SU319277A1 - Method for increasing photosensitivity of panchromatic negative photosensitive materials sensitized with 4,5,4,5 dibenzothiocarbocyanine - Google Patents

Description

(54) METHOD OF INCREASING THE LIGHT-SENSITIVITY OF PANCHROMATIC NEGATIVE CINEMA PHOTOMATIALS, SENSIBILIZED 4,5,4,5, 5-DIBENOTOTIARARBOPIANINES

There is a method of increasing the sensitizing effect of optical sensitizers by introducing into the emulsion various derivatives of nitrogenous heterocyclic bases. However, such compounds have an activating effect only on some groups of dyes, mainly on 2.2 - quinocyanines.

It is also known to use super-sensitizing mixtures of dyes containing 4,5,4, 5 - dibenzothiocarbocyanines. However, the observed effect of increasing sensitivity is very small and largely depends on the nature of the emulsion.

A method is proposed for increasing the photosensitivity of panchromatic negative kinofotomaterialv sensitized with 4,5, 4, 5 - dibenzothiocarbocyanines of the general forum.

SIf

bJ-CH C-CH,

R is alkyl and X is an acid residue, introduced into the emulsion before, after or simultaneously with the sensitizer oi-or / L-acylaminonaphthalene sulfo-or disulfoxy 5 lots of the general formula

NHCOU

50mme B

0

where B is a hydrogen atom or SO NottK),

R is an aliphatic residue with the number of carbon atoms not less than 11, in the form of aqueous solutions and their salts with alkali metals.

The introduction of these compounds into the emulsion causes a significant increase in the total and additional photosensitivity of film photographs.

0

The photosensitivity increases with the introduction of 0.1 to 5 g of these activators per liter of sensitized emulsion.

layers, especially to the yellow and red parts of the spectrum, in a number of cases surpasses that obtained using the most effective panchromatic sensitizers.

Thus, the application of the described method makes it possible to obtain highly sensitive panchromatic film photographic materials with a sensitization zone of up to 72 O nm, including the maximum sensitivity which lies at 660 668 O nm. Example 1, K1l of a molten negative ammonia-bromo-silver-emulsion emulsion (for example, type 1O) added 200 ml of O, 75% aqueous solution of disodium salt of 2-stearoylamino-naphthalene-5.7-disulfonic acid, and then added 5O or 75 ml of 0.04% Alcoholic solution of 3,3, 9 - triethyl - 4,5, 4, 5 - dibenzothiocarbocyanine bromide. After melting the sensitized emulsion in a thermostat at 37 ° C for 20–40 min, it is poured onto plates or film. The photosensitivity, determined by yellow and red light filters, of the photographic material thus obtained is 23 times higher than that achieved in the absence of the indicated acylaminonaphthalene disulfonic acid with an optimum amount of sensitizer, and 25-30% higher than when using the most effective panchromatic dyes used. The overall photosensitivity increases with more than 5%. When using 2-stearoylaminonaphthalen-3, 7-or-6.8-disulfonic acid, the sensitivity of the emulsion (after the red filter) sensitized by the same dye is increased by a factor of 2.5 and 1.5, respectively. Example 2. Analogously to Example 1, 20, 50, 100 or 200 ml of a 1.5% aqueous solution of dipotassium salt of 1-lauroyl- or 1-palmitoylamino-naphthalene-4.8-disulphonic acid and 50 or 75 are simultaneously administered in a 1 l emulsion. ml of 0.04% alcohol solution of the same sensitizer. After 20-30 minutes, the emulsion is watered onto a film or plates. The resulting photographic material has a much greater additional sensitivity (1.5 times for yellow and 2.5 times for red filters) as compared to that achieved in the absence of the indicated activators. The overall photosensitivity of the emulsion increases 1.5 times.

Claims (1)

mitoylaminonaphthalene-7 - sulfonic acids and 50 or 75 ml of a 0.04% alcoholic solution of the same sensitizer. After standing, the emulsion is poured onto a film or plates. The photosensitivity of this photographic material, determined by the red filter, is 1.5 times higher than that obtained in the absence of the indicated acylaminonaphthalene sulfonic acid. Increasing the overall sensitivity and for the yellow filter in this case is insignificant. Example 4. Analogously to example 1, the additional photosensitivity is increased by 50% with the introduction of 1 l emulsion sensitized with 20 mg 3, g diethyl 4.5 4, 5 dibenzothiocarbocyanine chloride, 2.5 g disodium salt of 2-stearc) ilaminonaphthalene-5 , 7 - disulfonic acid or 2-lauroyl-aminonaphthalene-4,8 - disulfonic acid. Example 5. Analogously to Example 1, 50-20 O ml of a 1.5% aqueous solution of 1-stearoylamino-naphthalen-4, 8-or-4.7-disulfonic acid and 5 O-75 ml O, O4% alcohol are introduced into 1 l of the emulsion solution of 3,3 - dimethyl - 4,5, 4, 5 - dibenZO-9-ethylthiacarbodianine chloride. The photographs obtained have a significantly greater both additional (22, 5 times) and total (1.5-2 times) photosensitivity compared to what was achieved in the absence of applied activators. A p and me 6. A similar increase in total and additional photosensitivity is achieved with the introduction in 1 l of an emulsion sensitized with 2 O-30 mg of the same dye, 0.5-2.5 g of 2-palmitoylaminonaphthalene disodium salt - 5.7 - or 4, 7- disulfonic acids. The invention of the method of enhancing photosensitivity, especially to the red and yellow parts of the spectrum, of panchromatic negative cinema photographs sensitized to 4.5, 4, 5 - dibenzothiacarbocyanines of the general formula with a biliser of sulfo or 56 ° C - or p-acylaminonaphthalene - where B is a hydrogen atom or ); disulfonic acids of the general formula1 aliphatic residue with the number of yrv I NHCOR carbon atoms not less than 11, in the form of water S Oj Puffs of their salts with alkali metal polyamide. 319277