Sanyo Chemical Industries, Ltd.

Naoki Takase

Hideo Nakanishi

Hiroshi Kishiki

Syuji Yamada

Tohru Ohama

Akira Kodani

Munekazu Satake

Tomohisa Kato

Hiroyuki Ikeda

Yoko Sakurai

Tatsuyoshi Ishii

Disclosed herein is a polyester resin-based toner binder which can impart both excellent anti-blocking property under high temperature and humidity conditions and low-temperature fixing properties to a toner. The toner binder for developing electrostatic images includes a polycondensation polyester resin produced in the presence of at least one titanium-containing catalyst (a) represented by the following general formula (I) or (II):Ti(&#x2014;X)m(&#x2014;OH)n&#x2003;&#x2003;(I)O&#x2550;Ti(&#x2014;X)(&#x2014;OR)&#x2003;&#x2003;(II)

Toner binder and toner

Resin for toner binder and toner composition

The present invention provides a toner binder for developing electrostatic charge images, Furthermore, the present invention provides a toner binder for developing electrostatic charge images,

A charge controller for a toner, containing a polymer of an ethylenically unsaturated monomer, where the polymer has a dielectric loss tangent (tan .delta.) at 100 kHz of 0.008 to 0.3 and a water absorbency of at most 10% by weight, and selected from the group consisting of:

Charge controller, toner binder composition and electrophotographic toner

A charge controller for an electrophotographic toner is disclosed which comprises a graft or block copolymer comprising:

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Kyoto, Japan

Naoki Takase