JPS60253518A - Manufacture of synthetic-resin molded article superior in dazzleproof property - Google Patents

Abstract

PURPOSE:To manufacture a synthetic-resin molded article which is superior in dazzleproof properties, by a method wherein a thermoplastic film or a sheet to one side of which a coat or processing which is superior in the dazzleproof properties is applied is fitted to the inside of a mold and then a synthetic resin material is poured into the mold through injection molding. CONSTITUTION:A thermoplastic plastic film or a sheet to one side of which a coat or processing which is superior in dazzleproof properties is applied is blanked into an identical shape with that of a desired part of a synthetic-resin molded article. Then a blanked piece is fitted to a cavity part corresponding to the desired part of a mold for the molded article. The mold is clamped, high- pressure injection of molten resin is performed by an injection molding device, the blanked piece and the molten resin are molded unitarily by laminating them and the molded article is taken out from the mold.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method for producing synthetic resin molded products with excellent anti-glare properties, and provides machine covers, display covers, television front panels, nameplates, cheekbones, etc. It is something that can be done.

[Conventional technology and its problems]

Synthetic resin molded products are widely used, having various advantages such as being lightweight, easy to shape, easy to color, rust-free, and high productivity. However, when synthetic resin molded products are used for machine covers, display covers, TV front panels, nameplates, etc., the surface has excellent gloss, so light reflects off the surface, making it difficult to see text and images. arise. In addition, from a design perspective, the use of matte surfaces to give a sense of luxury is expanding.

In response to such uses, fine particles such as silica and mica are added to molded products, but since these fine particles are uniformly dispersed in the molded product, anti-glare properties are reduced. The required anti-glare effect of the surface layer cannot be fully satisfied with the usual addition amount, and although improvements can be made by increasing the addition amount, there is a decrease in light transmittance and other physical properties. Also, there were drawbacks such as fine particles adhering to the mold during molding.

On the other hand, there is a method in which a paint containing fine particles is applied to the surface of a synthetic resin molded product and baked to form an anti-glare film, but although this method improves the anti-glare properties, it is difficult to coat each individual molded product. This increases the number of painting steps required, and the solvent in the paint components can cause cracks in the synthetic resin molded product, resulting in poor appearance and deterioration of physical properties.Also, it is difficult to limit the painting to only the desired areas. However, there were limitations in terms of product design. There is also a method of creating anti-glare properties by adding irregularities to the surface of the mold, but this method requires molds that meet each anti-glare performance requirement and is not practical in terms of cost.

[Means for solving problems]

The present invention provides a method for producing an anti-glare synthetic resin molded article that overcomes the drawbacks of conventional methods.

That is, in the present invention, a thermoplastic plastic film or sheet that has been coated or processed with excellent anti-glare properties on one side is installed in a mold, and then a synthetic resin material is injection molded into the mold. A method for producing a synthetic resin molded product with excellent anti-glare properties, characterized by laminating and integrating the thermoplastic plastic film or sheet with a resin layer formed by injection molding, and a preferred embodiment. In this case, the plastic film or sheet that has been coated or processed with excellent anti-glare properties on one side is made of polycarbonate resin, and the synthetic resin material used for injection molding is heat-fused to the polycarbonate resin film or sheet during injection molding. It is something to do.

The manufacturing process is as follows: (1) A thermoplastic film or sheet that has been coated or processed with excellent anti-glare properties on one side is punched out into the same shape as the desired part of the synthetic resin molded product, and the punched pieces are cut out. The process of creating
(2) a step of attaching the punched piece to a part of the cavity corresponding to a desired part of the mold for the molded product; (3) closing the mold, injecting molten resin at high pressure by injection molding means, and punching out the molded product; A step of laminating and integrally molding the piece and the molten resin, and (4)
) The process includes the step of taking out the molded product from the mold, and also includes the step of taking out the molded product from the mold, and applying a thermoplastic film or sheet that has been coated or processed on one side with excellent anti-glare properties to the desired shape of the synthetic resin molded product. Punch out into the same shape,
This method consists of simultaneously performing the step of creating a punched piece and the step of mounting it in a part of the cavity corresponding to the desired part of a synthetic resin mold when the mold is closed.

A thermoplastic plastic film or sheet with an anti-glare coating or anti-glare treatment on one side is made of thermoplastic plastics such as polycarbonate resin, polycarbonate resin-polybutylene terephthalate resin composition, polymethyl methacrylate (PMMA), acrylonitrile. -Styrene copolymers (AS resins), rubber-modified vinyl aromatic compound copolymers (ABS, MBS, MAS)
, MMAS resin, etc.), polystyrene, modified polyphenylene ether resin (modified PPE), acetyl cellulose, and other transparent or opaque plastics, with a normal thickness of 100 to 1000μ, especially 200 to 500μ. Anti-glare can be achieved by coating a known anti-glare paint and then curing it using heat or ultraviolet rays, the process of manufacturing the resin film mentioned above, or passing the manufactured film through a heated roll with an uneven surface. This is done by forming glare-reducing unevenness on the surface.

An example of the production of a plastic film or sheet with a film with excellent anti-glare properties on one side using polycarbonate resin is to use a polycarbonate resin with a molecular weight of 25,000 or more using an extrusion T-die method. When manufacturing polycarbonate resin film or sheet, extrusion T is a method of passing it through a hot roll with an uneven surface.
This method includes applying an anti-glare coating to a polycarbonate resin film or sheet produced by a die method or the like by a wire bar method or the like, and then heating and drying the coating.

Next, examples of thermoplastic plastics used in the injection molding of the present invention include those similar to those used for the anti-glare film or sheet described above.

Here, the plus rank type used for films or sheets with an anti-glare film or anti-glare treatment on one side and the thermoplastic plastics used for injection molding are usually the same type of plastics with thermal adhesive and optical properties. preferred from the viewpoint of uniformity,
In addition, the melt viscosity of the plus rank used for the film or sheet is higher than the melt viscosity of the thermoplastic plastic used for injection molding, that is, it is recommended to use a material with a higher molecular weight. This is more preferable in terms of preventing collapse. In the case of polycarbonate resin, a film or sheet with an anti-glare coating or anti-glare treatment formed on one side has a molecular weight of 25,000 or more, and a polycarbonate resin with a molecular weight of 15,000 or more is used for injection molding.
000 to 25,000 is preferably used.

It should be noted that it is possible to use different polymers for these thermoplastic plastic films or sheets and the polymer for injection molding if they have heat-fusibility, or if they do not have heat-fusibility In some cases, this can be easily achieved by applying a primer coat. In these cases, a primer coat is applied for the purpose of promoting heat fusion with the thermoplastic resin to be injection molded, or to prevent the film from melting and losing its shape due to the resin being injection molded. -For example, it is preferable to apply a paint whose main component is a higher molecular weight substance of the same type as the molding resin, or a heat- or ultraviolet-curable paint - on the opposite side to the anti-glare surface.

Additionally, the thermoplastic film or sheet with an anti-glare coating or anti-glare treatment applied to one side can be easily fixed to the mold cavity using static electricity, suction force such as vacuum, or other conventionally known methods. I can do it.

In addition, dyes and pigments, antistatic agents, ultraviolet absorbers, infrared absorbers, and photochromic materials are added to films or sheets that have been treated with an antiglare coating or antiglare treatment on one side, or to plastics for injection molding. It is also possible to impart special performance by adding compounds having such properties.

Next, in order to facilitate understanding of the present invention, the present invention will be explained using the drawings.

FIG. 1 is an example of a perspective view of a synthetic resin molded product, which is a cathode ray tube cover molded according to the present invention, and FIG. FIG. 3
The figure is an enlarged view of part B in Figure 2, showing a thermoplastic plastic film or sheet 5.5' coated with an anti-glare coating on one side, and a resin layer 6 formed by injection molding of molten resin. are laminated and integrated. Further, FIG. 4 is an explanatory diagram schematically showing the injection molding process according to the present invention,
A thermoplastic film or sheet 5.5' with an anti-glare coating applied on one side, which is pre-attached to the molding die 7.7° for synthetic resin molded products, is a layer of molten resin flowing in through the runner 3 and gate 4. 6 and are thermally fused and integrated.

Although the above description has been made with reference to drawings, the shape of the synthetic resin molded product of the present invention is not limited to that shown in the drawings, and can take various shapes. It is also a preferred embodiment of the present invention to integrally mold functional parts such as the frame, the mounting portion, or the mounting tool.

"Example] Examples will be explained below.

Example-1 Anti-glare paint (manufactured by Nitto Kasei 01, NUV-2796) was coated on one side of an extruded polycarbonate film with molecular weights ao and ooo and a thickness of 200 μm using the wire barcode method.
D) and 10m/cm using a 120W/cm high pressure mercury lamp.
It cured at a speed of 1 minute to form an anti-glare film with a thickness of 5 μm. (referred to as film A).

In the process of extruding a polycarbonate sheet with a molecular weight of 28,000 and a thickness of 400 μm, a polycarbonate film with anti-glare properties on one side was obtained by passing it through a hot roll with an uneven surface. (referred to as film B).

5j5 Manufacture of synthetic resin molded product with improved Tl'A properties The anti-glare film forming film and anti-glare treated film obtained above were cut out into the shape of the molded product shown in Figure 1, and the shape shown in Figure 1 was cut out. The anti-glare coating surface or the anti-glare treated surface was attached to the mold for a molded article.

Next, a polycarbonate resin with a molecular weight of 23,000 (
PC) was injection molded.

In the obtained molded product, the anti-glare film-forming film and the molded resin part were completely integrated, and no boundary line was discernible. Also,
No damage to the anti-glare film or abnormal appearance was observed.

Example-2 Using film A of Example-1, modified polyphenylene ether resin (trade name: Iupiace AV-) was used as the injection molding material.
The molding was carried out in accordance with Example 1 except that 60) was used.

In the obtained molded product, the anti-glare film-forming film and the molded resin material were completely integrated.

Molded articles were obtained in the same manner as in Examples 1 and 2, except that the antiglare film was not used. These molded products (comparative example-
Using the molded products of Example 1 and 2) and Example 1.2, anti-glare properties were evaluated visually and with a gloss meter using a 60° incident surface. The results are shown in Table 1.

Table 1 *1, The larger the number, the more glare *2, ○: No glare, ×: Glare [Operations and effects of the invention] As described above, the synthetic resin with excellent anti-glare properties according to the present invention In a preferred embodiment of the molded article and its manufacturing method, (11) an anti-glare film is formed on the surface of the synthetic resin molded article, so the anti-glare properties can be improved very efficiently.

(2) A coating or treatment with excellent anti-glare properties is applied to one side and the polycarbonate resin film or sheet 1~ is heat-sealed and integrated with the molten resin layer in the injection mold, so there is no need to go through a special painting process. A synthetic resin molded article with desired anti-glare properties can be obtained, which is excellent in productivity and eliminates defects that tend to occur during the painting process.

(3) The molecular weight or melt flow value of the synthetic resin used for the polycarbonate resin film or sheet and the resin layer constituting the base of the molded product can be independently selected by applying a coating or processing with excellent anti-glare properties to one side. A highly fluid molding material can be used as the resin that constitutes the base of the product without worrying about cracking or deterioration of physical properties.

etc.

[Brief explanation of drawings]

Figure 1 is a perspective view for explaining the synthetic resin molded product of the present invention, Figure 2 is a sectional view taken along line AA' in Figure 1, and Figure 3 is a cross-sectional view of
FIG. 4 is a partially enlarged view of part B in the figure, and is a schematic diagram illustrating the state of injection molding of the synthetic resin molded product of the present invention. The numbers in the figure are respectively molded product, 2 varnish blue, 3: runner, 4: gate,
5.5' Two single-sided anti-glare film forming film, 6: Molten resin layer formed by injection molding, 7.7'': Mold not shown. Patent applicant Mitsubishi Gas Chemical Co., Ltd. Representative Nagano Japanese book, Figure 1, /゛Qin 4 Figure 3 et al.

Claims (1)

[Scope of Claims] (1) A thermoplastic plastic film or sheet with a coating or processing with excellent anti-glare properties on one side is installed in a mold, and then a synthetic resin material is placed in the mold by injection molding. A method for producing a synthetic resin molded article with excellent anti-glare properties, which comprises laminating and integrating the thermoplastic film or sheet with a resin layer formed by injection molding. 2. The method for producing a synthetic resin molded article according to claim 1, wherein the plastic film or sheet that has been coated or processed on one side with excellent anti-glare properties is a polycarbonate resin. 3. The method for producing a synthetic resin molded product according to claim 2, wherein the synthetic resin material used for injection molding is thermally fused to a polycarbonate resin film or sheet during injection molding. 4. fl) A step of punching out a thermoplastic plastic film or sheet that has been coated or processed with excellent anti-glare properties on one side in the same shape as the desired part of the synthetic resin molded product to create a punched piece, (2) (3) closing the mold, injecting the molten resin at high pressure by an injection molding means, and punching out the punched piece; A method 5 for producing a synthetic resin molded product according to claim 1, which comprises a step of integrally molding a piece and a molten resin in a thin layer, and (4) a step of taking out the molded product from the mold. A process of punching out a thermoplastic plastic film or sheet that has been coated or processed on one side with excellent glare in the same shape as the desired part of the synthetic resin molded product, and creating a punched piece, and the desired mold for synthetic resin molding. A method for producing a synthetic resin molded product according to claim 4, which comprises simultaneously carrying out the step of fitting the molded article into a part of the cavity corresponding to the part of the mold at the same time as the step of closing the mold.