JPS58102244A - X-ray electrophotographic film base - Google Patents

Abstract

PURPOSE:To obtain an easily readable image high in image density independent of humidity, by using a semitransparent or opaque X-ray electrophotographic film base consisting essentially of an aromatic polyester or an aromatic polycarbonate having an opacity not below a psecified value. CONSTITUTION:A semitransparent or opaque film having >=50% opacity is formed by melt-extruding chips comprising as a main component an aromatic polyester obtained by cocondensing terephthalic acid or 2,6-naphthalenedicarboxylic acid, or the like with an aromatic polycarbonate such as a reaction product of bisphenol A or the like phenol and COCl2 or the like, and as an additive, fine particles of TiO2 or the like. At that time, in the case of using the polyester, it is biaxially stretched and treated under heating, but in the case of the polycarbonate, it is not stretched in the film formation. Use of this X-ray electrophotographic film base permits an always sharp image to be obtained independent of atmospheric humidity, and the image to be easily read without using a Scherekasten.

Description

[Detailed description of the invention] The present invention is an electronic X# photographic film K11l.

More specifically, the present invention relates to a translucent to opaque electronic xIs photographic film having a haze of so% or more.

Electron X-ray photography is a technology that has recently been attracting attention.
Clinically useful in medical and dental applications by combining the photoconductivity of semiconductors and electrostatic phenomena.

It has been used experimentally, and xeroradiography (X
*rerad1・grapky) and ionography (!・kin・grapky) are representative methods. A radiation electrophotographic method using the PIF effect belonging to the former category is also known (see Publication No. 1@47-11141191).

Conventionally, transparent plastic films colored blue, such as polyester films and cellulose acetate films, have been used as base films for X-rays, and similar films can also be used for electronic X-ray photography. It is possible. However, such an X-ray film is transparent, and when reading the obtained ii*, it is necessary to use a shakasten, and it is difficult to read iii* at any location. This problem is solved by using opaque materials as copying materials for electro-radiography. Paper is generally used as an opaque material, but when inner paper is used as a copying material for electronic X-ray photography, it is easily affected by the humidity of the atmosphere at the time of copying. Season and dry season, etc.) From k, large width Kl
Since the i-image densities are different, it has drawbacks such as interfering with image diagnosis.

An object of the present invention is to provide an electronic xm photographic film which overcomes the above-mentioned drawbacks.

That is, the present invention uses a film mainly composed of aromatic polyester or aromatic polycarbonate and has a haze of SO4 or higher, and is a translucent to opaque (preferably opaque #4) electronic X@photographic film. be.

To explain the present invention, when the haze p degree of the film is less than SO4, the contrast between the image formed on the film surface by the electro-X-ray device and the substrate film serving as the background is low, and it is difficult to interpret the image. (There is one thing.

The aromatic polyester used in this fl is a polyalkylene terephthalate whose acid component is terephthalic acid or &6-s7taledicarboxylic acid and whose diol component is a linear aliphatic glycol having 2 to 6 carbon atoms. In addition, hapolyalkylene-2,@-nactalenedicarboxylate has a copolymerization component of 10% or less (e.g., polypyrene glycol, butylene glycol, 4+
Glycols such as 7 ethylene glycol, dicarboxylic acids such as isophthalic acid and 2,7-naphthalene dicarboxylic acid) polymers characterized by K can also be applied;
The intrinsic viscosity of the polyalkylene terephthalate resin and hypoalkylene-2,6-naphthalene dicarboxylate resin described above is the same as that of the orthochlorophenol solvent. Inside SI'c
When measured at K, the range is o,ss to o,s, (preferably 0.46 to 0.11)! It is appropriate to have the following properties because they are excellent in terms of physical properties and grinding operation.

Further, the aromatic polycarbonate used in the present invention has a repeating unit of the following formula. Each -R- in 2I is phenylene,
selected from the group consisting of halogen-substituted phenylene and alkyl electrophenylene, where A and B are hydrogen,
selected from the group consisting of hydrocarbon groups containing no aliphatic unsaturation and groups which together with one C-atom in contact form a cycloalkane group, and the total number of carbon atoms in M and B is not more than 12; be.

A preferred polycarbonate resin is one derived from the reaction of bisphenol A and phosgene. Such a polycarbonate has io to 400 anti-oxidant units of the following formula:

Polycarbonate has an intrinsic viscosity of 2 in methylene chloride.
0.3 to 1.0, preferably 0.4 measured at 5'C
It needs to be in the range of 0-0.6B.

The above-mentioned resin according to the present invention can be manufactured by a method well known in the art, and can be formed into a film.

Semi-transparent 91 of the present invention! The degree of haze of the opaque film is ≦
Must be 〇- or higher. The cloudiness of the test film is 9 degrees.
- If the above is the case, there is a strong contrast between the iir* formed by toner transfer and heat fixing by the electronic xIs photographic equipment and the non-image area, that is, the area to which no toner is attached, and without using Shakasten, i of electronic chi-ray photography! 1ifI
! The diagnosis is Yojima.

Examples of methods for obtaining the opaque film in the present invention include a method of adding and dispersing Kl&particles in the film, and a sandblasting method of projecting sand onto the film surface at high speed.

As a method of adding fine particles, there is a method of adding a predetermined amount of fine particles in the resin manufacturing process mentioned above, and a blend of resin obtained by adding fine particles at once and resin obtained without adding fine particles in the resin manufacturing process. A method in which a predetermined degree of particle interference is achieved by adding fine particles, a method in which a resin KWr obtained without adding fine particles is sprinkled and melt-extruded, or a method in which a film containing fine particles and a transparent film are laminated together can be used.

The fine particle materials used in the present invention include titanium oxide,
Inorganic fine particles such as silicon dioxide, barium sulfate, magnesium carbonate, calcium carbonate, talc, clay, etc. in the form of a single powder or plate, or organic fine particles such as powdered infusible resin can be used. The opacity of the film obtained by the fine particle addition method depends on the material of the fine particles added.

It depends on the particle size, additive concentration, etc., but these should be adjusted appropriately.
By selecting K, it is possible to obtain a film with the required opacity.

If the average particle diameter (primary particle diameter) of the fine particle material is less than 0.01μ, the film will have poor slippage, making copying difficult.

If the thickness exceeds 20μ, the film surface becomes rough and the clarity of the copied image is impaired. Therefore,
The average particle diameter (primary particle diameter) of the fine particle material is suitably between 0.01 μ and 20 pt.

The sandblasting method, which is another method of obtaining the opaque film in the present invention, is a method in which at least one surface of the film is
By projecting sand grains such as silica sand at high speed, the surface of the film is made opaque, and a substantially opaque film with a haze level of sod or higher is obtained.

Furthermore, the opaque film in the present invention can also be obtained by forming a film by a conventional method from a composition in which a polyolefin resin such as polyethylene or polypropylene or a polystyrene resin is added to an aromatic polyester resin or an aromatic polycarbonate resin.

All of the films obtained by the above methods are substantially white, and since the color of the toner used in electronic X-ray photography is generally black or back-colored, they can be used as is without coloring. It is. However, as long as it does not impair its performance as an electro-X-ray film, it must be 11! Depending on the situation, suitable I! ! &Ik It is permissible to color the film with pigments or dyes. Further, the resin used in the present invention may further contain a stabilizer and a conditioner, if necessary.

It can contain a disinfectant, an antistatic agent, and other additives.

The thickness of the film used in the present invention is preferably sepp or more from the viewpoint of film transportability during copying, handling of the copying film, etc., and particularly preferably 15G-200μ. Also, the heat fixing rate for one copy is 18G-10.
Since the process is carried out at a temperature of 0°C, if the film has poor heat resistance, the film will become uneven or wrinkled during heat fixing, which will hinder the use of the film.
318) Kt in both vertical and horizontal directions, less than s%, 1 in %
It is preferable to use a film of ors or less.

Images reproduced using the electro-X-ray photographic film obtained in this way using an electro-XII photographic apparatus were clear, had good contrast with the opaque film material, and were easy to interpret.

Next, the present invention will be explained with reference to Examples. The method of measuring the characteristic values in the examples is as follows.

1. Intrinsic viscosity using orthochlorophenol solvent Measured at 35°C.

2. Haze was determined according to JIB-6714 using an integrating sphere HTR meter manufactured by Nippon Seimitsu Kogaku Co., Ltd.

Example 1 Titanium oxide powder with an average particle size of 0.4μ was sprinkled onto a polyethylene terephthalate tip made by polymerizing terephthalate and ethylene glycol in a conventional manner and having a viscosity of 0.64, and then subjected to melt extrusion. After that, the film was sequentially abraded by 3 times in the vertical and horizontal directions at 115C, and was further heat-treated at 5℃ to obtain an opaque electron X-ray film with a film thickness of 175/f and a haze of 100-. Get photographic film. The O heat shrinkage rate (JI8C-23111) of this film was Ll-9 in the machine direction and os- in the transverse direction. Images obtained using this film using an electro-X-ray photographic device were clear, had good contrast, and were easy to interpret.

Example 3 KIIIL polymerized from turtle-naphthalene dicarboxylic acid and ethylene glycol in a conventional manner, average IE! An unsharpened film obtained by melt-extruding chips of polyethylene 6-naphthalene dicarpoxylate with an intrinsic viscosity of 0.68 obtained by adding silicon dioxide with a concentration of 7P (after primary particles).
30'C, tS times and S, S in the vertical and lateral force directions, respectively.
The film thickness was reduced to 1 by sequentially biaxially stretching and heat-treated at Kzso℃. A top electronic xlI photographic film was obtained. The haze of this film was 76-, and the heat shrinkage rate (JI8C-23111) was 0.27-1 in the machine direction and O, Z S- in the transverse direction. Using this film, an image obtained using an electro-X-ray photographic device was clear, with no image mottling, and no film bulges were observed, making it completely easy to interpret.Example 3 Bisphenol A and diphenyl carbonate are polymerized by a conventional method to form nine polycarbonate chips with an average particle size of o,
Sprinkle with AP china clay powder and melt extrude.
An unstretched film having a film thickness of 175P and a haze of .O-6 was obtained.

The heat shrinkage of this film (free heat shrinkage in hot air at 120° C. for 30 minutes) was almost O. Images obtained using this film using an electro-X-ray photographic device IK were clear and easy to interpret. After melt-extruding the terephthalate chips, the film was further abrasively stretched by three times in the longitudinal and transverse directions at 11!1°C.
After heat treatment at 35℃, the film thickness is 1? A transparent biaxially polished film with a haze degree of 10- was obtained using JP. Furthermore, this film was coated with 1
Opaque electronic X with matte on one side and haze of aoll
A film for line photography was obtained. Thermal shrinkage rate of this film (J
xsc-t3ts) had a length of O1.-9 and a width of 00s-.Using this film, it was
The li-rays formed on the matte surface are clear and have good contrast, making it easy to read the image without using a shaky stain.9.

Claims (1)

[Claims] A translucent to opaque electro-X-ray photographic film containing aromatic polyester or aromatic polycarbonate as a main component and having a haze of 50 or more.