SU957159A1 - Material for electrostatic data recording - Google Patents

Description

(54) ELECTROSTATIC MATERIAL. RECORDING INFORMATION

one

The invention relates to the technology of making electrographic types of paper used in apparatus for recording and reproducing information by an electrostatic method.

An electrostatic material is known that consists of an electrically conductive paper substrate and an electrophotographic layer representing a polystyrene film applied from solution 1.

The disadvantage of such a material is that the electrographic layer is partially pressed into the substrate, as a result of which the material is not sufficiently contrasting and uniform.

Also known is an electrostatic material for recording information, consisting of an electrically conductive substrate and an electrophotographic layer containing a pigment and a binder — a popiviin cable 2.

However, this material has insufficient image contrast due to the low charging potential.

(22O V with a layer mass of 25 g / m), since the electrographic layer of such a material has microdefects, which significantly reduce the potential for charging. The closest to the invention in its technical essence and the achieved positive effect is the material for the elec- trostatic content of information, consisting of an electrically conductive, paper substrate and an electrographic 10 layer containing pygmigg and bonding tSl. .

Electrographic layer of this material as a binder srdsnit

15 a mixture of a water-soluble carbamide resin (melamine-formaldehyde resin) and an alkyd resin — polycondensate glycols with unsaturated fatty acids and ortho-phyric acid at a ratio of 20 resins, respectively, from 1: 9 to 6: 4i. Layer components are in the following amounts, parts by weight : pigment 100 binding 10-60. As a pigment, the electrographic layer contains zinc oxide.

However, such a material does not allow to obtain a high-contrast image due to the fact that its charging potential does not exceed 250 V. This is due to the fact that to convert a water-insoluble alkyd resin to a water-soluble BopiiMoe state in order to form a mixture with a water-soluble urea resin in the composition of the electrographic layer salts of volatile bases are added. The introduction of these salts smells the specific concentration of the electrographic layer and, accordingly, the charging potential. At the same time, when using only water-soluble urea resin as a binder, the charging potential does not exceed 50 V.

The aim of the invention is to increase the image contrast by increasing the charging potential.

The goal is achieved by the fact that in an electrostatic recording material consisting of an electrically conductive paper substrate and an electrophotographic layer containing a pigment and a binder, the electrophotographic layer contains a blend of fluoropoly carbamide resin with polyvinyl butyral at a ratio of 1: 3 to 1: 6 and with the following content of components in the layer, wt.: Pigment 100, binding 10 200.

As a pigment, the electrographic layer may contain titanium dioxide and zinc oxide, silicon dioxide, kaolin, talc or their mixtures.

In the proposed material, the effect of increasing the contrast is achieved by increasing the charging potential of the electrographic layer. The latter, in turn, is due to the fact that when used as a binder mixture, an alcohol-soluble urea resin and polyvinyl butyral with their ratio indicated and the content of the component of the electrographic layer used in the composition of the layer of synthetic resins show previously no unequal properties, with themselves and with the surface of the pigment, the interaction resulting from their chemical nature. As a result, a homogeneous electrophotographic layer is formed, in which there are no microdefects characteristic of the layers using

binder of one polyvinyl butyral and groupings lowering specific motivation. As a carbamide resin, the electrographic layer may contain melamine or urea-formaldehyde resins, soluble in aliphatic alcohols, such as methanol, ethanol, propanol, butanop, isobutanol, and also in aromatic hydrocarbon, such as xylene and toluene.

In order to increase the uniformity of the image, the electrographic layer may additionally contain an inert filler, which is a part 5 of the CB1 dielectric material. 5-20 microns in an amount of 0.1-10 wt.h, per 100 wt.h. pigment.

The following materials can be used as an inert filler: silicate particles, glass for dust, starch, polyethylene powder, or mixtures thereof. When an additional inert filler is introduced into the electrophotographic layer, which consists of parts of a dielectric material with a size of 5–20 µm, in an amount of 0.1–10 wt.h. per 100 wt.h. pigment, increased image uniformity. This is because in the process of recording information in systems with a recording electrode, due to the presence in the electrographic layer of coarse particles protruding 2–10 µm above the surface of the layer, the distance between the surfaces of the recording electrode and the material is stabilized in the optimum interval for recording information .

The proposed material for electrostatic recording of information is obtained as follows.

An electrically conductive substrate, for example, ETB-3 base paper, aluminum foil laminated paper, paper coated with a layer of organic polyelectrolyte or impregnated with inorganic layers, is applied to the watering installation with a suspension of pigment in the binder solution and dried until organic solvents are removed. Coating weight 25 g / m

The image on the resulting material is formed by charging the relevant areas of the material and the subsequent manifestation of toner particles capable of. attract charged areas. 5Example In a ball mill

within 10 hours the suspension is dispersed, containing 7.5 wt.h. methyl-amino-aldehyde resin K-421-O2;

2.5 iac.4. polyvinyl butyral brand 1OO May. h. barium sulphate and 150 may-, h ethyl alcohol. In a laboratory watering installation with a roller roll, the suspension is applied to the base paper.

ETB-3 layer weighing 25 g / m and dried in an oven at 800 ° C.

PRI mme R 2. The material for electrostatic recording is made according to the Technology similar to Example 1. The suspension contains the following components, parts by weight: K-411-02 urea-formaldehyde resin (5p% resin solution in butanol) 28.57; polyvinyl butyral grade PSh 171.43; zinc oxide 10O; glass dust of a fraction of 10–15 µm 1 O and ethyl alcohol 400. Paper covered with aluminum foil is used as a substrate. The mass of a layer is 25 g / m.

Example 3: The material is manufactured according to the technology similar to Example 1, wherein the suspension contains the following components, parts by weight: a K-411-O2 carbamide resin. 50, polyvinyl butyral grade PSh 50, titanium dioxide 60, silicon dioxide A-ZOO 2O; talc 20, corn starch with a grain size of 520 microns 5, ethyl alcohol 2OO and toluene 100. As a substrate. use paper soaked in lithium chloride and glycerin.

EXAMPLE 4 The material was manufactured according to the technology similar to Example 1, wherein the suspension contains the following components, parts by weight: resin grade K-421 O2 13, O4, polyvinyl butyral grade LA 6.54, titanium dioxide 100, silicone particles - waste production of aluminum fluoride 4,26, ethyl alcohol 6O and toluene 45. As a substrate, use paper coated with a layer of organic polyelectrolyte type K-9.

PRI me R 5. The material is made according to the technology similar to the example.

750 420 750 790 500

1, while the suspension contains the following components, parts by weight: resin K-411-02 2O, polyvinylbutyl alcohol mg LA 4, titanium dioxide 50, barium sulphate 25, kaolin 25, glass dust of fraction 1O-15 µm 0, 1 and ethyl alcohol 25O. As a substrate, paper laminated with aluminum foil is used.

Examples 6 and 7 show experiments on the manufacture of material for electrostatic recording according to a known method.

EXAMPLE 6 The material is manufactured according to the technology similar to Example 1, wherein the suspension contains, in parts by weight: a water soluble melamshumyl formaldehyde resin of the grade KF-MT 5, an alkyd resin of polyvalent condensate of talic acid neopentyl glycol and pentaerythritol 20, oxide zinc 10 O, water and aluminum oleic acid 250 to a pH of suspension of 8.6. The suspension is applied to paper that has been lashed with aluminum foil.

PRI me R 7. The material was manufactured using the same procedure as in example 1, the suspension contains, in parts by weight, water soluble melamine formaldehyde resin of the KFZh 2O brand, alkyd polycondensate o-phthalic acid resin, neopentyl glycol, and trty methypropane 2O, zinc oxide 10O, water and aluminum oleic acid 250 to pH 9.0. The slurry is applied to paper lined with aluminum foil.

For example, (control). The material is made according to the technology similar to example 1, while the suspension of sodernsite, wt.h .: polyvinyl butyral brand LA 18; zinc oxide 100 and ethyl alcohol 200. Suspension applied to paper soaked in potassium chloride and glycerin.

The test results are shown in the table.

450 300 440 470 360

(famous)

320

350

Claims (3)

ZOO From the table it can be seen that the deposited material has a 2O-80% higher charging potential than the known one, 1.5–2 times higher than the control sample. In addition, the raw material is easier to manufacture than the known material, since the application of the electrophotographic layer is carried out with organic solvents, which results in faster drying of the material and, accordingly, an increase in the productivity of the equipment. Claims of the Invention An Enforcement Electrostatic Recording Material consisting of an electrically conductive paper substrate and an electrographic layer containing a pigment. 957159 8 Continuation of the table 230 250 220 And a binder, characterized in that, with intact® and image contrast by increasing the charging potential, the electrographic layer as a binder contains a mixture of water soluble urea resin with ivinyl butyral in a ratio from 3: 1 to 1: 6 and with the next content of components in the layer, parts by weight: pigment 100 and binder 1020O. Sources of information taken into account in the examination 1. USSR author's certificate number 193300, cl. G03Q 5/04, 1965. 2.Paper eectrophotographic ESP. TU 81-01-326-74. 3. US patent 3607260, cl. 96-1.8, pub. 1971 (prototype).