JP3276345B2 - Surface decorative sheet and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to the interior and exterior of a building, surface makeup of the furniture and fittings, a method of manufacturing a surface decorative sheet that is used in the interior of the vehicle or the like.

[0002]

2. Description of the Related Art As a surface decorative sheet, a laminated decorative sheet in which a plastic film is laminated on a printed material using paper or a plastic film as a printing base material is used today, and a pre-coated decorative material obtained by applying a resin to the printed material. Paper or pre-coated decorative sheets have been used.

[0003]

In the case of the precoated decorative paper or the precoated decorative sheet (hereinafter referred to as "precoated decorative paper or the like"), the surface physical properties such as abrasion resistance, V, etc.
When the wet application amount of the resin is set to 30 g / m ² or more and the thickness of the dried resin layer is set to 10 to 200 μm in order to improve processing characteristics such as a cutting process, the following problem occurs. (1) When a film having extremely low resistance to an aromatic, ester or ketone solvent, for example, an acrylic film, a styrene film, a polycarbonate film, an amorphous polyethylene phthalate film or the like is used as a printing substrate. However, the solvent in the resin coat layer acts on these films, causing a blocking phenomenon, and in the worst case, dissolving the films. (2) When an ink containing a thermoplastic resin as a binder is used as a printing ink, the printing ink becomes more susceptible to solvent attack as the resin coating amount of the resin coating layer increases, and the printed pattern is distorted and the sharpness of the pattern is increased. Is lost. (3) When solvent-resistant paper, metal foil, etc. are used as a printing substrate and a similar solvent-resistant thermosetting ink is used, the above problem does not occur, but a large amount of resin is applied. In the case where the thickness of the resin layer after drying is 10 to 200 μ, defects such as wrinkles occur during the production, and the resin is changed from a wet state containing a solvent to a dry state containing no solvent. During the transfer, a large amount of solvent evaporates, causing problems such as blemishes and cracks in the resin layer.

In the laminated decorative sheet, since the plastic film formed in advance is laminated on the printed material of the plastic film, the above-mentioned problem inherent in the case of precoated decorative paper or the like does not occur. However, in the case of a laminated decorative sheet, it is necessary to form a plastic film in advance, to laminate this on a printed matter, and to integrate the both with an adhesive or heat fusion, so that the manufacturing process is complicated and time-consuming, It is disadvantageous in that it is not efficient and the production cost is high.

[0005] Thus, the prior art has a problem in terms of both quality and cost, the development of surface decorative sheet manufacturing method that combines the advantages of the precoated decorative paper or the like which is excellent in the laminated decorative sheet and manufacturing cost superior in quality Has been waiting for.

Accordingly, a primary object of the present invention is to provide the above problems, such as a conventional precoated printing paper and a method of manufacturing a novel surface decorative sheet which overcomes the above mentioned disadvantages of conventional laminated printing sheet. Another object of the present invention is to provide a method for manufacturing a surface decorative sheet having the processing characteristics that can replace the excellent surface properties and conventional laminated decorative sheet wear resistance.

[0007]

Means for Solving the Problems The method of manufacturing a surface decorative sheet according to the present onset bright basically, printing layer and O on a print substrate
An HCO group-containing resin coat layer formed sequentially and dried; and a transfer sheet obtained by forming an NCO group-containing resin film layer on release paper and drying, the resin coat layer and the resin The method includes hot-pressing and integrating the coating layer with the coating layer, and then aging the integrated product at a predetermined temperature and time. The integrated material is cut into a predetermined length or wound into a roll before aging. The OH group-containing resin coating layer may be a OH group-containing thermoplastic resin such as vinyl chloride, butyral, or cellulose, or a polyol-type urethane coating compounded such that the OH groups are excessive in an OH / NCO molar ratio. Consists of The resin film layer containing the NCO group is OH / NCO
It is composed of a polyol type urethane coating compounded so that the NCO groups are excessive in molar ratio.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a surface decorative sheet 10 includes a printing layer 14 on a printing substrate 12, a resin coating layer 16 containing no organic solvent on the printing layer, and a resin coating layer 16 on the printing layer. And a resin coating layer 18 containing no organic solvent and bonded to the resin coating layer 16 via a urethane reaction.

[0009] In manufacturing the surface decorative sheet 10, FIG.
Two sheets shown in (a) and (b), that is, a print sheet 20 and a transfer sheet 30 are manufactured in advance. The print sheet 20 forms a print layer 14 by printing a desired pattern or the like on the print base material 12 and then forms a resin coat layer 16 by applying a resin containing an OH group on the print layer. Finally dry. By this drying, the organic solvent is removed from the resin coat layer 16.
It is no longer present and is not included.

[0010] The printing substrate 12 is paper, plastic film, metal foil, non-woven fabric or synthetic paper. The paper includes tissue paper, emulsion impregnated paper, and the like. Further, the plastic film includes polyethylene, polypropylene, polyethylene terephthalate, polyvinyl chloride,
Films such as polyvinylidene chloride, polystyrene, polycarbonate, polyvinyl alcohol, polyacryl, amorphous polyethylene terephthalate, nylon, cellophane and the like are included. Further, the metal foil includes aluminum foil, iron foil, stainless steel foil and the like.

The OH group-containing resin coat layer may be a thermoplastic resin containing OH groups such as vinyl chloride, butyral, and cellulose, or a polyol blended in an OH / NCO molar ratio such that the OH groups are excessive. Molded urethane paint. Examples of the polyol include a general polyol such as an acrylic polyol, a polyester polyol, and a polyether polyol, and a urethane-reactive resin having an OH group as a functional group. Examples of the NCO group-containing resin include generally known resins such as toluene diisocyanate, paraphenylene diisocyanate, and hexamethylene diisocyanate.
There are urethane-reactive resins containing groups.

On the other hand, the transfer paper sheet 30 is formed by applying a resin containing an NCO group on a release paper 17 to form a resin film layer 18 and drying the resin film layer 18. By this drying, the organic solvent evaporates and no longer exists in the resin film layer 18 and is not contained.

The release paper 17 includes a thermoplastic resin film including a polypropylene film, a polyethylene film, a polyethylene phthalate film (PET), the above-mentioned polypropylene film treated with silicone, a paper treated with silicone, and a paper and polypropylene film. Composite products and composite products of paper and polyethylene film are included.

The resin film layer containing the NCO groups is composed of a polyol type urethane coating compounded so that the NCO groups are excessive in OH / NCO molar ratio. Examples of the polyol include a general polyol such as an acrylic polyol, a polyester polyol, and a polyether polyol, and a urethane-reactive resin having an OH group as a functional group. Examples of the NCO group-containing resin include generally known resins such as toluene diisocyanate, paraphenylene diisocyanate, and hexamethylene diisocyanate, as well as NCO group-containing resins capable of urethane reaction.

In the manufacture of the surface decorative sheet 10, the printing sheet 20 and the transfer sheet 30 are hot-pressed in a state where the former resin coat layer 16 and the latter resin film layer 18 are overlapped, and integrated. I do. Next, the integrated product is cut into a predetermined length according to the intended use, or the integrated product is wound up in a roll shape, and then subjected to aging at a predetermined temperature and time. Printing sheet 20 and transfer sheet 30
Is pressurized with heat to initiate a urethane reaction between the OH groups in the resin coat layer 16 and the NCO groups in the resin film layer 18. The reaction is terminated by the completion of aging, and both layers 14, 16 are cured and adhered. When the aging is completed, the release paper 17 forms a part of an integrated product. The face decorative sheet 10 according to the present invention is configured by other parts except the release paper 17, and the release paper 17 is peeled off when the surface decorative sheet 10 as a final product is used. Until its use, the release paper 17 protects the resin film layer 18.

[Specific Examples] Amorphous polyethylene terephthalate film ("Rivesta" colored 80 manufactured by Riken Vinyl Co., Ltd.)
μ) was used as a printing substrate 12, and a wood grain pattern was gravure-printed on the printing substrate using a polyvinyl chloride-based ink (“MVA” manufactured by INTEC) to form a print layer 14. On the printing layer 14, OH group-containing vinyl chloride is added to MEK / ethyl acetate 1: 1.
Of the resin solution (NV = 36%) dissolved at a ratio of
The resin coating layer 16 is applied by using a solid plate of 0 L / inch.
Formed and dried. The thickness of the resin coat layer 16 after drying was 2.2 μm. Thus, a print sheet 20 was obtained.

On the other hand, a PET film treated with silicone is used as a release paper 17, and a urethane paint containing modified acrylic as a polyol, which is blended with an NCO group in excess, is applied to the release paper by a Brunose coater.
The resin coating layer 18 was formed by applying a thickness of 00 μm and dried. The thickness of the resin film layer 18 after drying was 78 μm. Thus, a transfer sheet 30 was obtained.

The printing sheet 20 and the transfer sheet 30 in which the resin coating layer 16 and the resin coating layer 18 are superimposed are integrated by applying pressure between hot rolls at a temperature of 100 ° C. using a dry lamination machine. Wound up.
The rolled integrated product was aged in an aging chamber at 50 ° C. for 72 hours to terminate the urethane reaction.
The face decorative sheet 10 as a product by peeling off the release paper 17
I got

The surface decorative sheet as the product obtained is
There is no inferiority in surface physical properties and processability as compared with the conventional PVC doubling product which is one of the laminated decorative sheets, and the solvent resistance which affects the surface physical properties is superior to the conventional PVC doubling product. It is also very advantageous in terms of manufacturing cost. In addition, unlike PVC doubling products, there is no risk of generating harmful gases such as dioxin when incinerated.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a surface decorative sheet manufactured according to the present invention.

FIG. 2 is a cross-sectional view showing a printing sheet and a transfer sheet used for manufacturing the surface decorative sheet shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Surface decorative sheet 12 Printing base material 14 Printing layer 16 Resin coating layer 17 Release paper 18 Resin coating layer 20 Printing sheet 30 Transfer sheet

Claims (9)

(57) [Claims] 1. A printing sheet in which a printing layer and a resin coating layer containing an OH group are sequentially formed on a printing substrate and dried, and a resin coating layer containing an NCO group is formed on a release paper and dried. Transfer sheet, the resin coating layer and the resin film layer in a state of being overlapped by hot pressing in a state of being overlapped, and then performing aging at a predetermined temperature and time, the surface decorative sheet, Production method. 2. The method according to claim 1, wherein the integrated object is wound up prior to the aging. 3. The method according to claim 1, wherein the integrated object is cut to a predetermined length prior to the aging. 4. The resin coat layer containing an OH group is blended such that the OH group is excessive in a OH group-containing thermoplastic resin such as vinyl chloride, butyral, and cellulose, or an OH / NCO molar ratio. The method according to claim 1, comprising a polyol-type urethane paint. 5. The method according to claim 1, wherein the resin film layer containing the NCO group is O
The method according to claim 1, comprising a polyol-type urethane coating compounded so that NCO groups are excessive in H / NCO molar ratio. 6. A printing substrate, a printing layer on the printing substrate,
The printing sheet used in the method for producing a surface decorative sheet according to claim 1, comprising a resin coating layer containing an OH group but not containing an organic solvent on the printing layer. 7. A release paper comprising a release paper and a resin film layer containing NCO groups but not containing an organic solvent on the release paper.
A transfer sheet used in the method for producing a surface decorative sheet according to 1 above. 8. The method for producing a printing sheet according to claim 6, comprising forming a printing layer on a printing substrate, forming a resin coating layer containing an OH group on the printing layer, and drying. . 9. The method for producing a transfer sheet according to claim 7, comprising forming a resin film layer containing an NCO group on a release paper and drying.