JPH09262942A - Antibacterial decorative sheet and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make resistance against bacteria improve without using a large amount of an antibacterial agent by laminating a pattern layer, the first coat layer which is transparent or translucent, the second coat layer which is transparent or translucent, contains the antibacterial agent, and has a specified thickness in sequence on a backing sheet. SOLUTION: This antibacterial decorative sheet 10 has a pattern layer 18 consisting of a solid print layer 14 and a pattern layer 16 on a backing sheet 12, the first coat layer 20 which is transparent or translucent on the pattern layer 18, and the second coat layer 22 which is transparent or translucent and contains an antibacterial agent on the first coat layer 20. The antibacterial agent contained in the second coat layer 22 is a silver type inorganic antibacterial agent. The fine particles of the antibacterial agent are mixed by a dissolver with a transparent or translucent resin material which constitutes the second coat layer 22, and the mixture is applied on the first coat layer 20. The thickness of the second coat layer 22, as a dry coat, is 3-30% of that of the first coat layer 20.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to Escherichia coli and MRSA.
Regarding a decorative sheet or film having resistance to fungi such as, for example, surface materials for interiors of buildings, vehicles, etc., surface materials for exteriors of furniture, housing equipment, home appliances and various hospitals The present invention relates to a so-called antibacterial decorative sheet or antibacterial film (hereinafter referred to as "antibacterial decorative sheet") suitable for use as a surface material for materials.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Laid-Open No. 6-198707, a paint mixed with an inorganic particulate antibacterial agent containing an antibacterial metal is used as a base material such as plywood, fiber board or thin paper, and thermoplastic. It has been proposed to apply it to the surface of a substrate sheet such as a resin sheet to impart resistance to fungi. In order to protect the surface of the base material or the base material sheet and to give it desired physical properties, it is necessary to apply a coating material having a thickness of 10 μm inside or outside to the surface to form a coat layer, Therefore, to obtain a high antibacterial effect,
It is necessary to mix a large amount of antibacterial agent into the paint.

[0003]

According to the knowledge of the inventors, when an antibacterial agent is mixed in the coat layer, the resistance to fungi depends on the density of the antibacterial agent in the coat layer. However, mixing a large amount of antibacterial agent into the paint not only impairs the economical efficiency of this type of decorative sheet, but also impairs its design. That is, in particular, when the pattern layer is printed on the substrate sheet, the coat layer must be transparent or translucent, but its transparency is impaired by mixing a large amount of the granular antibacterial agent into the paint, Eventually, the design will be impaired. Therefore, an object of the present invention is to increase the resistance of the decorative sheet to fungi without using a large amount of antibacterial agent, and thus without impairing the designability of the decorative sheet.

[0004]

The conventional antibacterial decorative plate exhibits the antibacterial property only in the vicinity of the surface of the coating layer containing the antibacterial agent. Therefore, even if the antibacterial coating layer is thin, the same antibacterial agent is used. If it has a density, it will show almost the same antibacterial properties,
Based on the inventors' finding that increasing the density increases antibacterial properties, the coat layer is divided into two thick and thin layers, most of which are
The basic concept for achieving the object of the present invention is to use a coating layer, that is, a coating layer containing no antibacterial agent, and the rest as a second coating layer, that is, a coating layer containing an antibacterial agent. Therefore, the antibacterial decorative sheet according to the present invention, a pattern layer on the substrate sheet, a transparent or translucent first coat layer on the pattern layer, a transparent or translucent on the first coat layer,
A second coat layer containing an antibacterial agent is included, and the layer thickness of the second coat layer is 3 to 30% of the layer thickness of the first coat layer as a dry film. Further, the method for producing an antibacterial decorative sheet according to the present invention provides a pattern layer by printing on the surface of a base material sheet, applying a transparent or translucent resin material on the pattern layer to form a first coat layer. And providing a second coat layer by coating a transparent or semi-transparent resin material containing an antibacterial agent on the first coat layer, wherein the layer thickness of the second coat layer is a dry coating layer of the first coat layer. It is characterized by being 3 to 30% of the thickness.

[0005]

The protective layer of the decorative sheet is divided into two thick and thin layers, and the antibacterial agent is mixed only in the relatively thin second coat layer forming the surface layer of the protective layer, so that a large amount of antibacterial agent is not used. It is possible to increase resistance to fungi, and thereby an inexpensive antibacterial decorative sheet with high designability can be provided at low cost.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, an antibacterial decorative sheet 10 of the present invention comprises a base sheet 12 and a solid printing layer 14 and a handle layer 1.
6 has a pattern layer 18 composed of 6 and. The pattern layer 18 is not limited to the illustrated example, and may be composed of, for example, a pattern pattern layer of wood grain and a layer of conduit pattern pattern. The antibacterial decorative sheet 10 also has a transparent or semi-transparent first coat layer 20 on the pattern layer 18, and further, a transparent or semi-transparent film on the first coat layer 20.
It has a second coat layer 22 containing an antibacterial agent. Both coat layers 2
The design of the pattern layer 18 can be visually recognized through 0 and 22.

As the base sheet 10, 23 to 50 g / m
² thin paper or inter-paper reinforcing paper, 50-120 g / m ² latex impregnated paper, or polyethylene, polypropylene, polyester, polyvinyl chloride, polyvinylidene chloride, polystyrene, polycarbonate, polyvinyl alcohol, nylon, cellophane or EVA fluorine series A thermoplastic resin film or sheet containing a resin can be used.

The pattern layer 18 can be printed by gravure printing. First coat layer 20 applied on the pattern layer 18 and second coat layer 2 applied on the first coat layer
The transparent or translucent resin material constituting 2 respectively comprises a resin and a solvent, and the resin is a radical polymerization type resin or a thermosetting resin that gives desired properties to the decorative sheet, and the thermosetting resin is phenol. Resins, urea resins, melamine resins, epoxy resins, polyester resins or polyurethane resins.

The antibacterial agent contained in the second coat layer 22 is a silver-based inorganic antibacterial agent. The fine particles of the antibacterial agent are stirred and mixed with a transparent or semitransparent resin material forming the second coat layer 22 by a dissolver and applied onto the first coat layer. The layer thickness of the second coat layer 22 is 3 to 30% of the layer thickness of the first coat layer 20 as a dry film. When the content of the antibacterial agent is constant, the layer thickness is less than 3% or 3
If it exceeds 0%, the design property or antibacterial property may be deteriorated.

Table 1 shows the results of the antibacterial activity test. This test result shows that the "invention product" obtained by carrying out the present invention as follows.
Before and after the test of Escherichia coli and MRSA in a plastic petri dish as a “conventional product” obtained by carrying out the conventional method described above as follows, and a “test product without antibacterial agent” containing no antibacterial agent. It represents a comparison of the numbers (before and after the passage of time). This antibacterial activity test was carried out by the film adhesion method at a storage temperature of 35 ° C. according to the test standard of Japan Food Analysis Center. As a bacterial solution adjusting solution, 1/500 for E. coli and a concentration of 0. Regular broth with 2% meat extract, MRSA
In regard to the above, a normal broth with 1/200 and a concentration of 0.2% meat extract is used.

[Table 1]

First, Table 1 which is an antibacterial decorative board according to the present invention
In the "invention product", a pattern layer is provided by gravure printing on the surface of a substrate sheet made of 30 g / m ² thin paper, and then a urethane resin is applied on the pattern layer using a 110 μ solid plate. A first coat layer is provided, and then a solid plate of 175 l / L is used to apply a urethane resin containing 0.4 parts by weight of an antibacterial agent to the urethane resin of the first coat layer to form a first coat layer. An antibacterial decorative board having two coat layers, the first
The dry coating thickness of the coat layer is 7μ and the dry coating thickness of the second coat layer is 1μ.

Next, the "conventional product" shown in Table 1 which is an antibacterial decorative board by the conventional method is provided with a pattern layer by gravure printing on the surface of a base sheet made of 30 g / m ² thin paper, and then 135 μm. This is an antibacterial decorative plate in which 0.4% by weight of a urethane resin containing an antibacterial agent is applied on the pattern layer using a solid plate to form a protective coat layer, and the dry coat thickness of the protective coat layer is 7.8 μm. Is.

As is apparent from the results of the antibacterial activity test shown in Table 1, the growth of bacteria was observed in the antibacterial agent-free sample containing no antibacterial agent, and the growth of the bacteria was suppressed in the conventional product, but still suppressed. On the other hand, in the product of the present invention, a marked reduction of bacteria (less than 10) is observed, and the antibacterial or bactericidal effect is remarkable.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional view of an antibacterial decorative sheet according to an example of the present invention.

[Explanation of symbols]

 12 Base Material Sheet 18 Design Layer 20 First Coat Layer 22 Second Coat Layer

Claims (5)

[Claims] 1. A pattern layer on a substrate sheet, a transparent or semitransparent first coat layer on the pattern layer, and a transparent or semitransparent second coat layer containing an antibacterial agent on the first coat layer. Including and
The antibacterial decorative sheet, wherein the layer thickness of the second coat layer is 3 to 30% of the layer thickness of the first coat layer as a dry film. 2. A pattern layer is formed by printing on the surface of a substrate sheet, a transparent or semitransparent resin material is applied on the pattern layer to form a first coat layer, and an antibacterial agent is formed on the first coat layer. Coating a transparent or translucent resin material containing an agent to provide the second coat layer, and the layer thickness of the second coat layer is 3 to 30% of the layer thickness of the first coat layer as a dry film. Method for manufacturing antibacterial decorative sheet. 3. The method according to claim 2, wherein the transparent or translucent resin material comprises a resin and a solvent, and the resin is a radical polymerization type resin or a thermosetting resin. 4. The transparent or translucent resin material containing the antibacterial agent comprises a resin, a solvent and an antibacterial agent, the resin being a radical polymerization type resin or a thermosetting resin, and the antibacterial agent being a silver-based inorganic material. The manufacturing method according to claim 2, which is an antibacterial agent. 5. The manufacturing method according to claim 3, wherein the thermosetting resin is a phenol resin, a urea resin, a melamine resin, an epoxy resin, a polyester resin, or a polyurethane resin.