JP2011056879A - Embossed decorative sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an embossed decorative sheet which has high production stability, secondary processing characteristics, e.g. wrapping processability and resistances to bending and whitening, especially satisfactory whitening resistance of conduit parts formed by embossing. <P>SOLUTION: In the embossed decorative sheet produced by forming a pattern ink layer on the surface of a polyolefinic substrate sheet, laminating a transparent polyolefinic resin layer on the pattern ink layer by extrusion lamination and forming an emboss pattern on the transparent polyolefinic resin layer by embossing, a thermoplastic transparent elastomer resin layer is formed between the pattern ink layer and the transparent polyolefinic resin layer in a sandwiched form through extrusion lamination. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  INDUSTRIAL APPLICABILITY The present invention is used as an interior / exterior material for a building such as a house, a construction material such as a construction material, a joinery, a furniture fixture, an exterior material such as a household equipment or a home appliance, a vehicle interior / exterior material such as an automobile. The present invention relates to a decorative sheet.

  Conventionally, as a decorative sheet for such use, a sheet obtained by printing an appropriate pattern on a polyvinyl chloride resin film has been mainly used. In recent years, taking into account environmental issues, there has been a switch to decorative sheets that use non-chlorine resin films such as polyolefin resins that do not cause the generation of harmful substances such as hydrogen chloride or dioxin during combustion. Progressing.

  By the way, a decorative sheet for such use is required to have good secondary processing characteristics such as lapping. Specifically, it is required that the tensile strength is low so that the sheet does not bounce during secondary processing, and that the sheet has a certain degree of elongation so as not to cause deterioration of the design feeling due to bending whitening of the bent surface of the sheet. . In particular, with regard to bending whitening, whitening of the conduit portion in embossing is noticeable in many cases.

Non-chlorine-based resin films made of the above-mentioned polyolefin-based resins, etc., do not satisfy balanced properties such as moderate flexibility, embossability, and scratch resistance compared to polyvinyl chloride resin films. It was considered difficult.
Therefore, in order to solve such problems, attempts have been made to improve secondary workability by making the film flexible by utilizing an elastomer film or adding an elastomer component to the polyolefin resin. .

However, a film with a richer elastomer component so that the fold whitening property is improved may cause problems in the production stability such as a film tray to a heat roll in the production process, resulting in fold whitening property and production stability. However, in reality, it is difficult to produce a film that can improve the whitening property in a drastic manner.
JP 2006-201687 A

  The present invention has been made to solve the above-mentioned problems, and the object of the present invention is excellent in production stability, secondary processing characteristics such as lapping, and resistance to bending whitening, particularly embossing. Another object of the present invention is to provide an embossed decorative sheet excellent in all of the whitening resistance of the conduit portion.

  The present invention solves this problem, that is, the invention according to claim 1 is provided by providing a pattern ink layer on the surface of a polyolefin-based substrate sheet, and extruding and laminating a transparent polyolefin-based resin layer on the pattern ink layer. The embossed decorative sheet is formed by laminating and embossed by embossing on the surface of the transparent polyolefin resin layer, and a thermoplastic transparent elastomer resin layer is provided between the pattern ink layer and the transparent polyolefin resin layer. An embossed decorative sheet characterized by being sandwiched by extrusion lamination.

  According to the first aspect of the present invention, the thermoplastic transparent elastomer resin layer improves the flexibility of the entire sheet, greatly suppresses the folding whitening property, and the portion that directly contacts a heat roll during production is a transparent polyolefin. Since it becomes a system resin layer, problems such as roll tray do not occur, and stable production is possible.

It is explanatory drawing which shows the structure of the cross section 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 a cross-sectional structure of one embodiment of the decorative sheet of the present invention. A pattern ink layer 2, a thermoplastic transparent elastomer layer 3, and a transparent polyolefin resin layer 4 are provided in this order on a polyolefin base sheet 1.

  The polyolefin-based substrate sheet 1 in the present invention is mainly composed of a polyolefin-based resin. The thickness is preferably 50 to 200 μm. It is preferable that the content of the polyolefin resin in the polyolefin substrate sheet 1 is 50 to 100% by weight because various properties such as followability to a curved surface are improved. Examples of the polyolefin resin include a polyethylene resin, a polypropylene resin, and a mixture thereof.

  Polyethylene resins include ethylene homopolymers, copolymers of ethylene as the main component with other monomers copolymerizable with ethylene (low density polyethylene (LDPE), high pressure low density polyethylene, linear Low density polyethylene (LLDPE), high density polyethylene (HDPE), ethylene-α-olefin copolymer (metallocene polyethylene) obtained by polymerization using a metallocene catalyst, a mixture of two or more of these, etc. Can be illustrated.

  Examples of the polypropylene resin include a propylene homopolymer (homopolypropylene), a propylene copolymer, and a mixture of two or more thereof. The propylene copolymer may be a random copolymer (random polypropylene) or block copolymer (block polypropylene) of propylene and ethylene or another α-olefin, a block copolymer or a graft copolymer containing a rubber component. Etc. The other α-olefin copolymerizable with propylene is preferably one having 4 to 12 carbon atoms, such as 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 4 -Methyl-1-pentene, 1-decene, etc. are mentioned, The 1 type (s) or 2 or more types of mixture is used. Usually, the mixing ratio of the α-olefin is about 1 to 10% by weight with respect to propylene.

  The pattern ink layer 2 in the present invention may be formed by a common printing method such as gravure printing using a common printing ink. However, as the pigment and binder contained in the printing ink, those having good weather resistance are suitable. Moreover, you may give weatherproof prescriptions, such as a ultraviolet absorber and a light stabilizer.

  The thermoplastic transparent elastomer layer 3 is mainly composed of a thermoplastic transparent elastomer resin. The thickness is preferably 50 to 200 μm, and is provided by being sandwiched by extrusion lamination. The thermoplastic transparent elastomer resin used is a hydrogenated diene polymer, a modified diene polymer, a styrene thermoplastic elastomer, an olefin thermoplastic elastomer, a vinyl chloride thermoplastic elastomer, a polyester thermoplastic elastomer, or a polyamide heat. Examples thereof include a plastic elastomer, a polyurethane-based thermoplastic elastomer, or a mixture thereof.

  The styrenic thermoplastic elastomer is a copolymer of a conjugated diene and a vinyl aromatic compound or a hydrogenated product thereof. For example, butadiene = styrene copolymer rubber, isoprene = styrene copolymer rubber, butadiene / isoprene = Examples thereof include styrene copolymer rubber, butadiene = p-methylstyrene copolymer rubber, and hydrogenated products thereof.

  Examples of the conjugated diene include conjugated dienes having 4 to 8 carbon atoms such as butadiene, isoprene, pentadiene, and 2,3-dimethylbutadiene.

  In the vinyl aromatic compound, the 1- or 2-position of the vinyl group may be substituted with an alkyl group such as a methyl group. Examples of the vinyl aromatic compound include vinyl aromatic compounds having 8 to 12 carbon atoms such as styrene, p-methylstyrene, and α-methylstyrene.

  Specific examples of the most preferable elastomer include hydrogenated styrene = butadiene rubber, styrene = ethylene / butylene = olefin crystal block copolymer, and olefin crystal = ethylene / butylene = olefin crystal block copolymer. Examples include elastomers modified to epoxy groups, carboxyl groups, amino groups, alkoxysilyl groups, isocyanate groups, hydroxyl groups, and the like.

  The transparent polyolefin resin layer 4 in the present invention is mainly composed of a transparent polyolefin resin. The thickness is preferably 10 to 50 μm, and is provided by being laminated by extrusion lamination. As the transparent polyolefin resin to be used, the same polyolefin resin as exemplified in the polyolefin substrate sheet 1 can be used, but transparent random polypropylene having a high ethylene content is suitable in consideration of embossability. is there.

A homopropylene resin colored sheet (“Rivestar TPO” manufactured by Riken Technos Co., Ltd.) having a thickness of 70 μm is used as the polyolefin-based substrate sheet 1 and is printed on the grain using a two-component urethane resin binder ink on a gravure printing machine. Layer 2 was designated.
On top of this, a transparent random polypropylene resin (extrusion thickness 10 μm) as the transparent polyolefin resin layer 4 and a thermoplastic transparent elastomer resin as the thermoplastic transparent elastomer layer 3 (“Notio” manufactured by Mitsui Chemicals, extrusion thickness 60 μm) Were coextruded and laminated so that the transparent random polypropylene resin layer was on the surface side.

  Immediately after extrusion laminating, an embossing plate with a maximum depth of 50 μm as a conduit-like embossing plate is set so that the embossing conditions are a heater temperature of 110 ° C., a preheating roll of 80 ° C., a slidac heater of 110 ° C./160° C./170° C. Embossing was performed at a line speed of 11 m / min at 30 ° C. by heating to obtain an embossed decorative sheet having surface embossing.

<Comparative Example 1>
Instead of the transparent random polypropylene resin (extrusion thickness 10 μm) and the thermoplastic transparent elastomer resin (“Notio” manufactured by Mitsui Chemicals, Inc., extrusion thickness 60 μm) of Example 1, transparent random polypropylene resin (extrusion thickness 60 μm) and ethylene An embossed decorative sheet was obtained in the same manner as in Example 1 except that co-extrusion of an ethyl acrylate adhesive resin (extrusion thickness: 10 μm) was carried out and extrusion lamination was performed so that the transparent random polypropylene resin layer was on the surface side. .

<Comparative Example 2>
An embossed decorative sheet was obtained in the same manner as in Comparative Example 1 and Example 1, except that 30% by weight of the thermoplastic transparent elastomer resin was blended with the transparent random polypropylene resin (extruded thickness: 10 μm) of Comparative Example 1.

<Bending whitening test>
The prepared embossed decorative sheet is attached to an aluminum substrate (0.5 mm), and the bend is bent at 90 ° so that the bent part is parallel to the embossed conduit direction at an ambient temperature of 5 ° C. Judged by. ○: not whitened, Δ: slightly whitened, ×: whitened.

<Production stability test>
At the time of creating the embossed decorative sheet, the state of peeling of the transparent thermoplastic resin layer from the embossing roll was visually observed. ○: No roll tray (adhering to the embossed roll), Δ: Slightly generated roll tray, ×: Roll tray generated.
The results are shown in Table 1.

  The embossed decorative sheet of the present invention is used for interior / exterior materials for buildings such as houses, construction materials, building materials such as joinery, furniture fixtures, exterior materials for household equipment and home appliances, and vehicle interior / exterior materials for automobiles, etc. Etc. are available.

DESCRIPTION OF SYMBOLS 1 ... Polyolefin-type base material sheet 2 ... Pattern ink layer 3 ... Thermoplastic transparent elastomer resin layer 4 ... Transparent polyolefin-type resin layer

Claims (1)

  A patterned ink layer is provided on the surface of the polyolefin-based substrate sheet, a transparent polyolefin-based resin layer is laminated on the patterned ink layer by extrusion lamination, and an embossed pattern by embossing is applied on the surface of the transparent polyolefin-based resin layer. An embossed decorative sheet, wherein a thermoplastic transparent elastomer resin layer is sandwiched by extrusion lamination between the pattern ink layer and the transparent polyolefin resin layer.

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