JPH0362042A - Electrophotographic transfer paper - Google Patents

Abstract

PURPOSE:To improve storage stability and traveling property and to form a superior transferred image without abrading the surface of a photosensitive body by incorporating calcium carbonate as a filler and an alkenylsuccinic anhydride as a size. CONSTITUTION:This transfer paper contains calcium carbonate as a filler and alkenylsuccinic anhydride as a size and has a pH of >=7.0, and it is used for an electrophotographic copying machine provided with a positively chargeable organic photosensitive body. When conventional rosin is used as the size, it chemically reacts with calcium carbonate, and the transfer paper is made liable to deteriorate, accordingly, it is preferred to use the alkenylsuccinic anhydride, and the use of the calcium carbonate as the filler reduces abrasion of the photosensitive body, as compared with the case of using talc, thus permitting storage stability and traveling performance and abrasion resistance to be improved of the surface of the photosensitive body, and superior transferred images to be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an electrophotographic transfer paper used in an electrophotographic apparatus.

(Prior art) Conventionally, electrophotographic transfer paper has a pH of 4.5 to 4.5 using talc as a filler and rosin as a sizing agent.
Papers below 6.5 (acidic papers) are widely used. This acidic paper has poor storage stability and deteriorates after a long period of time.

Therefore, in recent years, in place of this acidic paper, neutral paper with good storage stability using alkyl ketene dimer or the like as a sizing agent has come to be used. However, such neutral paper has poor runnability and is prone to paper jams, double feeding, etc.

Furthermore, when an electrostatic latent image formed on the photoreceptor of an electrophotographic device is developed with a developer and then transferred to electrophotographic transfer paper, if this photoreceptor is a positive polarity photoreceptor, the transfer paper is When it comes into contact with the photoreceptor, paper dust from the transfer paper may adhere to the photoreceptor. This paper dust abrades the surface of the photoreceptor. As a result, image deterioration such as black streaks occurs in the transferred image.

In particular, in the case of a positive polarity organic photoreceptor, as shown in Figure 1,
First, a charge transport layer (CTL) 3 is formed on an aluminum substrate 4, and a charge generation layer (CGL) 2 is formed thereon as a surface layer of the photoreceptor. Since the CGL is considerably thinner than the CTL, this wear of the CGL prevents charge generation and adversely affects the electrostatic latent image. In the case of a negative polarity hexaphotoreceptor, since the CGL and CTL are formed opposite to the positive polarity, the influence of wear is less than that of a positive polarity organic photoreceptor.

(Problems to be Solved by the Invention) An object of the present invention is to provide an electrophotographic transfer paper that has good storage stability and runnability, and is capable of forming an excellent transferred image without abrading the surface of a photoreceptor. With the goal.

(Structure of the Invention) In order to solve the above-mentioned problems, the present invention selects calcium carbonate as a filler to be used in transfer paper, and uses calcium carbonate alone or talc (3Mg0.4SiO).

H2O).

The transfer paper of the present invention is used in an electrophotographic copying machine equipped with a positive polarity organic photoreceptor, and contains calcium carbonate as a filler and alkenylsuccinic anhydride as a sizing agent.
It is an electrophotographic transfer paper with a rating of 7.0 or higher. If conventional rosin is used as a sizing agent, it will chemically react with calcium carbonate and cause the transfer paper to deteriorate, so alkenylconocarbon acid anhydrides, which do not chemically react with calcium carbonate, are optimal.

Another transfer paper of the present invention is an electrophotographic transfer paper having a pH of 7.0 or higher and containing calcium carbonate and talc as fillers. The filler usually accounts for the total weight of the transfer paper.
Contains 5-15% of melon. The preferred content of talc in the total filler is 5 to 30% by weight, the balance being 95 to 7% by weight.
0% by weight is the preferred content of calcium carbonate.

(Function) By using calcium carbonate as a filler for transfer paper, wear on the photoreceptor is reduced compared to when talc is used. In addition, by using alkenylsuccinic anhydride as a sizing agent, paper jams and double feeding are reduced.
Improves running performance.

Furthermore, if talc is used as a filler in addition to calcium carbonate, the stiffness of the paper will increase and the curl height will decrease at room temperature and pressure, as well as in high temperature and humidity environments, resulting in poor runnability and poor post-transfer performance. Paper can be easily stored in the paper output tray.

(Example) EXAMPLES The present invention will be specifically explained below with reference to Examples.

The transfer paper of the present invention can be manufactured using a normal manufacturing method, for example, as follows.

Hardwood pulp is mainly used as the raw material pulp.

If necessary, 10 to 30% softwood pulp can be used. First, this raw material bulb is kraft-cooked with kraft-cooking liquid containing caustic soda, soda sulfide, and the like. Waste liquid is separated from the cooked pulp to obtain pulp fibers. Next, the pulp fibers, which have turned black due to cooking, are chlorinated, extracted with alkali, and then bleached by performing several stages of oxidation treatment. Furthermore, this pulp fiber is beaten.

Beating allows water to penetrate inside the fibers to make them soft enough, increase the surface area of the fibers, increase the number of bonding points with each other, cut fibers that are too long, and improve the formation of the paper. A suitable filler is added to the pulp fibers beaten in this way, a suitable sizing agent is added thereto and the mixture is stirred, and then a fixing agent is added to fix the filler. Thereafter, the pulp fibers to which the filler has been added are subjected to dehydration, pressing, drying, surface treatment, etc. to form paper, thereby obtaining transfer paper. Note that, in the case of transfer paper, the amount of silica is usually added in an amount of 5 to 15% by weight.

Examples 1 to 3 Example 1 using the fillers and sizing agents shown in Table 1, respectively.
Transfer papers (A4 size) of Comparative Examples 1 to 3 and Comparative Examples 1 to 4 were manufactured.

Each of the produced transfer papers was attached to a positive polarity organic photoreceptor (hereinafter referred to as +O
set in an electrophotographic transfer device equipped with a computer (referred to as a PC),
10,000 sheets were passed through each sheet, and the drum abrasion and running properties were examined. The results are shown in Table 1 below.

In addition, as shown in FIG. 1, 100 PCs consist of a hydrazone charge transport agent represented by the following formula (1) and a phenoxy resin represented by the following formula (2) on an aluminum substrate 1. A charge transporting layer 2 containing a binder resin and an azo dye represented by the following formula (3), and the following formula (
1) A hydrazone-based charge transport agent represented by the following formula (
The charge generating layer 3 containing the binder resin represented by 2) is laminated.

As shown in Table 1, when talc is used as a filler,
The abrasion of the drum is high and ring streaks occur on transferred images, but when precipitated calcium carbonate is used, the drum abrasion is low and ring streaks do not occur.

Furthermore, when calcium carbonate is used as a filler, running properties will be poor if an alkyl ketene dimer is used as a sizing agent, but running properties will be good if alkenylsuccinic anhydride is used. Therefore, it can be seen that the best combination is to use calcium carbonate as a filler and alkenylsuccinic anhydride as a sizing agent.

Examples 4 to 6 Transfer papers of Examples 4 to 6 and Comparative Examples 4 to 7 were manufactured using the fillers shown in Table 2 below. This transfer paper was left in an environment of 30° C. and 85% humidity for 14 to 16 hours. after that,
The drum abrasion and runnability of each transfer paper were measured in Examples 1 to 2.
The investigation was conducted in the same manner as in 4. In addition, the stiffness and the height of the transfer paper lifted from the horizontal surface due to curling, that is, the curl height, were measured by placing five sheets of copied transfer paper stacked on a horizontal surface.

The results are shown in Table 2.

As shown in Table 2, the transfer papers of Examples 4 to 6 using calcium carbonate and talc as fillers had high stiffness, good drum abrasion resistance, small curl height, and
Good running performance. However, the transfer papers of Comparative Examples 5 and 6 in which only calcium carbonate was used had good drum abrasion resistance, but had a large curl height and poor runnability.
The transfer paper of Comparative Example 7 in which only talc was used had a small curl height and good running properties, but poor drum abrasion resistance.

[Effects of the Invention] As explained above, according to the present invention, by using calcium carbonate as a filler and alkenyl succinic anhydride as a sizing agent, or by using calcium carbonate and talc as a filler, preservation is possible. Thus, it is possible to obtain an electrophotographic transfer paper that has good properties in terms of durability, runnability, and abrasion resistance of the photoreceptor surface, and can form excellent transferred images. In particular, when calcium carbonate is used as a filler, the W! The corrosion resistance is improved and the occurrence of black streaks can be prevented. Further, transfer paper using calcium carbonate and talc has a small curl height and high rigidity even in a high temperature and high humidity environment.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a positive polarity organic photoreceptor. DESCRIPTION OF SYMBOLS 1... Aluminum substrate, 2... Charge transport layer, 3...
...1! l Load generation layer

Claims (2)

[Claims] (1) An electrophotographic transfer paper having a pH of 7.0 or higher and containing calcium carbonate as a filler and alkenylsuccinic anhydride as a sizing agent, which is used in an electrophotographic copying machine equipped with a positive polarity organic photoreceptor. (2) An electrophotographic transfer paper having a pH of 7.0 or higher and containing 5 to 30% by weight of calcium carbonate and talc based on the total filler.