Kao Corporation

Kota Ijichi

Nobumichi Kamiyoshi

Kunihiro Kano

Takashi Kubo

Akitaka Mitsuji

A resin binder composition for toners, containing a polyester resin A which is a polycondensate A of raw materials A containing an alkylene oxide adduct of bisphenol A, an aromatic dicarboxylic acid compound, a trivalent or higher polyvalent raw material monomer being at least any one of a trihydric or higher polyhydric alcohol and a tricarboxylic or higher polycarboxylic acid compound, and an amorphous acid modified product A of an α-olefin polymer having 4 to 18 carbon atoms, the polyester resin A having a softening point of 120° C. to 150° C.; and a toner for electrostatic image development, containing the resin binder composition. The resin binder composition is suitable for a toner for electrostatic image development used in development of latent images formed in electrostatic image development, electrostatic recording and electrostatic printing.

Binder resin composition for toner

A resin binder composition for toners, containing a polyester resin A that is a polycondensate of an alcohol component containing 80% by mol or more of an aliphatic diol having 2 or more carbon atoms and 6 or less carbon atoms and a carboxylic acid component containing an aromatic dicarboxylic acid compound and an amorphous acid modified product A of an α-olefin polymer having 4 or more carbon atoms and 18 or less carbon atoms; and a toner for electrostatic image development, containing these resin binder composition for toners. The resin binder composition for toners of the present invention is suitably used for a toner for electrostatic image development which is usable in development of latent images formed in, for example, electrostatic image development method, electrostatic recording method, electrostatic printing method or the like.

Binder resin compositions for toner

A resin binder composition for toners, containing a polyester resin A having a constituting unit derived from an alcohol component containing an alkylene oxide adduct of bisphenol A and a constituting unit derived from a carboxylic acid component containing an amorphous acid modified product A of an α-olefin polymer having 4 or more carbon atoms and 18 or less carbon atoms; a resin binder composition for toners containing a polyester resin A which is a polycondensate of an alcohol component containing an alkylene oxide adduct of bisphenol A and a carboxylic acid component containing an amorphous acid modified product A of an α-olefin polymer having 4 or more carbon atoms and 18 or less carbon atoms; and a toner for electrostatic image development, containing these resin binder composition for toners. The resin binder composition for toners of the present invention is suitably used for a toner for electrostatic image development which is usable in development of latent images formed in, for example, electrostatic image development method, electrostatic recording method, electrostatic printing method or the like.

To provide a toner for electrophotography and a binder resin, exhibiting an excellent fog suppression capability. A toner for electrophotography and a binder resin each containing a resin A having at least a polyester moiety obtained through polycondensation of an alcohol component, a carboxylic acid component, and a polyhydroxyamine compound represented by the formula (1) in an amount of 0.01% by mass or more and 5.0% by mass or less based on the total amount of all the monomer components of the resin A.

Toner for electrophotography

To provide a toner for electrophotography exhibiting an excellent charge rise property, and a process for producing the same. [1] A toner for electrophotography containing a binder resin, and a polyhydroxyamine compound represented by the following formula (1) in an amount of 0.001 part by mass or more and 5.0 parts by mass or less per 100 parts by mass of the binder resin, and [2] a process for producing a toner for electrophotography, including: melt-kneading a toner raw material mixture containing a binder resin, and a polyhydroxyamine compound represented by the following formula (1) in an amount of 0.001 part by mass or more and 5.0 parts by mass or less per 100 parts by mass of the binder resin; and pulverizing a resulting melt-kneaded material.

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Wakayama, Japan

Kota Ijichi