Ricoh Company, Ltd. (Tokyo, JP)

It also contains a resin which can be utilized in toner. The resin consists of an oligomer segment and an elongated segment. The oligomer segment comprises a polyhydroxycarboxylic skeleton and an aromatic diol skeleton.

1. Technical Field

This disclosure is about the possibility of using a resin utilized in toner, toner with it, developers of toner using the image forming and toner apparatus and methods using the toner.

2. Description of Related Art

A device for electrophotography that produces an image, or produces a magnetic latent image, or electrostatic recording device, can be used to transform the image into a toner. In electrophotography, for instance an electrostatic image is formed on a photoreceptor and is developed into an image that is toner. The image of the toner is transferred to a medium for recording such as paper and fixed with heat.

Toner generally comprises resin particles in which colorant, charge controlling agent, etc., are dispersed, and is manufactured by various processes, such as pulverization, suspension polymerization, dissolution suspension, emulsion aggregation,phase-transfer emulsification, and elongation polymerization.

The thermoplastic resin can be used to make the resin particles, such as polyester resin, styreneacrylic resin or polyol resin. Polyester resin is more durable and durability, as well as having a lower point of softening having a higher molecular mass and a higher glass transition temperature compared to styrene-acrylic resin. So, polyester resin is frequently utilized for toner, particularly those that require low-temperature fixability. Particularly the possibility of printing in full color is achievable using polyester resin.

Binder resin generally occupies 70% or more of toner composition. Binder resins are most often made from petroleum resources that are at risk of being exhausted. Petroleum resources contribute to the problem of global warming because they release carbon dioxide into air when consumed. Binder resins derived from plant resources have been suggested and used as toners. Because plant resources incorporate carbon dioxide from the air as they grow and releasing carbon dioxide, the carbon dioxide released by plant resources is transported between the air and the plant resources. Plant resources are able to solve the issue of global warming as well as depletion. For instance polylactic acid, which can be easily accessible, has been used to make toner binder.

High crystallinity is achieved with polylactic acids made of L-form and D-form. These polylactic acids are not readily dissolve in organic solvents and therefore cannot be used to produce toners containing binder resin. Therefore, polylactic acids are utilized in the pulverization process but the pulverization processes undesirably produce a lot of toner particles during the process of classification.

Japanese Patent Application Publication No. 2008-262179 proposes mixing L-form and D-form polylactic acids to decrease crystallinity. In this document, it is revealed that the solubility of organic solvents could be increased.

Japanese Patent Application Publication No. 08-302003 describes a copolymerized polylactic acid obtained by reacting lactic acid with a reaction product of an aromatic dicarboxylic acid with an aliphatic diol, having a low glass transitiontemperature of C. or less. Japanese Patent Application Publication No. 2007-112849 describes the copolymerization of polylactic acid, which has an elongated skeleton of fluorenone, with a glass transition temperature of C. or greater.

To improve low-temperature fixability, Japanese Patent Nos. 3778955 and 4307367 each suggest to introduce a soft segment into binder resin.

A resin that is used as a toner according to some methods. The resin comprises an oligomer segment as well as an elongated segment. The oligomer segment comprises a polyhydroxycarboxylic skeleton and an aromatic diol skeleton.

According to certain examples, a toner can be supplied. The resin mentioned above is included in the toner.

According to some embodiments, a developer is supplied. The developer is comprised of the toner described above.

Image forming apparatus and an approach to creating images are offered in accordance with specific embodiments. The above toner is employed in the image-forming apparatus and method.

In accordance with some embodiments, a method for manufacturing resin is disclosed. The method includes the step of reacting a hydroxycarboxylic acid or a cyclic ester thereof with an aromatic diol to obtain an oligomer having apolyhydroxycarboxylic acid skeleton and an aromatic diol skeleton. The method further includes the step of reacting the oligomer with soft materials using an elongating agent.

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