JPS613145A - Electrostatic recording body - Google Patents

Abstract

PURPOSE:To obtain an electrostatic recording body prevented from bleeding in low-speed copying, and adverse side effect, such as lowering of image density in ordinary speed, by using a copolymer composed essentially of a specified resin as a principal component of an insulating resin for forming a recording layer formed on a conductive substrate. CONSTITUTION:The copolymer is compsed essentially of at least one selected from each of two groups of A; methyl methacrylate, ethyl ethacrylate, and t-butyl methacrylate, and B; glycidyl methacrylate and glycidyl acrylate, and it is used as a principal component of the insulating resin of the recording layer formed on the conductive substrate. The polymn. ratio of B/(A+B) is controlled to >=2%, and the glass transition point of the copolymer is set to 40-100 deg.C. This electrostatic recording body is obtained, e.g., by forming a conductive layer 2, such as polymer of ammonium styrenesulfonate or tin oxide, and the recording layer 3 contg. the resin 4 and a pigment 5 on the surface of a base 1, such as plain paper or polyester film. As a result, this electrostatic recording body is prevented from bleeding even at the time of low-speed development, and high image density can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The technical field (D)
This relates to a wet development type electrostatic recording material for electrostatic printers used in dedDesign>, especially an electrostatic recording material used in a development method in which a developer is ejected from a slit. It is also used as an electrostatic recording material for combs.

BACKGROUND ART In recent years, CAD has become popular, and electrostatic recording type printer plotters are attracting attention, especially in terms of speed and resolution.

Electrostatic printer plotters usually have 20 to 40+na+/
Printing and development are performed at a speed of about seconds, but in the case of images with special image information dense, the speed decreases dramatically depending on the calculation speed of the combi coater, and the speed is reduced to 0.5 to 2 Illil/ Sometimes it takes just a second.

As described above, because the development speed fluctuates greatly, with conventional electrostatic recording media, there is no problem at normal speed, but when the speed is slow, the image may smear and the characters may become unreadable. , there was a problem that the quality of the copied image deteriorated significantly. This phenomenon is particularly noticeable in the case of a developing method in which liquid is ejected from a slit.

Purpose: As a result of research on blurring of copied images, the present invention provides an electrostatic recording medium that does not blur even when the copying speed is slow and does not cause side effects such as reduced image density even when copying speeds are normal. This is what makes it [i-specific].

Structure The structure of the present invention is that in an electrostatic recording material in which a recording layer mainly composed of an insulating resin is provided on a conductive support, the resin component of the recording layer is methyl methacrylate, ethyl methacrylate, or t-butyl. This is an electrostatic recording material whose main component is a copolymer containing as essential components one or more types of methacrylates, glycidyl methacrylate, and one or more types of glycidyl acrylates.

The electrostatic recording medium of the present invention is particularly suitable for use in electrostatic printer plotters, particularly in a wet development system in which a developer is ejected from a slit. There are concrete versions up to v4 shown in the drawings 1 and 1 to 4.

FIG. 1 shows a conductive layer 2, a resin 4 and a pigment 5 on the surface of a substrate 1.
A recording layer 3 containing a conductive substrate 6 is provided in FIG.
3 has a recording layer 3 on the surface of the substrate 1, and FIG.
In the figure, a conductive layer 2 is provided on both sides of a conductive substrate 6, and a recording layer 3 is provided on the surface.

The S-conductive support of the electrostatic recording material of the present invention is composed of a base and a conductive layer, or the base itself is conductive. The base body and the conductive layer are made of conventionally known materials and there is no problem. For example, the substrate may be Tsurutsu paper, transparent paper, polyester film, synthetic paper, or the like.

For the conductive layer, a polymer electrolyte (polyvinylbenzyl 1 to rimedyl ammonium chloride, ammonium polystyrene sulfonate, etc.), conductive zinc oxide, tin oxide, etc. can be used.

As already explained, the resin of the recording layer of the recording medium of the present invention is as follows:
-, t-butyl methacrylate B, glycidyl methacrylate, and glycidyl acrylate, and the main component is a copolymer selected from each group with one or more selected from each group as an essential component. The polymerization ratio is such that component B is 2% or more, preferably 4% or more of the copolymer, and the glass transition point is 40 to 1.
00°C, preferably in the range of 50 to 90°C.

If the B component is too low, bleeding will occur, if the glass transition point is low, blocking (a phenomenon in which copy paper or roll paper sticks together) will occur, and if the glass transition point is too high, curling will become strong. The reason why component B is effective in preventing bleeding has not yet been fully elucidated.

As for the V-rice in the recording layer, any conventionally known type B can be used, but calcium carbonate is suitable.

Hereinafter, the present invention will be specifically explained with reference to Examples. In addition, the amounts (%, parts) of each component in the examples are based on weight.

Example 1 Methyl methacrylate 85% Glycidyl methacrylate 13% Acrylic 1i2% Copolymer consisting of the above components (30% toluene solution)
A recording layer liquid was prepared by mixing 100 parts of White Seal 310 (manufactured by Takehara Chemical Co., Ltd., fatty acid treated calcium carbonate) and dispersing the mixture in a )7 triter for 10 minutes.

On the other hand, RK for Tsubo II60gr/@2 upper M lit
Impregnated with 100 parts of M5500 (manufactured by Sanyo Chemical, 33% aqueous solution of polymer electrolyte) and 100 parts of methanol,
Dry for 1 minute at 100°C and dry phase m fl +Ogr/
m2) A conductive substrate was made.

A recording layer liquid is applied to one side of this conductive substrate, and a drying material lff16
It was coated with a wire bar to a thickness of mm2 and dried at 100° C. for 1 minute to obtain an electrostatic recording material.

Example 2 Edel methacrylate 85% glycidyl acrylate 13% methacrylic acid
An electrostatic recording material was prepared in exactly the same manner as in Example 1, except that a 2% copolymer solution (30% toluene solution) was used.

Example 3 t-Butyl methacrylate 75% glycidyl methacrylate 8% t-butyl methacrylate
15% acrylic acid 2
An electrostatic recording material was prepared in exactly the same manner as in Example 1, except that % copolymer (30% toluene solution) was used.

Comparative Example 1 An electrostatic recording material was produced in exactly the same manner as in Example 1, except that methyl methacrylate was used instead of glycidyl methacrylate.

Comparative Example 2 An electrostatic recording material was produced in exactly the same manner as in Example 2, except that methyl methacrylate was used instead of glycidyl acrylate.

Comparative Example 3 An electrostatic recording material was produced in exactly the same manner except that styrene was used instead of t-butyl methacrylate.

The above six types of electrostatic recording media VER3ATEC822AFIWtt71J interface.

Images were drawn using a vine at developing speeds of both 1.5 mm/sec and 25 mm/sec.

The results are as follows.

Note: ◎: No stains or bleeding occurred at all.

O: Some scumming and bleeding are seen, but it is about 6 seconds old and does not cause any problems in use.

△: Significant scumming and bleeding, unsuitable for use.

X: Unusable due to excessive background stains and bleeding.

As is clear from the explanation of the effects, the electrostatic recording material of the present invention exhibits remarkable effects in that bleeding does not occur even during low-speed development and the image density is high.

[Brief explanation of the drawing]

1 to 4 are partially enlarged cross-sectional views showing the structure of each specific example of the electrostatic recording medium of the present invention. DESCRIPTION OF SYMBOLS 1... Substrate, 2... Conductive layer, 3... Recording layer, 4...
... Resin, 5... Pigment, 6... Conductive iR-active substrate.

Claims (1)

[Scope of Claims] An electrostatic recording material in which a recording layer containing an insulating resin as a main component is provided on a conductive support, wherein the resin component of the recording layer is one or more of the following group A and group B. An electrostatic recording material whose main component is a copolymer containing one or more of the following as an essential component. Group A Methyl methacrylate Ethyl methacrylate t-Butyl methacrylate Group B Crisidyl methacrylate Glycidyl acrylate