Tomoegawa Paper Co., Inc.

Unitika Ltd.

Haruo Okutani

Kazue Nakadera

Hideki Kurebayashi

Koji Nakayama

Toshio Tagami

Tsutomu Kurokoshi

Kouta Tanahashi

Kikumi Nakamichi

Naomi Sasaki

Tomoko Kubota

The object of the present invention is to provide new resins having excellent compatibility with other resins, in addition to a low melting temperature, and a low viscosity, and to provide a toner which can be fixed at low temperature without losing its shelf life, and showing an offset phenomenon, and have an excellent fixing strength to a transfer paper by using the improved olefin resin as a binder resin; these objects can be achieved by an olefin resin which is a copolymer of an &agr;&mdash;olefin and at least one constituent selected from the group consisting of maleic anhydride and maleate, wherein said at least one constituent selected from the group consisting of maleic anhydride and maleate is crosslinked, and by rev toners comprising the same.

Olefinic resin and electrophotographic toner prepared therefrom

An electrophotographic toner excellent in fixing properties at a low temperature, resistance to offsetting and shelflife and suitable for a heat-fixing method can be provided by an electrophotographic toner containing, as a binder, a polyester resin having a carbodiimide crosslink or an electrophotographic toner containing a carbidiimide-crosslinked polyester resin and a low melting point compound having a melting initiation temperature of 60 to 100.degree. C.

Electrophotographic toner

Polyester resin for electrophotography toner, process for preparing the

A polyester resin for a toner, wherein a maximum molecular weight is in a range of 1.times.10.sup.3 to 8.times.10.sup.3, Mw/Mn is in a range of 20 to 200, a proportion of component having a molecular weight of 1.times.10.sup.5 or less is comprised at a range of 80 weight % or greater, and at least one component selected from the group consisting of polycarboxylic acid having more than 3 carboxyl groups and polyalcohol having more than 3 hydroxyl groups.

Polyester resin for use in toner binder and process for producing the

A toner for developing an electrostatic image comprising at least a colorant and a binder resin, characterized in that the main component of the binder resin is a polyester resin, and the polyester resin is containing a polymer prepared by reacting a polyester oligomer and at least one compound selected form the group consisting of long chain alcohols and long chain carboxylic acids which have 12 or more carbon atoms.

Toner for developing static charge images and process for preparing the

A toner for developing an electrostatic image, which is excellent in low-temperature fixing properties, the prevention of offsetting and uniform chargeability, and which comprises a colorant and a polyester resin modified with an ethyleneimine derivative.

Toner for developing electrostatic image

A toner for developing an electrostatic image, which is composed of a binder resin and a colorant as main components, said binder resin containing a phenolic hydroxyl group-containing polyester resin as a main component, which toner is energy-saving, suitable for use in a contact heat fixing method using a hot roller, has a high fixing strength at a low temperature and excellent offset preventing properties and is excellent in fixing strength and offset preventing properties in a broad fixing temperature range.

Growing community of inventors

Shizuoka, Japan

Haruo Okutani