JPH112914A - Electrophotographic copying paper and copying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain electrophotographic copying paper excellent in water resistance and smoothness and having high image quality and high fixing performance by sticking base paper on plastic film with heat. SOLUTION: The base paper and the plastic film are stuck with the heat. It is desirable to use substance whose critical surface tension γC is >=31 dyne/am such as polyester, polyvinylidene chloride, polyvinyl chloride, nylon, styrenebutadiene copolymer, butadiene-stylene-acrylic ester copolymer or polyolefine as the plastic film. For example, nylon film 1 as the plastic film whose thickness is 20 μm and woodfree paper as the base paper 2 whose thickness is 100 μm are fit and made to pass between a silicone rubber heat roller 3 whose surface is heated at 120 deg.C by a heater 4 and a pressure roller 5 so as to stick the plastic film 1 on the base paper 2, whereby the copying paper 6 is produced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic copying paper having excellent water resistance, smoothness, and high image quality and fixing properties, a method for producing the same, and a copying apparatus using the same. In addition, the electrophotographic copying paper can also peel off the plastic film from the base paper if necessary after image formation. The electrophotographic copying paper of the present invention can be used as a printing paper, but is particularly suitable for use in a transfer type electrophotographic copying process and an ink jet recording process.
It is optimally used for an intermediate transfer type color process in which each color image formed on the intermediate transfer member is transferred at once after image formation.

[0002]

2. Description of the Related Art Conventionally, to improve the smoothness of copy paper, use of conventionally coated paper, calendering by pressure, OH
The use of a P film or the like has been used. However,
Paper has poor smoothness due to moisture absorption and has a problem in water resistance. On the other hand, the OHP film has no problem with respect to water resistance or the like, but may be disadvantageous in that it is bent or has transparency. In addition, there is a disadvantage that the fixability with the toner is weak.

[0003] Therefore, various coating processes have been applied to paper to use as electrophotographic transfer paper, and resin-treated paper has been used as electrophotographic transfer paper. For example, Japanese Unexamined Patent Publication (Kokai) No. 55-112398 discloses that a conductive paper of a polymer onium salt is applied to a base paper which is coated with an aqueous coating liquid such as an ethylene-vinyl acetate copolymer, a styrene-butadiene copolymer or sodium alginate and smoothed. Image density,
It is described that an electrophotographic transfer paper having improved writability and resolution as well as solvent resistance and adhesiveness is obtained, and JP-A-4-303847 discloses that an adhesive (styrene-styrene) is provided on both sides of a base paper. Reactivity with resin latex such as butadiene copolymer, ethylene-vinyl alcohol copolymer, methyl methacrylate-butadiene copolymer, ethylene-vinyl acetate copolymer, oxidized starch, carboxymethyl cellulose, hydroxyethyl cellulose, casein, gelatin, etc.) The contact angle (TAPPI STD T-458) after treatment with a coating liquid containing a substituent-containing aqueous silicone oil and drying is 75 to 12
By changing the contact angle changing speed at 0 ° from 0.5 to 0.01 ° / second, the image density, resolution, writing properties, and printing properties of the electrophotographic transfer image receiving paper can be improved. It is described that the method can be improved.
In the publication, a coating layer made of a polyurethane resin obtained by reacting an organopolysiloxane polyol with a polyisocyanate obtained by reacting a polymer polyol and a polyisocyanate is provided on at least one surface of a base paper, and a silicone oil-absorbing and running property is provided. JP-A-6-27711 discloses that a laminated sheet comprising a styrene-acrylic acid copolymer and a modified starch has excellent properties, resolution and image density. 5-10% by weight
It describes that the running property of the electrophotographic transfer image receiving paper is improved by coating a base paper with a coating liquid containing talc and calcium carbonate powder. However, as a practical matter, transfer of electrophotographic transfer paper for electrophotography due to these resin coatings has a limit in terms of surface smoothing due to coating, and is likely to be deformed during the process of evaporating and removing the medium liquid. There is a disadvantage that it is difficult to peel off from paper.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention, in view of the above prior art, is to provide good water resistance and smoothness.
An object of the present invention is to provide an electrophotographic copying paper having high image quality and high fixability, and to provide a method for producing the same. Another object of the present invention is to provide a copy paper which can be separated from a base paper and a plastic film as needed after forming an image, and to provide a copying apparatus using the same.

[0005]

The object of the present invention is to provide (1) an electrophotographic copying paper characterized in that a base paper and a plastic film are bonded by heat, and (2) the present invention.
"The critical surface tension γ
(c) the electrophotographic copying paper according to the above (1), wherein c is 31 dyne / cm or more;
(3) The above-mentioned plastic film is characterized by using polyester, polyvinylidene chloride, polyvinyl chloride, nylon, styrene-butadiene copolymer, butadiene-styrene-acrylate copolymer, polyolefin. (2) The electrophotographic copying paper described in the item (2) ”and (4)“ The plastic film is made of vinyl chloride resin, vinylidene chloride resin, nylon,
(3) The electrophotographic copying paper according to the above (3), which is a film of a polyolefin resin, and / or (5) an electrophotographic copying machine,
A copying apparatus characterized by having means for producing a copy paper by adhering paper and a plastic film with a heat roller and means for forming an image on the copy paper "and (6)" a heat roller is a silicone oil application roller " Or the copying apparatus according to the above mode (5), which is a Teflon roller.

Hereinafter, the present invention will be described in detail. Examples of the plastic film used for the electrophotographic copying paper of the present invention include polyhexamethylene adipamide (critical surface tension γc = 46 dyne / cm) and polyester (polyethylene terephthalate) film (critical surface tension γc = 4).
3dyne / cm), polyvinylidene chloride (critical surface tension γ
c = 40 dyne / cm), polyvinyl chloride (critical surface tension γc = 39 dyne / cm), chloroprene (critical surface tension γc = 38 dyne / cm), polyvinyl alcohol (critical surface tension γc = 37 dyne / cm), nylon 6,6 (Critical surface tension γc = 37 dyne / cm), chlorinated polyisobutylene (critical surface tension γc = 37 dyne / cm), butadiene-acrylonitrile copolymer (critical surface tension γc =
37dyne / cm), chlorosulfated polyethylene (critical surface tension γc = 37dyne / cm), nylon 11 (critical surface tension γc = 36dyne / cm), polymethyl methacrylate (critical surface tension γc = 36dyne / cm), hydrochloride rubber (Critical surface tension γc = 36 dyne / cm), polystyrene (critical surface tension γc = 33 to 43 dyne / cm), polyepichlorohydrin (critical surface tension γc = 35 dyne / c)
m), cyclized polyisoprene (critical surface tension γc = 34dy)
ne / cm), styrene-butadiene copolymer (critical surface tension γc = 33 dyne / cm), styrene-butadiene block copolymer (critical surface tension γc = 33 dyne / c)
m), poly-1,3-butadiene-cis (critical surface tension γc = 32 dyne / cm), polyethyl methacrylate (critical surface tension γc = 31.5 dyne / cm), polyethylene (critical surface tension γc = 31 dyne / cm) , Polyisoprene-cis (critical surface tension γc = 31 dyne / cm),
Polytrifluorochloroethylene (critical surface tension γc =
31dyne / cm), polybutadiene (critical surface tension γc)
= 31 dyne / cm), poly-1.3-butadiene (critical surface tension γc = 31 dyne / cm), polyisoprene-trans (critical surface tension γc = 30 dyne / cm), polybutyl acrylate (critical surface tension γc = 29 dyne / cm) c
m), ethylene propylene rubber (critical surface tension γc = 2
8 dyne / cm), polyvinyl fluoride (critical surface tension γc = 28 dyne / cm), polyhexyl acrylate (critical surface tension γc = 27.5 dyne / cm), isobutene-isoprene copolymer (critical surface tension γc = 27 dyne)
/ cm), silicon (critical surface tension γc = 24.5-2)
8 dyne / cm), atactic 4-methylpentene (critical surface tension γc = 25 dyne / cm), poly-1,2
-Butadiene (critical surface tension γc = 25 dyne / cm),
Polyvinylidene fluoride (critical surface tension γc = 25dy
ne / cm), polyoctyl acrylate (critical surface tension γc = 23.5 dyne / cm), polytrifluoroethylene (critical surface tension γc = 22 dyne / cm), polylauryl acrylate (critical surface tension γc = 21.3 dyne / c)
m), polystearyl acrylate (critical surface tension γc
= 20.8 dyne / cm), polyoctadecyl acrylate (critical surface tension γc = 20 dyne / cm), polytetrafluoroethylene (critical surface tension γc = 18.5 dyne / c)
m), polyhexafluoropropylene (critical surface tension γ
c = 16.2 dyne / cm), surface energy, wettability and adhesion, thermal properties such as Tg, TMF and Tm (thermocompression at 50 to 200 ° C, film forming ability and film surface) Is selected in consideration of the smoothness of the paper, the hygroscopicity, and the presence or absence of reactivity with the base paper.

[0007] In the electrophotographic process, the developer is
It is transferred directly from the photoreceptor to the base paper, or transferred from the photoreceptor to the intermediate transfer body and then finally transferred from the intermediate transfer body to the base paper. These transfers involve scramble for developer between the photoreceptor and the base paper, scramble for developer between the photoreceptor and the intermediate transfer body, and scramble for the developer between the intermediate transfer body and the base paper. In other words, generally, the developer is deprived of the surface having a large surface energy, except for the electrostatic attraction-repulsion force. Therefore, the surface energy affects the wettability and the adhesion. Whose magnitude is the critical surface tension γ
It can be represented by the magnitude of c. The plastic film used for the electrophotographic copying paper of the present invention, depending on the surface energy of the photoreceptor and the intermediate transfer member,
In general, those having a critical surface tension γc of 31 dyne / cm or more are preferable. Among them, polyester (P) is preferred in consideration of thermal characteristics, hygroscopicity and reactivity to base paper.
ET) Film, polyvinylidene chloride, polyvinyl chloride, nylon, styrene-butadiene copolymer, butadiene-styrene-acrylate copolymer, polyolefin film such as polyetherene and polypropylene are more preferable, and the film strength, rigidity, etc. From the viewpoint of easy handling, polyester, polyvinylidene chloride, polyvinyl chloride, nylon, and polyolefin are most preferable.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory view showing an example of a method for producing electrophotographic copying paper of the present invention. In the example of FIG. 1, a 20 μm thick nylon film (1) as a plastics film and a 100 μm thick high quality paper as a base paper (2) are combined, and the surface is heated to 120 ° C. by a heater (4). Passed between the silicone rubber heat roller (3) and the pressure roller (5) to form a plastic film (1).
Was adhered onto a base paper (2) to produce a copy paper (6) of the present invention. In this example, as described above, a silicone rubber heat roller (3) heated to 120 ° C. and a pressure roller (5)
However, in the present invention, depending on the Tg, TMF (minimum film formation temperature) and Tm of the plastic film used, generally between the two rollers heated to the range of 50 to 200 ° C. Are adhered by applying pressure and heating while passing through.

FIG. 2 shows a copying machine in which the copying paper manufacturing apparatus is built in a copying machine. A high quality paper (2) having a thickness of 100 μm as a base paper and a nylon film (1) having a thickness of 20 μm as a plastic film are provided. Adhesion is made between the heat roller (3) and the pressure roller (5) to produce copy paper (6). Next, on the copy paper (6), image forming units (7), (8), (9), (1) of yellow, magenta, cyan, and black are formed.
At 0), an image is formed, and electrophotographic copying paper (11) having the image is discharged from the copying machine. Silicone oil (KF96-300C) for silicone roller (3)
S is applied to prevent the plastic film from fusing to the silicone roller (3).

[0010]

【Example】

[Example 1] As a base paper, a thickness of 100 from Daishowa Paper Co., Ltd.
FT-400i silicone roller 12 with 20 micron thick nylon film on micron quality paper
Copy paper A which was thermally bonded at 0 ° C. was obtained. The smoothness of this copy sheet was 180 seconds. Recopy FT-4
When copying was performed using copy paper A at 00i, copy paper having an image density of 1.28, a fixing property of 75%, and excellent water resistance was obtained. With only high quality paper, the image density was 1.06 and the fixability was 68%. Nylon film alone could not be conveyed and copies could not be made.

Example 2 Similar to Example 1, a copy paper B was prepared using a vinyl chloride film of 100 microns instead of nylon, and a copy was made.
60 sec, image density 1.30, fixability 7
9%. A copy with excellent water resistance was obtained. Copying was not possible due to poor transportability using only vinyl chloride film.

[Examples 3 and 4] The plastic films and the base paper used in Examples 1 and 2 were heat-bonded with a Teflon roller at 90 ° C. to obtain copy papers C and D.

[Embodiments 5 and 6] Using the copying apparatus shown in FIG.
Example 5 is vinylidene chloride, Example 6 is polyethylene,
The methacrylic acid copolymer film was thermally bonded to wood free paper and copied.

[Comparative Example 1] When a copy was made in the same manner as in Example 1 using a Teflon film, a normal copy could not be obtained because it did not thermally adhere to the high quality paper as the base paper. Therefore, the image density was as low as 0.68 and the fixability was as low as 16%. The results are shown in Table 1 below.

[0015]

[Table 1]

[0016]

As is apparent from the detailed and specific description above, according to the present invention, a copy paper in which a base paper and a plastic film are bonded by a heat roller has a high image density, and has improved fixability and water resistance. When vinyl chloride resin, vinylidene chloride, nylon, and polyolefin are used as the plastic film, toner fixing property,
The effect of improving the image density is recognized. The plastic film has low Clark stiffness and has a problem in transportability in a copying machine. However, in this method, transportability is improved.
Also, when bonding the base paper and the plastics at a low temperature, there is an extremely excellent effect that, as in Examples 3 and 4, there is an advantage that an image can be output on the plastics by peeling off the base paper. Be demonstrated.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a method for producing a copy paper of the present invention.

FIG. 2 is a diagram illustrating a copying machine having a built-in apparatus for manufacturing copy paper according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 plastic film 2 base paper 3 heat roller 4 heat heater 5 pressure roller 6 copy paper 7 yellow image formation unit 8 magenta image formation unit 9 cyan image formation unit 10 black image formation unit 11 copy image

Claims (4)

[Claims] 1. An electrophotographic copying paper characterized in that a base paper and a plastic film are bonded by heat. 2. The electrophotographic copying paper according to claim 1, wherein the plastics film is a film of a vinyl chloride resin, a vinylidene chloride resin, or a polyolefin resin. 3. An electrophotographic copying apparatus comprising: means for manufacturing a copy sheet by bonding paper and a plastic film with a heat roller; and means for forming an image on the copy sheet. 4. The copying apparatus according to claim 3, wherein the heat roller is a silicone oil application roller or a Teflon roller.