JPH03275777A - Metallic ink composition and decorative paper - Google Patents

Abstract

PURPOSE:To obtain the subject composition having a viscosity suitable for gravure printing while keeping high solid content and capable of giving a decorative paper having excellent abrasion resistance, brightness and designability by compounding a benzoguanamine resin, a cellulosic resin, a metallic pigment and a solvent. CONSTITUTION:The objective composition contains (A) 1-20wt.% (preferably 3-6wt.%) of a benzoguanamine resin (preferably a resin having a molecular weight of 264-368, e.g. the butanol-modified benzoguanamine of formula), (B) 0-10wt.% (preferably 2-5wt.%) of a cellulosic resin (e.g. cellulose acetate or cellulose acetate butyrate), (C) 5-35wt.% of a metallic pigment and (D) preferably 70-80wt.% of a solvent. A decorative paper is produced by printing a titanium paper with the composition.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a decorative paper used for processing melamine resin, polyester resin, DAP resin, etc., and a metallic ink composition used therefor. The present invention relates to a metallic ink composition using a pigment of the same size and a highly designed decorative paper using the same.

[Prior Art] Conventionally, decorative paper used for processing with melamine resin, polyester resin, DAP resin, etc. is usually printed with a pattern or the like by a gravure printing method. When the ink used for such gravure printing is diluted with a solvent to a viscosity suitable for printing, cellulose-based binders are used as a binder to maintain suitability for impregnating the pattern area by reducing solidity as much as possible. Resins are commonly used.

On the other hand, the above-mentioned ink further contains a pigment having a particle size of about 0.5 to 1 μm, and such ink is used to print on base paper for decorative paper called titanium paper. At this time, because the particle size of the pigment is relatively small, it gets into the pulp fibers of the titanium paper, and as a result, when processing decorative paper with melamine resin, polyester resin, DAP resin, etc., it is difficult to immerse it in the impregnation. Even when the excess resin content on the decorative paper is removed using a scraping roll or the like, the pigment does not flow out, and the abrasion resistance of the ink in the pattern area has been ensured.

[Problem to be solved by the invention] However, in the case of pigments with relatively large particle sizes, such as metallic pigments for metallic inks and burl pigments, which are used for decorative boards in recent years, they tend to get into the bulb i+ miscellaneous during printing. If the solid content ratio of the resin to the pigment is not sufficient, the pigment may be removed from the printed surface by friction from the outside, especially by removal with a scraping roll as mentioned above. Problems have arisen in that the impregnation liquid is scraped off and spilled out, contaminating the impregnating liquid.

In particular, in ink using cellulose resin as a binder as described above, the solid content is less than 1011%, which means that the resin content to protect the pigment is small, so the above problems occur significantly, and to prevent this, the amount of resin is increased. In this case, the viscosity of the ink composition increases as the solid content increases, making printing difficult.

Therefore, the purpose of the present invention is to compensate for the above-mentioned drawbacks and to provide a metallic ink composition that has good processing suitability even when a large amount of metallic pigment with a relatively large particle size is blended, and a decorative paper that uses the same and has a high design quality. It is about providing.

[Means for Solving the Problems] In view of the above-mentioned problems, the inventors of the present invention have conducted extensive research, and have found that the present invention uses benzoguanamine resin, which is a resin with good processing suitability and a high solid content and low viscosity. The company discovered that even if a large amount of pigment with a relatively large particle size was added, it could be processed stably without reducing wear resistance.

In other words, the above object of the present invention is to use benzoguanamine resins of 1 to 20% by weight, cellulose resins of 0 to 10% by weight,
This can be achieved by providing a metallic ink composition containing 115 to 35% by weight of a metallic face and a solvent, and a decorative paper obtained by printing the metallic ink composition on titanium paper.

The present invention will be explained in more detail below.

In the present invention, by using a benzoguanamine resin as a binder together with a cellulose resin as necessary, it is possible to achieve a high solid content and low viscosity, and it is also possible to effectively coat large particle size metallic pigments. can.

Such benzoguanamine resin has a molecular length of 26
4 to 368 is preferred, and specific examples include butanol-modified benzoguanamine such as. In addition, the above benzoguanamine-based resin is contained in the metallic ink composition in an amount of 1 to 2 times.
Contains 0 weight percent, preferably 3 to 6 weight percent, but 20 weight percent
If the content is more than % by weight, the ink layer will protrude,
There may be a problem that the pigment tends to flow out due to friction, and if the content is less than 1% by weight, there may be a problem that the water resistance and chemical resistance of the ink layer are reduced.

In the present invention, the benzoguanamine resin described above may be used alone as a binder, or may be used in combination with a cellulose resin. When a cellulose resin is used in combination, it is contained in the composition at 10% by weight or less, preferably from 2% to 5% by weight.
Preferably, it is contained. The cellulose resin mentioned above is preferably heat resistant, such as cellulose acetate, cellulose acetate butyrate, and the like.

The metallic ink composition of the present invention contains a metallic pigment in an amount of 5 to 35% by weight, preferably 10 to 20% by weight. In particular, the present invention uses a metallic pigment having a particle size of about 3 to 60μ. It is valid. In the present invention, the particle size is expressed by the maximum length of the particle. As such metallic pigments, for example, pearl pigments, aluminum powder, etc. are used.

The metallic ink composition of the present invention further includes, if necessary,
It can contain various additives.

Examples of such additives include citric acid and oxalic acid, and these are contained in an amount of 1 to 20 parts by weight per 10,000 parts of the total amount of benzoguanamine resin and cellulose resin.

The metallic ink composition of the present invention contains the above-mentioned compounds dissolved in a solvent in amounts within respective ranges,
As such a solvent, for example, isopropyl alcohol (rPA), methyl ethyl ketone, cyclohexane, etc. can be used. In addition, these solvents may contain 60 to 95% in the composition.
It is contained in an amount of 70 to 80% by weight, preferably 70 to 80% by weight.

The viscosity of the composition prepared as described above was determined by the Zankatsubu method to be 1.
It is preferable to adjust the time within the range of 8 to 28 seconds, and more preferably within the range of 21 to 25 seconds.

In the present invention, the decorative paper of the present invention can be obtained by performing various types of printing on titanium paper using the above metallic ink composition. For example, titanium paper has a basis weight of 50
~100 (1/l+') is used. Printing can be performed using various printing methods, but the present invention is particularly suitable when using a gravure printing method.

In the decorative sheet of the present invention, even when the pigment is removed with a scraping roll during resin processing as described above, the pigment is sufficiently covered with the resin component having excellent chemical resistance, so that the pigment does not flow out.

The decorative paper of the present invention can be coated with an overcoat to further improve processing suitability. As such an overcoat, a mixture of benzoguanamine resin and cellulose resin applied to a thickness of 1 to 3 μm is used.

[Example〕 The present invention will be further explained below using Examples.

Reference Example The relationship between dilution ratio and viscosity was investigated when 100 g of each of an ink binder containing butanol-modified benzoguanamine resin as a main ingredient and an ink binder containing cellulose acetate resin as a main ingredient were diluted with a diluting solvent. The results are shown in Figure 1. However, the viscosity was measured using Zankatsubu #3.

From FIG. 1, it can be seen that in order to obtain the same viscosity, benzoguanamine resin can contain about 10 times as much solid content as cellulose acetate resin.

Example 1 A metallic ink composition containing a bar pigment with a particle size of 3 μm, 10 μm, 30 μm or 60 μm and having the following composition with the ink binder resin changed as shown in Table 1 was used, and the basis weight was 80 g/ After gravure printing a pattern on TA2 titanium paper with a gravure plate of 1001 in/1 nch and a depth of 80 μm to a thickness of 1.7 μm, the decorative paper was scraped off with a scraping roll. Table 1 shows the results of evaluating the abrasion resistance of the pattern area.

Metallic ink composition composition: benzoguanamine resin 5% by weight cellulose acetate resin 4% by weight Burl pigment
15% IPA
The 76% viscosity was measured in the same manner as in the reference example and was 22 seconds.

Table 1 ○: Good abrasion resistance △: Slightly poor abrasion resistance, but still practical ×: Not practical Example 2 Using a metallic ink composition with the following composition, the tsubo m 80
(J/ Spring's design on titanium paper, 1001ine
A decorative paper was obtained by gravure printing to a thickness of 17 μm using a gravure plate having a depth of 80 μm and a depth of 80 μm.

Benzoguanamine resin 6 wt% cellulose acetate resin 3 wt% Bar pigment (20
~60μm) 14x IA% solvent
The decorative paper obtained with a protein content of 77% had excellent abrasion resistance, and also had a high brightness and a high design feeling.

Example 3 A metallic ink composition having the following composition was used to print 1180 tsubo
(Decorative paper was obtained by gravure printing a pattern on 1/t' titanium base paper for melamine resin molding to a thickness of 1.5 μm using a gravure plate of 1001 ine/'1 nCh and depth of 80 u11.

Benzoguanamine resin 5% by weight Cellulose acetate resin 4% by weight Iridescent Burl pigment (
20-60μm> 15% by weight solvent
The decorative paper obtained had excellent abrasion resistance, high brightness, and high design.

[Effects of the Invention] As described in detail above, the present invention makes it possible to provide a metallic ink composition that maintains a high solid content ratio and has a viscosity suitable for gravure printing. As a result, excellent processing suitability can be obtained even when a large amount of metallic pigment with a relatively large particle size is blended.

Furthermore, the metallic ink composition of the present invention makes it possible to provide a decorative paper having excellent jlFl abrasion resistance in the pattern area, high brightness, and high design feeling due to improved iris color effect.

[Brief explanation of drawings]

FIG. 1 is a graph showing the relationship between viscosity and solid content with respect to dilution ratio when benzoguanamine resin and cellulose acetate resin are diluted with a solvent.

Claims (2)

[Claims] (1) Metallic ink composition containing 1 to 20% by weight of benzoguanamine resin, 0 to 10% by weight of cellulose resin, 5 to 35% by weight of metallic pigment, and a solvent. (2) A decorative paper obtained by printing the metallic ink composition according to claim (1) on titanium paper.