JP2853783B2 - Image translucent transparent film and image forming method using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent film for supporting a toner image formed by an electrophotographic method or an electrostatic printing method, and more particularly to a transparent film used for an overhead projector (OHP) or a slide projector. And an image forming method for forming a color image on the transparent film.

[0002]

2. Description of the Related Art Conventionally, it has been generally practiced to form a monochromatic image on a transparent polyester film or the like by an electrophotographic apparatus, use the obtained image on an OHP or the like, and use it as a projected image.

In recent years, a full-color image has been formed using this electrophotographic apparatus, and there has been an increasing demand for a full-color image output on a transparent film for the projection image.

[0004]

However, when a transparent film having a smooth surface is used, the frictional resistance between the transparent film and various parts in contact with the transparent film becomes large on the conveyance path in the electrophotographic apparatus, and the inside of the apparatus becomes clogged. There's a problem.

Conventionally, the following are employed as means for solving such a problem. That is, a thin film made of a resin containing inorganic fine particles such as silicon dioxide, alumina, etc., or starch, etc. called a matting agent is formed on the surface of the transparent film as described above, and the dynamic friction resistance is reduced by the rough surface formed by these particles. This is a method of appropriately adjusting. The average diameter (average particle diameter) of the surface-roughened particles (matting agent particles) used at this time is usually about 0.2 to 20 μm, but the coarse particles having a large particle diameter sufficient to achieve a sufficient surface roughness. In the case of planarized particles, the rough surface strongly scatters the incident light, resulting in a decrease in the transparency of the transparent film. Moreover, in order to make the roughness uniform over the entire surface, it is necessary to increase the filling amount of the surface-roughened particles, which also results in a decrease in the light transmittance of the base film. . As a result, the projected image may be blurry,
When the projected image is a color image, there is a problem that the color tone tends to be gray as a whole.

An object of the present invention is to provide an image-permeable transparent film having a stable transport property in a transport path of an apparatus.

Another object of the present invention is to provide an image-transmitting transparent film having excellent color tone reproducibility of a projected image of an image to be formed.

It is still another object of the present invention to provide a method for forming a color image which is excellent in color tone reproducibility of a projected image of a formed image.

[0009]

The present invention is characterized by having a first transparent resin layer as a base film and a second transparent resin layer having a roughened surface whose surface can be smoothed by heating and pressing. This is an image-transparent transparent film. Further, the present invention fixes the image on the transparent film by a process of forming an image on the surface of the transparent film with a color toner powder having a binder resin compatible with the second transparent resin, and a heat and pressure treatment. And an image forming method for smoothing a rough surface of the second transparent resin layer.

According to the present invention, since the surface of the transparent film is roughened, the frictional resistance is reduced, thereby enabling stable conveyance in the conveyance path of the image forming apparatus. After fixing the toner image on the surface of the transparent film, the roughened surface of the transparent film is smoothed by heating and pressing, so that when the film of the present invention is filled in a projector such as an OHP, scattering of incident light occurs. Absent. As a result, the problem that the non-image portion, which should be originally white, is reproduced white, and the color image portion is mixed with gray, and the saturation and lightness are reduced.

[0011]

FIG. 1 is a schematic sectional view of an electrophotographic apparatus using a color image translucent transparent film of the present invention capable of forming a full-color image. In the figure, the apparatus is roughly classified into the following I, II and III systems: I) The apparatus main body 1 from one side (the right side in FIG. 1) of the apparatus main body 100.
The transfer material transport system I, II provided substantially over the center of the image transfer apparatus 100 is provided near the transfer drum 8 constituting the transfer material transport system I at the substantially center of the apparatus main body 100. Latent image forming section II, III) Developing means, that is, a rotary developing device III, which is disposed in close proximity to the latent image forming section II.

The above-mentioned transfer material transport system I
Transfer material supply trays 101 and 102 which are detachable from an opening formed on one side (right side in FIG. 1)
And paper feed rollers 103 and 104 disposed almost directly above the trays 101 and 102; and paper feed rollers 103 and 104 disposed near the feed rollers 103 and 104.
Paper feed guides 4A and 4B provided with the feed roller 6 and a contact roller 7, a gripper 6, and a transfer material separation near the outer peripheral surface from the upstream side to the downstream side in the rotational direction near the outer peripheral surface. A charging device 12 and a separating claw 14 are provided, and a transfer charger 9 and a transfer material separating charger 1 are provided on the inner peripheral side.
1, a transfer drum 8 rotatable in the direction of the arrow in FIG. 1, a transfer belt means 15 provided close to the separating claw 14, and a transfer belt means 15 near the end of the transfer direction in the transfer direction. The discharge tray 17 extends outside the apparatus main body 100 and is detachable from the apparatus main body 100.
And a fixing device 16 which is close to the fixing device 16.

The latent image forming section II has an outer peripheral surface in contact with the outer peripheral surface of the transfer drum 8 and is rotatable in the direction of the arrow in FIG. The charge removing charger 10, the cleaning unit 11, the primary charger 3, and the photosensitive drum 2, which are disposed near the outer peripheral surface of the body drum 2 from the upstream side to the downstream side in the rotation direction of the photosensitive drum 2. An image exposure means such as a laser beam scanner for forming an electrostatic latent image on the outer periphery and an image exposure reflection means such as a polygon mirror are provided. The rotary developing device III is mounted on a rotatable housing (hereinafter, referred to as a “rotary body”) 4 a and the rotary body 4 a, respectively, and is provided at a position facing the outer peripheral surface of the photosensitive drum 2. Has a yellow developing unit 4Y, a magenta developing unit 4M, a cyan developing unit 4C, and a black developing unit 4BK for visualizing (that is, developing) the electrostatic latent image formed on the outer peripheral surface of the image forming apparatus.

First, the sequence of the entire image forming apparatus having the above-described configuration will be briefly described by taking a full color mode as an example.

When the photosensitive drum 2 rotates in the direction of the arrow in FIG. 1, the photosensitive member on the photosensitive drum 2 is uniformly charged by the primary charger 3. By the primary charger 3,
When the photosensitive member is uniformly charged, the laser beam E modulated by a yellow image signal of a document (not shown)
Image exposure is performed, and an electrostatic latent image is formed on the photosensitive drum 2. With the rotation of the rotator 4a, the development of the electrostatic latent image is performed by the yellow developing device 4Y fixed at the developing position in advance.

On the other hand, the paper feed guide 4A and the paper feed roller 10
6. Next, the transfer material conveyed via the paper feed guide 4B is held by the gripper 6 at a predetermined timing.
The transfer roller 8 is electrostatically wound around the contact roller 7 and the electrode facing the contact roller 7. The transfer drum 8 rotates in the direction of the arrow in FIG. 1 in synchronization with the photoconductor drum 2, and the developed image developed by the yellow developing device 4 </ b> Y has the outer peripheral surface of the photoconductor drum 2 and the outer peripheral surface of the transfer drum 8. Is transferred by the transfer charger 9 at the portion where it contacts. The transfer drum 8 continues to rotate as it is,
Prepare for transfer of the next color (magenta in FIG. 1).

On the other hand, the photoreceptor drum 2 is discharged by the discharging charger 10 and cleaned by the cleaning means 11, and then charged again by the primary charging device 3, and the above image exposure is performed by the next magenta image signal. Receive. The rotary developing device rotates while an electrostatic latent image based on a magenta image signal is formed on the photosensitive drum 2 as a result of the image exposure.
Is positioned at the above-described predetermined developing position, and predetermined magenta development is performed. In succession, the above-described processes are also performed for cyan and black, respectively, and when the transfer for four colors is completed, the four-color visual image formed on the transfer material is discharged by each of the chargers 10 and 13, and While the gripping of the transfer material by the gripper 6 is released, the transfer material is separated from the transfer drum 8 by the separation claw 14, sent to the fixing device 16 by the transport belt 15, and fixed by heat and pressure to form a series of full-color images. The print sequence ends.

As a result, a required full-color print image is formed.

Next, the toner powder used in the electrophotographic apparatus will be described.

As the toner powder for a color electrophotographic apparatus,
It is preferable to use a so-called sharp melt toner. The reason is that the toner needs to be excellent in meltability and color mixing when heat is applied. That is, the sharp melt toner melts at a low softening point in a short time.

Further, another advantage of using a toner having a sharp-melting property is that the color reproduction range of a copy can be expanded and a color copy faithful to a multicolor image of a document can be obtained.

Such a sharp-melt toner is, for example, pulverized after melt-kneading a colorant (dye, sublimable dye), a charge control agent and the like into a binder resin such as a polyester resin or a styrene-acrylic resin. Classify and manufacture.
If necessary, an external addition step of adding various external additives to the toner may be added.

As the color toner, those using a polyester resin as the binder resin are particularly preferable. Polyester resin is excellent in fixing property and sharp melt property. The sharp-melt polyester resin can be synthesized by copolycondensation of a diol compound and a dicarboxylic acid, and is a polymer compound in which the main chain of the molecule is formed by an ester bond.

In particular,

[0025]

Embedded image (Wherein, R ¹ and R ² are each an ethylene or propylene group, and R ³ and R ⁴ are each at least one selected from a hydrogen atom and an alkyl group having 1 to 5 carbon atoms which may have a branch. And both may be the same, or may be mutually bonded to form a ring, wherein x and y are each 1
These are positive numbers, and the arithmetic mean of x + y is 2 to 2.
The polyester resin obtained by co-condensation polymerization of a bisphenol represented by the formula (10) and a polyvalent carboxylic acid component is preferred in that it has sharp melting properties.

As the diol component, besides bisphenols, one or more selected from derivatives and substituted products thereof can be used.

In addition to the free acid, one or more carboxylic acid components selected from acid anhydrides and lower alkyl esters thereof can be used.

Preferred diol components include bisphenol A, bisphenol F, 1,1-bis (4-oxyphenyl) ethane and 1,1-bis (4-oxyphenyl) cyclohexane.

Examples of the polycarboxylic acid component include fumaric acid, maleic acid, maleic anhydride, phthalic acid, terephthalic acid, trimellitic acid, and pyromellitic acid. Among them, terephthalic acid and isophthalic acid are preferred.

The softening point of the sharp-melting polyester resin is preferably selected from 75 to 150 ° C., preferably from 80 to 120 ° C. FIG. 2 shows the softening characteristics of the toner containing the sharp melt polyester resin as a binder resin.

Using a melt flowability measuring instrument [trade name: Flow Tester CET-500 type (manufactured by Shimadzu Corporation)], a die (nozzle) having a diameter of 0.2 mm and a thickness of 1.0 mm was used.
A plunger drop-temperature curve (hereinafter referred to as “softening”) of a toner drawn when the temperature is increased at a constant rate of 6 ° C./min after a preheating time of 300 seconds at an initial set temperature of 70 ° C. by applying an extrusion load of 0 kgf. S-shaped curve). The sample toner is precisely weighed from 1 to 3 g of fine powder, and the cross-sectional area of the plunger is 10 cm ² . The softening S-shaped curve has the shape shown in FIG. As the temperature rises at a constant speed, the toner is gradually heated,
Outflow is started (plunger descent A → B). When the temperature is further increased, the toner in a molten state flows out greatly (B
→ C → D), plunger descent stops and ends (D
→ E).

The height H of the S-shaped curve indicates the total amount of outflow, and H /
The temperature T ₀ corresponding to the C point 2 indicates the practical softening point of the toner.

This measuring method can be similarly applied to the measurement of the thermal melting characteristics of the binder resin or the resin itself for forming the second transparent resin layer.

With such a sharp-melting toner or resin, the temperature when the melt viscosity shows 10 ³ cps is T ₁ , and the temperature when the melt viscosity shows 5 × 10 ² cp is T ₂ , T ₁ = 90 to 150 ° C .; | ΔT | (= | T ₁ −T ₂ | = 5 to 20 ° C.)

The toner or resin having the temperature-melt viscosity characteristic (sharp melt property) is characterized in that the viscosity is reduced very sharply when heated. Such a decrease in viscosity causes a proper mixing of the uppermost toner layer and the lowermost toner layer, and also sharply increases the transparency of the toner layer itself. It is believed that it contributes to good subtractive mixing.

When such a toner is used, an image on a transfer material such as a normal paper is hardly affected by the image quality as long as it is visually observed. Since the image to be viewed is a reflection image of light radiated on the fixed image, it is difficult to perceive even if some granularity remains on the toner surface.

However, when observing an image with transmitted light, as in an OHP (overhead projector), an impression is given that light transmission is deteriorated due to light scattering caused by the residual shape of the toner particles. Therefore, the binder resin contained in the toner particles is preferably compatible with the second transparent resin of the transparent film.

FIG. 3B shows a typical structure of the transparent film according to the present invention.

Reference numeral 31 denotes a first transparent resin layer as a base film, which is significantly deformed by heating (usually 100 ° C. or higher) during fixing (evaluation according to ASTM D1637).
This is a heat-resistant resin film having a maximum operating temperature of 100 ° C. or higher without causing any heat generation. As the material, for example, polyethylene terephthalate (PET), polyamide (nylon), polyimide or the like is used. Among them, polyethylene terephthalate is particularly preferred in terms of heat resistance and transparency. It is necessary that the thickness of the first transparent resin layer 31 does not cause wrinkles even when softened by heating during fixing. In the case of the aforementioned materials, the thickness of the first transparent resin layer 31 may be 50 μm or more. Also, the first transparent resin layer 31
Is usually selected to be 200 μm or less, preferably 150 μm or less. This upper limit is a constraint that comes from suppressing a decrease in light transmittance caused by an increase in the thickness of the provisional transparent resin layer within a practically acceptable range.

Numeral 32 denotes an overcoat layer constituting the second transparent resin layer which is laminated in order to improve the translucency of the image after fixing. It is preferable that the material resin of the layer 32 be compatible with the binder resin contained in the toner for forming an image in a temperature range during heat fixing. Being compatible with the binder resin of the toner means that the resin of the layer 32 and the toner resin do not form a boundary in the image after fixing.

As a guideline for selecting the resin, the value of the solubility parameter (SP _R ) of the resin constituting the material of the layer 32 is within ± 1.5 around the value of the solubility parameter (SP _r ) of the toner resin, especially ± It is preferable to employ a resin belonging to the range of 1.0 or less. Resin solubility parameters are described in publications such as the Polymer Handbook. For example, when the above-described polyester resin is used as the binder resin for the toner, the solubility parameter (SP _r ) of the resin is about 11.0, and thus the layer 3
As a material resin of No. 2, the solubility parameter is 11.0.
Each resin within the range of ± 1.5, for example, polyester resin (PET), polymethyl methacrylate resin (PMM
A), epoxy resin without curing agent, polyurethane resin without curing agent, vinyl chloride resin (PVC), vinyl chloride
A thermoplastic resin such as a vinyl acetate copolymer can be used.

The storage modulus of the second transparent resin at 160 ° C. is 100 dye / cm ^{2 to} 10,000 dye.
/ Cm ² is preferred. The storage elastic modulus was measured by Dynamir Spectromete RDS7 manufactured by Rheometrics Inc.
It can be measured using the 700 series II. Layer 3
The thickness of the toner particles 2 varies depending on the toner particle size to be used. However, in order to sufficiently transmit a low density toner portion having only a thickness of about one toner particle as an image, the average value of the toner particle size is required. Is required to have a thickness of 1/2 or more. However, layer 3
When the film thickness of No. 2 is three times or more the toner particle size, the amount of the molten resin becomes too large, which not only causes blurring or distortion of the image, but also
Cracking of the layer 32 (image) due to bending also occurs. Therefore, the thickness of the layer 32 is preferably set in a range of not less than 1/2 and not more than twice the average value of the volume particle diameter of the toner.

In the present invention, the average particle size of the toner is a value measured by the following method.

An interface (manufactured by Nikkaki Co., Ltd.) for outputting a number distribution, a volume distribution, a number average and a volume average using a particle size measuring device [trade name: Coulter Counter TA-II type (manufactured by Coulter)] and a personal computer [ (Trade name: CX-1 (manufactured by Canon Inc.)), and an aqueous sodium chloride solution (concentration: 1% by weight) is prepared using sodium chloride (primary reagent) as an electrolytic solution.

As a measuring method, a surfactant is used as a dispersant in 100 to 150 ml of the electrolytic solution (aqueous saline solution),
Preferably, 0.1 to 5 ml of an alkylbenzene sulfonate substituted with an alkyl group having 10 to 18 carbon atoms is added, and 0.5 to 50 mg of a measurement sample, usually 2 to 2 mg is added.
Add 0 mg.

The electrolytic solution in which the sample was suspended was subjected to dispersion treatment for about 1 to 3 minutes using an ultrasonic disperser, and particles having a particle size of 2 to 40 μm were obtained using a 100 μm aperture as the aperture in the Coulter Counter TAII. The particle size distribution was measured, from which the volume average particle size was determined.

Reference numeral 35 denotes resin particles for making the surface of the layer 32 rough. As the resin particles, resin particles whose rough surface is smoothed by heating and pressing are used.

After a second transparent resin layer is formed on the heat-resistant first transparent resin layer 31 as shown in FIG. 3B, resin particles 35 for roughening the surface are applied to the surface. did.
The surface-roughened particles 35 used here are formed of a resin having compatibility with the second transparent resin and having thermoviscoelastic properties close to the resin in a fixing temperature region. Desirably, the resin particles are finely pulverized second transparent resin or binder resin particles contained in the toner particles.

The resin particles 35 are dispersed in a dry state on the surface of the second transparent resin layer, and after the dispersion is completed, methyl ethyl ketone,
A rough surface is formed by exposure in a vapor atmosphere of a solvent such as acetone or methanol. At the same time, binding to the second resin layer is provided.

However, when exposing in an atmosphere of solvent vapor, processing conditions such as solvent concentration and exposure time are used according to the resin and solvent used so that the surface roughness formed by the resin particles is not impaired. Must be set appropriately.

The method for preparing the transparent film of the present invention in which resin particles are provided is as follows. The layer 31 is coated with a volatile organic solvent comprising alcohols such as methanol and ethanol or ketones such as methyl ethyl ketone and acetone.
(2) A method of dissolving the resin for formation, applying by an appropriate application method such as a bar coating method, a dip coating method, a spray coating method or a spinner coating method, and then drying. In some cases, both the resin of the layer 31 and the resin of the layer 32 are compatible in order to increase the adhesion between the layer 32 and the layer 31 so that the image does not peel off during and after fixing. An adhesive layer 33 which has high heat resistance and is not easily melted by heating during fixing may be provided as necessary as shown in FIG.

Examples of resins that can be used as the adhesive layer include resins such as polyester resins, acrylate resins, methacrylate resins, styrene-acrylate copolymer resins, and styrene-methacrylate copolymer resins. No.

The average volume diameter of the resin particles 35 is 0.1 μm.
It is preferably from 10 μm to 10 μm, particularly preferably from 0.1 μm to 5 μm. If the particle size is too large, the granularity of the resin particles tends to remain even after the fixing of the toner image, and the underlayer (non-image area) becomes gray when a translucent image is formed. On the other hand, if the thickness is too small, the in-machine running property becomes equivalent to that of the non-roughened film, and as a result, phenomena such as film clogging are likely to occur.

The surface roughness of the rough surface formed by using the resin particles is expressed as an average roughness (R _Z ) by a ten-point method of 0.1 to 0.1.
It is preferable to perform the treatment so as to have a thickness of 10 μm, preferably 0.5 to 5 μm.

FIG. 3A shows a conventional matting particle 34 such as a conventional silicon dioxide, alumina, etc.
2 is a transparent film whose surface has been roughened by being included in the film. This transparent film has sufficient properties for in-machine running properties, but particles remain even after image fixing,
When this film is loaded into a projection device such as an OHP, scattering of incident light occurs. As a result, not only the non-image which should be white originally becomes gray, but also gray is mixed in the color image portion, and both the saturation and the brightness decrease.

The roughening of the surface of the second transparent resin layer is simply performed by
This may be done by polishing the surface. At this time, the degree of surface roughening is preferably 400 mesh to 3000 mesh, particularly preferably 400 mesh to 2500 mesh. The surface of the second transparent resin layer may be roughened by pressing the surface with a member having a large number of minute projections on the surface. Further, a method of spraying the resin melted by heating on the surface of the second transparent resin layer may be used.

In any case, the surface of the second transparent resin layer has a Heck smoothness (JIS P8119) of 80 to 1000 seconds, particularly preferably 200 to 800 seconds.

The rough surface of the second transparent resin layer is 20
Those which are smoothed by heating and pressing at 0 ° C. or lower, particularly 185 ° C. or lower are preferable.

Hereinafter, the present invention will be described with reference to examples.

Example 1 Biaxially stretched polyethylene terephthalate resin film (film thickness 100 μm, heat deformation temperature 1)
The polyester resin P1 [having a solubility parameter of about 1
1. Storage elastic modulus (G ') at 160 ° C. 1000 dy
ne / cm ² , a softening point of 116 ° C.) in acetone was applied by a bar coating method, and the film thickness after drying was 16
After forming a second transparent resin layer having a thickness of μm, the transparent film F1
I got

Further, 100 particles per 1 cm ^{2 of the} polyester resin P1 (average particle size: 5 μm) were applied to the surface of the second transparent resin layer by an electrostatic coating method, and then exposed to a methyl ethyl ketone vapor atmosphere to remove the particles. It was bound to the surface of the second transparent resin layer and roughened. The surface smoothness of the obtained transparent film was 600 seconds in Beck's smoothness.
No treatment was performed on the back surface of the transparent film. The obtained transparent film had the cross section of FIG. 3 (b).

The transparent film obtained as described above was cut into an A4 size, and several tens of the sheets were stacked, loaded into the cassette 102 of the image forming apparatus shown in FIG. 1, and subjected to a paper feed test. . The loading method was such that the roughened surface of the transparent film was on the lower side, and the back surface of the transparent film was in contact with the roughened surface.

Further, a feeding experiment was performed continuously for ten sheets. As a result, it was confirmed that the sheets were fed one by one without slippage due to the sheet feeding roller 103 and without generating double feeding. Similar experiments were repeated with similar results.

Next, the sharp melt polyester resin P
₂ [solubility parameter of about 11,160 storage modulus at ℃ (G ') 8dyne / cm 2, a softening point of 105 ° C., a temperature T ₁ is 123 ° C. indicating the apparent melt viscosity of 10 ³ poise,
5 × 10 temperature T ₂ showing the ² poise 131 ° C. and | T ₁ -
T ₂ | = 8 ° C.] A yellow toner was prepared using 100 parts by weight, 3.5 parts by weight of a yellow colorant and 4 parts by weight of a chromium-containing organic complex.

The property values of the yellow toner are as follows: a volume average particle diameter of 12 μm, a storage elastic modulus (G ′) at 160 ° C. of 10 dyne /
cm ^2, - softening point 107 ° C., (showing a 10 ³ poise apparent melt viscosity) and temperature T ₁ 1
25 ° C., temperature T ₂ (same as above, showing 5 × 10 ² poise) 134 ° C., || T ₁ −T ₂ | = 9 ° C .: indicates having sharp melt properties.

Using the image forming apparatus shown in FIG. 1 (the surface layer of the heat-fixing roller 161 is formed of silicone rubber, and the surface layer of the pressure roller 162 is formed of a fluororesin), and the resin-coated ferrite carrier has a weight of 100%. The toner image is uniformly formed so that the fixed image density becomes 1.5 (Macbeth reflection densitometer) using 4 parts by weight of a yellow toner externally added with 0.4 parts by weight of hydrophobic colloidal silica. Transferred to a laminate film. This yellow unfixed toner image is heated to a fixing roller temperature of 160.
° C, average heating time 25msec, pressure 3kgf / cm
^Under the conditions of ² , a heat and pressure fixing was performed by a heat and pressure fixing device equipped with a heat fixing roller [coated with dimethyl silicone oil (viscosity 100 cs) as a release agent]. The fixed yellow toner image formed on the transparent film F1 was observed.

As a result of the observation, the applied resin particles were dissolved in the second transparent resin layer 32 and had no adverse effect on the image. Also, the haze of the white portion of the translucent image is 8% before fixing.
Was 4% or less after fixing. This haze was equivalent to that of the film to which no resin particles were added from the beginning, and there was no adverse effect on the obtained yellow image.

[0068] obtained after (Comparative Example 1) Average particle diameter homogeneously kneaded by mixing matting particles of 17μm that the polyester resin P ₁ consisting silicon dioxide particles for the second transparent resin layer used in Example 1 The coating liquid was applied on the surface of the first transparent resin layer 31 by a bar coating method so that the resin film thickness became 14 μm.

The same transport test as in Example 1 and a transmission image test using OHP were performed.

In terms of transportability during feeding, the same results as in the case of using the transparent film of the example were obtained, but in the transmission image, first, the white portion was darkened by matted particles. Further, the yellow colored portion became ocher and the image was deteriorated due to the adverse effect of the matted particles.

(Example 2) The surface of the transparent film F1 shown in Example 1 was rubbed almost uniformly with a sandpaper having a roughness of No. 2000 so that the rough surface as shown in FIG. 2
It was formed on the surface of the transparent resin layer 32. The surface of the obtained transparent film was cloudy glass, and the haze was 10% or more.

A transport test similar to that of Example 1 was performed using this transparent film, and good results were obtained. Further, when an image was formed on the surface of the transparent film using the yellow toner described in Example 1, after passing through the fixing device, the rough surface on the transparent film almost disappeared, and the cloudiness of the non-image portion was reduced. Example 1 with less than 4% transmission image
The same good results as those described above were obtained.

[0073] (Example 3) by the glass Peas spherical diameter 40~50μm surface, using a stainless steel roller (roughness 2~3μm at R _Z) which substantially uniformly roughened, the roller Heat the surface to 110 ° C, and face it with a silicone rubber roller (5
A roller having a silicone rubber layer formed with a thickness of mm was arranged under pressure to prepare a pair.

Next, the transparent film F1 shown in Example 1 was used.
Is sandwiched between the pair of rollers, and the pair of rollers is further driven to rotate to convey the transparent film. Due to the pressure and heat applied at this time, a rough surface as shown in FIG.

Next, Example 2 was carried out using this transparent film.
When a transmission test similar to that of Example 2 and a transmission image test of an image obtained by forming a yellow image on a film were performed, the same results as in Example 2 were obtained.

(Example 4) A non-curable epoxy resin [solubility parameter value 10.5, softening point 114 ° C, 1 ° C] was applied to the surface of the second transparent resin layer of the transparent film F1 shown in Example 1.
Storage elastic modulus (G ′) at 60 ° C. 800 dyne / c
m ² , weight average molecular weight 20,000] was heated to 180 ° C. or higher to form a liquid having a viscosity of 10 ² poise, which was sprayed with an air spray. The surface of the obtained film is shown in FIG.
(E). Next, the same test as in Example 2 was performed using this film, and similar results were obtained.

(Example 5) Using the films of Examples 1 to 4, a full-color image was formed on the film using not only yellow but also magenta, cyan, and black toners, and the transmitted light transmission image was observed. As a result, no adverse effect due to the roughened particles was observed, and a good image equivalent to that containing no roughened particles was obtained.

[0078] (Example 6) a polyester resin, the temperature at sharp melt polyester resin P ₂ [solubility parameter (SP _R) about 11, a softening point of 105 ° C., the melt viscosity of T ₁ (apparent shows the 10 ³ poise ) 123 ° C, T ₂
(Temperature when showing 5 × 10 ² poise) 131 ° C., 160
Storage modulus (G ') at 8 ° C. 8 dyne / cm ² , |
T ₁ −T ₂ | = 8 ° C.]
μm fine powder (trade name: measured using the Coulter Counter TA-II type (manufactured by Coulter) by the method described above) was applied to the surface of the transparent film F1 prepared in Example 1 by the electrostatic coating method in an amount of about 1 cm ^2. It was applied so as to be distributed at a ratio of 100, and then exposed in an acetone vapor atmosphere to bind to the surface of the second transparent resin layer. The surface smoothness of the obtained transparent film was 800 seconds in Beck's smoothness. In addition, no treatment was performed on the back surface of the laminated film. The obtained roughened laminated film is shown in FIG.
Has the cross-sectional shape shown in FIG.

The transparent film obtained as described above was
Fig. 1
And a paper feed test was performed. In the loading method, the above-mentioned transparent film was placed such that the rough surface was on the lower side, and the back surface of each film was opposed to the rough surface.

Further, a paper feeding experiment was performed continuously for ten sheets. As a result, it was confirmed that the paper was fed one by one without causing any slippage due to the paper feeding roller 103 or generating a double feed. The same experiment was repeated several times with similar results.

Next, 100 parts by weight of the polyester resin (P ₂ ) used as the above-mentioned resin particles, and a yellow colorant.
A yellow toner was prepared using 5 parts by weight and 4 parts by weight of the chromium-containing organic complex. The property values of the yellow toner were as follows: volume average particle diameter 12 μm storage elastic modulus (G ′) at 160 ° C. 10 dyne /
cm ^2, · softening point 107 ° C., · temperature T ₁ (the melt viscosity of the apparent temperature shown the 10 ³ poise) 125 ° C., · temperature T ₂ (ibid temperature indicating the 5 × 10 ² poise) 134
° C. · | T ₁ -T ₂ | = 9 ° C., it was found to have sharp melt properties.

Using an image forming apparatus shown in FIG. 1 (the surface layer of the heat fixing roller 161 is formed of silicone rubber, and the surface layer of the pressure roller 162 is formed of a fluororesin), and a resin-coated ferrite carrier of 100 weight And a yellow toner image are uniformly formed so that the fixed image density becomes 1.5 (Macbeth reflection densitometer) using the toner image and the yellow toner 4 parts by weight (hydrophobic colloidal silica 0.4% by weight). And transferred to a transparent laminate film. The yellow unfixed toner image was hot-pressed and fixed by a heat-press fixing device.

In the fixing device, the temperature of the heat fixing roller was 160 ° C., the average heating time was 25 msec, and the pressing force was 3 kg.
Under a condition of f / cm ^2, the image was heated and fixed by a heat fixing roller [a dimethyl silicone oil having a viscosity of 100 cs was applied as a release agent]. The fixed yellow toner image formed on the transparent film F1 was observed.

As a result, the applied resin particles did not dissolve into the second transparent resin layer 32 and had no adverse effect on the image. Also, the haze of the white portion of the translucent image is 7% before fixing.
Was decreased to 4% or less after fixing, which was the same as or slightly inferior to the haze of the film to which the resin particles 35 were not initially applied. Moreover, no adverse effects such as black spots due to the resin particles were observed in the obtained yellow translucent image, and the obtained image had high chroma.

(Example 7) The resin P2 for toner powder also shown in Example 6 was heated to 150 ° C on the surface of the overcoat layer of the transparent laminated film F1 shown in Example 1 to obtain a low viscosity (viscosity 10 ²⁾ The poisoned liquid was sprayed with an air spray.

The resulting transparent film becomes a lotus leaf shape by the impact of minute resin particles on the film surface.
It was like the schematic diagram of (b). The surface roughness was 600 seconds in Beck smoothness.

Next, this film was treated with A as in Example 6.
The paper was cut into four sizes and subjected to a paper passing and paper feeding test. As a result, the film clogging rate was 0.001 or less, that is,
The paper jam was good, that is, no more than one paper jam in 000 sheets, and was equivalent to that of Example 6, and good feeding was possible.

Further, a magenta toner having a volume average particle diameter of 12 μm was prepared in the same manner as in Example 6, except that 1.9 parts by weight of the magenta colorant was used. The storage elastic modulus of this magenta toner at 160 ° C. is 8 dyn.
e / cm ² , its softening point was 106 ° C., and it had a sharp melt property.

Using this toner, a magenta solid image with an image density of 1.5 was transferred to the transparent film described above.
Established. As a result, no adverse effect due to the resin particles was observed in the translucent image, and a vivid translucent image was obtained without decreasing the saturation of magenta. Also, the haze of the translucent white portion was 10% before fixing, but decreased to 3% after fixing, which was almost equivalent to the value before the application of the resin particles of the transparent film F1. (Example 3) A roller made of corrosion-resistant steel (stainless steel) [the surface of which is coated with a fluororesin such as polytetrafluoroethylene (PTFE) to a thickness of 10 to 100 μm], and a roller (iron core) which rotates opposite to this roller (A silicone rubber layer having a thickness of 5 mm was formed on gold)), and a roller coated with a fluorine resin was heated to set its surface temperature to 130 ° C.

Next, the transparent film F1 shown in Example 1
Epoxy resin containing no curing agent as in Example 6 [solubility parameter 10.0, softening point 9
Storage elastic modulus (G ′) at 6 ° C. and 160 ° C. 10 dyn
e / cm ² , weight average molecular weight (Mw) 3000], and finely pulverized powder (average particle size 4 μm) is applied by a known electrostatic coating method so as to distribute an average of 40 particles per 1 cm ^2. Was passed between a pair of steam rollers. The peripheral speed of the roller was 300 mm / sec.

After passing between the pair of rollers, the surface of the transparent film became cloudy as a result of the shape of the cured non-compounded epoxy resin powder being disturbed by the fluororesin-coated roller. The surface at this time had the shape shown in FIG.

Next, using the roughened transparent film, a paper-passing conveyance test similar to that in Example 6 was performed. Both characteristics were good, and neither paper jam nor double feed occurred.

Further, not only the yellow and magenta toners used in Examples 6 and 7 but also a cyan toner and a black toner were used to form a full-color image on a transparent film roughened with the above-mentioned epoxy resin powder not containing a curing agent. Let it form
The image was transferred and fixed. Observation of the obtained image as a light-transmitting image showed that before fixing, the observed white turbidity in the white portion had disappeared after fixing and the haze decreased to 4% or less. In addition, the image portion was a good full-color translucent image without any problem.

[0094]

According to the present invention as described above,
Since the surface of the transparent film is roughened, the frictional resistance is reduced, thereby enabling stable conveyance in the conveyance path of the image forming apparatus, and after fixing the toner image on the transparent film. Since the roughened surface of the transparent film is smoothed by heating and pressing,
When the film of the present invention is filled in a projection device such as an HP,
No scattering of incident light occurs. As a result, the non-image portion, which should be originally white, is reproduced white, and the color image portion is not mixed with gray, and the saturation and the brightness do not decrease.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a full-color copying machine using a light-transmitting transparent film of the present invention.

FIG. 2 is a melting characteristic diagram of a toner used for forming an image on the translucent transparent film of the present invention.

FIG. 3 is a cross-sectional view of various types of roughened light-transmitting transparent films, wherein (a) is a conventional light-transmitting transparent film using matted particles, and (b) to (e) are according to the present invention. Example of a translucent transparent film.

FIGS. 4 (a) to (c) are cross-sectional views of a translucent transparent film according to the present invention.

[Explanation of symbols]

 31 first transparent resin layer 32 second transparent resin layer 33 adhesive layer 35 resin particles

Continuation of front page (58) Fields investigated (Int.Cl. ⁶ , DB name) G03G 7/00 B G03G 13/01 G03G 15/01 Z G03G 15/20 G03G 15/22 103 Z

Claims (30)

(57) [Claims] A first transparent resin layer as a base film and a second transparent resin layer having a rough surface whose surface can be smoothed by heating and pressing, wherein the rough surface is in phase with the second transparent resin. An image-transparent transparent film formed of particles of a resin having solubility. 2. The particles have an average volume diameter of 0.1 μm or more.
The transparent film according to claim 1, which has a thickness of 10 µm. 3. The image-transparent transparent film according to claim 1, wherein the particles are particles of the same resin as a binder resin contained in a toner for forming an image. 4. The rough surface of the second transparent resin layer has an average roughness (R
_Z ) The image-transparent transparent film according to any one of claims 1, 2, and 3, having a thickness of 0.1 µm to 10 µm. 5. The image-transparent transparent film according to claim 1, wherein the first transparent resin layer does not undergo thermal deformation when heated at 100 ° C. 6. A first transparent resin layer which is a base film, and a second transparent resin layer having a rough surface whose surface can be smoothed by heating and pressing, wherein the rough surface is a surface of the second transparent resin layer. An image-transparent transparent film formed by polishing the surface. 7. The rough surface of the second transparent resin layer is 400 to 3.0.
7. The transparent film according to claim 6, having a roughness of 00 mesh. 8. The transparent film according to claim 6, wherein the first transparent resin layer does not undergo thermal deformation by heating at 100 ° C. 9. It has a first transparent resin layer which is a base film and a second transparent resin layer whose surface has a roughened surface which can be smoothed by heating and pressing, and the roughened surface has a minute projection on the surface. An image-transparent transparent film formed by pressing a member having many parts. 10. The transparent film according to claim 9, wherein the rough surface of the second transparent resin layer has an average roughness (R _z ) of 0.1 μm to 10 μm. 11. The image-transparent transparent film according to claim 9, wherein the first transparent resin layer does not undergo thermal deformation when heated at 100 ° C. 12. A first transparent resin layer which is a base film, and a second transparent resin layer having a rough surface whose surface can be smoothed by applying heat and pressure, wherein the rough surface is formed of a second transparent resin layer. An image-transparent transparent film formed by heating and melting a compatible resin and spraying the molten resin on the surface of the second transparent resin layer. 13. The transparent film according to claim 12, wherein the first transparent resin layer does not undergo thermal deformation by heating at 100 ° C. 14. A first transparent resin layer which is a base film, and a second transparent resin layer having a rough surface whose surface can be smoothed by heating and pressing, wherein the rough surface is formed by a Beck smoothness method. An image translucent transparent film, wherein the time is from 80 seconds to 1,000 seconds. 15. The image-transparent transparent film according to claim 14, wherein the first transparent resin layer does not undergo thermal deformation by heating at 100 ° C. 16. A substrate having a first transparent resin layer as a base film and a second transparent resin layer having a roughened surface whose surface can be smoothed by heating and pressing, wherein the roughened surface is heated at 200 ° C. or lower. That can be smoothed by pressure.
The value of the storage elastic modulus at 160 ° C. of the transparent resin layer is 100
image translucent transparent film, which is a ^{dyne / cm 2 ~10,000dyne / cm 2} . 17. The image-transparent transparent film according to claim 16, wherein the first transparent resin layer does not undergo thermal deformation by heating at 100 ° C. 18. A transparent film having a first transparent resin layer serving as a base film and a second transparent resin layer having a roughened surface whose surface can be smoothed by heating and pressing, is provided with a second transparent resin layer. Fixing the image to a transparent film by a step of forming an image with a color toner powder having a soluble binder resin, and applying heat and pressure to smooth the rough surface of the second transparent resin layer. Image forming method. 19. The difference (ΔS) between the value of the solubility parameter (SPr) of the toner powder in the binder resin and the value of the solubility parameter (SPb) of the transparent resin forming the second transparent resin layer.
19. The image forming method according to claim 18, wherein (P = SPb-SPr) is within 1.5. 20. The softening point (SFr) of the transparent resin forming the second transparent resin layer is higher than the softening point (SFb) of the binder resin containing the toner powder, and the difference (ΔS
19. The image forming method according to claim 18, wherein (F = SFr-SFb) is 10 ° C. to 50 ° C. 21. The method according to claim 18, wherein the layer thickness (Lr) of the second transparent resin layer is 1 to 3 times the average particle size (Tp) of the toner powder. 2. The image forming method according to 1., 22. The rough surface of the second transparent resin layer is formed of resin particles compatible with the second transparent resin.
9. The image forming method according to 8. 23. The particles have an average volume diameter of 0.1 μm.
The image forming method according to claim 22, wherein the thickness is from 10 to 10 m. 24. The image forming method according to claim 22, wherein the particles are the same resin particles as a binder resin contained in a toner for forming an image. 25. The image forming method according to claim 18, wherein the rough surface of the second transparent resin layer is formed by polishing the surface of the second transparent resin layer. 26. The image forming method according to claim 18, wherein the rough surface of the second transparent resin layer is formed by pressing a member having a large number of minute projections on the surface. 27. The rough surface of the second transparent resin layer is formed by heating and melting a resin compatible with the second transparent resin, and spraying the molten resin on the surface of the second transparent resin layer. 19. The image forming method according to item 18. 28. The image forming method according to claim 18, wherein the rough surface of the second transparent resin layer has an average roughness (R _z ) of 0.1 μm to 10 μm. 29. The second transparent resin layer having a rough surface of 400 to 3,
The image forming method according to claim 25, having a roughness of 000 mesh. 30. The image forming method according to claim 18, wherein the rough surface of the second transparent resin layer is 80 seconds to 1,000 seconds by a Beck smoothness method.