JPH03241097A - Decorative sheet having moisture absorption and desorption properties - Google Patents

Abstract

PURPOSE:To provide the subject decorative sheet having a thin synthetic resin coating layer on a rag lining, containing layers having an infinite number of finely indented patterns on the above mentioned coating layer, having air- permeability and moisture absorption and desorption properties and suitable for buildings, furnishings, cars, electric apparatuses, etc. CONSTITUTION:An objective sheet having a synthetic resin coating layer 2 having <=50mum thickness on a rag lining 1 and containing layers 4 and 3 having an infinite number of finely indented patterns on the above-mentioned coating layer 2.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a decorative sheet having moisture absorbing and releasing properties (that is, moisture absorbing and releasing properties), and specifically relates to a decorative sheet having a fine uneven pattern made of synthetic resin. The present invention relates to a decorative sheet having moisture absorbing and releasing properties.

[Conventional technology]

BACKGROUND ART Conventionally, decorative sheets used for, for example, architecture, furniture, vehicles, electrical appliances, etc., have been loaded and unloaded with fine irregularities patterned on the surface of the 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 used as a base material for decorative sheets for buildings, furniture, vehicles, etc., so flame retardancy is added to -g.

Backing paper that has been given flame retardant properties has low strength, discolors easily, lacks texture, and has low workability, so it is necessary to create fine uneven patterns using foaming and non-foaming inks made of synthetic resin. Due to various restrictions, it is said to be extremely difficult to express highly decorative designs.

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 is not only breathable but also has no 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 workability of the lining paper, preventing discoloration, and imparting texture, has been found to reduce the breathability and moisture absorption and desorption properties of the lining paper. This caused the problems mentioned above.

The present invention has been made in consideration of the above points, and has not only breathability but also moisture absorption and desorption properties, 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 synthetic resin and having a fine uneven pattern.

[Means to solve the problem]

As a result of repeated studies in order to achieve the above object, the inventors of the present invention discovered that the thickness of the coating layer provided on the flame-retardant backing paper and the thickness of the convex portions of the uneven pattern can improve ventilation. The present inventors have discovered that the degree of moisture absorption and moisture absorption and release are affected, and have proposed the present invention.

That is, the present invention has the following features: (1) A coating layer made of synthetic resin with a thickness of 50 μm or less is provided on the backing paper, and on the coating layer there are countless fine uneven patterns made of a synthetic resin of the same type or different type from the synthetic resin. (2) at least a portion of the countless fine concave portions of a fine concavo-convex pattern made of synthetic resin directly applied on the N-shaped paper; The gist of the present invention is a decorative sheet with moisture absorbing and releasing properties, which is formed on a backing paper to a thickness of 50 μm or less.

The backing paper used in the present invention is a normal paper with flame retardancy as described above, that is, a basis weight of about 80 g/m'', J
The opacity specified by IS-P-8138 is used, and the concealment rate is about 90%, but in the present invention, the basis weight is about 90 to 160 g/m2, and
The concealment rate displayed at the opacity specified in 38 is 90 ~
A range of about 95% is preferably used.

In addition, in the present invention, the lower limit of the basis weight is set at about 90 g/m2 because if it is thinner than this, the product will have poor texture and lack practicality, and the upper limit is set at about 160 g/m2 because if it is thicker than this, This is because not only the above-mentioned poor workability appears, but also the workability when applying it to walls, furniture, vehicles, etc.

In addition, the synthetic resins used for the coating layer provided on the above-mentioned backing paper include vinyl chloride resin, vinyl acetate resin,
Examples include vinyl chloride-vinyl acetate copolymers, acrylic resins, and mixtures of these resins.

The thickness of the coating layer is 50 μm or less, but depending on the coating device, it may not be possible to make it extremely thin, and in this case, the lower limit is about 10 μm.

As the synthetic resin constituting the countless fine uneven patterns applied directly onto this covering layer or on the backing paper, the same synthetic resins as the above-mentioned synthetic resins used for the covering layer are preferably used. Even if the combination of the synthetic resin forming the fine uneven pattern and the synthetic resin forming the coating layer are of the same type,
It may be of different species.

In the present invention, for example, a foaming ink is prepared by adding a plasticizer as described below to the above synthetic resin as needed, and a foaming agent is blended with the ink, or a non-foaming ink that is not blended with the foaming agent. As mentioned above, a predetermined pattern is printed using ink, and this is heated to foam or fix, forming a fine uneven pattern made of foam or non-foam synthetic resin. .

In the present invention, there are two types of fine uneven patterns: one is formed on the above-mentioned coating layer, and the other is formed directly on the backing paper.

In the case of the former coating applied on the coating layer, at least a part of the countless minute recesses of the fine uneven pattern are exposed parts of the coating layer, or when the coating layer is not exposed. Even if the sum of the thickness of the covering layer and the thickness of the recess on the covering layer is 5
It is configured so that it does not exceed 0 μm.

In the latter method, which is applied directly onto the backing paper, at least a portion of the countless fine concave portions with a fine uneven pattern are formed on the backing paper to a thickness of 50 μm or less.

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-1-ruenesulfonylhydrazide, p,p'-oxybis(benzenesulfonylhydrazide), 3.3'
-Disulfone hydrazide diphenyl sulfone, toluene disulfonyl hydrazide, p-toluene disulfonyl hydrazide, p,p'-thiobis(henzenesulfonyl hydrazide), toluene disulfonyl hydrazine, ρ-toluenesulfonyl azide, p-toluenesulfonyl semicarbazide, azobisiso Butyronitrile, 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.

To obtain this open-celled material, for example, JP-A No. 62
The technique found in Japanese Patent No.-231740 can be adopted.

Furthermore, in the present invention, colorants, stabilizers, plasticizers, fillers, flame retardants, etc. may be added to the foamed or non-foamed synthetic resin as required.

[Effect]

In the sheet of the present invention, the thickness of the synthetic resin coating layer provided on the backing paper is 50 μm or less, or at least some of the countless recesses with a fine uneven pattern provided directly on the backing paper are 50 μm or less thick on the backing paper. With the following thickness, the coating layer or the recesses themselves having a thickness of 50 μm or less are not only breathable but also have moisture absorbing and releasing properties, thereby imparting moisture absorbing and releasing properties to the sheet of the present invention.

That is, the above-mentioned extremely thin coating layer showing moisture absorption and desorption properties
The four portions having a thickness of 0 μm or less are present in some of the concave portions of the countless fine concavo-convex patterns of the sheet of the present invention. Such recesses appear in various shapes such as circles, triangles, other polygons, or irregular shapes, and are scattered in a predetermined pattern or randomly over the entire surface where the fine unevenness pattern is applied. The ultra-thin recesses, which appear in various shapes and in various scattered manners, exhibit air permeability and moisture absorption and desorption properties, thereby imparting moisture absorption and desorption properties to the sheet of the present invention.

As described above, the sheet of the present invention maintains the aesthetic appearance, eliminates discomfort, and has the breathability and moisture absorption and desorption properties that are essential for maintaining human health, which were impossible with the conventional decorative sheets mentioned above. It has the function of being able to also have the following functions.

In addition, in the sheet of the present invention, if an open-cell foam is used as the synthetic resin constituting the fine uneven pattern, the continuous cells in the open-cell foam will have air permeability and moisture absorption and desorption properties. In order to exhibit this, 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 ultra-thin recesses themselves, and the above-mentioned effect that is superior to that of the above layer is achieved.

In addition, "hygroscopicity" (in other words, "moisture absorption") of the moisture absorption and release properties of the present invention sheet refers to the property of the present invention sheet itself to absorb moisture; "Moisture release property") means that the moisture contained in the sheet of the present invention is released from the sheet of the present invention due to the hygroscopic property (the direction of release is from the front and back sides, the side surfaces, and the top and bottom sides of the sheet of the present invention). direction) refers to the nature of the action.

〔Example〕

On a flame-retardant backing paper (commercially available) with a basis weight of 80 g/m2 and a hiding rate of 90% as expressed by the opacity specified in JIS-P-8138, a resin compound with the following composition was used to make a thick layer. A coating layer with a thickness of 50 μm was provided, and a predetermined pattern (pattern) was first printed on the coating layer using the non-foaming ink using a foaming ink and a non-foaming ink having the following compositions using a rotary screen printing method. After printing a predetermined pattern different from the above pattern with foaming ink on top of this, heating is performed at 160 to 240°C to foam the foaming ink and fix the non-foaming ink. A sheet of the present invention was obtained by forming a fine uneven pattern composed of a foam (open cell) and a non-foamed material.

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.

In addition, the amount of ink per unit area for each printing mentioned above is 5 to 200g.
/m" is preferable.

Composition of the resin formulation: Plasticizer (DOP) Stabilizer (B a -Zn system) Filler (CaCO+) Colorant (titanium oxide) Thinner (composition of mineral foam foaming ink: Plasticizer (DOP) Stabilizer (Ba-Zn system) Filler (CaCO3) 50 parts by weight 3 parts by weight 50 parts by weight 20 parts by weight 10 parts by weight 65 parts by weight 4.5 parts by weight 20 parts by weight Colorant (titanium oxide) 15 parts by weight Composition of non-foaming ink: Use the same composition as the resin formulation above.

The sheets obtained in this example all had cross sections as shown in FIG.

In the figure, a coating layer 2 with a thickness of 45 to 50 μm is provided on a backing paper 1, and a fine uneven pattern layer 11 made of a foamed material and a non-foamed material is formed on the coating layer 2. There is.

This fine unevenness pattern layer 11 is formed of numerous protrusions 3 made of a non-foamed material and protrusions 3' made of a foamed material.
, 3', numerous four parts 4.4' were formed.

It was confirmed that the very thin coating layer 2 described above was exposed at part 4' of the countless four parts 4 and 4'.

In addition, in order to confirm the moisture absorption and desorption properties of the sheet obtained in this example, non-foaming ink and foaming ink were applied to the above-mentioned backing paper provided with the above-mentioned coating layer in the following weights. The printed material was tested in the following manner.

■Basic weight of non-foaming ink 90g/m2Basic weight of foaming ink 120g/m2■Date weight of non-foaming ink 120g/m2Basic weight of foaming ink 120g
/m2 ■Non-foaming ink date M 90 g/m2
Fabric weight of foaming ink: 100g/m2 Two sheet pieces each made by cutting the sheets from ■ to ■ above into 10cm x 20cm.
Prepare two sheet pieces and paste the backing paper sides of each of these two sheet pieces together to expose the uneven patterned surface made of vinyl chloride resin on both sides. The sheets were left in the atmospheres (1) to (11) for 2 hours each, and changes in weight of the sheets were examined.

(1) Leave it in a desiccator (2) Remove it from the desiccator and leave it in an atmosphere with a temperature of 25.5°C and 76% humidity (3) Set the temperature of the atmosphere in (2) above to 40°C and humidity to 90%. (4) Then, the temperature of the atmosphere in (3) above was increased to 23.5'
C-? Lower the W degree to 68% and leave it (5) Leave it in the desiccator again (6) Take it out of the desiccator and leave it in an atmosphere with a temperature of 24°C and 83% humidity (7) Adjust the temperature of the atmosphere in (6) above. Raise the temperature 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°C1.
Lower the humidity to 67% and leave it (9) Leave it in a desiccator three times (10) Take it out of the desiccator and leave it in an atmosphere with a temperature of 24°C and 75% humidity (11) Reduce the temperature of the atmosphere (lO) above. Table 1 shows the test results for moisture absorption and desorption after being left at 40° C. and 90% humidity.

In addition, Table 1 shows the temperature of each sheet from ■ to ■ above, 23"C.
, the weight under 67% humidity was set as the reference (0), and the weight was expressed as an increase or decrease from the reference weight.

As is clear from Table 1, all of the above sheets ■ to ■ show large weight changes, and this weight change is attributed to absorbing and releasing moisture in each atmosphere. be judged.

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.

Example 3 A decorative sheet was obtained in the same manner as in Example 1, except that the coating layer of Example 1 was removed and the printing pattern was changed.

The sheet obtained in this example had a structure roughly as shown in FIG. 2, with numerous recesses 4.41 formed between projections 3.3'.

When the thickness of the recesses 4, 41 was measured at several dozen locations, approximately 90 recesses 41 were found to have a thickness in the range of 30 to 50 μm.
It accounted for %.

The sheet obtained in this example had almost the same moisture absorbing and releasing properties as the sheet obtained in Example 1.

〔Effect of the invention〕

As detailed above, according to the decorative sheet of the present invention, some of the recesses in the synthetic resin coating layer or fine uneven pattern provided on the backing paper are made extremely thin with a thickness of 50 μm or less. Since the coating layer or the recesses themselves have breathability and moisture absorption/desorption properties, it maintains the aesthetic appearance, eliminates discomfort, and maintains human health, which is impossible with the conventional decorative sheets mentioned above. It can exhibit excellent breathability and moisture absorption and desorption properties.

In addition, in the decorative sheet of the present invention, if an open-cell foam is used as the synthetic resin forming the fine uneven pattern, the air permeability and moisture absorption/desorption properties of the open-cell foam will be added. Therefore, it is possible to obtain excellent breathability and moisture absorption/desorption properties.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a cross section of one embodiment of the decorative sheet of the present invention, and FIG. 2 is an explanatory diagram showing a cross section of another embodiment of the decorative sheet of the present invention. l Lining paper 2 Covering layer 3.3' Convex portion with a fine uneven pattern 4' 1 1 Concave portion with a fine uneven pattern Concave portion with a fine uneven pattern, where the coating layer 2 is exposed Fine uneven pattern Layer 4 soil with a fine uneven pattern in the concave part with a thickness of 50 μm or less

Claims (2)

[Claims] (1) A coating layer made of synthetic resin with a thickness of 50 μm or less is provided on the backing paper, and on the coating layer there is a countless fine uneven pattern layer made of the same or different type of synthetic resin as the synthetic resin. A decorative sheet with moisture absorption and desorption properties. (2) At least a part of the countless fine concave portions of the synthetic resin minute concavo-convex pattern directly applied to the backing paper are formed on the backing paper with a thickness of 50 μm or less. Decorative sheet with moisture absorption and desorption properties.