JPS59202893A - Recording material for electric transmission transfer - Google Patents

Abstract

PURPOSE:To obtain a high quality image on a recording medium. such as a common paper material by constructing a recording medium in 2-layer structure of base-layer beginning with the recording electrode side and ink-layer or in 3- layer structure of base-layer, intermediate-layer and ink-layer and providing the ink layer with the specified melting visocity. CONSTITUTION:A base-layer 11 is manufactured by extruding a base-layer forming resin from a T-shape die after it is brought to a molten state and forming liquids of the ink-layer 13 or intermediate-layer 12 and ink-layer 13 are spread over this consequtively and then the assembly is dried. For the ink- layer 13, electric current transmission is conducted with high fidelity in the shape of electrode needle and, as it plays a role of transferring to a recording medium 2 after melting by a low energy, the melting viscosity is controlled within a range of 0.5-5,000 poise at 150 deg.C. Through this arrangement, thickening of dot and defective fixing are eliminated and a character of high density dot of excellent sharpness can be obtained.

Description

[Detailed description of the invention] J Rou Nihada The present invention relates to a recording material (ink sheet) for electrical transfer.

For more information on incline typewriters, see Silent Typewriters.
1 Printing for electronic calculation, 13. The present invention relates to a recording material for electrical transfer that is useful for printing records such as the output of a slave computer or a record of copy transmission.

BACKGROUND OF THE INVENTION As electronic computers, facsimile machines, and the like have gradually become more sophisticated, their terminal devices, printers, have also come to occupy an important position. This terminal device can be roughly divided into impact printers (mechanical printers) and non-impact printers, and the recording methods of the latter include (1) electrophotography, (2) thermal recording, and (3) electric discharge. Recording, (4) thermal transfer, and (5) electrical transfer are known. However, the former impact printer has a defect in that it cannot avoid the noise generated due to its mechanism.

On the other hand, the recording method used in the latter (non-ink printer) is also advantageous in that it does not generate noise, but has various problems.

In other words, in the electrophotographic method, the 5 steps of charging, photoluminescence, development, transfer, and cleaning are complicated, and there are drawbacks to the reliability of consistently obtaining high-quality transferred images and the downsizing of the equipment. be.

In the heat-sensitive recording method, there are still problems with the storage stability of the heat-sensitive recording material used therein, and the heat-sensitive recording material itself has the disadvantage that it is processed paper and plain paper cannot be used. The discharge recording method has the advantage of being able to perform discharge transfer onto plain paper, but
Disadvantages include the generation of odor and burnt residue due to discharge breakdown. In addition, since the thermal transfer method uses a thermal head, it is difficult to obtain high-density images (10 lines/mm degree is the limit), and the recording speed is slow (1 m5ec/mm degree is the limit).
There are drawbacks such as (limited to dot size).

Although it is the same non-impact printer method, unlike the above one, the electric transfer method (current transfer recording method) can obtain high-density images on plain paper, has a fast recording speed, and the equipment used for this method. It also has the advantage of being compact. For this reason, several proposals have been made regarding the current transfer material (recording material for current transfer) used in this method and further improvements to the method.

For example, JP-A-54-87234 discloses a colored material on a conductive substrate and a thermoplastic polymer that is soluble in a solvent that does not damage the substrate and has a softening point lower than that of the substrate. iUl provided with a transfer layer whose identity is resin
Electrotransfer materials have been proposed. Many other electrical transfer materials are known, but unfortunately only a few can produce high-quality images, or even if they do, they are unreliable.

Purpose The present invention has no thick dots or poor fixation, and has high density and sharp dots)! The object of the present invention is to provide a recording material for electrical transfer that can obtain characters of the same composition.

Structure The present invention arranges a recording medium and an electric transfer recording method in an overlapping manner,
The above-mentioned current transfer recording method is used in the current transfer recording method, in which a return electrode is brought into contact with the recording material, and a recording electrode needle is brought into contact with the narrow side of the recording material, and a voltage is applied to the recording material to transfer the ink onto the recording medium. The recording material consists of a base layer and an ink layer from the recording electrode side. ? It has a four-layer structure or a three-layer structure consisting of a base layer, an intermediate layer and an ink layer,
Moreover, the ink layer has a melt viscosity of 0.0 at 150'C.
It is characterized by being 5 to 5000 poise.

In addition, in the present invention, in practical use, it is preferable that the ink in the ink layer is in a softened state even if it is not melted by electricity supply, and that the viscosity thereof is in the range of 0.5 to 5000 poise at 150'C; It was completed based on the knowledge that results can be obtained.

In the following, the present invention will be explained in more detail with reference to the accompanying drawings. Figure 1 shows the base layer (B) 11 and the ink J.
Recording material of the present invention consisting of two layers 41j of 13
2 is a cross-sectional view of the base layer (B) 11, the intermediate Je (
M) 12 and an ink layer (13).
is provided as necessary.

The royal Ifuri Noh required for each layer is (a) Pace layer 11
The type that generates Joule heat with (b) ink/i13 differs in terms of instantaneous resistance (R), but these two types have something in common. The base layer 11 on the electrode needle side must be highly heat resistant to prevent heat damage and stylus staining, and the ink layer must have a melt viscosity in the range of 0.5 to 5000 poise at 150°C. It is.

In the recording material of the type (b) above, in which the intermediate layer 12 is provided, the intermediate layer 12 is more responsible for ignition than the base layer 11 and the ink layer 13, and therefore, in this case, The intermediate layer 12 includes at least a flexible film layer. Providing the intermediate layer 12 is advantageous in various respects, which will be understood more fully in the subsequent reading.

In order to fully exhibit the above functions, it is necessary for the electrical resistance (R) of each layer in the recording material shown in FIG. For type (b), it is necessary to set RB>J. On the other hand, in the recording material shown in FIG. 2, the electrical resistance (R) of each layer must be set to RM≧RI>RB or RI>RM>RB for the type (a), and ) type of RM
It is necessary to satisfy ≧RB > RI or RB > KM > RI.

Due to this relationship, particularly in the recording material shown in FIG. )@ll reduces the heat generated by the PACE J7ix and solves problems such as damage to the PACE J7ix and dirt on the stylus due to heat, as well as reducing contact resistance with the stylus, resulting in fewer drags and scratches.
In addition, the dot remains sharp because current flows concentratedly in the ink J't:+13 immediately below the stylus.

Also, if a material that is easily separated from the base layer 11 is used for the intermediate layer, J:4. ;Achieving the desired record of merit will result in Noh. That is, as shown in FIG. 3, when the heat generated by the current from the stylus 6 is concentrated directly below the stylus 6, only the portion of the intermediate peeling layer 12' where the heat is concentrated is peeled off from the base layer 11 and together with the ink layer 13. Transferred to recording body 2. This allows the dot quality to be sharp and uniform.

The materials forming each Rj are as follows.

For the base layer 11, it is desirable to use a sheet-like material in which Carlo black, which is a conductive agent, is dispersed in a binder component having a softening point or melting point of 150° C. or higher. As a binder here, yi'! Liquor YG nate resin, styrene resin, acrylic resin (methyl methacrylate, ethyl acrylate, n-butyl methacrylate, etc.),
Vinyl chloride thread resin (vinyl chloride-vinyl acetate copolymer,
Examples include agglomerated vinyl-vinylidene chloride copolymer), nylon, and polyvinyl butyral resin, but nylon and polycarbonate@fat are particularly preferred.

In addition, as the base layer 11, for example, Japanese Patent Publication No. 55-123
No. 94, JP-A-53-7246, JP-A-56-827
It is also possible to apply an anisotropically conductive paste layer or a metal dispersed current-carrying layer as found in publications such as No. 6 and Japanese Patent Publication No. 55-12393, but if manufacturing methods and other points are considered,
The above are preferred.

The intermediate M12C or intermediate release layer 12') has a softening point of 15
A resin with a temperature of 0°C or higher is suitable. If a resin with a softening point lower than 150°C is used, the film-forming ability will be low, and the sheet will not be strong enough and will soften or melt in the bath due to the heat generated when electricity is applied, resulting in the film-forming layer not being able to function as a film-forming layer. I can't do it.

Here, the trees) ji, 1' that can be used for the intermediate layer 12 include, for example, vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyritine chloride copolymer, thickened vinyl-acrylonitrile copolymer, acrylic transparent ester- Acrylonitrile copolymer, acrylic ester-vinylidene chloride copolymer,
Acrylic ester-styrene/copolymer, meccrylic ester-acrylonitrile copolymer, methacrylic ester-vinyritine copolymer, methacrylic ester-styrene copolymer, urethane elastomer, nylon-silicon resin, nitrocellulose - polyamide resin, polyvinyl fluoride, vinylidene chloride-acrylonitrile copolymer, butadiene-acrylonitrile copolymer,
Polyamide q*i sword, polyvinyl butyral, cellulose interferon (cellulose acetate butyrate, cellulose diacetate, cellulose triacetate, cellulose zolobionate, nitrocellulose, etc.), po')
styrene-butadiene copolymers, polyester resins, chlorovinyl ether acrylate copolymers, amine resins, various synthetic rubber-based thermoplastic resins, and mixtures thereof. In addition, cellulose acetate with a plasticizer added, yl? liquor inate,
Uncured polyester (fused tyzo), polyvinyl alcohol, nylon, styrene-butadiene copolymer (low styrene type), styrene-acrylic copolymer, styrene with plasticizer added, vinyl chloride-6'μ
Examples include acid vinyl copolymers, polyvinyl butyral, and those to which a flexibility imparting agent is added.

Examples of flexibility-imparting agents include tantalic acid esters, sulfuric acid esters, fatty acid esters, glycols, oils and fats.

In addition, for the middle 1ifl release layer 12', a resin with a release effect is selected for the purpose of aiding the transfer of ink.
, polyzolopyrene, fluorine-containing polymers, polyvinyl alcohol, polyester (vs. cellulose), cellulose thread resin (vs. polyester), branched silicone yarn, binder systems containing inorganic sensitized carbonates such as carbonized magnesium, chlorinated rubber, etc. A commercially available stripping agent (trade name: Chiron C: myristic chromic chloride) or the like can be used.

In the above-mentioned middle j so 12 (including the middle strip NrxjQ 12'), it is preferable to have a relatively high resistance (10 to 10 Ω) in order to generate heat there more effectively, and to make the dots sharp. It is preferable that the resistance be relatively low (10 to 10Ω).

On the other hand, the ink layer 13 preferably has a surface area of 200 r
5 to 30% by weight of carbon black, commonly referred to as conductive carbon, having rj/I or more is dispersed in a binder component of 70 to 9s base ms. If the amount of carbon black is less than 5% by weight, the resistance and current conduction will be insufficient, and if it is more than 30% by weight, the valley melt resistance at 150° C. will be 5000 voids or more.

Examples of cocotenohinder components include styrene,
Resins such as styrene-acrylic copolymer, styrene-butadiene copolymer, low-molecular polyethylene, ethylene-vinyl acetate copolymer, xylene resin, indencoumarone resin: carnauba wax, ester wax, polyethylene glycol, higher fatty acid Examples include waxes such as glycerin ester, wax/wax, and polycrystalline wax.

If necessary, an appropriate amount of an oily substance (vegetable oil such as linseed oil or castor oil; mineral lubricant such as motor oil or spindle oil) may be blended into the ink layer 13.

The ink layer 13 is energized according to the shape of the electrode needle (diameter and round shape)
Since it has the role of melting with low energy and transferring to the recording medium 2,
It is necessary that the melt viscosity at 150° C. is in the range of 0.5 to 5000 poise, preferably 1 to 20 poise.

If the viscosity is lower than 0.5 voise, it tends to cause background smudges, thick dots, and insufficient fixing (on the other hand, if the viscosity is higher than 5000 voise, the dot density will be low, and the ink will not transfer in some areas, resulting in blotches). The image quality will be better.

Further, a coloring component (the carbon black described above can also be a color component together with a heating agent) is added and dispersed in the ink layer 13;
Together with the binder -MB present around it, it constitutes a heat transfer ink. In addition to the above-mentioned carbon black, these coloring components include organic or inorganic color dyes such as phthalocyanine,
Examples include alkali blue, spirit black, benzidine yellow, fast red, crystal violet, ba-ka-yo, and ka-ka-cadmium.

When producing the recording material of the present invention, the base layer 11 and the ink layer 13 or the base layer 11 and the intermediate layer 12 (
In order to match the electrical resistance of each of the intermediate release layer 12' and the ink layer 13 to the above relationship, various organic or inorganic conductive materials are used in each layer 11, except for the anisotropically conductive paste layer. .12 (A suitable amount is added to 129 and 13. Examples of such conductive materials include 24J, conductive carbon black (which is also ideal as a coloring component), ordinary carbon black, graphite, oil black, etc. is given as a representative example.

In order to produce the recording material of the present invention, for example, (,
) After melting the base layer forming resin in a bath with heat of 200 to 3000 G, extrusion is performed through a T-shaped die to form a film (Pace Jt311
13. Make a layer (ink) on top of this.
．． (b) Apply the forming liquid for each layer (base layer, ink layer, intermediate layer or intermediate peeling layer) on a glass plate, metal plate, etc. and dry it.
It is sufficient if there is no need to remove the W coating from the glass plate, metal plate, etc. in one piece after drying.

In particular, the ink layer 13 is formed by dispersing carbon black and a binder component as essential components in a solvent such as wotluene, methyl ethyl ketone, or cyclohexane using a Zeel mill, and then coating the ink layer using a blade or wire bar code method, or applying the mixture under heating. The mixture may be milled using a homo mixer, universal mill, roll mill, etc., and then hot-melt coated to a thickness of 1 to 10 μm.

In order to conduct current transfer recording using the recording material for traditional Buddhist photography produced in this way, ink JvJ13 is leaked into the recording body 2 and the intermediate layer 1 is
2 (or intermediate printing) through the adhesive layer 12')
This is carried out by bringing the return electrode 4 into contact with the pace N11, and by applying a current signal with a recording applied voltage of 5 to the pace N11 through the recording needle 3 as shown by the recording current 6 indicated by the arrow. In the case of (b) above].

When the recording material 1' is energized, the current density directly below the recording needle is maximum, and since the return electrode 4 has a larger contact area than the recording needle 3, the current spreads as it approaches the return electrode 4 and the current density becomes smaller. Become. The Joule heat generated by this energization softens or melts the ink and transfers it to the recording medium 2. Here, It! corresponding to the current signal is displayed on the recording body 2. 1If7 is formed.

The conditions of energization, the number of scanning lines, etc. have a great influence on image formation, but generally they are 10 to 200 cm, the electric current time is 0.05 to 1 hour, and the number of scanning lines is about 3 to 20 lines/field. The recording material 1 and the recording body 2 are completely stirred. In the recording medium of the present invention, even when a relatively strong current is applied, all of the coloring components are not transferred onto the recording medium 2', so that it can be used repeatedly.

The above-described current transfer recording method uses a recording material 1' shown in FIG.
Although the explanation is based on the recording material 1 shown in FIG.
The same applies to

Example 1 Low molecular weight polystyrene (molecular weight approximately 400) So parts by weight Conductive carbon (surface Aλ approximately 1000rr17J) 2
A mixture consisting of 900 parts by weight of 0 ice parts cyclohexane was dispersed in a whole mill for 24 hours, and then the mixture was cut into pieces with a thickness of about 15 μm and a resistance of 20 Ω (using Yokogawa Electric Corporation Tester TYPE 3201). The value was measured at the middle and large part of the ribbon, with a spacing of 1. I used an ink ribbon (recording material) with an overall resistance of 5Ω.The ink layer of this material was 15Ω.
The melt viscosity at 0° C. was 4500 voids.

Subsequently, using this ink ribbon, recording was carried out using a multi-stylus in which recording electrodes each having a diameter of 60 μm were arranged in a staggered manner under conditions of a signal voltage of 150 V and an application time of 0.1 m5 ec. The results are summarized in Figure 1.

Example 2 An ink sheet (recording material) was prepared in the same manner as in Example 1, except that a nylon film having a thickness of about 20 μm and a resistance of 50 Ω was used as the base layer. however,
The length of the ink layer of this product is approximately 5μ, the resistance of the entire ink sheet is IOKΩ, and the ink layer is approximately 150Ω.
The bath melt viscosity at °C was 1 void.

Next, this ink sheet was used in the same manner as in Example 1 (however, the signal voltage was 120 V, the application time was 0.1 m5ec)
And so. ) was recorded. The results are summarized in Table-1.

Example 3 An inkridan (recording material) was prepared in the same manner as in Example 1 except that the following was used as the ink layer composition. However, the thickness of the ink layer of this product is about 5μ, the resistance of the entire ribbon is about 7Ω, and
The ink layer has a melt viscosity of 2000 voids at 150°C.

Subsequently, recording was performed in the same manner as in Example 1 using this ink ribbon. The results are summarized in Table 1.

Comparative Example 1 An ink ribbon (recording material) was produced in the same manner as in Example 1, except that Comparative Example 1 was used as the ink layer composition. However, the thickness of the ink layer of this product is about 5μ, the resistance of the entire sink is about 2Ω, and
Ink M had a melt viscosity of 7000 poise at 150°C.

Recording was then carried out in the same manner as in Example 1 using this in-clean. The results are summarized in 6-1.

Comparative Example 2 An inkridan (recording material) was prepared in the same manner as in Example 1 except that Ink I was used as the lead composition. However, the thickness of the ink layer of this product was about 5 μm, the resistance of the entire ribbon was IOKΩ, and the ink layer had a bath melt viscosity of 0.52 Is at 150° C.

Next, this in clean? Recording was carried out in the same manner as in Example i+l11 using a 1000 yen lens. The results are summarized in Figure 1.

(Margin below) Note: ○ means good, △ means Shinnobu, × means bad.

Efficacy As described above, by using the recording material of the present invention, a high quality image can be quickly printed on a recording medium such as plain paper with low recording energy. This is because the recording material has a two-layer structure consisting of a base layer and an ink layer, or a three-layer structure consisting of a base layer, an intermediate layer, and an ink layer, and the functions of each layer are separated. It has become clear that superior image quality can be obtained by using a certain intermediate release layer.

Furthermore, in the recording material of the present invention, by forming an ink layer with specific properties, recorded matter of even higher quality can be obtained.

Note that if a uniformly dispersed layer simply containing a conductive material as shown in the examples is used as the base layer, the composition is completely different from that of the anisotropic conductive paste layer. However, it is also advantageous in obtaining high-quality dot records.

[Brief explanation of the drawing]

1 and 2 are sectional views of two sides of a recording material according to the present invention, and FIG. 3 is a diagram showing an outline of recording.

Claims (1)

[Claims] 1. A recording body and a recording material for electrical transfer are placed one on top of the other,
Used in the current transfer recording method, in which a return electrode is brought into contact with the recording material and a recording electrode needle is brought into contact with the narrow side of the recording material, and a voltage is applied to energize the recording material, thereby transferring ink onto the recording medium. The recording material has a two-layer structure consisting of a pace layer and an ink layer, or a three-layer structure consisting of a pace layer, an intermediate layer, and an ink layer from the recording housing pole side, and the ink layer has a bath melt viscosity at 150°C. 0.5~5
A recording material for electrical transfer characterized by having 00θ voids. 2. The ink layer is carbon black with a surface area of 200 g/I or more from 5 to 30 m! % and binder component 70-9
The recording material according to claim 1, which contains a 5N short chip as a main component.