JP2011046032A - Decorative sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decorative sheet which has a satin-finish-like irregularity pattern on its surface and has excellent antifouling properties, e.g. wipability of magic markers, and excellent scratch resistance. <P>SOLUTION: The decorative sheet has a satin-finish-like irregularity pattern in the front surface of a transparent thermoplastic resin layer and a surface protective layer containing a silicone. The difference of elevation of the irregularity of the surface after formation of the surface protective layer is 20 μm or smaller; the angle of the irregular pattern of the surface to the horizontal surface after formation of the surface protective layer is 15 degree or smaller; and the arithmetical mean roughness Ra of the surface after formation of the protective layer is 3-4 μm. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a decorative sheet having a satin-like concavo-convex pattern on the surface, and in particular, a surface protective layer containing silicone is provided on the surface, and has design properties by setting the design of the satin-like concavo-convex. However, the present invention relates to a decorative sheet that can easily remove magic ink stains by dry wiping and is not easily damaged.

  2. Description of the Related Art Conventionally, a decorative sheet is known in which a pattern provided between a transparent resin layer and a substrate is provided with depth and texture by providing irregularities on the surface of the transparent resin layer. However, due to the unevenness of the surface, there was a problem in stain resistance such that it was difficult to wipe the surface after drawing with magic ink.

In order to improve this, it was considered that the surface protective layer contains silicone. However, if silicone is added too much, the surface is inferior in scratch resistance.
Japanese Patent No. 3900622 Japanese Patent No. 4265226

  The present invention has been made to solve this problem, that is, the subject is a decorative sheet having a satin-like uneven pattern on the surface, and is resistant to contamination such as wiping of magic ink. An object of the present invention is to provide a decorative sheet that is excellent in surface resistance and scratch resistance.

  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 transparent thermoplastic resin layer are provided in this order on a base material, and the transparent sheet It is a decorative sheet provided with a satin-like uneven pattern on the surface side of the tree thermoplastic resin layer and a surface protective layer containing silicone, and the height difference of the surface unevenness after providing the surface protective layer is 20 μm The angle from the horizontal surface of the surface after providing the surface protective layer to the concavo-convex pattern is 15 degrees or less, and the arithmetic average roughness Ra of the surface after providing the surface protective layer is 3 to 4 μm. It is a decorative sheet characterized by being.

  The invention according to claim 2 is the decorative sheet according to claim 1, wherein the surface protective layer contains 2% to 9% of silicone with respect to 100 parts by weight of the urethane resin. .

  According to the first aspect of the present invention, by limiting the surface shape of the satin-like embossing, there is an effect that a decorative sheet excellent in both surface contamination resistance and scratch resistance can be obtained.

  According to the second aspect of the present invention, there is an effect that a decorative sheet that is further excellent in both surface contamination resistance and scratch resistance can be obtained by limiting the amount of silicone added.

It is explanatory drawing which shows the shape of the cross section of one Example of the decorative sheet of this invention. It is explanatory drawing which shows the shape of the cross section of the textured uneven | corrugated pattern of one Example of the decorative sheet of this invention.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 shows the cross-sectional shape of one embodiment of the decorative sheet of the present invention. A pattern layer 2, a transparent thermoplastic resin layer 3, and a surface protective layer 4 are provided on the substrate 1 in this order, and a satin-like uneven pattern 5 is provided on the surface. An adhesive layer (not shown) for improving interlayer adhesion may be provided as appropriate between the layers.

  As the substrate 1 in the present invention, a polyvinyl chloride resin or the like may be used, but considering incineration at the time of disposal, for example, a polyolefin resin, a polyester resin, a polystyrene resin, an acrylic resin, etc. It is desirable to use a non-halogen thermoplastic resin. Of these, polyolefin resins such as polypropylene and polyethylene are most preferred because they are excellent in terms of economy, workability, mechanical strength, impact resistance, solvent resistance, and the like.

  As the pattern layer 2 in the present invention, it is provided for imparting a desired design to the surface, and its constituent material and formation method are not particularly limited. The most common is gravure printing, which allows continuous high-speed printing. The pattern is arbitrary as desired, for example, a wood grain pattern such as an oak pattern or birch pattern inspired by a wooden flooring material, a stone pattern inspired by marble or granite, or other abstract patterns.

  What is necessary is just to select the ink used for printing of the pattern pattern layer 2 in consideration of adhesiveness with the base material 1. For example, for base materials made of polyolefin resin, one-pack type urethane resin from the cohesive strength of ink, two-pack type urethane resin that disperses pigment in polyester polyol, blends polyisocyanate and cures, etc. Is common. Moreover, when a base material consists of a polyester-type resin, the mixed system etc. of an acrylic resin and a polyester resin are mentioned.

  The pigment used for coloring the ink needs to be designed in consideration of weather resistance, and it is desirable to use an inorganic pigment, a condensed polycyclic pigment, or a phthalocyanine pigment. For example, isoindolinone pigments as yellow pigments, quinacridone pigments as red pigments, phthalocyanine pigments as indigo pigments, carbon black as black pigments, and titanium dioxide as white pigments are preferably used. it can.

  As the transparent thermoplastic resin layer 3 in the present invention, a polyvinyl chloride resin or the like may be used, but in consideration of incineration at the time of disposal, for example, polyolefin resin, polyester resin, polystyrene resin, acrylic resin, etc. It is desirable to use a non-halogen thermoplastic resin such as a resin. Of these, polyolefin resins such as polypropylene and polyethylene are most preferred because they are excellent in terms of economy, workability, mechanical strength, impact resistance, solvent resistance, and the like.

  The substrate 1 and the transparent thermoplastic resin layer 3 can be laminated by an adhesive method using an adhesive layer made of an appropriate adhesive such as an adhesive for dry lamination, or by pressing the two at a high temperature and partially at the interface. Any conventionally known arbitrary method such as a heat-sealing method in which a thermoplastic resin for forming the transparent thermoplastic resin layer 3 is melted and extruded, and the thermoplastic resin is extruded by heating and extruding at the same time is laminated. Techniques can be used.

  The textured uneven pattern 5 in the present invention can be provided by embossing the surface of the transparent thermoplastic resin layer 3. As a method for forming embossing, there is a roll embossing method in which a heated sheet is passed between an embossing roll in which a concavo-convex shape obtained by inverting the embossing shape to be formed is formed on a cylindrical surface of a cylindrical plate material and a pressure roll such as a hard rubber roll. Most commonly, when the transparent thermoplastic resin layer 3 is laminated on the substrate 1 by the above-described extrusion lamination method, the resin melt-extruded during the lamination is placed between the embossing roll and the substrate 1. Therefore, it is possible to use an extrusion lamination simultaneous embossing method in which embossing is formed simultaneously with the lamination of the transparent thermoplastic resin layer 3. These are methods premised on long continuous processing. However, as long as they are expressed by single wafers, they may be embossed by a flat pressure pressing method using a flat embossed plate.

  As the surface protective layer 4 in the present invention, a layer containing silicone is used. Examples of the resin containing silicone include a two-component curable resin, a thermosetting resin, and an ionizing radiation curable resin. In particular, an acrylic polyol compound, an organopolysiloxane alkylol compound having a hydroxyl group at the terminal, It is mixed with an isocyanate compound, and between the hydroxyl groups of the acrylic polyol compound is cross-linked through the polyisocyanate compound and cured, and at the same time, a part of the hydroxyl groups of the acrylic polyol compound is organopolysiloxane alkylol compound through the polyisocyanate compound. Of the acrylic polyol compound in which a carboxyl group is introduced into the side chain by adding an unsaturated carboxylic acid such as acrylic acid or methacrylic acid as a copolymerization component, and a hydroxyl group at the end Olga with A silicone-modified acrylic polyol compound obtained by bonding the hydroxyl group of a polysiloxane alkylol compound by an esterification reaction, a silicone-modified acrylic polyol compound having an organopolysiloxy group introduced into the side chain, and a polyisocyanate compound are mixed. Two types of those obtained by crosslinking between the hydroxyl groups of the polyol compound via a polyisocyanate compound are preferable.

  As a method for adding silicone, the surface protective layer 4 having stain resistance can be prepared by adding silicone oil to a urethane-based resin and causing it to bleed on the surface. Further, the surface protective layer 4 can also be prepared by introducing an organopolysiloxane group into the side chain of the acrylic polyol used for molding the urethane resin and crosslinking it with a polyisocyanate compound to form a silicone-modified acrylic urethane layer. Can be created.

  The addition amount of the silicone is preferably 2% to 9% with respect to 100 parts by weight of the urethane resin. If it is less than 2%, magic wiping is difficult, and if it exceeds 9%, there is a problem in compatibility with the urethane resin. Moreover, it is a limit which puts silicone in a urethane resin, and when silicone is put too much, the toughness (scratch resistance etc.) which is originally covered with the urethane resin part required for a surface protective layer will fall.

  FIG. 2 shows a cross-sectional shape of a satin-like uneven pattern according to an embodiment of the decorative sheet of the present invention. In the satin-like uneven pattern 5 in the present invention, the unevenness of the surface unevenness after providing the surface protective layer 4 is 20 μm or less, and the uneven pattern is formed from the horizontal surface of the surface after providing the surface protective layer. The reaching angle is 15 degrees or less, and the arithmetic average roughness Ra of the surface after providing the surface protective layer is 3 to 4 μm.

  If there are places where the uneven height difference exceeds 20 μm, it becomes difficult to wipe off dirt such as magic ink that has entered the recesses. Further, if the concavo-convex pattern exceeds 15 degrees from the horizontal surface of the surface, it becomes difficult to wipe off dirt along the horizontal surface. And, when the arithmetic average roughness Ra is in the range of 3 to 4 μm, it becomes suitable as a satin-like unevenness in which the pattern has a depth and texture.

  A colored polyolefin film having a thickness of 70 μm is used as the base material 1, and a two-part curable urethane resin gravure ink is used on this with a stone pattern patterned layer 2 and a two-part curable polyester urethane adhesive. Then, a transparent polyolefin resin having a thickness of 80 μm as the transparent thermoplastic resin layer 3 was laminated by coextrusion, and a textured uneven pattern 5 was applied to the surface simultaneously with the extrusion.

  Thereafter, after applying the satin-like uneven pattern 5 of the transparent thermoplastic resin layer 3, a gravure coat is applied with a coating liquid containing 100 parts by weight of acrylic polyol, 5 parts by weight of isocyanate curing agent, and 3 parts by weight of silicone oil. The surface protective layer 4 is formed by coating so that the coating amount after drying is 3.0 g / m 2, the uneven height difference is 20 μm or less, the uneven angle is a maximum of 15 degrees or less, and the arithmetic average roughness of the uneven surface A decorative sheet having Ra = 3 to 4 μm was obtained. In addition, the measuring method of arithmetic mean roughness was calculated | required based on the specification of JISB0601: 2001 using the stylus type surface roughness meter using the needle | tip with a 2Rmicrometer tip.

<Comparative Example 1>
A decorative sheet was obtained in the same manner as in Example 1 except that the arithmetic average roughness was changed to 5.5 μm.

<Comparative Example 2>
A decorative sheet was obtained in the same manner as in Example 1 except that the arithmetic average roughness was 2.5 μm.

<Comparative Example 3>
A decorative sheet was obtained in the same manner as in Example 1 except that the unevenness height difference was 10 μm and the center line average roughness was 2.0 μm.

<Comparative example 4>
A decorative sheet was obtained in the same manner as in Example 1 except that the unevenness height difference was 30 μm and the center line average roughness was 8.0 μm.

<Comparative Example 5>
A decorative sheet was obtained in the same manner as in Example 1 except that the unevenness angle was 30 degrees or less at the maximum.

<Performance evaluation method>
A magic wiping test was conducted as an evaluation of wiping performance of magic. A line having a width of 10 mm was drawn on the surface of the decorative sheet with magic ink (no. 500 black), and after 1 minute, the surface magic ink was wiped off with tissue paper (Elmore 200), and then visually evaluated. . ○ ・ ・ ・ No magic remaining △ ・ ・ ・ Partial magic remaining × ・ ・ ・ Magic remaining

As an evaluation of scratch resistance, a load of 1 kg / cm 2 of steel wool (# 0000) was applied from above the decorative sheet, and the surface of the decorative sheet was visually observed after reciprocating 20 times. ○ ・ ・ ・ No scratch (no significant change) △ ・ ・ ・ Slight scratch (change is observed) × ・ ・ ・ Scratch (large change)
The results as described above are shown in Table 1.

  The decorative sheet of the present invention can be used as an interior material, a surface material for furniture and fittings, a kitchen door, a storage door, an indoor door, and the like.

DESCRIPTION OF SYMBOLS 1 ... Base material 2 ... Pattern pattern layer 3 ... Transparent thermoplastic resin layer 4 ... Surface protective layer 5 ... Pear-like uneven pattern

Claims (2)

  A decorative sheet provided with at least a picture pattern layer and a transparent thermoplastic resin layer in this order on a substrate, provided with a satin-like concavo-convex pattern on the surface side of the transparent tree thermoplastic resin layer, and containing silicone It is a decorative sheet provided with a surface protective layer, the height difference of the unevenness on the surface after providing the surface protective layer is 20 μm or less, and from the horizontal surface of the surface after providing the surface protective layer to the uneven pattern The decorative sheet is characterized in that the reaching angle is 15 degrees or less, and the arithmetic average roughness Ra of the surface after providing the surface protective layer is 3 to 4 μm.   The decorative sheet according to claim 1, wherein the surface protective layer contains 2% to 9% of silicone with respect to 100 parts by weight of urethane resin.

Images