DE1447747C - - Google Patents

Description

The invention relates to a photosensitive layer with at least one halogenated hydrocarbon, a Leukotriarylmethane dye, an N-vinylamine and optionally a binder.

The known photosensitive layers of the above-mentioned composition (German Auslegeschrift 1175 986) do not provide directly visible images, but these are only made through heating made visible. The photosensitivity is also not sufficient for all purposes.

The still known, only leukotriarylmethane dye and layers containing hydrogen halide (U.S. Patent 3,102,810) have a very high low sensitivity to light.

It is the aim of the invention to provide a layer of improved Photosensitivity to sharp, which provides a better picture quality and on the already at Exposing a visible image is created.

The invention is based on a light-sensitive layer with at least one halogenated hydrocarbon * ° substance, a leukotriarylmethane dye, an N-vinylamine and optionally a binder and is characterized in that it contains an N-vinyl carbazole as N-vinylamine.

What is surprising and unpredictable is that the vinyl compounds are not behave the same, but that only the N-vinylcarbazole the creation of an immediately visible image of the combination of leukotriphenylmethane dye / halogenated hydrocarbon raise awareness. The type of leuco dye is not critical here, but it outputs the large number of N-vinylamines, N-vinylamides und.der N-vinylimides only N-vinylcarbazole desired and described effect. The layer is also so photosensitive that back enlargements can be produced.

Suitable leukotriarylmethane dyes are, for. B. stated:

[(CH ₃ ) ₂ NC _e H ₄ ] ₃ CH

[(CH ₃ ) ₂ NC _e H ₄ ] ₂ -CH-C _e H ₅

Leuco crystal violet

Leuco malachite green

[NH ₂ -C ₆ H ₄ I ₂ C -C ₆ H ₃ (CH ₃ ) NH ₁ fuchsine base

40

45

[NH ₂ -CH ₄ I ₃ CH

Leucoparosaniline.

As halogenated hydrocarbons, there are very generally those which are halogen during exposure split off. In particular, halogenated hydrocarbons of the formula

R.
Rr

-C-X

55

are used, where X is a chlorine, bromine or iodine atom and R, R ₁ , R _{2 can be the} same or different and are equal to a chlorine, bromine, iodine or hydrogen atom of an alkyl group, optionally replaced by chlorine, bromine , Iodine substituted and / or a member of an aliphatic chain, an aryl, aralkyl, alkenyl or a heterocyclic group. In addition, polyhalogenated heterocyclic five-membered rings, such as tetraiodopyrrole, carboxylic acid chlorides and their derivatives and halogenated plastics, e.g. B. chlorinated rubber can be used.

The following are individual representatives of the halogenated hydrocarbons to be used according to the invention called. Pentabromoethane, hexachloroethane, w, w, w-tribromoacetophenone, benzotrichloride, cyanuric chloride, Iodoform, bromoform and hexachlorocyclohexane.

Particularly good results are obtained from: tetrabromomethane, ^ bromine-w.w.w-tribromoacetophenone, 2,4-dimethyl-w, w, w-tribromoacetophenone and / or 3-nitrov, w, w-tribromoacetophenone.

In addition to N-vinylcarbazole, there are vinyl carbazoles even especially its alkyl derivatives z. B. 3,6-dimethyl-N-vinylcarbazole mentioned.

To produce the layer according to the invention, a solution containing one or more leukotriarylmethane dyes, one or more halogenated hydrocarbons and at least one N-vinylcarbazole contains, applied to a layer support and the solvent evaporates.

The substrate material used is wood, glass, plastic film, metal foil, textiles and especially cellulose derivatives, such as B. cellulose triacetate and paper, into consideration. As a light source can be described in the Process conventional mixed light and UV lamps, but also normal lightbulbs are used will.

The exposed recording materials are fixed in a manner known per se, as in FIGS the following examples are described in detail

The photosensitive layer according to the invention has a substantial advantage over the known layers higher sensitivity to light. In addition, the light resistance of copies from a layer support and the photosensitive layer according to the invention significantly increased, especially compared to the copies made from leukotriarylmethane dye and halogenated hydrocarbon are emphasized got to.

Layer supports which have been provided with the photosensitive layer according to the invention are suitable for Production of both contact copies and reflex copies. Above all, the one described is suitable Copy material for the re-enlargement of microfilm.

Example 1

a) A base paper commonly used in the blueprint technique was impregnated with a solution of 0.1 g of leuco crystal violet, 1.5 g of tetrabromomethane and 1.0 g of N-vinylcarbazole in 10 ml of acetone. After the solvent had evaporated, a back enlargement of a silver film negative on a 1:10 scale was made on the copier material produced in this way with a 500 watt projector. The exposure time was ½ seconds. This was followed by washing out with gasoline, briefly rinsing with 0.5 ^e / y of sodium hydroxide solution and drying. A clearly visible blue image on a light background was obtained.

b) The same base paper as described under a) was mixed with a solution of 1.0 g of N-vinylcarbazole and 1.0 g of tetrabromomethane soaked in 10 ml of acetone and dried. That after an exposure of 30 seconds of colorless material was heated for 3 minutes at 100 ° C in a drying cabinet, with a weak yellow to light brown image appeared.

c) The same base paper as under a) and b) was made

soaked with a solution of 0.1 g of leuco crystal violet and 1.0 g of tetrabromomethane in 10 ml of acetone. After drying, exposure was carried out for 30 seconds in the same way as described under a). To washing with gasoline and spooling with S 0.5 ° / < > iger caustic soda was only a very weak one recognizable blue picture.

B e i s ρ i e 1 2

a) A raw '° commonly used in blueprint technique paper was made with a solution of 0.1 g of leuco malachite green, 1.0 g of tetrabromomethane and 1.0 g of N-vinylcarbazole soaked. After the solvent had evaporated, the copying material produced in this way was' back magnification with a 500 watt projector made of a silver film negative on a scale of 1:10. The exposure time was 30 seconds. After exposure, it was washed out with gasoline and briefly rinsed with a 0.5% sodium hydroxide solution and dried. There was a distinct green image on light ao Reason received.

b) The same base paper as under a) was mixed with a solution of 0.1 g of leuco malachite green and 1.0 g Tetrabromomethane soaked in 10 ml of acetone and dried. After an exposure time of 60 seconds and otherwise the same way of working as described under a), only an extremely faint green one emerged Image received.

Claims (3)

Patent claims: 1. Photosensitive layer with at least one halogenated hydrocarbon, a leukotriarylmethane dye, an N-vinylamine and optionally a binder, characterized in that that it contains an N-vinylcarbazole as N-vinylamine. 2. Photosensitive layer according to claim 1, characterized in that it contains one or more halogenated hydrocarbons of the formula R ₁ > CX contains, where X is a chlorine, bromine or iodine atom and R, R ₁ , R _{x can be} identical or different and are a chlorine, bromine, iodine or hydrogen atom of an alkyl group which is optionally substituted by chlorine, bromine, iodine and / or is a member of an aliphatic chain, an aryl, aralkyl, alkenyl or a heterocyclic group. 3. Photosensitive layer according to claim 2, characterized in that it contains tetrabromomethane, ^ Brom-w.w.w-tribromoacetophenon, 2,4-dimethylw, w, w-tribromoacetophenon and / or 3-nitro-w, w, w-tribromoacetophenone.