CS200433B1 - Transparent diazographic material for ammonia or liquid developing - Google Patents

Description

The present invention relates to a diazographic rematriation material and to a transparent paper backing provided with an opaque lacquered bilayer, a functional hydrophilic intermediate layer and a photosensitive diazographic opaque assembly for ammonia or liquid induction.

Opioid bilayer diazographic material is a rematriation material designed to make duplicates of the originals on an ultraviolet-transparent substrate, especially when the original is to be archived, or more copies than the original allows, or if intermediate copying is required to make corrections.

For exposure and development of this material so on unexposed areas, the active and passive components produce a light stable azo dye with high absorption in the ultraviolet range of the spectrum. This material can be processed on speoial machines for diazographic materials or copied in a uniformly illuminated ultraviolet light source by contacting the material either by ammonia vapor or by uniformly spreading the liquid developer onto the material (eg * cotton) ·

Direct application of opioid diazographic assemblies to a transparent paper backing is associated with a variety of problems, such as uneven settling on paper, uneven absorbency, dimensional instability, low mechanical strength and low resistivity when used with this material, low outline sharpness.

The above drawbacks do not have transparent diazographic material for ammonia or ka200 433

200 433 pallet development according to the invention, which consists of a transparent paper substrate, adapted for transmitting radiation in the ultraviolet spectrum, weighing from 0.02 to 0.2 kg per m, a functional layer of hydrophilic polymers based on 2 - hydroxyethyl methacrylate, diethylene glycol methacrylate, triethylene glycol methacrylate, N- (hydroxyalkyl) methacrylamide, polyvinyl alcohol and copolymers of these monomers with acrylic and methacrylic acid, N-alkyl substituted acrylic and methacrylate esters of alkyl or methacrylamide or alkyl esters and aliphatic blocked 1 unblocked disocyanates or bisepoxides with concentrations of 0.05 to 5 parts by weight, calculated on the weight of the dry polymer, and light sensitive diazographic assemblies, containing 0.3 to 4.5% of the diazo compound or a mixture of diazo compounds, based on single or substituted p-phenylenedlamine derivatives;

5.2% of the reddish coupling component, or mixtures thereof, derived from single or substituted azoeaeaetoneites, azoetobenzenamides, alpha or beta resorcylic acid derivatives, and kit toning components such as resorcinol or florogluoin or components, are capable of providing mixed neutral azo dyes containing single or substituted bota-oxnaphthanoic acid derivatives or amides thereof, as well as conventional diazographies.

The transparent diazographic material according to the invention is prepared by applying a 5 to 50% strength solution of hydrophilic polymers to a transparent paper using a conventional coating machine. The amount of hydrophilic polymer applied to the paper is 1 to 50 g dry matter per m @ 2. of paper · After this functional intermediate layer is dried, the diazographic assembly solution is applied to the functional intermediate layer and by conventional application of the device · The spindle is then dried ·

The hydrophilic interlayer is formed by applying preferably a 10 to 20 percent solution of hydrophilic polymer (in various solvents) containing crosslinking components which, after heating the coated paper to 90 to 150 · 0 for 30 sH to 10 min, causes the polymer to cross-link. spools on paper backing.

Solvents of the aforementioned hydrophilic polymers may be methyleeloselve, ethyleelosolve, glycerin, glycol, diglycol, THF, methanol, ethanol, dimethylformamide, dimethylsulfoxide and the like.

A 1 to 40% aqueous ammonium dichromate solution in an amount of 0.01 to 5 parts by weight relative to the polymer solution is used for additional crosslinking. It is also possible to use various aliphatic 1 aromatic free 1 blocked diisocyanates or bis-epoxides in an amount of 0.05 to 5 parts by weight relative to the dry polymer.

Polymer solutions obtained by free-radical polymerization of the respective monomer to maximum conversion can also be used directly for the glaze of the paper support.

The functional lacquer interlayer according to the invention substantially increases the dimensional stability, reduces the penetration of the diazographic opaque layer into the paper, and increases the contrast, resolution and contour sharpness after application of the photosensitive opaque composition.

The following are examples of preparing the hydrophilic interlayer without limiting the invention.

200 433

Example 1

Polymer solution of the prepared polymer is applied to the paper substrate by a conventional method! Headers 104 g 2-hydroxyethyl methacrylate in 600 g of methyloelosolvu initiated with 0.4 g of 2,3- azobie (isobutyronitrile) at 60 ⁰ βΓ for 14 hours and comprising 0.4 weight parts 20% aqueous solution of ammonium dichromate. Heating the paper substrate coated with a polymer layer ((10 g dry weight / r?) At 120 ⁰ C for 3 minutes before the solvent evaporates and crosslinking the polymer layer. The thus prepared substrate is then applied opaoitní diagogmafická own layer in conventional manner.

Example 2

A 15% solution of poly (2-hydroxyethyl methacrylate) prepared by polymerizing a 20% solution of 2-hydroxyethyl methacrylate in methanol at 60 ^° C in the presence of 0.4 parts by weight of 2,2'-azobia (isobutyronitrile) is applied to a paper substrate. for 16 hours, and precipitation of the polymer into a 20-fold excess (by volume) of ether and after suctioning off the precipitate by drying under vacuum in methyloelosol containing 0.4 parts by weight of a 15% aqueous ammonium dichromate solution. The hydrophilic layer is obtained in the same manner as in Example 1, the thickness of the hydrophilic layer

the layers are adjusted so that the dry polymer consumption is 5 g / m ·

Example 3

% Polymerization 15 wt. 2-hydroxyethylraethacrylate and methacrylic acid in a 7: 3 molar ratio in methyloelosolv in the presence of 0.8 parts by weight of diazopropyl percarbonate at 60 ^° C for 14 hours is prepared a hydrophilic polymer solution which is mixed with 0.7 parts by weight (dry) polymer) of blocked toluene diisocyanate. The solution thus prepared is applied to a paper substrate in an amount of 15 g dry polymer / m @ 2. washer, heat recovery at 140 ^° C for 5 minutes.

Example 4

The polymer solution was prepared by copolymerizing 20 parts by weight of 6-hydroxy-3-oxapentyl-methacrylate with butyl methacrylate (4: 1 molar ratio) in 80 parts by weight of ethylcellulose at 60 ^° C in the presence of 0.4% by weight of tert-butyl peroctoate. for 15 hours. The polymer solution thus prepared is admixed with 0.8 parts by weight of methylenebis (3,4-opoxycyclohexane), 0.2 parts by weight of maleic anhydride and 0.08 parts by weight of triethylenediamine, and is applied to a paper substrate in an amount of 5 g dry matter / m. ² . Curing was performed by heating at 150 C for ⁸ 3 minutes.

Diazographic sets are suitable, for example, kit A 1 50 ml distilled or demineralized water g citric acid

3.5 g Thiourea g Zinc chloride

1.5 g urea g aluminum sulphate

3.3 g betareseroylic acid alphahydrexiethylamide

0.7 g of S.S-dimethylresoroyl sulfonium chloride

1.3 g 2-Hydroxy-3-naphthoic acid 2-aminoethylamide g p- (N-morpholine) -benzenediazonium chloride .1 / 2 Per 10 ml make up to 100 ml with water and assembly ml ml distilled or demineralised water

2.4 g tartaric acid

0.6 g barium acid g thiourea

0.5 g aluminum sulphate

0.5 g of zinc chloride

4.4 g make up to 100 ml with 3-chloro-4- (7, N-diethylphthymine) -benzenedlazonium chloride.

The diazographic assembly of Example A is suitable for glazing on the interlayer of hydrophilic polymers of Examples 1 to 4 for ammonia-inducing material.

The diazographic assembly of Example B is suitable for deposition on a functional intermediate layer of hydrophilic polymers of Examples 1-4 for liquid developing materials by a suitable diazegraphy developer.

Instead of the substances used in the diazographic assembly according to Examples A and B, for example, oxalic acid, itaconeveic acid, caffeine, oat chloride, simple or substituted p-phenylenediamine derivatives, simple or substituted oetoaoeanilides, acetobenzamides, alpha, beta resoroyle, florogluoin, simple or substituted beta.oxinaftoevic acid derivatives or amides thereof,

Claims (1)

SUBJECT OF THE INVENTION Transparent diazegraphic material for ammonia or liquid evolution, characterized in that it consists of a transparent paper substrate, adapted for transmitting radiation in the ultraviolet spectrum, weighing 0,02 to 0,2 kg per m, of a functional interlayer consisting of hydrophilic polymers based on 2-hydroxyethyl methacrylate, diethylene glycol methacrylate, triethylene glycol methacrylate, N- (hydroxyalkyl) methyl acrylamides, polyvinyl alcohol and copolymers of these monomers with acrylic acid and methacrylic acid, with N-alkyl substituted acrylic and methacrylic acid esters or with alkyl or methacrylamide esters or ammonium dichromate solution, aromatic and aliphatic blocked and non-blocked diisocyanates, or bis-epoxyde, and light-sensitive diazegraphic assembliesip containing 0,3 to 4,5% diazo compound or a mixture of diazo compounds based on simple or substituted substituted d p-phenylenediamine erivate and 0.5 to 5.2% of the color-forming coupling component or mixtures thereof, derived from simple or substituted α-oetoeaethanides, α-oetoben-amides, alpha or beta resercylic acid derivatives and kit-tinting components such as reseroin or floregluoin, or components capable of providing a mixed neutral azebar containing simple or substituted beta-oxinaphthenic acid derivatives or its amides, as well as conventional excipients in diazcgraphy.