JP2003096418A - Book-binding paste for developed diazo paper, method of binding developed diazo paper and book-bound developed diazo paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a book-binding paste for developed diazo paper that is suitable for binding developed diazo paper sheets with out discoloration, provide a method of binding the developed diazo paper sheets by using the paste, and provide a book produced by binding the diazo paper sheets with the paste. SOLUTION: A book-binding paste for diazo developing paper sheets, characteristically including urea or a urea compound, the method of binding the developed diazo paper sheets to a book characteristically by using the paste, and the book produced by binding the developed diazo paper sheets characteristically by using the book-winding paste are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a binding agent for diazo developing paper, a method for binding diazo developing paper, and a binding method for diazo developing paper. The present invention relates to a binding agent for diazo developing paper, which is suitable for bookbinding, and which does not occur, and a binding method for diazo developing paper using this adhesive, and a binding method for diazo developing paper using this adhesive.

[0002]

2. Description of the Related Art Generally, the development by the diazo photographic method is used for micro photography, copying of drawings, simple copying for office work, etc., and it is particularly preferable for copying of large format drawings. Therefore, most users fold A1 size developing paper into A2 size, fold A2 size into A3 size, or fold A3 size into A4 size and store it. There is. Also, fold a B2 size developing paper into a B3 size,
The current situation is to use a wood-brushing adhesive or the like to apply a brush to bind and store the book.

However, the method of bookbinding and storage as described above does not pose any particular problem for the developing paper obtained by the wet diazo method, but for the developing paper obtained by the high-speed dry diazo method, it is a common adhesive for woodworking. When such glue is used, the portion of the developing paper (mainly the central portion and the end portion) to which the glue is applied turns red, which contaminates the developing paper and makes it difficult to see the drawings. It causes inconvenience. Especially, under the present circumstances where high-speed dry diazo method development is more widely accepted by users, such inconvenience becomes a serious problem in practical use.

The phenomenon in which the portion of the developing paper to which the adhesive has been applied is discolored is that the metal salt of the coloring agent separates due to the presence of water between the diazo developing portion and the adhesive surface, and the red color of the original coloring agent is removed. It is presumed that it is due to returning to purple. If a solid paste that does not contain water is used, this discoloration phenomenon will not occur, but in order to spread the paste evenly over the developing paper, the solid paste has poor spreadability and A suitable glue is hard to say. In addition, it is also unsuitable for bookbinding because it produces scraps. Due to such circumstances, glue containing water is often used, but no measures have been taken so far to prevent or suppress the above-mentioned discoloration phenomenon.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and does not cause discoloration when binding a diazo developing paper with glue, and is suitable for bookbinding. It is an object of the present invention to provide a bookbinding glue, a method for binding a diazo developing paper using this glue, and a bookbinding for a diazo developing paper using this glue.

[0006]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present inventors have made intensive studies by paying attention to the components to be contained in the bookbinding paste, and as a result, urea or a urea compound has been selected as the component. It has been found that, by using, a binder for diazo developing paper can be obtained without causing discoloration when binding the diazo developing paper with binding, and the present invention is based on this finding. Came to complete.

That is, according to the present invention, firstly, there is provided a glue for binding a diazo developing paper, which is characterized by containing urea or a urea compound, and secondly, the diazo developing paper is glued. A bookbinding method for a diazo developed paper is provided, wherein the first bookbinding glue is used as the glue for the bookbinding, and the third is a bookbinding method in which the diazo developed paper is glued. As the glue, there is provided a book binding of the diazo developing paper, which is characterized by using a first glue for binding the diazo developing paper.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention firstly provides a bookbinding paste for diazo developing paper, which is characterized by containing urea or a urea compound. The bookbinding paste containing urea or a urea compound is not particularly limited, but one containing an adhesive resin as a main component is preferable. A vinyl acetate resin is suitable as the adhesive resin. Further, the bookbinding glue contains water.

The present invention is a glue for binding to diazo developing paper, which is characterized in that urea or a urea compound is contained in such glue. Urea compounds As compounds, thiourea,
Ethylene urea is preferably used. The urea or urea compound may be used alone or in combination.

The amount of water is usually 5-10% by weight.
If the amount of water exceeds 10%, it may cause red discoloration, which is not desirable. The amount of urea or urea compound is usually 1 to 10%.

The bookbinding glue according to the present invention has a viscosity of 3
It is preferably 2000 to 3000 cps at 0 ° C., and its pH is preferably 3 to 4.

Secondly, according to the present invention, when the diazo developing paper is bound and bound for binding, the bookbinding glue of the first diazo developing paper is used as the glue. A binding method is provided.

Further, the present invention is, thirdly, a bookbinding method in which diazo developing paper is glued, wherein the glue for binding the first diazo developing paper is used as the glue. Providing bookbinding for developed paper.

Bookbinding of the diazo developing paper of the present invention is carried out, for example, by
The bookbinding is obtained by the second method for binding the diazo developed paper, but it is sufficient if it uses the binding agent for binding the first diazo developed paper, and the bookbinding method is not necessarily obtained by the method for binding.

[0015]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

Examples 1 to 3 and Comparative Example 1 As diazo developing papers (50 sheets) having different background densities, a background density of 0.128, a background density of 0.152 and a background density of 0.202 were prepared, and the following pastes were used. It was glued and bound. Glue: Vinyl acetate glue (Konishi Bond CN-1). 5 g of water is added to 100 g of the paste. In addition, urea is added to this glue.

After the bookbinding, the degree of red discoloration was visually observed after 2 hours had passed. The evaluation criteria are as follows. 5: When there is no discoloration at all background densities. 4: When there is some discoloration at the background density of 0.202. 3: When there is discoloration at the background brightness of 0.202 and 0.152. 2: When there is discoloration at background densities of 0.202 and 0.152 and slight discoloration at background density of 0.128. 1: When there is discoloration at all background densities. In Comparative Example 1, urea was not added.

The evaluation results are shown in Table 1.

[Table 1]

[0019]

According to the present invention, there is provided a binding agent for diazo developing paper, which is not discolored when the binding is applied to the diazo developing paper and is suitable for bookbinding. A method for binding diazo developed paper and binding of diazo developed paper using this glue are provided.

Claims (7)

[Claims] 1. A binding agent for bookbinding of diazo developing paper, characterized by containing urea or a urea compound. 2. The binding agent for bookbinding of diazo developed paper according to claim 1, wherein the binding agent has an adhesive resin as a main component and water. 3. The bookbinding glue for diazo developed paper according to claim 2, wherein the adhesive resin is a vinyl acetate resin. 4. The bookbinding glue for diazo developed paper according to claim 1, wherein the urea compound is thiourea or ethyleneurea. 5. The content of the urea or urea compound is 1 to 10% by weight based on the binding paste.
4. The glue for binding the diazo developed paper according to any one of 4 above. 6. A diazo developing paper bookbinding paste according to any one of claims 1 to 5, wherein the diazo developing paper bookbinding paste is used as a binder for binding the diazo developing paper. Binding method. 7. A bookbinding method in which diazo developing paper is glued, wherein the glue for binding the diazo developing paper according to any one of claims 1 to 5 is used. Binding of developed paper.