DE2039931C3 - Pr13 08 69 Japan 64039 69 Leuco printing ink for stencil or stencil duplication printing processes - Google Patents

Description

On the other hand, there are chlorinated isoparaffins, which incorporate additives such as waxes and fats obtained by chlorination of isoparaffins or oils, natural high molecular compounds, considerably yellowish colored oils that are not only gene, thermoplastic synthetic polymers intrusive smell, but also the disadvantages and the like, for the purpose of improving the printed parts easy elimination of hydrogen chloride and ability as a printing ink and control of flow easy discoloration of the dye precursor in the case of ability and thixotropic properties, (3) earth Heating to 50 to 130 ° C when the dye- heating the mixture to dissolve the dye precursor should be solved therein, show. Precursor in the solvent and at the same time for

That is why the use of chlorinated iso-dissolution or melt is the auxiliary agent among paraffins as the main solvent in Leukodruck- io formation of a uniform solution, cooling under colors unfavorable. Stirring to precipitate part of the total

The solvent according to the invention for the amount of the auxiliaries in fine particles in the Lö-leuco printing inks consists of chlorinated n-paraffinization of the dye precursor in the chlorinated one with a viscosity of 0.2 to 25 poise η-paraffin, in which case more than 1% min bei 25 ° C with a degree of chlorination of more than 15 at least one of the auxiliaries, which individually or 30% to less than 60%. When the viscosity value is used in combination of two or more of below 0.2 poisen will become a solid-liquid without solution in the chlorinated one Separation of time in the production of Leukodruck- η-paraffin remains and due to precipitation when staining obtained so that the separation of the oil cool in fine particle form is behaved so that becomes easy, and materials over 25 poises are 20 the chlorinated η-paraffin in nets or grids of the too high a viscosity to maintain good printed images, and (4) required to achieve the exit arches. if adding finely divided cellulose powder,

Furthermore, in chlorinated η-paraffins with powdered gum arabic or short fibers,

a degree of chlorination below 30% the dye, for example from polyamide or polyester,

precursors difficult to solve and those with 25 when practicing the process is

a degree of chlorination of more than 60% makes it possible to have two or more kinds of chlorinated

sit a high viscosity and easily give a η-paraffins with different viscosities and

Elimination of hydrogen chloride. Degrees of chlorination as the main solvent

The chlorinated η-paraffins can usually turn and also 1 to 20% auxiliary solvents

in a proportion of around 30 percent by weight to be added.

drew on leuco printing ink, to be used. Particularly superior solvents for leuco

in particular, excellent printed images are made with we- printing inks according to the invention is a mixture

nig stains in the screen print on the construction paper from 80 to 90 parts of chlorinated η-paraffin with

obtained when a leuco printing ink with a degree of chlorination of 50% and 12 to 14

chlorinated η-paraffin with a viscosity of 35 carbon atoms and 20 to 10 parts of a chlorinated

1 poise to 13 poises is used. η-paraffins with a degree of chlorination of

Furthermore, the leuco printing inks with 30 to 35% and 12 to 14 carbon atoms,

chlorinated η-paraffin as a solvent for the As auxiliary solvents can in the context of

Pigment base extremely low mist formation, for example liquid paraffin, silicone oil,

on the stencil-printed sheets on which 40 alkylbenzenes and the like are used. Also can

due to the solubility of the resin layer on a less than 5% chlorinated isoparaffin

Typewriter stencil paper is caused to be mixed.

as they are often used for stencil duplication printing. The leuco printing inks according to the invention are generally packaged in a tube compared to the known ones or can be leuco printing inks containing chlorinated diphenyl by releasing small amounts when they are used; so z. B. a fog formation on the whole as printing ink for a rotary copier th surface of the printed sheets from 400th to or duplicator are used, will each -600. printed sheet in the former case and in the latter case preferably in the form of leuco printing inks used from 100th to 150th printed sheets without stains on the sheets. Therefore, there is an extremely difficult 5 ° hand or cloths in the pressure stage,
remarkable difference in the number of sheets to be printed by applying a stencil paper to the sheet of leuco printing ink. Like the application of the leuco printing ink to a carrier, which has already been mentioned above, the chlorinated ones are resistant to the leuco printing ink, and in an η-paraffins they have various superiorities as a soldered frame-like state. Examples of dissolving agents for dye precursors, such as those used in Leukoger, include cell glass, inks coated with polymer films, not only counter-paper, synthetic polymer sheets and over-chlorinated isoparaffins, but also over-chlorinated diphenyl coated with different types of polymers, which is an excellent or coated polymer.

Netes solvent for the previously known Leuko- Von Leuco printing inks, which with this

represents printing inks, in view of the lower 60 printing ink in a thickness of 200 μ on one

Mist formation coated by stencil paper for writing substrates became 200 to 300

machines caused, lower odor, low-pressure sheet received. In the stage of the matrix

other toxicity and costs. printing using leuco printing sheets

A typical example for the production of the leuco becomes one by means of optical, electrical, thermal

printing color is given below. 65 or mechanical working methods open die

The following steps were applied in combination to the ink-coated surface of the

applied, (1) mixing a dye precursor leuco printing ink sheet brought and so that the

with chlorinated η-paraffin as solvent, (2) single-tone coated paper with the matrix surface in

Contact comes by means of a roller for transferring the leuco printing ink from the openings the stencil on the clay-coated paper and for the formation of color images corresponding to the openings the die pressed on the clay-coated paper and the mass production of printing material is carried out easily and with great success by repeating this operation.

The invention is illustrated below by means of examples.

example 1

A mixture of 95 g of chlorinated normal paraffin (degree of chlorination 43%, viscosity 2 poises at 25 ° C) and 2.0 g crystal violet lactone was used at a temperature below 65 ° C for dissolution heated. After adding 18 g microcrystalline wax with a melting point of 70 to 72 ° C the resulting mixture was heated to 75 ° C so that a uniform solution was obtained. These Solution was cooled to room temperature with stirring and a pale greenish pasty Obtained leuco printing ink, which contained precipitated microcrystalline wax. If the Leuco printing ink on construction paper through the stencil paper openings was duplicated, clear blue images were obtained on the printing sheets. With With this leuco printing ink it was possible to print more than 500 sheets of thick material without damaging the To obtain stencil paper; furthermore, the material was odorless.

A mixture of 95 g of chlorinated normal paraffin (degree of chlorination 50 to 52%, viscosity 12 poise at 25 ° C), 5 g of castor oil and 1.5 g of rhodamine-B-lactone were heated to dissolve. Then were 12 g of Spermaceticum, 2 g of paraffin wax with a melting point of 68 ° C. and 3.0 g of a polystyrene Molecular weight for this under BiI-

the

contained latex and paraffin wax. The opaque paint was applied darkly to a warm cell glass, so that a space was created

Sch the openings of the stencil paper are pressed unddrfS red print images on the clay-covered Spier received; this operation was again-Sft and receive more than 300 sheets of the same printing material.

Example 3

To a mixture of 90 g of a chlorinated paraffin (degree of chlorination 50%, viscose, * SVoise at 25 ° C) of a 'chlorinated' paraffin with a degree of chlorination of 30% ^{(V ^ OS1} ^ _n , poise at 25 ⁰ C) and 2.0 g of 3-methyl-2 2-s _P Iroii _{(benzo [7]} chromen), 12.0 g geblechtes beeswax added.

The resulting mixture was then reduced to Π U L-zur Dissolution heated and taken to room temperature Stir cooled, producing a pale green uch paste-like leuco printing ink "was folded.

When the leuco printing ink through a wax matrix paper was applied to a clay-coated paper with openings turned deep green Reproductions made on clay-coated papers.

Claims (3)

Degree of chlorination in the range from 30 to 6Oe / o chlorine, claims: based on weight, and a viscosity of 0.2 to 25 poises at 25 0C 1. Leuco printing ink for stencil or Ma- In general, the dye precursor is colorless trizen duplication printing process, containing 5 and forms a color on contact with an elekeira solvent, at least one colorless material that accepts the dye, so that a printing ink containing the dye precursor material precursor dissolved in this solvent is colorless or and fine particles of at least one of the materials is at most slightly colored. Therefore, if there is no wax, grease, oil and thermoplastic syn- a conventional paper with the printing ink is made of high molecular weight compounds, no clearly printed images will be obtained. Is any weight, characterized in that on a paper coated or impregnated with an electron-accepting solvent from a chlorinated η-Par material with a degree of chlorination in the range of, which is subsequently referred to as clay-coated paper 30 to 60 ⁰ zo of chlorine, prints on the Based on weight, is designated, clear color images are formed, and a viscosity of 0.2 to 25 poises at 15. The leuco printing ink according to the invention contains 25 ° C consists of a chlorinated η-paraffin, the dissolved a colorless one 2. leuco printing ink according to claim 1, characterized by dye precursors and an aid for issuing characterized in that the chlorinated η-paraffin has a good printability, for example a wax. Contains 8 to 26 carbon atoms. Fat or oil or a synthetic high molecular weight 3. leuco printing ink according to claim 1 or 2. ao compound. The one in these solvents characterized in that the chlorinated dissolved dye precursor gives a deep color in η-paraffin with one of the auxiliary solvents flüs- contact with a clay-coated paper, however Sigen paraffins, silicone oils and / or alkyl, a dye precursor dispersed therein does not produce any benzene is mixed. deep color, even in contact with a tonal »5 pulled paper. That is why the maternity or stencil printing inks that contain the dye contains precursors as a coloring component of the common known printing inks from pigment The invention relates to a suspension-type leuco printing ink for stencil or matrix printing Stencil or stencil duplication printing 30 in view of the fact that the dye precursor is in travel. the carrier material must be dissolved. So far, as known solvents in Ma- As examples of dye precursors in the frame Trizen or stencil or screen printing inks, the invention are leuco derivatives of dyes which contain a colorless dye precursor, such as leuco crystal violet or leucomethylene blue, for example chlorinated diphenyl, castor oil, linseed lactone derivatives of dyes, such as crystal violet oil, phthalic acid esters, u. used. It is also known lactone, lactam derivatives of dyes, such as Rhod, that the most effective solvent consists of chloramine-B-lactam and spiro compounds such as 3-merated diphenyl (cf. DT-AS 1812 380, thyl-2,2-spirobi (benzo [f] -chromen) listed.
DT-AS 1 247 348, DT-AS 1 275 550, GB-PS 852 131 Preferred examples of solvents for these and U.S. Patent 3,104,980). 40 dye precursors include chlorinated n-paraffins, This chlorinated diphenyl, however, is more than 0.5 percent by weight, based on the agent for printing inks, which dissolve and ren, for example in screen printing processes, of the dye precursor in amateur printing solvents, because of a rapid color formation rate develop it in the stenciled or matte-coated paper,
Trizenbogen for the typewriter penetrates and 45 The chlorinated n-paraffins are generally colorless in addition an intrusive odor and toxic or slightly yellowish and known not to be toxic. Has properties, unfavorable. It was therefore desirable to replace these harmful, toxic solvents with more suitable η-paraffins as they increase. the chlorination (percent by weight of chlorine). So can From DT-AS 1 226 610, DT-AS 1 191 836 50 z. B. a chlorinated η-paraffin, which consists of an n-par- and DT-PS 853291 it was also known to have 12 to 14 carbon atoms with an affinity Chlorination products as binders for printing ink chlorination to 50% consists of using more than 6 weights. According to this prior art, percent of the dye precursor, for example however, no colorless dye precursors 3-methyl-2,2'-spiro (benzo | f] -chromen) were used at habit. 55 licher temperature, but an equal n-par- According to the invention it has now been found that affin, which is 20% chlorinated, can only Chlorinated normal paraffins were very effective as a solvent for 1.5% by weight of this dye precursor are a printing ink that provide colorless dyes. Furthermore, chlorinated n-paraffins are more includes runners. than 20, for example 20 or 24 carbon atoms, The leuco printing inks for stencils or stencils are of high viscosity and are used in a chlorine dye duplication printing process, Containing a degree of approx. 5O »/ o very viscous oils and solvents, at least one colorless, in this the one continues with a degree of chlorination of over Solvent dissolved dye precursor and fine 70% solid. Particles of at least one of the materials wax, chlorinated n-paraffins with a degree of chlorination Fat, oil and thermoplastic synthetic compounds of 30 to 60%, however, have a high solubility of high molecular weight, according to the dye precursors, and are chlorinated Finding is characterized in that the solution diphenyl with regard to the color formation rate from a chlorinated η-paraffin with a strength on construction paper is superior.