JP2008114560A - Decorative sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decorative sheet having prolonged anti-weathering property even after exposure in outdoor for a long period of time. <P>SOLUTION: In a decorative sheet comprising at least a thermoplastic resin substrate layer, a decorative layer, a transparent thermoplastic resin layer in this order, the transparent thermoplastic resin surface layer has a light transmittance of 4% or less in an UV ray range of 220-300 nm and is made of an acryl based resin. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a decorative sheet for use in interior and exterior materials of buildings such as houses, construction materials, building materials such as joinery, furniture fixtures, vehicle interiors, housing equipment, furniture products, etc. In particular, the present invention relates to a decorative sheet suitable for surface decoration of a building member that requires weather resistance and heat resistance such as an entrance sliding door.

  A decorative sheet made of a thermoplastic resin such as polypropylene resin or polyethylene terephthalate is excellent in moldability, but there is a problem in the weather resistance of the surface to be used as an exterior, so the transparent thermoplastic resin surface layer Addition of a weathering stabilizer such as an ultraviolet absorber has been suitably performed.

  Usually, what is required as weather resistance is a reduction in light transmittance of 300 to 380 nm, but there is a slight sunlight wavelength region at 300 nm or less, and strong at 300 nm or less when exposed outdoors for a long period of time. The light transmittance in the energy range sometimes becomes a problem.

  Conventionally, the thing which reduced the light transmittance of 300-380 nm by adding various ultraviolet absorbers is known. However, for the above-mentioned strong energy range of 300 nm or less, the light transmittance is reduced in the strong energy range in the case of using a curable resin by heat or ionizing radiation for the resin layer on the surface or pattern layer in the configuration of the decorative sheet. If this occurs, there is a problem that curing is hindered, and cannot be reduced.

On the other hand, as a resin used for the surface layer of the transparent thermoplastic resin, it was considered to use an acrylic resin having excellent weather resistance, but it is expensive, and the light transmittance in the ultraviolet light region of 220 to 300 nm by itself is It was not enough.
JP 2005-96266

  The present invention has been made to solve such problems, and an object of the present invention is to provide a decorative sheet that can have weather resistance even in outdoor exposure over a long period of time.

  The present invention solves this problem, that is, the invention according to claim 1 is a decorative sheet in which at least a thermoplastic resin substrate layer, a picture layer, and a transparent thermoplastic resin surface layer are laminated in this order, The transparent thermoplastic resin surface layer is a decorative sheet characterized in that the light transmittance in the ultraviolet light region of 220 to 300 nm is 4% or less.

  The invention according to claim 2 is the decorative sheet according to claim 1, wherein the transparent thermoplastic resin surface layer is made of an acrylic resin.

  According to the first aspect of the present invention, by making the transmittance of the surface protective resin layer in the ultraviolet light region (220 to 300 nm) 4% or less, a decorative sheet having better weather resistance than the conventional one is obtained. There is an effect that it is possible.

  According to the second aspect of the present invention, it is possible to obtain a decorative sheet having more excellent weather resistance, particularly by using an acrylic resin film for the surface protective resin layer. The acrylic film is stable against light (ultraviolet rays) in terms of the resin structure, and the film itself is also stable against the light deterioration effect. In addition, an ultraviolet absorber can be blended when forming an acrylic film. If the blended film is used as an overlay film as a transparent film, it also has the role of blocking ultraviolet rays and protecting the coated body (understand) from ultraviolet degradation. , Has the effect of.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 shows a cross-sectional structure of one embodiment of the decorative sheet of the present invention. A thermoplastic resin substrate layer 1, a pattern layer 2, and a transparent thermoplastic resin surface layer 3 are laminated in this order.

  The thermoplastic resin substrate layer 1 in the present invention is not particularly limited as long as it is a thermoplastic resin, and polypropylene, polyethylene, polyethylene terephthalate, polyvinyl chloride, and the like can be appropriately used.

  As the pattern layer 2 in the present invention, the ink used for printing may be selected in consideration of the adhesion to the substrate sheet. As the resin system, 2 is formed by adding polyisocyanate to urethane or polyester polyol. Liquid type urethane resin, vinyl chloride resin, mixed system of acrylic resin and polyester resin are generally used. By adding organic, inorganic pigments and dyes to these resins, inks having various hues are prepared.

  Although not shown, an anchor agent layer and an adhesive layer are provided between the pattern layer 2 and the transparent thermoplastic resin surface layer 3 in consideration of the adhesion between the type of pattern ink used and the type of the surface protective resin layer. Is provided as appropriate. As the resin system, a two-component type urethane resin obtained by adding a polyisocyanate to a urethane system or a polyester polyol, a mixed system of a vinyl chloride resin, an acrylic resin and a polyester resin are generally used. Depending on the laminating method, an adhesive resin such as random polypropylene or polyethylene may be used.

  As the transparent thermoplastic resin surface layer 3 in the present invention, a thermoplastic resin having a light transmittance of 4% or less in the ultraviolet region of 220 to 300 nm is used, and is selected in consideration of the adhesion between the pattern ink layer and the adhesive layer. Is done. Specifically, those prepared by adding various ultraviolet absorbers to an olefin resin such as polypropylene or an acrylic resin are selected.

A colored polyolefin resin film having a thickness of 70 μm was used as the thermoplastic resin substrate layer 1, and printing was performed as the pattern layer 2 with urethane ink.
On top of that, a two-component curable urethane resin-based anchor agent is provided with a thickness of 2 μm as an anchor agent layer. -An adhesive resin having an MFR of 8 g / 10 min, to which 30 parts by weight of a propylene copolymer resin has been added, is provided with a thickness of 10 μm, and a triazine ultraviolet absorber (A: Ciba (Specialty Chemicals Co., Ltd.) 2000 ppm is added, and a transparent polypropylene resin film having a thickness of about 80 μm adjusted so that the ultraviolet light transmittance from 220 nm to 300 nm is 4% or less is laminated to obtain the decorative sheet of the present invention. Produced.

  A colored polyolefin resin film having a thickness of 90 μm was used as the thermoplastic resin substrate layer 1, and printing was performed as the pattern layer 2 with urethane ink. Through the anchor layer, a transparent thermoplastic resin surface layer 3 was thermally laminated with a 50 μm thick acrylic film (Sanduren SD014NRT: manufactured by Kaneka Corp.) having an ultraviolet light transmittance of 220 nm to 300 nm adjusted to 4% or less, A decorative sheet of the present invention was produced.

<Comparative Example 1>
A decorative sheet was obtained in the same manner as in Example 1 except that 2000 ppm of a benzotriazole ultraviolet absorber (manufactured by Ciba Specialty Chemicals: “Tinuvin 326”) was added as an ultraviolet absorber. In addition, the ultraviolet light transmittance of 220 nm to 300 nm of the transparent thermoplastic resin surface layer 3 at that time was 15 to 18%.

<Comparative example 2>
A decorative sheet was obtained in the same manner as in Example 2 except that a 50 μm thick acrylic film (Acryprene HBS001: manufactured by Mitsubishi Rayon Co., Ltd.) was used as the transparent thermoplastic resin surface layer 3. In addition, the ultraviolet light transmittance of 220 nm to 300 nm of the transparent thermoplastic resin surface layer 3 at that time was about 10%.

<Evaluation>
About the above sample, the decorative board was produced by bonding together on the surface of the steel plate base material through an adhesive, and the weather resistance was tested using a metal weather. The results are shown in Tables 1 and 2.

  The decorative sheet of the present invention can be used as a decorative sheet suitable for surface decoration of a building member that requires weather resistance and heat resistance such as an entrance sliding door.

It is explanatory drawing which shows the structure of the cross section of one Example of the decorative sheet of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Thermoplastic resin base material layer 2 ... Picture layer 3 ... Transparent thermoplastic resin surface layer

Claims (2)

  In a decorative sheet in which at least a thermoplastic resin base layer, a pattern layer, and a transparent thermoplastic resin surface layer are laminated in this order, the transparent thermoplastic resin surface layer has a light transmittance of 4 in the ultraviolet region of 220 to 300 nm. A decorative sheet characterized in that it is not more than%. The decorative sheet according to claim 1, wherein the surface layer of the transparent thermoplastic resin is made of an acrylic resin.