Dainichiseika Color & Chemicals Mfg. Co., Ltd.

Hiroaki Saikatsu

Michiei Nakamura

Shigeru Sakamoto

Yoshio Abe

Hiromitsu Yanagimoto

Hisao Okamoto

Akio Yoshida

Mitsuo Yamazaki

Naoto Kamata

Tetsuo Fukuda

Seishichi Sasaki

Atsushi Nogami

Norio Tanaka

Hiroyuki Shimanaka

Shojiro Horiguchi

Naomi Oguma

Shiro Yamamiya

Yoshifumi Sugito

Yoshiyuki Zama

Yutaka Miura

Shotoku Takami

Naoki Hirata

Naoyuki Sakai

Kazuo Kanou

Masaru Hasegawa

Osamu Suda

Masanori Takakamo

Kazutaka Aoki

Yoshimasa Tsuchiya

Hisao Kouno

Takayuki Soga

Hideyuki Koiso

Shirou Yamamiya

Hisao Kono

Toshifumi Sekino

Tetsuhiro Umezaki

Shigeru Ohki

Kazuhito Ooki

This invention relates to a dispersant for an organic pigment comprising a compound represented by the below-described formula (1) or (2), and also to its use. According to the present invention, it is possible to provide a dispersant or the like, which can afford a coating formulation for a color filter. The coating formulation is prevented from an increase in viscosity and a reduction in storage stability even when the concentration of a pigment is high, and can fabricate the color filter with excellent transparency and color quality. 

Dispersing agent for organic pigment and use thereof

A dispersant for an organic pigment contains a compound represented by the following formula (1): wherein Rand Rmay be the same or different and each independently represents a hydrogen atom, a halogen atom, a hydroxyl group, a primary, secondary or tertiary amino group, an alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted phthalimidomethyl group, Rand Rmay be the same or different and each independently represents a hydrogen atom or a lower alkyl group, and n means an average number of introduced sulfonic groups and stands for a number of from 0.5 to 3; or at least one salt selected from the group consisting of its metal salt, ammonium salt, organic amine salt, and organic quaternary ammonium salt. Also disclosed are a readily-dispersing pigment composition, a pigment dispersion, a colored coating fluid for color filters, a fabrication process of a color filter and a color filter, all of which make use of the dispersant.

Dispersants for organic pigments

A pigment dispersant contains the following component (a) alone or the following components (a) and (b) in combination: Component (a): a composite pigment formed of a diketopyrrolopyrrole pigment having a sulfonic group and another diketopyrrolopyrrole pigment having no sulfonic group, wherein the number of sulfonic group per molecule of the diketopyrrolopyrrole pigments in the composite pigment is from 0.05 to 0.5; and Component (b): a pigment other than the component (a), wherein the pigment has a sulfonic group or its metal salt, ammonium salt or amine salt. Also disclosed are a colored composition for color filters, a process for the fabrication of a color filter, the color filter fabricated by the process, an image display device including the color filter, and an information communication equipment including the image display device. These colored composition, process, color filter, image display device and information communication equipment all make either direct or indirect use of the pigment dispersant.

Pigment dispersants and their use

There is disclosed a pigment dispersant comprises the compound represented by the following formula (I) or a metal salt, ammonium salt, amine salt or alkylammoniumchloride salt thereof. Also disclosed are a colored composition for CF, a process for the fabrication of a CF, the color filter fabricated by the process, an image display device including the color filter, and an information communication equipment including the image display device. These colored composition, process, color filter, image display device and information communication equipment all make either direct or indirect use of the pigment dispersant 

Image-recording, hydrophilic colorants having an organic pigment linked to a hydrophilic compound through a linking group and which are capable of forming images excellent in print quality such as chroma, gloss, density, light fastness and abrasion fastness, and also as hydrophilic colorants capable of affording inks excellent in physical properties such as long-term storability and press stability are described.

Hydrophilic coloring matter for recording image, aqueous coloring agent for recording image, method and device for recording image

A pigment dispersion is composed of a pigment, a polymer and a solvent. The polymer has, on side chains thereof, carboxyl groups derived from a dibasic acid. The pigment dispersion is useful for writing instruments and printers.

Pigment dispersions, and writing instruments and printers with the dispersions stored therein

Pigment dispersants and pigment compositions containing the same

Pigment dispersions for color filters are composed of pigments, dispersants, film-forming resins and liquid media. The dispersants comprises compounds represented by the following formula (I):

Pigment dispersions for color filters, fabrication process of color filters, and color filters

Dispersants for organic pigments comprise compounds represented by the following formula (I):

Pigment dispersants, pigment dispersions and writing or recording pigment inks

Disclosed is a pigment dispersant represented by the following formula (1): ##STR1## wherein X represents a hydrogen atom or an acylamino group; Y represents a specific aromatic group; Z represents a specific aromatic group or a C.sub.2-30 aliphatic, alicyclic or hetero-alicyclic amine reaction residual group having at least one amino group; G represents a reaction residual group of at least one compound selected from C.sub.2-30 aliphatic, alicyclic and hetero-alicyclic hydrocarbons each of which has at least one amino group; n is an integer of from 0 to 3; and when N stands for O, Z represents a reaction residual group of a C.sub.2-30 aliphatic, alicyclic or hetero-alicyclic polyamine having at least two amino groups. A pigment dispersion making use of the dispersant and a color filter produced from the pigment dispersion are also disclosed.

Pigment dispersant, pigment dispersion, and pigment dispersion for color

An electrophotographic photoreceptor is provided with a photosensitive layer, which contains an azo compound having in the molecule thereof at least one azo group coupled with a couple residuum represented by the following general formula (I): ##STR1## wherein X means an atomic group necessary for condensing with a benzene ring to form a substituted or unsubstituted aromatic hydrocarbon ring, or substituted or unsubstituted aromatic heterocyclic ring, Y denotes a radical selected from the group consisting of hydrogen, halogen atoms, cyano radicals, and substituted or unsubstituted alkyl, or alkoxy group, and n stands for an integer of 0.about.4, R.sub.1 and R.sub.2 designate, respectively, hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted alalkyl, substituted or unsubstituted aromatic hydrocarbon ring or substituted or unsubstituted aromatic heterocyclic ring, and said R.sub.1 and R.sub.2 may be mutually same or different, or may form a ring together with nitrogen atom.

Electrophotographic photoreceptor comprising azo compound and coupler

Growing community of inventors

Chuo-ku, Japan

Hiroaki Saikatsu