JPS58117549A - Electrostatic image recording body - Google Patents

Abstract

PURPOSE:To eliminate the level differences on a surface to be formed with electrostatic images substantially by adhering both ends of a sheet-like electrostatic image recording body with a thermoplastic resin of >=0.5 optical density and making the level differences of the image forming surface at both ends of the recording body <=50mu. CONSTITUTION:A soln. prepd. by dispersing 5 parts silicon oxide uniformly in 100pts. a polyacrylic ester copolymer soln. of 20% solid concn. is coated as an electrostatic image forming layer 2 on a biaxially oriented polyester film 1 of 15mu whereby an electrostatic recording body coated with said layer at 5g/m<2> as a dry coating film is obtained. A material prepd. by dispersing 20pts. nigrosine as a coloring material uniformly in 100pts. polyacrylate resin is coated as an adhesive agent 3 on the end faces of such electrostatic image recording body whereby an endless electrostatic recording body is obtained. A xenon lamp is irradiated to the juncture of such recording body whereby the endless electrostatic image recording body connected by melting is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a so-called endless electrostatic image recording medium in which both ends of a sheet electrostatic image recording medium are attached with adhesive. More specifically, regarding electrostatic image recording bodies such as electrostatic recording bodies and electrophotographic recording bodies, in particular, after forming an electrostatic image on the electrostatic image recording body and transferring the electrostatic image or toner image to plain paper. The present invention relates to an electrostatic image recording medium for use as a transfer master for electrophotographic copying machines, facsimile machines, printers, etc., which uses plain paper as a hard copy base paper.

Conventionally, an electrostatic image recording medium based on a flexible plastic film has both ends. I was using it by inserting it inside the 4. However, in such recording media, the former creates a step in the overlapped area, and the latter creates a depression at the joint, so the subject and the printed material must be synchronized to prevent this area from being used. There was a drawback.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide an electrostatic image recording member in which the electrostatic image forming surface is substantially free of steps.

The present invention has the following configuration to achieve the above object.

That is, both ends of the sheet-like electrostatic image recording material have an optical density of 05.
The present invention is characterized by an electrostatic image recording body which is bonded with the above thermoplastic resin and has a step difference between the image forming surfaces at both ends of the recording body of 50 μm or less, preferably 20 μm or less.

The electrostatic image recording medium in the present invention refers to one that forms an electrostatic image ε and then forms a toner image P. To give a specific example, an electrostatic recording medium or an electrophotographic recording medium is used to form a toner image P on a lume. A layer of a conductive material or a photoconductor is added on top of the twisted or conductive substrate film with a conductive layer added thereto. Polyester polymers such as polybutylene terephthalate and polyethylene:y-2,6-naphthalene dicarpoxylate, polyolefins such as polyethylene and polypropylene, polyamides such as so-called nylon-6 and nylon-12,
A polyimide with a five-membered ring imide bond in the polymer main chain.

Cellulose m conductors such as cellulose esters, polystyrene, polycarbonate, polysulfone.

Acrylic ester copolymer, methacrylic ester copolymer, polyvinyl chloride, polyether.

In addition to polyester ether, films made of these copolymers or blends.

Particularly preferred is biaxially oriented polyethylene terephthalate film. The thickness of flexible plastic film is
The thickness is preferably 5 to 200μ, and if it is thinner than 5μ, wrinkles are likely to occur and workability is poor. Moreover, if it is thicker than 200μ, the flexibility will be reduced and it will lack practicality. Number 4. The conductive layer, dielectric material, and photoconductor are not particularly limited as long as they are each commonly known.9 For example, they may be appropriately selected from the following.

Conductive layer; gold, silver, copper, platinum, palladium, tin.

Metals such as aluminum and nickel bodies, their alloys, metal oxides, including polymer electrolytes.

Dielectric; thermoplastic resin such as polyester.

Polyesteramide, polyvinyl acetal, polyvinyl chloride, poly(meth)acrylate, nylon, polyurethane, polycarbonate, polystyrene, and copolymers of these.

Thermosetting resins such as phenolic resins.

Melamine resin, organosilicon compound, poxy resin etc.

Photoconductor; inorganic photoconductor such as selenium, selenium alloy, cadmium sulfide, zinc oxide, amorphous silicon, polyvinyl carbazole, pyrazoline, oxadiazole.

organic photoconductors such as hydrazine, etc.

The thermoplastic resin having an optical density of 0.5 or more in the present invention is a thermoplastic resin to which a coloring substance is added.

Examples of thermoplastic resins include polyester.

Polyesteramide, polyvinyl acetal, polyvinyl chloride, polyacrylic ester, polymethacrylic ester, nylon, polyurethane.

Examples include polycarbonate, polyvinyl acetate, and copolymers thereof. Polyolefins such as polyethylene and polypropylene are not preferred because they have poor adhesiveness and flexibility.

The coloring substance is not particularly limited as long as it can be mixed and dissolved or dispersed with the thermoplastic resin to have an optical density of 05 or more. For example, carbon black, nigrosine, spirit black, aniso2 black, ultramarine, navy blue,
Examples include phthalocyanine pigments.

The amount of the coloring substance added to the thermoplastic resin varies depending on each coloring substance and the thickness of the adhesive layer.1For example, when using carbon black and the thickness of the adhesive layer is 10μ or more,
It is necessary that the amount is 0.2 parts by weight or more based on 100 parts by weight of the thermoplastic resin.Furthermore, when using the adhesive layer imparted with conductivity in the present invention,
Even after repeated use, the charge does not accumulate in the connections and flows to the ground, so there is no toner adhesion, resulting in a high-quality, virtually continuous image, and the adhesive layer is conductive. It is desirable to do so.

In this case, the electrical conductivity of the adhesive is preferably an electrical resistance of 1 10 Ω-■ or less, and for this purpose, for example, in the case of carbon black, it is sufficient to add 1 part by weight or more to 100 parts by weight of the thermoplastic resin. . Of course, if the colored substance itself does not have conductivity, another conductive substance 1, such as one appropriately selected from the above-mentioned conductive layer forming materials, may be added.

Note that the optical density refers to a value expressed by the 9th order equation.

00 1) = /! Og□ D=Optical Density T: Light Transmittance (%) If the optical density is less than 05, the adhesive strength is so low that it is practically unusable.

In the present invention, the electrostatic image forming surfaces are bonded so that the step difference is 50 μm or more.

For this adhesion, Fig. 2 (1) is optimal, but (1)
The width d of the adhesive layer varies depending on the thickness of the electrostatic image recording medium, but is preferably 5 to 500 μm, more preferably 10 to 20 μm.
It is 0μ. If necessary, an adhesive can be provided on the opposite side of the electrostatic image forming surface as shown in FIG. 2 (2), and this is preferable because it further increases mechanical strength and improves durability.

Furthermore, if the thickness of the electrostatic image recording material is thin (9), for example less than 50μ, preferably less than 20μ, adhesive may be applied to both ends of the electrostatic image recording material as shown in (3) in Figure 2. It may not exist. In addition.

If it is thin like this, the ends may be overlapped and bonded as shown in FIG.

In the present invention, the ends of an electrostatic image recording medium are adhered in one or more ways to form an endless shape.

The method for manufacturing the electrostatic image recording medium of the present invention will be explained. In the present invention, a method of forming a notebook-like adhesive using the above-mentioned adhesive is preferably used.

An example is shown in FIG. FIG. 4 (As shown in 11, attach a sheet-shaped electrostatic image recording material with an auxiliary film 9 interposed, remove only the upper cut portion of the electrostatic image recording material, and apply adhesive 3 to the edge of the electrostatic image recording material. (Fig. 4 (2)).

Next, the auxiliary film 9 and the lower cut portion of the cut electrostatic image recording member are removed and the ends of the electrostatic image recording member are brought together (FIG. 4 (3)). As shown in FIG.
The endless electrostatic image recording material of the present invention is manufactured by melting and connecting the two by using the emission energy of the instantaneous discharge lamps 8 arranged in close proximity to each other. However, it is preferable to use the condensing lens 6 with the connection portion pressed down.

Furthermore, since a suction roll is used, there is no misalignment or overlap between the connecting parts.

As described above, the present invention provides an endless electrostatic image recording medium in which both ends of a sheet-shaped electrostatic image recording medium are connected to each other using a thermoplastic resin having an optical density of 05 or more as an adhesive. The height difference on the electrostatic image forming surface is 510μ or less,
Preferably 20μ or less.

It is preferably 10 or less, that is, by substantially eliminating steps and making the connecting portion sufficiently narrow, it is possible to continuously record electrostatic images.Furthermore, conductivity is imparted. When using a bonded adhesive, even after repeated use, the charge does not accumulate in the connection and flows to the ground, so toner does not stick to it, and when it is turned into a toner image, it produces a substantially high-quality, continuous image. can get.

Examples will be described below, but the present invention is not limited thereto. Similarly, all the blended parts in the examples are the flap parts.

Example 1 5 parts of silicon oxide was uniformly added to 100 parts of a polyacrylate copolymer solution with a solid content concentration of 20% as an electrostatic image forming layer on a 15μ biaxially stretched polyester film (Toshi "Lumirror"). An electrostatic image recording material was obtained by coating 5 gJp m' of the dispersed material as a dry coating film.

100 parts of polyacrylic acid ester resin as an adhesive and 2 parts of nigrosine as a coloring material were applied to the end face of this electrostatic image recording material.
An endless electrostatic image recording material as shown in FIG. 2 (1) was obtained by coating a material in which 0 part was uniformly dispersed.

The connecting portion of the endless electrostatic image recording medium was irradiated with a commercially available Xenon Lamps light source (2800 W/sec) to obtain an endless electrostatic image recording medium of the present invention which was melt-connected.

When the tensile strength of the connecting portion of the electrostatic image recording material was measured using Tensilon, it showed an adhesive strength of 1 kg/crn.

It was found to be sufficiently durable for practical use.

Comparative Example 1 An endless electrostatic image recording material was obtained in the same manner as in Example 1 except that only a polyacrylic acid ester resin was used as an adhesive without adding any coloring substance.

When the tensile strength of the connecting portion of the electrostatic image recording material was measured using Tensilon, it was very weak, 0.1 y/■, and could not be put to practical use.

Example 2 Platinum was sputtered onto a 100μ biaxially stretched polyester film (Toshi “Lumirror”) to give a surface resistance value of 5×.
A conductive film of 10 Ω/hole was obtained.

As an electrostatic imaging layer on top of the conductive film.

After a single layer of primer consisting of an acrylic acid ester copolymer was provided, 80 parts of a hydrolyzate obtained by hydrolyzing γ-glycidoxypropylmethyljethoxysilane with a 0.1N aqueous hydrochloric acid solution, 80 parts of Epicoat 82B ( Shell Chemical Epoxy Compound) 50 parts.

Acetylacetone A/10 parts of salt, 20 parts of silicon oxide, isopropyl alcohol/n-butanol/toluene.
10 g 7'm' as a dry film of paint prepared with a 2/1/1 mixed solvent so that the solid content concentration is 60%
A coated electrostatic image recording medium was obtained.

Carbon black (electrical resistance 02
5Ω-■, measuring pressure 50 bags/■2) 7 parts were mixed and uniformly dispersed and coated to obtain an endless electrostatic image recording member connected as shown in FIG. 2 (2).

The electrostatic image recording member was irradiated with a xenon lamp and connected in the same manner as in Example 1 to obtain an electrostatic image recording member of the present invention.

When the tensile strength of the connecting portion of the electrostatic image recording material was measured using Tensilon, it showed an adhesive strength of 3 kg/an.

Also, using the obtained electrostatic image recording material of the present invention.

When the electrostatic image recording - toner development - transfer - cleaning - static elimination process was repeatedly evaluated under the conditions of a tensile tension of 5 y/go, no toner adhesion was observed on the connection parts even after 10,000 repeated uses, and the result was unchanged from the initial stage. A good image was obtained, and no abnormality was observed in the connected portion, indicating that the connection strength was sufficient for practical use.

When the width of the connecting portion was measured, it was found to be 50 μm, and a substantially continuous image of high quality was obtained. The images obtained in this way were visible to the naked eye in a continuous manner without any problems. However, when it was observed under magnification using an optical microscope, there was no toner image in the image area corresponding to this connection, and it was found to be white.

Comparative Example 2 An endless electrostatic image recording material was obtained in the same manner as in Example 2 except that no carbon black was added and only polyester resin was used as the adhesive.

The tensile strength of the connecting portion of the electrostatic image recording member was measured using Tensilon and was found to be 0.2 kg/an.

Further, when repeated evaluations were conducted in the same manner as in Example 2, toner adhered to the connection area from around the 10th repetition and line-shaped stains began to appear on the copies, degrading the image quality.After 100 repetitions, the connection area It was found that the wire had been cut off, so it could not be put to practical use.

Example 6 A 100μ biaxially oriented polyester film (Lumirror) K A conductive film was obtained in which 1000 angstroms of Al was vapor-deposited. Polyvinylcarbazole/trinitrofluorenone/polycarbonate resin at a mixing ratio of 50150/30 was obtained on this film. Dissolved in tetrahydrofuran so that the solid content concentration is 10 yen, and the dried coating film is 15 yen.
An electrostatic image recording material coated with a coating amount of 100 g/ml was obtained.

Both ends of the electrostatic recording material were adhered using the adhesive of Example 2. Furthermore, a film-like adhesive prepared by applying the adhesive of Example 2 at 5 g/m1 as a dry coating onto a 20μ biaxially stretched polyester film (Toshi "Lumirror") was applied to the connection area on the opposite side to the electrostatic image forming surface. 5=width, and irradiated with a xenon lamp in the same manner as in Example 1 to obtain an endless electrostatic image recording member of the present invention.

When the tensile strength of the connecting portion of the electrostatic image recording material was measured using Tensilon, it showed an adhesive strength of 5 kg/m.

The electrostatic image recording material according to the present invention was set in a commercially available electronic copying drum and used repeatedly.

Even after 5,000 repetitions, no abnormality was observed in the connection part.
Moreover, no toner adhesion was observed, and a good image was obtained, which was the same as the initial image.

An example of a method for manufacturing an electrostatic image recording medium will be shown. In the figure, 1
is a flexible plastic film, 2 is an electrostatic image forming layer, ′
5 is an adhesive, 4 is a drum, 5 is a porous suction roll, 6
is a condensing lens, and 7 is a reflecting mirror.

8 is an instantaneous discharge lamp, 9 is an auxiliary film, and d is the width of an adhesive layer.

;t4a (t) (2) (4)

Claims (1)

[Claims] (1) Both ends of the sheet-like electrostatic image recording material have an optical density of 0.
5. An electrostatic image recording member, which is bonded with a thermoplastic V-type resin as described above, and has a step difference of 50 μm or less between the image forming surfaces at both ends of the recording member.