JPH05330253A - Receiving material - Google Patents

Abstract

PURPOSE:To prevent the omission of data by the superposition of a detection mark and an image after image formation by providing the detection mark on at least one surface of a base material so as to be capable of erasing the same by heat and/or light. CONSTITUTION:A registering detection mark 3 erased by heat and/or light is provided on one surface of a base material 2 composed of a polyolefinic material. This detection mark 3 is formed from a compsn. wherein fine crystals of a liquid crystal are dispersed in a polymeric substance and the liquid crystal becomes transparent by heating, a compsn. wherein a liquid crystal is arranged in a polymeric substance at random and transparentized by changing the arrangement state of the liquid crystal by a magnetic field or a compsn. consisting of a polymeric substance and fatty acid and transparentized by the change of the crystal structure of fatty acid due to heat energy. As a substance due to light, a photochromic substance, for example, a spiropyrane or spirooxazine type compd. is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium, and more particularly to a recording medium provided with a detection mark used for registering during recording.

[0002]

2. Description of the Related Art In recent years, colorization has progressed in output printing of computers and word processors, copying, output to OHP film, and the like. For example, when color printing is performed on a recording medium such as an OHP film by a thermal transfer method, a recording agent layer made of a heat-fusible ink or a recording agent layer containing a sublimable dye is formed on one surface of a substrate film. A thermal transfer sheet is used.

Color printing and image formation using such a thermal transfer sheet are carried out by stacking a recording material layer and a recording medium and heating them from the back side of the substrate film with a thermal head. In this case, the recording material layer contains colorants of various colors such as cyan, magenta, yellow and black, and an image for each color is formed in the same region of the recording medium in a predetermined color order. Therefore, in order to form a clear image by forming an image for each color at an accurate position, the recording medium is provided with a detection mark used for registration in advance.

In color electrophotography, it is necessary to superimpose toner images of three colors, cyan, magenta, and yellow, on the recording medium efficiently without causing displacement. For this reason, the recording medium is previously provided with a detection mark used for registration as in the above case.

[0005]

However, even though the above-described detection mark is unnecessary after image formation, it still exists after image formation, so that the detection mark and the formed image overlap. , There were cases where information was lost. Even if a detection mark is formed outside the image forming area of the recording medium in order to prevent such information loss,
When the recording medium is transparent like an OHP film, when the recording medium is placed on an OHP device and used, the detection mark existing outside the image forming area is also projected, and the projection screen is displayed. There was also the problem that extra images would get in.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a recording medium provided with a detection mark which can be erased after recording.

[0007]

In order to achieve such an object, the present invention comprises a base material and a detection mark formed on at least one surface of the base material, wherein the detection mark includes heat and It is configured such that it can be erased by light.

[0008]

When the recording is performed on the base material of the recording medium having the detection mark on at least one side and the detection mark can be erased by heat and / or light, the recording and / or the fixing are performed. The detection mark is erased by heat, light, or light during use. As a result, recording on the recording medium becomes possible without considering the presence of the detection mark.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view of an embodiment of the recording medium of the present invention. In FIG. 1, a recording medium 1 includes a base material 2,
It has a detection mark 3 formed on one surface of the base film 2.

The base material 2 is not particularly limited, and is, for example, a polyolefin-based or polystyrene-based synthetic paper, high-quality paper, art paper, coated paper, cast coated paper, wallpaper, backing paper, synthetic resin-impregnated paper, emulsion-impregnated paper. Various papers such as paper, synthetic rubber latex impregnated paper, synthetic resin internal paper, paperboard, etc., cellulose fiber paper, polyolefin, polyvinyl chloride, polyethylene terephthalate, polystyrene, polymethacrylate, polycarbonate, cellophane, cellulose acetate, etc. Is preferably used. Further, a white opaque film formed by adding a white pigment or a filler to the above synthetic resin, a foamed sheet, or the like can also be used as the substrate 2. Further, these composites can be used as a base sheet,
Examples thereof include a laminated body of cellulose fiber paper and synthetic paper, and cellulose fiber paper and plastic film.

The thickness of such a base material 2 can be appropriately determined depending on the recording means, required strength, etc., and is, for example, about 10 to 300 μm. The detection mark 3 is provided in order to obtain a clear image in which an image for each color is formed at an accurate position in color image formation or the like,
Registration is performed by utilizing the fact that the reflectance and / or the transmittance of the light emitted from the sensor is different between the detection mark 3 portion and the portion where the detection mark 3 is not formed.

In the present invention, the detection mark 3 can be erased by heat and / or light. Examples of the material used for forming the detection mark 3 include the following. I. Material that becomes transparent by heat: (1) Combination of polymer substance and liquid crystal: When the liquid crystal becomes fine crystals and is dispersed, it becomes cloudy and visible, and when heated, the polymer substance and liquid crystal become carboxylic acid. It becomes a molecular dispersion state (transparent) through. Alternatively, the liquid crystal component dispersed in the polymer, such as PDLC, changes from being randomly arranged to being arranged in a certain direction by a magnetic field or the like, thereby changing from opaque to transparent. (2) Combination of polymer substance and fatty acid: The crystal structure of the fatty acid dispersed in the polymer is changed by the given thermal energy, so that the opaque state is changed to the transparent state.

Polymer materials that can be used: polyester,
Vinyl chloride / vinyl acetate copolymer, polyvinyl chloride, polyvinylidene chloride, acrylic resin, etc.

Fatty acids that can be used: saturated monocarboxylic acids such as stearic acid and behenic acid, saturated dicarboxylic acids, saturated carboxylic acid esters, etc. (3) Combination of two or more kinds of polymer substances: Polymer blend systems that are visible in a phase-separated state and become transparent when given heat energy are considered. This includes LCST (Lower Crit
ical Solution Temperature type and UCST (Upper
Two types of blend system of Critiacl Solution Temperature type are considered. (4) Organic substance that changes its phase by heating and becomes transparent:
Vezenthiol / divinylbenzene copolymer, isophthalamide derivative, etc. (5) Polymeric substance that changes its structure by heating to become transparent: styrene / butadiene block copolymer, styrene / isoprene block copolymer, styrene / ethylene /
Addition of fatty acids such as stearic acid to butadiene block copolymers, styrene / ethylene / propylene block copolymers. (6) Substances that become transparent by changing the surface shape (matte → smooth) by heating: Polyester resins, polyolefin resins such as polyethylene and polypropylene, halogenated resins, acrylic resins, vinyl resins, polystyrene resins A mat-like surface is obtained by coating the above with fine particles of about 1 to 100 μm. (7) Dye that decomposes or changes structure when heated:
An azo dye such as diazo or trisazo, an indole dye such as indophenol or indonaphthol, a phthalocyanine dye or the like is melted or dispersed in a resin. (8) Inclusion compound that decomposes or separates by heating: A compound in which a halogen such as iodine or a dichroic dye is included as a guest in a host such as polyvinyl alcohol, starch, or α-cyclodextrin. (9) Combination of dye and decoloring agent: The dye and decoloring agent are coated in multiple layers or microencapsulated, and when heated, the dye and the decoloring agent react and become transparent. As a typical example, a method utilizing the redox reaction of a leuco dye can be considered. (10) Foamable (porous) resin or microcapsule-forming resin: Visible in a foamed (porous) state or a microcapsule state, and becomes transparent by defoaming (defoaming) or destruction of the microcapsules by heating. Become.

Foamable (porous) resin that can be used: styrene resin, urethane resin, polyvinyl formal, polyvinyl chloride, polyethylene, polyester, polyether, cellulose derivative, rubber material, polypropylene, epoxy resin, etc. II. Material that becomes transparent by light: (11) Photochromic substance: Decolorized by irradiation light only when the transparent recording medium such as OHP is irradiated with light.

Photochromic substances that can be used: spiropyrans, spirooxazines, anthracenes, fulgides, azos, phthalocyanines, porphyrins, triarylmethanes, dienes, aromatic olefins, etc.

The position, shape, number, etc. of the detection marks 3 formed of the above-mentioned materials on the base material 2 are not particularly limited, and are arbitrarily determined according to the image forming means (printing means). be able to.

In the present invention, the image forming surface of the substrate 2 may be subjected to processing for facilitating image formation and for maintaining the formed image. For example, in the case of a sublimation thermal transfer method using a thermal transfer sheet on which a recording material layer containing a sublimable dye is formed, the sublimable dye transferred from the thermal transfer sheet is received to maintain the formed image. A dye receiving layer can be formed.

The resin for forming the dye receiving layer is, for example, a polyolefin resin such as polypropylene,
Halogenated polymers such as polyvinyl chloride and polyvinylidene chloride, vinyl polymers such as polyvinyl acetate and polyacrylic ester, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polystyrene resins, polyamide resins, ethylene and propylene, etc. Examples thereof include copolymer resins of olefins and other vinyl monomers, ionomers, cellulose resins such as cellulose diacetate, polycarbonates and the like, and vinyl resins and polyester resins are particularly preferable.

The dye-receptive layer is prepared by dissolving or dispersing, in a suitable solvent, a resin obtained by adding additives to the above-mentioned resin, and coating and drying the ink on a substrate by a known means. Formed. The thickness of the dye receiving layer is preferably about 1 to 20 μm.

The dye receiving layer may be provided on either the same surface as the surface provided with the detection mark or the opposite surface. When provided on the same surface as the detection mark, the dye receiving layer may be provided on the detection mark, or the detection mark may be provided on the dye receiving layer.

When a transparent plastic film for an OHP sheet is used as the base material 2, an antifogging agent may be applied to at least one surface of the base material 2. As the base material 2 used for electrophotography, one having water-soluble resin such as polyvinyl alcohol coated on both sides to improve smoothness and prevent curling, and a conductive agent such as sodium chloride are added to obtain a suitable electric conductivity. It is possible to use a device having a resistance.

Next, the present invention will be described in more detail with reference to experimental examples. (Experimental Example 1) A detection mark coating solution having the following composition was gravure roll coated at a predetermined position outside the image forming area on the surface of polyethylene terephthalate (Lumirror manufactured by Toray Industries, Inc.) having a thickness of 100 μm as a substrate. (Coating amount = 5.0 g / m ² (when dried)) to form a detection mark, and the OHP sheet (sample-
1) was obtained.

(Composition of coating liquid for detection mark) • Polyvinyl chloride / vinyl acetate copolymer: 20 parts by weight • Linear monocarboxylic acid: 1 part by weight • Linear dicarboxylic acid: 1 part by weight • Tetrahydrofuran 100 parts by weight (Experimental example 2) OHP sheet which is a recording medium of the present invention in the same manner as in Experimental example 1 except that a porous layer was formed by using a coating liquid having the following composition as a detection mark coating liquid. (Sample-2) was obtained. (Composition of coating liquid for detection mark) Polyethylene resin: 100 parts Foaming agent: 7 parts Crosslinking agent: 5 parts The above OHP sheets (Samples 1 and 2) are printed with a color laser copier manufactured by Canon Inc. Then, the detection mark was made transparent by the heat of the fixing roller. After that, the OHP sheet (Sample-1, 2) on which the image is formed is OHP
As a result of being placed on the device and projecting, the detection mark in the transparent state was not projected, but only the image information was projected.

[0025]

As described above in detail, according to the present invention, since the detection mark can be erased by heat and / or light, the detection mark can be detected by heat, light during recording, or light during use. Is erased, the detection mark and the recorded image are prevented from overlapping with each other, and the detection mark is prevented from being projected on the OHP, so that the recording can be performed on the recording medium without considering the existence of the detection mark.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an embodiment of a recording medium of the present invention.

[Explanation of symbols]

 1 ... Recorded material 2 ... Substrate 3 ... Detection mark

Claims (1)

[Claims] 1. A base material and a detection mark formed on at least one surface of the base material, wherein the detection mark is erasable by heat and / or light. Record body.