JP2001315263A - Hard coat sheet, resin molded product using the same, and method of manufacturing the same - Google Patents

Abstract

(57) [Problem] To provide a hard coat sheet having sufficient surface hardness and weather resistance, a resin molded article having satisfactory surface hardness and weather resistance imparted thereby, and a method for producing the same. SOLUTION: A hard coat sheet in which a silicone-based hard coat film having a thickness of 2 to 7 μm is laminated on one side of an acrylic resin sheet containing 0.05 to 10% by weight of an ultraviolet absorber, and a hard coat treatment layer comprising the hard coat sheet A resin molded product laminated and integrated with a thermoplastic resin molded product as the outer layer. This resin molded product is manufactured by mounting a hard coat sheet in the mold of an injection molding machine so that the hard coat treatment layer becomes the outer layer, then injection molding the thermoplastic resin in the molten state and laminating and integrating it. Is done.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a hard coat sheet having a hard coat layer formed on an acrylic resin sheet. Furthermore, the present invention relates to a thermoplastic resin molded product used for applications requiring scratch resistance and weather resistance.

[0002]

2. Description of the Related Art Resin molded articles are inexpensive, lightweight, moldable,
Utilizing features such as excellent impact resistance, building materials, industrial materials,
Widely used for automotive parts. However, resin molded products generally have low surface hardness, and the surface is damaged due to scratching at the time of product processing, mounting, or at the stage of using equipment or the like equipped with these resin parts, resulting in a decrease in yield, There is a problem that the product value is likely to be reduced.

Further, many resin molded products are inferior in terms of weather resistance, and are deteriorated in appearance due to light deterioration or hydrolysis, etc., and deteriorate physical properties such as impact resistance. Limited. As a means for improving these drawbacks, a method of applying a hard coat treatment to the surface of a resin molded product or a method of attaching a hard coat sheet to the surface has been studied. For example, Japanese Patent Application Laid-Open No. 52-126
No. 47 and Japanese Patent Application Laid-Open No. 56-92059, etc., apply an acrylate-based or silicone-based crosslinked film-forming material to the surface of a molded resin article by dip coating, spray coating, or the like, UV light,
A method of performing a hard coat treatment for curing by energy such as heat is disclosed. However, these methods have problems such as difficulty in application due to the shape of the molded article, occurrence of poor appearance due to dust at the time of application, and low productivity. Furthermore, Japanese Patent Publication 4-215
No. 88 or JP-A-8-309790, a polycarbonate sheet having a hard coat treatment on one side is mounted in a mold, and the other resin is laminated and integrated by injection molding. There is also known a method for improving the surface hardness. However, in this method, since a hard coat treatment is performed on the polycarbonate sheet, it is necessary to form a primer or an adhesive layer made of an acrylic resin or the like in a separate step, and there is a problem that the step is complicated. Further, the weather resistance of the obtained product was not sufficient.

[0004]

SUMMARY OF THE INVENTION The present invention provides a hard coat sheet having sufficient surface hardness and weather resistance, a resin molded product having satisfactory surface hardness and weather resistance imparted thereby, and a method for producing the same. What you want to do. The present inventors have conducted intensive studies to solve the problems of the prior art as described above, and as a result, after performing a specific hard coat treatment on one surface of an acrylic resin sheet containing an ultraviolet absorber, integrally forming with a transparent resin. By doing so, it has been found that sufficient surface hardness and weather resistance can be simultaneously imparted to a resin molded product, and the present invention has been completed.

[0005]

That is, according to the present invention, a silicone-based hard coat film having a thickness of 2 to 7 μm is laminated on one surface of an acrylic resin sheet containing 0.05 to 10% by weight of an ultraviolet absorber. Provide a hard coat sheet. The present invention also provides an ultraviolet absorber in an amount of 0.05 to 10
2% by weight on one side of an acrylic resin sheet containing
Provided is a resin molded product in which a hard coat sheet on which a 7 μm silicone-based hard coat film is laminated is laminated and integrated with a thermoplastic resin molded product using a hard coat treatment layer as an outer layer.

[0006] The present invention also relates to an ultraviolet absorber of 0.05%.
On one side of an acrylic resin sheet containing 10 to 10% by weight, the thickness of the silicone hard coat liquid after curing treatment is 2 to 7
a hard coat sheet coated at a temperature not exceeding 10 ° C. higher than the thermal deformation temperature of the acrylic resin sheet in the range of 70 to 130 ° C. and a low load based on ASTM-D648, Provided is a method for producing a resin molded product, which comprises mounting a hard coat treatment layer in a mold of an injection molding machine so as to be an outer layer, and then injecting, molding and laminating and integrating a thermoplastic resin in a molten state. .

[0007] The present invention further relates to an ultraviolet absorbent,
On one side of an acrylic resin sheet containing 5 to 10% by weight,
Silicone hard coat liquid has a thickness of 2 after curing
7 μm, dried until the surface of the coating film has no tackiness, and dried and uncured sheet which has not been subjected to curing treatment is placed in a mold of an injection molding machine so that the hard coat treatment layer becomes an outer layer. A resin molded product which is mounted, then injected and molded with a molten thermoplastic resin, laminated and integrated, is further subjected to a heat deformation temperature of the acrylic resin sheet in a range of 70 to 130 ° C. and a low load based on ASTM-D648. A method for producing a resin molded product, comprising post-curing at a temperature not higher than 10 ° C. higher.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
Examples of the acrylic resin sheet used in the present invention include, for example, JP-A-8-323934 and JP-A-10-27.
9766, JP-A-10-306192, JP-A-11-147237 and the like, that is, a homopolymer or copolymer of an acrylate or methacrylate having 1 to 8 carbon atoms in an alkyl group, A multilayer acrylic polymer containing a rubber elastic layer, or a mixture thereof, particularly preferably a multilayer acrylic polymer containing a rubber elastic layer alone, or a multilayer acrylic polymer containing a rubber elastic layer and an alkyl group A mixture of a acrylate or methacrylate homopolymer or copolymer having 1 to 8 carbon atoms with another additive, if necessary, is then subjected to an extrusion casting method using a chill roll. Extrusion molding method that forms by contacting the sheet, belt cooling that forms by contacting both sides of the sheet with the metal belt Extrusion method, an inflation extrusion molding method, it is possible to use those produced by a known method such as solvent casting method.

The thickness of the acrylic resin sheet used in the present invention is usually 30 to 1000 μm, preferably 50 to 30 μm.
0 μm, most preferably 50 to 150 μm. If the thickness is less than 30 μm, it is difficult to handle, and if the thickness is more than 1000 μm, it may be difficult to follow the molding die during integration with the resin molded product. The acrylic resin sheet contains an ultraviolet absorber for the purpose of shielding ultraviolet rays and improving weather resistance. By doing so, it is possible to effectively impart weather resistance to the resin molded product without impairing other physical properties.

As the ultraviolet absorber to be contained, benzotriazole compounds, benzophenone compounds, benzoate compounds, cyanoacrylate compounds and the like can be mentioned. Specifically, 2- (2′-hydroxy-5 ′)
-Tert-butylphenyl) benzotriazole, 2
-(2'-hydroxy-3 ', 5'-di-tert-butylphenyl) benzotriazole, 2- (2'-hydroxy-3'-tert-butyl-5'-methylphenyl) -5-chlorobenzotriazole , 2- (2'-hydroxy-3 ', 5'-tert-butylphenyl)-
5-chlorobenzotriazole, 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2,
2-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazole-2-
Yl) phenol], 2-hydroxybenzophenone,
5-chloro-2-hydroxybenzophenone, 2,4-
Dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, 4-dodecyloxy-2-hydroxybezophenone, 2,2′-dihydroxy-4-methoxybenzophenone, 2, 2'-dihydroxy-4,
4'-dimethoxybenzophenone, 2-hydroxy-4
-Dodecyloxybenzophenone, phenyl salicylate, p-tert-butylphenyl salicylate, 3-
Hydroxyphenyl benzoate, phenylene-1,3
-Benzoate, 2-ethylhexyl-2-cyano-
3,3'-diphenyl acrylate, ethyl-2-cyano-3,3'-diphenyl acrylate and the like can be mentioned.

The content of the ultraviolet absorber in the acrylic resin sheet is based on 100 parts by weight of the acrylic resin.
The amount is preferably 0.05 to 10 parts by weight, particularly preferably 0.05 to 5 parts by weight. If the amount is less than 0.05 part by weight, sufficient weather resistance may not be imparted, and if the amount is more than 10 parts by weight, the ultraviolet shielding ability is saturated, and not only does the economic efficiency decrease, but also the sheet It is not preferable because bleeding of the ultraviolet absorber or the like easily causes roll contamination and a reduction in the appearance of the product during the production, and the surface hardness of the resin molded product to which the sheet is bonded tends to decrease.

In the present invention, in order to achieve high weather resistance, the most preferable range of the content of the ultraviolet absorbent in the acrylic resin sheet is a range satisfying the following formula among the above ranges. [UV absorber content / sheet weight] × [sheet thickness (unit μm)] ≧ 0.4 In the present invention, for the purpose of improving weather resistance,
A hindered amine light stabilizer may be used in combination with the ultraviolet absorber.

In the present invention, a silicone-based hard coat film formed as a hard coat film on an acrylic resin sheet is disclosed in, for example, JP-A-53-130732.
JP-A-56-92059, JP-A-11-5865
No. 4, JP-A-11-293197, etc., and an acrylic resin sheet comprising a composition comprising an organoalkoxysilane and colloidal silica as main components and a curing catalyst or a solvent blended therein. It is obtained by coating on top and drying. In the present invention, among them, it is particularly preferable to use a composition containing organoalkoxysilane and colloidal silica as main components and blending a curing catalyst and a solvent. Such silicone-based hard coat compositions include, for example, “KP-851” and “X-12-2206” manufactured by Shin-Etsu Chemical Co., Ltd.
"Tosgard 510" manufactured by Toshiba Silicone Co., Ltd. "Solgard NP-72" manufactured by Dacro Shamrock Japan
0 "and" Solgard NP-730 ". As a method for applying such a composition, known methods such as spraying, dipping, flow, roll coating, die coating, gravure coating and the like can be mentioned.

The thickness of the hard coat film must be in the range of 2 to 7 μm, particularly preferably in the range of 2 to 5 μm. When the thickness of the hard coat film is less than 2 μm, sufficient surface hardness cannot be obtained, and when the thickness is more than 7 μm, the flexibility of the coating film is reduced and cracks occur due to bending or the like. In the process of heat-sealing a resin molded product so that the hard coat treatment layer becomes the outer layer or mounting it in a mold of an injection molding machine, then injecting and molding a molten thermoplastic resin, laminating and integrating It is not preferable because cracks are easily generated.

These silicone hard coat films are:
Although good adhesion is exhibited without a primer on the acrylic resin sheet, a primer layer may be provided between the acrylic resin sheet and the silicone-based hard coat film if necessary. The resin constituting the resin molded product having excellent surface hardness of the present invention may be any resin that can be integrally molded with a hard coat sheet, and specifically, various engineering plastics such as polycarbonate resin, acrylic resin, ABS, and the like. Resins, thermoplastic resins such as polystyrene resins and vinyl chloride resins, and mixtures thereof.

As a method of laminating and integrating the hard coat sheet of the present invention with a resin molded product, the hard coat sheet is mounted in a cavity of a mold so that the hard coat layer of the hard coat sheet becomes an outer layer, and the resin is integrated with the resin. Is injected at high pressure. Another example is a method of thermally laminating the resin sheet with a known method. At this time, the silicone-based hard coat film on the acrylic resin sheet to be used may be one that has been dried only after application until the surface of the coating film has no tackiness, and then 70 to 130 ° C.
And a curing treatment at a temperature not exceeding 10 ° C. higher than the thermal deformation temperature of the acrylic resin sheet under a low load based on ASTM-D648. A sheet that has been dried only until the surface of the coating film has no tackiness is preferable because the coating film has high flexibility and is less likely to be cracked by bending. In this case, the dried uncured sheet is mounted in a mold of an injection molding machine so that the hard coat treatment layer becomes an outer layer, and then a thermoplastic resin in a molten state is injected, molded, and laminated and integrated. The molded article is further treated in the range of 70 to 130 ° C. and A
At a temperature not exceeding 10 ° C. higher than the thermal deformation temperature of the acrylic resin sheet under a low load based on STM-D648, more preferably at a temperature in the range of 80 to 105 ° C.,
By post-curing for 30 to 200 minutes, a resin molded product having a high surface hardness can be obtained. Post-curing temperature is 70 ° C
If the temperature is lower than the above, an extremely long treatment is required until the surface hardness becomes higher. If the temperature is higher than 130 ° C. or 10 ° C. higher than the heat deformation temperature of the acrylic resin sheet at a low load based on ASTM-D648. Cracks easily occur on the coating film surface.

At a temperature within the range of 70 to 130 ° C. and not exceeding 10 ° C. higher than the thermal deformation temperature of the acrylic resin sheet under a low load based on ASTM-D648, more preferably at a temperature in the range of 80 to 105 ° C. ,
When a hard coat sheet cured for 30 to 200 minutes is used, it is mounted in a mold of an injection molding machine so that a hard coat treatment layer becomes an outer layer, and then a thermoplastic resin in a molten state is injected, molded, and laminated. A resin molded product having a high surface hardness can be obtained only by integrating. If the temperature at which the dried and uncured sheet is cured beforehand is lower than 70 ° C., an extremely long treatment is required until the surface hardness becomes high, and 130
If the temperature is not higher than 10 ° C. or higher than the thermal deformation temperature of the acrylic resin sheet under a low load based on ASTM-D648, the sheet is likely to deform, which is not preferable.

[0018]

The present invention will be further described below with reference to examples and comparative examples. In the examples, "parts" means parts by weight. Also,
The measurements and evaluations shown in the examples were performed by the following methods. 1. Appearance, etc. Regarding the appearance of the produced hard coat sheet or resin molded product, the presence or absence of cracks in the coating film was observed.

2. Scratch resistance # 000 steel wool was mounted on a circular pad having a diameter of 1 inch, and the pad was placed on the surface of a sample held on a reciprocating abrasion tester table. The pad was reciprocated 100 times under a load of 1000 g to scratch. After washing this sample with ethanol, the haze value was measured with a haze meter. The numerical value represented by (haze value after abrasion)-(haze value before abrasion) was shown as abrasion resistance (%).

3. Abrasion resistance A Taber abrasion test was performed using a single wheel 5 using a wear wheel CS-10F.
The test was performed under the conditions of a load of 00 g and 500 rotations. After washing this sample with ethanol, the haze value was measured with a haze meter. The numerical value represented by (haze value after test)-(haze value before test) was shown as abrasion resistance (%).

4. Adhesion of coating film In the coating film of the sample, scratches reaching the substrate 11 by 11 mm in length and width at 1 mm intervals with a cutter to make 100 grids,
After closely attaching a cellophane adhesive tape (manufactured by Nichiban Co., Ltd.), the cellophane adhesive tape was rapidly peeled off 45 ° in front. After performing this test three times, the number of squares (n) where the coating remained without peeling
Was expressed as n / 100.

5. Weather resistance Sunshine weather meter (manufactured by Suga Test Instruments Co., Ltd.)
The appearance of the resin molded product and the adhesion of the coating film were evaluated after 3000 hours of exposure at a black panel temperature of 63 ° C. and rain (dry 48 minutes, wet 12 minutes cycle). In a reaction vessel for producing a multi-layer acrylic polymer including a rubber elastic layer, 300 parts of deionized water, 0.5 part of N-acyl sarcosine acid, 1.0 part of boric acid, 0.1 part of sodium carbonate
Parts, sodium formaldehyde sulfoxylate 0.5
Parts, 0.00024 parts of ferrous sulfate, 0.00072 parts of disodium ethylenediaminetetraacetate, 40 parts of butyl acrylate, 9.5 parts of styrene, 0.5 parts of allyl methacrylate, and 0.15 parts of cumene hydroperoxide. The raw materials were charged, and polymerization was carried out in a nitrogen atmosphere while stirring at 80 ° C. for 90 minutes. Next, 40 parts of butyl acrylate, 9.5 parts of styrene, 0.5 part of allyl methacrylate, and 0.1 part of cumene hydroperoxide
Five parts of the raw material were continuously added over 90 minutes, and polymerization was further performed for 120 minutes to obtain an elastic latex.

Subsequently, a mixture of 5 parts of deionized water and 1.2 parts of N-acyl sarcosine acid was added to the obtained elastic latex, and the mixture was stirred.
A raw material mixture of 6.6 parts, 3.2 parts of ethyl acrylate, 0.28 parts of n-octyl mercaptan and 0.24 parts of cumene hydroperoxide was continuously added at 80 ° C. over 45 minutes, and then further at 80 ° C. For 1 hour to obtain a multilayer acrylic polymer latex containing a rubber elastic layer.

Thereafter, this latex was subjected to coagulation, coagulation and solidification reactions using calcium chloride, followed by filtration, washing with water and drying to obtain a powder of a multi-layer acrylic polymer containing a rubber elastic layer. Production of Acrylic Resin Sheet 20 parts of a multi-layer acrylic polymer powder containing a rubber elastic layer obtained as described above, and methyl methacrylate /
Methyl acrylate copolymer (methyl methacrylate /
Methyl acrylate = 98/2, reduced viscosity 0.06 L /
g) 80 parts and 2.0 parts of Tinuvin P (manufactured by Ciba Geigy) as an ultraviolet absorber were mixed with a Henschel mixer. Then, using a 40 mmφ screw type extruder (L / D = 26), the cylinder temperature was 200 to 26.
The mixture was melt-kneaded at 0 ° C. and a die temperature of 250 ° C., and pelletized to obtain a sheet composition. The pellet is formed into a test piece for measuring a thermal deformation temperature based on ASTM-D648 by injection molding, and after annealing at 80 ° C. for 24 hours, a low load (0.
ASTM-D6 at 45 MPa (4.6 kg / cm2)
When measured in accordance with No. 48, the heat distortion temperature is 103
° C.

The obtained pellets were dried at 80 ° C. for 24 hours, and using a 40 mmφ non-vent screw type extruder (L / D = 26) equipped with a 300 mm T die,
Cylinder temperature 200-240 ° C and T-die temperature 250
At 100 ° C., an acrylic resin sheet having a thickness of 100 μm was formed. Example 1 On one surface of the acrylic resin sheet obtained as described above,
Silicone hard coat liquid (Shin-Etsu Chemical Co., Ltd., X-
12-2206) was applied by a wire bar coating method so that the thickness of the dried coating film was 3 μm, and the solvent was evaporated until the coating film became non-tacky, and an acrylic resin having a silicone-based hard coat dried and uncured film laminated thereon I got a sheet.

Next, the inner surface of the injection molding die having a vacuuming function heated to 80 ° C. (length 100 mm × width 100 mm ×
The above-mentioned sheet was mounted on a flat portion having a thickness of 3 mm) such that the silicone-based hard coat dried and uncured film became an outer layer, and a polycarbonate resin (Mitsubishi Engineering Plastics Co., Ltd., Iupilon ML-300) was melted at 300 ° C. A resin molded product was obtained by injecting and molding into a mold and laminating and integrating a silicone-based hard coat dried uncured film laminated acrylic resin sheet.

Next, the obtained resin molded product was heated at 100 ° C. for 1 hour.
The silicone-based hard coat dried uncured film was cured by heating for 20 minutes. Table 1 shows the results of the evaluation performed on the obtained molded articles by the above-described method. Comparative Example 1 A sample was prepared and evaluated in the same manner as in Example 1, except that an acrylic resin sheet having no silicone-based hard coat film was used.

The results are shown in Table 1. Comparative Example 2 A sample was prepared and evaluated in the same manner as in Example 1, except that an acrylic resin sheet prepared without blending an ultraviolet absorber was used. Table 1 shows the results.

Example 2 and Comparative Examples 3 and 4 Samples were prepared and evaluated in the same manner as in Example 1 except that only the thickness of the silicone hard coat film was changed as shown in Table 1. Table 1 shows the results. Comparative Examples 5 and 6 Samples were prepared and evaluated in the same manner as in Example 1 except that only the post-curing conditions after molding were changed as shown in Table 1.

The results are shown in Table 1. Example 3 On one side of the acrylic resin sheet obtained as described above,
Silicone hard coat liquid (Shin-Etsu Chemical Co., Ltd., X-
12-2206) by a wire bar coating method so that the thickness of the dried coating film becomes 3 μm.
After curing for a minute, an acrylic resin sheet laminated with a hard coat film was obtained.

Next, the inner surface of the injection molding die having a vacuuming function heated to 80 ° C. (length 100 mm × width 100 mm ×
The hard coat sheet was mounted on a flat portion having a thickness of 3 mm so that the hard coat treatment layer was an outer layer, and a polycarbonate resin (Mitsubishi Engineering Plastics, Inc.)
(Iupilon ML-300) was melted at 300 ° C., injected into a mold and molded to obtain a resin molded product in which a hard coat sheet was laminated and integrated.

Table 1 shows the results of the evaluation of the obtained molded articles by the above-mentioned method. Comparative Examples 7 and 8 Samples were prepared and evaluated in the same manner as in Example 3 except that the curing conditions after application of the silicone-based hard coat liquid were changed as shown in Table 1. Table 1 shows the results.

Comparative Example 9 A polycarbonate sheet (Iupilon FE2000, manufactured by Mitsubishi Engineering-Plastics Co., Ltd., thickness: 200 μm) was used in place of the acrylic resin sheet, and KP-85 manufactured by Shin-Etsu Chemical Co., Ltd. was used as a silicone-based hard coat liquid.
In order to improve the adhesiveness between the sheet and the silicone-based hard coat film, a primer layer (PC7A, manufactured by Shin-Etsu Chemical Co., Ltd.) having a thickness of 2 μm was provided between the two to form a sheet.
A sample was prepared and evaluated in the same manner as in Example 3 except that the sample was cured for 0 minute.

Table 1 shows the results.

[0035]

[Table 1]

[0036]

The resin molded product of the present invention prevents inadvertent scratching during mounting and use, and prevents deterioration in appearance such as banding due to ultraviolet rays and the like, and prevents the front plate of audio equipment, etc. It is suitable for applications requiring scratch resistance and weather resistance such as automobile parts and windows. Further, the present invention has an advantage that a resin molded product having both surface hardness and weather resistance can be easily and economically manufactured.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08K 5/00 C08K 5/00 C08L 33/06 C08L 33/06 51/04 51/04 // B29K 101: 12 B29K 101: 12 B29L 9:00 B29L 9:00 F term (reference) 4F006 AA22 AB39 BA02 CA04 DA04 4F100 AK01D AK25A AK25C AK25J AK45 AL01A AL01C AL05A AL05C AN00A AN00C BA02 BA03 BA04 BA05C A07 BA10C BA07C EH36 EH362 EH46 EH462 EJ08 EJ082 EJ083 EJ42 GB07 GB32.

Claims (6)

[Claims] 1. A hard coat sheet in which a silicone-based hard coat film having a thickness of 2 to 7 μm is laminated on one surface of an acrylic resin sheet containing 0.05 to 10% by weight of an ultraviolet absorber. 2. An acrylic resin comprising a multilayer acrylic polymer containing a rubber elastic layer as a main component, or an acrylic resin having a multilayer elastic polymer containing a rubber elastic layer and an alkyl group having 1 to 8 carbon atoms. The hard coat sheet according to claim 1, wherein the hard coat sheet is mainly composed of a mixture with a methacrylate homopolymer or a copolymer. 3. The hard coat sheet according to claim 1, wherein the content of the ultraviolet absorbent in the acrylic resin sheet is in the range of 0.05 to 10% by weight and satisfies the following expression. [UV absorber content / sheet weight] × [sheet thickness (unit μm)] ≧ 0.4 4. A resin molded article wherein the hard coat sheet according to claim 1 is laminated and integrated with a thermoplastic resin molded article with the hard coat treated layer as an outer layer. 5. A silicone-based hard coat liquid is applied to one side of an acrylic resin sheet containing 0.05 to 10% by weight of an ultraviolet absorber so as to have a thickness of 2 to 7 μm after curing treatment, and 70 to 130 ℃ and ASTM-D6
A hard coat sheet cured at a temperature not exceeding 10 ° C. higher than the thermal deformation temperature of the acrylic resin sheet at a low load based on No. 48 is placed in a mold of an injection molding machine so that the hard coat treatment layer becomes an outer layer. A method for producing a resin molded product, comprising mounting, then injecting, molding, and laminating and integrating a thermoplastic resin in a molten state. 6. A silicone-based hard coat liquid is applied to one side of an acrylic resin sheet containing 0.05 to 10% by weight of an ultraviolet absorber so that the thickness after curing treatment is 2 to 7 μm. A dried uncured sheet that has been dried and has not been subjected to a curing treatment until the tackiness has disappeared is mounted in a mold of an injection molding machine so that a hard coat treatment layer becomes an outer layer, and then a molten thermoplastic resin is removed. The resin molded product obtained by injection, molding, lamination and integration is further subjected to a temperature within a range of 70 to 130 ° C. and a temperature not exceeding 10 ° C. higher than the thermal deformation temperature of the acrylic resin sheet under a low load based on ASTM-D648. A method for producing a resin molded product, comprising curing.