DE1571895A1 - Color transmission medium - Google Patents

Description

The invention relates to a color transfer medium which is one of having a transfer layer received on a carrier.

The porosity of paper is necessary to make a paste or to be able to suck up liquid transmission medium. The drying of the transfer medium on the paper takes place in most cases by spreading and holding the transfer medium by means of capillary action. Especially with carbon papers with a pasty Transfer medium is not just a drying process, but also a mechanical connection between the waxes of the transfer medium and the fibers of the paper. In summary, it can be stated that the setting of the transfer medium on a porous or fibrous writing surface, such as paper, is not a particular problem.

However, it has not previously been possible on non-porous or non-porous other sohreibunterunterlagen poorly absorbing a transmission medium to achieve a satisfactory image. Such

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_BATH ORIGINAL

smooth writing pads are generally transparent or translucent and consist of a plastic, for example from Polyätfcylenglykolterephthalat. The invention makes it possible to achieve an exact, smudge-proof image on such writing pads, thereby that the carrier consists of a smooth, non-porous material and that the transfer layer is made from an intimate mixture of a pressure-sensitive material composed of wax and a resin consists of printing ink, the latter being at least two thirds of the weight of the transfer layer. The color transmission medium according to the invention is long-lasting even under extremely unfavorable environmental conditions, is without additional units in normal typewriters can be used and produces sharp, smudge-proof impressions.

Further features of the invention can be found in the claims.

Details of the invention are given below by way of a preferred one Embodiment described.

In the exemplary embodiment, transparent plastic films are to be used a typewriter ribbon. Lightfast printing ink as an imaging material becomes less durable Color preferred. The product is dry and under normal conditions of use not sticky and not dirty. The base material for a typewriter ribbon is preferably a cheaper one Polyethylene film used, which is smooth and non-porous.

The product is manufactured using solvent-based coating processes. Dissolved and dispersed mixtures of the transfer layer are applied directly to a 0.01-0.013 mm thick polyethylene film used in an amount such that the thickness of the finished transfer layer is a predetermined thickness within the range of Is 0.005 to 0.01 mm.

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The transmission layer mix is structured as follows:

Material straightening part (dry)

Channel black 80

Uricury wax 10

Usually sticky silicon

resin (SR 521) "5

SR 332 5.

The above channel black diminishes in addition to its excellent ones Imaging properties the internal strength of the transfer layer thereby allowing rupture and transfer. Channel black is a finely divided, deep black solid substance. The Farbabs ehe idling modifies the color and shade of the printer's ink, v; ie is known.

The Uricury-YJachs is intended to prevent peeling and is intended to reduce the internal strength of the transfer layer. This wax is hard, firm and dry, but breaks after a type impact; to allow separation of the solid transfer layer along the type outline. In this embodiment, an equilibrium must be established in order to achieve a reduction in the internal strength of the transfer layer so that an interruption and transfer can take place along the projections of the type mold; it also creates a transmission medium that does not peel off under normal bending and twisting. A mixture of 80 pounds of dye and 20 % wax gives a transfer medium that does not peel; however, this transfer medium cannot be used on substrates which ■ do not accept dye. On the other hand, a mixture of 90 '/ o dye and 10 ^ silicon transmits satisfactory, but the transmission medium scrolls even under normal conditions, and the printed image is poor.

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In the preferred composition, the wax binds the entire transfer sheet together to prevent peeling under normal use. Tests have shown that the wax can vary in a range of 2 to 10 parts by weight versus 80 parts by weight of printing ink. A high wax content counteracts the pressure-sensitive properties, which is desirable overall for the transfer layer. The portions similar to the above mentioned compositions, however, have a greater than -10 parts by weight of wax-containing fraction, show a reduction of over ^tra Sbarkeit the transfer layer onto a blotter from a plastic. On the other hand, however, other hard wax-like substances are regarded as equivalent to the aforementioned wax, such as phenol resins, carnauba wax, candelilla wax and sugar cane wax. '

In the above composition, the silicon resins form the Basic ingredient that gives the pressure-sensitive properties. The two resins used differ only slightly. Both are used in the preferred composition and it is believed that using 10 parts of both resins will work for most Application forms gives a satisfactory result. Silicon solid do not tend to build up crystalline structures like it is clearly visible, especially with silicon glass. It is the quasi-amorphous nature that appears to be active in the invention. Under the Under the influence of a printing type, the silicon resin forms a dense coating on the substrate in areas corresponding to the scope of the type shape. The silicon tries to wet most of the substances; this wetting forms a completely smooth line of the circumferential shape the type. This shape is maintained by means of an adhesive, while the normal reverse motion of the typewriter ribbon pulls away the remaining transfer media. · Others Pressure sensitive materials can also be included within the scope of the invention be applied. With polyvinyl ethylene ether of low

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Molecular weight have been given satisfactory results;, though does not achieve the excellent properties of the silicon resin became.

It must be emphasized that an important feature of the invention resides in the solid and dry state of the transfer layer. Although silicon is normally sticky when dry, the transmission medium is devoid of this property under normal conditions of use and working pressures because the further added materials suppress this property of silicon. A typewriter ribbon made according to the invention can therefore be wound onto a spool in a conventional manner and can be moved through the machine with known conventional transport devices. Under the high pressure of the abutting type body, the properties of a pressure-sensitive adhesive are created, whereby an image of a character produced by impact is permanently produced on normally ink-repellent surfaces. ■■ -...

The tape is produced with the help of a solution coating known type. The machine provides a role which is partially in a crucible is immersed, which receives the liquid mixture. These Roller applies the liquid mixture to the carrier. The carrier is continuously moved to drying stages. The above mixture is kept liquid in the manner described below.

The channel black precipitated with paint is dispersed with 1, 1, 1 trichloroethane in a ball mill at room temperature. The dispersion It contains 12 1/2 percent by weight Kanal-Schwarz.

The Uricury wax is dissolved in toluene (phenyl methane). To speed up heat is applied to dissolving the wax. The solution "contains 20 percent by weight wax. .

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Silicon resin 521 and silicon resin 582 are commercially available as solutions of 55 % resin in toluene. The dry residues are commercially available as pressure sensitive adhesives.

The four ingredients are mixed in the above proportions by stirring at a heat of 71 C. A not necessary at this stage of the process.

by stirring at a heat of 71 C. A grinding or grinding is

After a liquid coating and evaporation of the liquids the end product appears dry and solid under normal pressure and temperature conditions. The product can be in an ordinary Typewriter can be acted upon in a conventional manner with types. The imprint that can be produced on a smooth writing surface is created at the same time as the surcharge of the type. Furthermore, with it a very strong opaque image obtainable as a result of the high ink concentration. . -

Although the transfer layer has an internal strength, as already mentioned mentioned above, it need not be "large". Some conventional transmission media and typewriter ribbons .transfer images to writing pads that are color-repellent are. However, the characters transmitted are liquid, paste or otherwise not liable. They can be smeared or wiped away with a light touch. The said inner Strength, which is essential to the invention, creates an imprint that is smudge-proof against the pressures that print media can normally be exposed to.

Excellent results have been obtained when printed on Polyethylene glycol terephthalate, polyethylene, polyamide and rubber chlorohydrate. Only legible results were given on cellophane. The reasons for this can be understood from the teaching of the invention. The pressure-sensitive material must adhere to the writing surface

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stay. Transfer layer materials that have significant grain properties are excluded from the start. Additionally However, jiiersu would have a strong rejection reaction between the pressure-sensitive material and the writing pad adversely affect the adhesion,.

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Claims (5)

Claims 1.jParbübertragungsmedium having a recorded of a carrier ^ transfer layer, characterized in that the carrier consists of a smooth, non-porous material and in that the transfer layer of an intimate mixture of a particulate wax and a resin pressure-sensitive material and of printing ink is the latter constituting at least two thirds of the weight of the transfer layer. 2. Parb transmission medium according to claim 1, characterized in that that the printer's ink embodies canal black. 3 color transfer medium according to claim 1, characterized in that that the resin is made of silicon resin. 4. Parb transfer medium according to claim 1, characterized in that that the carrier consists of polyethylene. 5. Parb transfer medium according to claims 1 to 4, characterized in that that the transfer layer has a thickness in the range of 0.005 to 0.01 mm and at least 80 parts by weight of channel black, at most 10 parts by weight of a hard, dry wax and contains at least 10 parts by weight of silicon resin. 109824/0076