JPH0299570A - Liquid eraser for diazo-copied image - Google Patents

Abstract

PURPOSE:To provide the title liquid eraser having excellent erasing ability, thus suitable for modifying the color-developed image of diazo-copied second original drawing, containing an N-substituted cyclic amide. CONSTITUTION:The objective liquid eraser containing an N-substituted cyclic amide (pref. N-methyl-2-pyrrolidone). To impart this eraser with penetrability, volatility, etc., pref. <=50wt.%, based on the whole amount of said eraser, of a solvent such as methanol, ethanol, MEK, acetone, ether or ethyl acetate may be used.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a correction liquid for diazo copy images, and more specifically, a correction liquid for erasing a copy image suitable for retouching a colored image of a second original diazo copy.

<Prior Art> In recent years, diazo copying second original paper or film has been widely used in various fields for the purpose of reducing design man-hours. The main reasons for this are that diazo copy tube original drawings are easier to add to and modify and are cheaper than second original drawings made by other copying methods (for example, electrophotographic methods).

It is essential that the second original drawing can be modified due to its intended use, and for this purpose, it is first necessary to erase the copied image.

As a method of erasing, it is common to use a correction fluid, and as a correction fluid, JP-A-Sho≠r-1613! No., Tokukai Akira! The ones disclosed in Koh 2622 and Japanese Patent Application Laid-Open No. 60-263!7 are well known.

<Problems to be solved by the invention> Diazo second original drawings can be roughly divided into the following three types. One type is known as a wet development type, in which a photosensitive layer containing a diazo compound and a coupling component as main components is provided on a support, this material is superimposed on the original, and after exposure, it is processed in an alkaline solution. It is to be developed. Kotsume is a type known as a dry development type, and unlike the wet type, development is performed using ammonia gas. The third type is known as a heat-developable type, and includes a type that contains an ammonia gas generating agent such as urea that can generate ammonia gas when heated in the photosensitive layer, and a type that contains an ammonia gas generating agent such as urea that can generate ammonia gas when heated, or a type that contains ammonia gas generating agent such as trichloroacetic acid in the photosensitive layer. There are types that contain an alkali salt of an acid that loses its properties as an acid when heated, and a type that uses a higher fatty acid amide as a coloring aid and activates the cydiazo compound and coupling component by heating and melting.

The wet type uses a developing solution, which requires time and effort to replenish and dispose of the solution, and the device is large, which poses maintenance problems. , there are several problems such as copy images not being able to withstand long-term storage. In addition, like the wet type, the dry type requires replenishment of developer, requires gas absorption equipment to prevent the generated ammonia gas from leaking outside, and therefore requires larger equipment.
There are problems such as the smell of ammonia immediately after copying. On the other hand, unlike the wet and dry types, the heat developable type has the advantage of maintenance because it does not require a developer, but all conventional types require high developing temperatures of ISO 0C to 2000C. Moreover, unless the temperature was controlled to about ±70° C., insufficient development occurred or the color tone changed), which resulted in a problem of increased equipment cost. Furthermore, the diazo compound used for such high-temperature development is required to have high heat resistance, but such compounds are often disadvantageous in forming high concentrations. Low temperature development (P o 'C-t
3 o oC) OF+4 Although it has been widely used, it has the drawback of decreasing the shelf life of the material itself. Recently, it has become possible to solve the above-mentioned problems by introducing a technique in which at least one of a diazo compound and a coupling component is contained in microcapsules. However, when erasing the copied image of the diazo-copied λ original obtained by this method, the erasure of the copied image was insufficient even when a commercially available correction fluid was used.

Means for Solving the Problems> The present inventors have completed the present invention as a result of intensive research to solve the above-mentioned problems. That is, the present invention relates to a correction fluid for erasing diazo-copied images, which is characterized by containing N-treated cyclic abad.

Preferred examples of the N-substituted cyclic amide used in the present invention include the following compounds.

N-methyl-2-pyrrolidone, l-methyl-2-pyridone, no-methyl-caprolactam, /.

! -Simeter-cohyrolidone, l-ethyl-pyrrolidone, /-methyl-pyridone, N-methylsuccinimide, /, 3-dimeter ether/urea.

Among these, N-methyl-λ-pyrrolidone is most preferred. Alcohols such as methanol and ethanol are used to impart permeability and volatility to the correction fluid according to the present invention.
Ketones such as MEK and acetone, organic solvents such as ether and ethyl acetate, and the aforementioned conventional correction fluid components can be used as appropriate additives. The amount added is based on the total amount of correction fluid! It is preferable that it is 0% by weight or less.

<Effects of the Invention> As detailed above, the correction fluid for erasing diazo copied images containing the N-substituted cyclic amide of the present invention exhibited extremely good erasability.

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to these Examples.

<Example> l-morpholino-2,! -Dibutoxybenzene-μm diazonium hexafluorophosphate 3°4L! xylylene diisocyanate and trimethylolpropane (
J:/) It part of the adduct was added to a mixed solvent of 6 parts of tricresyl phosphate and 5 parts of ethyl acetate, and dissolved by heating. This diazo compound solution was mixed with an aqueous solution containing 5.2 parts of polyvinyl alcohol dissolved in 51 parts of water, emulsified and dispersed at 20°C, and the average particle size was 2. An emulsion of jμ was obtained. Ioo parts of water were added to the obtained emulsion, and the emulsion was heated to tθ0C without stirring, and after 2 hours, a capsule liquid containing a diazo compound in the core substance was obtained.

Next, 10 parts of 2-hydroxy-3-naphthoic acid anilide and 70 parts of phenylguanidine were added to 200 parts of j% polyvinyl alcohol aqueous solution and dispersed in a sand mill for about 2 hours to obtain a dispersion with an average particle size of 3 μm. Ta.

A dispersion of the coupling component and triphenylguanidine is added to 50 parts of the capsule solution of the diazo compound obtained as described above! A coating solution was prepared by adding part Q and io part of a ≠0% calcium carbonate dispersion. This coating solution was applied to polyethylene terephthalate (7! μrn), a transparent support whose opposite side was matte-treated, using a coating parlor and placed in a drying room.
Apply it so that it becomes lr y/m2, and! Dry at OoC for 7 minutes.

The diazo film thus obtained was used as a second original image, and the copied image was corrected with a correction fluid of the type listed in Table 1. The correction method involved rubbing the repaired area with a cotton swab dripping with correction fluid, then wiping it off with a piece of tissue paper. The results were as shown in Table 1.

The main components of the commercially available correction fluids shown in Table 1 are as follows.

Commercially available correction fluid A; Ethylene glycol monoethyl ether acetate Commercially available correction fluid B; Methylceronlube Commercially available correction fluid C; Cyclohexanone

Claims (1)

[Claims] A correction liquid for erasing diazo-copied images, characterized by containing an N-substituted cyclic amide.