JPS5919192A - Multicolor pressure sensitive copy material - Google Patents

Abstract

PURPOSE:To provide an ink release type multicolor pressure sensitive copy material capable of selecting printing color tone by the change of printing pressure, obtained by a method wherein a film substrate and an ink layer based on resin, non-compatible oil and a coloring material are included and the ink layer is formed by laminating inks having plural color tones. CONSTITUTION:An ink release layer 3(a first ink release layer) containing a low pressure printing ink component resin (e.g., a vinyl chloride/vinyl acetate copolymer), non-compatible oil (e.g., spindle oil) and a coloring material and an ink release layer 4(a second ink release layer) containing a high pressure printing ink component are provided on a film substrate pref. in each thickness of 10- 20mum as an ink layer 2 and for example, an intermediate layer (e.g., acrylic resin) 5 is further provided between the first ink release layer 3 and the second ink release layer 4 to form an objective copy material. Resin and a solvent may be changed in each layer without providing the intermediate layer and the size of the pole provided to the ink layer may be changed to vary a sponge structure.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multicolor pressure-sensitive copying material, and more particularly to an ink-release type pressure-sensitive copying material whose printing color tone can be selected by changing printing pressure.

In general, ink-releasing pressure-sensitive copying materials are made of linear polyester, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, polyurethane, acrylic resin, etc. An adhesive layer having a thickness of several micrometers is provided, and an ink containing a resin, an oil incompatible with the resin, and a coloring substance as main components is provided on the adhesive layer. This ink m has a trousers:)t II structure, and contains ink made of oil and coloring substances in the holes of a resin sponge. When pressure is applied from the back, the ink will pop out and be transferred, usually about 3 to 6 times. It is called a multi-strike ink ribbon because the print density does not decrease much even if it is struck at the same location. However, the conventional ink-release type pressure-sensitive copying material has the inconvenience of not being able to freely select the print color tone because it only has a monochrome function.

The object of the present invention is to obtain multicolor printed images from the same copying material by changing the printing pressure.

The multicolor pressure-sensitive copying material of the present invention includes a film base material, a resin, an ink layer mainly composed of an oil and a coloring material that are poorly compatible with the resin, and the ink layer has two or more types of color tones. It is characterized by being laminated.

Further, in the pressure-sensitive copying material of the present invention, an adhesive layer can be provided on the base material, if necessary.

Next, the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a conceptual diagram showing the basic structure of the multicolor pressure-sensitive copying material of the present invention, which has the same structure as a conventional monochrome copying material in that an ink layer 2 is provided on a film base 1. Ink layer 2
is the ink release layer 3 containing ink components for low pressure printing (W, 1
This ink release layer) and the ink release layer 4 containing an ink component for high-pressure printing (second ink release layer) are laminated, and this point is characteristic. As shown in FIG. 3, during low pressure printing (A), only the ink in the upper first ink release layer is released, while during high pressure printing (during high pressure printing), the ink in the upper first ink release layer is released. Since they are emitted at the same time, the print color tone can be changed as desired.

In the pressure-sensitive copying material of the present invention, spindle oil, liquid rough-in oil, mineral oil such as Mobil 1, animal oil such as lard or lanolin, or vegetable oil such as castor oil or peanut oil may be used. I can do it. In addition, low-pressure and high-pressure colorants can be arbitrarily selected, and black colors include carbon black, iron oxide, and nigrosine base, evening colors include alkali blue, ginonine blue, and still red colors. As for permanent red,
Lake Red and other yellow-based colors such as Toshiteha Hanri' Yellow and Nomie Manent Yellow are added to green-based colors °C
Phthalocyanine green, brilliant green, etc. can be used. Known dispersants may be used to adsorb the pigments to the oil. In the present invention, the low pressure and high pressure ink release components are prepared separately.

First, the above-mentioned oil, colorant, dispersant, dispersion medium, etc. are put into a ball mill and dispersed for about 24 hours to make ink. This ink is taken out from the ball mill and a resin is mixed into it to prepare an ink liquid. Note that the resin may be mixed into the ball mill from the beginning. As the resin used for the ink, a resin that is easily formed into a resin that has poor compatibility with oil is required. Generally, vinyl chloride-vinyl acetate copolymer, polycarbonate, etc., which contain a large amount of vinyl chloride, are used.

The biggest problem in forming the ink layer into a laminated structure as in the present invention is that when the first ink layer is formed and then the second ink layer is formed, the first ink layer is The two layers mix due to swelling or dissolution, and as a result, the printed color tone becomes unclear. In order to eliminate such problems, the following measures have been taken in the present invention.

1. As shown in FIG. 2, an intermediate INS is provided between the first ink release layer 3 and the second ink release layer 4.

2. The types of resins used in the first ink release layer 3 and the second ink release layer 4 are changed to make it difficult for the solvent used to coat the first ink release layer 3 to dissolve the second ink release layer 4. That is, pay attention to the selection of resins and solvents used. for example,
If a vinyl chloride-vinyl acetate copolymer is used as the resin for the first ink release layer, and polycarbonate is used as the resin for the second ink release layer, the solvent for the second ink release layer may be used as the solvent for the first ink release layer. Methyl ethyl ketone, which does not dissolve the polycarbonate resin, is used.

5. Changing the sponge structure of the first ink release layer 3 and the second ink release layer 4, that is, changing the size of the holes in the ink layer. For example, the size of the holes in the second ink release layer 4 may be reduced (
By making the resin rich by adding about 1 to 2 μm), it is possible to prevent ink from entering the second ink release layer 4. As a method of changing the hole size, for example, if the compatibility between oil and resin is deteriorated, or if a low viscosity oil is used and the ratio of oil to resin is increased, the hole size will become larger, and vice versa. By improving the compatibility between oil and resin, using high viscosity oil, and reducing the ratio of oil to resin, the hole size can be reduced.

The multicolor pressure-sensitive copying material of the present invention can basically be produced by known methods. For example, the ink liquid prepared as described above is sequentially applied onto a 7 μm thick polyester film using a wire/ζ- or the like to form an ink layer.

As for the order of application, first the high-pressure printing ink liquid is applied, then the low-pressure printing ink liquid is applied, and the respective ink layers can be laminated. The thickness of each layer is 5 to 25 microns, preferably 10 to 20 microns. At this time, in order to prevent the first ink release layer and the second ink release layer from being mixed, an intermediate layer may be provided therebetween as described above. This intermediate layer may be made of acrylic resin, vinyl chloride-vinyl acetate copolymer, butyral resin, or the like. Adhesion speed 0.5 to 3 f
/ m2 is preferably 1 to 2 /'m2. Further, if necessary, an acrylic resin or vinyl chloride-vinyl acetate copolymer may be provided as an adhesive between the first ink emitting layer and the polyester base.The present invention will be explained with reference to Example T1. However, it is not limited to this. In the examples, all parts are indicated by weighted parts.

Example 1 ←) Ink components for high-pressure printing Castor oil (Nissin Oil Co., Ltd.) 10 parts Carbon black (Degussa) 3〃Lupuriseal 6406 1# Methylene chloride
100″ pan light-130010
11 (Teijin Ijo Polycarbonate) (b) Low-pressure printing ink components Spind 7 oil (Mobil KjK) 10 Sounds 11 Cyanine Blue (Dainichi Seiki) 3 Methyl ethyl ketone 50 Eslec 07 (Tanesui Chemical chloride vinyl acetate resin 87) :1) Each of the above ink components was put into a separate ball mill, dispersed for 24 hours, and then taken out from the ball mill to prepare two types of ink liquids.

First, 7ffl of the above ink was applied onto a 7μ polyester film and dried to obtain an ink layer of 1097m2. After that, the ink liquid of (b) above was applied on this ink layer and dried to form an ink layer of 8 f/m2. This feeling [copying rate is applied to a commercially available printer (Ricoh RP-1)]
600 (with printing pressure changeover switch) was used for printing tests. First, when 141 characters were printed at low printing pressure (LθW), a color-developed tone image was obtained, and then when printed at high printing pressure (Ilight), the black tone side i! 1r was obtained. Both images were crisp and clear.

Example 2 (a) High-pressure printing ink component lanolin (Daiichi 70-Da Chemicals) 10
Carbon black (Deg Lee) 3/
/Loop reseal 6406 (same as left) 0.4//
Methyl ethyl chloride 30" Esresoku C (Building Chemical) 7 (b) Low pressure printing ink component liquid paraffin (domestic printing) 15 parts Nog-
Manent Red (Dainichiseika) 6 Methyl Ethyl
Reketone 20〃Toluene
25〃ESLETSUKU C-5 (Building block writing) 10〃 Each of the above ink components was put into a separate ball mill and dispersed for 24 hours to obtain an ink layer coating liquid.

First, apply the ink liquid in (a) above using a wire spar, and the amount of adhesion after drying is 6? /m2.

Next, a 5% toluene solution of Eslec O-5 was applied onto this with a wire bar and dried.

The amount of adhesion was 1 f/m2. Next, the ink liquid of (b) above was applied on this ink layer and dried to 797 m2.
An ink layer was obtained. With this pressure-sensitive copying material, it was possible to obtain a clear red image at low pressure (Lqw) and a black image at high pressure.

6 E! Regarding the ink layer having a two-layer laminated structure, the present invention will be described as follows. However, it goes without saying that a multilayer structure with two or more layers can be implemented in the same manner as in the case of two layers.

The multicolor copy material of the present invention constructed as described above can print multicolor images from the same copy material by virtue of the printing pressure.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram showing the basic structure of the multicolor pressure-sensitive copying material of the present invention, and FIG. 2 is a conceptual diagram showing another structure of the multicolor pressure-sensitive copying material of the present invention. FIG. 3 is a schematic diagram showing the state of ink release when printing pressure is applied to the multicolor pressure-sensitive copying material of the present invention. DESCRIPTION OF SYMBOLS 1... Film base material, 2... Ink layer, 3... Ink release layer containing an ink component for low pressure printing (first ink release #), 4... Ink release layer containing an ink component for high pressure printing ( Second ink discharge M), 5... intermediate rr1, A...
Low printing pressure, B...high printing pressure. Patent applicant Rico Co., Ltd. m-52) Figure 1 Figure 2 Figure 3 Figure 8 B-

Claims (1)

[Claims] It is characterized in that it includes a film base material, a resin, an ink layer whose main components are an oil and a colorant that are poorly compatible with the resin, and the ink layer is laminated with inks having two or more color tones. Multicolor pressure-sensitive copying material.