JPH02263644A - Molding sheet - Google Patents

Abstract

PURPOSE:To improve appearance by integrally laminating a film having a specific thickness and metal gloss formed from a thermoplastic synthetic resin having a specific amount of metal particles dispersed and contained therein to the single surface of a thermoplastic synthetic resin sheet. CONSTITUTION:This molding sheet is constituted by integrally laminating a film 2 having a thickness of 0.006-2.0m/m and metal gloss formed from a composition wherein 0.1-30 pts.wt. metal particles 3 are dispersed and contained in 100 pts.wt. of a thermoplastic synthetic resin to the single surface of a thermoplastic synthetic resin sheet 1. As the metal particles 3, a powder or flake of aluminum, zinc, copper, chromium or brass can be used. As the forming material of the film 2, polyvinyl chloride, a vinyl chloride/vinyl acetate copolymer, polyethylene, polypropylene, polystyrene and polyester can be used alone or in a mixed state. As the thermoplastic synthetic resin sheet 1, a sheet of polyvinyl chloride, an acrylic resin, polyethylene, polyester, polypropylene, polystyrene or an ABS resin can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a molding sheet that can be used to obtain a molded product with an excellent metallic luster appearance by vacuum forming or pressure forming.

[Conventional technology]

Conventionally, as a method for obtaining a synthetic resin molded body exhibiting a metallic luster in appearance, as shown in FIG. 4, a method of kneading metal particles 3 into a synthetic resin 6 and obtaining a molded body by injection molding;
As shown in FIG. 5, a method is known in which the surface of a molded body formed by injection molding is coated with a metallic paint, or the surface of the molded body is subjected to wet or dry plating including metal vapor deposition.

In addition, in FIG. 5, the code|symbol 4 shows a metal link coating layer.

[Problem to be solved by the invention]

However, in the method of kneading metal particles 3 into synthetic resin 6 and obtaining a molded body by injection molding, the flow of the synthetic resin 6 during injection molding is poor due to the kneading of the metal particles 3. There is a problem in that surface color abnormalities such as weld lines and flow marks, which are often seen in molded products formed by molding, become more noticeable.

In addition, with this method, the metal particles 3 kneaded into the synthetic resin 6 are easily deformed or crushed due to the large molding pressure during injection molding, resulting in a cloudy color tone due to the finely divided metal particles 3. Another problem is that it is difficult to obtain a molded product with excellent metallic luster.

On the other hand, the method of applying metallic cladding after injection molding is
Surface abnormalities such as weld lines that occur during injection molding are less noticeable, and the metallic luster is excellent.

However, since this method involves surface painting of a synthetic resin molded article, sufficient baking cannot be performed. Therefore,
There are problems in that the physical properties of the coating film are poor, and it is prone to fingerprints and stains.

In addition, with this method, the orientation of the metal particle flakes in the metallic paint is poor in some corners of the molded body, and as a result, the metal particle flakes stand up in some corners, and the corners and non-corners are separated. There is a problem in that there are subtle differences in appearance between the two.

In addition, the method of performing metallic link mounting after molding requires an additional mounting step after molding, so there is a problem in that the production cost becomes high, especially when using vapor deposition or plating methods.

Therefore, the technical object of the present invention is to obtain a molded article with excellent metallic luster and a clear color tone comparable to that of a metallic coating without using injection molding.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a thermoplastic synthetic resin layer on at least one side of a thermoplastic synthetic resin sheet.
A molding sheet was constructed by laminating and fixing a film having a metallic luster to a thickness of 0.006 to 2.0" and containing 0.1 to 30 parts by weight of metal particles dispersed in 0.00 parts by weight. be.

[Effect]

The above-mentioned molding sheet has a thermoplastic synthetic resin film laminated and fixed on at least one side of the thermoplastic synthetic resin sheet. When pressure-formed, a molded product with metallic luster on the outer surface is obtained.

The amount of metal particles to be blended is 0.1 to 30 parts by weight per 100 parts by weight of the thermoplastic synthetic resin; less than 0.1 part is insufficient to give a metallic feel, and more than 30 parts. If this occurs, the elongation of the film decreases and the breaking strength becomes somewhat insufficient, causing problems when forming a part of the corner. In particular, film breakage occurs at some corners.

In addition, the thickness of the films to be laminated is set to 0.006 to 2.0.
The reason why the range is m/m is that if it is less than 0.006", the hiding power of the metal particles in a part of the corner will be insufficient, and there is a risk of cracking or tearing the film. On the other hand,
This is because if the thickness exceeds 2.018, the orientation of the metal particles will drop significantly and the metallic feel will fade, and even if the thickness exceeds this, the effect of giving a metallic feel will not improve. . Preferably a thickness of 0°010"/-0.150" is effective.

〔Example〕

The basic structure of the molding sheet according to the present invention is, as shown in FIG. It is laminated and fixed together.

In addition, as shown in FIG. 2, a transparent film 5 is laminated on the surface of the synthetic resin film 2 of the laminate shown in FIG. 1 to improve the durability of the synthetic resin resin film 2 having metallic luster. It's okay.

Furthermore, as shown in FIG. 3, the laminate shown in FIG.
Two sets may be laminated to form a plurality of layers of synthetic resin film 2 having metallic luster.

As the metal particles 3, powders and flakes of aluminum, zinc, copper, chrome, brass, etc. can be used, and among them, aluminum flakes and brass flakes used in metallic paints are preferred, but particles with excellent metallic luster are preferred. If so, the type is not particularly limited. The size of the metal particles 3 is not particularly limited, but particles under 100 mesh are preferably used.

As the material for forming the film 2 containing the metal particles 3, polyvinyl chloride, a copolymer of polyvinyl chloride and polyvinyl acetate, polyethylene, polypropylene, polystyrene, and polyester can be used singly or in mixtures. The type is not particularly limited, preferably as long as it has excellent transparency and good film formability. The metal particles 3 are kneaded using a heated roll and formed into a film along a mirror-finished roll. In this case, additives such as color pigments, stabilizers, and antioxidants may be added as necessary. Alternatively, there is no problem in forming a film using a die method from a screw type kneading machine.

As mentioned above, the blending amount of the metal particles 3 is from 0.1 to 100 parts by weight of the thermoplastic synthetic resin constituting the film 2.
It is important that the amount is 30 parts by weight.

Also, film 2. As mentioned above, the thickness of
It is important to set the thickness in the range of 65 to 2.0'', and the preferred thickness is related to the overall thickness of the laminated sheet and the degree of molding, but it is usually in the range of 0.030 to 0.150''. .

As the thermoplastic synthetic resin sheet 1 to be laminated with the film 2, a sheet of polyvinyl chloride, acrylic, polyethylene, polyester, polypropylene, polystyrene, or ABS resin, usually having a thickness of 0.3 to 5 cm, can be used. The sheets may be composites or mixtures of these resins may be used.

Methods for laminating and integrating the film 2 and the sheet 1 include heat lamination and hot press thermocompression bonding methods, but adhesives may also be used, and heat-melting films may also be used. . Alternatively, a pressure sensitive adhesive may be used.

[Experimental Example 1] 5 parts of aluminum flakes (741ON manufactured by Toyo Aluminum Co., Ltd.) were added to 100 parts by weight of commercially available soft vinyl chloride resin.
S) was blended and kneaded for 10 minutes at 170°C using a hot roll, and then molded into a 20 μm thick film along a mirror roll. This film was used as a commercially available hinyl chloride sheet for vacuum forming 2IIllIr! L-heat pressure bonding (170'C+5
℃) to form an integral layer, and after holding in a furnace at 170''C for 30 seconds, vacuum forming was performed to obtain a molded body.

The metallic feel in some corners was visually evaluated and was found to be very good. In order to evaluate the metallic feel of the smooth part, we used a Suga Test Instruments colorimeter (45°~0'' method).
When the value was measured, it was comparable to the coating described below. The results are shown in the attached table.

[Experimental Example 2] 0.5 part of a colored pigment (phthalocyanine blue) was used in combination,
An experiment was conducted in the same manner as in Experimental Example 1 except that the film layer was changed to 50μ, and good results were obtained.

[Experimental Example 3] Metal particles were made of brass (manufactured by Toyo Aluminum Co., Ltd., 83-9
47) An experiment was conducted in the same manner as in Experimental Example 1 except that the film thickness was 7 parts and the film thickness was 80 μm, and good results were obtained.

[Comparative Examples 1 to 3] An ABS resin injection molded product (about 2 m thick) was coated with cellulose lacquer containing metal particles, resulting in a 30 μm thick metallic! ! ! When the film was formed, an excellent metallic feel was obtained, but the orientation of the metal flakes was not aligned in some corners.
It is a little less glossy and leaves fingerprint marks.

The metal particles in the paints used in Comparative Examples 1 and 2 were aluminum flakes, and in Comparative Example 2, colored pigments (
0.5 part of phthalocyanine blue) is also used. Further, the metal particles in the paint used in Comparative Example 3 were brass.

[Comparative Examples 4 to 6] 100 parts by weight of ABS resin pellets and 2 parts by weight of metal particles were kneaded using a pressurized knee gun, and the raw material compound obtained in 1) was injection molded to produce a molded product with a thickness of approximately 2 ma+. As a result, it had a slightly cloudy color tone. Furthermore, as shown in the attached table, there was a tendency for the L value to decrease and the b value to increase.

Note that the metal particles used in Comparative Examples 4 to 6 and their blending ratios correspond to Experimental Examples 1 to 3, respectively.

Attached Table [Effects of the Invention] According to the present invention, as described above, a molded article having an appearance with a clear metallic luster equivalent to that of a metallic coating can be obtained at low cost by vacuum forming or pressure forming.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a first embodiment of the molding sheet according to the present invention, FIG. 2 is a sectional view showing a second embodiment of the same, and FIG. 3 is a sectional view showing a third embodiment of the same. The sectional views shown in FIGS. 4 and 5 are sectional views of conventional examples, respectively. 1... Sheet, 2... Film, 3... Metal particles, 4...
Coating layer, 5...Transparent film, 6...
・Synthetic resin. Patent applicant: Toyo Aluminum Co., Ltd.

Claims (1)

[Claims] (1) 0.1 to 30 parts by weight of metal particles are dispersed on at least one side of the thermoplastic synthetic resin sheet based on 100 parts by weight of the thermoplastic synthetic resin, and the thickness is 0.006 to 2.
A molding sheet made by laminating and integrating films with a metallic luster of 0m/m.