DE1421467A1 - Carbonless material - Google Patents

Description

To produce copies of an original to be written by hand or with a typewriter, carbon or carbonless paper of the type commonly used in the trade is placed between the original and the copy sheet (s) which is cumbersome and time consuming in some ways. In addition, "it is easy to get your hands dirty and, if you are not careful enough, the writing paper too. This method of working is particularly cumbersome when it comes to form sets back with a Through honor are ibefarbe provided. However, this method has significant Sachtleben hurry _t as with Durchs chreibef ar be comparable

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If you see the back of the forms, you can easily see the documents underneath or stapled in the tray behind them can pollute.

One has therefore gone over to laying colorless protective layers over the copy layers, but no decisive success could be achieved with this either, since the sheets are ultimately intended to produce copies. Therefore, the through color becomes to a certain extent always also given unintentionally «In particular, it happens again and again that unintentionally Copies are produced when one is on a document, which has a carbon coating on the back, writes something «

In order to avoid these disadvantages, Dian has suggested the back of a sheet of paper with transparency ink to be colored so hard that copying on normal paper is impossible, but that this layer is on a Paper coated with a layer of wax on the surface probably writes off o The layer of color on this type of paper is there but still copies on plain paper since they still contains wax. It was therefore further proposed that the paper sheets for the production of copies without producing carbon paper in such a way that a wax-free color layer is applied to the back of the paper sheets is applied, while the front side of the paper sheet receiving the copy is covered with a layer of wax is provided · In this case, the paint layer can consist of a spirit, bensin paint or the like or glue paint are made with insoluble dyes.

In spite of these various proposals, it has not yet been possible to find a usable thru-rubbing material

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of the type described on the market. The reason for this is probably that the various proposals
were too general in nature and did not give any precise exemplary embodiments or instructions for the production of such a copy material.

The present invention relates to a copy material for producing copies without
Carbon paper which consists of at least two sheets, the back of one sheet being provided with an ink-releasing layer and the front of the second sheet being provided with an ink-receiving layer in such a way that the ink-releasing layer does not apply to ordinary paper
writes through it, while on the prepared surface of the color-absorbing layer a sharp, parbe des
receiving sheet results in well-contrasting, non-smearable writing, while at the same time the color-absorbing surface is prepared so that it is also printed as well
can be written on with ink or ballpoint pen.

It is an object of the invention to create a layer of paint which does not produce any Durohox marks on ordinary paper and which does not stain the hands when handled, but which is appropriately prepared on a paper
Scratch-through sheet with sharp edges and well contrasting
Copies result · For this purpose, it is proposed to use a color compound that contains one or more synthetic resins as a binding agent and at the same time one or more waxes and / or wax-like substances.

Contrary to the older proposals that the dye
and wax parts separately on different sheets, has shown that the color layer is better bound, remains harder and clear copies

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when the dyes are bound with synthetic resin to which certain proportions of wax or waxy substances are added alone or together · A layer of color that is bound with synthetic resin alone becomes too hard and does not write off even on a prepared surface · Through the Adding wax and wax-like substances loosens the paint layer and transfers it easily and with sharp edges to the prepared surface that will receive the writing at the areas under pressure.

Two examples of the implementation of this form of the invention are given below:

Example 1); ! Back: 4 jG polystyrene

5 % stearin 10 Ji BuB

81 jC trichlorethylene Application: 5/6 gr / m dry

Front; 5 g / ar ozokerite (EP approx. 75 0) Substances such as cetyl alcohol, raw montane, carnauba, KP-Waohs (brand name of the company Farbwerke Hoechst), candelilla wax, etc. can also be used instead of stearin. In cases where the waxes are only insufficiently soluble in cold solvents, they must be applied from a warm solution, e.g. in the case of trichlorethylene as a solvent at 60 - 70 ° C.

Example 2) s 6 j6 polyvinyl acetate (e.g. Mowilith's Farbwerke Hoechst)

10 i » Hohmontan

$ 15> graphite

69 1 ° toluene

Assignment? 5/6 gr / m dry

Because of the poor solubility of raw mono-

Tan in cold ioluene must be applied at approx. 70 ° C.

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Another embodiment of the invention is the production of a color layer in which a binder is used Synthetic resin, preferably a cellulose derivative, ζ · Β · ethyl cellulose, is used or at least one of these is "added" to a substantial part of the color layer According to the invention, layer is made from a mixture of one Solvent and nonsolvent for the synthetic resin applied, with but the solvent for the cellulose derivative must be more volatile than the nonsolvent. Such a mixture is e.g. a mixture of acetone and water, in which case the best binding agent is ethyl cellulose · After applying the color mass to the paper web, which is a synthetic resin and a mixture of loose and contains precipitators for the same, the paint layer is dried. Because the solvent for the cellulose derivative is easier is more volatile than the nonsolvent, it evaporates earlier, so that when it evaporates there is an enrichment of the dissolver comes »This leads to an at least partial separation of the plastic, whereby the paint layer turns white, because the plastic in the paint layer is in the form of finely distributed particles. This start-up effect can can also be achieved without the addition of nonsolvents to the original coating compound, if the nonsolvent is evaporated of the loser is supplied by the inflated air. For example, it is possible to use a solution of ethyl cellulose in acetone to be applied together with the corresponding pigments and tarnishing by blowing with a damp cloth To achieve air. If necessary, the air must be brought to the required water content by adding water vapor the.

This process has two advantages: the precipitation of the plastic results in loosening of the binder and at the same time the normal

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sometimes dark colored layer of paint through the whiteness run of the binder brightened «The paper therefore looks pleasant on the back and from the coating Since one normally looks at the front of the sheet of paper, practically nothing is noticeable · One sees the pure, unadulterated color of the paper without the annoying, dirty gray color on the front, like they have the previously known carbonless papers with the dark, black color layer »

During the inscription, the ink layer is transferred by the pressure of the writing tool to the recording sheet underneath, the copied characters appearing dark and just as dark as they would have been if the ink had not been healed as described according to the invention. The reason for this surprising effect is that the cellulose derivative, because * is contained in the color layer in the form of small particles in a loosened form, is compressed by the writing pressure and is therefore now contained in the color layer in the form of larger transparent particles, which in no way affect the actual dark color of the color substances «

An example of the implementation of the invention in this Form is the following:

Example 3): back side? 5 $ ethyl cellulose (e.g. N 100

from Hercules Powder) 15 1 ° graphite $ 67> acetone $ 13 water

This Mischune ^T / ill in a conventional manner on the back of a sheet of paper applied the dry coating is 5-6 g / m

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Front: It is made in a manner known per se. Ozokerite applied so that the dry application is 5 gr / m. The softening point is approximately 75 · ⁰ C.

Other plastics can also be used, ζ · Β · post-chlorinated Polyvinyl chloride, which, applied from a mixture of Triehloräthylen and gasoline, the described Effect delivers.

The described embodiments of the inventions βΜΠβ already results in the recognition that it is essential to put on hold the "coat of paint though so hard that they do not write off unintentionally and not soiled paper and hands, on the other side but on the pretreated surface clear copies with sharp edges results

This object can according to the invention also be achieved by increasing the proportion of pigments in the t arbabgebend s layer. In this case, however, it is particularly desirable to produce a light colored layer which only delivers dark characters through writing pressure, as has already been described above.

In order to achieve optimal precipitation of the plastic and thus tarnishing of the layer, it is proposed to increase the proportion of pigment. However, this cannot be done simply by increasing the content of colored pigment in the layer, because this would make it too dark and would no longer be smudge-proof. According to the invention, therefore, a certain proportion of non-coloring pigments must be added. Pigments are to be used, which are in optically clearly recognizable contrast to the color of the coloring pigment, ideally - when using black color pigments - white pigments · These additional contrasting

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pigments can either be opaque, such as titanium dioxide or zinc oxide, or only slightly opaque, such as e.g. kaolin or chalk. In either case, the amount is the. Choose different pigments so that the total amount made of camouflage pigment and contrast pigment for an optimal fine-grained precipitation of the cellulose derivative results in the necessary pigment content. At first it was not to be expected that despite the addition of e.g. white pigment, a copy material that produces dark copies with high color intensity. Rather, it was to be assumed that the white pigment would reduce the color strength of the color pigment to such an extent that the copies are also pale and gray would look like. Surprisingly, however, a copy material produced according to the invention provides high-contrast Copies of high color strength.

It is known that the presence of pigments causes the precipitation of plastic particles according to the invention promotes so-called nucleation. This results in a stronger failure and thus also a better brightening the dark layer of paint.

There are two different ways in which this form of the invention can be carried out. Either you take as much color pigment as necessary for the production of the color mass, is to achieve beautiful copies of high color intensity and add so much no or weak spots of the pigment, e.g. kaolin, that the amount of nucleating agent is corrected an optimal tarnishing of the layer caused by precipitation of the cellulose dorivatee contained therein

The other option is to obtain the required amount of pigaent by mixing Parbpigaent and deokendea contrast pigment, e.g. * lit anweiß, to achieve In

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This pall it is advantageous to adjust the amount of color pigment to choose higher because the opaque white pigment used at the same time enhances the color strength of the color pigment diminishes something.

You can also combine both methods and a mixture of color pigment, an opaque pigment and use a non-opaque pigment.

Example 4) :

5 parts by weight of ethyl cellulose 15 parts by weight of graphite 10 parts by weight of kaolin 60 parts by weight of acetone 10 parts by weight of water

Example 5):

5 parts by weight of ethyl cellulose 20 parts by weight of graphite

5 parts by weight titanium white 60 parts by weight acetone 10 parts by weight of water

Example 6):

5 parts by weight of ethyl cellulose 15 parts by weight of graphite

3 parts by weight of finely divided silica

(e.g. Aerosil from Degussa)

60 parts by weight of acetone 10 parts by weight of water

Example 7)

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5 parts by weight of post-chlorinated polyvinyl chloride

(e.g. Rheneflex from Dynamit-Nobel)

5 parts by weight of flame black

(e.g. lampblack 403 from Degussa)

15 parts by weight of kaolin

60 parts by weight of methylene chloride

10 parts by weight gasoline (boiling point 90-120 ° C)

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Example 8):

5 parts by weight of ethyl cellulose

5 parts by weight of Mtholrot (e.g. Litholrot BMD extra PuIv. of BASF)

15 parts by weight of kaolin
60 parts by weight of acetone
10 parts by weight of water

example 9) '.

5 parts by weight of post-chlorinated polyvinyl chloride (e.g. Rhenoflex from Dynamit-Nobel)

15 parts by weight of graphite

5 parts by weight whiting chalk

5 parts by weight of kaolin
60 parts by weight of methylene chloride 10 parts by weight of gasoline (boiling point 90-120 ° C)

The previous proposals for the presentation of the invention all had the color-releasing layer as their subject. The ink-absorbing layer is known according to the hitherto The proposals that have become generated by the fact that the front of the sheet, which is to receive the copies is intended, with a fine coating of wax, stearin, paraffin or a similar substance or mixtures covered by such. Will this surface with the color-releasing When the layer is brought into contact and applied writing pressure, the corresponding particles combine the ink-releasing layer with the ink-receiving Layer and stick firmly to it.

The previously known carbonless materials of this type have the disadvantage that the ink-absorbing front side the sheets of paper cannot be written on or can only be written on imperfectly by the usual means; it is but it is desirable that the paper sheets are properly printed and written on with ballpoint pen and ink can.

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Since this type of carbonless material is used in particular in the production of sets of forms, It is essential that the prepared sheet can be perfectly printed, since it is unsuitable in terms of production technology is to apply the preparation to the sheets only after printing.

The reason for the poor printability to be sought in the fact ¹ that the ink can not penetrate into the paper, but is isolated from the preparation layer against the paper · Attempts have been made to solve this problem so that the printing ink an excessive proportion added to siccatives, but this did not lead to any success in practice, as the printing inks quickly turned into a gel-like consistency and were then no longer usable.

In order to remedy this drawback, according to the invention proposed to expose the coating compound for the color-absorbing layer to metal soaps, which act as siccatives. It was found that according to the invention leaves prepared in this way, the printing ink dries just as quickly as when printing on an ordinary, unprepared paper.

In addition to the inadequate printability, there is often the disadvantage that the front side of the paper sheets intended to receive the copy cannot be written on with a ballpoint pen, so that afterwards? handwritten notes or corrections on the copy sheet are impossible, especially with the writing instrument most used today.

The proposed according to the invention the coating of metal soaps to the coating mask of the characters

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The receiving sheet not only improves the printability, but also results in perfect writability with the ballpoint pen “To achieve this effect, it is not necessary to rely on certain metal soaps to restrict «. However, since it is expedient to achieve both effects at the same time, one becomes according to the invention select the kind of metal soaps that guarantee both printability and writability with a ballpoint pen «

The effect of metal soaps in making the coating receptive to ballpoint pen color is not just that difficult to explain, but occurs quite unexpectedly »It was much more likely that a wax soap containing Coating compound cannot be written on with a ballpoint pen because ballpoint pen colors contain oil « In the Austrian patent specification 181.600, the oleophobic properties of metal soaps are very special highlighted and their use based on these properties recommended. So although the use of wax soaps is one because of their well-known oleophobic properties If this is contrary to professional prejudice, the addition of wax soaps to the coating compound goes against all expectations a perfect writability of the Yordirseite of the carbonless material according to the invention achieved.

By adding suitable pigments to the coating composition of the sheet that accepts the characters the writability with the ballpoint pen has been further improved will. It has been shown that this writability Although it can be improved with all metal soaps, individual metal soaps can be used for the desired one Effect less good, others are particularly suitable · But especially with the less suitable metal soaps

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has been shown that the writability by the addition of suitable. Pigments are greatly improved can·

In the case of the carbonless copy materials of the previously known type described, the ink layer receiving Also, the front of the paper sheets cannot be written on with ink.

When writing with ink, there is no closed Lettering, but the individual lines are made up of a chain of liquid droplets, creating the result is a very inconsistent typeface. These ink droplets dry only slowly on the prepared surface and do not adhere firmly even after drying.

The object of the present invention is therefore also to provide a carbonless material, the front side of which can be properly written on with ink. Essential for the invention was the knowledge that uniform Characters with a constant font width can only be created if the adhesive forces that occur during the writing process between writing fluid and recording medium are greater than the surface tension (cohesive forces) of the liquid, since otherwise the writing liquid on the recording material is always smaller lined up droplets will rest. The previously known and described ink-absorbing layers for Carbonless materials of this type were exclusive essentially composed of hydrophobic substances (e.g. ozokerite, paraffin, etc.) and therefore cannot be used with Ink can be written on.

According to the invention, it is therefore proposed that the coating compound To add wetting agent «It could

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that when using water-soluble metal soaps, e.g. sodium stearate, the paper sheet can be written on properly with ink. But wetting agents, such as alfcyl aryl sulfonates or fatty alcohol sulfonates be used. Non-ionic wetting agents such as polyglycols and their ethers and esters can also be used Find.

Wetting agents are known per se, but these are always used in the liquid phase. It would be it was obvious to add wetting agents to the writing fluid. But that is not practically feasible because the Consumers do not want to use a specialty ink for writing on carbonless materials of the described Kind of could be induced. Based on these considerations, it was necessary to look at the problem from the other side to dissolve, i.e. to make the preparation hydrophilic. It is therefore proposed according to the invention by adding To make wetting agents for the application mass of the layer with ink inscribable.

For the last described! Embodiments of the Invention, exemplary embodiments are given below:

Example 10): 30 parts by weight of zinc stearate are added

67 parts by weight paraffin melted together,

3 parts by weight of Aerosil are stirred in and this mass is applied from the melt to a carrier paper ρ * in a manner known per se. The order is approx. 3 gr / m ^. This order can be written on properly with the ballpoint pen.

Example 11): 70 parts by weight of oaokerite are with

30 parts by weight of lead stearate melted

and on a carrier paper in itself known

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ter way applied from the melt * The application is approx. 3 gr / m ² . Paper coated in this way can be "printed" perfectly, ie the printing ink dries at normal speed.

Example 12);

65 parts by weight paraffin and
35 parts by weight of stearic acid monoethanolamide are fused and applied from the melt in a manner known per se to a carrier sheet in such an amount that the application is approx. 3 g / m 2. Paper coated in this way can be perfectly written on with ink.

Example 13):

34 parts by weight ozokerite,
33 parts by weight of lead stearate and 33 parts by weight of stearic acid monoethanolamide are melted together and applied from the melt in a manner known per se. Paper prepared in this way can be written on with a ballpoint pen and ink, and the printing ink dries at normal speed after printing. "

Claims (11)

Patent claims: 1.) Copy material for making copies without carbon paper, consisting of two or more sheets of paper laid one on top of the other, on their front side have a coating with wax, waxy substances or a resin and the back has a coating with a mass of paint that can be used on normal paper 809806/0107 does not write off, but especially on the underlying Prepared sheet, characterized in that the color mass is a mixture of one or more as a binder Synthetic resins and one or more waxes and / or. contains several waxy substances. 2.) Copy material for making copies without carbon paper, consisting of two or more sheets of paper laid one on top of the other, on their front side have a coating with wax, waxy substances or a resin and the back has a coating wear with a mass of color that does not write on normal paper, but on the underlying paper, especially Prepared sheet, characterized in that the color layer in addition to the color pigment or other pigments contains other fillers that visibly contrast with the color of this color pigment. 3.) Process for the production of a copy-through material for producing copies without carbon paper, consisting of two or more stacked one on top of the other Leaves that have a coating of wax, waxy substances or a resin on their front side and which have a coating on the back with a color that does not write off normal paper, but on the specially prepared sheet underneath, characterized in that the paint is a plastic binder, preferably a cellulose derivative is added, and the color mass then consists of a mixture of Solvent and felling for the cellulose derivative is applied, where the solver is more volatile than the feller, so that the plastic tarnishes and thereby brightens the layer. 809806/0 107 4) Copy material for making copies without carbon paper, consisting of two or more stacked sheets of paper that have a coating of wax, waxy substances or on their front side wear a resin and have a coating on the back with a color mass that on normal paper does not copy, but on the specially prepared sheet underneath, characterized in that the color-absorbing Layer of metal soap contains 5 «) Carbonless material for making copies without carbon paper, consisting of two or more sheets of paper laid one on top of the other, on their front side have a coating with wax, waxy substances or a resin and the back has a coating wear with a mass of color that does not write on normal paper, but on the underlying paper, especially prepared 31att, characterized in that the color-absorbing Layer of wetting agent contains 6.) copy material according to claim 1), characterized in that the for the production of the color layer synthetic resin used as binding agent is polystyrene, 7.) copy material according to claim 2), characterized in that the fillers are weakly covering pigments be used" 8.) copy material according to claim 2), characterized characterized in that highly opaque pigments are used as fillers. 9 ·) Copy material according to claim 4), characterized characterized in that the ink-receiving layer is such metal soaps contains, which act as siccatives ·. «NqR06 / ü 1 07 10.) copy material according to claim 5) »thereby characterized in that alkyl aryl sulfonates are used as wetting agents will. 11.) copy material according to claim 5)> thereby characterized in that fatty alcohol sulfonates are used as wetting agents will. 8098Ü6 / Ü 107