JP2008290348A - Decorative sheet and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decorative sheet excellent in the so-called lustrous feeling that wood inherently possesses and the representation of vessel shapes, having weatherability and free of the problem on interlayer adhesion, and provide its manufacturing method. <P>SOLUTION: The decorative sheet is formed by providing the rear surface side of a transparent or translucent thermoplastic resin sheet with a pattern layer and a hiding solid layer. The thermoplastic resin sheet consists of a transparent or translucent olefinic thermoplastic resin layer that is on the pattern layer side and is added with no UV absorber and a transparent or translucent olefinic thermoplastic resin layer that is on the surface side and is added with a UV absorber. The hiding solid layer comprises 5 pts.wt. of an urethane resin-based polyol and 5 pts.wt. of an isocyanate resin-based curing agent based on 100 pts.wt. of a hiding ink. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a decorative sheet used for building materials and indoor consumer goods materials, and in particular, improves the design while taking advantage of the luster of the wood board, has good ink adhesion on the pattern layer, and is easy to incinerate And a manufacturing method thereof.

  Conventionally, as a decorative plate used as a surface material for interiors and furniture, a veneer decorative plate in which a single wood plate is bonded to the surface of a base material has been widely used. However, in recent years, due to the depletion of natural resources, especially hardwood materials such as persimmon, cherry blossoms, teak, walnuts, etc., these patterns can be applied to substrates such as plywood and MDF (Medium Density Fiber) as an alternative to veneer veneer using these. A decorative board in which a printed decorative sheet is bonded is often used. However, with this method, there is a limit to the expression of the so-called shimmer feeling and conduit shape inherent to the wood.

Therefore, another method is to use softwood material, which is relatively easy to obtain, and southern seawood, which does not worry about resource depletion, as a base material, and melt it onto the surface of a cooling embossing roll that has a convex portion corresponding to a conduit of hardwood material. Extrusion, pressure bonding, cooling and peeling off, printing a wood grain pattern on the back, while applying a transparent or arbitrary colored adhesive on a plate-like substrate made of softwood material, printing the transparent olefin resin wood grain pattern There is a method of forming an arbitrary wood grain pattern by pressure-bonding the side and the adhesive side of the plate-like substrate. According to this method, it was possible to express a tract hole characteristic of hardwood.
However, when a polyolefin resin to which an ultraviolet absorber for imparting weather resistance is added is melt-extruded, the ultraviolet absorber may bleed out and the adhesion of the printing ink for the pattern may be reduced. In addition, there was a problem in the adhesion between the pattern layer and the wooden substrate.

Further, in the conventional manufacturing method, while extruding the molten thermoplastic resin onto a biaxially stretched polyester film (hereinafter referred to as PET film), applying the unevenness and applying the top coat, the PET film is peeled off and discarded. That was a waste. In addition, foreign matter contamination due to static electricity has been a problem at the time of peeling.
Japanese Patent No. 3672636

  The present invention has been made in order to solve such problems, and the object of the present invention is to be excellent in the so-called shimmering feeling and inherent duct shape inherent in wood, weather resistance, and interlayer It is in providing the decorative sheet which does not have the problem of adhesiveness, and its manufacturing method.

  The present invention solves this problem, that is, the invention according to claim 1 is a decorative sheet in which a pattern layer and a concealed solid layer are provided on the back side of a transparent or translucent thermoplastic resin sheet. The thermoplastic resin sheet is a transparent or translucent olefin-based thermoplastic resin layer not added with an ultraviolet absorber on the pattern layer side, and a transparent or translucent layer with an ultraviolet absorber added on the surface side. A decorative sheet comprising an olefinic thermoplastic resin layer, wherein the concealing solid layer comprises 100 parts by weight of concealing ink and 5 parts by weight of a urethane resin polyol and 5 parts by weight of an isocyanate resin curing agent. is there.

  The invention according to claim 2 is a transparent or translucent olefinic thermoplastic resin in a molten state to which an ultraviolet absorber is added, and a transparent or translucent olefinic thermoplastic resin sheet to which no ultraviolet absorber is added. After extruding onto the surface, and simultaneously or immediately after adding the UV absorber to the surface of the transparent or translucent olefin-based thermoplastic resin side with a cooling embossing roll to give an uneven pattern by cooling solidification, A pattern is printed on a transparent or translucent olefinic thermoplastic resin layer to which no UV absorber is added, and 5 parts by weight of urethane resin polyol and 5 parts by weight of isocyanate resin curing agent are added to 100 parts by weight of concealing ink. Is a method for manufacturing a decorative sheet provided with a concealed solid layer comprising a portion.

  According to the first aspect of the present invention, since the polyolefin resin to which no UV absorber is added blocks the UV absorber, the UV absorber bleeds out and the adhesiveness of the printing ink for the pattern is reduced. In addition, since the adhesive layer is made easy to add by adding 5 parts by weight of the urethane resin polyol and 5 parts by weight of the isocyanate resin curing agent to the concealed solid layer, it has an adhesive property to the wood substrate. Therefore, there is no need to provide a primer layer for this purpose, and there is an effect that the adhesiveness with the woody base material is good.

  According to the invention described in claim 2, when a polyolefin resin to which an ultraviolet absorbent for imparting weather resistance is added is melt-extruded into a polyolefin resin to which no ultraviolet absorbent is added, the ultraviolet absorbent is not added. By blocking the ultraviolet absorber with the polyolefin-based resin, there is an effect that the ultraviolet absorber does not bleed out and the adhesion of the printing ink for the pattern is not sweetened. In addition, conventionally, the manufacturing process is simplified, the release film is not required, and there is an effect that foreign matter is not mixed due to generation of static electricity in the manufacturing process.

  Hereinafter, the present invention will be described in detail based on the drawings. FIG. 1 shows a cross-sectional structure of one embodiment of the decorative sheet of the present invention. From the surface, a transparent or translucent olefinic thermoplastic resin layer 1 to which an ultraviolet absorber is added, a transparent or translucent olefinic thermoplastic resin layer 2 to which no ultraviolet absorber is added, a pattern layer 3, and a concealed solid layer 4 It consists of.

As the resin used for the transparent or translucent olefinic thermoplastic resin layer 1 to which an ultraviolet absorber is added, pomopolypropylene, random polypropylene, polyethylene, polyethylene-polypropylene copolymer resin, polymethylpentene resin, or the like can be used.
As the ultraviolet absorber, benzotriazole, triazine, benzoimine, and the like can be used. The addition amount is preferably about 0.1 to 10 parts by weight with respect to 100 parts by weight of the thermoplastic resin.

  As the resin used for the transparent or translucent olefinic thermoplastic resin layer 2 to which no UV absorber is added, a resin that can be used for the transparent or translucent olefinic thermoplastic resin layer 1 to which the UV absorber is added is used. It is possible to use the same resin or a different resin.

  Examples of the pattern layer 3 include a printing ink layer provided by gravure printing or the like, and an ink obtained by adding a pigment or the like to a two-component urethane resin binder (matrix) is preferably used.

  As the concealing solid layer 4, silica, porous silica gel or the like is added to a two-component urethane resin binder (matrix), and a two-component urethane resin, which is easy to achieve an anchoring effect with an aqueous adhesive, is added to a polyvinyl butyral resin or ethylene-vinyl acetate. Resin etc. can be used.

  Extrude a resin with 100 parts by weight of a homopolypropylene resin in a molten state and 5 parts by weight of a benzotriazole-based UV absorber added to a 30 μm thick transparent stretched polypropylene resin sheet to which no UV absorber has been added using an extruder. Then, a cherry tree material, which is a hardwood material, was formed into a sheet with an embossed cooling roll obtained as an original so that the sheet thickness was 100 μm and the emboss depth was 95 μm or less. After that, a wood grain pattern is printed on the non-embossed surface with a two-component urethane resin binder transparent ink, and then the concealment is made by adding 5 parts by weight of urethane resin polyol and 5 parts by weight of isocyanate resin curing agent to 100 parts by weight of concealment ink. The solid layer was printed, and after drying, the sheet was wound up to obtain the decorative sheet of the present invention.

<Comparative Example 1>
The same decorative sheet as in Example 1 was prepared except that the ink of the concealing solid layer of Example 1 was composed only of a two-component urethane resin and a pigment.

<Performance evaluation>
A pine board, which is a softwood material, is used as a base material to which the sheet is attached, and a transparent urethane adhesive is applied to the base material, bonded together, and pressed using a press at 30 to 50 ° C. I got a plate. The resulting decorative board of Example 1 had a design like a hardwood tree with a tract hole while making use of the luster and shine of the pine material of the base material. There was no problem with ink adhesion. However, the decorative board of Comparative Example 1 was peeled off between the ink layer and the wooden substrate.

  The decorative sheet of the present invention can be used as a material for building materials or indoor consumer goods, and can be used particularly for the purpose of improving design while taking advantage of the luster of the wood board.

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 ... Transparent olefin type thermoplastic resin which has not added the ultraviolet absorber 2 ... Transparent olefin type resin which added the ultraviolet absorber 3 ... Pattern pattern layer 4 ... Concealed solid layer

Claims (2)

In a decorative sheet comprising a pattern layer and a concealed solid layer on the back side of a transparent or translucent thermoplastic resin sheet,
The thermoplastic resin sheet is a transparent or semi-transparent olefin-based thermoplastic resin layer to which no ultraviolet absorber is added on the pattern / pattern layer side, and a transparent or translucent olefin to which an ultraviolet absorber is added on the surface side. A thermoplastic resin layer,
The concealing solid layer is composed of 100 parts by weight of concealing ink and 5 parts by weight of urethane resin polyol and 5 parts by weight of isocyanate resin curing agent.   The molten transparent or translucent olefinic thermoplastic resin to which the ultraviolet absorber has been added is extruded onto a transparent or translucent olefinic thermoplastic resin sheet to which no ultraviolet absorber has been added. The surface of the transparent or translucent olefin-based thermoplastic resin side to which the ultraviolet absorber is added is laminated and integrated by cooling and solidifying while providing a concavo-convex pattern with a cooling embossing roll, and then the ultraviolet absorber is not added. A pattern is printed on a transparent or translucent olefinic thermoplastic resin layer, and a concealing solid layer comprising 5 parts by weight of urethane resin polyol and 5 parts by weight of isocyanate resin curing agent is provided on 100 parts by weight of concealing ink. A method for producing a decorative sheet.

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