JPS5962851A - Developer for diazo copying - Google Patents

Abstract

PURPOSE:To obtain developed color images of constant and high density at all times by using a nonpolar org. medium which dissolves a specified org. amine and does not dissolve the components of a photosensitive layer and a produced dye. CONSTITUTION:Org. amine to be used is selected from all of org. amines which are soluble in a nonpolar solvent, have >=150 deg.C, preferably >=170 deg.C b.p., and are liq. at ordinary temp. Silicone oil is used as the nonpolar solvent for dissolving the specified org. amine. Silicone oil is a colorless, nonpolar and oily matter with superior heat and chemical resistances made of straight chain dimethylpolysiloxane. The b.p. and viscosity of silicone oil depend on the mol. wt. The preferred b.p. is >=150 deg.C. The viscosity is not especially restricted, yet silicone oil with excessively high viscosity is not preferably used as the solvent of a developer for diazo copying when spreadability on diazo sensitive paper, permeability and the extent of sticking are taken into consideration.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a diazo copying developer using an amine.

The developer used for wet or semi-dry diazo copying is usually one in which organic amines such as monoethanolamine, jetanolamine, and dodecylamine are dissolved in solvents such as alcohols, esters, ethers, ketones, and amides.
For example, Japanese Patent Publication No. 46-41878 (Japanese Patent Publication No. 46-41878), a mixed yarn consisting of light oil, lower alcohol, and its acetate ester as a solvent (Japanese Patent Publication No. 48 -16842 Publication), a mixed system consisting of methylphenyl silicone, polyhydric alcohol and glycol ether (4'4+, Publication No. 51-
14025 Publication), or an organosilicon compound having a basic nitrogen atom as a solvent, and water, alcohol, ether, ketone, ester, amide, or sulfoxide, taking into consideration the discoloration μhlF of the background part θ). A system using a mixed system (Japanese Unexamined Patent Publication No. 52-4828) is known. However, polar solvents such as alcohols, esters, ethers, ketones, and amides, and water dissolve the diazo compounds, couplers, acid stabilizers, etc. that are the components of the photosensitive layer of diazo photosensitive paper, and the dyes that are the 1JII image components formed on the photosensitive layer. Because it is easy to clean, development r containing 46-based bath medium such as θ);
When used for a long time, 1) the amine, which is the base component therein, is neutralized and becomes
As a result of the reduced heat resistance, the resulting image will lack color development; 2) Since the polar solvent is hygroscopic, the composition of the printing agent cLt is likely to change in dilution depending on the environmental humidity, and as a result, the color development of the image will not be constant; 3) ) The developer is contaminated by the eluted dye, and therefore the background of the printed copy is also contaminated, and the dye image tends to fade due to the polar solvent remaining in the support even after rifling.

The first object of the present invention is to dissolve certain organic amines, but
By using a non-polar organic medium that does not dissolve the components of the photosensitive layer or the dye produced, diazo produces consistently high-density colored images without causing discoloration or contamination of the developer or copy background, as well as fading of the dye image. An object of the present invention is to provide a developer for copying.

A second object of the present invention is to provide a stable diazo copying developer that is not affected by environmental temperature or moisture or forgeries.

That is, the developer of the present invention is prepared by dissolving a liquid organic amine having a boiling point of 150° C. or higher in silicone oil.

Any organic amine used in the present invention can be used as long as it dissolves in a nonpolar solvent and is liquid at room temperature with a boiling point of 150° C. or higher, preferably 170° C. or higher. If the boiling point is below 150°C, it will evaporate and change the composition of the developer, and if you use a developer that is solid at room temperature, it will easily precipitate in the solvent.
It can no longer be used as an agent. It should be noted that organic amines such as alcohol amines that have been conventionally used are mostly insoluble in non-polar solvents, so they can hardly be used in the present invention.

Examples of the organic amines having the above properties used in the present invention include n-heditylamine (boiling point 158.3°C), n-octylamine (boiling point 188°C), n-decylamine (boiling point 217°C), and 2-ethylhexyl. Amine (boiling point 169
°C), methyliminobispropylamine (boiling point 234 °C)
), dipropylene triamine (boiling point 240°C), diethylaminopropylamine (boiling point 169°C), dibutylaminopropylamine (boiling point 238°C), N-(aminopropyl)morpholine (boiling point 21s-230°C), N-(
Aminozolovir)-2-picohelin (boiling point 22+1℃)
, N-aminoethylpiperidine (boiling point 182°C), N-
Aminoethylmorpholine (boiling point 200°C), “+”-bisaminomethylcyclohexane (boiling point 10 at 7wHg)
8°C), diethylenetriamine (boiling point 206, 7°C),
Triethylenetetramine (boiling point 277°C), tetraethylenepentamine (boiling point 340°C), hentaethylenehexamine (50ttanHg teno boiling point 260°C), dicyclohexylamine (boiling point 256°C), dibenzylamine (boiling point 215°C), dibutylamine (boiling point 169℃)
, n-tributylamine (boiling point 214°C), cyamylamine (boiling point 202°C), dioctylamine (boiling point 297°C)
), butoxypropylamine (boiling point 176°C), ink toxypropylamine (boiling point 160°C), 2-ethylhexyloylpropylamine (boiling point 1 at 100 mHg)
60°C), 1,4-diaminobutane (boiling point 158°C), and the like. Among these, basic primary amines are preferred from the viewpoint of color development. The amount of these organic amines to be used depends on their solubility in non-polar solvents, but is generally 5 to 95 times (11 times), preferably 20 times, relative to the developer.
~80% by weight. If it is less than 5 M(, "J:%"), there will be less amount of alkali, resulting in insufficient color development.

Further, if the liquid is more than 95%, the liquid viscosity tends to be low, and the permeability into the photosensitive paper is strong, lowering the image clarity and having an adverse effect on image fading.

On the other hand, in the present invention, silicone oil is used as a nonpolar solvent for dissolving the above-described specific organic amine. As is well known, silicone oil is a colorless, non-polar oily substance made of linear dimethylpolysiloxane that has particularly excellent heat resistance and chemical resistance. The boiling point and viscosity of this substance differ depending on the size of the molecular mass, but in the present invention, a boiling point of 150° C. or higher is preferred for the same reason as in the case of the amine. There are no particular restrictions on the viscosity, but when considering spreadability, permeability, adhesion amount, etc. to diazo photosensitive paper as a solvent for a developer for diazo copying, a solvent with too high a viscosity is not preferred. Therefore, when using a high viscosity silicone oil, it is recommended to use another low viscosity silicone oil or another low viscosity nonpolar solvent in combination so that the viscosity is suitable for a developer for diazo copying. Other low viscosity non-polar solvents used in Naoko\ are preferably those with a high boiling point of 150°C or higher for the reasons mentioned above, such as paraffinic, isoparaffinic, naphthenic or aromatic hydrocarbon solvents. .

The developer of the present invention comprising the above-mentioned components can be used in either a wet diazo development method in which diazo photosensitive paper is coated by dipping in the developer or a semi-dry diazo development method in which a fine coating is applied to diazo photosensitive paper by roll transfer. can also be applied. Note that the developer is heated if necessary to accelerate development.

The present invention will be explained below using examples. Note that all of the tai are stacked ts.

Example 1 40% n-octylamine and 60% silicone oil (
(1) A developer for diazo copying was prepared by mixing Shin-Etsu Silicone KF-96-1+10) with a viscosity of 25 centipoise (20 DEG C.).

Next, this developer was applied to the exposed commercially available θ〕2 by roll transfer.
Component-based diazo photosensitive paper coating (applying to photosensitive paper)
q-%f/4omy/A-4 version),
An image with an image density of 1.21 was obtained. In addition, this image was subjected to a forced deterioration test (Suga Test KK) using a fade meter.
Machine KK5M Long Life Fade Meter 1” A
-3 type was used for 3 hours of light irradiation) to examine the discoloration of the image. On the other hand, for comparison θ), a commercially available developer for diazo copying (consisting of 20% monoethanolamine, 40% ethylene glycol, and 40% methyl carbinol) was developed in the same manner and subjected to a restraint deterioration test.

The above results are shown in Table-1.
: Paint sharpness after test △Dmax : Amount of decrease in image sharpness after test As described above, the product of the present invention has excellent discoloration resistance.

Example 2 A diazo copying developer having a viscosity of 25 centipoise (20 DEG C.) was prepared by mixing 50% dicyclohexylamine and 50% silicone oil (Shin-Etsu Silicone I (F-96-300)).

Next, this developer was heated to 70°C and developed in the same manner as in Example 1.
= 1.24 and D'max = 1.15.

Example 3 20% n-aminozolobyl morpholine, 1D% dibenzylamine, silicone oil (Toray Silicone 81 (2
00-20+1) 60 degrees and boiling point 17゛4-189℃
Iso 7 Rough-in yarn Carbohydrogen solvent (Isopar H)
A diazo copying liquid having a viscosity of 28 centivoise (20° C.) was prepared by mixing 10% of the above ingredients. Hereinafter, development was carried out using this developer in the same manner as in Example 1j1, and a forced deterioration test was performed to obtain Dmax=1.22 and D'max==1.
．． 16 results were obtained. In addition, using this developing solution and the comparative developer used in Actual MQ Example 1, continuous copying was carried out on one sheet of commercially available two-component diazo photosensitive paper (size A-4 version), and the results of the copies were evaluated. Comparing the image quality and background, as well as the condition of the current f8 liquid after copying, Table 20
] Obtained the results.

Table 2 Note) Dmin: Background density The product of the present invention has good liquid stability, does not reduce image tackiness even after being copied to a large size, and does not stain the background.

Claims (1)

[Claims] 1. A diazo copying developer prepared by dissolving a liquid organic amine with a nodal point of 150°C or higher in silicone oil.