JPH0621441U - Desk mat - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a desk mat constructed without adding a plasticizer, and to prevent surface scratches and decrease in commercial value. [Structure] A mat body a is formed from ethylene methyl methacrylate into a plate shape of about 2 m / m, and a urethane acrylate-based UV-curable coating material is applied to the surface a ′ (corona treated) of the mat body a, and then the desired UV irradiation is performed with a different UV irradiator to cure and obtain a coating b (film thickness 10 μm).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a desk mat. In the present specification, Chemical formulas 1 to 4 represent the same formula.

[0002]

[Prior art]

 Conventionally, this type of desk mat is constructed by mixing a polyvinyl chloride resin with a plasticizer, a stabilizer, etc., and laying it on a desk or the like for cushioning, writing, or feeling. It is generally used not only by giving it, but also by using a photo, a memo, etc. between the mat and the desk surface.

[0003]

[Problems to be solved by the device]

 However, the plasticizer that was added to the above conventional desk mat bleeds out on the mat surface (inside and outside) as it is used, so if you put copy paper or the like on the desk, The copy paper was sometimes printed on the surface of the mat (especially when it comes to color copy paper). Moreover, when a magnetic card or the like is sandwiched between the plasticizers, the plasticizer migrates to the card, damaging the magnetic part.

The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a desk mat configured without adding a plasticizer. At the same time, it is necessary to prevent surface scratches and reduce the decline in product value.

[0005]

[Means for Solving the Problems]

 The technical means of the present invention to achieve the above object are:

CH ₂ ═CH ₂ , CH ₂ ═CR ₁ COOR ₂ <R ₁ is H and CH ₃ R ₂ is an alkyl group> is an ethylene-based copolymer or a mixture thereof is a main component of the mat body. And forming a UV-curable coating film on the surface of the mat body.

[0006]

【Example】

 Hereinafter, an example of the practice of the desk mat of the present invention will be described. The desk mat A is made of an ethylene-based copolymer obtained by copolymerizing the following chemical formula 3 or a mixture thereof as a main component by a conventionally known extrusion molding, calender molding, or the like. The mat body a is formed into a sheet or film having a desired thickness, and an ultraviolet curable coating film b is provided on the surface of the mat body a for surface treatment (FIGS. 1, 2 and 3). See)

Embedded image _{CH 2 = CH 2, CH 2} = CR 1 COOR 2 <R 1 is H, CH ₃ R ₂ is an alkyl group>

The desk mat A shown in FIG. 1 shows a flat mat body a with a film b simply provided on the surface a ′, and FIG. 2 shows a flat mat body a on the surface a ′. After the coating b is provided, it is shown that the coating is squeezed on the coating b. FIG. 3 shows that the surface a'of the mat main body a which has been squeezed beforehand is provided with the coating b, but only one example is shown. However, the present invention is not limited to the illustrated example. Also, the overall shape is arbitrary such as a rectangular shape in a plane and a circular shape, and can be appropriately changed to any shape commonly called a desk mat.

The ethylene copolymer obtained by copolymerizing the above chemical formula 3 is, for example, ethylene methyl methacrylate, ethylene ethyl acrylate, ethylene methyl acrylate, ethylene butyl methacrylate, ethylene hexyl acrylate, ethylene lauryl methacrylate, ethylene stearyl acrylate. It is composed of ethylene and various acrylic acid esters or various methacrylic acid esters.

The mat body a may be transparent or translucent, and the mat body a may be salicylic acid ester-based or benzophenone so that the color copy paper does not fade when exposed to ultraviolet rays. It is optional to add a UV absorber such as a benzotriazole-based, benzotriazole-based, benzoate-based, or cyanoacrylate-based UV absorber according to various conditions such as the thickness of the mat body a.

The coating b is preferably a urethane acrylate-based UV-curable coating which is excellent in chemical resistance, light resistance, flexibility, etc., and is formed on the surface a ′ of the mat body a by about 5 to 30 μm. .

The desk mat body a can be processed by T-die extrusion, calendering, or the like. For example, the above-mentioned ethylene-based copolymers or a mixture thereof can be formed to a desired thickness by conventional T-die extrusion. The desk mat main body a is formed in a sheet shape, and the surface (coated surface) a ′ of the mat main body a is subjected to corona discharge treatment, and then the urethane acrylate UV curable paint is subjected to the above corona treatment. The surface a'of the above was coated, and then UV was irradiated by a desired UV irradiator to be cured to obtain a coating b, and a desk mat A was constructed.

In addition, in the case of calendering, in order to improve the roll slidability, an acrylic processing aid, an organic acid metal salt, an organic fatty acid alone or a mixture of two or more of these is added to the above resin. . The above-mentioned acrylic processing aid, organic acid metal salt, organic fatty acid, or a mixture of two or more thereof is added in an amount of 0.005 to 10 parts by weight, preferably 0.01 to 3 parts by weight, relative to 100 parts by weight of the resin. It is a department. When the mat body a is formed by calendering, the suitable temperature range is 100 to 220 ° C, preferably 120 to 200 ° C.

Acrylic processing aids include acrylic acid, methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, and other acrylic acid esters, ethyl methacrylate, n-butyl methacrylate. , A group of polymers consisting of copolymers containing methacrylic acid ester such as methacrylic acid-2-ethylhexyl as a main component. Specifically, for example, commercially available Mitsubishi Rayon METABLENE P-700, METABLENE P- 551, Metabrene P-530A, Metabrene L-1000, Kane Ace PA-20, Kane Ace PA-100, Mark LS-3, Mark LS-5 manufactured by Asahi Denka Kogyo.

The organic acid metal salt is a higher fatty acid salt of a metal, such as zinc stearate, zinc laurate, zinc oleate, barium stearate, calcium stearate, dibutyltin laurate, dibutyltin stearate, dibutyltin dilaurate. , Dibutyltin distearate and the like.

The organic fatty acid is, for example, stearic acid, oleic acid, lauric acid, palmitic acid and the like.

In order to impart desired performance to the product regardless of the processing method, a copolymer obtained by copolymerizing the above chemical formula 3 or a mixture thereof is added to the copolymer of ethylene and vinyl acetate as an additive, Mainly composed of polymers and copolymers of ethylene, propylene, butene, butene-1,3-methyl-butene-1, hexene-1, octene-1,4-methyl-pentene-1, etc., such as high-density polyethylene, medium Low-density polyethylene, ultra-low-density polyethylene, crystalline polypropylene, polybutene, etc., and other polyolefins consisting of these mixtures, as well as antistatic agents, UV absorbers, antioxidants, pigments well known in this technical field. It is also possible to add antiblocking agents. In calendering, the above-mentioned acrylic processing aid, organic acid metal salt, organic fatty acid alone or a mixture of two or more thereof as a processing aid is added in an amount of 0.005 to 10 parts by weight per 100 parts by weight of the resin. Parts can be added.

These formulations depend on the copolymer or mixtures thereof, the type and amount of processing aids.

Here, an example of a specific embodiment in the case of calender molding will be described. A mixture of ethylene methyl methacrylate: 100 parts by weight PA-100: 0.5 parts by weight was calendered at a roll temperature of 140 ± 2 ° C. Then, the mat main body a was formed in a plate shape of about 2 m / m by heat lamination. The suitable temperature range in this case is 100 to 220 ° C, preferably 120 to 160 ° C. Then, the surface (coated surface) a'of the mat body a is subjected to corona discharge treatment, and then a urethane acrylate-based UV-curable coating material is applied to the surface a ', and thereafter, by a desired UV irradiator. A desk mat A is formed by curing the film by irradiating it with UV light (120 W / cm × 3 lights) to obtain a coating b (film thickness 10 μm).

[0019]

[Effect of device]

 The invention is

CH ₂ ═CH ₂ , CH ₂ ═CR ₁ COOR ₂ <R ₁ is H, CH ₃ R ₂ is an alkyl group> is formed as an ethylene copolymer or a mixture thereof as a main component. Since the desk mat is composed of the mat body a and the ultraviolet-curable coating film provided on the surface of the mat body a, and the plasticizer such as the conventional desk mat is not added, the desk mat has cushioning properties. , The adverse effect of bleeding out and migration of the plasticizer while imparting writability or texture, that is, the plasticizer bleeding out adheres to the matte surface of the copy paper print, the plasticizer to the magnetic part of the magnetic card, etc. It is possible to provide a desk mat that is easy to use and has no damage to the magnetic part due to the transition of the.

The surface of the mat body that is flexible and easily scratched by the UV-curable coating film becomes tough and hard to be scratched. Therefore, the mat surface is erroneously scratched during transportation or loading and the commercial value is reduced. There is no fear of doing so, and it is very excellent.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a desk mat of the present invention.

FIG. 2 is a perspective view showing an example of another desk mat.

FIG. 3 is a perspective view showing an example of another desk mat.

FIG. 4 is a reference view showing a use state of the desk mat of the present invention.

[Explanation of symbols]

 A: Desk mat a: Mat body a: Surface b: Film

Claims (1)

[Scope of utility model registration request] 1. An ethylene-based copolymer obtained by copolymerizing CH ₂ ═CH ₂ , CH ₂ ═CR ₁ COOR ₂ <R ₁ is H and CH ₃ R ₂ is an alkyl group>, or a mixture thereof. A desk mat, characterized in that a mat body is formed as a main component, and an ultraviolet curable coating film is provided on the surface of the mat body.