JPS5895747A - Film for electrophotography - Google Patents

Abstract

PURPOSE:To improve the solvent resistance and the heat resistance of a titled film, by using a oriented polyester film as a substrate and providing a specified toner receiving layer on the substrate. CONSTITUTION:A polymer film having the excellent heat resistance and transparency such as polyethylene terephthalate and polyethylene naphthalate is used as a substrate layer, and a toner receiving layer consisting of spherical plastic powder or a dispersion substance or inorg. fine particles and containing 0.05- 5wt% matting agent having 0.01-10mu average particle diameter and a binder resin insoluble in org. solvent such as a polyester resin, polyether resin and acrylic resin is formed on one side or both surface sides of the substrate layer. The surface specific resistant value of the toner receiving layer is adjusted so as to be in the range of 1X10<9>-1X10<15>OMEGA by incorporating an antistatic agent in the toner receiving layer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrophotographic film. For more details,
A polyester oriented film is used as a base material and L-1 A predetermined amount of matting agent and a resin layer serving as a specific binder are coated on at least one surface of this base film so that the surface resistivity value is 1 x 10°. An electrophotographic film with a toner-receiving layer in the range from Also relates to excellent electrophotographic films.

Conventionally, plastic films such as polyester films, polysulfone films, cellulose ester films, HolJCar 1'$-) films, etc. have been used as transfer machines for electrophotography. In order to prevent misfeeds and double feeds of the film during copying, to prevent image distortion due to charging, to prevent dust from adhering to transfer paper, and to improve writing properties, the film is coated with a matting agent such as an inorganic compound. Many are coated on the surface. However, since conventional matte films contain large amounts of matting agents, they are opaque or have low transparency, and require transparency such as films for overhead groggimetry using electrophotography or films for X-rays. It could not be used for any purpose.

Therefore, as a method to maintain transparency and improve conveyance (misfeed/double feed), 1iji* density, and interlayer adhesion between toner and base film, we have developed an organic solvent-soluble binder resin and a relatively small amount of A technique has been proposed in which a composition comprising a matting agent and subjected to antistatic treatment is provided as a toner receiving layer on at least one surface of a base film.

Apart from anything else, recent advances in electronic copying machines have been remarkable.
Extremely high-speed copying is being put into practical use, and due to the demand for high-speed copying, there is a natural tendency for the toner fixation temperature during copying to be set at a high temperature.

By the way, electrophotographic films can also be used as they are for overhead glosis films, X-ray films, and the like. When used in this field, it has become necessary to have solvent resistance in addition to the above-mentioned properties as an electrophotographic film.

For example, when a copied film is corrected, a solvent is used, so the film used needs to be resistant to solvents.

In other words, the electrophotographic film has a transportability of 1 image density,
It is desirable that the toner has excellent adhesion (adhesiveness), etc., as well as solvent resistance and heat resistance.

From this point of view, the conventionally proposed methods use a solvent-soluble resin as the binder resin, so the film provided with the toner receiving layer does not have solvent resistance.
For example, when an erasing liquid is used to correct an image, it has the disadvantage that the image becomes extremely messy.

The present invention solves these problems and provides a piezoelectric photographic film. When a plastic film is used as a base material and a toner receiving layer is formed on this base material, it has better solvent resistance and heat resistance than K, eliminates misfeeds during copying, has high image density, and can easily absorb both base film and toner. The object of the present invention is to provide an electrophotographic film that also has excellent adhesion to.

That is, in the present invention, a film of an organic polymer is used as a base material layer (base film), and a matting agent with a particle size of 0, 1μ (micron) to 10/J is provided on one or both surfaces of the base material layer. .05% by weight to 5% by weight and a binder resin mainly composed of polyester resin insoluble in organic solvents and/or acrylic resin, and the surface specific resistance of the toner receiving layer is The value is I x 10
It is an electrophotographic film in the range of @Ω to I x 10'-.

In the electrophotographic film according to the present invention, a toner receiving layer containing a resin and a matting agent and having a surface resistivity in the range of I x 10' to I x 10''Q is provided on both surfaces of the base film. It is convenient because it has excellent transportability and there is no need to distinguish between the copying surface and the non-copying surface during use. However, it is also possible to have a toner receiving layer on one surface of the base film.However, in this case It is preferable to provide an antistatic layer on the opposite side to which the toner receiving layer is provided.

Examples of base films made of organic polymers that can be used in the present invention include polyethylene terephthalate and polyethylene terephthalate.
V nonaphthalate, Go's polyester film, polycarbonate film.

Cellulose acetate film, polysulfone film, polyphenylene oxide film, polyimide film, polyamide film.

Polymer films with excellent heat resistance and transparency, such as, are suitable. In particular, thermoplastic aromatic polyesters such as polyethylene terephthalate and polyethylene naphthalate are preferably used.

In the case of polyester film, it has a high degree of dimensional stability as a base material, such as heat shrinkage rate (JISC-23
18) is preferably 1.5 inches or less in both the vertical and horizontal directions, and particularly preferably 1.0 inches or less.

As mentioned above, heat fixing during copying is carried out at a relatively high temperature in the range of 180 to 200°C, so if a film with poor heat resistance is copied using a dry electrophotographic copying machine, the surface flatness of the film will be lost. It has little practicality.

The paste film applicable to the present invention may contain additives such as colorants and lubricants as long as the performance as an electrophotographic film is not impaired. It is well known that films used as X-ray films are colored blue, and this type of film can also be applied to the substrate of the present invention.

The matting agents used in the present invention include inorganic fine particles such as mori, silicon dioxide, calcium carbonate, Merck, clay, etc., polyethylene, and polypropylene.

Polymer powders, suspensions, and dispersions of polyacrylonitrile, polystyrene, polyvinyl chloride, polycarbonate, polyethylene terephthalate, etc. are used. In particular, spherical plastic powder or dispersion bodies are preferably used. A matting agent having an average fine particle diameter (primary particle diameter) of 0.01 μ to lθμ can be used, and the particle diameter of the paper matting agent can be appropriately selected depending on the thickness K of the toner receiving layer. However, if the particle size of the matting agent is less than 0.01 μm, the slipperiness of the film will be poor and problems such as misfeed from the paper feed tray and double feeding during copying will easily occur. On the other hand, if it exceeds 1Oμ, the surface of the film becomes rough, and the slipperiness of the film decreases, making troubles more likely to occur, as in the case of 0.01μ, and the sharpness of the copied image is impaired. The amount of the matting agent added is suitably 0.01% to 5% by weight, particularly preferably 0.1% to 2% by weight, based on the binder resin. If the amount of the matting agent added is less than 0.01% by weight, the slipperiness between the films will be low and misfeeding or double feeding troubles will easily occur during copying. Further, if the weight exceeds 5 -, transparency is impaired and the film is not suitable for overhead projection films, X-ray films, etc.

Examples of binder resin components insoluble in organic solvents that can be applied to the present invention include polystell resins, polyether ester resins, and acrylic ester copolymers, methacrylic ester copolymers, and acrylic styrene copolymers. Examples of acrylic resins containing 30 mol 4 or more of an acrylic monomer component include at least im. These binder resins can be used as water-soluble, emulsifiable or water-dispersible. Examples of resins insolubilized in organic solvents include polyester resins, polyether ester resins, acrylic ester resins, methacrylic ester resins, copolymers of styrene and acrylic esters, and copolymers of styrene and methacrylic esters. , self-crosslinking or crosslinking between different polymers of an acrylic resin containing 30 (2) l or more of acrylic monomers such as acrylic polyols, etc.
Including those obtained from Furthermore, polyester resin and (
Or) an insolubilized resin can also be obtained by reacting an acrylic resin with an isocyanate compound, an aono resin, an epoxy resin, a phenolic resin, or the like. Examples of such isocyanate compounds include 1. tolylene diisocyanate), P,P'-diphenylmethane diisocyanate,
Xylene diisocyanate.

Examples include hexamethylene diisocyanate '9.

As the epoxy resin, glycidyl ethers of polyhydroxy compounds, glycidyl esters of polycarboxylic acids, etc. can be used. Examples of amino resins include methylolated amino compounds obtained by reacting amino compounds such as melamine, guanaquin, benzoguanamine, and urea with formaldehyde, and methylated or butylated methylolated amino compounds with alcohols such as methanol and butanol. Nine-methylolated amino compounds.

Alternatively, these initial condensates etc. can be applied.

As the phenol resin, a well-known resol type phenol resin or the like can be used. Among these insolubilized polyester resins and/or acrylic resins,
Particularly preferred are isocyanate compounds, melamine resins, and epoxy resins. Polyesters, acrylic resins, isocyanate compounds, which contain resins insolubilized in organic solvents,
The epoxy resin, amino resin, etc. may be provided in a form soluble in an organic solvent, or may be provided in the form of an aqueous emulsion or dispersion.

The surface resistivity value of the toner receiving layer is suitably in the range of I x 10''Ω to I x 10''Q. If the surface resistivity value is less than 1.times.10@-, the toner image will not be transferred sufficiently during copying, and the image e11 degrees on the transfer film will be low. On the other hand, if IX exceeds 10"Ω, the film becomes electrostatically charged and dust tends to adhere to it while handling the film, which often causes problems such as misfeeds and double feeds during copying. Moreover, the surface resistivity value is 1X10". If it exceeds 1Δ, the charges accumulated during copying will not be removed for a long time, causing mutual blocking of the films and causing problems in handling.

The surface specific resistance value of the toner receiving layer is from I
K may be adjusted to within the range of X 10''Ω by a known method, but an effective method is to use an alkyl phosphate ester salt as the antistatic agent.

Known salts such as alkyl sulfate salts and quaternary ammonium salts may be used.

The toner receiving layer contains the above matting agent and binder resin,
It consists of a composition that optionally contains an antistatic agent. Even more! Thermoplastic synthetic resin, natural resin 1 colorant, ultraviolet absorber, stabilizer, within the range that does not impair the performance of the child photographic film.
A lubricant, an antiblocking agent, a curing accelerator, etc. can also be added.

The electrophotographic film of the present invention can be obtained by coating at least one surface of the base film with a toner receiving layer.

The application of the toner-receiving layer is carried out using application mechanisms 2 which are known per se, such as air doctor coaters, bread coaters, rod coaters, etc.

This can be carried out by a known method using a squeeze coater 1, a reverse roll coater, or the like.

The electrophotographic film of the present invention has excellent transparency, solvent resistance, and heat resistance, and even when it is continuously copied using an electronic copying machine, it does not suffer from misfeeds or overlapping from the paper feed tray. This has the advantage that no transmission occurs. Furthermore, there is no image disturbance or transfer failure due to electrostatic disturbance, the resulting image is clear and has high density, and a transfer film with excellent adhesion to the toner receiving layer can be obtained.

This electrophotographic film is useful for a variety of applications, including overhead glosis applications and X-ray applications.

The present invention will be explained below with reference to Examples.

The surface resistivity values in Examples were measured 1 minute after energization using an insulation meter manufactured by Takeda Riken Co., Ltd. The sample for measurement was subjected to humidity control for 24 hours at a temperature of 23°C and a relative humidity of 65°C.

The softening point was measured by the ring and ball method (JIS-2531).

The molecular weight was measured by the vpo method.

Example 1 Water-soluble copolymerized polyester containing sodium sulfonate base (molecule -315000, softening point 140°C), water-soluble methylolmelamine, and crosslinking catalyst at a solid content ratio of 67
:30:3 aqueous solution 1 (10% by weight) (
To 10 parts, 0.1 part of calcium carbonate having an average particle diameter of 1 μm and 015 parts of dioctyl phosphate triethanolamine salt (antistatic agent) were added and uniformly dispersed. This aqueous solution was applied to both surfaces of a polyethylene terephthalate biaxially oriented film with a thickness of 100μ using a percoater so that the coating thickness was 1μ in an undried state, and heated to 130°C.
The film was heat-treated with hot air for 3 minutes to obtain an electrophotographic film with good transparency and a surface resistivity of I x 10''.The electrophotographic film thus obtained did not contain toluene. Even when lightly rubbed with gauze, no change was observed; the film has excellent solvent resistance.

there were.

When we made 50 continuous copies of electrophotographic film using a high-speed copying machine, there were no problems with dead feed or double feeding, and the resulting copy film had no problems with the toner-receiving layer coating and the image quality. There was no disturbance and the image density was high. The fact that the toner that has adhered to the copying layer is completely adhered to the toner receiving layer means that the toner surface is covered with cello.
・When an adhesive strength test was conducted by peeling off the tape after adhesion, only a slight amount of toner was observed to fall off.

Comparative Example 1 Methyl ethyl ketone/ethyl acetate/toluene = 1/
Copolymerized polyester [molecular weight 15,000. 10% by weight solution Zo with a softening point of 165°C]
Part o contains 0.1 part of calcium carbonate with an average particle size of 1 μm and 0.0 part of potassium dioctyl phosphate (antistatic agent). I 5
parts were added and uniformly dispersed.

Using this solution, a film having a surface resistivity of 2 x 10'' was obtained in the same manner as in Example 1.

When this film was lightly rubbed with gauze containing toluene, the coating layer (toner receiving layer) was easily separated, indicating that the film had poor solvent resistance.

Example 2 Water-soluble copolymerized polyester containing sulfone 1pNa base (molecular weight soooo, softening point 140°C), water-based acrylic-styrene copolymer, water-soluble methylolmelamine, and crosslinking catalyst in solid content ratio 0.05 part of silicon dioxide having an average particle size L5/j and 0.10 part of dioctyl potassium phosphate were added to 1'OO part of a 10% by weight aqueous solution containing a ratio of 55:15:3023. The silica was well dispersed. Using an aqueous solution, a surface resistivity value of 2X with good transparency was obtained by the same method as in Example 1.
A film for electronic military use of 10''Ω was obtained.

This electrophotographic film showed no change even when lightly rubbed with toluene-containing gauze, and was a film with excellent solvent resistance. A sand copy test was conducted in the same manner as in Example 1, and as in Example 1, good copying results were obtained.

Example 3 A 1011f% solution containing an acrylic polyol with a hydroxyl value of 30 ayKOH/f and tolylene diincyanate in a solid content ratio of loo:ls (methyl ethyl ketone/ethyl acetate/toluene = 1/
0.05 parts of polyolefin powder having an average particle size of 3 μm and 0.5 parts of potassium dioctyl phosphate were added to 100 parts of a 1/1 mixed solvent, and the polyolefin powder was uniformly dispersed. Using this solution number, a surface specific resistance value of 5×1 with good transparency was obtained by the same method as in Example 1.
An electrophotographic film of 61'lΩ was obtained. Even when this electrophotographic film was rubbed with gauze containing toluene, no change was observed, indicating that the film had excellent solvent resistance. In addition! l! A copying test conducted in the same manner as in Example 1 also yielded satisfactory results.

Example 4 0.015 parts of polyacrylonitrile powder with an average particle size of 5 μm and dioctyl phosphate monomer were added to 100 parts of a 5% aqueous solution of a water-soluble copolymerized polyester containing sulfonic acid N and base (molecular weight 10,000, softening point 170°C). 0.04 part of ethanolamine salt was added to uniformly disperse the polyacrylonitrile powder in the aqueous solution. The solution was applied in the same manner as in Example 1 to obtain an electrophotographic film with good transparency and a surface resistivity of I x 10"Ω. This electrophotographic film was coated with toluene-containing gauze. No change was observed even when rubbed with water, and the film had excellent solvent resistance.

A copying test was carried out in the same manner as in Example 1, and satisfactory results were obtained.

Claims (1)

[Claims] A binder resin containing matting agent particles is coated on the base material layer of the polymer film and one or both surfaces of the base material layer, and the specific resistance value is determined from I x 10"Ω to t.
In an electrophotographic film consisting of a toner receiving layer of As a component, the matting agent particles are 0.01μ (micron) to 10μ
1. An electrophotographic film comprising a toner receiving layer having a particle size of 1% to 5% by weight (relative to the binder resin) dispersed in osJij.