Dainichiseika Color & Chemicals Mfg. Co., Ltd.

Ryo Hoshino

Hideki Ito

Shotoku Takami

Kazutaka Aoki

Kazuhiko Kaneko

Shigeru Inoue

Masahiro Takayama

Satoru Matsuzaki

Shigeyuki Nagasato

A C.I. Pigment Yellow 74 as an insoluble azo pigment is provided. This C.I. Pigment Yellow 74 is crystalline particles. The ratio (26.6&#xb0;/11.7&#xb0;) of a diffraction intensity of a peak at 26.6&#xb0; to a diffraction intensity of a peak at 11.7&#xb0; in terms of Bragg angle (2&#x3b8;&#xb1;0.2&#xb0;) as measured by powder X-ray diffraction using CuK &#x3b1;-radiation is 0.85 to 1.12, and the average primary particle size is 20 to 130 nm. The use of this C.I. Pigment Yellow 74 as a colorant in a coloring composition enables to provide the coloring composition with excellent dispersibility and good particle size stability and storage stability compared with conventional pigments. The use of this coloring composition enables the formation (recording) of images having excellent clarity and transparency of such high levels that have not been achievable by conventional technologies.

C.I. pigment yellow 74 (insoluble AZO pigment), and coloring composition using same

Pigment compositions each contain an organic pigment and at least one compound selected from compounds represented by the following formula (II), respectively:A-N&#x2550;N&#x2014;CH(COCH)&#x2014;CONH-E,B&#x2014;N&#x2550;N&#x2014;CH(COCH)&#x2014;CONH-E orC&#x2014;N&#x2550;N&#x2014;CH(COCH)&#x2014;CONH-E,wherein A represents a substituted or unsubstituted phenyl group, B represents a substituted or unsubstituted &#x3b2;-naphthyl group, C represents a substituted or unsubstituted &#x3b1;-anthraquinonyl group, D represents a particular substituted aromatic group, and E represents a substituted or unsubstituted phenyl group, with a proviso that the compounds each have at least one substituent represented by &#x2014;COOM or &#x2014;SOM in which M represents a hydrogen atom, metal atom, ammonium group, organic amine group or quaternary ammonium group. Colored compositions making use of the pigment compositions and color filters making use of the colored compositions are also disclosed.

Pigment compositions, colored compositions making use of the pigment compositions, and color filters

Pigment compositions each contain an organic pigment and at least one compound selected from compounds represented by the following formulas (I) or (II), respectively:A-N&#x2550;N-D, B&#x2014;N&#x2550;N-D or C&#x2014;N&#x2550;N-D&#x2003;&#x2003;Formula (I)A-N&#x2550;N&#x2014;CH(COCH)&#x2014;CONH-E,B&#x2014;N&#x2550;N&#x2014;CH(COCH)&#x2014;CONH-E orC&#x2014;N&#x2550;N&#x2014;CH(COCH)&#x2014;CONH-E&#x2003;&#x2003;Formula (II)wherein A represents a substituted or unsubstituted phenyl group, B represents a substituted or unsubstituted &#x3b2;-naphthyl group, C represents a substituted or unsubstituted &#x3b1;-anthraquinonyl group, D represents a particular substituted aromatic group, and E represents a substituted or unsubstituted phenyl group, with a proviso that the compounds each have at least one substituent represented by &#x2014;COOM or &#x2014;SOM in which M represents a hydrogen atom, metal atom, ammonium group, organic amine group or quaternary ammonium group. Colored compositions making use of the pigment compositions and color filters making use of the colored compositions are also disclosed.

Growing community of inventors

Chuo-ku, Japan

Ryo Hoshino