JPH047504B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transparent film for electrophotography, more specifically, a heat-resistant and transparent plastic film having a thickness of 1 μ to 10 μ by adding a cellulose resin and a silicone resin to one or both sides of the film. It relates to a transparent film for electrophotography having a coating layer having a surface resistivity value of 10 ¹⁰ to 10 ¹⁴ Ω,
The objective is to create an electrophotographic film that has good transparency, excellent heat resistance, and good adhesion of the coating film to the film, as well as improved toner fixing properties and, in addition, excellent slipperiness. It is on offer.

In the first place, in electrophotography, in order to obtain good toner image transfer and high image density, the surface resistivity value of the film must be within the range of 10 ¹⁰ to ^{10 14} Ω. In addition, in high-speed electrophotographic machines that use a thermocompression roll system, the temperature of the compression roll is as high as 200 to 230°C, so the film coating layer softens and melts at this temperature, causing the film to be deposited on the compression roll. The film coating layer is required to have sufficient heat resistance to withstand this high temperature because it may adhere and cause paper jams.

Also, when copying, feeding two or more sheets at the same time from the paper feed tray,
In order to prevent so-called double feeding failures, the surface of the film coating layer must have slipperiness, and furthermore, in order to use the copied film for the purpose of overhead project film, the coated film must have high transparency. In addition, there must be no rippling or pebbles during copying.

For electrophotographic films that are subject to such various demands, Japanese Patent Publication No. 34734/1988 describes a plastic film with a heat resistance temperature of 100°C or higher as an electrophotographic film that can increase image density and prevent double feeding from occurring. An organic solvent-soluble polyester resin, an acrylic ester resin, containing 0.1% to 5% by weight of a matting agent with a particle size of 0.05μ to 20μ,
It has been proposed that a layer made of a methacrylic ester resin or a copolymer of styrene and acrylic ester or styrene and methacrylic ester is provided in a thickness of 1 to 10 μm. However, although this film may have been improved in terms of increasing image density and making double feeding less likely to occur, when viewed as an electrophotographic film, it has drawbacks that should be improved. be.

For example, 100 as a base material for electrophotographic film.
Polyester film is generally used as a heat-resistant film above ℃, but when a polyester resin is used as a resin containing a matting agent to be applied onto the film, the matting agent-containing polyester resin has good adhesion to the film. However, it has poor heat resistance, and the polyester resin is often fused to the thermocompression roll of a copying machine, causing the film to wind up on the roll. In addition, although acrylic ester and methacrylic ester resins have good heat resistance, they have the disadvantage of poor adhesion to the polyester film base material, making the coating layer on the polyester film unstable. It has drawbacks. Furthermore, this electrophotographic film is said to have been prevented from double feeding by using a matting agent (particle size 0.05μ to 20μ, 0.1% to 5% by weight), but the matting agent contributes to preventing double feeding. Even if the matting agent is mixed in, the transparency of the polyester, acrylic ester, methacrylic ester, etc. film that is to be coated will be impaired, and as a result, the transparency of the electrophotographic film will be lower than when no matting agent is mixed. It is inevitable that the situation will decline in comparison.

The present inventors have developed a resin layer to be coated on an electrophotographic film that does not have these drawbacks, that is, a heat-resistant transparent film, which has excellent heat resistance as well as adhesion to the base film. As a result of intensive research and various experiments in order to obtain an electrophotographic film with excellent slipperiness, extremely good transparency, and good toner fixing properties, we found that heat-resistant plastics such as polyester, cellulose triacetate, etc. Cellulose acetate,
For cellulose resins such as nitrocellulose,
An electronic material containing silicone resin in an amount of 0.2% to 2.0% based on the resin solid content of the cellulose resin and having a coating layer with a thickness of 1μ to 10μ and a surface resistivity value of 10 ¹⁰ to 10 ¹⁴ Ω. By using a photographic transparent film, the object can be well achieved and the present invention has been achieved.

The heat-resistant plastic film used in the present invention refers to a plastic film with a heat resistance temperature of 100°C or higher, such as a film made of polyester, polysulfone, polyimide, polycarbonate, cellulose triacetate, polyamide, etc. In most cases, polyester film is used. , even these films must be transparent.

The coating layer in the present invention is a coating layer made of a cellulose resin containing a silicone resin, more specifically, a coating layer in which 0.2% or more is added to the resin solid content of the cellulose resin. It is best to prepare an organic solvent-based paint consisting of a cellulose resin, a silicone resin, and an organic solvent and apply it on a plastic film to obtain a coating layer, but it is not limited to organic solvent-based paints. It is also possible to prepare a water-based paint, such as an emulsion, and thereby obtain a coating layer. When preparing the organic solvent-based paint described above to obtain a coating layer, cellulose-based resins used therein are preferably cellulose acetate, nitrocellulose, or the like. Further, as the silicone resin, a methyl group-modified methyl silicone resin which is soluble in an organic solvent is preferably used, and is added in an amount of 0.2% or more based on the resin solid content of the cellulose resin. Further, the organic solvent may be any solvent as long as it can dissolve both the cellulose resin and the silicone resin.

The amount of the silicone resin added is 0.2% to 2.0% based on the resin solid content of the cellulose resin, but it is particularly preferable that the amount is 0.4% or more to impart slipperiness that does not cause double feeding failures, and this is 1.0% or more. Even when added, it does not affect toner fixing properties,
Furthermore, a highly transparent film was obtained. However, although it varies depending on the type of silicone, when 2% or more of silicone resin is added, toner fixing properties are affected.

The cellulose resin used in the present invention has a volume resistivity of 10 ¹¹ to 10 ¹⁴ Ω, has excellent transparency and heat resistance, and has the extremely favorable property of firmly fixing the toner during heat fixing. However, the coating film obtained by applying cellulose resin to heat-resistant plastic film has a surface frictional resistance that completely prevents double feeding from the paper feed tray when copying with an electrophotographic machine. By adding silicone resin to this, it was possible to improve the slipperiness and completely prevent double feeding failures.At this time, when silicone resin was added as a slipping agent, the paint film At the same time as the slipperiness of the surface is improved, a mold release effect due to silicone also occurs, which also causes toner fixation to deteriorate. In order to satisfy both requirements, it has been discovered that silicone resin can be added in an amount of 0.2% to 2.0% based on the resin solid content of the cellulose resin.

Also, when applying cellulose resin to heat-resistant plastic film, depending on the type of heat-resistant plastic film, the adhesion between the paint film made of cellulose resin and silicone resin and the heat-resistant plastic film may be satisfactory. In this case, for example, polyester resin, polyamide resin, phenol resin,
Epoxy resin, amino resin, polyurethane resin,
Polycarbonate resin, vinyl acetate resin, vinyl chloride resin, vinyl chloride-vinyl acetate copolymer, styrene resin, styrene-acrylic ester copolymer, styrene-methacrylic ester copolymer, acrylic ester resin, methacrylic ester resin , ethylene-vinyl acetate copolymer, styrene-vinyl acetate copolymer, alkyd resin, chlorinated rubber, butyral resin, vinylidene chloride resin,
By adding one or more of chlorinated olefin resins, alkyd-phenolic resins, styrene-acrylonitrile copolymers, etc. to a paint made of cellulose resin and silicone resin, adhesion can be achieved to a satisfactory degree. improves. For example, when the film is a polyester film, resins such as polyamide, polyester, and polyurethane are preferable as the additive resin for reinforcing adhesion.

In addition, the surface electrical resistance value of a paint film made of a cellulose resin and a silicone resin, or a paint film made of a cellulose resin, a silicone resin, and a resin to strengthen adhesion is 10 ₁₄ Ω. In this case, it is necessary to add an antistatic agent to the above-mentioned paint to adjust the surface electrical resistance value within the range of 10 ¹⁰ to 10 ¹⁴ Ω.

The electrophotographic transparent film of the present invention has a heat-resistant plastic film as a base material and a layer made of cellulose resin and silicone resin, so the excellent transparency of cellulose resin is due to the silicone resin. Moreover, since the heat resistance is good, the film does not stick to the thermocompression roll and the toner fixability is extremely good, and the coating film on the base film is Not only does this cellulose-based resin have extremely good adhesion, but since silicone resin is added in an amount of 0.2% or more based on the resin solid content of this cellulose-based resin, its slipperiness is extremely excellent, reducing the risk of double-feeding failures. The prevention is complete, and since silicone resin has no effect on toner fixing, cellulose resin's adhesion to film, or transparency, a matting agent is added to improve slipperiness. In contrast, it does not affect transparency at all, so a highly transparent film can be obtained.

The transparent film for electrophotography according to the present invention is prepared by adding a coloring agent to the organic solvent-based paint to give a visual effect when used for organizing and classifying or for overhead projection. A colored transparent film can also be obtained.

Next, the present invention will be explained in more detail with reference to Examples.

SL-1 (manufactured by Asahi Kasei Kogyo Co., Ltd., nitrocellulose resin, IPA 30% wet) 2 parts, NL-FM medium (manufactured by Morohoshi Ink Co., Ltd., polyamide-cellulose resin, solid content 25%) 12.0 parts, silicone
KP-302 (manufactured by Shin-Etsu Chemical Co., Ltd., methyl group-modified methyl silicone resin, 10% solids solution) 0.3 parts,
An organic solvent-based paint consisting of 0.3 parts of Elenon No. 19-M (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd., antistatic agent), 18 parts of butyl acetate, and 9 parts of isobutanol was prepared, and a biaxially stretched polyester film (thickness: 100μ) was prepared. ) was coated on both sides with a wire bar to a film thickness of 3 μm, and after drying, the surface resistivity value was 1×
A transparent film for electrophotography with a resistance of 10 ¹³ Ω (20°C, 65/%RH) was obtained. The results of tests conducted on this electrophotographic transparent film and an unadjusted polyester film regarding multifeedability, toner images, toner fixability, and transparency are shown below.

Film according to the present invention Unadjusted polyester film double feeding (paper jam) ○ × Toner image ○ △ Toner fixability ○ × Transparency ○ ○ Notes ○: Good (pass) △: Average ×: Unsuitable (fail) Model used, Xerox 4800 (manufactured by Fuji Xerox Co., Ltd.) Example 2 5.0 parts of CAP (manufactured by Eastman Chemical Co., Ltd., cellulose acetate propionate), 95.0 parts of Methyl Cellosolve, silicone KP-302 (manufactured by Shin-Etsu Chemical Co., Ltd., 10% solids solution) )0.2 parts, and coated on both sides of cellulose triacetate film (thickness 100μ) with a wire bar to a coating thickness of 3μ.
After drying, the surface resistivity value is 2×10 ¹³ Ω (20℃, 65
%RH) was obtained. The results of tests conducted on this electrophotographic transparent film and unadjusted cellulose triacetate film in terms of multifeedability, toner image, toner fixability, and transparency are shown below.

According to the present invention Film unadjusted cellulose Striacete film Double feed (paper jam) ○ × Toner image ○ △ Toner fixability ○ △ Transparency ○ ○ Note ○: Good (pass) △: Normal ×: Unsuitable (fail) Model used: Xerox 4800 (Manufactured by Fuji Xerox Co., Ltd.)

Claims (1)

[Claims] 1. Cellulose acetate, cellulose acetate, etc. on one or both sides of a transparent film made of heat-resistant plastic such as polyester, cellulose triacetate, etc.
For cellulose resins such as nitrocellulose,
It contains a silicone resin in an amount of 0.2% to 2.0% based on the resin solid content of the cellulose resin, has a coating layer with a thickness of 1μ to 10μ, and has a surface resistivity value of 10 ¹⁰ to 10 ¹⁴ Ω. A transparent film for electrophotography characterized by the following. 2. A patent claim characterized in that a resin such as polyamide, polyurethane, acrylic ester, methacrylic ester, styrene, vinyl acetate, or a copolymer resin thereof is added to the coating layer to enhance adhesion. A transparent film for electrophotography according to item 1. 3. The transparent film for electrophotography according to claims 1 and 2, wherein an antistatic agent is added to the coating layer.