JPH03227498A - Moisture-absorbing/releasing decorative sheet - Google Patents

Abstract

PURPOSE:To obtain the title sheet with adequate mechanical strength and high decorativeness by directly providing an air-permeable backing paper with fine uneven patterns made of synthetic resin. CONSTITUTION:The objective sheet having fine uneven patterns 11 made of synthetic resin provided directly on a backing paper 1 with at least part of the recesses 4,4' of said patterns representing the exposed parts 4, which are dispersed throughout the surface of the patterns. It is preferable that the backing paper be imparted, in general, with flame retardancy, 100-160g/m<2> in basis weight and >=90% in the hiding rate expressed by the opacity specified by the JIS-P-8138. The above-mentioned uneven patterns are formed by printing specified patterns using e.g. a synthetic resin-contg. ink followed by heating the patterns to effect setting.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a decorative sheet having moisture absorbing and releasing properties. This invention relates to a decorative sheet that has moisture absorption and release properties.

[Conventional technology]

BACKGROUND ART Various types of decorative sheets have been known for use in, for example, architecture, furniture, vehicles, electrical appliances, etc., in which a fine uneven pattern is applied to the surface of a base material in order to improve the decorative effect.

This concave-convex pattern can be created using various methods, but methods created using foaming ink or non-foaming ink made of synthetic resin have also been widely used.

Such a decorative sheet with a fine uneven pattern formed using foamable or non-foamable ink made of synthetic resin usually uses paper (this paper is generally referred to as "backing paper") as a base material.

As mentioned above, this backing paper is generally provided with flame retardancy because it serves as a base material for decorative sheets for buildings, furniture, vehicles, etc.

Backing paper that has been given flame retardant properties has low strength, discolors easily, lacks texture, and has low workability. It is said that it is extremely difficult to express highly decorative designs due to various restrictions when applying it.

Therefore, prior to applying the above-mentioned uneven pattern to the backing paper which has been given flame retardant properties, it has been conventionally possible to cover the entire surface of the backing paper with the uneven pattern with, for example, polyvinyl chloride resin, etc., to increase the strength of the backing paper. Efforts have been made to improve this, eliminate the tendency for discoloration, and improve workability to express highly decorative designs.

On this coating layer of polyvinyl chloride resin or the like, a foaming ink made of polyvinyl chloride resin containing a foaming agent or a non-foaming ink made of polyvinyl chloride resin or the like that does not contain a foaming agent is used. , a predetermined pattern
is printed thickly and then heated to foam or heat to fix it to create a fine uneven pattern.

[Problem to be solved by the invention]

However, as is well known, the coating layer such as polyvinyl chloride resin provided on the above-mentioned backing paper does not have air permeability or moisture absorption or release properties.

For this reason, when the conventional decorative sheets mentioned above are used as wallpaper or vehicle interior materials, they are not only unable to absorb the moisture inside the room or vehicle, but also cannot be exchanged with fresh outside air. It may cause discomfort to people.

In addition, dew condensation may sometimes occur on the surface of the above-mentioned decorative sheets used as wallpaper, vehicle interior materials, and the like. in this case,
Not only the condensation area but also the area where the condensation has grown and water has flowed down, dust from the interior of the room or the vehicle will adhere, and mold will easily grow, which not only spoils the beauty of the decorative sheet but also causes discomfort. .

In this way, the above-mentioned coating layer, which was conventionally provided for the purpose of improving the strength and processability of the lining paper, preventing discoloration, and imparting texture, has been used to improve the breathability and moisture absorption and release properties of the lining paper. This caused problems such as those mentioned above.

The present invention has been made in consideration of the above points, and has not only breathability but also moisture absorption and release, which are necessary for maintaining beauty, eliminating discomfort, and maintaining human health. An object of the present invention is to provide a decorative sheet made of a synthetic resin and having a fine uneven pattern that also has properties.

[Means to solve the problem]

In order to achieve the above object, the present inventor has made repeated studies and dared to go against common technical knowledge by directly applying a synthetic resin fine uneven pattern to flame-retardant backing paper without providing a coating layer. To obtain a decorative sheet which has not only air permeability but also moisture absorbing and releasing properties (hereinafter referred to as moisture absorbing and releasing properties) of the backing paper, has sufficient strength for practical use, and has high decorative properties. We have discovered that this is possible and have proposed the present invention.

That is, in the present invention, at least a part of the countless minute recesses of the synthetic resin fine uneven pattern directly applied on the backing paper is an exposed part of the backing paper, and the exposed part is the The object of the present invention is to provide a decorative sheet with moisture absorbing and desorbing properties, which is characterized by having a fine uneven pattern scattered over the entire construction surface.

As the backing paper in the present invention, the above-mentioned usual flame-retardant paper can be used.

However, as mentioned above, flame retardant materials have problems with strength, and because they do not have a coating layer, the concealment rate (J
(displayed with opacity as specified in I5-P-8138)
Since it is necessary to have a certain degree of high
The thickness of the paper used as the backing paper for this type of decorative sheet (generally, the basis weight is about 80 g/m", the above JIS
-Thicker (for example, 90g/m in basis weight)
(more than 100 g/m in basis weight, more preferably 100 g/m or more in basis weight, and with a concealment rate of more than 90% as expressed by the opacity specified in J I5-P-8138 above)
It is preferable to use

However, if it is too thick, not only will the above-mentioned poor workability occur, but it will also reduce workability when applying it to walls, furniture, vehicles, etc., so the upper limit is 160 g (7 m) in basis weight.
It is preferable to set it as approximately.

In addition, the synthetic resins that form the fine uneven pattern directly applied to the above-mentioned backing paper include vinyl chloride resin, vinyl acetate resin, vinyl chloride-vinyl acetate copolymer,
Acrylic resin or a mixture of these resins is used.

The fine uneven pattern of the present invention can be produced by, for example, a foaming ink prepared by adding a plasticizer as described below to the above synthetic resin as necessary and blending a foaming agent therein, or a foaming ink that does not contain the foaming agent. As mentioned above, a predetermined pattern is printed using non-foaming ink, and this is heated to foam or fix, resulting in a fine uneven pattern made of foam or non-foam synthetic resin. It is formed.

In the case of the above-mentioned foamable ink, the foaming agent to be contained in the above-mentioned synthetic resin or a mixture of the above-mentioned synthetic resins includes commonly used dinitrosopentamethylenetetramine, N,N'-dimethyl-N , N'-dinitrosoterephthalamide, benzenesulfonyl hydrazide,
p-Toluenesulfonylhydrazide, p,p'-oxybis(benzenesulfonylhydrazide F), 3.3'
-'; Sulfone hydrazide diphenyl sulfone, toluene disulfonyl hydrazide, p-) toluene disulfonyl hydrazide, p, p'-thiobis(benzenesulfonyl hydrazide), toluene disulfonyl hydrazide, p-
Toluenesulfonyl azide, P-toluenesulfonyl semicarbazide, azobisisobutyronitrile, azodicarbonamide, diethyl azodicarboxylate and the like are preferably used.

The content ratio of these foaming agents is appropriately selected depending on the degree of foaming of the foam, but is generally selected within the range of about 1.0 to 6.0 parts by weight per 100 parts by weight of the resin. .

Further, in the case of the above-mentioned foam, in the present invention, it is preferably a so-called open-cell foam in order to improve moisture absorption and desorption properties.

Furthermore, in the present invention, a colorant 2 stabilizer, a plasticizer, a filler, a flame retardant, etc. may be added to the foamed or non-foamed synthetic resin as necessary.

The exposed parts of the backing paper scattered in the recesses of the fine uneven pattern of the synthetic resin construction surface may have various shapes such as circular, triangular, other polygonal, or irregular shapes. , objects of these shapes may be arranged and scattered in a predetermined pattern, or may be scattered randomly.

[Effect]

In the sheet of the present invention, a fine concave-convex pattern made of synthetic resin is formed directly on the backing paper, and at least some of the countless fine concave portions of the fine concave-convex pattern are exposed parts of the backing paper. In addition, since the exposed portions are scattered over the entire surface on which the uneven pattern is applied, the exposed portions of the backing paper exhibit properties unique to paper.

That is, the exposed portions of the paper lining scattered on the surface of the sheet of the present invention exhibit not only air permeability but also moisture absorbing and desorbing properties that are unique to paper, thereby imparting moisture absorbing and desorbing properties to the sheet of the present invention.

In addition, “hygroscopicity” (
In other words, "moisture absorption property" refers to the property of the present invention sheet itself to absorb moisture, and "moisture release property" (in other words, "moisture release property") refers to the property of the present invention sheet due to the moisture absorption property. refers to the property that the moisture contained in the sheet is released from the sheet of the present invention (the direction of release may be any of the front and back sides, the side surfaces, and the top and bottom sides of the sheet of the present invention).

As described above, according to the sheet of the present invention, on the surface having a fine uneven pattern having an excellent design effect,
It maintains aesthetic appearance, eliminates discomfort, and has the properties of breathability and moisture absorption and desorption, which are essential for maintaining human health, which is impossible with the conventional decorative sheets mentioned above. be.

In addition, in the sheet of the present invention, if an open-cell foam is used to form the above-mentioned fine uneven pattern, the continuous cells in the foam exhibit air permeability and moisture absorption/release properties. The air permeability and moisture absorption and release properties of the open-cell foam are added to the air permeability and moisture absorption and release properties of the exposed portion of the lining paper,
- Demonstrates the above-mentioned superior effects.

〔Example〕

A foaming ink of the following composition and a non-foaming ink of the following composition were placed on flame retardant backing paper (commercially available) having the basis weight shown in Table 1 and the hiding rate expressed by the opacity specified in J I 5-P-8138. Using the rotary screen printing method, a predetermined pattern is first printed with non-foaming ink, and then a predetermined pattern different from the above pattern is printed on top of this using foamable ink. After that, 160
The sheet of the present invention is heated to ~240°C to foam the foamable ink and fix the non-foamable ink to form a fine uneven pattern composed of foam (open cell) and non-foamed material. I got it.

In addition, in the present invention, the uneven pattern is not limited to being formed by printing two plates as in this example, but may be formed by further printing in which plates are overlapped.

Further, in the present invention, it is preferable that the basis weight of the ink during each of the above printings is about 5 to 200 g/m''.

Composition of foamable ink; Plasticizer (DOP) 65 parts by weight Stabilizer (
Ba-Zn type) 4.5 parts by weight filler (CaCO:
l) Colorant (titanium oxide) 20 parts by weight 15 parts by weight (product name CR50 manufactured by Ishihara Sangyo Co., Ltd.) Composition of non-foaming ink: Plasticizer (DOP) Stabilizer (Ba-Zn system) Filler (Ca C03) 50 Parts by weight 3 parts by weight 50 parts by weight Thinner (mineral spirit) 10 parts by weight Table 1 The diagram for explaining the structure of the sheet obtained in this example is shown in Figure 1.
As shown in the figure.

In the figure, ■ is the sheet body obtained in this example,
The single sheet has a fine uneven pattern layer 11 made of foam and non-foamed material directly on the backing paper L,
The concavo-convex pattern layer 11 has convex portions 3' made of foam formed on countless convex portions 3 made of non-foamed material, and the convex portions 3.3'
Numerous recesses 4, 4' were formed between them.

Then, it was confirmed that the backing paper 1 was exposed at a portion 4' of the undefeated recesses 4 and 4'.

In addition, in order to confirm the moisture absorption and release properties of the sheet obtained in this example, a non-foaming ink and a foaming ink having the above composition were applied to the above-mentioned backing paper with a basis weight of 110 g/m'', respectively, with the following basis weights. The printed material was tested in the following manner.

■Basic weight of non-foaming ink 90g/m"Basic weight of foaming ink 120g/m"■Basic weight of non-foaming ink 120g/m"Basic weight of foaming ink 120g
/m”■Basic weight of non-foaming ink 90g/m”Basic weight of foaming ink 100g/m”■Basic weight of non-foaming ink 120g/m2Basic weight of foaming ink 1
00g/m”■ Non-foaming ink basis weight 80g/
The basis weight of mz foaming ink is 160g/m" above ■~
Prepare two sheet pieces each of which are cut into 10 cm x 20 cm from the sheet from ■, and paste the backing paper side 1 of each of these two sheet pieces together to expose the uneven patterned surface 11 made of vinyl chloride resin on both sides. For these samples, perform the following (1) to (1) in the order of (1) to (11) below.
The sheets were left in the atmosphere of 1) for 2 hours each, and changes in weight of the sheets were examined.

(1) Leave it in a desiccator (2) Remove from the desiccator and keep at a temperature of 25.5°C.

Leave it in an atmosphere with a humidity of 76% (3) Raise the temperature of the atmosphere in (2) above to 40°C and raise the humidity to 90% and leave it there (4) Then raise the temperature of the atmosphere in (3) above to 23°C. .5℃
, let the humidity drop to 68% (5) leave it in the desiccator again (6) take it out of the desiccator, and leave it at a temperature of 24°C and a humidity of 8%.
(7) Raise the temperature of the atmosphere in (6) above to 40°C and raise the humidity to 90%, and leave it (8) Then raise the temperature of the atmosphere in (7) above to 23°C. , let the humidity drop to 67% and leave it (9) Leave it in a desiccator three times (1O) Remove it from the desiccator and leave it in an atmosphere with a temperature of 24°C and a humidity of 75% (11) The temperature of the atmosphere mentioned above (1O) Table 2 shows the test results for moisture absorption and release after leaving the sample at 40° C. and 90% humidity.

In addition, Table 2 shows the temperature of each sheet from ■ to ■ above: 23°C;
The weight at 67% humidity was set as a standard (0), and the weight was expressed as an increase or decrease from the standard weight.

Comparative Example After forming a coating layer with a basis weight of 120 g/m '' using the non-foaming ink used in Example 1 on the entire surface of the backing paper with a basis weight of 110 g/m '' used in Example 1, On this coating layer, an uneven pattern was formed in exactly the same manner as in Example 1, using the same non-foaming ink and foaming ink as in Example 1 and with the same basis weight as in Example 1 (■).

The decorative sheet obtained in this manner was subjected to a moisture absorption/release property confirmation test in exactly the same manner as in Example 1.

The results are also shown in Table 2.

As is clear from Table 2, all of the sheets ■ to ■ of Example 1 show a large weight change compared to the sheet of Comparative Example, and this weight change is caused by the absorption and release of moisture in each atmosphere. It is determined that this is due to the fact that

In addition, all of the sheets obtained in this example had almost the same strength as conventional decorative sheets provided with a coating layer of polyvinyl chloride resin or the like.

Example 2 A decorative sheet was obtained in the same manner as in Example 1, except that the foam in Example 1 was made of closed cells.

Although the sheet obtained in this example had slightly inferior moisture absorption and desorption properties compared to the sheet obtained in Example 1, it had sufficiently high moisture absorption and desorption properties that no condensation occurred and was highly practical.

[Invention effect]

As described in detail above, according to the decorative sheet of the present invention, a fine uneven pattern made of synthetic resin is formed directly on the backing paper, and among the countless fine concave portions of the fine uneven pattern,
Because some of the exposed parts of the lining paper are exposed and the exposed parts are scattered over the entire surface on which the uneven pattern is applied, the exposed parts of the lining paper have properties unique to paper, such as air permeability and It can exhibit moisture absorption and desorption properties.

As a result, according to the decorative sheet of the present invention, on the surface where a fine uneven pattern having an excellent design effect is applied, the above-mentioned conventional decorative sheet maintains an aesthetic appearance that is unparalleled, eliminates discomfort, and Breathability is necessary for maintaining human health.
It can also have moisture absorption and release properties.

In addition, in the decorative sheet of the present invention, if open-cell foam is used as the synthetic resin constituting the fine uneven pattern, in addition to the air permeability and moisture absorption and desorption properties provided by the exposed parts of the backing paper, Since the air permeability and moisture absorption and release properties of the foam are taken into account, it is possible to obtain excellent air permeability and moisture absorption and release properties.

In addition, in the decorative sheet of the present invention, since the fine uneven pattern is applied directly to the backing paper, it is possible to omit the covering material and the coating process required to cover the conventional backing paper, and the manufacturing process can be omitted. Costs can be significantly reduced, and manufacturing time can also be significantly shortened.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining the cross section of one embodiment of the decorative sheet of the present invention. 1・-・−・−・・Backing paper 3.3′−・Convex portion with a fine uneven pattern 4・−・−・−・−・・Concave portion with a fine uneven pattern 4′−−
--------Recessed portions with a fine uneven pattern and portions IU where the backing paper 1 is exposed: ----------1 Decorative sheet 11 of the present invention
・・−・−−−−1−− Layer with fine unevenness pattern Fig. 1

Claims (1)

[Claims] At least a part of the countless minute recesses of the synthetic resin fine uneven pattern directly applied on the backing paper is an exposed part of the backing paper, and the exposed part is the entire surface on which the fine uneven pattern is applied. A decorative sheet having moisture absorbing and desorbing properties, characterized in that the decorative sheet has moisture absorbing and desorbing properties.