JPS60112484A - Image-receiving material - Google Patents

Abstract

PURPOSE:To obtain a color developer having excellent color-developing property, heat resistance and transparency, by a method wherein a color forming layer comprising silicon dioxide having a pH of not higher than 6 as a main constituent finely dispersed in a binder and made to be transparent is provided on a base. CONSTITUTION:The color forming layer 3 comprising silicon dioxide 2 having a pH of not higher than 6 as a main constituent is provided on the base 1 to provide the image-receiving material. For example, a wood free paper, an art paper or the like having high brightness is preferably used as the base 1 for an reflective image such as document, while a sheet of vinylon, cellophane, acetyl cellulose or the like having excellent transparency and heat resistance is preferably used as the base 1 for a transparency image such as a slide. The color formimg layer 3 can be made to be transparent by applying a material obtained by finely dispersing silicon dioxide in a binder to the base 1 by a bar coater method or the like. In this case, the particle diameter of silicon dioxide is preferably not larger than 0.1mum, and, for example, colloidal silicon is preferably used.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image receptor used for image recording in electrophotography or printers. Specifically, the present invention relates to an image receptor useful for image recording using a single dye as an inking material.

Page 2 Structure of conventional example and its problems Various image recording methods using a single dye as an inking material have been proposed in the past. For example, there is a one-shot electrophotographic method using light-transmitting particles containing a sublimable color former disclosed in Japanese Patent Publication No. 56-49307, and a color sheeter heating element in which a sublimable dye is coated on capacitor paper or the like. There is a sublimation transfer method in which the sublimated dye is colored on the image receptor, and furthermore, a sublimable dye gas is electrically controlled to be sprayed onto the image receptor as disclosed in Japanese Patent Publication No. 66-2020. There are gas jet recording methods to obtain images.

In order to obtain a clear dye image with any of the methods explained above,
It is necessary to make the dye into a molecular form on the image receptor and to develop the color uniformly. Therefore, an image receptor carrying a dye developer is usually used. Conventionally, as such an image receptor, a pressure-sensitive recording bottom paper using activated clay as a color developer has been used.

However, with bottom paper, the color purity of the dye image is poor due to the following reasons: (1) the activated clay is colored light brown, and @) the active clay has poor transparency, making the coloring layer opaque. There was a problem with the decline. Therefore, it was particularly unsuitable for color recording.

OBJECTS OF THE INVENTION It is an object of the present invention to provide an overall image receptor that overcomes these conventional problems. Specifically, the object of the present invention is to provide an image receptor useful for image recording using a dye alone as an inking material. Another object of the invention is to provide an image receptor useful for color recording. Another object of the present invention is to provide an image receptor in which the color forming layer containing a color developer is transparent. Furthermore, another object of the present invention is color development.

An object of the present invention is to provide a color developer with excellent heat resistance and transparency.

Structure of the Invention The image receptor of the present invention has a structure in which a color-forming layer containing silicon dioxide as a main component with a pH of 6 or less is provided on a substrate, and the color-forming layer has the effect of uniformly coloring the simple substance of the dye in the form of a molecule. It is something that you have.

DESCRIPTION OF THE EMBODIMENTS The image receptor of the present invention is characterized by a dye developer. That is, it is characterized in that silicon dioxide with a pH of 6 or less is used as a color developer.

Next, the image receptor according to the present invention will be explained in detail based on the drawings. The figure is a schematic cross-sectional view showing one embodiment of an image receptor according to the invention. A coloring layer 3 whose main component is silicon dioxide 2 having a pH of 6 or less is supported on a substrate 1.

Various materials can be applied to the substrate 1 depending on the purpose of use.

For example, high-quality paper or art paper with a high degree of whiteness is suitable for reflective images on documents. Furthermore, for transparent images such as slides, plastic sheets such as vinylon, cellophane, and acetyl cellulose, which have excellent transparency and heat resistance, are suitable. The coloring layer 3 can be made transparent by coating silicon dioxide finely dispersed in a binder onto the substrate 1 using a conventional method such as a bar coater. In this case, the particle size of silicon dioxide is preferably 0.1 micron or less. For example, colloidal silica is suitable for this purpose.

The binder preferably has a strong binding force, is transparent, and has excellent dispersion of 6/di-silicon dioxide. For example, styrene-butadiene copolymer, ethyl cellulose, acrylic resin, etc. are preferred. In particular, styrene-butadiene copolymer
When heated together with silicon dioxide, it crosslinks and improves heat resistance, so it is particularly suitable for applications in which image receptors are heated.

In order to improve the coloring efficiency of the dye, it is better to make the coloring layer porous so that the dye can be easily adsorbed to silicon dioxide. For this purpose, the amount of the binder added is preferably 30% by weight or less based on silicon dioxide.

The coating amount of the coloring layer required to sufficiently develop the color of the dye varies depending on the dye used, but is suitably from 1 to 1097 n/.

Additionally, it goes without saying that a dispersant may be added when silicon dioxide is dispersed in a binder, or an antioxidant or quencher may be added to the coloring layer to prevent fading of the dye, if necessary. It is. Furthermore, a known electron-accepting substance such as an organic acid or an inorganic acid may be used in combination with silicon dioxide as a color development aid.

Example 1 The following mixture was sufficiently stirred and mixed in a lamixer to obtain a coloring layer solution.

Color developer: silicon dioxide (colloidal silica manufactured by Nissan Chemical ■Snowtex OJ (pH 2-4, solid content weight 20%)...
...100 parts by weight Binder: Styrene-butadiene copolymer (manufactured by Nippon Sail-7■
"Danbond" (solid content 40% by weight) 6 parts by weight of this coloring layer liquid was coated on art paper (69/nf <coating amount after drying) to form an image receptor A for reflective images. Obtained.

Example 2 The color forming layer solution of Example 1 was applied to a vinylon sheet in an amount of 6 g/door to obtain a Bi image receptor for transmission images. The transmittance of the image receptor was 90%.

Example 3 A mixture of the following formulation was sufficiently dispersed with an attritor to give 7/・-
This was used as a dicoloring layer solution.

Color developer: Silicon dioxide (Fine Seal T-32j manufactured by Tokuyama Soda)
(pHe) ) --・-1oo parts by weight Binder: Ethyl cellulose... 1o weight! Solvent: Methylene chloride 100 parts by weight This coloring layer solution was coated on high-quality paper in an amount of 89/fold (coating amount after drying) to obtain an image receptor C2 for reflective images.

Experiment 1 Yellow disperse dye (PT-52Y manufactured by Mitsubishi Chemical Corporation)
, magenta basic dye (C,1, Basic Red 9
) and magenta sublimable color former (7'-diethylamino-1,3,3,5-tetramethyl-indolinobenzospiropyran) were applied to 15 micron thick capacitor paper using ethylcellulose as a binder. engineered,
Three types of colors (D, E, and Fi) are available. Next, the image receptor obtained in the example and the color sheet were overlapped, and
°C for 15 seconds, IK? /ca, a clear yellow and magenta colored image as shown in Table 1 was obtained on the image receptor. The numbers in the table indicate color density.

Table 1 * indicates transmission density.

Experiment 2 When color sheet F was superimposed on the yellow colored image obtained using color sheet D & in experiment 1 and heated under the same conditions as experiment 1, a clear red colored image as shown in Table 2 was obtained. Obtained.

9 pages Table 2 * indicates transmission density.

As described in detail, the image receptor of the present invention uses silicon dioxide, which has excellent transparency, as a color developer, so that the coloring layer can be made transparent. Therefore, the dye developed in the lower part of the coloring layer is not hidden by the upper color developer and the coloring density is reduced, and the entire coloring layer becomes a colored transparent body, which has the effect of obtaining a dye image with high coloring density. be. In addition, since the coloring layer can be made transparent, it is possible to easily obtain transmission type images by using a transparent substrate.In addition, silicon dioxide is colorless and heat resistant, so it does not yellow due to heat. 0.10 pcm, which has the effect of obtaining a dye image with high color purity.

[Brief explanation of drawings]

The figure is a schematic cross-sectional view showing one embodiment of the image receptor of the present invention. 1...Substrate, 2...Silicon dioxide, 3.
...Color forming layer.

Claims (4)

[Claims] (1) An image receptor characterized in that a color-forming layer containing silicon dioxide as a main component with a pH of less than 100% is provided on a substrate. (2) The image receptor according to claim 1, wherein in the coloring layer, silicon dioxide is finely dispersed in a binder and is made transparent. (3) The image receptor according to claim 2, wherein the amount of the binder is 30% by weight or less based on silicon dioxide. (4) The image receptor according to claim 3, wherein the binder is a styrene-butadiene copolymer.