Abstract:
PROBLEM TO BE SOLVED: To provide a method of manufacturing a pigment dispersion for color filters with low viscosity and excellent storage stability, containing as few coarse pigment particles as possible.SOLUTION: The method of manufacturing a pigment dispersion for color filters is composed of a first process and a second process mentioned below: the first process is a process in which a mixture containing at least a pigment, a water-insoluble dispersant and an organic solvent is preliminarily dispersed with the use of a roll mill having at least three rolls so that the average film thickness of the mixture on the rolls is 0.05 to 20 μm; and the second process is a process in which the preliminary dispersion obtained in the first process is dispersed by a medium-type disperser filled with medium particles with a diameter of 0.1 mm or less.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a dispersion of water-insoluble vinyl polymer particles containing a hydrophobic dye, which is used for a water-based ink for ink jet recording and has a good printing property and storage stability. SOLUTION: The method for producing a dispersion of water-insoluble vinyl polymer particles containing a hydrophobic dye for ink jet printing is a method for producing a dispersion of water-insoluble vinyl polymer particles, which comprises the steps of adding water and a neutralizer to a mixed solution containing a hydrophobic dye, a water-insoluble vinyl polymer having a salt-forming group with an acid value of between 70 and 130, and an organic solvent and neutralizing the above water-insoluble vinyl polymer having the salt-forming group, wherein the concentration of a neutralizer in the total water content within the system is maintained at a prescribed level of 0.3 or less upon neutralization. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a manufacturing method for color filter pigment dispersions, which allow for controlling a contrast ratio of a color filter produced from a pigment dispersion through a simple procedure, and to provide a method of evaluating a contrast ratio of a coating film produced from the pigment dispersion.SOLUTION: A manufacturing method for a color filter pigment dispersion involves measuring an optical parameter from a spectral reflectivity and applying a dispersion process on a mixed liquid containing an organic pigment, a dispersant, and a dispersion medium until an optical parameter value (A) derived from the following steps (1)-(3) is obtained. Step (1): A step for obtaining a plurality of pigment dispersions with different dispersion conditions by applying a dispersion process on the mixed liquid containing the organic pigment, dispersant, and dispersion medium. Step (2): A step for measuring contrast ratios of coating films produced from the plurality of pigment dispersions obtained in the step (1) and optical parameter values computed from spectral reflectivities of the pigment dispersions to derive a relationship between the contrast ratio values and the optical parameter values. Step (3): A step for determining an optical parameter value (A) that achieves a target contrast ratio from the relationship derived in the step (2).
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a non-aqueous pigment dispersion with low viscosity for use in a color filter manufactured by an inkjet system and to provide a coloring composition for a color filter that contains the pigment dispersion produced by the method. SOLUTION: The method for producing a non-aqueous pigment dispersion for a color filter manufactured by an inkjet system has a step (1) of kneading an organic pigment, a polymeric dispersant and an organic solvent having a boiling point of 170-260°C under conditions where the concentration of the solids composed of the organic pigment and the polymeric dispersant is 30-80 wt.% and the weight ratio of [the polymeric dispersant/the organic pigment] is 0.5 to 2 to produce a kneaded product, a step (2) of diluting the resultant kneaded product with an organic solvent and dispersing the same to produce a pigment dispersion and a step (3) of removing a part or all of the polymeric dispersant not having been adsorbed on the pigment from the resultant pigment dispersion. The coloring composition for a color filter contains the pigment dispersion produced by the method. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide the device for correcting an unbalanced load (mass eccentricity) on the rotational center of the optical disk. SOLUTION: The direction and size of an unbalanced load are measured by an unbalanced load measuring device 1 in rotating the optical disk OD with rotation angle information from an angle sensor 6 and distortion amt. information of a rotary shaft 5 from a gap sensor 7. Based on the direction and size of the measured unbalanced load, position control and operation control of an ink discharger 15 are performed to apply a printing ink as a weight on the optical disk OD by a weight attaching device 11 to cancel the unbalanced load.
Abstract:
PROBLEM TO BE SOLVED: To provide a method of efficiently manufacturing low-viscosity pigment dispersions having a small average particle diameter.SOLUTION: A manufacturing method for color filter pigment dispersions includes a first step and a second step as follows. In the first step, a mixed liquid containing an organic pigment, a polymer dispersant, and an organic solvent is processed using a high-speed agitating medialess disperser under an agitating condition with an agitation speed exceeding 900,000 [1/sec] to crush the organic pigment and obtain a dispersion. In the second step, the dispersion obtained in the first step is processed using a media disperser filled with dispersion media particles.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a nonaqueous pigment dispersion excellent in viscosity, and to provide a colored composition for a color filter containing the nonaqueous pigment dispersion. SOLUTION: [1] The method for producing a nonaqueous pigment dispersion includes: a step (1) in which a predispersion is obtained by dispersing a pigment and a first dispersant in an organic solvent by a media-type disperser; a step (2) in which a pigment dispersion is obtained by further dispersing the obtained predispersion and a second dispersant having a less adsorption rate to the pigment than the first dispersant by the media-type disperser; and a step (3) in which the dispersant which is not adsorbed to the pigment is removed from the obtained pigment dispersion. [2] The colored composition for a color filter contains the nonaqueous pigment dispersion obtained by the method. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing nonaqueous pigment dispersion excellent in storage stability, and to provide a coloring composition for color filter comprising the nonaqueous pigment dispersion. SOLUTION: There are provided: (1) a method for producing nonaqueous pigment dispersion including subjecting a pigment dispersion comprising a pigment, water-insoluble polymer and an organic solvent, to a centrifugation treatment or a filtration treatment to eliminate water-insoluble polymer not adsorbed on the pigment; and (2) a coloring composition for color filter including the nonaqueous pigment dispersion obtained by the method. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a non-aqueous pigment dispersion excellent in preservation stability, and a coloring composition for color filters containing the non-aqueous pigment dispersion. SOLUTION: (1) The method for producing a non-aqueous pigment dispersion is to prepare a pigment dispersion by mixing a pigment, organic solvent and water insoluble polymer dispersant, add a 1-5C alcohol to the dispersion, subsequently treat the dispersion by filtration to remove the water insoluble polymer dispersant and (2) the coloring composition for color filters contains the non-aqueous pigment dispersion prepared by the method. COPYRIGHT: (C)2010,JPO&INPIT