DE1198388B - Process for making non-smear carbon paper - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

B41n

German class: 151-7 / 02

Number: C 21797 VI b / 151

File number: 1198 388

Filing date: June 29, 1960

Opening day: August 12, 1965

The usual carbon papers have been known for many years and are the most widely used duplication sheets today They are made by coating paper with a layer of molten, pigment-containing wax. After cooling, you get a carbon paper, the one Layer of wax that can be transferred under pressure, in which a pigment such as carbon black or graphite is homogeneous is distributed.

It has been recognized that these known carbon papers have many serious disadvantages. Due to the homogeneous distribution of the pigment in the entire wax layer, the carbon paper stains Contact and must therefore be handled by the user with great care. Another one The problem is that the transmitted image, ζ. Β. Machine or handwriting, also when touched rubs off and smears with normal handling.

Another important disadvantage of these known carbon papers is the large amount of pigment, which must be used, most of which is wasted.

It has also been proposed to use non-lubricating carbon papers, especially hectographic papers Carbon papers, to be made by applying a coating to the carbon layer that contains no soot or no hectographic dye. Such a coating makes the carbon paper self non-lubricating, but has no effect on that transferred from the carbon paper Image that continues to smear and smear when touched and with normal handling.

It is an object of the invention to produce carbon paper and ribbons that are light colored and do not rub off when touched. The backing can be paper or any plastic film such as cellulose acetate, cellophane, polyethylene terephthalate (Mylar), vinyl polymers, etc.

Another object of the invention is to make carbon paper and ribbons that are smudge proof Transfer images with colored or magnetic pigments.

Another object of the invention is the manufacture of carbon papers and ribbons under Use of less pigment than was previously possible.

These and other objects are achieved in accordance with the present invention. In the drawing represents

F i g. 1 is a schematic cross-sectional view of the transfer sheets of the invention on an enlarged scale dar;

Process for the production of
non-smear carbon paper

Applicant:

Columbia Ribbon and Carbon
Manufacturing Co., Inc., Glen Cove,
Long Island, NY (V. St. A.)

Representative:

Dipl.-Ing. E. Prince

and Dr. rer. nat. G. Hauser, patent attorneys,

Munich-Pasing, Ernsbergerstr. 19th

Named as inventor:
Douglas Alexander Newman,

Glen Cove, Long Island, N.Y. (V. St. A.)

Claimed priority:
V. St. v. America November 20, 1959
(854342)

F i g. Fig. 2 is a schematic cross-sectional view, on an enlarged scale, of a copy sheet made of carries an image transferred from the new transfer sheets.

It was found that by the invention Avoid the many difficulties that arise from the use of conventional carbon papers and cleaner, better looking carbon paper and ink ribbons can be made. In the invention, a pigment solution or dispersion is applied to the surface of any conventional brittle wax layer, which is supported by an underlay sheet 10, applied and this mass heated to the softening or melting temperature of the wax, the liquid pigment carrier evaporated and the pigment seeps into the wax layer 11 and is absorbed by this. When cooling down therefore the wax of the transfer layer solidifies again over the pigment layer 12, which is kept close to the surface of the wax. In this way, the pigment layer is protected against

509 630/265

3 4

agitation in handling isolated, as it is through the z. B. alcohol, water, petroleum ether or vinegar solidified wax is coated. Likewise, it is ester to be soluble. Therefore, ethyl cellulose is called

also insulated against contact with the backing sheet, binding agent preferred as solvent for ethanol, As it does not completely cover the wax layer, it should be noted that when using

Underlay sheet has penetrated, as shown in Fig. 1 5 of a water-soluble binder with water as a solution

shown in the drawing. (using one of the usual wetting agents, such as

When applying pressure against the reverse diamyl sodium sulfosuccinate, should be added side of the transfer printing medium, ζ. B. by pen, In a further embodiment of the invention Pencil, typewriter type or stylus, one can put the wax layer on the backing sheet Image transferred onto a copy sheet 20. This io their application on the paper in the usual way Image is smudge-proof as it is way pigmented on its surface. It was z. B. found contains no pigment, the surface of the picture that if the wax layer with a blue or that is that part of the transfer printing layer that is that of another light-colored pigment such as titanium dioxide The base of the carbon paper was initially. The top or another white pigment is pigmented surface of the picture is therefore made of clean wax, 15 and then melted with a black or and the pigment layer 12 is coated beneath this top with another dark colored pigment area included, as in F i g. 2 of the drawing is shown, the transfer printing medium looks much lighter than will. To make sure that the wax softens when the blue or white and the black in one or melts just the right amount so that that would be mixed, but with that under pressure exaggerated pigment is absorbed and covered, it is necessary that the image has a darker color than one with Temperatures in the range of about 66 to 120 ° C expected the bright appearance of the arch apply. The duration of the heating is dependent. The reason for this seems to be mixing the melting point of the wax layer used or the melting of the pigments under pressure and the temperatures used, but in general to be. If there is a white pigment in the wax layer is only heated as long as the bow 25 ment has been used, so it turned out to be surprisingly needed, around the heating device at normal speed, so that the carbon paper formed is running at high speed a coating machine to both black and white copy sheets to run. can reproduce. For example, a

In another form of the invention, the white copy sheet is duplicated and so it appears Pigment dispersion a non-volatile plasticizer 30 resulting image black, apparently due to distortion. After the pigment dispersion has been applied, the white pigment of the image and the sion on the wax face and heating up to the white background, is done with the same arc Melt causes the plasticizer that the pigment is duplicated on a black copy sheet, so is wetted and settles and at the touch the resulting image appears white, apparently as a result surface mixed with the wax layer or mixed with a mixture of the black pigment of the oil. Bows and ribbons produced in this way have the one with the black background. This self-improved one Dry abrasion properties, and the shaft is particularly important, e.g. B. in manufacture Transferred images show an increased rejection of debit and credit sheets, in which either the Resistance to smearing. Soft, debit or credit column a black rear maker, The oils contain such as vegetable oils, Poly-40 Grund is given. Although only one appears alkylene glycols such as water-insoluble polybutylene - only carbon paper is used, the have glycol, and esters such as butyl stearate and tricresyl items on the receipt or copy sheet in phosphate, give excellent results. black, while the balance or debit account is in

In a further form of the invention it will appear white or vice versa. A binder was also added to the pigment dispersion, and it was found that titanium dioxide or another white substance with or without the plasticizer. This under- pigment in the wax layer on the backing sheet supports the formation of an improved dispersion and can be incorporated and magnetic is mixed, for example in a Waring mixer, iron oxide or another magnetic pigment. The wax layer is coated with the dispersion by means of the melting method and, as described, heated or can be heated. After the transfer, the white pig melts over it. Through this heating, the magnetic iron oxide on the rest is so that the image surface causes a mixing, and thus itself is hidden or appears very light-colored, a relatively hard surface, which the pigment remains magnetically sensitive in every way,
The following examples are only given to the veranda binder and the underlayer of 55 illustration and are not restrictive. Obviously, the under- ground is mixed up.
layer with the binder, so that a particularly example I
clean arc results. Any

Substance can be used that is at least partially This example shows the basic step of

can be mixed with the wax layer of the base. 60 application of an unmodified pigment dispersion

Plastics such as ethyl cellulose, methyl cellulose and on a sheet covered with wax. It contains

Hydroxyethyl cellulose can be used in the following steps:

the. Any brittle wax can also be used, such as 1. Ordinary Kraft paper becomes more common

that used in the wax layer of the base, thickness with a layer of a wax composition

Just like whale rat or cetyl alcohol, they are successfully coated with the following ingredients:
use. Preferably the binder should not

Can only be mixed with the wax underlayer, but carnaubau wax 30.0%

also at least partly in the carrier of the pigment, raw montan wax 1.5%

Claims (1)

5 6 beeswax 2.6% composition 1 and a plasticizer in the pigment di-lanolin 3.0% dispersion of composition 2, as defined below. Mineral oil 150 ° / o ^ '^ In step 1 of Example I, standard xr j · iVi "',". ";" '; O', n, Kraft paper is coated with wax. Low molecular weight polyisobutylene .... 2.4% 5 The wax-coated paper of the above lecithin 0.5% step 1 is then divided into two portions A dispersed mixture of one of the following two compositions: 2. This wax-coated paper is then coated on tongues: the wax surface is coated with a pigment dispersion, such as, for example, graphite dispersed in alcohol: Composition 1 The amount of graphite used is of the ug ^ 0, depending on the desired color strength on the sheet, ", '' ''. '.'" '"' ,. ' rto, and the setting is within the experience of the 15 alcohol (ethanol) 98% expert. Ethyl cellulose 1% 3. A portion of the product from step 2 is then heated to a temperature of about 38 ° C to draw off the composition 2 of the alcohol This graphite or carbon black 1% sheet is useless when it cools down, since the graphite is only on the 20 alcohol (ethanol) 90% wax surface and is rubbed off when handling the sheet. Dow Polyol B-500 4. Der The remainder of the product from step 2 is now (water-insoluble polybutylene glycol) .. 9% heated briefly by steam to a temperature of about 100 to 108 ° C in order to melt the wax Then the heating is stopped and the sheet is allowed to cool down to a temperature between about 104 and 108 ° C. This sheet is colored when it is touched, heated for a short time, around the wax blade Doesn't take care of that and provides pressure-resistant underlay sheets that melt and absorb the images. 30 binder-containing pigment dispersion to allow example II borrowed. After cooling, these sheets do not discolour when touched, have a light color. This example shows the use of a binding, and the image formed is a dark-colored and medium-containing pigment dispersion, a plastic does not smear. Backing material and magnetic pigment. 35 The substances and specified in these examples 1. A thin sheet of polyethylene terephthalate compositions are for illustrative purposes only, film (Mylar) with a thickness of 0.012 mm is used and professional modifications can be made without another layer of wax transferable under pressure. So z. B. any of the usual Coated with the following composition: waxes based on animal, vegetable, mineral Carnauba wax 54.5% 4 ° or synthetic base instead of the two Raw montan wax '.'. '.'. '.'. '.'. '.'. '.'".'.'.'.'.'.'.' 2.8%, ^s P ^ielen .use deducted, and the proportions _. ,. _ ", Can be adjusted according to the requirements in the end product Beeswax 4.7% to vary desired hardness or tack. Lanolin 5.6% It turned out to be beneficial as a pigment dispersant Mineral oil 27.5% 45 sion commercially available dispersions of carbon black Lecithin 0.9% ° the graphite in water-insoluble polyalkylene Low molecular weight polyisobutylene ''. '.'. '. 4.0 % to use stoles, ζ. Β a 10% dispersion of graphite in water-insoluble polybutylene glycol. 2. The wax-coated Mylar is then treated with a 20% dispersion of coated with a pigment dispersion made from magneti- 50 use graphite in isopropanol. The pigmentschem Containing iron oxide and ethyl cellulose binder - dispersion can also be composed by the alcohol in approximately the following proportions: Mixing the desired pigment in the desired Magnetic iron oxide 39.3% ^th amount with a water-insoluble polyalkylene Alcohol (ethanol) 58.7% ^ f ¹ - ". .... ",. ,. _{K,, ] T.} 55 Instead of the pigments listed, Ethyl cellulose 2.0% hectograph dyes such as crystal violet or 3. The product of Step 2 above then turns into lithographic pigments such as Nigrosine Black and Bis Use steam to a temperature of about 104 to maroon brown. 108 ° C heated for a few minutes to give the wax the Melting and absorption of the wetted pigment 60 patent claims:
to allow. After cooling, the carbon sheet shows excellent cleanliness, and the 1st method of making unimprinted image does not smear and is completely sensitive to magnetic carbon paper based on table scanning. pigment-containing wax layers, characterized in Example III ^6s that an underlay sheet with a layer of pressure transferable This example shows the use of a binding wax coated on the wax surface means in the pigment dispersion of the joint dispersion of a pigment and a volatile . term carrier applied, then the sheet is heated to a temperature at which the Wax layer softens with absorption of the pigment and the volatile carrier evaporates, whereupon one cools with solidification of the wax layer. 2. The method according to claim 1, characterized in that a Layer of pigment-containing wax is applied. ίο 3. The method according to claim 1 or 2, characterized in that on the wax layer a a dispersion containing a non-volatile plasticizer is applied. 4. The method according to claim 3, characterized in that a water-insoluble plasticizer is used Polyalkylene glycol is used. 5. The method according to any one of claims 1 to 4, characterized in that the dispersion is a Contains binding agent. 6. The method according to claim 5, characterized in that the binder is ethyl cellulose, Methyl cellulose or hydroxyethyl cellulose is used. 7. The method according to any one of the preceding claims, characterized in that an underlay sheet plastic film is used. 8. The method according to any one of claims 1 to 7, characterized in that a magnetic Pigment is used. 9. The method according to any one of the preceding claims, characterized in that the wax layer heated to a temperature of 66 to 120 ° C to soften. 1 sheet of drawings 509 630/265 8.65 © Bundesdruckerei Berlin