description

Although the usage-amount of the said water-soluble organic solvent is not specifically limited, 0.01-5 weight part is preferable with respect to 1 weight part of crude pigments.
The kneading temperature is preferably 80 to 120 ° C. Whether kneaded at a temperature below 80 ° C. or kneaded at a temperature exceeding 120 ° C., the ε-type copper phthalocyanine has a low ε conversion rate (ε-type crystallization rate contained in copper phthalocyanine), heat resistance, and contrast Etc. are reduced, which is not preferable as a color filter pigment.
The pigment for a color filter of the present invention may contain free copper. The contained free copper may be free copper remaining when copper phthalocyanine is synthesized or may be produced by decomposition of copper phthalocyanine after synthesis.
Free copper can be washed with acids described later . The acids used are 0.5% to 4% hydrochloric acid or sulfuric acid. In addition, the temperature at the time of cleaning, 50~90 ℃ is not preferred.
Content of good Masui free copper, if it is 900 mass ppm or less in the pigment composition can be mentioned, in the case any more content, the heat resistance of the resulting color filter is undesirably reduced.

Claims (9)

In the method for producing a color filter pigment composition,
(I) (A) ε-type phthalocyanine pigment, and (B) General formula (1) having a content of 4 to 15% by mass in the pigment mixture

(Wherein, X represents a metal atom or a metal oxide, Y represents a phthalimidomethyl group, and n ₁ , n ₂ , n ₃ , and n ₄ represent the number of substituents Y, each independently. (At least one is an integer from 0 to 4 that is not 0, and n ₁ + n ₂ + n ₃ + n ₄ = 1 to _4. )
A phthalocyanine derivative represented by
The kneaded product of a pigment mixture, a water-soluble inorganic salt and pigment mixture obtained in the step of kneading at 80 to 120 ° C. in the presence of an organic solvent (II) wherein (I) containing a concentration 0.5 on a mass basis A method for producing a pigment composition for a color filter, comprising a step of washing with -4% hydrochloric acid or sulfuric acid . The ε-type phthalocyanine is one or more ε-type phthalocyanines selected from the group consisting of ε-type copper phthalocyanine, ε-type zinc phthalocyanine, ε-type cobalt phthalocyanine, ε-type nickel phthalocyanine, and ε-type iron phthalocyanine. A method for producing a color filter pigment composition. The method for producing a pigment composition for a color filter according to claim 1 or 2, wherein X in the general formula (1) is copper, zinc, cobalt, nickel, iron, titanium oxide, or vanadium oxide. In the general formula (1) _{in, n 1 + n 2 + n} 3 + n 4 = 1~2 method of manufacturing a color filter pigment composition according to any one of claims 1 to 3. The method for producing a pigment composition for a color filter according to any one of claims 1 to 4, wherein the water-soluble inorganic salt is sodium chloride or sodium sulfate. The method for producing a pigment composition for a color filter according to any one of claims 1 to 5, wherein the organic solvent is a polyhydric alcohol. The method for producing a pigment composition for a color filter according to claim 6, wherein the polyhydric alcohol is ethylene glycol or diethylene glycol. Color filter pigment dispersion obtained by blending a pigment composition for a color obtained filter by the method according to any one of claims 1 to 7. The color filter which uses the pigment dispersion for color filters of Claim 8 for a blue pixel part.