JP2008307880A - Two-color molded article and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain an improvement in designedness for consumers who attach great importance in recent years, to thinning, weight reduction and further enhancement of visibility of a display and a design, and also to attain mar resistance and an improvement in properties of wiping of a fingerprint or a stain, in regard to a plastic molded article used for the exterior of a portable game player, a digital camera, a cellular phone or the like. <P>SOLUTION: On the occasion of two-color molding wherein a transparent resin portion for protecting the display and the peripheral portion are molded of different materials, an optical film having a thin-film laminate consisting of thin-film layers having a high refractive index and a low refractive index is molded simultaneously. A thinning and weight reduction of the molded article, the improvement in the visibility of the display and in the designedness and also the enhancement of hardness, the improvement in stainproofness of the optical film molded simultaneously and a consequent improvement in durability, are attained by this method. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a portable game machine member, an automobile member, a vehicle member, a household appliance member, a mobile phone member, a personal computer member, an audio product member, a car navigation member, an office supplies member, a sports article member, a miscellaneous goods member, a glasses / sunglass member. The present invention relates to a two-color molded product used for a camera member, an optical article member, a measuring instrument member, and the like, and a manufacturing method thereof.
In particular, the present invention relates to a two-color molded product used for an exterior of an electrical appliance having a display such as a portable game machine, a digital camera, and a mobile phone, and a manufacturing method thereof.

  Currently, plastic molded products formed by injection molding are generally used for exterior members of portable game machines and mobile phones. Electrical appliances with displays such as portable game machines and mobile phones are required to provide anti-reflection performance and surface protection performance to the display section, and decoration performance is provided to the casing section (the exterior section around the display section). And providing surface protection performance. Usually, the display unit and the housing unit are molded separately, and each surface performance film is attached to the surface of the display unit and the housing unit to give each performance, and then the display unit is fitted into the housing unit. The finished product is completed. However, since this method requires many manufacturing process steps and increases manufacturing costs, it is required to simplify the manufacturing process.

  In recent years, the frequency of use of two-color molding has increased from the viewpoint of simplifying the manufacturing process and the demand for thinner and lighter molded product bodies (see Patent Document 1). Two-color molding is a technique for molding two types of materials with different compositions or colors at the same time, simplifying the manufacturing process, and enabling product development with a wide variety of functions and designs by combining various compositions or colors. It is.

However, products such as mobile game machines and mobile phones are often used in environments where visibility is poor and dirt and scratches are likely to occur, such as outdoors and in trains. It is necessary to impart each performance by bonding a surface protective film.
However, most molded product bodies molded using two-color molding have a curved shape, and the display unit and the housing unit are integrated, so a surface protective film or the like is bonded to the molded product body. That is technically difficult.

Japanese Patent Laid-Open No. 11-221839

  Accordingly, an object of the present invention is to provide a means for solving the above-mentioned problems, in which an optical film is arranged in a cavity of a mold, and at least two kinds of thermoplastic materials are sequentially injected, and the optical To provide a two-color molded product that achieves a reduction in thickness and weight by forming a film and a thermoplastic material at the same time, and has visibility, design, scratch resistance, and antifouling property, and a method for producing the same. It is in.

The invention according to claim 1 is a first step of injecting a first thermoplastic material into a cavity of a primary molding die in a closed state, and molding the first thermoplastic material, The primary molding die is opened, the molded first thermoplastic material is taken out, and the molded first thermoplastic material is disposed in the cavity of the secondary molding die in an opened state. A second step, and then a second step of closing the secondary molding die, injecting a second thermoplastic material into the cavity of the secondary molding die, and molding the second thermoplastic material. A method for producing a two-color molded article having at least
Placing an optical film in the cavity of the primary mold before injecting the first thermoplastic material or in the cavity of the secondary mold before injecting the second thermoplastic material; Molding the optical film and the first thermoplastic material or the second thermoplastic material simultaneously;
In addition, the present invention provides a two-color molded article manufacturing method, wherein the first thermoplastic material and the second thermoplastic material are different in composition or color.

The invention according to claim 2 is a two-color molded product formed by using the manufacturing method according to claim 1,
The optical film includes a base material, and at least one high refractive index thin film layer single layer, or a low refractive index thin film layer single layer, or a high refractive index thin film layer on one surface or both surfaces of the base material. A two-color molded product comprising: a thin film laminate in which one or more low refractive index thin film layers are alternately laminated.

In the invention according to claim 3, either one of the first thermoplastic material and the second thermoplastic material is a transparent plastic material,
The transparent plastic material and the optical film are formed at the same time,
The two-color molded article according to claim 2, wherein the transparent plastic material having the optical film has an average reflectance (incident angle of 5 °, wavelength of 380 to 780 nm) of 3% or less after being solidified. It is.

  According to a fourth aspect of the present invention, the base material and the single layer of the high refractive index thin film layer, or the single layer of the low refractive index thin film layer, or one layer each of the high refractive index thin film layer and the low refractive index thin film layer. The two-color molded article according to claim 2 or 3, wherein the two-color molded article has a printed layer between the thin film laminates alternately laminated as described above.

  According to a fifth aspect of the present invention, each of the base material and the single layer of the high refractive index thin film layer, or the single layer of the low refractive index thin film layer, or the high refractive index thin film layer and the low refractive index thin film layer is provided. The two-color molded article according to any one of claims 2 to 4, further comprising a hard coat layer between the thin film laminates alternately laminated as described above.

  The invention described in claim 6 has an antifouling layer on the outermost surface of the thin film laminate, and a water droplet contact angle on the antifouling layer surface is 100 ° or more. The two-color molded product according to any one of the above.

  In the present invention, an optical film is disposed in the cavity of the mold, at least two types of thermoplastic materials are sequentially injected, and the optical film and the thermoplastic material are simultaneously molded, thereby reducing the thickness and weight. The two-color molded product having the visibility, the designability, the scratch resistance and the antifouling property and the production method thereof can be obtained.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 or FIG. 2 is a production process schematic diagram showing the process of producing the two-color molded product of the present invention. The two-color molded product shown in FIG. 1 or 2 shows an example of the present invention. The two-color molded article of the present invention is composed of an optical film 1, a first thermoplastic material 2a, and a second thermoplastic material 2b.

The outline of the manufacturing process of the two-color molded product shown in FIG. 1 will be described below.
First, as shown in FIG. 1 (a), the primary molding die 3a is closed, the first thermoplastic material 2a is injected into the cavity 4a of the primary molding die, and the first thermoplastic material 2a is injected. Is molded.
Next, as shown in FIG. 1 (b), the primary molding die 3a is opened, and the molded first thermoplastic material is placed in the cavity 4b of the secondary molding die that is also open. Move and place. At the same time, the optical film 1 is placed in the cavity 4b of the secondary molding die.
Next, as shown in FIG. 1 (c), the secondary molding die 3b is closed, and the second thermoplastic material 2b is injected into the cavity 4b of the secondary molding die. Mold a color molded product. At this time, the primary molding die 3a is closed, the first thermoplastic material 2a is injected into the cavity 4a of the primary molding die, and the first thermoplastic material 2a is molded.
Next, as shown in FIG. 1D, the secondary molding die 3b is opened, and the completed two-color molded product is taken out. At this time, the primary molding die 3a is opened.
Next, as shown in FIG. 1E, the molded first thermoplastic material is moved and arranged in the cavity 4b of the secondary molding die in the open state. At the same time, the optical film 1 is placed in the cavity 4b of the secondary molding die.

  It is necessary to sequentially perform the steps shown in FIGS. 1A to 1E only at the initial stage of molding, but each time the steps shown in FIGS. 1C to 1E are sequentially performed after the first time. The finished product can be taken out. Moreover, although the two-color molding machine provided with two injection apparatuses is described in FIG. 1, this is one Embodiment of this invention, It is not limited to this.

Next, the outline of the manufacturing process of the two-color molded product shown in FIG. 2 will be described.
First, as shown in FIG. 2A, the optical film 1 is disposed in the cavity 4a of the primary molding die in an open state.
Next, as shown in FIG. 2B, the primary molding die 3a is closed, the first thermoplastic material 2a is injected into the cavity 4a of the primary molding die, and the optical film 1 and the first The thermoplastic material 2a is molded at the same time.
Next, as shown in FIG. 2 (c), the primary molding die 3a is opened, and the molded optical film 1 and the first heat are placed in the cavity 4b of the secondary molding die that is also open. Move and place the plastic material. In addition, the optical film 1 is disposed again in the cavity 4a of the primary molding die in an open state.
Next, as shown in FIG. 2 (d), the secondary molding die 3b is closed, and the second thermoplastic material 2b is injected into the cavity 4b of the secondary molding die. Mold a color molded product. At this time, the primary molding die 3a is closed, the first thermoplastic material 2a is injected into the cavity 4a of the primary molding die, and the optical film 1 and the first thermoplastic material 2a are simultaneously applied. Mold.
Next, as shown in FIG. 2E, the secondary molding die 3b is opened, and the completed two-color molded product is taken out. At this time, the primary molding die 3a is opened.
Next, as shown in FIG. 2 (f), the molded optical film 1 and the first thermoplastic material are moved and arranged in the cavity 4b of the secondary molding die in an open state. In addition, the optical film 1 is disposed again in the cavity 4a of the primary molding die in an open state.

  Although it is necessary to sequentially perform the steps shown in FIGS. 2A to 2F only at the initial stage of molding, every time the steps shown in FIGS. 2D to 2F are sequentially performed after the first time. The finished product can be taken out. FIG. 2 shows a two-color molding machine provided with two injection devices. However, this is an embodiment of the present invention and the present invention is not limited to this.

  Examples of the first thermoplastic material 2a in the present invention include acrylic, polycarbonate (PC), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polypropylene, polystyrene, polystyrene (PS), and nylon. It is not limited to this.

  The second thermoplastic material 2b in the present invention is the same as the first thermoplastic material 2a described above, but is not limited thereto.

  Here, the first thermoplastic material 2a and the second thermoplastic material 2b are different in composition or color. By combining a variety of compositions or colors in this way, it is possible to develop products with a wide variety of design and functionality.

  The injection device in the present invention is not particularly limited as long as it can inject a thermoplastic material to an arbitrary thickness. Although it is not an essential condition to have two or more units, if there is only one injection device, it takes time to replace the mold, and the second time using the secondary molding die 3b. Since the injection molding requires high accuracy, it is preferable to have the same number of injection devices as the number of molds.

  The molds (primary molding mold 3a and secondary molding mold 3b) in the present invention are not particularly limited as long as they are thermoplastic material to be used and have heat resistance. Here, the material for the primary molding die 3a and the secondary molding die 3b need not be the same.

  Moreover, as shown in FIG. 1 or FIG. 2, it is necessary to change the setting of the mounting position of the dies (primary molding die 3a and secondary molding die 3b) by providing a rotary turntable 5. Therefore, the injection accuracy can be kept high.

The optical film 1 in the present invention includes a base material and at least one high refractive index thin film layer single layer, or a low refractive index thin film layer single layer, or a high refractive index thin film on one surface or both surfaces of the base material. And a thin film laminate in which one or more layers and low refractive index thin film layers are alternately laminated. FIG. 3 is a cross-sectional view showing an example of the optical film 1 of the present invention. The optical film 1 includes a base 12 and a thin film laminate 14 provided on the base 12.
Moreover, as shown in FIG. 4, you may form the thin film laminated body 14 on both surfaces of the base material 12, and here, the high refractive index thin film layer 7, the low refractive index thin film layer 8, and high refractive index on one surface. A thin film laminate 14 in which three layers of the refractive index thin film layer 9 are sequentially laminated, and a thin film laminate 14 in which two layers of the high refractive index thin film layer 7 and the low refractive index thin film layer 8 are sequentially laminated on the other surface. It is shown.
However, the optical film 1 shown in FIGS. 3 and 4 is only an example, and the number of layers is not limited.

Examples of the base material 12 in the present invention include plastic, glass, metal, and a composite material of these.
Examples of plastic materials include polyester, polyamide, polyimide, polypropylene, polyethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetal, polyvinyl alcohol, polyurethane, polyethyl methacrylate, polycarbonate, polystyrene, polyphenylene sulfite, and polyethersulfide. Hong, polyethersulfone, polyolefin, polyarylate, polysulfone, polyparaxylene, polyetheretherketone, polyethylene terephthalate, polyethylene naphthalate, polyphenyl oxide, triacetylcellulose, cellulose acetate, silicon resin, fluororesin, acrylic resin, phenol Resin, epoxy resin, ABS resin, ABS alloy, etc. Not intended to be constant.
Examples of the glass material include, but are not limited to, soda lime glass, borosilicate glass, quartz glass, Pyrex (registered trademark) glass, alkali-free glass, lead glass, and the like.
Examples of the metal material include, but are not limited to, aluminum, stainless steel, iron, nickel, chromium, nichrome, zinc, tin, lead, gold, silver, copper, palladium, and plated steel plate.
Further, a material obtained by combining various plastic materials, glass materials, and metal materials may be used.

  The shape of the substrate 12 is not particularly limited as long as the surface is smooth, and examples thereof include a plate shape and a roll shape. However, when the optical film 1 and the first thermoplastic material 2a or the second thermoplastic material 2b are simultaneously molded using the primary molding die 3a or the secondary molding die 3b, the optical film 1 is rolled. In this case, it takes time to cut the optical film 1 in accordance with the molding shape of the first thermoplastic material 2a or the second thermoplastic material 2b. Therefore, in the cavity 4a of the primary molding die or in the secondary molding. The shape of the base material 12 disposed in the cavity 4b of the mold is preferably matched with the molding shape of the first thermoplastic material 2a or the second thermoplastic material 2b.

  The surface of the substrate 2 may be subjected to a surface treatment according to the purpose before the thin film laminate 14 is formed. As the surface treatment method, for example, corona treatment method, vapor deposition treatment method, electron beam treatment method, high frequency discharge plasma treatment method, sputtering treatment method, ion beam treatment method, atmospheric pressure glow discharge plasma treatment method, alkali treatment method, acid treatment The law etc. can be mentioned.

  The thickness of the base material 2 is appropriately selected according to the intended use, and is usually 5 μm or more and 10 mm or less. The plastic material may contain a known additive, for example, an ultraviolet absorber, a plasticizer, a lubricant, a colorant, an antioxidant, a flame retardant and the like.

  The high refractive index thin film layer in the present invention is a layer having a refractive index of 1.75 to 2.4 at a light wavelength of 550 nm and an extinction coefficient of 0.5 or less.

  Examples of the material for the high refractive index thin film layer include indium, tin, titanium, silicon, zinc, zirconium, niobium, magnesium, bismuth, cerium, chromium, platinum, carbon, tantalum, aluminum, germanium, gallium, antimony, neodymium, Elements such as lanthanum, thorium, hafnium, yttrium, rhodium, selenium, europium, ytterbium, scandium, praseodymium, samarium, or oxides, fluorides, sulfides, nitrides or oxides, fluorides of these elements And mixtures of sulfides and nitrides. The chemical composition of oxides, fluorides, sulfides, and nitrides may not match the stoichiometric composition.

  Here, the high refractive index thin film layers 7 and 9 shown in FIG. 3 are not necessarily made of the same material, and are appropriately selected according to the purpose.

  The low refractive index thin film layer in the present invention is a layer having a refractive index of 1.3 to 1.75 and an extinction coefficient of 0.5 or less at a light wavelength of 550 nm.

  Examples of the material for the low refractive index thin film layer include silicon oxide, aluminum oxide, magnesium oxide, titanium nitride, magnesium fluoride, barium fluoride, calcium fluoride, hafnium fluoride, lanthanum fluoride, sodium fluoride, and fluoride. Examples thereof include compounds such as aluminum, carbon fluoride, lead fluoride, strontium fluoride, ytterbium fluoride, neodymium fluoride, lithium fluoride, samarium fluoride, and mixtures of these compounds. The chemical composition of these compounds may not match the stoichiometric composition.

  The high refractive index thin film layer and the low refractive index thin film layer in the present invention are preferably formed by a vacuum film forming method such as a vapor deposition method, a sputtering method, a plasma CVD method, an ion plating method, an ion beam assist method.

  Regarding the optical constants of the refractive index and extinction coefficient, the change in the polarization state of the light reflected from the surface of the high refractive index thin film layer sample and the low refractive index thin film layer sample is measured using a spectroscopic ellipsometry method. It is possible to obtain it. With respect to the extinction coefficient, if it exceeds 0.5, light absorption increases, which is not preferable as a material for forming a thin film having the light reflection performance of the present invention.

  In a two-color molded product having a display such as a portable game machine or a cellular phone, for example, the optical film 1 shown in FIG. 3 is molded and solidified by molding simultaneously with the material used for the display unit of the portable game machine or the cellular phone. Antireflection performance and surface protection performance can be added to the later display unit. In addition, by molding the optical film 1 at the same time as the material used for the housing part (the exterior part around the display part) of a portable game machine, a mobile phone, etc., the design performance and surface protection are achieved on the molded and solidified housing part. Performance can be added.

  Moreover, as shown in FIG. 4, a high refractive index thin film layer single layer, or a low refractive index thin film layer single layer, or a high refractive index thin film layer and a low refractive index thin film layer are provided on both surfaces of the substrate 2. By laminating one or more thin film laminates alternately laminated, the combination of the base material 2 and the first thermoplastic material 2a or the second thermoplastic material 2b is a combination with weak adhesion. In some cases, a high refractive index thin film layer single layer, or a low refractive index thin film layer single layer, or a thin film laminate formed by alternately laminating one or more high refractive index thin film layers and low refractive index thin film layers. Strong adhesion can be expressed by sandwiching them in between. For example, the base material 2 can be PET or PC, and the first thermoplastic material 2a or the second thermoplastic material 2b can be ABS or acrylic.

  Here, when the optical film 1 is formed at the same time as the material used for the display unit of a portable game machine or a mobile phone, the material used for the display unit (the first thermoplastic material 2a or the second thermoplastic material 2b) is Transparent plastic material selected from acrylic resin, polycarbonate (PC) resin, polyethylene terephthalate (PET) resin, etc., and optical film 1 and transparent plastic material (first thermoplastic material 2a or second thermoplastic material 2b) It is preferable that the average reflectance of the molded product (after solidification) is 3% or less. Thereby, even when using a portable game machine, a mobile phone or the like in an environment where sunlight is inserted, such as outdoors, the visibility of the display can be kept good.

  Furthermore, as shown in FIG. 5, the optical film 1 has a base material 12, a high refractive index thin film layer 7, a low refractive index thin film layer 8, a high refractive index thin film layer 9, and a low refractive index from the side close to the base material 12. The thin film layer 14 is formed by sequentially laminating four layers of the thin film layer 10, the physical film thickness of the high refractive index thin film layer 7 is in the range of 10 nm to 40 nm, and the low refractive index thin film layer 8. The physical film thickness of the high refractive index thin film layer 9 is in the range of 70 nm to 120 nm, and the physical film thickness of the low refractive index thin film layer 10 is in the range of 70 nm to 150 nm. Within the following range, the average reflectance can be easily reduced, and the visibility of the display can be kept good, which is more preferable.

  The average reflectance in the present invention was measured with a spectrophotometer for specular reflectance at an emission angle of −5 ° at an incident angle of 5 ° in a wavelength region of 380 to 780 nm. The specular reflectivity at 5 degrees incidence is the ratio of the intensity of light reflected at -5 ° C in the normal direction with respect to the light incident from the normal direction + 5 ° C of the molded article (after solidification) made of the optical film 1 and the transparent plastic material. It is a measure of reflection due to specular reflection of the background.

  In addition, when the optical film 1 is formed at the same time as a material used for a housing part (exterior member around the display member) of a portable game machine or a mobile phone, a high refractive index thin film layer and a low refractive index thin film layer having different refractive indexes. Since the optical film 1 having the thin film laminate 14 in which the above and the like are alternately laminated can be adjusted in an arbitrary color and reflectance, design properties such as color and metallic luster can be added.

In FIG. 6, a thin film laminate 14 in which three layers of a high refractive index thin film layer 7, a low refractive index thin film layer 8, and a high refractive index thin film layer 9 are sequentially laminated on one surface of a substrate 12, the other surface An optical film 1 is shown in which a printing layer 11 and a high refractive index thin film layer 7 are sequentially laminated.
The printing layer 11 in the present invention imparts designability to a two-color molded product, and is formed by printing ink.
The printing layer 11 is formed by alternately laminating one or more layers each of a base material and a high refractive index thin film layer, or a low refractive index thin film layer, or a high refractive index thin film layer and a low refractive index thin film layer. 6 is only an example, and the present invention is not limited to this configuration.

  Examples of the ink used in the present invention include, but are not limited to, heat-dried ink and ultraviolet curable ink.

  The method for forming the print layer 11 in the present invention can be printed using a gravure printer or a screen printer, but is not limited thereto.

  The physical film thickness of the printing layer 11 in the present invention is preferably about 1 μm or more and 20 μm or less.

  The printing layer 11 is formed by alternately laminating a substrate and a single layer of a high refractive index thin film layer, or a single layer of a low refractive index thin film layer, or one or more layers of a high refractive index thin film layer and a low refractive index thin film layer. By forming between the thin film laminate, the heat from the plastic material (the first thermoplastic material 2a or the second thermoplastic material 2b) injected at a high temperature is cut off, and the ink melts. This can be prevented.

  Next, FIG. 7 is a sectional view showing an example of the optical film 1 of the present invention. The optical film 1 includes a base material 12, a hard coat layer 13 provided on the base material 12, a thin film laminate 14 provided on the hard coat layer 13, and a protective film provided on the thin film laminate 14. It consists of the dirty layer 15.

  As shown in FIG. 7, it is preferable to form a hard coat layer 13 by applying a hard coat material between the substrate 2 and the thin film laminate 14. This is because the hardness of the optical film 1 can be increased, and the two-color molded product of the present invention can be hardly damaged.

The hard coat layer 13 can protect the surface of the base material 12 from mechanical injuries such as scratches caused by pencils and scratches caused by steel wool. Here, the hard coat layer 13 is laminated between the base material 12 and the thin film laminate 14, but is not limited thereto, and may be laminated on the thin film laminate 14. At this time, the hard coat layer 13 can protect each layer formed on the substrate 12.
Further, the material for forming the hard coat layer 13 may be any material having an appropriate hardness and mechanical strength, and examples thereof include resin materials such as acrylic resins, organic silicon resins, and polysiloxanes.

  Examples of acrylic resins include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol (meth) acrylate, ethylene glycol di (meth) acrylate, and triethylene. Glycol di (meth) acrylate, tripropylene glycolic di (meth) acrylate, dipropylene glycol di (meth) acrylate, 3-methylpentanediol di (meth) acrylate, diethylene glycol bis β- (meth) acryloyloxypropionate, Trimethylolethane tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, (2-hydroxyethyl) isocyanate di (meth) acrylate, pentaerythritol tetra (meth) acrylate, 2,3-bis (meth) acryloyloxyethyloxymethyl [2.2.1] heptane, poly 1,2-butadiene di (Meth) acrylate, 1,2-bis (meth) acryloyloxymethylhexane, nonaethylene glycol di (meth) acrylate, tetradecane ethylene glycol di (meth) acrylate, 10-decanediol (meth) acrylate, 3,8-bis (Meth) acryloyloxymethyltricyclo [5.2.10] decane, hydrogenated bisphenol A di (meth) acrylate, 2,2-bis (4- (meth) acryloyloxydiethoxyphenyl) propane, 1,4- Bis ((meth) acryloyl Examples thereof include a mixture of oxymethyl) cyclohexane, hydroxypivalate ester neopentyl glycol di (meth) acrylate, bisphenol A diglycidyl ether di (meth) acrylate, epoxy-modified bisphenol A di (meth) acrylate and the like.

  Examples of the organosilicon resin include tetramethoxysilane, tetraethoxysilane, tetraisopropoxysilane, tetrapentaethoxysilane, tetrapentaisoproxysilane, methyltrimethoxysilane, methyltriethoxysilane, methyltripropoxysilane, Mention may be made of a mixture of butoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, dimethylethoxysilane, dimethylmethoxysilane, dimethylpropoxysilane, dimethylbutoxysilane, methyldimethoxysilane, methyldiethoxysilane, hexyltrimethoxysilane and the like.

  The hard coat layer 13 is formed by depositing these resin materials on the substrate 12 and curing them by heat curing, ultraviolet curing, or ionizing radiation curing. The hard coat layer 13 has a physical thickness of 0.5 μm or more, preferably 3 μm or more and 20 μm or less, more preferably 3 μm or more and 6 μm or less.

  The hard coat layer 13 can be formed by a conventionally known method such as a gravure coat method, a spray coat method, an air knife coat method, a roll brush method, a curtain coat method, and an impregnation coat method.

  Furthermore, it is preferable to form an antifouling layer 15 by applying an antifouling material having a water droplet contact angle of 100 ° or more to the outermost layer of the optical film 1. This is because water droplets, fingerprints and the like on the surface can be easily wiped off, and damage such as scratches due to impact on the surface can be prevented.

  In the present invention, the contact angle of the water droplet is determined by dropping 8 microliters of ion exchange water onto the surface of the antifouling layer, and after 1 minute in an atmosphere of 23 ° C. and 50% RH (relative humidity), the outer surface of the antifouling layer and the outer surface of the water droplet The angle formed by the tangent of the water drop and the antifouling surface at the point where the crossing points are measured.

  As the material of the antifouling layer 15 in the present invention, any material having water repellency, oil repellency and low friction properties may be used. For example, silicon oxide, fluorine-containing silane compound, fluoroalkylsilazane, fluoroalkylsilane, fluorine-containing Examples thereof include silicon compounds and perfluoropolyether group-containing silane coupling agents.

  The antifouling layer 15 is a vacuum dry process such as a vapor deposition method, a sputtering method, a chemical vapor deposition (CVD) method, a plasma polymerization method, a gravure coating method, a screen coating method, a dip coating method, a spray coating method, an offset coating method, or the like. The antifouling layer 15 has a physical film thickness of about 5 nm to 10 nm.

  Furthermore, the optical film 1 of the present invention has a transparent protective property, easy-to-use, directly or via an adhesive material on at least one surface of the base material, or on the outermost surface of the thin film laminate, or both. Adhesiveness, adhesiveness, adhesiveness, gas barrier properties, dielectric properties, electrical conductivity, electromagnetic wave shielding properties, antireflection properties, antiglare properties, anti-Newton ring properties, near-infrared cutting properties, UV-cutting properties, photocatalytic properties A functional thin film layer having at least one function may be formed.

  Examples of the present invention will be specifically described below.

<Example 1>
The optical film 1 shown in FIG.
In the optical film 1 in Example 1, a hard coat layer 13 is formed on a substrate 12, and a high refractive index thin film layer 7, a low refractive index thin film layer 8, a high refractive index thin film layer 9, and a low refractive index are formed on the hard coat layer 13. A thin film laminate 14 composed of the refractive index thin film layer 10 is formed, and an antifouling layer 15 is formed on the thin film laminate 14.

The base material 12 here is a colorless and transparent polyethylene terephthalate film having a thickness of 100 μm.
A hard coat layer 13 having a physical film thickness of 5 μm was formed on one surface of the substrate 12 by applying an acrylic hard coat material by a die coating method.

Titanium dioxide (TiO ₂ ) is deposited on the hard coat layer 13 by a vacuum deposition method using an electron beam, and a high refractive index thin film layer 7 having a physical film thickness of 30 nm (a refractive index of light having a wavelength of 550 nm is 2.32, An extinction coefficient of 0) was formed.

Silicon dioxide (SiO ₂ ) is deposited on the high refractive index thin film layer 7 by a vacuum vapor deposition method using an electron beam, and the low refractive index thin film layer 8 having a physical film thickness of 28 nm (the refractive index of light having a wavelength of 550 nm is 1.. 46, extinction coefficient 0).

Titanium dioxide (TiO ₂ ) is deposited on the low refractive index thin film layer 8 by a vacuum vapor deposition method using an electron beam, and the high refractive index thin film layer 9 having a physical film thickness of 40 nm (the refractive index of light having a wavelength of 550 nm is 2. 32, extinction coefficient 0).

Silicon dioxide (SiO ₂ ) is deposited on the high refractive index thin film layer 9 by a vacuum evaporation method using an electron beam, and the low refractive index thin film layer 10 having a physical film thickness of 85 nm (the refractive index of light having a wavelength of 550 nm is 1.. 46, extinction coefficient 0).

  Further, an antifouling layer 15 having a physical film thickness of 1 μm was formed on the thin film laminate 14 using a polymer material containing fluorine by a vacuum deposition method.

  The two-color molded product in Example 1 was molded by using the manufacturing process shown in FIG. 1, and a transparent PC material (first heat) as a material for a display unit in an injection molding machine capable of two-color molding. The plastic plastic material 2a) was molded using a black ABS material (second thermoplastic material 2b) as a material for the casing (display peripheral portion).

  When the average reflectance of the display portion of the finished molded product at an incident angle of 5 ° and a wavelength of 380 to 780 nm was measured using a spectrophotometer V-550 (manufactured by JASCO Corporation), the average reflectance of the display portion was measured. As a result, it was possible to obtain a molded article with good visibility of 2%.

  Moreover, the water droplet contact angle of the display part of the completed molded product was 100% or more, and a molded product having good wiping performance could be obtained.

<Example 2>
The optical film 1 shown in FIG.
In the optical film 1 in Example 2, a hard coat layer 13 is formed on a substrate 12, and a high refractive index thin film layer 7, a low refractive index thin film layer 8, and a high refractive index thin film layer 9 are formed on the hard coat layer 13. A thin film laminate 14 is formed, and an antifouling layer 15 is formed on the thin film laminate 14.

The base material 12 here is a colorless and transparent polyethylene terephthalate film having a thickness of 100 μm.
A hard coat layer 13 having a physical film thickness of 5 μm was formed on one surface of the substrate 12 by applying an acrylic hard coat material by a die coating method.

Niobium pentoxide (Nb ₂ O ₅ ) is deposited on the hard coat layer 13 by a sputtering method, and a high refractive index thin film layer 7 having a physical film thickness of 55 nm (a refractive index of light having a wavelength of 550 nm, 2.27, an extinction coefficient). 0) was formed.

Silicon dioxide (SiO ₂ ) is deposited on the high refractive index thin film layer 7 by a sputtering method, and a low refractive index thin film layer 8 having a physical film thickness of 155 nm (a refractive index of 1.46 for light having a wavelength of 550 nm, an extinction coefficient of 0). ) Was formed.

Niobium pentoxide (Nb ₂ O ₅ ) is deposited on the low refractive index thin film layer 8 by sputtering, and the high refractive index thin film layer 9 having a physical film thickness of 140 nm (the refractive index of light having a wavelength of 550 nm is 2.27, the extinction is reduced). An attenuation coefficient of 0) was formed.

  Further, an antifouling layer 15 having a physical film thickness of 1 μm was formed on the thin film laminate 14 using a polymer material containing fluorine by a vacuum deposition method.

  The two-color molded product in Example 2 is molded using the manufacturing process shown in FIG. 1 and is black as a material for a housing portion (display peripheral portion) in an injection molding machine capable of two-color molding. Molding was performed using a PET material (second thermoplastic material 2a) and a transparent PC material (first thermoplastic material 2b) as a display part material.

  The casing of the finished molded product had a metallic luster and a green color, and a molded product having good design properties could be obtained.

<Example 3>
The optical film 1 shown in FIG. 9 is used in Example 3.
In the optical film 1 in Example 1, a hard coat layer 13 is formed on a substrate 12, and a high refractive index thin film layer 7, a low refractive index thin film layer 8, a high refractive index thin film layer 9, and a low refractive index are formed on the hard coat layer 13. A thin film laminate 14 composed of the refractive index thin film layer 10 is formed, and an antifouling layer 15 is formed on the thin film laminate 14. Furthermore, the printing layer 11 and the high refractive material 8 are laminated on the opposite surface.

The optical film 1 used in Example 3 was printed on the printing layer 11 with ink using a screen printing machine, and titanium dioxide (TiO ₂ ) was deposited thereon by a vacuum vapor deposition method using an electron beam to form a physical film. It was formed in the same manner as in Example 1 except that a high refractive index thin film layer 9 having a thickness of 40 nm (refractive index of light having a wavelength of 550 nm: 2.32, extinction coefficient: 0) was formed.

  When the average reflectance of the display portion of the finished molded product at an incident angle of 5 ° and a wavelength of 380 to 780 nm was measured using a spectrophotometer V-550 (manufactured by JASCO Corporation), the average reflectance of the display portion was measured. As a result, it was possible to obtain a molded article with good visibility of 2%.

Moreover, the water droplet contact angle of the display part of the completed molded product was 100% or more, and a molded product having good wiping performance could be obtained.

The manufacturing process schematic of the two-color molded product of this invention. The manufacturing process schematic of the two-color molded product of this invention. Sectional drawing which shows an example of the optical film 1 of this invention. Sectional drawing which shows an example of the optical film 1 of this invention. Sectional drawing which shows an example of the optical film 1 of this invention. Sectional drawing which shows an example of the optical film 1 of this invention. Sectional drawing which shows an example of the optical film 1 of this invention. Sectional drawing which shows an example of the optical film 1 of this invention. Sectional drawing which shows an example of the optical film 1 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical film 2a 1st thermoplastic material 2b 2nd thermoplastic material 3a Primary mold 3b Secondary mold 4a Cavity 4b of primary mold Cavity 5 of secondary mold Turntable 7 High refractive index thin film layer 8 Low refractive index thin film layer 9 High refractive index thin film layer 10 Low refractive index thin film layer 11 Print layer 12 Base material 13 Hard coat layer 14 Thin film laminate 15 Antifouling layer

Claims (6)

A first step of injecting a first thermoplastic material into the cavity of the primary molding die in a closed state and molding the first thermoplastic material; and then opening the primary molding die Taking out the molded first thermoplastic material, placing the molded first thermoplastic material in the cavity of the secondary molding mold in an open state, and A two-color molded article having at least a third step of closing a secondary molding die, injecting a second thermoplastic material into the cavity of the secondary molding die, and molding the second thermoplastic material A manufacturing method of
Placing an optical film in the cavity of the primary mold before injecting the first thermoplastic material or in the cavity of the secondary mold before injecting the second thermoplastic material; Molding the optical film and the first thermoplastic material or the second thermoplastic material simultaneously;
A method for producing a two-color molded article, wherein the first thermoplastic material and the second thermoplastic material are different in composition or color. A two-color molded article formed using the manufacturing method according to claim 1,
The optical film includes a base material, and at least one high refractive index thin film layer single layer, or a low refractive index thin film layer single layer, or a high refractive index thin film layer on one surface or both surfaces of the base material. A two-color molded article comprising: a thin film laminate in which one or more low refractive index thin film layers are alternately laminated. Either one of the first thermoplastic material and the second thermoplastic material is a transparent plastic material,
The transparent plastic material and the optical film are formed at the same time,
The two-color molded article according to claim 2, wherein the transparent plastic material having the optical film has an average reflectance (incident angle of 5 °, wavelength of 380 to 780 nm) of 3% or less after being solidified. .   Thin film stack formed by alternately laminating one or more layers of the above-mentioned base material and single layer of high refractive index thin film layer, single layer of low refractive index thin film layer, or high refractive index thin film layer and low refractive index thin film layer The two-color molded article according to claim 2, further comprising a printed layer between the body and the body.   Thin film stack formed by alternately laminating one or more layers of the above-mentioned base material and single layer of high refractive index thin film layer, single layer of low refractive index thin film layer, or high refractive index thin film layer and low refractive index thin film layer The two-color molded article according to any one of claims 2 to 4, further comprising a hard coat layer between the body and the body.   6. The two-color molding according to claim 2, further comprising an antifouling layer on the outermost surface of the thin film laminate, wherein a water droplet contact angle on the antifouling layer surface is 100 ° or more. Goods.