DE1547935A1 - Process for fixing an image-wise exposed recording material - Google Patents

Description

(Registration from H 46 963 IXa / 57b)

The present invention relates to the fixing of exposed recording materials on photosensitive Preparations made from Leuco Crystal Violet or Leuco Opal Blue or similar leuco bases of triphenylmethane dyes based, and the organic acids which are also intended to improve the photosensitivity to visible light and contain acid anhydrides »

The object of the invention is now to provide such an exposed To fix recording material in a special way and thus to achieve a special stabilization.

The recording materials to be treated according to the invention consist of a) a leuco compound of a triphenylmethane

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• colors of fs, Id) an organic acid anhydride, a halogen-substituted one Acetic acid or a halogen-substituted phenoxyacetic acid as a sensitizer, c) a "when heated

. Ammonia or an organic amine-releasing compound, d) optionally a binder and e) optionally a layer support. The recording materials can also contain other customary constituents, contain Z ₀ as plasticizers, when they exercise no adverse effect. The fixing according to the invention takes place in this case by heating the recording material O

In another embodiment, the recording material consists from a) a leuco compound of a triphenylmethane dye, ' b) an organic acid anhydride, a halogen-substituted one Acetic acid or a halogen-substituted phenoxyacetic acid as a sensitizer, c) optionally one Binder and d) optionally a layer support ", In. This is where the fixation takes place by bringing it into contact with it Ammonia, an organic amine, preferably an alkylamine or an alkaline solution,

1. Leucobase.

The photosensitive materials used in the recording material to be fixed according to the invention include the Leucov bases of triphenylmethane dyes, such as, for example, Leuco Crystal

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.; Violet. The leuco bases of other iriphenylmethane-- ' dyes are used, including the leuco bases of the general formula:

^R 2

in which? R ₁ , R ₂ 1 R? and-R. stand for a hydrogen atom or an alkyl, aralkyl or aryl group and can be identical or different, and R _{5 stands} for a monovalent radical -H

or -N ^ »in which R ₁ and R _{9 have} the above meaning. ²

Suitable leuco bases are, for example, Leuco Opal Blue, Leuco Crystal Violet, Leuco LIalachite Green, Leuco Brilliant Green, Leuco Victoria Blue, Leuco Methyl Violet, and similar leuco bases.

2. Activator or sensitizer.

Anhydrides of mono carbonic as well as polycarboxylic acids can be used be used. Halogen-substituted acetic acids or phenoxyacetic acids can be used as acids.

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3, substrate.

The leuco base and the activator are preferably dissolved in order to facilitate mutual mixing and, if necessary, to remove them on an inert substrate such as paper, plastic or another material. In this way a thin coating is then obtained. Instead of, or in addition to, a layer support, it is often useful in the solution To use a film-forming plastic made of Leucobase and activator as a binder, especially if one is not absorbent layer support, such as glass or a plastic that has not been provided with an adhesive layer, as the layer support for the light-sensitive preparation. Of course, such a binder can be omitted,

when the solution of Leucqbaee and activator is applied to an absorbent support such as filter paper ,will. Both the solid support and the binder are selected from materials that are different from the rest Components of the photosensitive preparation are chemically inert.

The preferred binder is polystyrene instead of polystyrene however, other polymers composed of vinyl or vinylidene monomers and film-forming cellulose derivatives can also be used will.

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4 «amines, alkaline compounds.

According to the invention, compounds of the general formula can be used as amines with which the stabilization takes place

E ₂

can be used in which R, R. and Rp for a hydrogen atom or a lower alkyl group, such as Z ₀ B. -a methyl, ethyl, propyl, isopropyl, n-butyl group, etc. stand. the

in stabilization can also be done by / the light »· Sensitive recording material incorporates a neutral compound, which by heating after which provides the image Exposure to ammonia or an amine provides} such a compound can also be applied in a separate layer applied over the photosensitive layer.

5 «conditions.

The relative ratios of activator to leuco base depend to a certain extent on the particular materials. In general, it appeared to be about 8 parts to 1 part of acid or anhydride Leucobase to deliver optimal activation (image intensification). About 4 to 24 parts by weight of activator per part by weight. Leucobase represent a suitable working area for exposure times between 2 to 30 seconds with visible radiation represent.

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The following examples illustrate the present invention without limiting it.

Example 1 :

The following photosensitive preparation was made:

(a) Leuco Opal Blue. 0.5 g

(b) 2,4-dichlorophenoxyacetic acid 0.4 g

(c) 10 follow solution of polystyrene in benzene 10.0 ecm

(d) acetone 5 »0 com

The compounds (a) and (b) were dissolved in a mixture of (c) and (d) and the solution with a Bird applicator roller 0.031 mm wet thickness on a sheet of 500-D Mylar (terephthalate polyester) that does not have an adhesive layer was provided, upset. The coating was air dried for at least 15 minutes.

The coated Mylar sheet was under a negative in a usual printing frame with three General Electric sun lamps at a distance of 30 cm from the bottom of the lamp to the glass exposed in the print frame. A fan was used to cool the glass in the print frame.

The above exposure under a EASIÄN-step tablet ( "step table ¹¹⁾ for the period of 5 minutes yielded a maximum density of 1.3 at 10 levels" After the exposure was a

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clearly blue image visible in the "exposed areas, while the unexposed areas remained clear.

The copy was stabilized by using the following mixture:

28 fo Ammoniuiiiliydroxyd, 200 ecm

Acetone '100 ecm

The copy was attached to a glass plate, which was in a Distance of about 3.8 cm above a container of the stabilizing solution. So the copy became 15 minutes kept in the vapors that cause the sensitizing acid

component deactivated and at the same time bleached the image. 3 "to 5 minutes after removal from the alkaline vapor the color of the picture received its full maximum density in the now stabilized copy back.

A second way to stabilize was that the copy was immersed for 60 seconds in a stabilizing solution of ammonium hydroxide and acetone, washed with water and patted dry. Any slight red coloration that was present could be removed by a brief heat treatment at 100 ° removed in a convection oven.

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■ Example 2:

According to Example 1, photosensitive coatings were produced and exposed. After exposure, the image was stabilized _f . by exposing it to the vapor of the following amines for 3 minutes:

.CH-NH ₂
(CH ₃ ) ₂ NH

A'thylamine, methylamine and dimethylamine became a satisfactory one Stabilization achieved. Diethyl araine was a little less effective.

Example 3?

According to Example 1, using Leuco Crystal Violet made instead of Leuco Opal Blue coatings, similarly exposed and the exposed recording material

fixed by keeping 15 LIi nuts over ammonia vapor became. Renewed exposure of the fixed coating to a sun lamp for a period of 60 minutes only provided a trace of haze, indicating a satisfactory stabilization »

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Example 4 t

According to Example 1, using Leuco Methyl Violet instead of Leuco Opal Blue coatings were produced and exposed. The exposed coatings were stabilized with "a mixture of NH ₄ OH and acetone according to the second method according to Example 1. The fixed material was stable to renewed exposure to a sun lamp for 60 seconds.

Example 5 t

A coating mixture was prepared according to Example 1, except that 1.0 g of urea was added to the mixture and used as Solvent amount of acetone used was increased to 15 ecm. The mixture applied to Mylar and exposed in the usual way showed none due to the presence of urea Loss of sensitivity. After exposure, the film was decomposed to release ammonia in the coating of the urea heated to 150 ° for 3 minutes and thus stabilized. A, satisfactory stabilization was made indicated by only a slight haze after another 60 seconds exposure to the sun lamp formed. - -

Example 6;

Strips coated according to Example 1 were placed under a Line negative exposed for 5 minutes using the second method

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stabilized by Example 1 and in the. Production of diazo prints used as a sample copy. By exposure to three General Electric sun lamps for 20 seconds at a distance of 30 cm and subsequent evolution of ammonia, good diazo prints were obtained. Are part of the sample copy was again exposed to three sun lamps for 60 minutes, whereby a noticeable background haze formed. from however, this hazy copy could produce a satisfactory diazo print with only 30 seconds of exposure be made. This renewed 60 minute exposure would correspond to the production of at least 120 diazo prints.

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Claims (2)

Claims. .1. Process for fixing an imagewise exposed recording material from a) a leuco compound of a triphenylmethane dye, b) an organic acid anhydride, a halogen-substituted acetic acid or a halogen-substituted phenoxyacetic acid as a sensitizer, c) one on heating ammonia or an organic amine separating compound, d) optionally a binder and e) optionally a layer support, characterized in that that the recording material is heated. 2. Process for fixing an imagewise exposed recording material from a) a 1> over-bond of an iriphenyltnethan dyestuff, b) an organic acid anhydride, a halogen-substituted acetic acid or a halogen-substituted one Phenoxyacetic acid as a sensitizer, c) optionally a "binder" and d) optionally a layer support, characterized in that the recording material is treated with ammonia, an organic amine, is preferably brought into contact with an alkylamine or an alkaline solution » The patent attorney; 009808/138 7