Toner

• US 7,396,626 B2
• Filed: 09/14/2005
• Issued: 07/08/2008
• Est. Priority Date: 04/28/2004
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Tanikawa, Hirohide, Ishigami, Koh, Okamoto, Naoki, Baba, Yoshinobu, Itakura, Takayuki, Fujikawa, Hiroyuki, Sugahara, Nobuyoshi
• Primary Examiner(s): Goodrow; John L
• Application Number:
  US11/225,064
• Publication Number:
  US 20060008723A1
• Time in Patent Office: 1,028 Days
• Field of Search: 430/108.6, 430/109.4
• US Class Current: 430/108.6
• CPC Class Codes: G03G 9/08755 Polyesters
• CPC Class Codes: G03G 9/08797 characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature
• CPC Class Codes: G03G 9/09708 Inorganic compounds
• CPC Class Codes: G03G 9/09725 Silicon-oxides; Silicates

Abstract

The present invention provides a toner improved in dispersibility of a colorant in the toner particles and excellent in the color reproducibility including color mixability and transparency. The toner is also excellent in the stability in long-term of the chargeability and capable of forming images maintaining high image quality. The present invention provides a toner for forming a full-color image which includes at least toner particles containing a binder resin, a colorant and a wax, and inorganic fine particles, wherein the binder resin comprises a resin having polyester units which is synthesized by use of an aromatic carboxylic acid titanium compound as a catalyst, and the inorganic fine particles comprise fine titanium oxide particles.

Claims

1. A toner for forming a full-color image comprising at least:

toner particles containing a binder resin, a colorant and a wax, and inorganic fine particles, wherein;

said binder resin comprises a resin having polyester units which is synthesized by use of an aromatic carboxylic acid titanium compound as a catalyst; and

said inorganic fine particles comprise fine titanium oxide particles and fine silica particles.

2. The toner according to claim 1, wherein the transmittance (%) thereof in an aqueous solution of 45% by volume of methanol falls within a range from 10% to 70%.

3. The toner according to claim 1, wherein, in an endothermic curve thereof in differential scanning calorimetry (DSC), a temperature at which a maximum endothermic peak is exhibited in a temperature range from 30°

C. to 200°

C. falls within a range from 60°

C. to 130°

C.

4. The toner according to claim 1, wherein said aromatic carboxylic acid titanium compound is a reaction product between an aromatic carboxylic acid and a titanium alkoxide.

5. The toner according to claim 4, wherein said aromatic carboxylic acid is a di or more valent aromatic carboxylic acid and/or an aromatic oxycarboxylic acid.

6. The toner according to claim 4, wherein said titanium alkoxide is a compound represented by the following general formula (1):