DE862753C - Recording material which emits color when pressure is applied in places - Google Patents

Description

The invention relates to a cover for paper or the like under lagemateri al. Of the Coating gives when pressure is applied in places liquids trapped therein for paint delivery to a surface over which the coating is placed is off.

In particular, the invention relates to a recording material, ζ. B. paper, for reproduction purposes, in which the trapped liquid contributes to an underlying layer Application of localized pressure is delivered; e® is by one when using such breakable coating marked in places draws which is an unrelated inner phase of a non-hygroscopic, oily, one Contains dye-entraining liquid of low polarity and low viscosity.

The drawings illustrate an example of execution the invention.

In general, the coating consists of an emulsion, one of a liquid agent and a dispersed, non-hygroscopic phase, which is preferably of the oil type, of less Has polarity and low viscosity; the two phases are covered by a strong intermediate layer separated. The emulsion prepared in this way is coated on paper or the base material; the outer phase containing the volatile agent dries to form an elastic, breakable film, which contains the internal or dispersed phase in the form of tiny liquid inclusions.

It is desirable that the coating produced be resilient and breakable; for this reason will be plasticizing agents in the outer phase

introduced in the form presented, although they Can be omitted entirely if the application conditions are met justify that. The inner or dispersed phase has this in excess! can add-Hch ziu dem. oil of low polarity still off. Chosen- include pigments, coloring liquids, or liquids produced by chemical Reaction · or by contact with another Surface react.

ίο Bai dlem so ^ coated paper or urater sheet material, which pressure is applied and which is applied with the coated side on an underlying layer is at Diruckanwenidlu-ng by a stylus, a type or another installation of the cover broken, to release the liquid inclusions from their cells, allowing them to remove the underlying one Touching layer.

It is therefore within the scope of this invention to produce a coherent external phase, which contains two types of such oil locks; the latter are chemically separated from each other, but if a stylus or pressure member breaks the coating in places, a local one takes place Union of the two kinds of cells; ■ the chemical reaction causes local coloring; the inclusions responded to the coated Paper or on the breakable outer phase. Such a heterogeneous cell exhibiting Film is known per se, but there is e.g. B. the liquid of this well-known film that contains the dye carries, made of glycerine, which: does not have the properties of the liquid, which in the present invention are required. That is, glycerin has a relatively high level Viscosity and is * also hygroscopic; the according to the invention However, liquid has exactly the opposite properties.

An example of the formation of a liquid emulsion for coating paper follows.

External or contiguous phase:

Gelatin 20%

Saponiin,, 1%

Water, 79%

Inner or disjointed phase:
Paraffin oil (viscosity 140 to 160 Saybolt

at. 38 ^A ) .. .. ... 47%

Chlorinated! Diphenyl (approx

54% chlorine) 47%

Tetralmethyldiaminioidipheniylphthalide. . 2%
Thymol 4%

The inner and outer phases are in the Ratio of r: 1 emulsified. Other dyes or Pigments can if desired instead of tetramethyldiaminodiphenylphthalide be taken.

A second emulsion is made as follows:

External or contiguous phase:
Methyl celcilose (extra low viscosity) 10%
Water 90 ⁰ / »

Internal or non-cohesive phase:

Paraffin oil (viscosity 140 to 160 Saybolt) 49% Chlorinated diphenyl (approx

54% chlorine), 49%

Tetraimethyldiamine / Diphenylphtbalid .. 2%

The ratio of the inner to the outer phase is 1: 2.

Examples of liquids of low polarity and low volatility: paraffin oil, naphthenic oils, Castor oil, claw fat, ethyl phthalide, ethyl glycolate, pork fat, Olive oil, chlorinated diphenyls, tributyl phosphate.

Examples of marking chemicals for the inner phase: reactive: tetramethyldiaminodipihenylphthalide; Colorants: SudanIV; Pigments: carbon black.

Examples of emulsifiers for internal use Phase: thymol, phytosterol, cholesterol.

Examples of solid, shaping agents for the outer phase: gelatin, casein, methyl cellulose.

Example of an emulsifier for the outer phase when it is the mentioned fasting forming agent Agents added: saponin ..

Example of a liquid desiccant for the outer phase: water.

The drawing shows the paper layer to be coated 10, what the outer dried on it Phases with the liquid inclusions 13 of contains low polarity. If the coated film side of the paper: with an underlayer 14 in Contact is set and if on the uncoated side of the prepared layer in places Pressure is applied, such as B. by a stylus 15, the breakable film is broken. This allows the coloring liquid to escape and the top surface of the underlayer, as shown in Figure 16. It: it is evident that the inclusions unite through the S a visible color on the coated On paper or on the film itself, if it is reactive.!

The usual laboratory procedure is used for emulsification. It:. is desirable :, the proposed internal phase of the emulsion ¹⁰ - add ⁵ of the outer phase, while the outer phase is moved.

Claims (1)

Claim: Recording material, e.g. paper, which, when printing in places, color submits, gdierrazeich.net through one at the application such a coating that is breakable in places under pressure (e.g. gelatine, methyl cellulose " coating), which is an incoherent inner phase of a non-hygroscopic, oily, low polarity, low viscosity liquid including a dye contains. 1 sheet of drawings © 5615 12.52