JPH06171048A - Plastic formed matter having suede-like surface - Google Patents

Abstract

(57) [Summary] [Purpose] Produces plastic moldings with stable quality, with a coating layer on the surface that has a suede-like texture that is excellent in appearance, texture, and touch as well as in performance such as abrasion resistance. The purpose is to provide good and inexpensive. [Structure] Suede-like coating by applying a coating solution in which colored beads having an average particle diameter of 5 to 50 μm are dispersed in a transparent binder to a thermoformable biaxially stretched polyester film or sheet having a breaking elongation of 140% or more. Form the layers. In addition, a heat-adhesive resin layer is provided on the back surface of the molded article to form a surface-decorating film or sheet. This is mounted on a mold of an injection molding machine and integrally molded, or is heated and softened by a pressure / vacuum molding machine and heat-bonded to the surface of the molded product.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for producing a plastic molded product having an excellent texture and can be used in the fields of packaging materials, office supplies, housing products and the like.

[0002]

2. Description of the Related Art Surface decoration methods for plastic molded products include direct printing, transfer printing, foil stamping, painting, electrostatic flocking, etc., each of which forms various decorative coatings on the surface of a plastic substrate. Is being done. Among these, electrostatic flocking and suede-like processing by spray painting are examples of things that enhance the sense of quality, including the elements of texture and touch, as well as design.

[0003]

However, although electrostatic flocking is superior in texture and quality, it causes a cost increase in terms of material cost and productivity, and has a weak point that abrasion resistance is low in terms of performance. There is. In addition, although suede-like processing by spray painting is excellent in performance, it has the drawback that it tends to cause uneven spraying, and it has difficulty in automation and equipment when dealing with a wide variety of products, resulting in cost increase.

Furthermore, PVC (polyvinyl chloride), PS
(Polystyrene), A-PET (Amorophus polyethylene terephthalate), ABS (Acrylonitrile-butadiene-styrene copolymer), etc. A general-purpose thermoplastic synthetic resin sheet having thermoformability is directly coated with a suede coating solution, and then applied. There is also a method of integrally molding by an insert injection method (for example, Japanese Patent Laid-Open No. 4-5921).
2), all of the general-purpose thermoformable sheets have inferior organic solvent resistance, and it is difficult to apply and dry a suede-like coating solution containing a large amount of an organic solvent, resulting in a suede-like appearance and feel. There is a drawback that a thick coating (solid content of 15 g / m ² or more) that cannot be damaged is not possible.

Therefore, an object of the present invention is to provide a plastic molded product having a suede-like texture excellent in appearance, texture, and touch as well as performance such as abrasion resistance, with high productivity and at low cost.

[0006]

In order to solve the above problems, a coating solution in which colored beads having an average particle size of 5 to 50 μm are dispersed in a transparent binder is applied in an amount of 15 to 50 g / m 2.
² (solid content), more preferably in the range of 20 to 40 g / m ² (solid content), on the surface of a biaxially oriented polyester film or a biaxially oriented polyester sheet that has a breaking elongation of 140% or more and is thermoformable. Apply to form a suede-like coated surface. Then, a thermo-adhesive resin layer is provided on the back surface of the molded article by applying an adhesive or by bonding a synthetic resin sheet having thermo-adhesiveness that can be thermoformed through the adhesive. Obtain a surface decoration film or sheet.

Next, the suede-tone coated surface of these films or sheets is mounted toward the molding die, and molten resin is injected from the adhesive or the heat-adhesive resin layer side to obtain an integrally molded product. As another method, the film or sheet may be heated and softened by a pressure / vacuum molding machine, and pressure / vacuum molding may be performed according to the surface shape of a separately prepared plastic molded product to integrate them.

The plastic molded product having a suede-like surface of the present invention manufactured by the above manufacturing process has a structure as shown in FIGS. 1 (a) and 1 (b). As a typical example, 1. Suede-like coating layer, 2. 3. Undercolor layer, 3.2 biaxially oriented polyester film or sheet layer, 4. Primer coat layer, 5. Adhesive layer, 6. Each layer of the heat-adhesive resin layer is laminated on the surface of the plastic molded product.

Here, 2. Under color layer and 4. The primer coat layer of 1 may be omitted if unnecessary, and conversely, if necessary, 1. A pattern may be printed on the suede-like coating layer.

[0010]

In the present invention, the suede-like coating film has a large number of minute colored beads irregularly exposed on the coating film surface,
These irregularities give a matte and deep suede-like appearance and feel. Therefore, when the coating amount of the coating film is 15 g / m ² or less in terms of solid content, unevenness is insufficient and the effect of suede tone becomes insufficient. Further, even when the coating amount is 50 g / m ² or more, the beads are sunk in the binder and the coating film surface becomes smooth, which is not preferable. Further, by providing a lower color layer by printing or coating between the suede-like coating layer and the biaxially stretched polyester film or sheet layer, the color tone exhibited by the suede layer is changed or uneven coating is made inconspicuous. be able to.

[0011]

EXAMPLES Examples will be described in detail below. (Example 1) First, a thermoformable biaxially stretched polyester film having a breaking elongation of 140% or more (Lumirror F8)
(6 made by Toray) A suede-like coating solution in which colored beads having an average particle size of 40 μm are dispersed in a transparent binder on a surface of 25 μm by a normal comma coater so that the solid content is 25 g / m ^2. It was applied and dried to form a suede-like coating layer.

Next, using a two-component curing type urethane adhesive (a mixture of Takelac A-515 and Takenate A-50 at a weight ratio of 10: 1) on the back surface thereof, a normal dry laminate is used. An ABS sheet (Sanpo Resin Co., Ltd. A-502) 250 μm was stuck by the method. This sheet was heated and softened at 110 ° C. in a pressure / vacuum molding machine, pressure-molded on the surface of an ABS resin housing product, and integrated to obtain a molded product having a good suede-like surface.

The composition of the suede coating solution is as follows. Binder (polyester / urethane resin) 15 parts by weight Colored beads (urethane resin beads / white and black) 20 parts by weight (particle size range 1.5 to 100 μm) Solvent (toluene / MIBK / acetic acid butyl ester) 64 parts by weight Additive (dispersing agent) 1 part by weight Total 100 parts by weight (Note) MIBK: Methyl isobutyl ketone As the colored beads, in addition to the urethane resin,
Acrylic resin, melamine resin, silicone resin,
It is also possible to use beads such as glass.

(Example 2) Colored beads having an average particle diameter of 25 µm in a transparent binder on a surface of 25 µm of a thermoformable biaxially stretched polyester film (Lumirror F86 Toray) having a breaking elongation of 140% or more. The suede coating solution in which was dispersed was applied and dried at a coating amount of solid content of 35 g / m ² using a comma coater to form a suede coating layer.

Next, after applying Adcoat 335AE (manufactured by Toyo Morton) as a primer at a coating amount of 5 g / m ² (solid content) on the back surface thereof, a polyester resin (manufactured by Byron Toyobo) as an adhesive was coated at 20 g / It was applied at m ² (solid content). The suede-processed surface of this film was mounted toward the mold of an injection molding machine, and ABS resin was melted and injected from the adhesive layer side to obtain an integrally molded product. The suede-like processing of the surface of this molded product was good in that the appearance and the touch were almost the same as when the film was processed.

The composition of the suede tone coating solution used in this example is as follows. Binder (polyester / urethane resin) 15 parts by weight Colored beads (urethane resin beads / white and black) 20 parts by weight (particle size range 1 to 90 μm) Solvent (toluene / MIBK / acetic acid butyl ester) 64 parts by weight Additive (Dispersant) 1 part by weight Total 100 parts by weight

Comparative Example 1 Colored beads having an average particle size of 40 μm in a transparent binder on a surface of 25 μm of a thermoformable biaxially stretched polyester film (made by Lumirror F86 Toray) having a breaking elongation of 140% or more. Was applied and dried using a roll coater at a coating amount of solid content of 13 g / m ² to form a suede coating layer.

Next, Adcoat 335AE (manufactured by Toyo Morton) as a primer was coated on the back surface at a coating amount of 5 g / m ² (solid content), and then a polyester resin (Byron Toyobo) was coated as an adhesive at a coating amount of 20 g / It was applied at m ² (solid content). The suede-processed surface of this film was mounted toward the mold of an injection molding machine, and ABS resin was melted and injected from the adhesive layer side to obtain an integrally molded product. In the suede-like processing of the surface of this molded product, the density of the unevenness due to the colored beads was reduced, and the texture was inferior. This is the same at the stage of processing into a film before integral molding, and no difference in suede effect due to molding is observed.

Comparative Example 2 Colored beads having an average particle size of 40 μm in a transparent binder on the surface of 25 μm of a thermoformable biaxially stretched polyester film (Lumirror F86 Toray) having a breaking elongation of 140% or more. Was applied and dried using a comma coater at a coating amount of solid content of 55 g / m ² to form a suede coating layer. The suede-finished surface of this film had a large coating amount and had a sufficient color density, but beads were sunk in the binder to reduce irregularities on the surface of the coating film, which was insufficient in terms of texture. . (Integral molding omitted)

[0020]

Industrial Applicability The present invention has an object to efficiently produce suede-like processing having a high quality and excellent performance for a three-dimensional molded article with good quality stability. This suede-like coating liquid contains a large amount of relatively high-boiling organic solvents, and requires a thick layer for performance, so it is particularly suitable for the film that will serve as the coating base material, especially for solvent resistance, heat resistance, and strength. , Performance such as thermoformability is important. From this point, a biaxially stretched polyester film or sheet that can be thermoformed with a breaking elongation of 140% or more is selected as the base film, and as a result, a normal roll-to- Roll coating method (roll coating, reverse roll coating, knife coating, die coating, comma coating, bar coating, etc.) allows sufficient heat drying without sagging, deformation, or cutting of the original fabric, making suede adjustment easy. A coating layer can be formed.

In addition, in the injection molding after formation of the adhesive layer or the heat-adhesive resin layer, or the integral molding by pressure / vacuum molding, since the breaking elongation is large, there is no trouble such as film breakage and there is a high-class feeling. It is possible to stably and efficiently provide a molded product having a suede-like appearance and touch with excellent performance.

[Brief description of drawings]

1A and 1B are enlarged cross-sectional views showing an example of the layer structure of a surface layer of a molded article having a suede-like surface according to the present invention.

FIG. 2 is an enlarged sectional view showing an example of a suede-like coating layer of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Suede-like coating layer 2 Undercolor layer 3 Biaxially oriented polyester film or sheet layer 4 Primer coat layer 5 Adhesive layer 6 Thermal adhesive resin layer 7 Plastic molding layer 8 Colored beads 9 Transparent binder layer

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Claims (3)

[Claims] 1. A surface having a suede-like texture by applying a coating solution in which colored beads are dispersed in a transparent binder to the surface of a thermoformable biaxially stretched polyester film or a biaxially stretched polyester sheet, and drying it. A plastic molded article, characterized in that an adhesive layer is formed on the back surface thereof and is integrally molded on the surface of the plastic molded article. 2. The plastic molded product according to claim 1, wherein the colored beads dispersed in the coating liquid have an average particle diameter of 5 to 50 μm. 3. The thermoformable biaxially stretched polyester film or the biaxially stretched polyester sheet has a breaking elongation of 140% or more.
Alternatively, the plastic molded product according to item 2.