Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1996-06-24
1998-02-03
Goodrow, John
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430120, G03G 9087
Patent
active
057142947
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a toner for electrophotography and electrostatic recording usable for visualizing a latent image formed on a photoconductive member, and a reinforcing agent used therefor. Also, the present invention relates to a method for forming fixed images which is carried out by using the above toner.
BACKGROUND ART
As disclosed in U.S. Patent Nos. 2,297,691 and 2,357,809 and other publications, conventional electrophotographic recording method comprises the steps of forming an electrostatic latent image by evenly charging a photoconductive insulating layer and subsequently exposing the layer to eliminate the charge on the exposed portion and visualizing the formed image by adhering colored charged fine powder known as a toner to the latent image (a developing process); transferring the obtained visible image to an image-receiving sheet such as a transfer paper (a transfer process); and permanently fixing the transferred image by heating, pressure application or other appropriate means of fixing (a fixing process). This electrophotography may further comprise, subsequent to the transferring of the visible image, a cleaning process comprising scraping off residual toners on the photoconductive member.
As indicated above, the toner must meet the requirements not only of the developing process, but also of the transfer process, the fixing process, and the cleaning process.
Examples of the typical fixing methods in the present invention include a heat-fixing method comprising heating and melting the toner and fixing the melted toner on a paper, etc.; and a pressure-fixing method comprising plastically deforming the toner by exerting pressure thereon and then fixing on a paper. From the viewpoints of simplicity of the apparatus and quality of the fixed images obtained upon fixing, a heat roller fixing method where a heat roller is used as a heating means of the toners is most frequently used.
In the heat-fixing method, the toners must be melted at a lowest temperature possible, and fixed to a recording medium, such as papers. In the recent years, from the viewpoint of energy conservation, there has been a high demand for a low-temperature fixing ability in the toner.
Proposed as methods for providing low-temperature fixing ability to the toners, Japanese Patent Examined Publication No. 55-6895 discloses that molecular weight distributions of styrenic copolymers, polyester resins, etc. are widened; and Japanese Patent Examined Publication No. 63-32182 discloses that the low-temperature fixing ability can be improved by having a molecular weight distribution with a double peak structure and shifting the molecular weight distribution to a lower molecular weight side. Similarly, as proposed in Japanese Patent Examined Publication No. 51-23354, a method of blending a crosslinked polymer and a low-molecular weight polymer is also frequently employed.
However, in these methods, since a large amount of low-molecular weight resins must be contained in the binder resins for toners in order to secure the low-temperature fixing ability, the toners are liable to be pulverized too finely. In other words, in the toner for two-component developer usable by mixing the toner with a carrier, the toner is broken by the impact stress from the carrier in the developer device, so that fine powders are increased, thereby leading to cause much background, or the fine powders are adhered to the carrier surface and thus taking away the charging ability of the carrier. On the other hand, even in the one-component developing method where no carriers are used, when a nonmagnetic one-component developing method is employed, for instance, pulverized fine powders produced by the stress between the charging blade and the developer roller are adhered to the charging blade and the developer roller, thereby failing to have stable image reproducibility.
Also, on the other hand, Japanese Patent Laid-Open No. 55-113054 proposes toners containing rubbery materials, such as diolefinic copolymers, thereby making
REFERENCES:
patent: 3900529 (1975-08-01), Beer
patent: 3941898 (1976-03-01), Sadamatsu et al.
patent: 4386147 (1983-05-01), Seimiya et al.
patent: 4486524 (1984-12-01), Fujisaki et al.
patent: 4499168 (1985-02-01), Mitsuhashi
patent: 4508875 (1985-04-01), Kishida et al.
patent: 4973538 (1990-11-01), Suzuki et al.
patent: 4985469 (1991-01-01), Chip et al.
patent: 5206299 (1993-04-01), Oshima et al.
patent: 5455315 (1995-10-01), Paine et al.
Patent Abstracts of Japan, vol. 95, No. 10, Nov. 30, 1995 (JP 07 181716A).
Patent Abstracts of Japan, vol. 95, No. 10, Nov. 30, 1995 (JP 07 181717A).
Patent Abstracts of Japan, vol. 95, No. 10, Nov. 30, 1995 (JP 07 181728A).
Patent Abstracts of Japan, vol. 95, No. 10, Nov. 30, 1995 (JP 07 181729A).
Hidaka Yasuhiro
Maruta Masayuki
Sata Shin-ichi
Shimizu Jun
Goodrow John
Kao Corporation
LandOfFree
Toner for electrophotography and reinforcing agent for said tone does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Toner for electrophotography and reinforcing agent for said tone, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Toner for electrophotography and reinforcing agent for said tone will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-661009