FI64720C - DETERMINATION OF DIAZOTYPPAPPER WITH DIFFICULTY - Google Patents

Description

: ADVERTISING PUBLICATION, ® * 11 * UTLÄGGN1NGSSKRIFT 6 4 720 c (45) p "lr: r;,;, i: v-; L'y 1213: ~ 3 ^ ^ ^ (51) Kv.lk. ^ Int.CI . ^ G OJ G 1 / ^ 2 FINLAND —FINLAND (21) Patenttihtitemu * - PttentansBItnlng? 6θ612 (22) H »V» mi * pSlvi - AniBknlngtdag 10.03.76 (23) AtkupUvi - Glltlghetsdag 10.03.7 6

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Patent and Registration Office .... .......... , . .. „.

* (44) N Date of swimming and moonshine. -

Patent- och registerstyreisen Ansökan utlagd och utl.skriften publkerad 31.0o. o3 (32) (33) (31) Claim claimed privilege — Begird prlorltet (71) Tsentralny Nauchno-Issledovatelsky Institut Bumagi, Ulitsa Lenina 15/1, Poselok Pravdinsky Moskovskoi oblast, USSR (SU) (T2) Galina Iosifovna Ravzhaeva, Pushkino Moskovskoi ,

Lidia Andreevna Polischuk, Poselok Pravdinsky Moskovskoi oblast,

Gennady Borisovich Shtreis, Poselok Pravdinsky Moskovskoi oblast,

Vladimir Ilich Dudarev, Moscow,

Ljubov Petrovna Ilyukhina, Poselok Pravdinsky Moskovskoi oblast, USSR (S’J) (TM Oy Kolster Ab (5M Photosensitive composition and diazotypic paper using it -

Ljuskänslig sammansättning och diazotyppapper som använder densamma

The invention relates to the production of paper and in particular to a photosensitive composition used for the production of diazotypic paper. Such paper is used to obtain positive, black-stained line copies when reproducing technical documents from transparent originals.

Various photosensitive compositions are widely used to make papers coated with them to obtain copies of black colored lines.

These compositions comprise aqueous solutions that contain diazo compounds, such as diazotized dietyylianiiiineja, oksietyylianiliineja, tert-nyylimorfoliineja, atsoaineosia as fluoroglusiinia, acetoacetanilide, re-sorsinolia, monometyyliresorsinolia, naftolisulfonihappoja, chemical additives are given properties of the adoption of diatsotyyppisille papers such as citric acid, zinc chloride, dextrin, thiourea , glycerin and the like.

The following photosensitive compositions have been studied (in weight percent): 2,64720 1. Known from Uetski, MI Technical paper for copying documents, Moscow 19 ^ 3 U-diazo-N-ethyl-N, γ2-oxyethylaniline 1.77 fluoroglycine 0.13 ratium -2,3-dioxinaphthalene-6-sulfonate 0.682 acetoacetanilide 0.178 thiourea citric acid 4.0 zinc chloride 6.0 cysteine 1.2 glycerin U, 0 water to 100% 2. Known from DE patent 1,161 ^ 30 4-diazo-K, K-diethylaniline 2.0 sodium 2,3-dioxinaphthalene-6-sulfonate 1,5-acetoacetanilide 0.15

resorcinol 0, U

thiourea 5.0 s ferric acid 6.0 zinc chloride 3.0 magnesium chloride 3.0 phenylphosphinic acid 1,0 ethyl alcohol 3.0 isopropyl alcohol 1.0 saponin 0.1 water until 100%

The general disadvantage of both of the above compositions is due to the short shelf life (up to 3 months) for papers made from these compositions.

Another serious drawback of the above compositions is caused by the instability of the dominant wavelength of the azo dye in the sensitogram; as the exposure time of the paper increases using a UV light source, the color tone of the image changes to amber when using originals with increased line transparency, such as using pencil lines.

The object of the invention is to eliminate the above-mentioned drawbacks.

In accordance with the foregoing, the invention comprises formulating the ingredients so as to extend the shelf life of the diazotypic paper and to ensure that the color tone of the images is maintained.

3,64720

The above object relates to the formation of a photosensitive composition for the production of diazotypic paper containing a diazonium salt, an azo component, thionrea, citric acid, zinc chloride and water, the composition of which according to the invention is as follows by weight: 4-diazo-N, N-diethylaniline 2.3 sodium 2,3-dioxinaphthalene-6-sulfonate 0.69 ~ 1.32 monomethylresorcinol 0.3h to 0.73 citric acid 3.0 to 6.0 thiourea U, 0 to 6.0 zinc chloride 2.0 to U, 0 dextrin 1.0 - U, 0.0 Gly:., Erine 1.5 - 3.0 water remaining

If desired, the composition may contain a colorant such as methylene blue to tint the background of the copy in an amount of 0.002 to 0.01% by weight.

According to the invention, a diazotypic paper is obtained which consists of a substrate of paper coated with a layer of the above-mentioned composition.

The invention allows the shelf life of diazotypic paper to be extended due to the use of a combination of L-diazo-N, N-diethylaniline, monothnethylresorcinol and sodium 2,3-dioxynaphthalene-6-sulfonate and due to the chosen composition of the whole composition.

A valuable advantage of the composition in the production of diazotypic paper according to the invention is based on the constant, dominant wavelength of the azo dye in its itogram. This is due to · sodium 2,3-dioxinaphthalene-6-sulfonate and monomothylrosorcinol. the identical reactivity of the azo combination with U-diazo-N, N-diethylaniline, which in turn allows the area of the originals to be enlarged for reproduction and in particular to obtain normal-toned copies of the halftone images.

In addition, the composition of the invention is easier to prepare. This is due to the smaller number of ingredients used, the choice of only one crystalline azo compound (sodium 2,3-dioxinaphthalene-6-sulfonate) and the use of the liquid ingredient (monothnethylresorcinol) as the yellow ingredient.

The invention achieves an increase in the residual rate when using diazotypic paper in copying machines.

The composition is prepared by mixing the above ingredients together. The composition is applied to a paper substrate using a known known procedure in a 64720 coating apparatus, for example using embedded rolls. Excess solution is removed with air or a glass knife. The paper coated with the composition was dried in an oven at a temperature of up to 150 ° C. The finished paper is wrapped in rolls in black polyethylene film or opaque paper.

The copy is made by contacting the paper with the original, exposing it with UV light, and developing with ammonia vapor. This produces copies with black lines on a pure white background.

To improve the contrast of the diazotypic paper, the paper may be coated with an adsorbent composition, for example an aqueous solution of silica and a binder such as polyvinyl alcohols, before applying the composition of the invention.

The superiority of the composition according to the invention can be demonstrated by the following comparative experiments:

Comparative tests:

The following compositions were prepared:

Mixture A containing p-diazo-N, N-diethylaniline and sodium 2,3-dioxinaphthalene-6-sulfonate,

Mixture B containing p-diazo-N, N-diethylaniline and resorcinol monomethylate

Mixture A + B containing all three of the above components (composition of the present invention).

The amounts of these components and other substances included in the compositions are shown in Table 1.

Table 1 Amount, g

Compound Mixture A Mixture B Mixture A + B

___________ (according to the invention) dextrin 2.0 2.0 2.0 thiourea 5.0 5.0 5.0 citric acid 1.0 1.0 1.0 zinc chloride 3.0 3.0 3.0 glycerol 2.0 2 .0 2.0 p-diazo-N, N-diethylaniline 1.92 1.92 1.92 sodium 2'-S-dioxinaphthalene o-sulfonate 0.99 - 0.99 resorcinol monomethylate - 0.38 0.38 methylene is in in en 0.0025 0.0025 0.0025

II

64720

In addition, a known composition (mixture C) was prepared from Uetski, MI, a technical paper for copying documents, Moscow 1973 (composition 1 shown on pages 1 and 2 of the present application) and a composition known from Example 2 of NO patent publication '03 7-k (mixture D ).

The results of the comparative experiments are shown in Table 2.

Table 2

Mixture

Characteristics A B A + B C D

Photocopy speed, m / min 2.0 2.0 2.0 1.2 2.0

Resolution, lines / mm 11 11 11 Ή 11

Optical density (D) of the image 1.13 0.55 1.16 1.07 1.10

Background whiteness,% 65.0 65.0 67.9 6U, 6 65.6

Contrast 1, 0UU 0, U7 1, 07 0.92 1.102

Contrast reduction after 6 months from% K 7.2 6.8 5.0 9.35 7.0

Reduction of background whiteness after 6 months of storage% W ^ 8.5 7.7 5.7 19.7 10.6

It appears from the table that the components used in accordance with the present invention provide a synergistic effect.

The invention can be better understood by means of the following examples, which illustrate some of its implementations.

Example 1 1.2 g of dextrin was dissolved in 50 ml of water at 80 ° C. Then 0.62 g of sodium 2,3-dioxinaphthalene-6-sulfonate, U g of thiourea, 3.2 g of citric acid, 2.5 g of zinc chloride, U.0 g of glycerol and 0.3 * + g of monomethylresorcinol were added with stirring (solution I). 1.53 g of * + - diazo-N, N-diethylaniline was dissolved in 30 ml of water at 30 ° C (solution II). Solutions I and II were combined and water was added to a volume of 100 ml. The resulting composition was applied to a paper support, and the resulting diazotypic paper was dried. The shelf life of the paper was 5 months. The paper was exposed to ‘JV light’ through an original made with ink on translucent paper and a copy was developed with ammonia vapor. A positive copy was obtained with black lines on a pure white background.

6,64720

Example 2

The following composition was prepared in grams as described in Example 1: dextrin 1,7 sodium 2,3-dioxinaphthalene-6-sulfonate 0.9 ^ thiourea 6 citric acid 4

zinc chloride U

monomethylresorcinol 0.53 glycerol 2,5-diazc-N, N-diethylaniline 2,3 methylene blue 0.0025 water until 100 ml

The above composition was applied to a paper support, the resulting diazo-type paper was dried, exposed to UV light through an original made with a pencil on translucent paper, and developed with ammonia vapor. A copy of the black lines on a pure white background was obtained.

Example 3

The paper substrate was coated with an adsorbent layer containing silica and polyvinyl alcohol, dried and then coated with the following photosensitive composition (in grams): dextrin 1.2 sodium 2,3-dioxinaphthalene-6-sulfonate 0.8 citric acid 5 citric urea 5 citric urea .0 monomethylresorcinol 0.0 glycerin 2,3 U-diazo-N, N-diethylaniline 1.9 water until 100 ml

The paper coated with the photosensitive layer was dried, exposed to UV light through the original and developed with ammonia vapor.

A high-contrast copy was obtained consisting of black lines on a pure white background.