JPS61237679A - Transparent medium for recording - Google Patents

Abstract

PURPOSE:To obtain a transparent recorded medium by a printing means, by a method wherein a transparent base is provided with a surface capable of being dissolved in or swelled with a specified high boiling point solvent, and the visible ray transmittance thereof is set to be not lower than 80%. CONSTITUTION:A high boiling point solvent having a vapor pressure at 20 deg.C of not higher than 1mmHg is used as an ink (e.g., an ink for an ink ribbon) in a printing means of the ink jet system, an impact system or other system. A composition comprising as a main constituent a resin capable of being dissolved in or wetted with the solvent is provided on a surface of the transparent base (e.g., by coating), and while maintaining transparency, characters or figures formed on the surface of the base by a printing means are fixed. Therefore, the resin is one having excellent transparency, e.g., cellulose acetate or cellulose acetate butyrate, and the base is a transparent synthetic resin film, a transparent paper or the like, preferably, the one having a visible ray transmittance of not lower than 90%.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to transparent recording materials, particularly transparent color recording materials,
In other words, regarding ink-receptive transparent materials for recording, which serve as the sheath for creating transparent originals, we mainly focus on creating transparent originals that can project excellent images on the screen when applied to automatic head projectors. This relates to sheets that are used for.

[Technical background and problems]

Transparent sheet-like recording materials are generally produced by handwriting with a pen on a transparent film base, copying by electrophotography,
It is created by applying a recording method such as thermal transfer using flash light (thermographic method) or printing using a printing machine (hereinafter referred to as printing means).

As mentioned above, various recording methods are employed, but
Handwriting or printing is a method for directly recording characters, figures, etc. on a transparent substrate, generally a transparent film surface, without preparing an original document in advance.

In this direct recording method, the fixation of characters, figures, etc. on the surface of the transparent film is the biggest problem that determines its practical possibility.

In the present invention, fixability refers to a characteristic that combines the apparent drying speed of ink in printing (the drying speed at which the ink does not come off even when lightly rubbed with a finger) and the fixing power of ink.

In general, fixability is determined by the synergistic effect of the drying ability of the ink itself and the ink absorption ability of the surface of the recording material. Therefore, the film surface is treated to increase its ink absorption ability, and in this case, methods such as providing a layer with micropores on the surface are used. However, this method has a problem in that the transparency of the transparent film decreases.

By the way, in the case of manual printing, if you record on the surface of a transparent film using a so-called oil-based felt hen, which contains an ink consisting of a low-boiling point solvent as one component, the ink itself dries quickly, so the fixing properties are not affected much. There is no problem.

Typical printing methods include the in-jet method, the impact method of wire tod printers, and type printers, but in either case, the physical properties of the ink itself greatly affect the printing function. In particular, ink ribbons used in the impact method must retain ink in an undried state almost forever.
It is not possible to use an ink whose main component is a low boiling point solvent. Therefore, the solvent, which is a component of the ink used in the printing means, must have a high boiling point.

Therefore, the iJ ink itself has extremely poor drying ability. Generally, no matter what force printing means is used, when recording with such ink is performed on the surface of a normal transparent film, the fixability is extremely low R1, and it cannot be put to practical use.

However, with the rapid spread of CAD systems, processors, etc., there was a strong desire to obtain transparent recording materials using printing methods, and transparent materials that could be recorded using these printing methods were becoming more and more popular. desired.

[Audience of invention]

As mentioned in the previous section, in order to completely maintain the transparency of the transparent substrate by the printing means and to impart excellent fixing properties of characters, figures, etc. to the surface of the transparent substrate, the ink used in the printing means must be used. It has been found that it is necessary to treat the transparent film M1 in connection with the -a component of the solvent.

Therefore, as a result of research based on this knowledge, the present invention was completed.

The present invention preferably has a vapor pressure of θ, /i1MJ or less at 20°C on one or both sides of a transparent base material.
The present invention relates to a transparent material for recording, which has a surface that dissolves or swells in a high boiling point solvent of H(g or less), and has a visible light transmittance of Z 6 - H or higher.

In other words, the high-boiling bath agent selected as a high-boiling solvent essential for the ink composition (with a vapor pressure of /IJLI
If a treated layer is provided on the surface of a transparent substrate using a composition containing as one component a resin that disintegrates or swells in J111g or less of high boiling point solvent, the high boiling point solvent will dissolve or swell the treated layer immediately after printing. As a result, it is highly practical as a transparent recording material with extremely good fixing properties for printed characters, figures, etc.

A high boiling point solvent with a vapor pressure of 721 iffHg or less at 2Q 'C is an excellent bath agent in terms of ink composition, and can be used as an alternative to the non-drying oil sealant such as linseed oil, which has been commonly used in the past. The ink produced by this method exhibits excellent physical properties as an ink (for example, as an ink for ink ribbons) in various printing methods such as the inkjet method and the impact method.

Examples of such solvents include aromatic hydrocarbons such as triethylbenzene, diterpenes, aromatic petroleum naphtha), alcohols such as n-octyl alcohol, n-decyl alcohol, diethylene glycol, and schizolopyrene glycol. , ethylene glycol monophenyl ether, diethylene glycol monoether ether, diethylene glycol motsubutyl ether, ethylene glycol monoethylhexyl ether aye acid diethylene glycol monoether ether, vinegar Fl ethylene glycol J col monozotel ether, etc. can give.

As described above, the present invention has a vapor pressure of /W at 2.0°C.
A composition mainly consisting of a resin that dissolves or swells in an iW1 boiling point solvent of JHg or less is applied (for example, coated) to the surface of a transparent substrate, and while maintaining transparency, it is printed on the surface of the transparent substrate by a printing means. The composition to be applied to the transparent base surface must have excellent transparency because the purpose is to improve the fixation of characters and graphics. Therefore, the resin itself, which is the main component of the composition, must have excellent transparency. In addition, when preparing this composition, it is necessary to improve adhesion to the surface of a transparent substrate, or to impart wear resistance, scratch resistance, slip property, antistatic property, etc. to the surface of a layer formed with the composition. Appropriately, natural resins, synthetic resins, inorganic or organic fine particles, antistatic wounds can be used, and a coloring composition can be obtained by adding a coloring agent. Furthermore, in order to further enhance the effects of the present invention, it is also possible to add a surfactant having a penetrating action. However, these additions must not impede transparency. When applying the composition to the surface of a transparent substrate, it may be applied in multiple layers, such as one layer or three layers, as long as transparency is not impaired. Furthermore, an anchor layer may be provided between the layer of this composition and the transparent substrate to improve adhesion.

Examples of the resin forming the treatment layer of the present invention include cellulose resins such as cellulose acetate, cellulose acetate, nitrocellulose, and ethyl cellulose, polyvinyl butyral resin, polystyrene resin, polyvinyl acetate resin, vinyl chloride vinyl acetate, etc. Polymer resins have relatively poor solvent resistance, and as mentioned above, the vapor pressure at a'C is /u
Among high boiling point solvents having a temperature of Hg or less, resins that are soluble or swell in the solvent used in the ink component and have transparency are used.

In the above, we have explained transparent recording materials obtained by treating the surface of transparent substrates with compositions mainly composed of these resins, but transparent recording materials can also be produced by forming films from compositions mainly composed of these resins. The object of the present invention to obtain is achieved.

The method of applying the composition to the surface of the transparent substrate is not particularly limited, but the thickness of the treated layer in this case should be such that it has excellent transparency and
In order to exhibit excellent fixing properties of characters, figures, etc. by the printing means, lμ to mμ is preferable.

The transparent base material used in the present invention is generally a transparent film-like part, such as a transparent synthetic resin film, transparent paper, etc., but the more transparent the better, preferably the one that is transparent to the visible light. It is preferable to have a transmittance of qO or more.

Specifically, polyester film, polypropylene film, polyvinyl chloride film, acetate film, etc. are suitable.

Further, the preferable thickness of these transparent bases is selected depending on the purpose of use, but in general, a thickness of 2 sμ to /gOμ is preferable for recording characters and figures by a printing means.

[Effects of the Invention] The transparent material for recording obtained according to the present invention has excellent properties when printed using an ink containing a high boiling point solvent having a vapor pressure of /11111Hg or less at 3°C. The characters printed on it while maintaining its transparency,
It is possible to provide a transparent recording medium with excellent fixing properties for figures and the like. In particular, color transparent recording materials printed in multiple colors using ink components containing colorants have excellent performance.
When projected using a quector, it becomes an original image for projection that exhibits extremely excellent performance.

〔Example〕

Examples of the present invention are shown below.

Example/.

Inkliil? As an ink composition for printing, nitrocellulose lj part red pigment
Using a red ink prepared by mixing 30 parts dienalene glycol monobutyl ether, 70 parts dispersant o, and 4μ, and dispersing it using a three-roll mill,
Ink adhesion 'A: An ink composition with tsy /ln1 was prepared.

On the other hand, BL-/ (nitrocellulose resin manufactured by Mukasei Kogyo Co., Ltd., PAjθchi wet) 4I! . 3rd part lJ TJ -F
IA Me2 Buddha (Moroboshi Ink Co., Ltd. Polyamide F-Cellulose Dashjin Resin, solid side) g Part Butyl acetate
An organic solvent-based paint consisting of 1 part isobutanol and 1 part is prepared.
By applying it to one side using
A transparent recording material with a visible light transmittance of 93% was prepared.

When we printed on this recording material with a wire tod printer using the previously adjusted ink resin, the print was completely fixed in about j seconds after printing, and the ink did not come off even when rubbed with a finger. . When this printed sheet was projected using an automatic head projector, a clear red projected image was obtained.

For comparison, similar printing was performed on an untreated 100μ biaxially oriented polyester film using the InClean used in the present invention and a conventional ordinary Incrisin, and the same printing was performed using the InClean according to the present invention. After 5 minutes if you use normal ink IJ, if you use 1
Even after a week, when I rubbed the print with my finger, the simple ink came off, making it completely useless.

Example 2 Ink composition: polystyrene resin, io group chlorinated paraffin, J section blue pigment / J' section Hysol 5A
An ink ribbon was prepared in the same manner as in Example 1 using 70 parts of 8-Kota 1 (high-boiling aromatic hydrocarbon solvent manufactured by Nippon Oil Co., Ltd.).

Next, a 100μ thick biaxial coating with an organic solvent-based paint consisting of 73 parts of polystyrene resin, 70 parts chlorinated paraffin (70% chlorinated), 2 parts toluene, 10 parts xylene, and which has been undercoated to improve adhesion. Stretched polyester tree 1
Apply on one side of 1W film using a wire nozzle.
Visible light transmittance after drying to form a coating film with a thickness of ≠μ is 9
A 2% transparent recording material was prepared.

When the ink resin was printed on this recording material using a wire tod printer, the print was completely fixed in about 80 seconds after printing, and the print did not come off even when rubbed with a finger. When this printed sheet was projected using an O-Hetsu R projector, a clear blue projected image was obtained.

For comparison, sheets of untreated 100μ biaxially oriented polyester film were printed in the same way using the incrisine used in the present invention and conventional incrisine, and the printing was still possible with a finger even after one hour. The ink easily came off when I rubbed the surface, so it was completely useless.

Procedural amendment Showa AIJ/9

Claims (1)

[Claims] A transparent material for recording, characterized in that it has a surface on at least one side that dissolves or swells in a high boiling point solvent having a vapor pressure of 1 mmHg or less at 20° C., and has a visible light transmittance of 80% or more.