JP2529882B2 - Diazo correction image erasing solution - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a correction solution for a diazo copy image, and more specifically, a correction solution for erasing a copy image, which is suitable for reworking the color image of the second original diagram of diazo copy.

<Prior Art> The diazo copy second original drawing paper or film has been widely used in various fields in recent years for the purpose of reducing design man-hours. This is largely because the second original image of the diazo copy is easier to add and correct than the second original image of another copying method (for example, an electrophotographic method) and the cost is low. It is indispensable that the second original drawing can be modified from the purpose of use, and for that purpose, it is necessary to erase the copied image first. As an erasing method, it is general to use a correction, and as a correction solution, JP-A-48-26135 and JP-A-5-35135 are used.
Those disclosed in 2-26224 and JP-A-60-26357 are well known.

<Problems to be solved by the invention> The diazo second original diagram can be roughly classified into the following three types. 1
The second type is known as a wet development type, in which a photosensitive layer containing a diazo compound and a coupling component as a main component is provided on a support, and this material is superposed on an original and developed with an alkaline solution after exposure. It is a thing. The second is a type known as a dry development type, which is different from the wet type in that development is performed with ammonia gas. The third type is known as a heat-developable type, which is a type containing an ammonia gas generating agent such as urea capable of generating ammonia gas by heating in the photosensitive layer or trichloroacetic acid in the photosensitive layer. Such as a type containing an alkali salt of an acid that loses its properties as an acid by heating, a type utilizing activation of a diazo compound and a coupling component by heating and melting using a higher fatty acid amide as a color-forming aid, and the like. is there.

The wet type requires a lot of time to replenish and dispose of the developer because it uses a developer, and there are maintenance problems such as a large size of the device. The copy image has some problems such as not being able to withstand long-term storage. In addition, the dry type requires replenishment of the developing solution like the wet type, gas absorption equipment is required to prevent the generated ammonia gas from leaking to the outside, and therefore the size of the device is increased. , It has problems such as smell of ammonia immediately after copying. On the other hand, unlike the wet type and dry type, the heat development type has the merit of maintenance because it does not require a developing solution, but all the conventionally known types require a high development temperature of 150 ° C to 200 ° C. In addition, if the temperature is not controlled to about ± 10 ° C, the development cost may be insufficient and the color tone may change, resulting in an increase in the cost of the apparatus. Further, the diazo compound used for such high temperature development also needs to have high heat resistance, but such a compound is often disadvantageous for forming a high concentration. Many attempts have been made for low-temperature development (90 ° C to 130 ° C), but there is a drawback in that the shelf life of the material itself is shortened. Recently, it has become possible to solve the above-mentioned problems by introducing a technique of incorporating at least one of a diazo compound and a coupling component into a microcapsule. However, when erasing the copied image of the diazo copy second original image obtained by this method, the erasing of the copied image was insufficient even if a commercially available correction solution was used.

<Means for Solving the Problem> The present inventors have completed the present invention as a result of intensive studies to solve the above-mentioned problems. That is, the present invention relates to a correction liquid for erasing a diazo copied image, which contains an N-substituted cyclic amide.

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

N-methyl-2-pyrrolidone, 1-methyl-2-piperidone, 1-methyl-caprolactam, 1,5-dimethyl-2-pyrrolidone, 1-ethyl-pyrrolidone, 1-methyl-pyridone, N-methylsuccinimide, 1,3-dimethylethylene urea. Of these, N-methyl-2-pyrrolidone is most suitable. In order to impart permeability, volatility and the like to the correction fluid according to the present invention, alcohols such as methanol and ethanol, ketones such as MEK and acetone, ethers, organic solvents such as ethyl acetate and the above-mentioned conventional correction fluid components. Can be appropriately used as an additive. The amount added is preferably 50% by weight or less based on the total amount of the correction liquid.

<Effects of the Invention> As described in detail above, the correction liquid for erasing diazo copied images containing the N-substituted cyclic amide of the present invention showed extremely good erasability.

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

<Example> 1-morpholino-2,5-dibutoxybenzene-4-diazonium hexafluorophosphate 3.45 parts and xylylene diisocyanate and trimethylolpropane (3: 1)
18 parts 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 solution of the diazo compound was mixed with an aqueous solution in which 5.2 parts of polyvinyl alcohol was dissolved in 58 parts of water, and emulsified and dispersed at 20 ° C. to obtain an emulsion having an average particle size of 2.5 μm. 100 parts of water was added to the obtained emulsion, and the mixture was heated to 60 ° C. with stirring, and after 2 hours, a capsule liquid containing a diazo compound as a core substance was obtained.

Next, 10 parts of 2-hydroxy-3-naphthoic acid anilide and 10 parts of triphenylguanidine were added to 200 parts of a 5% polyvinyl alcohol aqueous solution and dispersed in a sand mill for about 24 hours,
A dispersion having an average particle size of 3 μ was obtained.

To 50 parts of the diazo compound capsule solution obtained as described above, 50 parts of a dispersion of a coupling component and triphenylguanidine and 10 parts of a 40% calcium carbonate dispersion were added to prepare a coating solution. This coating solution was coated with polyethylene terephthalate (75μ
m) was coated with a coating bar to a dry weight of 18 g / m ² and dried at 50 ° C. for 1 minute. The thus-obtained diazofilm was used as the second original image, and the copied image was corrected with the four kinds of correction solutions shown in Table 1. The correction method was to rub the correction area with a cotton swab moistened with the correction solution, and then wipe it off with a piece of paper. The results are as shown in Table 1.

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

Commercial correction fluid A; Ethylene glycol monoethyl ether acetate Commercial correction fluid B; Methyl cellosolve Commercial correction fluid C; Cyclohexanone

Claims (1)

(57) [Claims] 1. A correction liquid for erasing a diazo copied image, which contains an N-substituted cyclic amide.