DE1045799B - Process for the production of diazotype material - Google Patents

Description

GERMAN

The invention relates to a method of making diazotype material of the type in which a base made of paper, canvas, foil or any other fibrous, woven or plastic material wettable base material in sheet or film form a coating of a photosensitive layer for the diazotype process.

Due to the nature of most carriers for photosensitive layers as commonly used it is difficult to obtain a surface which prevents the applied sensitizing substance penetrates unevenly into the base material, and in some cases even penetrates it straight through. Such a sinking in or penetration results in a poor contrast effect when pauses or prints are made from such material, discolored backgrounds, fluctuating sensitivity and other defects.

It is known that supports can be made with a special layer that prevents penetration the sensitizing solution prevents it from being put on. For example, it is known that the .Small carrier with substances such. B. gelatin or can also be coated with cellulose or polyvinyl acetate, which then prevents the penetration of the sensitizing compound prevent into the carrier. If now also bases made of gelatine or cellulose resp. Polyvinyl acetate have been used with success in many respects in practice, so · are satisfactory however, because of their natural properties, these substances are not entirely, from all points of view considered.

For example, gelatine and cellulose or polyvinyl acetate are used as substrates for photosensitive Compounds of the diazotype are used, then highly viscous solutions must be applied, which are difficult to handle; because they tend to stick or assemble and do not adhere easily on non-porous surfaces, and as far as gelatine is concerned, it tends to be strong in a moist environment for swelling and sticking when exposed to water vapors and, as a result, cannot be used as a act as a solid binder for the applied sensitizing compound.

It has also already been proposed to use glassy paper as the layer support in the production of diazotype material and to reinforce the same by adding an organic film-forming material, which is transparent in a thin layer, as a solidifying agent to the sensitizing mixture to be applied, or in the organic Dissolves solvent which will serve as the liquid medium for the sensitization mixture. The basic principle of the method of the invention for production
of diazotype material

Applicant:
Ozalid Company Limited, London

Representative: Dr. M. Eule, patent attorney,
Munich 13, Kurfürstenplatz 2

Claimed priority:
Great Britain 9 February 1955

Eric Parry, Barkingside, Essex,
and Humphrey Desmond Murray, London

(Great Britain),
have been named as inventors

rens is over against the above that in the context of the production of photosensitive material for the diazotype by applying a sensitizing mixture containing a photosensitive diazonium compound on one with a layer of a polymeric, acidic groups-bearing Substance-coated base is worked in such a way that the polymeric groups are acidic Character-bearing layer is made to swell by the action of a swelling agent and the Sensitization mixture is applied while the polymer layer is in a swollen state is located. After drying, it forms a practically insoluble binder for the photosensitive Fabrics.

Compared to gelatine and others so far as substrates for light-sensitive diazo compounds substances used come one or more certain desirable properties in increased Measure the polymeric groups of acidic character containing substances, as they are according to the present Invention can be used. The substances used with preference are, in particular, copolymers made of styrene and maleic acid as well as copolymers made of polyvinyl chloride, polyvinyl acetate and maleic acid, as well as bleached, dewaxed shellac. The above-mentioned properties, which for the substances to be used are desired in order to make the carrier substance resistant to

809 697/437

3 4

to make the penetration of the sensiKsier wet, zen, the drying of the polymer layer, the surface: the ability to form solutions that depress a sensitizing solution or suspension low viscosity, which are good film formers and this layer, e.g. a light-sensitive diazonium have good adhesion, even with pore connection in a solvent mixture, whereby

Loose surfaces with no tendency to flocculate, this solution or suspension also acts as a swelling agent high melting points and solubility in different acts for the polymer layer, as well as the those solvents, the ability to retain the coated ouelling state in further or repeated drying the sensitization mix to a carrier.

absorb, then a good, after drying If desired, the sensitizer can be practical Insoluble binding agent for the sensitiser solution or suspension, also coupling component release, and finally contain permeability for th and stabilizers, and instead of ammonia, subsequent to the application of the polymeric substrate, the swellable substance forming the backing layer can be applied, the sensitizer Punch can be applied to the carrier in any suitable manner, including the solution or suspension of the polymeric substances In the manner applied, added to the punch and together with the same on the for example, be applied in the form of a solution or a sus pad.

pension, either before the sensitization. A copolymer of styrene and maleic solution or suspension, or you can already use acid, then z. B. that under the designation or all components of the said sensitization »LUSTREX X 820« (registered product identification solution or suspension included. Usually 20 characters) known particularly suitable; for this is the sensitizing solution or suspension, on the copolymer isopropyl alcohol 1 is the most suitable beforehand with a layer of the polymeric sub-solvents.

punch coated. Carrier applied. When drying, the solvents become layered together is then placed in the swelling state with the swelling agent, if such is incorporated and absorbs the sensitizing solution or -sus-25 was removed, the dried layer becomes for oils pension. The swelling has the effect of making it and water insoluble and acts as a tight bandage penetration the sensitizing compound in the layer for the diazonium compound and others provided that said sensitizing solution or components contained in said layer -suspension are th according to the known coating process.

is applied. 30 It was found that according to the present case if desired, the layer of polymeric materials made of the invention can be a besse substance even before the solution or the contrast and a clearer background are applied to the suspension of the light-sensitive: diazonium compounds; they have better resilience dung can be pretreated with swelling agents, or against fading and are practical both but the mentioned solution or suspension can itself be water- and oil-resistant. It also gives the acidic act as such a swelling agent or else contain the same character as the polymeric sub-bases forming the base. The desired effect of the source becomes in the same way an increased affinity for ammo-general achieved by means of a solvent for niac and other alkalis, whereby the same aufgedie polymeric substance, the effect of which is inferred, and this in turn results in a the presence of a medium is modified that improves development.

no dissolving effect on the polymeric substance This latter characteristic is particularly effective so z. B. water, since the effect of the solution interpretation, since in the subsequent drying the means by itself after drying a smooth top ammonia evaporates and a solid, hard surface would leave area without a swelling effect.

would have taken place. As the solvent, an Al-45 can be used. The following is a description which is merely

alcohol can be chosen, e.g. B. isopropanol, or Ke- as an example of the method for carrying out the

tone, such as B. acetone, methyl-ethyl-ketone or Me- the present invention is to serve.

sityloxyd. .

Example!

(CH ₃ ) ₂ C: CH · CO · CH ₃ ...... _T ... . . . ",

50 A solution from the following components is

and esters such as B. ethyl acetate. The above mentioned parts made:

So swelling agent is generally one or more »LUSTREX X 820«. Styrene maiein

such solvent in an aqueous medium acid copolymer 750 g

contain, be it as a pre-treatment swelling agent isopropyl alcohol 3500 cm ³

before applying the sensitizing mixture ₅₅ carbon tetrachloride (as a thinner

is used or whether it is contained in this medium itself) 1500 cm ³

is or whether both are the case. In the. Cases where the dibutyl phthalate (as a plasticizer) 75 cm ³

Ouellmittel is contained in the sensitizing mixture, ..,

the solvent component for the poly- The solution is filtered cold on a pad

merisat also used as a solubilizing or digestion _fi and dried the liquid layer _

Serve means for the Diazoniumverbindüng. ° It is then prepared with one of the following

The polymeric substance can be ^{treated with the base substance} sensitizing solution for the diazotype,

or the carrier substance as a solution in alcohols, 4-diazo-l-diethylamino-benzene (fluobo-

Ketones or esters are applied; if advised) 900 g

if desired, suitable plasticizers can be added. 65 Resorcinol 600 g

set. Isopropyl alcohol 2000 cm ³

A method of carrying out the present mesityloxyd [(CH ₃ ) ₂ C: CH • CO • CH ₃ ] 1000 cm ³

Invention comprises the operations of enrobing citric acid 300 g

a carrier with a solution or suspension thiourea 100 g

any of the above-mentioned specific substances 70 water. 1500 cm ³

Claims (1)

5 6 Then it is dried again. That consists in this way, wherein the polymeric substance preferably prepared photosensitive material can then be in the form of a suspension or in solution, e.g. B. in light and developed according to the usual procedures alcohols, ketones or esters, if necessary to be. together with plasticizers, is applied to the carrier on the basis of η ie 1 II 5, characterized in that the polymeric substance is produced in swollen parts by the action of a swelling agent: Condition compared with the sensitization mixture. Carbon tetrachloride (as a dilution mixture is dried. Medium ") 1500 cm3. Method according to claim 1, characterized in that castor oil (as plasticizer)". '.'. '.'. ". ' '.'. [150 g shows that the polymeric substance is preferably a styrene-maleic acid mixture polymer, emPoly- The solution is filtered, applied cold to a base of vinyl chloride-polyvinyl acetate-maleic acid mixture and the liquid layer is dried, polymer or bleached , dewaxed It is then used with a shellac as described below and treated with a mixture of sensitizing solution for the diazotype of one or more solvents for the deli: polymeric substance and water or another. - .. Λj., ι ι · Κ ι 20 nonsolvent is brought to the source. 4-Diazo-l-dimethylamino-benzene ο-ϊτ-γΤ ι λ ~ ι ο, ι, 1 fZn-Sal) 70 ° / 900 CT method according to claim 2, characterized -D1 · ° ^ QQ% indicates that the swelling agent is a mixture of j.n .. 'OQQ ^ water and one or more solvents, namely alcohol, ketones, such as acetone, Me- 4. Process according to Claim 3, characterized in that it is wiede r dried. This shows that as a swelling agent a mixture of photosensitive material produced can be exposed to light, water and isopropyl alcohol is used, and developed according to the usual methods. 30 5. The method according to any one of claims 2 and 4, the achievable in the reproductions contrast, characterized in that the light-sensitive effect can be regulated by setting a solution or a suspension of the light of the proportion of water to the solvent in the mass the sensitive diazonium compound in a sol-sensitizing solution. chen solvent or mixture is used, it can be assumed to be known that, although which acts at the same time as a swelling agent for the poly- well the diazotype-sensitive substance in the above example and the total mixture of sierlösung subsequently to the solution of the polymeric the dry substance-covering layer is applied, the base - if polymeric substance is applied, is desired - can already contain some or all of the constituents. 40 shows that the solvent used in the swelling agent is one which is at the same time a solvent for the diazo compound. 7. The method according to any one of claims 1 to 4, 1. Process for the production of diazotype, characterized in that the layer which material, which is a carrier, furthermore a layer of +5 the acidic group-containing polymeric substance contains a polymer having acidic groups, with the swelling agent prior to application of the and finally a light-sensitive portion of the light-sensitive mass is treated. that consists of a light-sensitive diazo compound and, if applicable, one or more publications considered: Coupling Components and Stabilizers 5 ° USA. Patent No. 2,501,874. © «03 697/4 & 7 11.58