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Pigment dispersing composition

A pigment dispersion and composition technology, applied in pigment paste, organic dyes, chemical/physical processes, etc., can solve the problems of lower contrast of liquid crystal display devices, difficulty in combining pigment particles, and lower light transmittance

Active Publication Date: 2008-03-19
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of pigments as colorants, if the micronization of the pigments is insufficient, light is scattered and absorbed by the pigment particles, and the light transmittance decreases.
In addition, there is a problem that the polarization axis is rotated due to light scattering, birefringence, etc. caused by the pigment particles, and the contrast of the liquid crystal display device is also reduced, so that the pigment particles are required to be finer.
However, even if these polymer dispersants are used, it is difficult to achieve both sufficient fluidity to solve the above-mentioned problems and dispersion of finer pigment particles.

Method used

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Examples

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preparation example Construction

[0161]

[0162] The preparation method of the pigment dispersion composition of the present invention is not particularly limited, for example, it can be obtained by the following method: using a pigment and a pigment dispersant and a solvent, utilizing a vertical or horizontal sand mill, pin mill, slot mill (slit mill), ultrasonic disperser, etc., obtained by microdispersing beads made of glass, zirconia, etc. with a particle size of 0.01 to 1 mm.

[0163] In addition, before the beads are dispersed, it is also possible to use a two-roller, three-roller, ball mill, drum mill (Tron Mill), disperser, kneader, co-kneader (Konider), homogenizer, mixer, single A screw or twin-screw extruder or the like performs kneading and dispersing treatment while applying a strong shearing force.

[0164] In addition, the details of kneading and dispersion are described in "Paint Flow and Pigment Dispersion" by T.C. Patton (1964 publication of John Wiley and Sons Company) and the like.

[0...

Embodiment 1

[0169]

[0170] The components of the following composition (1) were mixed, stirred and mixed for 3 hours using a homogenizer at a rotation speed of 3000 r.p.m. to prepare a mixed solution containing a pigment.

[0171] [composition (1)]

[0172] · C.I. Pigment Red 254 [(a) Pigment] 90 parts

[0173] · C.I. Pigment Red 177 [(a) Pigment] 10 parts

[0174] ・Cyclohexyl methacrylate / benzyl methacrylate / methacrylic acid copolymer (=45 / 40 / 15 [weight ratio], weight average molecular weight 20000, acid value 100) (polymer 1: (d) disperse 30 parts of 30% solution of acetic acid 1-methoxy-2-propyl ester solvent

[0175] Solspers 24000GR (manufactured by Lubrizol Japan; (polyester-based dispersant) [(c) dispersant] 40 parts

[0176] 820 parts of 1-methoxy-2-propyl acetate [(b) solvent]

[0177] Next, the mixed solution obtained above was subjected to a dispersion treatment for 6 hours in a bead disperser Disper-Matt (manufactured by GETZMANN) using 0.1 mmφ zirconia beads, and then ...

Embodiment 2

[0185] In addition to replacing 30 parts of 30% solution of 1-methoxyl-2-propyl acetate solvent as (d) dispersant in Example 1 with cyclohexyl methacrylate / methacrylic acid Butyl ester / methacrylic acid copolymer (=45 / 44 / 11 [weight ratio], weight average molecular weight 20000, acid value 71) (polymer 2: (d) dispersant) of acetic acid 1-methoxyl-2 Except for 30 parts of the 30% solution of the propyl ester solvent, a red pigment dispersion composition was prepared in the same manner as in Example 1, and the same evaluation as in Example 1 was performed. The results are shown in Table 1 below.

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Abstract

The invention provides a pigment dispersion constituent, which can prevent the pigment particles from agglomerating in the present of minute pigment particles, with noncrystalline and excellent fluidity and dyeing power and high pigment dispersion and dispersion stability. The pigment dispersion constituent comprises (a) pigment, (b) solvent, (c) dispersing agent with the polyester chain and (d) dispersant with acid value of 65-250 mgKOH / g, wherein preferably the dispersant concludes a copolymer of the weight average molecular weight 1000-100000 including a constitutional unit expressed with a following general formula (1). R1 expresses an alkyl group with a hydrogen atom or 1-8 carbon atoms among a general formula (1).

Description

technical field [0001] The present invention relates to a pigment dispersion composition which is excellent in use adaptability, especially non-agglomeration, non-crystallinity, fluidity, and excellent tinting power. Pigment dispersion composition for color filters used in liquid crystal color displays, solid-state imaging devices, and the like. This patent application claims the priority of Japanese Patent Application No. 2006-251751 filed on September 15, 2006. Background technique [0002] In general, a practically useful pigment that exhibits a vivid color tone and high tinting strength consists of fine particles. A pigment dispersion composition formed by dispersing such a pigment can be used in various fields because of the excellent color development and light resistance of the pigment. However, when the pigment particles are made finer in order to obtain high tinting strength, the viscosity of the pigment dispersion liquid tends to increase for various reasons, and...

Claims

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Application Information

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IPC IPC(8): C09B67/10C09D17/00C09B67/20C09B67/46C09D11/02C09D11/033C09D11/037C09K23/52
CPCC09D7/47C09D5/084
Inventor 长田崇一郎铃木成一杉原幸一藤牧一广松本知司黑田亨
Owner FUJIFILM CORP
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