Toner
OwnerTakashige Kasuya, Hirohide Tanikawa +4inventors
InventorsTakashige Kasuya, Hirohide Tanikawa, Hiroshi Yusa, Yoshihiro Ogawa, Katsuhisa Yamazaki, Ryota Kashiwabara
Life of this patent
Estimating the term…
Abstract
A toner showing quick chargeability and stable chargeability in a high humidity environment is provided by a combination of a specific polyester binder resin and a specific azo iron compound. The polyester binder resin has an acid value (Av) of 0.5 to 30 mgKOH/g and a hydroxyl value (OHv) of 1 to 50 mgKOH/g giving a ratio (Av/OHv) therebetween satisfying: 0.05≦Av/OHv≦2.0. The azo iron compound is preferably an iron complex (salt) including as a ligand a mono-azo compound formed by diazo coupling between a 2-aminophenol (derivative) and an alkyl-substituted naphthol (derivative).
Claims18
A toner, comprising:
- at least a binder resin, a colorant and an organometallic compound;
- wherein
- said organometallic compound is an azo iron compound produced from a mono-azo compound of Formula (A) below:
- 19
- wherein R1-R10 independently denote hydrogen, halogen or alkyl with the proviso that one or more adjacent pairs among R1-R10 can be connected to form an aromatic or alicyclic ring, and at least one of R5-R10 is alkyl,
- the binder resin comprises a polyester resin and has an acid value (Av) of 0.5 to 30 mgKOH/g and a hydroxyl value (OHv) of 1 to 50 mgKOH/g giving a ratio (Av/OHv) therebetween satisfying a relationship of:
- 0.05≦Av/OHv≦2.0.
Dependencies are inferred from the claim text.