Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1995-07-03
1998-09-29
Dote, Janis L.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430106, 430110, 430111, 430137, G03G 9087
Patent
active
058144277
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a decolorizable toner and a process for preparing the same, and more particularly to a decolorizable toner which can make an electric latent image or an electric signal used in electrophotography, electrostatic recording materials and the like visible, and a process for preparing the same.
BACKGROUND ART
In recent years, for the purpose of protection of natural environment, in particular protection of forest resources, and diminution of refuse in cities, reuse or recycling of used papers has been reconsidered. As a part thereof, reuse of waste papers such as useless used copied paper, printed paper and facsimile paper which are generated in offices of enterprise or the like has been studied.
However, since confidential papers of the inside of enterprises, which are generally dealed with industrial secrets, occupy the most part of these waste papers, it is extremely difficult that these waste papers are collected and recycled by a paper-manufacturing company which is outside the enterprises. Moreover, since a recorded part or printed part of a printed matter, a duplicate or the like cannot be easily erased, these waste papers are obliged to be disposed by incinerating or shredding. Therefore, it is thought that reuse of such papers or the like is actually almost impossible. Also, as to recycling of waste papers which are shredded by means of a shredder or the like, some studies have been carried out. However, since the strength of recycled papers produced by using such shredded waste papers is generally low, there was a defect that the recycled papers do not endure the using as, for instance, information paper and the like.
Thereupon, as a method for recycling these waste papers easily and safely, it is proposed that after copying or printing with a decolorizable toner in which a resin binder containing a decolorizable dye having a characteristic of being decolorized by near infrared rays is contained, the decolorizable toner is decolorized by irradiating with near infrared rays (Japanese Unexamined Patent Publication No. 362935/1992, Japanese Unexamined Patent Publication No. 119520/1993).
However, as to the above decolorizable toner, property, it is difficult to control an electrically charged amount of the obtained decolorizable toner, and imparting characteristics to a toner such as an electric charge regulator, the decolorizable dye is decolorized during the production of a toner, and after the production of the toner, problems arised in decolorizing property of the toner and its quality of image.
The present invention has been accomplished in consideration of the above-mentioned prior art. The present invention aims at providing a process for preparing a decolorizable toner, in which an electrically charged amount of an obtained decolorizable toner is easily adjusted and a dye is hard to be decolorized during kneading in the production of a toner, and a decolorizable toner which can be speedily decolorized during its erasure.
DISCLOSURE OF INVENTION
The present invention relates to (1) a decolorizable toner of which main components are a visible ray-near infrared ray-absorbing dye, a decolorizing agent and a resin binder, characterized in that a resin binder A with which the visible ray-near infrared ray-absorbing dye is blended is dispersed in a resin binder B, and that the decolorizing agent is blended with at least one of the resin binder A and the resin binder B, (2) a process for preparing a decolorizable toner of which main components are a visible ray-near infrared ray-absorbing dye, a decolorizing agent and a resin binder, characterized by heating to melt and kneading a resin binder A which contains the visible ray-near infrared ray-absorbing dye and the decolorizing agent, and a resin binder B, cooling and thereafter pulverizing them, and (3) a process for preparing a decolorizable toner of which main components are a visible ray-near infrared ray-absorbing dye, a decolorizing agent and a resin binder, characterized by heating to melt an
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Abe Yuki
Hosoda Yoshikazu
Murofushi Katsumi
Nagami Harushi
Uchino Mitsuhiro
Bando Chemical Industries Ltd.
Dote Janis L.
Showa Denko K.K.
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