JP2019116048A - Hard coat film for insert molding, insert molding, and on-vehicle display - Google Patents

Abstract

To provide a hard coat film for insert molding which achieves insert molding preventing wrinkles, and prevents glare.SOLUTION: A hard coat film 1 for insert molding is used for the surface of a display device, and a hard coat layer 3 is laminated on the surface on one surface side of a transparent base material film 2 formed of a thermoplastic resin. Ra (arithmetic average roughness) of the surface of the hard coat layer 3 is in a range of 1-90 nm, and RSm (average length of roughness curve element) is in a range of 1.0-35.0 μm.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hard coat film for insert molding used on the surface of a display device, an insert-molded product provided with the same film, and an in-vehicle display.

  In an on-vehicle display represented by a car navigation system, an insert molding method in which a hard coat film provided with a print layer and a thermoplastic resin are integrally molded by a mold is often used for surface protection and decoration. Moreover, since the conventional display for vehicles had the structure which the image display part and the housing | casing part consist of a separate member, and was combining these members, the hard court film provided on the surface of a display is also each member. Depending on the choice, it has been used.

  However, in recent years, with the spread of capacitive touch panels, as in car navigation systems, air conditioning controls etc. are also changing to touch operations, and displays in which an image display unit and a housing unit are integrated become popular I started. Along with this, a hard coat film printed with a design in which the image display unit and the housing unit are integrated has come to be used.

  Usually, the hard coat film is shaped by warm press molding in a process called pre-molding. Thereafter, as shown in FIG. 5 to FIG. 8, the molded hard coat film 11 is held in the injection molding die 12 and the thermoplastic resin melted from the back surface is poured in (the resin flow direction is indicated by 13). ), Integrated with the thermoplastic resin. At this time, the pressure of the thermoplastic resin is applied in multiple directions, and the sliding property between the hard coat film 11 and the mold 12 causes a problem that wrinkles occur in the longitudinal direction and the lateral direction. As a generation mechanism, the wrinkles 14 in the longitudinal direction come into contact with the hard coat film 11 in the mold 12 when the hard coat film 11 partially contacts (see FIGS. 5 and 6) and the molten resin 20 is filled. The hard coat film 11 is generated in close contact with the die 12 (see FIG. 8). Since the hard coat film 11 is in close contact, it is considered that the wrinkles do not come off and become marks. On the contrary, it is considered that the wrinkles in the transverse direction are generated when the hard coat film 11 shifts along the resin flow direction 13 when the molten resin 20 is filled. It is inferred that the slipperiness of the hard coat film 11 is affected in any case.

  Patent Document 1 describes a film insert molding method capable of accurately reproducing characters, patterns and the like in a resin molded product having a three-dimensional shape, but mentions no problem about the wrinkles generated in the longitudinal direction and the transverse direction. It has not been.

  Further, for slipperiness, there is a method of putting particles of 1 to 5 μm as in Patent Document 2. There is disclosed a method of forming unevenness on the film surface by particles to control the coefficient of friction, thereby improving the slipperiness of the film and the transportability at the time of printing. However, in recent years, the definition of the navigation screen has been increased, and particularly when a film containing particles is used, there is also a problem that the contained particles become bright spots to deteriorate visibility.

JP, 2016-147489, A JP 2005-187566 A

  With respect to the conventional hard coat film (hard coat film for insert molding) described above, JP-A-2006-112118 does not consider measures against wrinkles generated during molding. On the other hand, Patent Document 2 describes transparency and transparency in the portion of visibility but does not consider glare.

  The present invention is intended to solve the problems of such a conventional hard coat film, and is a hard coat film for insert molding without glaring which realizes insert molding without the occurrence of wrinkles, insert molding And providing an on-vehicle display.

A hard coat film for insert molding, an insert molded article and an in-vehicle display according to the present invention have the following configurations in order to achieve the above object. That is,
The hard coat film for insert molding according to the invention as set forth in claim 1 is a hard coat film used for the surface of a display device, which is a single layer or 2 on one surface of a transparent base film made of a thermoplastic resin. Hard coat layers of layers or more are laminated. And Ra (arithmetic mean roughness) of the outermost surface of the hard coat layer is in the range of 1 to 90 nm, and RSm (average length of the roughness curvilinear element) is 1.0 to 35.0 μm. In the range.

  According to the hard coat film for insert molding, by setting the values of Ra and RSm of the outermost surface of the hard coat layer to predetermined ranges, the slipperiness between the hard coat film for insert molding and the mold in insert molding can be obtained. Appropriately, it is possible to eliminate the occurrence of longitudinal wrinkles and crosswise wrinkles of the hard coat film for insert molding. In addition, by suppressing the values of Ra and RSm below a certain level, it is possible to eliminate glare in the image display of the insert-molded product obtained by insert molding.

  The hard coat film for insert molding according to the second aspect of the present invention is the hard coat film for insert molding according to the first aspect, wherein the single layer hard coat layer or the two or more hard coat layers is provided. In any hard coat layer of the above, fine particles are included, and the average particle diameter of the fine particles is in the range of 10 to 400 nm.

  The hard coat film for insert molding according to the invention of claim 3 is the hard coat film for insert molding according to claim 1 or 2, wherein the transparent base film is a single layer of polymethyl (meth) acrylate. It consists of

  The hard coat film for insert molding according to the invention of claim 4 is the hard coat film for insert molding according to claim 1 or 2, wherein the transparent base film is a polycarbonate layer and a polymethyl (meth) acrylate. The hard coat layer is composed of a plurality of layers, and the hard coat layer is laminated on the side of the polymethyl (meth) acrylate layer.

  The hard coat film for insert molding according to the invention of claim 5 is the hard coat film for insert molding according to any one of claims 1 to 4, wherein the hard coat layer is laminated in two or more layers. The hard coat layer which is the outermost layer is the low refractive index layer.

  The hard coat film for insert molding according to the sixth aspect of the present invention is the hard coat film for insert molding according to the fifth aspect, wherein the low refractive index layer contains fine particles of hollow silica as fine particles. It contains a fluorine acrylic compound.

  The insert-molded product according to the invention described in claim 7 is an insert-molded product provided with the hard coat film for insert molding according to any one of claims 1 to 6. The insert molded product is molded by inserting the hard coating film for insert molding so that the thermoplastic resin is welded to the surface of the hard coat film for insert molding on which the hard coat layer is not provided. It is done.

  The in-vehicle display according to the eighth aspect of the present invention is an in-vehicle display including the insert molding according to the seventh aspect, wherein the hard coat film side for the insert molding of the insert molding forms a surface. The insert molding is incorporated in order to do so.

  In this specification, (meth) acrylate means acrylate or methacrylate.

  According to the hard coat film for insert molding, the insert molded article and the in-vehicle display according to the present invention, a single layer or two or more hard coat layers are laminated on one surface of the transparent substrate film made of thermoplastic resin. By setting the Ra of the outermost surface in the range of 1 to 90 nm and the RSm in the range of 1.0 to 35.0 μm, it is possible to eliminate the occurrence of wrinkling during insert molding, and an image of the insert molding It is possible to eliminate the occurrence of glare on the display.

It is a schematic diagram which shows the hard coat film for insert molding of the structure which laminated | stacked the single-layer hard-coat layer of one embodiment of this invention. It is a schematic diagram which shows the hard coat film for insert molding of the structure which laminated | stacked the two-layer hard-coat layer of other embodiment of this invention. It is a schematic diagram which shows the hard-coat film for insert molding of the structure which laminated | stacked the three-layer hard-coat layer of further another embodiment of this invention. It is a schematic diagram which shows the hard coat film for insert molding of the material of a transparent base film of the further another embodiment of this invention of a polymethyl (meth) acrylate single layer structure. It is a schematic diagram which shows an example of the manufacturing method of the insert molding using a hard-coat film, and shows the state which installed the hard-coat film in the metal mold | die. Similarly, it is a schematic diagram of the longitudinal cross-section in FIG. Similarly, in FIG. 6, it is a schematic diagram which shows the state with which resin is filled. Similarly, it is a schematic diagram of the cross section by the AA in FIG.

  Below, the form for implementing this hard-coat film for insert molding, an insert molding, and a vehicle-mounted display are demonstrated in order based on drawing.

  FIG. 1 shows an embodiment of the present invention. The insert molding hard coat film 1 is a hard coat film used on the surface of a display device, and is a single layer or two or more hard coat layers 3 on one surface of the transparent substrate film 2 made of a thermoplastic resin. (In the illustrated embodiment, a single layer hard coat layer) is laminated. And Ra (arithmetic mean roughness) of the outermost surface of hard court layer 3 is in the range of 1 to 90 nm, and RSm (average length of roughness curvilinear element) is 1.0 to 35.0 μm. In the range. Here, if Ra is smaller than 1 nm, air leakage between the inner surface of the mold and the hard coat layer 3 worsens during insert molding, and the hard coat film 1 for insert molding does not slip, so at the time of insert molding There is a concern about the occurrence of vertical wrinkles in the hard coat film 1. On the other hand, if Ra is larger than 90 nm, the slipperiness with the mold becomes too high, so there is a concern that the same hard coat film 1 may generate lateral wrinkles during insert molding, and by the lens effect due to the uneven shape of the surface, There is a concern that light from an element for displaying a character or an image may be distorted and glare may occur due to a spot of luminance due to the distortion.

  Moreover, RSm (average length of a roughness curvilinear element) of the outermost surface of the hard-coat layer 3 exists in the range of 1.0-35.0 micrometers. If RSm is smaller than 1 μm, the area of contact between the mold and the hard coat layer 3 increases during insert molding, and the hard coat film 1 for insert molding does not slip. There are concerns that arise. On the other hand, if the thickness is larger than 35 μm, the slipperiness with the mold becomes too high, so that there is a concern that the same hard coat film 1 may be wrinkled at the time of insert molding.

  Therefore, by setting the Ra of the outermost surface of the hard coat layer 3 in the range of 1 to 90 nm and the RSm in the range of 1.0 to 35.0 μm, the insert molding hard coat film 1 and the mold in insert molding And the occurrence of longitudinal wrinkles and transverse wrinkles of the insert molding hard coat film 1 can be eliminated. In addition, by suppressing the values of Ra and RSm below a certain level, it is possible to eliminate glare in the image display of the insert-molded product obtained by insert molding. That is, a single layer or two or more hard coat layers 3 are laminated on one surface of the transparent substrate film 2 made of a thermoplastic resin, Ra of the outermost surface is in the range of 1 to 90 nm, and RSm is 1. By setting it as the range of 0-35.0 micrometers, generation | occurrence | production of the wrinkles of the hard-coat film 1 for insert molding can be eliminated at the time of insert molding, and generation | occurrence | production of glare can be eliminated in the image display of an insert molding.

  Specifically, the fine particles 4 are contained in the single layer hard coat layer 3 or in any hard coat layer of two or more hard coat layers (in the illustrated embodiment, in the single layer hard coat layer) The average particle diameter of the particles 4 is in the range of 10 to 400 nm. More specifically, in the single layer hard coat layer 3, fine particles 4 localized on the side opposite to the side on which the transparent substrate film 2 is located (that is, the surface of the hard coat layer 3) are present. Therefore, the fine particles 4 form irregularities on the surface (the outermost surface) of the hard coat layer 3.

  However, the method of forming the unevenness on the surface of the hard coat layer 3 is not particularly limited as long as the above-mentioned range of Ra and Rsm is satisfied. Generally, as described above, the method of making the hard coat layer 3 contain the fine particles 4 is used as a method of forming the unevenness, but as another method, a UV curable resin is used in a mold having fine unevenness. Irregularities may be formed by irradiation of ultraviolet rays while pressing, or may be formed by phase separation of a plurality of polymers. That is, the hard coat layer 3 may not contain the fine particles 4, and as described above, the hard coat layer 3 of a single layer or an optional hard coat layer in a hard coat layer of two or more layers The microparticles | fine-particles 4 which have an average particle diameter in the range of 10-400 nm may be contained in below-mentioned (refer FIGS. 2-4). Of course, the average particle diameter of the fine particles 4 is not limited to this range.

  The material of the transparent substrate film 2 is not particularly limited as long as it is a thermoplastic resin, but it has impact resistance and weather resistance, is highly transparent, and can withstand loads during molding, It is preferred to use polycarbonate or polymethyl (meth) acrylate. In particular, polymethyl (meth) acrylate has good adhesion to the hard coat layer 3 described in detail later, and is suitable as a material of the transparent substrate film 2. In addition, although polycarbonate has very high impact resistance but is inferior in solvent resistance, polycarbonate having a structure in which polymethyl (meth) acrylate is laminated is suitable as the material of the transparent base film 2. Therefore, in the illustrated embodiment, the transparent base film 2 is composed of a plurality of layers of a polycarbonate layer 2a and a polymethyl (meth) acrylate layer 2b, and the hard coat layer 3 is laminated on the side of the polymethyl (meth) acrylate layer 2b. Be done.

  The thickness of the transparent substrate film 2 is preferably in the range of 30 to 500 μm, and more preferably in the range of 75 to 400 μm. If it is smaller than 30 μm, there is a concern that wrinkles will occur in insert molding, and if it is larger than 500 μm, there is a concern that a crack or the like may occur in insert molding. The transparent base film 2 may contain various additives as needed in the range which does not affect the performance. In addition, the surface of the transparent substrate film 2 is subjected to a corona treatment or an easy adhesion coating treatment for the purpose of improving the adhesion with the hard coat layer 3 to be laminated, and for the purpose of removing foreign substances on the surface of the transparent substrate film 2 The surface may be cleaned with water or a solvent.

  The hard coat layer 3 is prepared by applying a coating liquid for a hard coat layer containing fine particles 4 on the side of the polymethyl (meth) acrylate layer 2b of the transparent base film 2, drying it, and irradiating it with ultraviolet light. Be done. Coating is performed, for example, by reverse gravure coating, direct gravure coating, die coating, bar coating, wire bar coating, roll coating, spin coating, dip coating, spray coating, knife coating, kiss coating, etc. Although coating methods like these can be used, it is not limited to these methods.

As the irradiation apparatus of ultraviolet light, an ultraviolet irradiation apparatus using a high pressure mercury lamp, an electrodeless (microwave system) lamp, a xenon lamp, a metal halide lamp and any other arbitrary lamp can be used. Moreover, about the irradiation amount of an ultraviolet-ray, it is good for it to be the range of 50-800 mJ / cm < ² >, preferably the range of 100-300 mJ / cm < ² >.

  The thickness of the hard coat layer 3 is preferably 0.5 to 15 μm, and if it is less than 0.5 μm, sufficient strength can not be obtained, and if it exceeds 15 μm, there is a risk of curling or cracking. is there.

  More specifically, the hard coat layer coating solution is a curable composition for forming the hard coat layer 3 and is preferably curable by ultraviolet light. The composition cured by ultraviolet light is a composition containing a binder (including an ultraviolet-curable compound and a photopolymerization initiator), an additive, and an organic solvent, and as in the illustrated embodiment, the hard coat layer 3 is a single composition. When it is a layer, it is preferable to contain microparticles 4. Here, as the ultraviolet ray curable compound, it is preferable to use, for example, a urethane (meth) acrylate oligomer as a main component which can impart the strength of the hard coat layer 3 and the followability to the mold in insert molding.

  The glass transition point (Tg) of the hard coat film of the hard coat layer 3 is, for example, preferably in the range of 80 to 140 ° C, and more preferably in the range of 95 to 130 ° C. If the glass transition point is too low, there is a possibility that the problem of the strength reduction of the hard coat layer 3 may occur, and if the glass transition point is too high, there is a concern that a crack may easily occur during insert molding.

  The photopolymerization initiator is not particularly limited as long as it is decomposed by ultraviolet irradiation to initiate polymerization, and these photopolymerization initiators may be used alone or in combination of two or more kinds.

  The fine particles 4 are for forming asperities on the surface (the outermost surface) of the hard coat layer 3 as described above. The fine particles 4 are not particularly limited, but, for example, styrene resin, styrene-acrylic copolymer resin, acrylic resin, urethane resin, polyamide resin, epoxy resin, silicone resin, melamine resin, phenol resin, polyethylene resin, etc. The particles used as the material are preferred. In addition to inorganic particles obtained from silica etc., metal oxide particles obtained from aluminum (alumina), titanium (titania), zirconium etc., in addition to the purpose of forming surface irregularities, adjustment of refractive index and coating film strength It can be used preferably for the purpose of improving the

  The average particle diameter of the fine particles 4 is preferably in the range of 10 to 400 nm, more preferably in the range of 30 to 400 nm, and these fine particles 4 form surface irregularities. When the average particle size exceeds 400 nm, it is difficult to adjust the surface irregularities to be formed to a suitable value for both Ra and RSm, and there is a possibility that glare may occur or slipperiness may not be appropriate. Here, the average particle diameter is an arithmetic mean value of volume-based particle size distribution obtained by laser diffraction / scattering method according to Japanese Industrial Standard JIS Z8825 based on International Standardization Mechanism Standard ISO 13320.

  It is preferable to use a leveling agent in the coating solution for the hard coat layer in order to improve wettability during coating and to prevent interference and cissing. Moreover, the improvement of the dispersibility of the microparticles | fine-particles 4 contained in the hard-coat layer 3 can also be anticipated by addition of a leveling agent. As this leveling agent, although a silicone type and a fluorine type leveling agent can be used, for example, a fluorine type leveling agent is more preferable. The fluorine-based leveling agents include oligomers containing a fluoro group, a hydrophilic group, an oleophilic group, an ultraviolet reactive group, and the like, and as a commercial product, for example, OPTOOL (manufactured by Daikin Industries, Ltd., trade name), Made by Neos, Inc. (trade name), KY-1200 series (made by Shin-Etsu Chemical Co., Ltd., trade name), etc. are known. By using a fluorine-based leveling agent, fingerprint resistance is expressed, and when using the hard coat film 1 for in-vehicle use, it is possible to prevent the fingerprint from being attached by operation of the navigation screen or the like to reduce the visibility. it can.

  The content of the leveling agent in the hard coat layer coating solution is preferably 0.05 to 5% by weight, and more preferably 0.15 to 3% by weight, with respect to the binder. If the leveling agent is less than 0.05% by weight, a smooth film surface can not be obtained, and if it exceeds 5% by weight, there is a risk of foaming of the coating solution or whitening of the coated film.

  The hard coat layer coating solution contains an organic solvent. The hard coat layer 3 is formed by dissolving or dispersing the binder, the fine particles 4 and the leveling agent with the organic solvent. The coating liquid of Moreover, the film thickness of the hard-coat layer 3 containing the microparticles | fine-particles 4 can be suitably adjusted by diluting a coating liquid using an organic solvent.

  Examples of the organic solvent include alcohol-based organic solvents such as isopropyl alcohol (IPA), ethylene glycol monomethyl ether, propylene glycol monomethyl ether (PGM), and diethylene glycol monobutyl ether, methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), Ketone organic solvents such as cyclohexanone (anone), acetone etc., ester organic solvents such as butyl acetate, ethyl acetate, ethyl lactate, propylene glycol monomethyl ether acetate etc., aromatics such as toluene, xylene etc Organic solvents and amide organic solvents such as N-methyl pyrrolidone, dimethyl acetamide, dimethylformamide and the like can be used.

  The present invention is not limited to the embodiments described above. For example, two or more hard coat layers 3 to be laminated on the transparent base film 2 may be laminated. In this case, it is preferable that the hard coat layer 3 which is the outermost layer have a characteristic showing a low refractive index (hereinafter, the low refractive index layer 3b). Thus, by laminating the low refractive index layer 3b, it is possible to lower the reflectance, and when used in a vehicle interior, it is possible to prevent glare due to reflection of external light. In addition, in the case where two or more hard coat layers 3 are laminated in this manner, one of the hard coat layers 3 may contain the fine particles 4. Then, by setting the average particle diameter of the particles 4 in the range of 10 nm to 400 nm, it is possible to obtain 1 to 90 nm of Ra of the outermost surface of the hard coat layer 3 and 1.0 to 35.0 μm of RSm. Make it

  FIG. 2 shows the case where the insert molding hard coat film 1 has two hard coat layers 3, and on the transparent substrate film 2, the first coat of the hard coat layer 3 a and the low refraction of the second layer. The rate layer 3b is stacked.

  The hard coat layer 3a of the first layer is the same as the hard coat layer 3 shown in FIG. 1 but does not contain fine particles. Fine particles 4 are contained in the low refractive index layer 3 b of the second layer. The film thickness of the low refractive index layer 3b is preferably in the range of 30 to 200 nm, and particularly preferably in the range of 80 to 110 nm. If the film thickness is less than 30 nm or more than 200 nm, the effect of reducing surface reflection is significantly reduced.

  Here, the low refractive index layer 3 b is formed of a binder, the fine particles 4 and a fluorine-containing acrylic compound (leveling agent). The binder is necessary for immobilizing the fine particles 4 and forming surface irregularities having desired Ra and RSm, and is used for forming the above-mentioned hard coat layer 3 as an ultraviolet-curable compound contained in the binder An ultraviolet curable compound can be blended.

  Among the fine particles 4 described above, it is preferable to use hollow silica among the fine particles 4 described above in order to maintain the hardness and adjust the refractive index to be low, in addition to forming the surface irregularities. Further, the refractive index of the low refractive index layer 3b needs to be lower than the refractive index of the hard coat layer 3a, and the refractive index is preferably 1.42 or less. When it exceeds 1.42, the effect of reducing surface reflection is significantly reduced. In addition, the refractive index of the hard coat layer 3a is preferably in the range of 1.49 to 1.59.

  Moreover, a fluorine-containing acrylic compound expresses fingerprint resistance, and when using hard coat film 1 for insert molding in in-vehicle use, it prevents that a fingerprint adheres by operation of a navigation screen etc., and visibility falls. Can. As a fluorine-containing acrylic compound, the thing of the same kind as the leveling agent of the above-mentioned hard-coat layer 3 can be used.

  FIG. 3 and FIG. 4 show the case where the hard coat film 1 for insert molding has three hard coat layers 3, and on the transparent substrate film 2, the refractive index is high, and the high refractive index layer 3 c> hard coat layer 3a> The hard coat layer 3a of the first layer, the high refractive index layer 3c of the second layer, and the low refractive index layer 3b of the third layer, which will be the low refractive index layer 3b, are sequentially stacked.

  The hard coat layer 3a of the first layer and the low refractive index layer 3b of the third layer are the same as those shown in FIG. The high refractive index layer 3c of the second layer is for adjusting the refractive index, and by interposing the high refractive index layer 3c between the hard coat layer 3a and the low refractive index layer 3b, The reflectance decreases.

  The high refractive index layer 3c contains metal oxide fine particles in order to secure a predetermined refractive index, and the metal oxide fine particles are particularly limited as long as they have light permeability and the refractive index can be adjusted. Although not preferred, zirconium oxide and titanium oxide are particularly preferred. In addition, in FIG. 4, the transparent base film 2 consists of a single | mono layer. Thus, when the transparent base film 2 has a single layer structure, the material of the single layer is preferably polymethyl (meth) acrylate.

  The insert molding is provided with the above-mentioned hard coat film 1 for insert molding, although not shown. This insert-molded product is formed by inserting the hard coating film 1 for insert molding so that the thermoplastic resin is welded to the surface of the hard coat film 1 for insert molding on which the hard coat layer 3 is not provided. It is done.

  In detail, the hard coat film 1 for insert molding is shaped by warm press molding in a pre-molding process. Thereafter, the shaped hard coat film for insert molding 1 is held in the injection molding die and the molten thermoplastic resin is poured from the back surface to thereby insert the hard coat film for insert molding 1 and the thermoplastic resin. An insert-molded product is obtained. However, depending on the insert-molded product, the film may be inserted as it is into an injection mold and insert-molded without shaping the hard coat film 1 for insert molding.

  As this thermoplastic resin, for example, transparent resins such as polyethylene terephthalate, polymethyl (meth) acrylate, polystyrene, and polycarbonate can be used.

  The in-vehicle display includes the insert-molded product, and the insert-molded product is incorporated such that the insert-molded hard coat film 1 side of the insert-molded product forms a surface. However, the insert molding may be widely incorporated in display devices such as various displays as well as in-vehicle displays.

  Hereinafter, the present invention will be described in detail by way of examples. In the following examples, film properties were measured and evaluated by the following methods.

(1) Ra (arithmetic mean roughness), RSm (mean length of roughness curve element)
Using a white light interferometer (manufactured by Ryoka System, trade name: VertScan / model: R5300GL-L-A100-AC), place the sample cut out at 10 x 10 cm on the stage, and use a 50x lens to set Ra and RSm Was calculated.

(2) Dynamic friction coefficient Using a tensile tester (trade name: Autograph AGS-X-1KN, manufactured by Shimadzu Corporation), the test speed is 100 mm / sec, the area of 60 mm × 50 mm in the friction direction is 4.4 kg vertically The coefficient of dynamic friction of the surface of the hard coat film for insert molding was measured when PET (Toyobo Co., Ltd., A4100 / 188μ easy-to-adhesion layer untreated surface) was used as an opposite material to be subjected to load and friction.

(3) Horizontal wrinkles, vertical wrinkles A thermoplastic resin melted at a temperature of about 300 ° C. with a pressure of 60 MPa, with the hard coat film for insert molding placed on the cavity surface of the injection molding die heated to 105 ° C. At the same time, it was injected into the mold to prepare an insert molding, and the occurrence of surface wrinkles was visually determined. Those with no wrinkles at all were marked with ○, and those with vertical and horizontal wrinkles were marked with x.

(4) The full screen of the high definition display tablet (Apple Inc., trade name: iPad) is displayed in green, and the hard coat layer side of the insert molding hard coat film to be evaluated is placed on top. The glaring was visually judged. A sample in which no glare was observed was rated as も の, and a sample in which slight glare was recognized was rated as x.

Example 1
(Adjustment of hard coat layer coating liquid (1))
PGM (propylene glycol monomethyl ether) is added to a UV-curable resin composition Z-607-5L (Aika Kogyo Co., Ltd., solid content concentration 30% by weight) so that the solid content concentration becomes 25% by weight, and a hard coat layer Coating solution (1) was obtained.

(Adjustment of coating solution (1) for low refractive index layer)
Ultraviolet curable resin composition ELCOM P-5062 (manufactured by JGC Catalysts Chemical Co., Ltd., solid content concentration 3% by weight, average particle size 60 nm) containing 100 parts by weight of hollow silica fine particles as fine particles 4 as a fluorine-containing acrylic compound 0.6 parts by weight of KY-1203 (Shin-Etsu Chemical Co., Ltd., solid content 20% by weight) is added, IPA (isopropyl alcohol) is added so that the solid concentration is 2.5% by weight, and a low refractive index layer Coating solution (1) was obtained.

(Preparation of hard coat film (1) for insert molding)
The transparent base film 2 having a two-layer structure of a polycarbonate layer 2 a and a polymethyl methacrylate layer 2 b as a transparent base film 2 made of a thermoplastic resin (Escarbo Sheet Co., Ltd., “Technoloy C 003”, 300 μm thick) The hard coat layer coating solution (1) is applied onto the methyl methacrylate layer 2b using a # 10 wire bar so that the film thickness of the hard coat layer 3a after curing becomes 3.5 μm, 100 ° C. After drying for 1 minute, the hard coat layer 3a was formed by curing by irradiation with ultraviolet light of 200 mJ / cm ^{2 with} a 160 W high pressure mercury lamp. Next, using a # 4 wire bar for the low refractive index layer coating solution (1) on the hard coat layer 3a, the film thickness of the low refractive index layer 3b after curing will be 0.1 μm. And dried at 80 ° C. for 1 minute, and then irradiated with ultraviolet light with a light quantity of 200 mJ / cm ^{2 with} a 160 W high pressure mercury lamp in a nitrogen atmosphere for curing to form a low refractive index layer 3 b, and insert molding Hard coat film (1) was produced.

Example 2
(Adjustment of hard coat layer coating liquid (2))
UV-curable resin composition Z-607-5L (Aika Kogyo Co., Ltd., solid content concentration 30% by weight), relative to 100 parts by weight, KY-1203 (Shin-Etsu Chemical Co., Ltd., solid content) as a fluorine-based leveling agent 0.15 parts by weight of a concentration of 20% by weight, and 5 parts by weight of AB agent 1 (manufactured by Aika Kogyo Co., Ltd., solid content 15% by weight, average particle diameter 250 nm) containing fine particles 4 PGM (propylene glycol monomethyl ether) was added thereto to obtain a hard coat layer coating solution (2).

(Preparation of Hard Coat Film for Insert Molding (2))
The transparent base film 2 having a two-layer structure of a polycarbonate layer 2 a and a polymethyl methacrylate layer 2 b as a transparent base film 2 made of a thermoplastic resin (Escarbo Sheet Co., Ltd., “Technoloy C 003”, 300 μm thick) The hard coat layer coating solution (2) is applied onto the methyl methacrylate layer 2b using a # 10 wire bar so that the film thickness of the hard coat layer 3 after curing becomes 3.5 μm, 100 ° C. After drying for 1 minute, the hard coat layer 3 was formed by irradiating and curing an ultraviolet ray with a light quantity of 200 mJ / cm ^{2 with} a 160 W high pressure mercury lamp to produce a hard coat film for insert molding (2).

Example 3
(Adjustment of hard coat layer coating liquid (3))
Example 2 is the same as Example 2, except that AB agent 1 containing fine particles 4 (Aika Kogyo Co., Ltd., solid content concentration 15% by weight, average particle diameter 250 nm) is 8 parts by weight. A hard coat layer coating solution (3) was obtained.

(Preparation of Hard Coat Film for Insert Molding (3))
A hard coat film for insert molding (3) is prepared in the same manner as in Example 2 except that the hard coat layer coating solution (2) in Example 2 is changed to the hard coat layer coating solution (3). Made.

Example 4
(Adjustment of hard coat layer coating liquid (4))
Example 2 is the same as Example 2 except that AB agent 1 containing fine particles 4 (Aika Kogyo Co., Ltd., solid content concentration 15% by weight, average particle diameter 250 nm) is 12 parts by weight. A hard coat layer coating solution (4) was obtained.

(Production of hard coat film (4) for insert molding)
A hard coat film (4) for insert molding is prepared in the same manner as in Example 2 except that the hard coat layer coating solution (2) in Example 2 is changed to the hard coat layer coating solution (4). Made.

Example 5
(Adjustment of hard coat layer coating liquid (5))
Example 2 Z607ALU (Aika Kogyo Co., Ltd., solid) containing 5 parts by weight of AB agent 1 (Aika Kogyo Co., Ltd., solid content concentration 15% by weight, average particle diameter 250 nm) and alumina particles as fine particles 4 A coating solution (5) for a hard coat layer was obtained in the same manner as in Example 2 except that the component concentration was 30% by weight, and the average particle diameter was 32 nm).

(Preparation of hard coat film (5) for insert molding)
A hard coat film for insert molding (5) is prepared in the same manner as in Example 2 except that the hard coat layer coating solution (2) in Example 2 is changed to the hard coat layer coating solution (5). Made.

Example 6
(Adjustment of low refractive index layer coating liquid (6))
In Example 1, 0.0033% by weight of acrylic fine particles (manufactured by Soken Chemical Co., Ltd., acrylic particles MX-40, average particle diameter 400 nm) was further added as the fine particles 4 to the low refractive index layer coating solution (1) A low refractive index layer coating solution (6) was obtained in the same manner as Example 1 except for the above.

(Preparation of hard coat film (6) for insert molding)
A hard coat film for insert molding (6 in the same manner as in Example 1 except that the low refractive index layer coating liquid (1) in Example 1 was changed to the low refractive index layer coating liquid (6). ) Was produced.

Example 7
(Adjustment of coating liquid (7) for low refractive index layer)
In Example 1, except that 0.080% by weight of acrylic fine particles (manufactured by Soken Chemical Co., Ltd., MX-40, average particle diameter 400 nm) was further added as the fine particles 4 to the low refractive index layer coating solution (1) The same manner as in Example 1 was carried out to obtain a low refractive index layer coating liquid (7).

(Preparation of hard coat film (7) for insert molding)
A hard coat film for insert molding (7) in the same manner as in Example 1 except that the low refractive index layer coating liquid (1) in Example 1 was changed to the low refractive index layer coating liquid (7). ) Was produced.

Comparative Example 1
(Adjustment of hard coat layer coating liquid (8))
UV-curable resin composition Z-607-5L (Aika Kogyo Co., Ltd., solid content concentration 30% by weight), relative to 100 parts by weight, KY-1203 (Shin-Etsu Chemical Co., Ltd., solid content) as a fluorine-based leveling agent 0.15 parts by weight of a concentration of 20% by weight) was added, and PGM (propylene glycol monomethyl ether) was added so as to obtain a solid content concentration of 25% by weight, to obtain a coating solution (8) for a hard coat layer.

(Preparation of hard coat film (8) for insert molding)
A hard coat film (8) for insert molding is prepared in the same manner as in Example 2 except that the hard coat layer coating solution (2) in Example 2 is changed to the hard coat layer coating solution (8). Made.

Comparative Example 2
(Adjustment of hard coat layer coating liquid (9))
Comparative Example 1 is the same as Comparative Example 1 except that 7 parts by weight of Z-AGD-6 (Aika Kogyo Co., Ltd., solid content concentration 15% by weight, average particle diameter 2.2 μm) containing fine particles 4 is added. Thus, a hard coat layer coating solution (9) was obtained.

(Preparation of hard coat film (9) for insert molding)
A hard coat film (9) for insert molding is prepared in the same manner as in Comparative Example 1 except that the hard coat layer coating liquid (8) in Comparative Example 1 is changed to the hard coat layer coating liquid (9). Made.

Comparative Example 3
(Adjustment of coating liquid (10) for low refractive index layer)
In Example 1, except that 0.008% by weight of acrylic fine particles (manufactured by Soken Chemical Co., Ltd., MX-80Tw3, average particle diameter 800 nm) was further added as the fine particles 4 to the low refractive index layer coating solution (1) In the same manner as in Example 1, a coating solution (10) for low refractive index layer was obtained.

(Preparation of hard coat film (10) for insert molding)
A hard coat film for insert molding (10 in the same manner as in Example 1 except that the low refractive index layer coating liquid (1) in Example 1 was changed to the low refractive index layer coating liquid (10). ) Was produced.

  The characteristics and evaluation results of the hard coat films for insert molding obtained in Examples 1 to 7 and Comparative Examples 1 to 3 are shown in Table 1.

  The insert molding of the hard coat film for insert molding obtained in Examples 1 to 7 has neither longitudinal wrinkles nor lateral wrinkles, and no occurrence of glare is recognized.

  Since the insert molding of the hard coat film for insert molding obtained in Comparative Example 1 has an Ra of less than 1 nm and an RSm of less than 1 μm, the slipperiness in the mold is insufficient, and the generation of longitudinal wrinkles occurs. there were.

  Since the insert molding of the hard coat film for insert molding obtained in Comparative Example 2 has an Ra of greater than 90 nm, the slipperiness in the mold is excessive, and there are occurrences of lateral wrinkles, and the occurrence of glittering Was also recognized.

  Although the insert molding of the hard coat film for insert molding obtained in Comparative Example 3 did not have longitudinal wrinkles and lateral wrinkles, glare had occurred.

1 hard coat film for insert molding 2 transparent base film 2a polycarbonate layer 2b polymethyl (meth) acrylate layer 3 hard coat layer 3a hard coat layer 3b low refractive index layer 3c high refractive index layer 4 fine particles

Claims (8)

A hard coat film for insert molding used for the surface of a display device, wherein a single layer or two or more hard coat layers are laminated on one surface of a transparent substrate film made of a thermoplastic resin.
The Ra (arithmetic mean roughness) of the outermost surface of the hardcoat layer is in the range of 1 to 90 nm, and the RSm (average length of the roughness curvilinear element) is in the range of 1.0 to 35.0 μm There is a hard coat film for insert molding.   The fine particles are contained in the single layer hard coat layer or any hard coat layer of the two or more hard coat layers, and the average particle size of the fine particles is in the range of 10 to 400 nm. Hard coat film for insert molding as described.   The hard coat film for insert molding according to claim 1, wherein the transparent base film is composed of a single layer of polymethyl (meth) acrylate.   The said transparent base film consists of multiple layers of a polycarbonate layer and a polymethyl (meth) acrylate layer, and the said hard-coat layer is laminated | stacked on the side of the polymethyl (meth) acrylate layer. Hard coat film for insert molding.   The hard coat film for insert molding according to any one of claims 1 to 4, wherein the hard coat layer is laminated in two or more layers, and the hard coat layer to be the outermost layer is a low refractive index layer.   The hard coat film for insert molding according to claim 5, wherein the low refractive index layer contains fine particles of hollow silica as fine particles and a fluorine-containing acrylic compound. An insert molded article comprising the hard coat film for insert molding according to any one of claims 1 to 6,
The insert molding is formed by inserting the hard coat film for insert molding so that a thermoplastic resin is welded to the surface of the hard coat film for insert molding on which the hard coat layer is not provided. object. An in-vehicle display comprising the insert molding according to claim 7, wherein
An in-vehicle display, wherein the insert-molded product is incorporated such that the insert molded hard coat film side of the insert-molded product forms a surface.

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