CS231168B2 - Recording material - Google Patents

Abstract

A pressure-sensitive record material comprising the colorless chromogenic dye Pyridyl Blue mixed with and adsorbed onto a pigment which is coated on a substrate sheet, and capsules containing an acidic resin dissolved in a suitable solvent, the capsules being coated on the same or an additional sheet. This "reverse" system (where the acidic resin rather than the dye is encapsulated) provides an improved community of properties, including improved image strength, print stability (fade resistance) and resistance to degradation. Pyridyl Blue is a mixture of the isomers 7-(1-ethyl-2-methylindol-3-yl)-7-(4-diethylamino-2-ethoxyphenyl)-5,7-d ihydrofuro[3,4-b]pyridin-5-one and 5-(1-ethyl-2-methylindol-3-yl)-5-(4-diethylamino-2-ethoxyphenyl)-5,7-d ihydrofuro[3,4-b]pyridin-7-one.

Description

(54) Recording material

Recording material consisting of a substrate coated on one side with a water-insoluble, chemically neutral pigment on which a chromogenic component consisting of 5- (1-ethyl-2-methylindol-3-yl) -5- (4-detellemioo-1-) is adsorbed etoxyeaorl) -5,7dihydroeuror3.4-b! - ^ ^ Dyri dlin7'7oneem and / or (1 _(e iy lt LM eietyn indll ^ -ID -7- (4-eiety 1aminoo22eetoyfenyl) -5,7-dihydrofuro [ 3,4-b-pyridin-4-ol.

Vymilez relates to the recording material and the method of its production.

The color systems used in pressure sensed mattrials typically consist of a substantially colorless chrorogamous material, a developer that reacts with the chromogenic material to produce a color, and a solvent in which said color reaction takes place. The reactants of this system are stored separately. This is usually accomplished by encapsulating the solution of the epithelium in the microcapsule. At the time of application of the pressure, the pressure sensitive mitarokaple ruptures and the cogenic epithelium solution contained in the microcapsules is mixed with the developer, whereupon the chromogenic component and developer react to form a dye to which b / eno is exerted by pressure.

In this way, it is possible, for example, to obtain a copy of the recording material in the form of a copy sheet, i.e. a sheet supported under the original sheet, without the use of carbon paper.

Said recording material consists, for example, of a sheet of denier, on the surface of which a layer of smmsi microcapsules is deposited, containing separately a solution of the chromogenic component and the developer. The microkaeole containing the solution and the developer can also be dispersed directly in the sheet of the recording material.

You can also use at least two recording memos for making copies. One such material is, for example, a leaf sheet which is coated with a layer of miccokaeoli containing a solution of the chemi-chemical component (hereinafter referred to as a donor leaf, i.e. a sheet coated on the back), and the recording material is formed, for example, by a press. a paper having a developer coating (this sheet will hereinafter be referred to as the acceptor sheet, i.e., the front screed sheet). The two sheets are placed on top of each other so that their coatings touch each other and, under pressure, for example by a typewriter, can be transferred to transfer a solution of the component from the dressing sheet to the acceptor sheet.

When making more than one copy, a further recording meame may be included in the mm 2 donor and acceptor sheet, which consists, for example, of a paper sheet provided on one side with a layer of microcapsules containing a chromogenic component solution and on the other with a developer coating. One or more of these tissue sheets (i.e., sheets overmoulded on both sides) are deposited between the donor and acceptor sheets such that the side of the sheet that contains the chromium-containing microcalar layer always touches and therefore adheres to the other side of the sheet than the developer coating. In this way, an original record is obtained on the thatched sheet and copies are made on the acceptor sheets e on the acceptor sheet.

The microsphere - i.e., it is a non-microbial solution ₉ encapsulated in a microcapsule, a chromogenic component, or a combination of chromogenic components, since these components are usually more easily subject to degradation - when exposed to atmospheric conditions than the developer.

Recently, however, British Patent 1 337 924 has described a recording maatral in the form of a sheet which undergoes a color reaction of a chromogenic component and a developer, which sheet is provided with a layer of a water-insoluble, chemically substantially neutral pigment over which it is adsorbed at least one substantially colorless chromium component which is capable of forming a dye by reaction with the developer. By adsorption to the pigment, the chromium component is largely stabilized for decomposition upon exposure to atmospheric conditions, thereby allowing the use of recording materials in which the developer encapsulated solution is present, rather than the aganeous component.

Although various chromogenic components are listed, it is in fact the only protective component actually used in the recording mineral according to said British patent

337,924 L-octetone violet which is 3,3-bi8- (β-time γ-aminophenyl) -6-dimethylethylnaphthalide.

The use of this chromogenic component is very advantageous, although such recording material has a number of properties that need to be further improved. These include, for example, insufficient intensity of the resulting coloring of the copy, low resistance of the recording material for 1 darkening, and low ability of the adsorbed chromogem component to withstand the effects of atmospheric conditions.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a recording material of a similar composition which is free from the above disadvantages.

The above-mentioned drawbacks have no recording material according to the invention, which consists in that it consists of a substrate on one side of which a layer of a water-insoluble, chemically neutral pigment is deposited, on which a chromogemic component consisting of 5- (1-rtyl-2) is adsorbed. -mrtylinSol-3-y1) -5- (4-Sirtyltmino-2-etoχyfrnгl) -5,7-Sihydrofuro [3,4-b] pyridine-7a _of it and / or 7- (1-rtyl-2-metylinSol -3-yl) -7- (4-diethylamino-2-nitro) -5,7-di [eta] < 4 >

The recording material according to the invention preferably comprises at least one further chromogenic component adsorbed onto the pigment.

The recording material according to the invention preferably contains calcium carbonate as a pigment.

The recording material according to the invention may be coated with a pressure solution containing a developer solution on the other side of the substrate.

The pigment side of the recording material according to the invention may also comprise a pressure-sensitive microcapsule coating containing the developer solution or the developer solution may be incorporated into the support.

As a developer, the recording device according to the invention preferably comprises an acidic novolak resin.

Preferably, the resin may be a β-phenylo-diallyl resin or a β-octylphenol-molylde-resin.

The recording material according to the invention preferably comprises, as a substrate, e.g.

The method for producing a recording material according to the invention is characterized in that the component (s) is adhered to a water-insoluble, chemically oural mineral pigment, and the pigment is then applied to the substrate.

The coating of the substrate with said pigment is preferably carried out by a laminating machine with an air jet or a MeTer bar.

The coating composition preferably comprises a binder, which is preferably a starch or latex of styrene and butanol.

It is an advantage of the recording material of the invention that by using pyridyl blue it is possible to achieve that the recording mass is more resistant to the effects of atmospheric conditions, provides a more intense coloring of the copy and is resistant to darkness, maintains all the other advantages of a new chromogenic component adsorbed on the support.

Propyl blue is a new chromogem component, which has one of the following formulas:

5- (-ethyl-2-methylindol-3-yl) -5- (4-diethylamino-2-ethoxyphenyl) -5,7-ditydrofuran [3,4-b] pyridine- 7-on

7- (1-ityl-2-methylindol-3-yl) -7- (4-diitylimino-2-ethoxyphenyl) -5,7-dihydrofuro [η 4 -b] pyridin-5-one.

Each of these two isomers may be used in the recording maler according to the invention, although it should be noted that the pyridin-5-one isomer is more efficient.

Methods for producing pyridyl moods, as described, for example, in British Patent 1 367 567 and U.S. Patent 3,775,424, usually result in a mixture of both isomers and isolation of one of these isomers from this mixture in a conventional manner, such as ciromaaooraffi, is very difficult, time consuming and thus costly. It is therefore preferable to use the mixture as such, wherein the production of pyridyl blue is carried out under conditions which favor the formation of said more active isomers. In this way, a mixture is obtained which can be used in the production of the inventive recording material in which the more potent isomer predominates. The reaction develops with a blue color.

Examples of water-insoluble, chemically water-neutral pigments are calcium carbonate, zinc oxide, barium sulphate, titanium dioxide, barium nitrate, calcium oxide, magnesium titrate and magnesium sulphide. The most preferred pigment for recording mills according to the invention is calcium carbonate.

In making copies, the sheet on which the copy is to be produced is used either as an ecceptor sheet or as an acceptor-donor sheet, which is additionally provided with a backing layer of a color-forming developer encapsulated in a multicolour.

It is also possible that the solution of the bead-forming developer encapsulated in the ticglass is applied to the same side of the substrate as the pigment with the chromogenic component is applied or incorporated directly into the substrate.

The recording material support according to the invention is either made of plastic or preferably of paper.

The invention also relates to a process for the production of a recording crystal, which comprises adsorbing the pyridyl blue, optionally with a longer chromogenic component, to a water-insoluble chemically neutral pigment and then applying the mixture to the substrate.

Adeorption of pyridyl blue on. said pigment may be used by any suitable method. The only necessary requirement here is that the pyridyl blue be adsorbed to the pigment in a colorless form. It is possible, for example, to introduce the pyridyl mullion solution into the pigment layer as this is done by embedding the chromagraphic columns, and then pyridyl blue precipitates out of solution in the presence of the pigment in any known manner. This can be achieved, for example, by diluting the pyridyl molar solution with a solvent that is miscible with the original solvent but does not dissolve the pyridyl blue, or. by chemical nuurelization of an acidic aqueous solution of pyridylic mole, or by cooling the hot solution of pyridylic mole. evaporation of the solvent. Which of these methods yields a water-insoluble, essentially neuronal pigment on which pyridyl blue is adsorbed.

The pyridine-adsorbed pigment is deposited on a recording material support by any of the known methods used in the manufacture of pressure-sensitive recording materials. It is possible, for example, to use double-deck machines with a Mayor rail or a windshield wiper.

The coating slurry typically comprises water and a suitable binder, for example, styrene-butadiene latex and / or starch. In addition, the slurry may contain a small amount of additives commonly used in the coating of paper backings such as a wetting agent and a foam reducing agent.

More detailed information on the coating slurry and the coating methods useful in carrying out the method of the invention can be found in U.S. Patents 3,627,581, 3,775,424 and 3,853,869. The pigmented slurry containing adsorbed pyridyl moiety may be applied to the face of the backing sheet to obtain the acceptor sheet or to the face of the acceptor-donor sheet. The encapsulated developer solution can then be applied to the reverse side of another sheet to obtain a Soodrhd sheet or to the reverse side of an αOceptord-donor sheet. As already mentioned, it is an inverse arrangement of the dvoice ohromogenic component-developer as compared to the arrangement commonly used in the production of recording material.

The recording material should be arranged such that on its front side it contains both components forming the resulting color of the copy, the coating slurry may also contain the encapsulated developer solution in min.

Any developer commonly used for electrosensitive recording materials can be used for the recording material of the invention. It is however necessary that this developer may be dissolved in a disengaged ^ Z ^ le ^ ltěd and to you ⁱⁿ ° iávala color reaction in contact with the pyridyl Moody. Suitable examples of such developments are acidic novetate resins, such as p-phenol-dihydroxyaldehyde resin or p-octylphenoldoraldehyde resin.

The solvent for the acid developer may be any solvent commonly used in elective recording materials. Preferred examples of such solvents are Sibenzyl ether, an oil formed from a mixture of saturated aliphatic hydrocarbons. with a temperature of 160 DEG to 290 DEG C., benzyl benzoate, 2,2,4-triethyl-1,3-seottdidylsisulfate described in U.S. Pat. No. 4,027,065, Sulfate of 1,2,4-trimethylbenzoate, ethyldiftylmethyl. in U.S. Pat. No. 3,996,405, alkylbenzoy. having 11 and 12 carbon atoms in the alkyl moiety; and isdiprophyldiphenyl described in U.S. Pat. No. 3,627,581. The most preferred solvent is a mixture of Siieosyl ether and an oil of a mixture of saturated aliphatic hydrocarbons having a distillation temperature of 160 to 290 ° C.

Microcapsules for a solution of an acid developer in a solvent can be made of gelatin, as described, for example, in U.S. Pat. No. 3,041,289, from modoformium 81-dihydroxy polymer, as described in U.S. Pat. No. 4,001,140, formaldehyde as described in U.S. Pat. No. 3,755,190 or the various melamine-formaldehyde polymers described in U.S. Pat. No. 4,100,103.

The invention will be explained in more detail in the following with specific examples.

Example 1

Production of pyridyl blue

0.21 mol of quinolinic anhydride in 0.33 mol of 1-ethyl-2-methylindole was stirred in the reaction vessel at 65-70 ° C for 3 hours. Then, the reaction mixture was cooled and washed with benzene or chlorobenzene to give 0.19 mol of a mixture of (1-ethyl-2-methylindol-3-yl) - (3-kerboxypyridin-2-yl) ketone and its isomer.

g (OJ88 mol) of a mixture of (1-ethyl-2-methylindol-3-yl) (3-carboxypyridin-2-yl) ketone and its isomer is stirred for 2 hours at 60-65 ° C with 35.3 g (0.188 mol) of N, N-diethyl-m-phenetidine and 250 ml of acetic anhydride.

The reaction mixture is then poured into 500 ml of water and the acetic anhydride is hydrolysed by slowly adding 450 ml of 29% ammonium hydroxide. The mixture was stirred for 2 hours and the resulting solid was filtered off and washed with water, 200 ml of 40% methanol in water and 50 ml of petroleum ether, b.p. 60-110 ° C. Then the solid product is dried to constant weight in an oven at 75 ° C to give 80.5 g (90%) of 7- (1-ethyl-2-methylindol-3-yl) -7- (4-diethylamino- 2-ethoxyphenyl) -5,7-dihydrofuro [3,4-b] pyridin-5-one and 5- (1-ethyl-2-methylindol-3-yl) -5- (4-diethylamino-2-ethoxyphenyl) -5,7-dihydrofuro [3,4-b] pyridin-7-one 9: 1. Mp 134-137 ° C.

Example 2

Production of recording material in the form of an acceptor sheet containing pyridyl blue

(a) Dissolve 1 g of pyridyl blue in 150 ml of acetone. In addition, a mixture of 70 g of calcium carbonate, 20 g of the urea-formaldehyde pigment described in U.S. Pat. No. 3,988,522, and 10 g of zinc oxide are prepared. The resulting mixture was added to the solution and the resulting suspension was dried.

b) The product of step a) is then formulated into a slurry using the following components in the indicated amounts.

Table 1

Components Amount in used state (masses, parts dry matter (masses, parts) Composition in dry matter (%) Product from step a) 84 84 83.4 Modified Corn Starch 100 ALIGN! 10 9.9 Latex of carboxylated styrene and butadiene 12 6 6 Polymeric acid sodium salt solution 3 0.75 0.7. Water 250 - - Total 449 100.75 100 ALIGN!

c) The resulting overlay slurry is applied using a Mayer bar overlay

δ. 12 to 15.42 kg of paper and then dried. The dryness of the dry layer is approximately equal

2.04 kg per 500 sheets of 63.5 x 96.5 co.

Example 3

Production of recording material in the form of an acceptor sheet containing 3,3-bis-dimethylamino-phenyl) -6-dimethylaminootalide

The procedure of steps 2 (a), (b) and (c) of Example 2 is repeated, except that the pyridyl blue is replaced by crystal violet lactone, i.e. 3 _with 3-bis-di-diethyleoio-felO1-6-dioethylaoio-phthalium.

Example 4

A method of producing a record sheet in a form of an acceptor sheet containing pyridyl blue

(a) 300 g pyridylic seas, 600 g calcium carbonate, 300 g moodfied corn starch with 10% solids content, 30 g of 25% solids polymeric sodium carboxylic acid solution and 1 200 g of water are ground for 45 minutes with: a few drops of octanol, which is added to reduce foaming.

b) The product of step a) is then processed into a coating slurry using the following ingredients in said gratings.

Table 2

Komoooonty Composition in dry matter (%) using state (masses, parts) dry matter (masses, parts) Product in steps a) 6.3 2 3 calcium carbonate 43.4 43.4 65.8 Annilex clay described in U.S. Pat. No. 3,586,523 9.9 9.9 15 Dec Moodfied corn starch 66 6.6 10 Latex of carboxylated styrene and butadiene 8 4 6 Glassy powder of molten sodium and zinc phosphate 0.1 0.1 o, 1 Water 110.3 - - Total 244 66 99.9

The solids content is 27%; dynamic viscosity: 0.058 Pe.s

c) The resulting coating slurry is applied to 15 > 42 kg of paper and then dried. The weight of the dried layer is 2.04 kg or 500 sheets of 63.5 x 96.5 cm.

Example 5

Production of recording material in the form of an ecceptor sheet containing 3,3-bis- (dimethylaminophenyl) -6-dimethylaminophthalide

The steps a), b) and c) of Example 4 were repeated except that pyridyl blue was not replaced by 3,3-bis- (dimethylaminophenyl) -6-dimethylaminophthalide, i.e. crystal violet lactone and 300 g of calcium carbonate in step a). is replaced by 300 g of granular resinate. The resulting mixture has a solids content of 27% and a dynamic viscosity of 0.057 Pa.a.

Example 6

Production of donor and acceptor sheets

(a) Dissolve 1200 g of p-phenylphenol pirystyrene in 3200 g of dibenzyl ether and add, while stirring and heating pe, 1600 g of an oil of saturated aliphatic hydrocarbons with a distillation temperature of 160 to 290 ° C to obtain a solution. In addition, 200 g of ethylene-maleic anhydride copolymer having a molecular weight of 75,000 to 90,000 are dissolved in 1,800 g of deionized water while stirring and heating. The resulting solution is diluted with 6000 g deionized water and the pH is adjusted to 4 by adding the necessary multiplication! sodium hydroxide.

The above oil solution of p-phenylfmol resin is then emulsified in the solution in a Cowles apparatus at 25 ° C. The wash is continued until an oil droplet size of about 2 microns is reached, and all droplet size distributions fall within the range of 0.5 to 15 microns.

The resulting emulsion is then transferred to a water bath at 55 ° C and 1000 g of 90% etherified alkoxylamme in solution in 1000 g of deionized water are added with vigorous stirring. The resulting mixture was maintained at 55 ° C for 2 hours with continuous agitation to ensure capsule formation. After 2 hours, the temperature was allowed to slowly equilibrate to ambient temperature and the mixture was then stirred for a further 16 hours.

b) The microcapsule encapsulated p-phenylfmol resin is then formulated on a coating slurry using the following ingredients in the indicated amounts.

(Table 3 on the successor page.)

Table 3

Components Amount Composition in dry matter (%) used state (masses, parts) dry matter (masses, parts) Product from step a) 26.6 12.5 71.4 Starch protecting against premature disruption of microcapsules 3.2 3.12 17.9 starch 6.3 0.63 3.6

Latex of carboxylated styrene and buta-

diene 2.5 1,25 7, Water 26.4 - - Total 65 17.5 100 ALIGN!

The dry matter content is 27%; dynamic viscosity; 0,068 Pe.s.

c) The resulting mixture was used to coat 15.42 kg of paper and dried. The dry layer has a weight of 1.7 kg per 500 sheets of 63.5 x 96.5 cm paper. In addition, said coating layer is used to coat the reverse side of the sheets prepared by the method of Examples 4 and 5 to obtain acceptor-donor sheets.

Example 7

Production of donor sheets

(a) 1 400 g of an oily solution of p-octylphenol resin in 3 200 g of dibenzyl ether and 1 600 g of a mixture of saturated aliphatic hydrocarbons with a distillation temperature of 160 to 290 ° C shall be dissolved with vigorous stirring and heating. The oily solution is then encapsulated in microcapsules as described in Example 6a).

b, c) The steps b) and c) of Example 6 were repeated except that 27.3 parts by weight of p-octylphenol resin were used instead of 26.6 parts by weight in step a) and the mixture was used only to prepare donor leaves.

Example 8

Comparison of recording material containing pyridyl blue with recording material containing 3,3-bis- (dimethylaminophenyl) -6-dimethylaminophthalide

Recording materials containing pyridyl blue or 3,3-bis- (dimethylaminophenyl) -6-dimethylaminophthalide, i.e., 1 violet crystal violet, were subjected to a test to determine the color intensity of the copy in a standard manner by stacking a donor and acceptor sheet between which optionally, an acceptor-donor sheet was inserted. Thus, a copy of the printed pattern is made on the acceptor sheet or on the front of the ecceptor-donor sheet; the color intensity of the thus obtained copy is determined using an opacimeter.

The color intensity of the copy is a measure of color development and is expressed as the ratio of the reflectance of the image portion (the printed portion) to the reflectance of the non-image portion (the unprinted portion) multiplied by 100 '. colors·

The following types of copy color intensities were determined for comparison of the recording materials:

copy intensity A - corresponds to the original copy intensity 24 hours after copying;

color intensity of copy B - corresponds to the color intensity of the copy after the copy has been issued:

(a) fluorescent light

(b) natural sunlight

(c) ambient conditions

(d) oven temperature;

color intensity of copy C - corresponds to the color intensity of the copy, created on the recording material that was previously exposed:

(a) fluorescent light

(b) natural sunlight

(c) ambient conditions

d) oven temperature ·

For exposure to fluorescent light, a chamber was used which contained a panel with 18.13 W fluorescent tubes of 53.3 cm long, illuminated by white light. These fluorescent tubes were vertically mounted on 2.5 cm mats. Recording material tulle before or after copying stored at a distance of 2.5 to 3.8 cm from fluorescent lamps for 48 hours · Printing was done by typewriter ·

Exposure of the recording maaerial sheet before or after making a copy of the natural sunlight was performed by storing the recording maaial for 48 hours in a window facing the south side · Printed by typewriter using the letter X _and

The recording of the recording material before or after making a copy of the ambient conditions was carried out by hanging the recording material on the wall of the laboratory for 7 ei 9 weeks. During this time, the recording meate ^! exposed to air, natural and fluorescent light, temperature changes and various humidity · Type printing by typewriter ·

Exposure of the recording maaerial to the effect of elevated temperature in the drier was done by storing the recording material in the drier for 3 weeks at 60 ° C · Printing was done by typewriter ·

The results are shown in the following table.

Table 4

Content sheet Content sheet Color intensity of copy developer chromogenic components AND Ba) Ca) Example 6 Example 4 donorový I Sheet (acceptor sheet) 38 48 55 Example 6 Example 5 (donor sheet) (acceptor sheet) 51 74 78 Example 6 and Example 4 (acceptor-donor sheet) 49 51 56 Example 6 and Example 5 (acceptor-donor sheet) 52 68 75 Color intensity of copy AND Bb) Cb)

Example 6 Example 2

(donor blade) (acceptor sheet) 40 41 65 Example 7 (donor blade) Example 2 (acceptor sheet) 52 53 75 Example 6 (donor blade) Example 3 (acceptor sheet) 40 52 88 Example 7 (donor blade) EXAMPLE 3 (acceptor sheet) 56 74 96

Color intensity of copy

AND Bc) Cc) 7 weeks Example 6 Example 4 (donor letter) (acceptor sheet) 33 38 48 Example 7 Example 4 (donor letter) (acceptor sheet) 44 56 54 Example 6 (donor list) Example 5 (Bkceptor sheet) 34 45 72 Example 7 example 5 (donor letter) (acceptor sheet) 57 73 89

Developer content sheet Sheet with circulation Color intensity of copy AND Bc) 9 (Cc) weeks Example 6 (donor list) Example 4 (acceptance sheet) 32 42 44 Example 6 (donor list) Example 4 (acceptance sheet) 34 54 76 Example 6 and Example 4 (akeeptoro-donor letter) 33 42 45 Example 6 and Example 5 (akeeptoro-donors list) 3- 55 76

Color intensity of copy

AND Bd) CD) Example 6 Example 4 (donor letter) (acceptor sheet) 40 49 52 Example 6 (donor letter) Example 5 (acceptor sheet) 48 49 75 Example 6 and Example 4 (akeeptsro-dsnor list) 48 45 51 Example 6 and Example 5 (accepto? -morph sheet) 51 51 68

From the above results, it is clear that the recording mettrial of the invention represents a significant improvement over known recording materials in which crystal violet lactone is used at the same concentration. The recording materials according to the invention are characterized by a particularly improved resistance to the effects of atmospheric conditions and the ability to form an image with sufficient intensity and darkened with an intensity.

Claims (12)

SUBJECT OF THE INVENTION 1. A recording comprising a support on which a water-insoluble, chemically neutral pigment is deposited on one side of which a chromogenic component consisting of 5- (1-ethyl-2-methyl-thiol-3-yl) -5 is adsorbed - (4-iietytami.ts-2-etsxyfenyl) _-5) 7ddiУydrofuns [3,4-b] pyridin-7otnem and / or 7- (l-methylindole-ety1-2-3-yl) -7- (4- diethylamino-2-methoxyphenyl) -5,7-dilylphenyl [3,4-b] pyridine-Sonne. 2. A recording material as claimed in claim 1, wherein at least one further chimeric component is adsorbed onto the pigment. 3. Recording material according to claim 1 or 2, characterized in that it contains calcium carbonate as pigment. 4. A recording material as claimed in any one of claims 1 to 3, characterized in that it is provided with a layer of pressure-disrupted microcapsules containing a developer solution on the second steady pad. -. Recording material according to Claims 1 to 3, characterized in that the side of the pigment support contains even a layer of microcapsules which can be destroyed by high pressure and containing the developer solution or is incorporated into the support. no 6. Recording material according to claim 4, characterized in that it contains an acidic novolac resin coating as developer. 7. A recording material as claimed in claim 6, characterized in that it contains p-phenylphenolphaaldelyl resin or p-octylphenoformaldehyde resin as the resin. 8. Recording ma ^ Oá]. 6. The method of claim 1, further comprising paper as said substrate. 9. A method according to any one of claims 1 to 3, wherein the choomogenic component or choomogenic components are adsorbed onto a water-insoluble, chemically neutral pigment, and the mixture obtained is applied to a support. 10. Method according to claim 9, characterized in that the deposition is carried out by means of a Mayer rail or an air-jet. '' 11. A method according to claim 9, wherein a binder-containing coating composition is used. 1 12. The method of claim 11, wherein the binder is starch. 13. A process according to claim 11, wherein the binder used is a styrene-hutene latex.