C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
C09B 57/04 (2006.01) C09B 29/01 (2006.01) C09B 29/36 (2006.01) C09B 67/00 (2006.01)
Patent
CA 2365794
Near-infrared transmitting black azo pigments are represented by the following formula (1) and have a crystalline form selected from the group consisting of a thin, long crystalline form and a leaf-shaped crystalline form. (see formula 1) wherein R represents at least one group selected from the group consisting of lower alkyl groups having 1 to 3 carbon atoms and lower alkoxy groups having 1 to 3 carbon atoms, n stands for an integer of from 1 to 5, and, when n is other than 1, Rs may be the same or different. These near-infrared transmitting black azo pigments can be produced by treating the corresponding black azo pigments of the formula (1) with an alkali in an alcohol. Near-infrared transmitting black azo pigments compositions each comprises one or more of the near-infrared transmitting black azo pigments and a near-infrared transmitting material as a vehicle.
Abe Yoshio
Nakamura Michiei
Okamoto Hisao
Yamamiya Shirou
Yanagimoto Hiromitsu
Dainichiseika Color & Chemicals Mfg. Co. Ltd.
Marks & Clerk
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