JPH0751346B2 - Decorative sheet - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative sheet in which a decorative layer is formed of particles made of synthetic resin, and in particular, a backing material of the particles made of synthetic resin is required to be exposed on the surface according to demands of design and function. A certain decorative sheet as described above.

[0002]

2. Description of the Related Art Conventionally, construction (ceiling materials, wall materials, floor materials, etc.),
Decorative sheets made of synthetic resin are widely used as surface materials for furniture, vehicles, electric appliances, footwear, bags and the like.

Recently, as such a decorative sheet, particularly as a decorative sheet used as a flooring material, as shown in FIG.
Sheet material made by coating or impregnating synthetic resin on non-woven fabric, woven fabric, knitted fabric, etc. made of glass fiber, synthetic fiber, natural fiber, etc.
Alternatively, synthetic resin particles (chips) 10 are dispersed and fixed on a backing material 1 made of a synthetic resin sheet material or the like, and a minute mosaic pattern is formed by the chips 10 to form a decorative layer 2. Things are being developed.

In addition, the backing material 1 and the synthetic resin chip 10 having conductivity are used, and the decoration sheet having conductivity is used, for example, in an operating room of a hospital or a computer room. Some are used as floor materials and wall materials to prevent electrostatic damage (explosion, dust adhesion, computer malfunctions, etc.).

[0005]

However, due to the recent diversification of lifestyles, there is a demand for diversifying the design of the decorative sheet having the decorative layer 2 having the fine mosaic pattern.

However, since the conventional fine mosaic pattern is formed so as to cover the entire surface of the backing material 1,
A design other than a monotonous mosaic pattern on the entire surface is not possible.

In the case where the decorative sheet having the pattern is a conductive sheet, it is necessary to conduct electricity from the front surface of the mosaic pattern layer 2 to the back surface of the backing material 1. Therefore, the synthetic resin chip 1 located on the surface
It is necessary to mix a conductive material with 0.

Since carbon black has been generally used as the conductive material, this type of conductive decorative sheet has a black gray or black color on the entire surface and the decorative property is completely lost. Had been rejected.

As a measure against this, hitherto, a synthetic resin chip mixed with carbon black and a synthetic resin chip capable of desired coloring using a light-colored conductive material have been mixed together to form the above mosaic pattern. Mosaic pattern using a technique for forming a layer (Japanese Patent Laid-Open No. 63-112777) or a technique in which a surface layer of colored thermoplastic resin containing a light-colored conductive material is formed on the surface of colored synthetic resin particles. Techniques for forming layers have been developed.

In the former case, however, in addition to the need to prepare two types of chips, the conduction from the sheet surface to the backing material is ensured only by the conductive material mixed in the chips. Requires a sophisticated mixing technology (mixing in a completely uniform state is required and strict adjustment of the mixing amount is required), and the sheet manufacturing process is complicated.

In the latter case, it is sufficient to secure the conduction from the sheet surface to the backing material, but there is a concern that the step of forming the surface layer of the synthetic resin particles is added and the manufacturing step becomes complicated.

The present invention has been made in consideration of the above points, and the diversification of the design of a decorative sheet having a minute mosaic pattern composed of synthetic resin chips and the function of a conductive decorative sheet or the like. It is an object of the present invention to provide a decorative sheet that can be improved in a simple process.

[0013]

The decorative sheet of the present invention comprises:
To achieve the above object, synthesized on a backing material having a resin layer, is made of synthetic resin particles is 100~14000g / ^{m 2} spraying fine mosaic pattern of an average particle diameter 0.5~30mm is formed Sheet having a decorative layer
A is characterized by comprising by exposing to the surface through between the synthetic resin particles of synthetic resin forming the synthetic resin layer of the backing material forming the decorative layer.

The backing material having a synthetic resin layer in the decorative sheet of the present invention includes, for example, foamed or non-foamed synthetic resin sheet, glass fiber, organic fiber, pulp, etc.
Non-woven fabric, woven fabric, knitted fabric, etc. made of one or more kinds of materials coated or impregnated with synthetic resin, etc.
A sheet-like material having a semi-transparent or opaque synthetic resin layer formed thereon can be used.

Examples of the synthetic resin which constitutes this synthetic resin sheet or which is applied to or impregnated with a non-woven fabric are polyvinyl chloride, vinyl chloride and ethylene, vinyl acetate, vinyl ether, maleic acid ester, (meth) acrylic acid,
Vinyl chloride resin such as copolymer resin with (meth) acrylic acid ester, acrylonitrile, urethane, etc., acrylic resin, vinyl acetate resin, polyethylene, polypropylene, ethylene-vinyl acetate copolymer resin, urethane resin,
ABS resin, AS resin, polybutylene terephthalate,
Polyethylene terephthalate, 6-nylon, 6,6-
Nylon, polyacetal resin, polysulfone, polyether sulfone, polyphenylene oxide, etc. are mentioned, and these are used individually or in mixture.

Additives such as a plasticizer and, if necessary, a colorant, a filler, a stabilizer, a foaming agent, an antifungal agent, etc. are added to these synthetic resins.

As the plasticizer, dioctyl phthalate,
In addition to general plasticizers usually used for the above synthetic resins such as dibutyl phthalate, butyl benzyl phthalate, dioctyl adipate, diisononyl phthalate, tricresyl diphosphate, DAP, acrylic monomers,
Reactive plasticizers such as acrylic oligomers, tributoxyethyl phosphate, butyldiglycol adipate, Sansocizer C-1100 (New Nippon Rika product name), AM-801B (Sekisui Chemical product name), AM-8
Antistatic plasticizers such as 01A (trade name of Sekisui Chemical Co., Ltd.) and secondary plasticizers such as dodecylbenzene derivatives can also be used.
The amount of the plasticizer added varies depending on the method for preparing the sheet of the present invention described below, but is usually appropriately selected from the range of 10 to 100 parts by weight based on 100 parts by weight of the synthetic resin.

As the colorant, a colorant usually used in this type of sheet is used. The amount of the colorant is appropriately selected depending on the type of the colorant, the desired color development state, and the like.

As the filler, for example, in addition to calcium carbonate, clay, silica, shirasu balloon, glass balloon, wood powder, cork powder, etc. for increasing the amount, silica sand particles, silica particles for the purpose of imparting wear resistance and slip resistance. Acid compound particles, glass powder,
Hard powders such as ground ceramics, carborundum, and alundum, and glass fibers, calcium titanate short fibers, and inorganic short fibers such as MOS (calcium metasilicate) short fibers for the purpose of imparting dimensional stability can be used. The addition amount of these fillers is preferably 1 part by weight or more based on 100 parts by weight of the synthetic resin.

Additives such as the above-mentioned plasticizers, colorants, stabilizers other than fillers, lubricants, foaming agents, antifungal agents, etc. are added in appropriate amounts according to the purpose of use.

As the backing material when the decorative sheet of the present invention is used as a conductive sheet, fibers constituting the above non-woven fabric or the like may be mixed with conductive fibers such as carbon fibers and metal fibers (titanium fibers). Or, the above synthetic resin coated with carbon black powder, carbon fiber, metal fiber (titanium fiber, etc.), glass fiber or other inorganic fiber or organic fiber surface with metal, metal oxide or other conductive substance,
Conductive titanium oxide (titanium oxide surface treated with Sn-Sb compound) powder, powder of metal (silver, copper, nickel, aluminum, stainless steel, iron, etc.) and conductive material such as foil strips were mixed. Things are used. The amount of the conductive material added is appropriately selected according to the desired resistance value, but generally, the powder type is about 2% by weight or more of the above synthetic resin, and the fiber type is about 1% by weight or more. preferable.

In the decorative sheet of the present invention, a conductive sheet may be laminated as a lower layer of the above backing material in order to further reinforce or provide sufficient conductivity. Since this conductive sheet is not exposed on the surface of the decorative sheet of the present invention, a synthetic resin sheet mixed with a conductive material such as carbon black, a nonwoven fabric containing conductive fibers, a woven fabric, a knitted fabric, etc. Is used.

In the decorative sheet of the present invention, as the resin of the synthetic resin particles for forming the fine mosaic pattern layer provided on the above backing material, it is usually used when forming this type of pattern layer. A thermoplastic resin forming a chip can be used. Specifically, the same synthetic resin as the synthetic resin forming the synthetic resin layer of the backing material can be used.

Further, the above thermoplastic resin includes a plasticizer,
If necessary, additives usually used for chips of this kind such as colorants, fillers, conductive materials, stabilizers, lubricants, foaming agents, antifungal agents, etc. are added.

As the plasticizer, the same as the plasticizer used in the synthetic resin forming the synthetic resin layer of the backing material is used, and the addition amount thereof is 100 parts by weight of the thermoplastic resin. It is preferably about 10 to 100 parts by weight.

As the colorant, a colorant usually used in this type of chip is used. The amount of the colorant is appropriately selected depending on the type of the colorant, the desired color development state, and the like. The colorant may be added to the above thermoplastic resin, and the synthetic resin particles themselves in the decorative sheet of the present invention may be colored to form so-called color chips.
It can also be used to color only the surface of synthetic resin particles. Further, a transparent resin layer can be coated on the surface of synthetic resin particles colored with these coloring agents (of course, uncolored synthetic resin particles may be used).

As the filler, the same filler as that added to the synthetic resin forming the synthetic resin layer of the backing material described above can be used, and the addition amount thereof is almost the same as that of the backing material. is there.

When the decorative sheet of the present invention is used as a conductive sheet, a conductive material is added to the above synthetic resin particles for the purpose of imparting conductivity. The conductive material may be the same as the conductive material mixed with the synthetic resin forming the synthetic resin layer of the backing material, but the powder or strip conductive material has an average particle diameter of 0. .5
.About.1000 .mu.m, and a fibrous conductive material having a diameter of 1 to 1000 .mu.m.times.length of 0.1 to 30 mm can be used. The amount of the conductive material added is appropriately selected according to the target resistance value, as in the case of the backing material described above. Generally, the amount of the powdered material is about 2% by weight of the total amount of the synthetic resin particles. %, Preferably about 1% by weight or more in the form of short fibers.

The particle size of the above synthetic resin particles may be the same as that of a normal chip of this type, and specifically, the average particle size is 0.5 to 30 mm . Too big but small
Even if it passes, the synthetic resin layer of the backing material described above is formed.
The synthetic resin does not pass well between the particles and is beautiful and stable.
The decorative sheet of the present invention having a highly detailed micro-mosaic pattern
Will be difficult to obtain. Particularly preferred average particle size is 1
It is ~20mm.

In the decorative sheet of the present invention, the synthetic resin particles are sprayed on the synthetic resin layer of the backing material before or after the synthetic resin forming the synthetic resin layer of the backing material is gelled. Then, it is formed by heating and pressing.

When the synthetic resin particles are sprayed after the synthetic resin layer of the backing material is gelled, the synthetic resin layer of the synthetic resin layer formed on the backing material is used as the synthetic resin during the heating and pressing. It is necessary to use a resin that flows or deforms before forming particles. For example, means such as changing the types of the synthetic resin forming the synthetic resin layer of the backing material and the resin of the synthetic resin particles, or adjusting the addition amount of the plasticizer added to each synthetic resin is adopted. .

As the means for spraying the synthetic resin particles, a vibrating plate, a doctor blade having a notch, a feeder having a supply port intermittently provided, a hopper, a sprayer by a brush roll supply, and an intaglio roll supply. A sprayer, etc. is used. If the amount of spray is too small, it will be beautiful,
And decorative sheet with a variety of minute mosaic patterns
It can not be obtained, and when it is too large amounts Conversely, since the synthetic resin forming the synthetic resin layer of the backing material can not be exposed to the surface of the present invention the decorative sheet, 100~14000g / m
^Set to ² .

Further, as the heating and pressurizing means, an ordinary means used when manufacturing this kind of sheet is adopted. For example, an ordinary embossing device including flat embossing, a press device with a built-in heater, a high frequency induction. A heating / pressurizing device and the like can be mentioned. In particular, it is preferable to use a large-diameter heat roll and press-contact at a contact angle of 10 to 330 °.
At this time, it is of course possible to use a pressure contact roll having a small diameter together. If the pressure contact roll is hard, the synthetic resin of the backing material has a strong tendency to ooze out from the side of these rolls, which deteriorates the quality of the product. It is preferable to use the thing or the thing which wound the rubber sponge etc. In addition, the temperature and pressure at the time of heating and pressing are optimally selected according to the type of synthetic resin of the backing material and the synthetic resin of the particles made of synthetic resin, the means of heating and pressing, and the like.

[0034]

In the decorative sheet of the present invention, the synthetic resin forming the synthetic resin layer of the backing material exudes through the spaces between the synthetic resin particles forming the fine mosaic pattern, and the surface of the decorative sheet of the present invention is exposed. Exposed. At this time, a small mosai
Particles made of synthetic resin that make up
Has a certain amount and is sprayed in a certain amount,
The synthetic resin forming the synthetic resin layer of
When heat and pressure are applied, the particles can easily and reliably pass through the particles and
Light exposed on the surface of the decorative sheet and
It is possible to bring out beautiful and varied mosaic patterns.
Wear.

Therefore, according to the decorative sheet of the present invention, the design of the above mosaic pattern can be varied by the synthetic resin of the exposed synthetic resin layer of the backing material. For example, a synthetic resin for the backing material may be made into a so-called ground, and a design such as expressing a flower, a geometrical pattern, a landscape, or the like in a mosaic shape by using the above-mentioned synthetic resin particles can be applied to this ground.

Further, when the decorative sheet of the present invention is used as a conductive sheet, the synthetic resin layer of the backing material exposed on the surface of the decorative sheet of the present invention is made conductive so that the sheet surface can be changed from the front surface to the back surface. Ensure continuity until reaching. Therefore, the conductive material added to the synthetic resin particles forming the mosaic pattern on the surface of the decorative sheet of the present invention does not need to be completely uniformly mixed, and the addition amount of the conductive material is strictly adjusted. Is not necessary either.

As a result, the manufacturing process of the synthetic resin particles used in the decorative sheet of the present invention, and hence the manufacturing process of the decorative sheet of the present invention, is simplified.

[0038]

EXAMPLES Example 1 (Preparation of Synthetic Resin Particles) The composition shown in Table 1 was heated and stirred by a high-speed stirring blade type mixer (Henschel mixer) to be granulated, and then immediately cooled to obtain colored synthetic resin particles. It was

[0039]

[Table 1] The colored synthetic resin particles obtained as described above were sieved to obtain particles having an average particle size of 2 mm.

(Preparation of sheet of the present invention) A glass fiber mixed non-woven fabric (50 g / m ² ) was coated and impregnated with a vinyl chloride paste having the composition shown in Table 2 in an amount of 500 g / m ² , and the synthetic resin layer 5 was applied onto the non-woven fabric. Before the paste is gelled, the above-mentioned synthetic resin particles are dispersed by a vibrating type sprayer 11
It was sprayed so that the amount was 00 g / m ² .

[0041]

[Table 2]

Then, the contact angle θ = 300 was obtained by the heat roll 3 having a diameter of 0.8 m heated to 165 ° C. and the pressure contact roll 4 having a diameter of 0.1 m and having a surface made of sponge as shown in FIG. The contact pressure was 20000 Kg / m ² for 5 minutes.

The outline of the sheet of the present invention thus obtained is shown in FIG. In FIG. 1, 1 is a backing material,
A decorative layer 2 having a fine mosaic pattern of the colored synthetic resin particles 10 is formed on the backing material 1, and the colored synthetic resin particles forming the mosaic pattern of the decorative layer 2 are formed. The synthetic resin of the synthetic resin layer 5 of the backing material 1 is exposed from between 10.

Example 2 (Preparation of Synthetic Resin Particles) The composition shown in Table 3 was heated and stirred by a high-speed stirring blade type mixer (Henschel mixer), granulated and immediately cooled to obtain colored synthetic resin particles. .

[0045]

[Table 3] The colored synthetic resin particles obtained as described above were sieved to obtain particles having an average particle diameter substantially similar to that of Example 1.

(Preparation of decorative sheet of the present invention) A conductive sheet having a thickness of 1 mm was prepared in advance using a vinyl chloride paste having the composition shown in Table 4.

[0047]

[Table 4]

A vinyl chloride paste having the composition shown in Table 5 was coated on this conductive sheet in an amount of 350 g / m ² , and the conductive synthetic resin particles were vibrated before the paste gelled. The amount was 1100 g / m ^{2 with} a mold sprayer.

[0049]

[Table 5]

Then, using the heat roll 3 and the pressure contact roll 4 shown in FIG. 2 used in Example 1, pressure contact was performed in the same manner as in Example 1 to prepare a conductive sheet of the present invention.

The conductive sheet of the present invention obtained as described above had an excellent electrical conductivity of 10 ⁵ Ω based on the electrostatic safety guidelines of the Industrial Safety Standards Bureau of the Ministry of Labor.

Example 3 (Preparation of Synthetic Resin Particles) The composition shown in Table 6 was heated and stirred with a high-speed stirring impeller mixer (Henschel mixer), granulated, and immediately cooled to obtain colored synthetic resin particles. .

[0053]

[Table 6] The colored synthetic resin particles obtained as described above were sieved to obtain particles having an average particle size of 2 mm.

(Preparation of decorative sheet of the present invention) A conductive sheet having a thickness of 1 mm was prepared in advance using a vinyl chloride paste having the composition shown in Table 7.

[0055]

[Table 7]

On the conductive sheet, the colored synthetic resin particles were applied and sprayed with a doctor blade so that the amount was 1100 g / m ² . Then, this was heated and immediately embossed with a cooled flat embossing roll to prepare a conductive decorative sheet of the present invention.

The electrically conductive sheet of the present invention obtained as described above had an excellent electric conductivity of 10 ⁵ Ω based on the electrostatic safety guideline of the Industrial Safety Standards Bureau of the Ministry of Labor.

[0058]

As described in detail above, according to the decorative sheet of the present invention, the synthetic resin particles forming the fine mosaic pattern have a specific particle size and are dispersed in a specific amount.
Therefore, the synthetic resin layer of the backing material is provided between the particles.
The synthetic resin forming the can be easily and reliably exposed on the surface of the decorative sheet of the present invention, and as a result , the following effects can be obtained.

The synthetic resin forming the synthetic resin layer of the backing material allows the design of the fine mosaic pattern to be varied, so that the decorative sheet of the present invention can be applied to various current lifestyles. The request for diversification of suitable designs can be easily realized.

When the decorative sheet of the present invention is used as a conductive sheet, the synthetic resin forming the synthetic resin layer of the conductive backing material exposed on the surface of the sheet leads from the front surface to the back surface of the sheet. It is possible to reliably secure continuity up to.

Further, the technique of imparting conductivity to the synthetic resin forming the synthetic resin layer of the backing material is easier than the technique of imparting conductivity to the synthetic resin particles,
In addition, in order to secure conduction from the front surface to the back surface of the sheet, compared to the case where it is ensured by particles made of synthetic resin having conductivity, the case where it is ensured by the synthetic resin forming the synthetic resin layer of the backing material. Is easy and certain,
Therefore, according to the decorative sheet of the present invention, it is possible to easily improve the function.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a sheet of the present invention.

FIG. 2 is an explanatory view showing an example of an apparatus used when preparing a sheet of the present invention.

FIG. 3 is an explanatory view showing an example of a conventional decorative sheet having a minute mosaic pattern.

[Explanation of symbols]

 1 Backing Material 2 Decorative Layer 10 Synthetic Resin Particles 5 Synthetic Resin Layer of Backing Material

Claims (1)

[Claims] 1. A backing material having a synthetic resin layer,
Synthetic resin particles having an average particle size of 0.5 to 30 mm are 100 to
A decorative sheet having a decorative layer 14000 g / m ² sparged with fine mosaic pattern is formed, the synthetic resin particles of synthetic resin forming the synthetic resin layer of the backing material forming the decorative layer A decorative sheet that is exposed through the space to the surface.