JP2002274984A - Decorated ceramic ware and transfer paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide decorated ceramic ware having a beautiful three- dimensional, thickly coated patterns and a transfer paper for painting. SOLUTION: The decorated ceramic has a patterned layer painted using paints of one or more colors containing inorganic pigments and a glass flux on top of a glazed layer prepared by glazing the surface of a ceramic green layer, and a glass coating layer on top of the glazed layer or the patterned layer. The glass softening point of a glass composition composing the glass coating layer is higher than that of a glass flux in the paint by from 5 to 50 deg.C. The glass coating layer after burning has a thickness of from 20 to 200 μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pattern layer using one or more colors containing an inorganic pigment and a glass flux on a surface of a ceramic base material layer or on a glaze layer further glazed, and on the pattern layer. The present invention relates to a decorative porcelain and a transfer paper for painting having a glass coat layer, and more particularly to a decorative porcelain and a transfer paper for painting which enable a beautiful finish with a three-dimensional effect and a lively feeling by the thick asperity of the glass coat layer.

[0002]

2. Description of the Related Art Ornament ceramics decorated with inorganic pigments (inorganic paints) are generally composed of a base layer, a glaze layer, and a picture layer in order in cross section. The picture layer is also referred to as a decorative part, and is a mixture of inorganic pigments that express various colors on a light-colored base layer and colorless and transparent glass (Western paint)
Alternatively, a colored glass powder (Japanese paint) obtained by dissolving a pigment in a colorless and transparent glass is applied from above the glaze layer and fixed by firing.

[0003] The decorating method of decorative ceramics can be roughly classified according to the positional relationship between the glaze layer and the pattern layer, firstly the underglaze painting method (in the order of the base layer, the pattern layer and the glaze layer), and secondly. In-glaze painting method (in the order of the base layer, the pattern layer partially or completely settled in the glaze layer, and the glass coat layer), and thirdly, the on-glaze painting method (the base layer, the glaze layer, and the pattern layer) It is classified and has each characteristic.

[0004]

In general, ceramic decoration by inglaze painting has many excellent features in terms of color and durability, but the decorative pattern formed by this inglaze painting has a pattern layer. Since the thickness of the glass coat layer formed thereon after firing is usually as thin as 7 to 8 μm, the glass coat layer is planar and lacks a three-dimensional effect and a sense of movement.

[0005] In the conventional on-glaze painting, a glass coat is hardly applied further on the picture layer. In rare cases, for example, when it is desired to particularly emphasize the gloss of the surface or when a colored pigment used as a paint is used. Cadmium (C
In order to minimize the elution of the compound containing a heavy metal as in d), it is coated with a glass having a thickness of several μm. Also in this case, the decorative pattern is planar and lacks a three-dimensional effect and a sense of dynamism.

In order to perform thick decoration, a technique of simply increasing the thickness of the picture layer alone can be considered. However, since the picture layer uses a large number of colors (paints), there is a problem that the number of printings is inevitably increased. . For example, in a commonly used screen printing method or a transfer paper using the same, it is necessary to prepare printing plates for the number of colors used for the picture layer, and the printing thickness that can be printed at one time is usually about 10 to 20 μm. Therefore, in order to make the thickness after firing 50 to 100 μm or more, it is necessary to print a plurality of times for each printing plate. As described above, when the number of times of printing is increased, an adjacent color is likely to be overlapped, and a picture is likely to be blurred. Further, if a space between colors is provided to avoid overlapping of colors, it is impossible to create a fine picture.

Even if a glass coat layer is simply thickened on a ceramic picture layer by on-glaze painting to give a three-dimensional effect or a sense of dynamism, the pigment of the paint in the picture layer will be replaced by the glass composition in the glass coat layer. The color of the picture layer can be reduced, such as bleeding or thinning due to the reaction, depending on the components of the glass composition, the color may change by reacting, the glass coat layer may become cloudy white, the surface may be uneven, or bubbles may remain. There was a problem of affecting.

In order to prevent discoloration due to the reaction between the paint and the glass composition, there is a case where a technique of using a glass composition having the color for each color of the paint is used, but the glass composition is distinguished for each color of the paint. It is troublesome to use it, and when the pattern is multicolored, it is necessary to perform lamination printing many times for each color.

A first object of the present invention is to provide a decorative porcelain and a transfer paper for painting, which have a beautiful finish with a three-dimensional appearance of a picture by thick embossing.

A second object of the present invention is to provide a decorative porcelain and a transfer paper for painting which can correspond to each color paint.

[0011]

According to a first aspect of the present invention, there is provided one or two inorganic pigments and glass fluxes on the surface of a ceramic body layer or on a glaze layer further glazed.
In a decorative ceramic having a picture layer using a color or more paint, and a glass coat layer formed on at least the picture layer, the glass composition constituting the glass coat layer is transparent and the glass softens. The point is 5 to 50 ° C. higher than the glass softening point of the glass flux in the paint, and the thickness of the glass coat layer is 20 after firing.
２００200 μm.

According to a second aspect of the present invention, there is provided a transfer paper for painting for painting a ceramic surface, wherein at least a water-soluble adhesive layer formed on a backing paper and a predetermined adhesive layer on the adhesive layer are provided. A pattern layer using one or more colors including an inorganic pigment and a glass frit printed at a position, and 5 to 50 ° C. from the glass softening point of the glass flux in the paint on the adhesive layer or the pattern layer. It is formed of a glass composition having a high softening point and has a thickness of 20 to 2 after firing.
And a transparent glass coat layer formed so as to have a thickness of 00 μm.

In the decorative ceramics or the transfer paper for painting, the thickness of the glass coat layer is 30 to 150 μm in a fired state in order to express the smoothness of the coat surface and the three-dimensional appearance of the pattern. Preferably, there is.

Further, in the decorative ceramics or the transfer paper for painting, the thickness of the glass coat layer is preferably 40 to 100 μm in a state after firing, in consideration of the merchantability.

Further, in the decorative ceramic or the transfer paper for painting, the softening point of the glass composition constituting the glass coat layer is determined by considering the smoothness of the coat surface and the light transmittance of the entire coat layer. It is preferable that the temperature is 10 to 25 ° C. higher than the glass softening point of the glass flux in the paint.

In the decorative ceramics or the transfer paper for painting, the glass composition constituting the glass coat layer is preferably transparent, and more preferably colorless and transparent.

In the decorative ceramic or the transfer paper for painting, the difference between the coefficient of thermal expansion of the glass composition constituting the glass coat layer and the coefficient of thermal expansion of the glass flux contained in the picture layer is ± 2. × 10 ^{−6 or} less, preferably ± 1 × 10 ^{−6 or} less, more preferably −1 to 0 × 10
^If it is selected in this range, an appropriate compressive stress is applied to the adhesive strength with the picture layer after cooling, so that the thickness of the glass coat layer can be further increased.

Further, in the decorative ceramic or the decorating transfer paper, the composition ratio of the glass composition constituting the glass coating _{layer, Li 2 O: 0~1wt%,} K 2 O: 0
１1 wt%, Na ₂ O: 0 to 10 wt%, BaO: 0
1 wt%, CaO: 0.1-3 wt%, ZnO: 0.1
-10 wt%, MgO: 0-1 wt%, PbO: 30-
60 wt%, Al ₂ O ₃ : 0.1 to 10 wt%, SiO
_{2: 20~40wt%, B 2 O} 3: 0~30wt%, P
₂ O ₅ : 0 to 1 wt% is preferred.

In the decorative ceramic or the transfer paper for painting, the composition ratio of the glass composition forming the glass coat layer is K ₂ O: 0.1 to 0.3 wt%, Na
₂ O: _{2 to} 5 wt%, CaO: 0.5 to 1 wt%, Zn
O: 0.5 to 5 wt%, MgO: 0.2 to 0.5 wt%
%, PbO: 40 to 50 wt%, Al ₂ O ₃ : 1 to ₃ w
_{t%, SiO 2: 25~35wt%} , B 2 O 3: 5~2
Preferably, it is 5% by weight.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION A pattern layer using one or more colors containing an inorganic pigment and a glass flux on a glaze layer (2 in FIG. 1) glazed on the surface of a ceramic base layer (1 in FIG. 1). A glass composition constituting the glass coat layer in a decorative ceramic having (3 in FIG. 1) and a glass coat layer (4 in FIG. 1) formed on the glaze layer or the outermost surface on the picture layer. The glass softening point of 5 to 50 ° C. higher than the glass softening point of the glass flux in the paint, and setting the thickness of the glass coat layer to 20 to 200 μm after firing, so that the glass coat layer is thickened Even in this case, a smooth and stable layer free from discoloration and bubbles can be formed.

[0021]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view schematically illustrating a fired decorative ceramic according to one embodiment of the present invention.

This decorative ceramic has a base layer 1 and a glaze layer 2
And a picture layer 3 and a glass coat layer 4.

The base layer 1 is not particularly limited. However, when the base layer 1 is applied to a soft porcelain such as a bone china, which is praised in a hotel or a restaurant, the effect is remarkably exhibited. This kind of porcelain is composed of 25 to 33 parts by weight of kaolin, 0 to 1 clay.
5 parts by weight, silica sand 0-35 parts by weight, feldspar 0-15 parts by weight,
0 to 50 parts by weight of bone ash, 0 to 3 parts by weight of dolomite, 0 to 2 of cornwall stone (partite kaolinized feldspathic granite)
It consists of 5 parts by weight of the raw material composition. As for the production method, the formed product is dried, then hardened at a temperature of 1200 ° C to 1300 ° C, glazed, and then fired at 1100 ° C to 1200 ° C.

As the glaze to be the glaze layer 2, a glaze suitable for the ceramic body is appropriately selected.
The chemical composition is generally Na ₂ O: 0 to 2.4 wt%, K ₂ O:
3.5-6.3 wt%, CaO: 0-4.6 wt%, Z
nO: 0 to 1.7 wt%, PbO: 25.2 to 66.8
_{wt%, B 2 O 3:} 0~7.7wt%, Al 2 O 3: 3.4
８8.5 wt%, SiO ₂ : 28.5 to 47.1 wt%
Other examples include Fe ₂ O ₃ and TiO ₂ . The glaze used is slightly lower than the coefficient of thermal expansion of the base part, and is preferably higher than the glass flux of the picture layer 3 and the coefficient of thermal expansion of the transparent thick glass composition of the glass coat layer 4.

The picture layer 3 is a layer having a thickness (about 10 μm) that exhibits a three-dimensional effect and color when viewed from the outside. The pattern layer 3 is provided on the glaze layer 2 and usually has a colorless and transparent glass flux and heat resistance. And a desired number of colored inorganic pigments having excellent properties.

The glass flux used for the picture layer 3 is made of a predetermined oxide, and the necessary chemical components are determined so as to have a desired glass composition in relation to the softening point of the glass composition of the glass coat layer 4. . Industrial products such as oxides, carbonates, nitrates, and complex oxides containing specified chemical components, reagents, and natural materials such as kaolin and various feldspars are appropriately selected and prepared as starting materials. This mixture is mixed for several hours to several tens of hours with a mixer such as a dry or wet ball mill so as to be sufficiently uniform while also serving as a pulverizing step. Next, in the case of a wet type, the mixture is transferred to a dryer and dried sufficiently, and then the dried mixture is placed in a furnace maintained at a predetermined temperature in a refractory crucible, for example, alumina, chamotte, refractory clay, platinum, or the like. Fill and charge. The homogeneously molten and vitrified molten material is quickly dropped into water and rapidly cooled to obtain a homogeneous glass block. This glass lump is finely pulverized by a ball mill or the like so as to have an average particle size of several μm, and a bonding material (glass flux) for adhering the inorganic pigment.
And In this pulverizing step, a coarse inorganic pigment may be added at the same time, and in this case, pulverization and mixing can be achieved simultaneously. The chemical composition of the glass flux is not limited to specified ones, Na ₂
O, K ₂ O, CaO, ZnO, PbO, B ₂ O ₃ , Al ₂ O
₃ , SiO ₂ , and other oxides Li ₂ O if necessary.
MgO, BaO, P ₂ O _{5 and the} like are included. For example, Na
₂ O: 6.4 to 12.2 wt%, K ₂ O: 0 to 0.5 wt%
%, CaO: 0.1 to 7 wt%, ZnO: 0 to 0.5 w
t%, PbO: 16~48.1wt%, B 2 O 3: 0~2
9.2, Al ₂ O ₃ : 0.7 to 8.2 wt%, SiO ₂ :
20.5-45.5 wt%. A high temperature is desirable to form a homogeneous glass, but if it is too high, the crucible may be eroded by this molten glass, or the transpiration and transpiration of the constituents may become significant, and the chemical composition of the molten glass may change significantly. Therefore, generally 1200 to 1400 ° C
Is selected.

The inorganic pigment used for the picture layer 3 is a coloring element, and is a pigment generally used in the ceramic industry. The names of inorganic pigments include Turkish blue, lemon yellow, malon, selenium red, circle, pink red, vanadium yellow, azure, navy blue, etc.In the form of compounds, cobalt oxide, iron oxide, copper oxide , Manganese oxide, chromium oxide, nickel oxide, tin oxide and the like and their composite oxides are often used.

The inorganic pigment is mixed with the glass flux and is called a paint. In this mixing step, each is separately pulverized and then mechanically mixed, or the inorganic pigment and the glass flux are sufficiently pulverized in advance. A mixture obtained by atomization may be used. The mixture is then heated, for example,
After holding and sintering at 600 to 700 ° C for one to several hours,
After quenching, the sintered product is pulverized again until the desired particle size is obtained. In the paint that has been subjected to such processing, the inorganic pigment and the glass flux are integrally consolidated, so that troubles such as separation of components in a later step can be avoided. The composition ratio of the inorganic pigment and the glass flux is such that the inorganic pigment is 0.5 to 100 parts by weight, preferably 1 to 100 parts by weight of the glass flux.
To 30 parts by weight, more preferably 2 to 15 parts by weight,
It can be properly used depending on the color intensity of the inorganic pigment used.

The glass composition used for the glass coat layer 4 is composed of a predetermined oxide, and the necessary chemical components are determined so as to obtain a desired glass composition in relation to the softening point of the glass flux contained in the paint. . Here, industrial products such as oxides, carbonates, nitrates, and composite oxides containing chemical components determined to be 5 to 50 ° C. higher than the glass softening point of the glass flux in the paint, reagents or kaolin, Natural raw materials such as various feldspars are appropriately selected and prepared as starting materials. This mixture is mixed for several hours to several tens of hours with a mixer such as a dry or wet ball mill so as to be sufficiently uniform while also serving as a pulverizing step. Then, in the case of a wet type, after transferring this mixture to a dryer and drying it sufficiently,
The dried mixture is charged into a furnace maintained at a predetermined temperature in a refractory crucible, for example, made of alumina, chamotte, refractory clay, platinum, or the like. The homogeneously molten and vitrified molten material is quickly dropped into water and rapidly cooled to obtain a homogeneous glass block. This glass lump is finely pulverized by a ball mill or the like so that the average particle diameter becomes several μm. Although the chemical composition of the glass flux is not particularly limited, K ₂ O, Na ₂ O, Ca
O, ZnO, MgO, PbO, Al ₂ O ₃ , SiO ₂ , B
₂ O _{3 and} other oxides Li ₂ O and Ba as required
O, P ₂ O ₅ , and the like. For example, Li ₂ O: 0 to 1 w
_{t%, K 2 O: 0~1wt} %, Na 2 O: 0~10wt
%, BaO: 0-1 wt%, CaO: 0.1-3 wt%
%, ZnO: 0.1 to 10 wt%, MgO: 0 to 1 wt%
%, PbO: 30 to 60 wt%, Al ₂ O ₃ : 0.1 to
_{10wt%, SiO 2: 20~40wt%} , B 2 O 3:
_{0~30wt%, P} 2 O 5: is a 0~1wt%. Preferably, K ₂ O: 0.1 to 0.3 wt%, Na ₂ O: 2
-5 wt%, CaO: 0.5-1 wt%, ZnO: 0.
5-5 wt%, MgO: 0.2-0.5 wt%, Pb
_{O: 40~50wt%, Al 2 O} 3: 1~3wt%, S
_{iO 2: 25~35wt%, B 2} O 3: 5~25wt%
It is. A high temperature is desirable to form a homogeneous glass, but if it is too high, the crucible may be eroded by this molten glass, or the transpiration and transpiration of the constituents may become significant, and the chemical composition of the molten glass may change significantly. Therefore, a melting temperature of 1200 ° C. to 1400 ° C. is generally selected.

The measurement of the softening point was obtained by using an ordinary differential thermal expansion measuring device. Diameter 5 with both ends parallel and smooth
A glass rod cut out to a length of about 10 mm and a length of about 10 mm is set in the apparatus, heated at a heating rate of 10 ° C./min, and the temperature (t) and the elongation (Δl / l) of the glass rod are measured. The temperature at which the rate changes from the maximum to the minimum, that is, the convex point of the graph, was taken as the softening point of this glass (see FIG. 2).

The pattern can be formed by a conventional technique such as a conventional technique such as itchin or color, but it is preferable to use a screen printing method. The so-called transfer paper method is also preferable in the screen printing method, and the method for producing the transfer paper is to overprint the screen printing by the number of colors while changing the printing plate according to the required number of colors in order to obtain a predetermined pattern on the mount. 10 to 30 μm thick
A multicolor pattern layer having the above dry thickness is obtained. Next, a predetermined thickness of the transparent glass composition is printed once or thinly several times so as to have a predetermined thickness from above the printed picture layer, thereby obtaining a glass coat having a dry thickness of 30 to 300 μm.

A ceramic having a substantially flat portion, for example,
In the case of a tile or a flat plate, printing can be performed directly from above without using transfer paper to obtain a picture layer and a glass coat layer having a desired thickness. Since the thickness of the glass coat layer after firing is reduced to about ２〜 to ／ of the thickness after printing and drying, the thickness is preferably 30 μm or more. If the thickness is less than 30 μm, it is difficult to obtain a desired pattern full of a three-dimensional effect. In this embodiment, the thickness is preferably about 30 to 200 μm, and may be more than this.

Next, a method of manufacturing the decorative ceramics according to the present embodiment will be described. A picture layer or a glass coat layer on a transfer paper is attached to a predetermined position on a glaze layer glazed on the surface of the ceramic base layer. Thereafter, the picture layer and the glass coat layer are simultaneously fired only once. The firing conditions are atmospheric pressure, atmospheric pressure, 850 ° C., and 100 to 120 minutes.

Next, the present embodiment will be described in comparison with a comparative example. Table 1 shows the weight composition ratio of the glass composition used for the glass coat layer in each sample. Table 2 shows the glass softening point and use of each glass composition.

[0035]

[Table 1]

[0036]

[Table 2]

The ceramic body of each sample is made of bone china.
Ground (33 parts by weight of kaolin, 10 parts by weight of silica sand, 15 layers of feldspar)
Parts by weight, bone ash 42 parts by weight). Also, each
The glaze of the sample has a chemical composition of Na_TwoO: 2.34 wt%,
K_TwoO: 3.55 wt%, CaO: 4.55 wt%, Z
nO: 1.65 wt%, PbO: 25.22 wt%, B
_TwoO_Three: 7.67 wt%, Al_TwoO_Three: 7.98 wt%, S
iO_Two: 47.05 wt% in common.
The design of each sample is as follows.
Use the prescribed paint of 5 colors or more used as flux
In that they are common.

As a manufacturing condition, a pattern or glass composition on a transfer paper was attached to a predetermined position on a glaze layer glazed on the surface of a ceramic base material layer. Here, the thickness of the multicolored pattern layer is constant at about 10 μm after firing, and the thickness of the glass coat layer is 10 to 15 μm after firing.
(Normal overcoat glass), 30-40 μm
(Thick embossing) and 70 to 85 μm (super thick embossing). The firing conditions are air, atmospheric pressure, 8
50 ° C. for 100 to 120 minutes.

Next, the results of the appearance test of each sample will be described. The criteria for the appearance test are as follows: `` ○ '' if the surface is smooth and there is no fading, discoloration, or fading visually, `` △ '' if the surface is slightly lacking or slightly fading, `` △ '', if the surface is severely uneven or Those with severe discoloration / discoloration / discoloration were marked with "x". Table 3 shows the results.

[0040]

[Table 3]

Considering that when the glass composition of the glass coat layer is the same as the glass flux of the picture layer in the glass B, it is good while the glass composition is as thin as 10 to 15 μm (slightly thicker than a normal overcoat), As the thickness increases, fading or discoloration occurs due to a reaction with paint, or even when the thickness is increased, the composition becomes less fluid due to firing and becomes unsuitable as a product.

The glass composition of the glass coat layer is glass B
In the case of glass having a lower softening point (glass A), the glass coat layer flows or flows out by baking, and further, discoloration, discoloration, and discoloration occur due to reaction with paint, and is not suitable as a product at any thickness.

When the glass composition of the glass coat layer is glass B
For glass with a much higher softening point (glass D),
Although the surface smoothness is slightly inferior to that of glass C at a thickness of 80 to 100 μm, it is adequately suitable for expressing a three-dimensional effect and a lively feeling of a picture.

On the other hand, when the glass composition of the glass coat layer is a glass having a softening point slightly higher than that of glass B (glass C), the glass coat layer having a desired thickness does not flow out, so that the glass coat layer can be obtained as it is, and has an appropriate transparency. It becomes a prosperous material having. Suitability increases as the thickness after firing increases.

[0045]

According to the present invention, a three-dimensional effect can be obtained by printing a transparent glass layer thicker on a thin picture layer (pattern or a different color).

Further, since a stable layer without discoloration or bubbles can be formed even when the glass coat layer on the pattern is thick (super thick), a beautiful three-dimensional appearance of the decorative ceramic and a vibrant finish are achieved. it can.

It is not necessary to thicken and thicken the picture layer (paint layer). A relatively thin or normal thickness picture layer is sufficient, and sufficient multicolor printing can be performed by screen printing. Yes, it is also possible to use transfer paper.

Further, the glass coat layer is almost the same as the lower color pattern layer, and it is not always necessary to clearly separate and overlap the adjacent pattern portion, and the front solid print and a certain degree of overlap are sufficiently allowed. Is done.

Further, since the thickness is thin, that is, the number of times of printing is small, the adjacent colors are not overlapped with each other. Therefore, the interval between the adjacent colors can be narrowed, and a precise and clear picture can be manufactured.

Further, one type of glass coat layer can correspond to paints and pictures of each color.

When the glass coat layer is colorless and transparent,
Even when the glass overlaps with the adjacent picture portion (color portion of the pattern), the colors are mixed and the problem of discoloration or blurring is eliminated, so that a picture with a precise and clear three-dimensional effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically illustrating a fired decorative ceramic according to one embodiment of the present invention.

FIG. 2 is a graph related to measurement of a glass softening point.

[Explanation of symbols]

 1 base layer 2 glaze layer 3 picture layer 4 glass coat layer

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C04B 41/86 C04B 41/86 HA (72) Inventor Hiroshi Hazuki 3-chome Noritakeshinmachi, Nishi-ku, Nagoya-shi, Aichi Prefecture No. 1-36 Noritake Co., Ltd. F-term (Reference) 3B005 EA01 EB01 FA02 FB24 FB25 FC20Y 4F100 AA01B AA01H AG00B AG00C AG00H BA03 CA13B CB01 CC01C DG10A GB90 HB31B JA04C JB09G JL00J

Claims (6)

[Claims] 1. A pattern layer using one or more colors containing an inorganic pigment and a glass flux on a ceramic base layer;
And a glass coat layer formed on the picture material layer or the picture layer, wherein the glass composition constituting the glass coat layer is transparent, and the glass softening point is glass in the paint. 5 to 50 ° C. higher than the glass softening point of the flux, and the thickness of the glass coat layer is 20 to 2 after firing.
A decorative ceramic having a size of 00 μm. 2. A pattern layer using one or more colors of paint containing an inorganic pigment and a glass flux on a glaze layer glazed on the surface of a ceramic substrate layer, and formed on the glaze layer or the pattern layer. In a decorative ceramic having a glass coat layer, the glass composition constituting the glass coat layer is transparent, and its glass softening point is 5 to 50 ° C. higher than the glass softening point of the glass flux in the paint. The thickness of the glass coat layer is 20 to 2 after firing.
A decorative ceramic having a size of 00 μm. 3. The glass coat layer according to claim 1, wherein the thickness after firing is 30 to 150 μm.
Or the decorative porcelain according to 2. 4. The softening point of the glass composition constituting the glass coat layer is higher by 10 to 25 ° C. than the glass softening point of the glass flux in the paint.
The decorative porcelain according to any one of claims 3 to 3. 5. A glass composition constituting said glass coat layer.
The composition ratio of the product is Li₂O: 0-1 wt%, K₂O: 0
1 wt%, Na₂O: 0 to 10 wt%, BaO: 0 to 1
wt%, CaO: 0.1-3 wt%, ZnO: 0.1-
10 wt%, MgO: 0 to 1 wt%, PbO: 30 to 6
0 wt%, Al₂O₃: 0.1 to 10 wt%, Si
O ₂: 20-40 wt%, B₂O₃: 0 to 30 wt%,
P₂O₅: 0 to 1 wt%.
5. The decorative ceramic according to any one of 1 to 4. 6. A transfer paper for painting for painting a ceramic surface, comprising: a water-soluble adhesive layer formed on at least a mount; an inorganic pigment printed at a predetermined position on the adhesive layer; A pattern layer using a paint of one or more colors including a glass frit, and a glass composition having a softening point higher by 5 to 50 ° C. than the glass softening point of the glass flux in the paint on the adhesive layer or the pattern layer. Formed and fired to a thickness of 2
A transparent glass coat layer formed to have a thickness of 0 to 200 μm.