DE1107079B - Image transfer process using the silver salt diffusion process and materials for it - Google Patents

Description

The invention relates to a silver salt diffusion image transfer method using an image receiving layer containing an amphoteric metal oxide as the active medium for the conversion of the transferred Containing silver complex in a metallic image in such a process.

The classic silver salt diffusion transfer process, that in the US. is often called "peel apart" or "DTR", z. B. U.S. Patent 2 352 014 or in Chapter 16 of "Photography, Its Material and Processes" by C. B. Neblette, 5th edition, published by D. VanNostrand Company, Inc., New York, 1952. This method includes on the one hand the use of a light-sensitive negative material made of silver halide and on the other hand the use of an image receiving layer on which an image from the photosensitive Negative material is transferred after exposure and during processing of such material. In this way, the exposed photosensitive material is in an organic black and white developer in the presence of a silver halide solvent, e.g. B. sodium thiosulfate, sodium thiocyanate od. The like., and is, while it is still moistened with developer, with the image-receiving layer brought into contact containing a fogging or nucleating agent, such as. B. colloidal silver, silver sulfide, Colloidal sulfur or the like. Contains. The silver halide developer reduces the exposed silver halide in the photosensitive material to metallic silver, while the silver halide ! solvent converts the unexposed silver halides into a silver salt complex that is applied to the image-receiving layer is transmitted. The fogging agent in the image receiving layer causes the silver halide salt complex is reduced to a metallic silver image or to a permanent dark one Silver salt picture, e.g. B. silver sulfide is converted. The touch between the treated photosensitive Material and the receiving layer is then interrupted, and the processed photosensitive Layer is peeled off. In this way, excellent marks are made on the image-receiving layer Obtained dark images on a light background. The silver salt diffusion transfer process has have acquired a wide range of applications in the field of photographic and reproduction, there are However, certain limits are set for him. If these limits could be overcome, this would be it Process for photography and reproduction even more valuable. With a typical shape this process becomes the image-receiving layer with the light-sensitive material during processing brought into contact with it. Here

Image transfer process

according to the silver salt diffusion process

and materials therefor

Applicant:

General Aniline & Film Corporation,
New York, NY (V. St. A.)

Representative; Dr. W. Schalk, Dipl.-Ing. P. Wirth,

Dipl.-Ing. G. E. M. Dannenberg

and Dr. V. Schmied-Kowarzik, patent attorneys,

Frankfurt / M., Große Eschenheimer Str. 39

Claimed priority:
V. St. v. America 13 July 1959

Steven Levinos, Vestal, NY (V. St. Α.),
has been named as the inventor

however, in most cases only a single copy can be obtained. This is due to the fact that despite the excellent mechanism of the process the photosensitive silver salts do not work with maximum effectiveness be exploited. Needless to say, the process is of greater importance would obtain as at the time when particularly well several copies of a single light-sensitive Material could be made.

Furthermore, various fogging or nucleating agents for use in the receiving layer has been described. Most often, however, in practice either colloidal Silver or silver sulfide used. When using silver compounds, albeit in small ones Quantities, the cost of the procedure is increased. The cost could of course be further reduced when the silver complexes through the use of a relatively inexpensive agent in the receiving Layer can be effectively converted.

According to the present invention, it has been found that the above-mentioned limitations are indeed extensive can be corrected when an image receiving

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Layer is used, which an amphoteric metal- The developer can be one of the usual organic oxide, which is capable of decomposing the over-black-and-white developer, especially a led silver salt complex to precipitations, which contains those, the Metol and hydroquinone . Some developers likely to be metallic silver are listed below after the receiving layer has seen, assuming that the development has been exposed to degradable or UV light. The essence of the silver halide solvent instead of such an image-receiving layer in silver occurs:
Salt diffusion transfer processes and the by- ^ j ^ _eto j ^ 5

conducting the diffusion transfer process with ' _Hydroc hi " _{non 6} 'o"

such an image receiving layer, including the io Crystalline Sodium Sulphate ". '.'. '.'. '.'. '.'. 50.0 g

Exposure of the novel image receiving layer with crystalline sodium carbonate 100.0 ξ

L · V- or white light after the silver salts- potassium bromide 1.0 g

plexes were transferred, is the subject of the inven- Water on .101

manure. υ -ο- j t. · Ο Vv

The new process can be varied to the extent that 15 ^ß "hydroquinone 13.0 g

depending on whether the absorbing material is separated and sodium sulfate 40.5 g

regardless of the photosensitive material or potassium bromide 2.a g

is part of the same. If the photosensitive Phemdon 1.0 g

borrowed material and the non-photosensitive image- sodium hydroxide 10.0 g

^{Reception layer} separated and independent of each other 20 ^ ^{ater aut 75U} ' ^{Ü ccm}

and physical contact under pressure C. Hot water 750.0 ecm

is required to transfer the silver salt- Metol 0.08 g

To achieve complex effects, the procedure can be anhydrous sodium sulfite 40.0 g

using the following process steps through sodium carbonate monohydrate 50.0 g

be carried out: * "25 potassium bromide 5.0g

1. The object to be reproduced, e.g. B. a Do water to 1.01

kument, is upside down, with

the emulsion side of the photosensitive ha- When processing in a single bath that

brought into contact with the silver photographic material, the developer and the silver halide solvent

and exposure is through the back side 30, if desired, then the developer

of the document in a contact copier - 20 to 300 g of the silver halide solvent per

tion, liters of the solution added.

2. The light-sensitive material is in a variety of already known organic silver halide Developer developed; solvents, e.g. sodium thiosulphate, sodium thio-

3. After a short rinse with water and the decyanate, ammonium hydroxide or the like, you can do this removal of excess water with a can be used.

The rubber squeegee is the light-sensitive ma- The amphoteric metal oxides, which in the absorb-

material with a silver halide solvent can be used in the layer, zinc oxide, titanium

a common device in which it can be on-tandioxide, zirconium dioxide or silicon dioxide,

with an amphoteric metal oxide 40 when coating these water-insoluble oxides

coated layer is brought into contact, it is recommended to put it in water-soluble colloidal

moistened; Binders such as gelatine, methyl cellulose, poly-

4. After a short vinyl acetate or the like, the two materials are dispersed. Preferably Contact time, about 1 minute, from each other is a 20 to 50% aqueous dispersion of a drawn and separated; 45 of these oxides in a solution of 50 to 100 g des

5. The receiving layer is used with white or colloidal vehicle per liter. The colloidal UV light exposed, whereupon a positive image is required to ensure that the carrier or a duplicate of the original is obtained. Oxides to the surface of the base layer of the

In this process, the decomposition of the SiI carrier layer will be bound. The base layer of the salt complex, which is preferably porous and consists of paper or the like, was transferred to the receiving layer 50, probably by the amphoteric. Bipack «is then a black silver deposit is formed. In dry conditions, the paper base layer is covered with a layer over the amphoteric metal oxide surface, even made up of a colloid and a dispersion of amphoteric metal oxide dispersed therein in the presence of the silver compound, relatively light-sensitive. In this way the system is through, and the colloid is by suitable drying after the moist amphoteric metal oxide hardening agent, such as. B. mucochloric acid, molded layer z. B. was exposed to UV light, »self-aldehyde or the like., Cured. After drying it is stabilized «. Instead of the previously described layer with an uncured silver coating, it is also possible to coat the developer and the halide emulsion layer, preferably a Ge silver halide solvent according to that in the pre-latin silver chloride emulsion,
The material can then be combined by exposing the drive in a bath. photosensitive material in a contact copier

For photosensitive material, one of the devices under a template, by developing, currently for silver salt diffusion transfer treatment with a silver halide solvent process commercially available light-sensitive and by washing out the exposed silver halide photographic paper be used. Preferably emulsion with a gelatin solvent, such as. B. A high-contrast silver chloride paper is used, whether organic sulfonic acids, for example sodium, the same - as already mentioned - not deciding salt of naphthalene-1-sulfonic acid, the sodium salt dend is. 7c of a butylated naphthalenesulfonic acid and the like, ver

Claims (1)

5 6 will be working. After removing the light-sensitive product, it was then placed in a bath The borrowed layer is the hardened layer, which treats the following composition: photere metal oxide bears, exposed to UV light and sodium salt of naphthalene-1-sul- dried. _{It goes without saying} that at Fntl » _{lira inr} . _r -. Trri · τ »- ■ · ·· - ΙΟΠ is dU Tc IUU ¹ si this procedure only one copy of a single 5 sodium thiosulfate 240 g Silver halide element can be made. Water to 1000 ecm The invention is illustrated by the following examples explained, although it is not limited to this. After a few minutes the emulsion layer became treated with cold water, whereupon they For example ^{10 was} washing. The layer coated with zinc oxide was then exposed, whereupon in the zinc oxide 75 g of gelatin were dissolved in 1 l of water and a copy of the original was obtained in a layer.
in this solution 250 g of zinc oxide and a small one Amount of saponin dispersed as a dispersant. Patent claims:
The dispersion was applied to a paper base layer 15 1. Image transfer process after the silver and the coating was dried. Salt diffusion process, characterized in that The photosensitive material was developed in a conman the exposed emulsion in an organic tact copier under an original exposed black-and-white developer, which developed unstated and in the developer A mentioned above. Halosilver thinned by treatment of the emulsions After a brief rinse with water, the over-sion was removed with a halide silver solvent in a lot of water with a rubber squeegee. Silver salt complex converting the halogen silver-The photosensitive paper was then moistened with a complex by touch to an image-receiving fixing solution that transfers 240 g of fixing soda per liter of water containing a coating of a material and with the zinc oxide over- amphoteric metal oxide, such as Zinc oxide, titanium suit-own receiving layer in a 25 dioxide, zirconium dioxide and silicon dioxide, has conventional silver salt diffusion transfer processes in and this image receiving layer is exposed.
Brought in touch. The two layers were peeled off from one another after about 1 minute, characterized in that the treatment with the Ha-zinc oxide layer was z. B. exposed to UV light, log silver solvent to the development process whereupon a copy of the original was obtained. 30 follows. 3. The method according to claim 1, characterized B ei game 2 shows that the treatment with the halosilver solvent simultaneously with the development The procedure according to Example 1 was repeated, the silver halide emulsion was carried out,
However, the fixing soda to the developer was added. The method according to claim 1 to 3, characterized and the contact between the light indicates that sodium thiosulphate is used as the silver halide solvent and the image-receiving layer,
during the development of the photosensitive material 5. The method according to claim 1 to 4, whereby geterials took place. indicates that the image receiving material is used in Example 3 ⁴ ° in the form of a layer which is different from the Halogen silver emulsion is independent. The process according to Example 1 was repeated, 6. Process according to Claims 1 to 4, characterized in that however, the zinc oxide denotes by an equivalent that the halide silver emulsion and Amount of titanium dioxide was replaced. the image receiving material in the form of a uniform _. 45 borrowed "bipacks" can be used. Example 4 ₇ Photosensitive material for the An image receiving layer was according to Example 1 according to claims 1 to 6, consisting of produced, but the gelatin by combining a paper base layer with a hardened using formaldehyde. The layer is provided with a water-soluble colloid layer, was then with a soft-working chlorosilver 5 ° which an amphoteric metal oxide, such as zinc oxide, gelatin emulsion coated and the coating on- titanium dioxide, zirconium dioxide and silicon dioxide, finally dried. contains, this layer with a soft The photosensitive emulsion was coated in a con-halogen silver emulsion.
A tactile copier in contact with a line 8. Material according to claim 7, in which the colcopy of a document is exposed and the material developed in a loid layer of gelatin and the amphoteric metal developing the aforesaid developer A. The de-oxide consists of zinc oxide. © 109 607/375 5.61