Yellow toner

Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...

Reexamination Certificate

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C430S109300, C430S109400

Reexamination Certificate

active

11223989

ABSTRACT:
To provide a yellow toner allowing formation of an image with an excellent transparency for an OHP, an excellent coloring power, and an excellent light resistance. In the yellow toner including at least a yellow pigment containing a monoazo compound represented by the following formula (1), the value of a* is in the range of −5 to +14 when b* is +80 with respect to a transmission chromaticity of an image formed on a transparency sheet.(wherein X1to X6each independently denotes a substituent selected from the group consisting of a hydrogen atom, a C1–3 alkyl group, a C1–3 alkoxyl group, a nitro group, a halogen group, a sulfonic group, a sulfamoyl group, a sulfamoyl group substituted with an aromatic group, a carboxyl group, and a carboxylate; each may bond with another to form a benzene ring or an imidazolone ring.)

REFERENCES:
patent: 5562075 (1996-10-01), Walsh
patent: 6620566 (2003-09-01), Yamauchi
patent: 2001/0023048 (2001-09-01), Shoji et al.
patent: 2004/0202952 (2004-10-01), Albright et al.
patent: 08-234489 (1996-09-01), None
patent: 10-171165 (1998-06-01), None
patent: 2000-63694 (2000-02-01), None
patent: 2001-166540 (2001-06-01), None
patent: 2001-228653 (2001-08-01), None
patent: 2003-149859 (2003-05-01), None
Diamond, A.S., “Handbook of Imaging Materials”, New York, Marcel Dekker, Inc., (1991), pp. 163-170.
Machine Translation of JP10-171165 (Jun. 1998).
Sharma, G. , “Digital Color Imaging Handbook”, Boca Raton: CRC Press (Dec. 2002), pp. 30-32.

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