DE2460300A1 - METHOD OF IMAGE RECORDING BY ELECTRICAL LINE AND IMAGE RECORDING MATERIAL FOR CARRYING OUT THE METHOD - Google Patents

Description

BLUMBACH -WESER ■ BERGEN & KRAMER

PATENT LAWYERS. IN AND WESBiDEN Wed ¹ MUNICH

DIPL-ING. P. G. BLUMBACH · DIPL-PHYS. DR. W. WESER DIPL-ING. DR. JUR. P. BERGEN DIPL-ING. R. KRAMER

62 WIESBADEN · SONNENBERGER STRASSE 43. TEL. (06121) 562943, 561998 MÖNCHEN

Canon K.K.

Tokyo, Japan Oasis 496

Method of image recording by electrical conduction as well Image recording material for carrying out the method

The invention "relates to a method of manufacture an image on a recording medium by means of electricity. In particular, the invention relates to a method of recording an image in which a thermosensitive Color developer is caused to develop by heat generated by electrical conduction.

The recording of electrical signals as an image has increased over the years with the development of image telegraphy and other telecommunications equipment increased. The conventional method which is suitable for such recording can be by electrical Discharge recording and electrolytic recording are represented.

509 8 2 7/0865

These methods are considered advantageous in that they simply create the image on your recording medium can that one brings about an electrical line by means of a cheap recording needle or a stylus, without the additional Auxiliary measures such as developing, fixing and the like are required. However, the recording method stick with it electrical discharge has the disadvantages that currently a strong, irritating odor and dust and smoke from the perforation of the surface layer of the recording medium spreads in the environment. aside from that the recording sheet itself takes on a grayish tint on and it is difficult to break down this touch as a recording material. Even with electrolytic recording, which is an IT measuring method is, the handling of the recording sheet is quite inconvenient and the resulting image quality is deteriorated by the electrolyte drainage, with the result that none satisfactory image quality can be achieved.

Furthermore, as yet another recording method, which is multilevel Operations such as developing and fixing are not required, a thermosensitive recording method has been introduced although this is not really the recording method using electrical conduction is. According to the above-mentioned method, the recording paper is advantageously inexpensive and has a handle very similar to ordinary paper, but the color developing speed is slow due to external heating and there is a problem in providing the heat source for recording. Furthermore is

- 3 -
509827/0865

the sharpness of the image is not high because of the heat diffusion.

In view of the above, "has not yet been a very effective imaging method which would be able to "produce an image more satisfactory when working by the dry process." Reproduce quality. ':

According to the invention, therefore, a new type of recording method with electrical conduction is primarily to be created, which has every advantage of the conventional electric conduction recording method and the heat sensitive recording method "and is capable of reproducing a quality To achieve an image that is superior to that obtained by these conventional methods. The recording method according to the invention with electrical conduction is also said to be able to generate an image at high speed and high sharpness by on the recording layer, heat is caused to be generated internally and in a short time.

Another object of the present invention is to provide an electric conduction recording method which is capable of very precisely address fine changes in the amount of electrical current and to produce a reproduced image of good quality which is superior in reproducibility to image tone .is. Furthermore, according to the invention, a recording method is to be used 'Electrical line to be created at the time of image recording is free from bad smell, dust and smoke.

509827/0865

Also, according to the invention, a method of opening with electrical Line can be created, which works on a dry basis and through. Moisture not affected at all will.

According to the invention, a method for image recording is provided by created electrical line, which is characterized in that the electrical line through a matrix body passes through, consisting of or containing an electrically conductive substance with an electrical conductivity, which is higher than that of a binder; and a heat sensitive one Color developing component consisting of a phenolic substance and a color developing lactone compound which is capable of developing color in contact with the phenolic substance; with all components are uniformly dispersed in the binder, thereby forming a color developed image by the heat applied caused by the electrical conduction.

According to another aspect of the invention, there is provided an image recording material for performing the above recording method.

FIG · 1 schematically shows an embodiment of the image recording according to the invention through electrical conduit; and

Pig. 2 is a graph showing the plot of voltage against current - invention in the (V i)

- 5 509827/0865

Shows matrix body.

The electrically conductive substance is a finely divided pesticide material which is insoluble in water at normal temperature or sparingly soluble, and the electrical conductivity of this conductive substance should necessarily be higher than the electrical conductivity of the binder.

The dispersion liquid, which the color developer, the electrically conductive substance as a fine powder as well as the binder is then applied to a substrate such as Paper, cloth, glass plate, plastic PiIm, metal plate, conductive paper with vapor-deposited metal, carbon-treated conductive paper, and other types of paper which were treated to achieve electrical conductivity. It is also possible for the matrix body as such to have a pilm shape processed and used as a recording medium.

The recording medium thus obtained becomes electrical conduction subjected by placing the recording stylus and a Back electrode in contact with the surface of the recording medium brings, whereby "-the phenolic substance melts and with the heat caused by the electrical conduction the color developing lactone to form an image on the Recording medium responds.

The invention is now with reference to the present Drawing described in more detail. The matrix according to the invention

509827/0865

body after Pig. 1 contains a phenolic substance 1, a color-developing lactone compound 2 and an electrically conductive substance 3, all of which are uniformly dispersed in the binder 4. This matrix body is used as a recording medium and is generally applied to a suitable substrate 5 in a thickness of 5 to 2 U- Kikrοη. In some pallen, however, the matrix body can be formed as such in a film *

The back electrode 7 is placed on the surface of the matrix body, which is connected to a power source 6. In this pail, if the substrate itself is also electrically conductive or is subjected to an electrical conductivity treatment was attached, the back electrode 7 on the side of this substrate be. A stylus 8 is also connected to the power source 6. When an electrical voltage is applied from this power source, an image is formed on the surface of the matrix by effect the heat, which in the vicinity of the recording pen, accompanying the electrical conduction is generated.

To make an image on the recording medium through the conduction of electricity To produce the generated heat effectively, the mixing ratio of electrically conductive substance and binder in the Matrix body very important. The suitable mixing ratio is from the type of electrically conductive material and the coating thickness of the matrix body on the substrate. As a result of investigations into the electrical properties of various matrix bodies by changing the types of electrical

- 7 -
509827/0865

conductive substance and the thickness of the matrix found that effective color development is achieved under the following specific conditions. The characteristic the voltage plotted against the current (V-i) of the matrix body is generally as shown in Pig. 2 is shown, where the resistance of the matrix. · is high at a voltage below a certain threshold, so that no current flows which causes the color developer to develop. However, at a voltage of a certain threshold value, the voltage-current characteristic changes (V - i) suddenly and a sufficient current flows to the heat-sensitive color developing component to stimulate. According to the invention, this threshold value should in a range from 30 to 250 volts, preferably from 30 to 150 volts. In other words, the mixing ratio should of electrically conductive substance and binder, as well as the coating thickness of the matrix can be determined so that the matrix body has the electrical properties mentioned above.

The electrical properties of the matrix body vary depending on according to the property of the electrically conductive substance used and binding agent as well as the coating thickness of the matrix body. There is a tendency for the above-mentioned threshold to be larger Value shows when the coating thickness increases and when the mixing ratio of the electrically conductive substance to the binder (hereinafter referred to as "P / V") decreases.

It has been found that the desired threshold, i.e. 30 to 250 volts, can be achieved if the P / V ratio is

- 8 509827/0 8 65 ^:

ranging from 4/1 to 1/30 liegx, εοίεΓη one an electrically, conductive High conductivity substance such as metal powder and metal powder vapor deposited on a support or the like; or when the P / V ratio is 20/1 to 1/5 if one an electrically conductive substance of low conductivity such as a metal compound, an alloy such as zinc-selenium, zinc-tellurium-selenium, Magnesium tellurium and the like, carbon compound, Uses clay, zeolite and the like; the coating thickness of the matrix body being in the range of 3 to 25 microns lies.

The following are those for the matrix body according to the invention substances to be used given by way of example.

1. Phenolic substance

The substance has such properties that it is solid at normal temperature, is insoluble or sparingly soluble in water and melts or evaporates ^{at a temperature of 50 ° C. and above.} Examples of such substances are the following:

4-tert-butylphenol
X -naphthol
Δ -naphthol

Methyl 4-hydroxybenzoate
4-hydroxyacetophenone
4-tert-octyl catechol
2x2'-dihydroxydiphenyl
4-hydroxyphenyloxide

- 9 -
50 9827/0 865

~ ⁹ "■. 2480300

2.2 ^l -I'Ieth.ylen-bis (^ - clxlürpO.enol) 2.2'-methylene- "bis (4-methyl-6-tert-butylphenol) 4,4'-isopropylidene-diphenol 4.4'-isopropylidene -bis (2-chlorophenol) 4.4'-isopropylidene-bis (2.6-dibromophenol) 4.4'-isopropylidene-bis (2 .. 6-dichlorophenol) 4.4'-isopropylidene-bis (2-methylphenol) 4.4'-isopropylidene-bis ( 2.6-dimethylphenol) 4.4'-Isopropylidene-bis (2-tert-butylphenol) 4.4'-se c. -Butylidene-bis (2-iaetnylphenol) 4.4'-cyclohexylidenediphenol 4.4'-Cyclohexylidene-bis (2-ine-ethylphenol ) 2.2'-thio-bis (4.6-dichlorophenol) 4.4 '- (1-methyl-n-hexylidene) diphenol phenolic resin

2. Color developing lactone compound

The compound is colorless or slightly colored "and contains one Lactone ring, which "under color development with the above-mentioned phenolic substance reacts. A leuco form of a triphenylmethane dye with lactone ring structure or a dye base of the fluorine type can be used. Examples of such Connections are the following:

3- (p-Dimethylaminophenyl) -3-phenylphthalide 3- (p-Diethylaminophenyl) -3-phenylphthalide 3- (p-U-ethyl-IT-benzylaminophenyl) -3-phenylphthalide 3- (p-Aminophenyl) -3-pb.enylphthalide

- 10 50 9827/0865

3.3-bis (p-dimethylaminophenyl) ~ 6-dimethylamononphthalide (Crystal violet lactone) 3.3-bis (p-dimethylaminophenyl) phthalide (MalacMtgrünlcaton) 3.3-bis (p-diethylaminophenyl) phthalide 3.3-bis (p-Diine thylaminophenyl) -5 ~ chlorophthalide 3.3-bis (p-dimethylaminophenyl) -5.6-dibromophthalide 3 x 3-bis (p-dimethylaminophenyl) -5-aminophthalide 3 · 3-bis (p-Dimethylaminophenyl) -5-Qe thy! Amino phthalide 3.3-bis (p-dimethylaminoplienyl) -5-dimetliylaminoph.tlialid 3 x 3-bis (3-methyl-4-dimethylaminophenyl) phthalide 3 x 3-bis (p-methylaminophenyl) phthalide 3.3-bis (p-IIethylaminophenyl) -5-acetylaminophthalide 3- (4'-Dimethylamino-6'-aminophenyl) -3- (4 "-dimethylaminophenyl) -5-acetyiaminophthalide 3_ (4 "-Dimethylaminophenyl) -3- (4" -hydroxyphenyl) phthalide 3- (p -diethylaminophenyl) -3- (acridin-2-yl) -6-dimethylaminophthalide

3- (p-Dimethylaminophenyl) -3- (9-ethyloarba2ol-3-yl) -6-dimethylaminophthalide

3.3-bis (9-ethylcarbazol-3-yl) phthalide 3 3-bis (9-ethyl-6-chlorocarbazol-3-yl) phthalide 3.3-bis (9-ethylcarbazol-3-yl) -6-dimethylaminophthalide 3- Dimethylamino-5.7-dimethylfluorane 3-diethylamino-5.7-dimethylfluorane 3-diethylamino-6.7-dimethylfluorane 3-diethylamino-5.β-dimethylfluorane 3. 6-bis (H-Me thy 1-lT-phe-nylamino) 4'.5'.6'.7'-tetrachloride luorane 3.6 ^ χ8 (ΙΤ-Αΐ1] ^ 1-ϊϊ-ρ1ιβ ^^ Εΐίηο) -4 ^ι .5 '.6'.7'-tetrachlorofluorane'3o6-bis L IT-Me thy 1-1Τ- (p- chi or phenyl) amino! 4'.7'-dichlorofluorane · ^J

- 11 509827/0865

- ¹¹ - 24603Q0

3.6-bis (IT-isoamyl - ^ - phenylamino) -5-2 odfluorane

3.6-bis [U-methyl-N- (p-clilorphenyl) amino j ■ 5'-bromo-B'-chlorine luorane ~.

3.6-l3is (left H-diethylamino) -4 '.5' .ö '^' - tetrachlorofluorane 3.6-bis (IT-Phenylainino) -4 '.5' .6 '.7'-tetrachlorofluorane 3.6-bis (E ".lT-diethylamino) fluorane (Rhodamine B Lac ton) 3 • 4-Benzo-6-dimethylaniinofluorane

2 · 7-diaminofluoran

3 x 3-Ms (p-diethylaminophenyl) naphthalide 3.3-Ms (p-dimethylamino phenyl) napthalide

3 · 3-bis (p-dimethylamino phenyl) -β (or 7) dimethylaminophthalide

3,3-bis (p-dimethylaminophenyl) -7-azaphthalide

3- (p-Dimethylaminophenyl) -3- (2-methylindol-3-yl) -6-dimethylaminophthalide

3- (p-dimethylaminophenyl) -3- (1-methylpyrrol-2-yl) -6-dimethylaminophthalide

3 «Electrically conductive substance

a) metallic powder: silver, gold, aluminum, nickel, cobalt,

Tin, bismuth, cadmium, indium, etc.

b) metal powder vapor deposited on a carrier such as aluminum oxide, Silicon dioxide etc

c) metal compound, for example

i) metal oxide: titanium oxide, zinc oxide, tin oxide, indium oxide, Tin-indium-oxide, molybdenum-oxide, tungsten-oxide etc.

ii) metal sulfide: zinc sulfide., calcium sulfide, copper sulfide,

Cd ^ GeSg, Cd ^ SiSg, Zn ^ GeSg, Zn ^ SiSg etc.

- 12 509827/0865

iii) metal phosphide: Aluminit..mpho.3phid, gallium phosphide,

Gallium aluminum phosphide, etc.

d) Alloy: zinc-selenium, zinc-tellurium-selenium, magnesium-tellurium, etc.

e) Carbon compound: silicon carbide, carbon fluoride, etc.

f) Clay: continorillonite, kaolinite, etc .;

g) Zeolite: Faujasite, Mordeni-t, etc.

The above-mentioned electrically conductive substances can alone or used in combination.

4. Binders

a) water-soluble synthetic high polymer: Polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl acrylamide, polyvinyl acrylic acid etc .;

b) water-soluble natural high polymer ©: cellulose, casein, gelatin, starch, etc.

c) polymer latex:

SBR, known as emulsion of styrene-butadiene copolymer, etc.

The following examples are given for illustrative purposes however, do not say anything about the scope of the invention.

example 1

5 g of crystal violet lactone, 1 g of rutile type titanium oxide, 3 g Polyvinyl alcohol (degree of polymerisation 1000 and degree of saponification $ 85) and 12 g of water are mixed and placed in a ball mill for 2 days and nights to prepare a dispersed liquid A kneaded.

- 13 509827/0865.

Then 5 g of bis-phenol A, -1 g of rutile-type titanium oxide, 5 g Polyvinyl alcohol (degree of polymerization 1000 and degree of saponification $ 85) and 12g of water and mixed in a ball mill for two days and tray to prepare a dispersed liquid B is kneaded.

Thereafter, "both of the dispersed liquids A and B become uniform dispersed together with 1 g of syrber powder and the resulting dispersed liquid is applied to a paper, which is evaporated aluminum in a film thickness of 10 microns having after drying.

A back electrode is placed on the recording sheet thus produced from an aluminum plate and a direct current is applied to the back electrode and a recording pen made of tungsten on with positive (+ ") polarity of the stylus.

The threshold value of the above-mentioned recording sheet is about 70 volts. Scanning with a recording stylus at a recording voltage of 100 volts leads to the generation of a blue image on the recording sheet.

Examples 2 to 10

The procedure of Example 1 is repeated with the exception that instead of the electrically conductive substance of Example 1, the electrically conductive substances of the following Table I used and a recording paper with effect

509827/0865

Recorded a "blue image. The threshold values of the Recording paper and the image recording conditions are shown in the following Table I:

■ Table I

Example electric. Additional low threshold value recording polarity conductive (g) (V) voltage voltage substance (V) burin

2 ZnS 5.0 120 150 U) 3 SnO ₂ 4.0 105 130 U) 4th ' ^In 2 ° 3 5.0 110 130 U) 5 AIP 3/0 120 150 U) 6 -. CaS 5 / O 180 200 (+) 7th MgTe l _; 0 75 110 AC *) 8th SiC 4.0 130 160 AC 9 ZnO 5.0 150 180 U) 10 Μο0 _Λ 5 »0 170 180 (-)

Note: *) AG means Viechseistrom

Example 11

5 g crystal violet lactone, 25 g faujasite and 70 g water mixed and kneaded in a ball mill for a full two days and nights to obtain a dispersed liquid A. 10 g Bis-phenol A, 20 g faujasite and 70 g water are in a ball mill mixed and kneaded for a full two days and eighth to obtain a dispersed liquid B.

- 15 -

50 9 827/0865

A polyvinyl alcohol (degree of polymerization 1000, degree of saponification 85 $) is then added to 100 g of each of the dispersed liquids A and B in various amounts shown in Table II below. Following the procedure of Example 1 _; the resulting polyvinyl alcohol mixtures are applied to a paper bearing vapor-deposited aluminum to produce a recording sheet. Then, the recording sheet is subjected to the electric conduction for image formation. The threshold values of the recording sheet and the quality of the image produced are shown in Table II below:

Table II

Amount of pulls threshold image quality comments set polyvinyl (V) alcohol (g)

damaged
by elek
tric ent
charge bad Image density = 1,
Recording
voltage = 75
Recording
current = 20 coating
damaged 05
V
mA Il bad coating
damaged 150 Well 100 Well 50 Well - - - ·

- 16 -

503827/0865

Comments: 1. Graver pressure on recording sheet..10 g.

2. Recording speed. 50 cm / sec.

3. Polarity of the stylus ..... negative (-)

Examples 12 Ms 22

33 g dried molecular sieve SK-40 (synthetic zeolite der Union Carbide Corp., USA), 22 g zinc oxide, 10 g each of the following listed lactone compounds, 9 g of polyvinyl alcohol and 135 g of water are placed in a ball mill and 72 hours mixed and kneaded.

Separately from the above mixture, 36 g of dehydrated molecular sieve are placed SK-40 (synthetic zeolite from Union Carbide Corp., USA), 24 g zinc oxide, 20 g each of the following phenolic substances, 11 g polyvinyl alcohol and 120 g water in a ball mill and mix and knead for 72 hours.

The corresponding dispersed liquids are then mixed well in the same amount by stirring and then the resulting mixed liquid on aluminum layer paper in such a way that the coating thickness becomes 12 microns after drying.

A back electrode is attached to the recording sheet thus produced on and the recording sheet is scanned by means of a recording stylus made of tungsten at a speed of 0.5 m / sec. applying a DC voltage of negative (-) polarity.The results are shown in Table III below: - 17 -

50 9 827/0 865

Tatelle III

at lactonver- phenolic Swell-openζ security quali- game ties Substances value (V) ability activity an- image put Chip tion (V)

3-dimethylamino-5.7-dimethyl-- fluoran

3.4-benzo-6-dimethylamino- fluoran

4-tert-butylphenol

70

Methyl-4-hydroxy-75
benzoate

3.3-bis (p-dimethyl 2,2'-dihydroxyaminophenyl) diphenyl phthalide

70

3.3-bis (p-dimethyl mixture (1: 1) of 80 aminophenol) - bis-phenol-A and naphthalide a polycondensate

sation product of Phenol and formaldehyde

3- (p-N. II-dimethylamino phe ny1) -3-phenylphthalide

4.4'-Isopropylidenebis (2.6-dimethyl-75
phenol)

3.3-bis (p-dimethyl-4.4'-see-aminophenyl) -7-butylidenazaphthalide bis (2-methyl-

phenol)

75

150

150

150

150
150

very good

Well

very good

. Well

very good

very good

3- (p-Di3iethyl-
aminophenyl) -
3- (1-methyl
pyrrol-2-yl) -
6-dimethyl-
aminophthalide 4.4'-cyclo
hexylidene
diphenol 75 150 very
Well Malachite green
Lactone 2.2'-methylene
to (4-chlorine-
phenol) 70 150 very
Well 3.3-bis (p-methyl-
aminophenyl) -5-
acetylamino
phthalide 2.2 «-Thio-bis
(4.6-dichloro-
phenol 75 150 Well

- 18 -

5098 27/0865

Table III (continued)

Recording

Phenolic swellability in the case of lactone compounds game substances worth (V)

applied voltage

picture quality

21 3.3-bis (9-ethyl-4.4 '- (1-methyl-75 150 very carbazol-3-yl) - n-hexylidene) - good 6-dimethylaminodiphenol

phthalide

22 3- (p-dimethylamino-polycondensation phenyl) -3-acridine product of 85 '200 good 2-yl) -6-dimethylamino-phenol-

phthalide formaldehyde

Example 23

The coating liquid of the composition shown in Example 12 above applies nan on aluminum layer paper with different thickness after drying. The recording sheets thus obtained one checks their electrical properties (threshold value). The results are shown in Table IY below:

Table IV Film Thickness (Microns) Threshold (V)

1 coating damaged by sparks

3. 40

5. 50

7 55

10 60

12 70

15th 110

- 19 -

5QS827 / 086 5

Table IV (continued) Film Thickness (Microns) Threshold (V)

20-160

25 235

30 t damaged by electrical discharge

manure

Example 24

Recording sheets having the recording layer of the following composition are prepared. Type and amount of electrical conductive substance and the amount of binder in the bulk of the recording layer are as shown in Table V below shown varies in view of the test, as the threshold value of the recording sheet varies by variations in the components changes.

Composition of the recording layer

Electrically conductive substance Λ

? 14 parts by weight of binder (cationic starch) J

Crystal violet lactone 1 part by weight

bis-phenol A '2 parts by weight

The recording sheet is produced by preparing a coating composition for the recording layer according to Example 1 or Example 11, and applying this mass to a paper with vapor-deposited aluminum in a thickness of 10 microns (according to the Dry). The results are shown in Table V below:

- 20 -

509827/0865

2A60300

Table V

Amount used Amount used Ratio used electrical conductive conductive binder capable material material /, (parts by weight) (parts by weight) binder Sohwellwert (y)
'Electrically conductive material

SnO,

synthetic zeolite
Molecular sieve
13X

Mg-Te

13.55

0Λ5

30/1

13; 46 0.54 25/1 13.33 O ₇ 67 20/1 13.12 0.88 15/1 12.73 1.27 10/1 12 _; 44 1.56 8/1 12 ₇ OO 2.00 6/1 11; 67 2 ₇ 33 5/1 ll _; 2O 2.80 Vi IO j 50 3.50 3/1 9.33 4.67 2/1 7 _f oo 7 - 00 1/1 4.67 9 _T 33 1/2 3 _r 5O 10.50 1/3 2.80 11.20 IA 2.33 11.67 1/5 2.00 12 ^ 00 1/6 1 _T 56 12.44 1/8 1.27 12.73 1/10 0.67 13 _T 33 l / 20bes
ele O ₇ 45 13.55 I / 30

Cover damaged by
Spark

200

-dto- -dto- -dto- -dto- -dto- -dto-20 30 30 30 35 40 50 65

electr . Bntl adung

damaged by 110 electr. discharge

dto- -dto ko 65 ko 65 ko 65 ko 65 ko 65 M. 70 50 90 55 110 70 150 90 180 115 200 i4o 230 160 250 175 ^{t €} i harm

225

electrical discharge

-dto-

-dto-
-dto-
-dto-

-dto-

150 190 210

240

- 21 -

509827/08

According to the invention it is possible to produce a very large image pattern Achieve sharpness and record images at high speed to achieve in a way that the conventional thermosensitive recording method could not achieve. Such unique features of the subject invention can be realized by the fact that, unlike the Method of applying heat from outside, as in the conventional one thermosensitive recording method is the case, the method according to the invention makes it possible to generate heat from itself can be generated by yourself and in a very short time. In addition, there is no blurring of the image, essentially because of the very low heat diffusion.

Further, since it is possible to finely adjust the amount of electric current at the time of electric conduction, it becomes very fine fine adjustment of color density in accordance with a given amount of electric current is feasible by an image excellent tint.

According to the present invention, there is no electrical leakage with time of image recording on the surface of the recording sheet. Discharge along with electric discharge recording, and therefore, undesirable odor, dust and smoke emission from the perforation of the recording sheet does not occur.

In addition, there is no moisture dependency, as is the case with electrical recording is present, and therefore the handling of the recording medium is very, easy and convenient.

-Patent claims-50 9827/0865 '

Claims (8)

BLUMBACH · WESER - ÖER3EN & KRAMER PATENTANWÄLTE IN WIESBADEN AND MUNICH DIPL-ING. f. G. BLUMBACH · DIPL-PHYS. DR. W. WESER DIPL-ING. DR. JUR. P. BERGEN DIPL-ING. R. KRAMER WIESBADEN ■ SONNENBERGER STRASSE 43 ■ TEL. (06121) 562943, 561998 MÖNCHEN patent claims 1. Method of image recording by electrical conduction, thereby characterized in that electrical conduction is passed through a matrix body, consisting of or containing an electrically conductive substance having an electrical conductivity greater than that of a Binder; and a heat-sensitive color-developing component composed of a phenolic substance and a color-developing lactone compound composed which capable is to develop color in contact with the phenolic substance} with all components in the binder uniform are dispersed, thereby creating a color developed image by the heat transmitted by the electrical conduction caused. 2. The method according to claim 1, characterized in that a matrix body is used which has such an electrical Has the property that the resistance of the matrix body at a certain threshold value in the range of 30 to 250 volts of the applied voltage changes suddenly, causing the electrical conduction with a voltage which is not less than the threshold. 3 · Method according to claim 1 and · 2, characterized in that one uses a matrix body whose threshold value is 5Ü9827 / 0865 range from 30 to 150 volts 4. The method according to claim 1 and 2, characterized in that a matrix body is used in which the electrically conductive substance has high conductivity, the ratio the electrically conductive substance to the binder in the Range from 4: 1 to 1:30, and the film thickness of the matrix body ranges from 3 to 25 microns. 5. The method according to claim 1 and 2, characterized in that a matrix body is used in which the electrically conductive substance has low conductivity, the ratio of the electrically conductive substance to the binder is in the range of 20: 1 to 1: 5, and the film thickness of the matrix body ranges from 3 to 25 kikron. 6. The method according to claim 4, characterized in that a matrix body is used in which the electrically conductive Substance is metal powder or metal powder vapor-deposited on a carrier. 7. The method according to claim 5 »characterized in that one a matrix body used in which the electrically conductive Substance metal compound, alloy, carbon compound • is bond, clay or zeolite. 8. Image recording material for carrying out the method according to claim 1 to 7, characterized in that it consists of a 5ü9827 / ü8 6 nem Katrixkörper "consists or has a matrix body, consisting of or containing an electrically conductive substance with an electrical conductivity which is higher is as that of a binder; and a heat sensitive one Color developing component consisting of a phenolic Substance and a color-developing lactone compound which is able to develop color when in contact with the phenolic substance comes; whereby all components in the binder are uniform borrowed are dispersed and wherein the matrix body such has electrical property that the resistance of the matrix body at a certain threshold value in the range of 30 to 250 volts of the applied voltage suddenly changes. 9 · Material according to claim 8, characterized in that the electrically conductive substance has a high conductivity, the ratio of the electrically conductive substance to the binder is in the range from 4: 1 to 1:30, and the Film thickness of the matrix body ranges from 3 to 25 microns. 10 · Material according to claim 8, characterized in that the electrically conductive substance has low conductivity that the ratio of the conductive substance to the binder is in the range from 20: 1 to 1: 5, and the pilm thickness of the matrix body ranges from 3 to 25 microns. 509827 / 086S