DE1761678A1 - Writing set made of color icon papers - Google Patents

Description

Hanover, June 21, 1968 Verw. Ht / Schm

Writing set made from color reaction papers

The invention relates to form and copy sets with only partial copying capability, as they have been known from the land in the field of single-use carbon papers and carbonation printing. Both products, both the disposable carbon papers and carbonized forms, have been replaced in form sets by color reaction papers for some time. Color reaction Papicre such products for the production of records and copies which are used to transfer writing, color reactions, ie chemical processes are those in which under the action of writing pressure until a readable colored font corresponds ^e is made up of two components which itself initially colorless or are almost colorless. DBP 1 127 920 describes such a recording and duplicating material using a λ color former from the group of spiro-dipyrans.

Color reaction papers are usually created by coating a color carrier (paper) with an oil / water type emulsion. Such coatings are only possible over large areas. If the carbon copy is only required in a few places in a set of forms, so large areas of valuable coatings must be "wasted" because they are not used.

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Now it is known to also use waxy liquids small partial areas of a transfer sheet to be applied cleanly and with sharp edges. The invention makes use of this known printing method and produces only partially coated dye reaction sheets afterwards.

The invention thus relates to a writing set or set of forms called color reaction papers, the original sheet of which is on the back with a closed layer of an emulsion of the oil / water type with the color former, whose Middle sheets on the receiving side (front side) have a coating of acidic pigment (acidic Clay) and are only partially printed with a layer of wax on the back which the color reaction component is embedded. Like the middle sheets on the receiving side, the binding sheet contains a layer of sour clay.

Form sets after the invention have the great advantage that they can be created much more economically than the sets of forms based on color reaction papers previous type, since it is no longer necessary to remove the reaction layer at the points with a To cover a top layer (neutralization layer) that prevents the color-forming reaction, so that the covered areas are not written through. Significantly lower consumption of raw materials also has an advantageous effect. Another great benefit The invention lies in the fact that the form manufacturer, provided that they have suitable machines grout, you can print the wax layer on the back yourself. You can use it to save time and money in form design and production

109832/0062

all work so far and need more cost-saving No longer ordering the reverse side imprint from the paper manufacturer.

The preparation of German writing and form sets according to the type described is, however only possible if a component is used for the color-forming reaction that is both in the Emulsion of the type oil / water soluble as well as dissolved in wax can be accommodated.

This is particularly the case with the color reaction components, as described in DBP 1 127 920 and have been placed under protection, the case.

The attached drawing explains the invention in an example, of course.

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Claims (1)

Claim Form set using color reaction papers, which are used as color reaction components Spiro-pyrans are used, characterized, that the back of the entire surface coated sheets of this set of forms the color reaction layer wear as an emulsion of the oil / water type, while the leaves used only in places for copying wear the color reaction layer on the back only in these places, with in In this case the color reaction layer is applied on a wax basis, while the receiving layer in all cases is a uniform one Layer of acidic pigment is. 109839/006?