JP2007160892A - Multilayered sheet and molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multilayered sheet for thermoforming which combines a shaping property and a weather resistance and a molding using the same. <P>SOLUTION: The multilayered sheet for thermoforming comprises carrying out the coextrusion of the acrylic resin layer with the thickness of 15-100 μm containing an ultraviolet absorption agent on one surface of a polycarbonate resin layer having 20,000-24,500 of a viscosity-average molecular weight. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a polycarbonate resin laminate excellent in weather resistance and moldability and a molded body using the same. More specifically, the present invention relates to a multilayer sheet for thermoforming that is excellent in weather resistance and scratch resistance and is molded using the co-extrusion method without impairing the original properties of polycarbonate resin.

  Polycarbonate resin has excellent transparency, mechanical strength, high heat distortion temperature, and excellent dimensional stability, workability and self-extinguishing properties. in use. However, since the polycarbonate resin is inferior in weather resistance, it has a problem that the impact strength is reduced or yellowed in the case of outdoor use exposed to direct sunlight. As a method for improving these problems, a resin composition in which an ultraviolet absorber is blended with a polycarbonate resin is known, but its scratch resistance is weak and its use is restricted. Moreover, although the laminated body which coat | covered the polycarbonate resin layer with the acrylic resin layer excellent in the weather resistance is disclosed (patent document 1), there was a problem in moldability.

In addition, as a method for decorating a molded body, it is disclosed that a decorative material containing a component that can be chemically bonded is used in a decorative sheet (Patent Document 2), but odor and weather resistance due to reactive components are disclosed. Has the problem that is not sufficient.
A decorative sheet comprising a base material having a main surface as a sheet suitable for decoration of a molded product having an undulation on the surface, and a decorative layer provided on the main surface of the base material, wherein the base material is And the decorative layer includes a resin layer formed from a second resin material having a lower deflection temperature under load than the first resin material and a metal layer in contact with the resin layer. (Patent Document 3) has not been considered in consideration of weather resistance and impact resistance.

Japanese Patent Publication No. 47-018119 JP-A-10-249999 JP 2005-153351 A

  An object of the present invention is to provide a thermoforming multilayer sheet having both formability and weather resistance and a molded body using the same.

    As a result of intensive studies to solve the above problems, acrylic resin having a thickness of 15 to 100 μm containing an ultraviolet absorber on one surface of a polycarbonate resin (A) layer having a viscosity average molecular weight of 20,000 to 24,500. The thermoforming multilayer sheet (C) obtained by coextrusion of the resin (B) layer has both moldability and weather resistance, and is suitable as a thermoforming sheet. Furthermore, the viscosity average molecular weight of the polycarbonate resin layer is 27,000 to It has been found that by laminating 32,000 polycarbonate resin layers at 10 to 100 μm by coextrusion, cracking due to solvent attack of printing ink can be suppressed and workability at the time of trimming can be improved, and the present invention has been completed. .

  The multilayer sheet for thermoforming (C) of the present invention has both good formability and excellent weather resistance. Furthermore, the occurrence of cracks due to solvent attack of printing ink can be suppressed by laminating a polycarbonate resin (D) layer having a viscosity average molecular weight of 27,000 to 32,000 on the polycarbonate resin (A) layer surface by coextrusion at 10 to 100 μm. At the same time, the processability during trimming is also improved.

  The polycarbonate resin (A) constituting the polycarbonate resin (A) layer according to the present invention is not particularly limited, and can be obtained by an interfacial polymerization method of an aromatic dihydroxy compound or a small amount of a polyhydroxy compound and phosgene, or A thermoplastic polycarbonate polymer which may be branched by an ester exchange reaction between an aromatic dihydroxy compound and a carbonic acid diester. For example, a carbonic acid ester polymer containing bisphenol A as a main raw material is used. The polycarbonate resin used has a viscosity average molecular weight of 20,000 to 24,500, preferably 21,000 to 23,000. When the viscosity average molecular weight is less than 20,000, the impact resistance is decreased. When the viscosity average molecular weight exceeds 24,500, the moldability deteriorates. Various commonly used additives may be added to the polycarbonate resin. Examples of the additives include antioxidants, anti-coloring agents, flame retardants, mold release agents, antistatic agents, and dyes and pigments. It is done. The thickness of the multilayer sheet of the present invention is usually 0.3 mm to 1.2 mm, preferably 0.4 mm to 1.0 mm.

The thickness of the co-extruded acrylic resin (B) layer together with the polycarbonate resin (A) layer is 15 to 100 μm, preferably 15 to 35 μm. If it is less than 15 μm, the effect of improving weather resistance is small, and if it exceeds 100 μm, no further effect of improving weather resistance can be expected, which is economically disadvantageous.

  The acrylic resin used in the present invention is a copolymer of methyl methacrylate and an acrylic ester such as methyl acrylate, ethyl acrylate or butyl acrylate, and the copolymer composition and molecular weight may be appropriately selected depending on the co-extrusion conditions. The copolymer composition ratio is preferably 80 to 99% methyl methacrylate and 1 to 20% acrylic acid ester such as methyl, ethyl or butyl acrylate. The molecular weight is 30,000 to 300,000 in terms of weight average molecular weight, but is not limited thereto. As the load deflection temperature of the acrylic resin is higher, the glass transition temperature is higher, the roll transfer temperature is closer to the roll transfer temperature of the polycarbonate resin, and a laminate having excellent roll transfer properties and excellent appearance can be obtained. Therefore, the load deflection temperature of the acrylic resin is preferably 90 ° C. or higher, preferably 95 ° C. or higher, more preferably 100 ° C. or higher. Various kinds of commonly used additives may be added to the acrylic resin, and examples of the additive include an antioxidant, an anti-coloring agent, a flame retardant, a release agent, an antistatic agent, and a dye / pigment. Can be mentioned.

As for the molecular weight of the polycarbonate resin (D) layer laminated on the polycarbonate resin (A) layer, the viscosity average molecular weight is 27,000 to 32,000, preferably 27,000 to 28,000. Various commonly used additives may be added to the polycarbonate resin. Examples of the additives include antioxidants, anti-coloring agents, flame retardants, mold release agents, antistatic agents, and dyes and pigments. It is done. The thickness of the polycarbonate resin (D) layer laminated on the polycarbonate resin (A) layer is usually 10 μm to 100 μm, preferably 20 μm to 60 μm.

A UV absorber may be added to the polycarbonate resin (A) and (D) layers, and benzotriazole, benzophenone, salicylic acid phenyl ester, benzoxazine, malonate, and triazine UV absorbers are available. Can be mentioned.
The ultraviolet absorber added to the polycarbonate resins (A) and (D) is desirably 0.5% or less. Since the surface acrylic resin (B) layer cuts ultraviolet rays, it is generally not added.

Benzotriazole, benzophenone, salicylic acid phenyl ester, benzoxazine, malonate, triazine, and polymer type UV absorbers added as pendants as UV absorbers added to acrylic resins Is mentioned.
Examples of the benzotriazole ultraviolet absorber include 2- (5-methyl-2-hydroxyphenyl) benzotriazole, 2- [2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzo Triazole, 2- (2′-hydroxy-5′-t-octylphenyl) benzotriazole, 2,2-methylenebis [4- (1,1,3,3-tetramethylenebutyl) -6- (2H-benzotriazole -2-yl) phenol], 2- (2H-benzotriazol-2-yl) -6- (1-methyl-1-phenylethyl) -4- (1,1,3,3-tetramethylbutyl) phenol Examples of the benzophenone ultraviolet absorber include 2-hydroxy-4-octoxybenzophenone and 2,4-dihydroxybenzo Enon, 2-hydroxy-4-methoxy-4'-chloro benzophenone, 2,2-dihydroxy-4-methoxybenzophenone, can be exemplified 2,2-dihydroxy-4,4'-dimethoxy benzophenone.

Examples of salicylic acid phenyl ester ultraviolet absorbers include pt-butylphenyl salicylic acid ester.
Examples of the benzoxazine-based ultraviolet absorbing agent include 2,2 ′-(1,4-phenylene) bis [4H-3,1-benzoxazin-4-one].
Examples of the malonic ester UV absorber include dimethyl [(4-methoxyphenyl) -methylene] malonate.
Examples of triazine ultraviolet absorbers include 2,4-diphenyl-6- (2-hydroxy-4-methoxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4-). Ethoxyphenyl) -1,3,5-triazine, 2,4-diphenyl- (2-hydroxy-4-propoxyphenyl) -1,3,5-triazine, 2,4-diphenyl- (2-hydroxy-4-) Butoxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4-butoxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2- Hydroxy-4-hexyloxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4-octyloxyphenyl) -1,3,5-triazi 2,4-diphenyl-6- (2-hydroxy-4-dodecyloxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4-benzyloxyphenyl) -1 , 3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4-butoxyethoxy) -1,3,5-triazine, etc., but is not limited thereto. And generally available UV absorbers and the like.

  High molecular weight ultraviolet absorbers are those having a hydroxybenzophenone or hydroxybenzotriazole structure in the molecule, and some of them have hydrogen atoms substituted with alkyl groups. An example of a polymer type ultraviolet absorber is UVA-633L (2-hydroxy-4- (methacryloyloxyethoxy) benzophenone) methyl methacrylate copolymer, which is commercially available from BASF.

  As for the ultraviolet absorber density | concentration of the acrylic resin (B) layer which comprises the multilayer sheet for thermoforming, 0.5 to 8.0 weight% is preferable. If the ultraviolet absorber concentration of the acrylic resin (B) layer is less than 0.5% by weight, the weather resistance is insufficient, and if it exceeds 8.0% by weight, further improvement in weather resistance cannot be expected, This is not preferable because it may cause poor appearance due to contamination of the roll and coloration of the laminate during coextrusion molding.

  The specific example of a laminated body manufacturing process is described below. As an extrusion apparatus used for the production of a laminate, there are generally one main extruder for extruding a polycarbonate resin constituting a substrate layer, one sub-extruder for extruding an acrylic resin constituting a coating layer, and further an acrylic resin layer When a polycarbonate resin layer having a molecular weight higher than that of the polycarbonate resin of the core layer is laminated on the opposite surface, it is composed of another sub-extruder, and usually the sub-extruder is smaller than the main extruder. The The temperature condition of the extruder for extruding the polycarbonate resin is usually 230 to 290 ° C, preferably 240 to 280 ° C, and the temperature condition of the extruder for extruding the acrylic resin is usually 220 to 270 ° C, preferably 230 to 260 ° C. It is.

As a method for coating two or more kinds of molten resins, a known method such as a feed block method or a multi-manifold method can be used. In this case, the molten resin laminated in the feed block is guided to a sheet forming die such as a T-die and formed into a sheet shape, and then flows into a forming roll (polishing roll) whose surface is mirror-finished or molded. , Forming a bank. The sheet-like molded product is cooled while passing through the forming roll, and a laminated plate is formed. In the case of a multi-manifold die, the molten resin laminated in the die is similarly formed into a sheet inside the die, and then surface finish and cooling are performed with a forming roll to form a laminated plate. . The temperature of the die is usually 250 to 320 ° C, preferably 260 to 300 ° C, and the molding roll temperature is usually 100 to 190 ° C, preferably 110 to 180 ° C. As the roll, a vertical roll or a horizontal roll can be appropriately used.

  EXAMPLES The present invention will be described in further detail below with reference to examples, but the present invention is not limited thereto.

昇温、降温時間を１時間とし、上記サイクルを１０サイクル行った。
覆いかぶせた多層シートが成形品から２ｍｍ以上浮き上がったものを不合格とし、２ｍｍ未満を合格とした。
（２）耐候性
意匠印刷していない多層シートについてスガ試験機（株）製フェードメーターにて促進試験を行なった。測定条件は、ブラックパネル温度８３℃で行った。試験は、アクリル樹脂（Ｂ）層側に光が当たる様に行う。
曝露前後の黄色度（Ｙ．Ｉ．値）の差（ΔＹ．Ｉ．）を透過測定法で求めた。
５００時間曝露後のΔＹ．Ｉが２以下を合格とした。 The evaluation and measurement methods used in this example are shown below.
(1) Formability: A dome-shaped molded product having a perspective radius from the top of 100 mm and a height of 50 mm and a concave mold having a clearance of 1 mm from the molded product are prepared.
A 3M spray paste 111 is applied to the surface of the molded product.
Next, it is heated at 180 ° C. for 5 minutes so that the acrylic resin layer is in contact with the ferro plate on the ferro plate coated with the release agent laid in the hot air circulating dryer. The softened multilayer sheet is placed on the molded article coated with adhesive spray so that the polycarbonate surface is in contact with it and pressed with a concave mold. After the sheet is cooled and solidified, the concave mold is removed to obtain an integrally molded body.
After the following wet heat cycle test, the molded body is checked for peeling from the dome-shaped molded product due to the spring back of the shaped sheet.

The temperature rise / fall time was 1 hour, and the above cycle was repeated 10 times.
The covered multilayer sheet floated 2 mm or more from the molded product was rejected, and less than 2 mm was accepted.
(2) An acceleration test was conducted on a multilayer sheet that was not printed with a weather resistant design using a fade meter manufactured by Suga Test Instruments Co., Ltd. The measurement conditions were a black panel temperature of 83 ° C. The test is performed so that light strikes the acrylic resin (B) layer side.
The difference (ΔY.I.) in yellowness (Y.I. value) before and after exposure was determined by transmission measurement.
ΔY after exposure for 500 hours. I was 2 or less.

Example 1
A single-screw extruder with a barrel diameter of 65 mm and a screw L / D = 35 was used as the polycarbonate resin (A) layer extruder, the cylinder temperature was 270 ° C., and the discharge rate was 40 kg / hr. Moreover, the extruder for acrylic resin (B) layers containing the ultraviolet absorber used as a coating layer uses a single screw extruder with a barrel diameter of 32 mm and a screw L / D = 32, and is set at a cylinder temperature of 240 ° C. Then, extrusion was carried out at a discharge rate of 2500 g / hr. Two types of two-layer type feed block set temperature at the time of melt extrusion of two types of resins and lamination were 260 ° C., and the die set temperature was 280 ° C. The layers (A) and (B) layered and integrated in the feed block exit the die and are guided to three mirror-finished polishing rolls. The first roll temperature is 120 ° C and the second roll temperature is 140 ° C. The third roll temperature was set to 180 ° C. After forming the bank at the first roll interval, the second and third rolls were passed. The take-up speed was 2.0 m / min, and the take-up pinch roll speed was 2.4 m / min. The thickness of the obtained laminate (C) was 0.5 mm, and the thickness of the layer (B) calculated from the discharge amount was 30 μm. This multilayer sheet was used to process into an integrally molded body. The evaluation results are shown in Table 1.
In addition, the polycarbonate resin used in Example 1 is Mitsubishi Gas Chemical Co., Ltd., Iupilon S-3000 (trade name), and a viscosity average molecular weight of 21,500. The acrylic resin is Kuraray Co., Ltd. product, Parapet HR-1000L (trade name). Tinuvin 1577 (trade name) manufactured by Ciba Specialty Chemicals as a UV absorber [compound name: 2,4-diphenyl-6- (2-hydroxyphenyl-4-hexyloxyphenyl) 1,3,5-triazine] Of 3.0% by weight.

Example 2
A single-screw extruder with a barrel diameter of 65 mm and a screw L / D = 35 was used as the polycarbonate resin (A) layer extruder, the cylinder temperature was 270 ° C., and the discharge rate was 40 kg / hr. Moreover, the extruder for acrylic resin (B) layers containing the ultraviolet absorber used as a coating layer uses a single screw extruder with a barrel diameter of 32 mm and a screw L / D = 32, and is set at a cylinder temperature of 240 ° C. Then, extrusion was carried out at a discharge rate of 2500 g / hr. Two types of two-layer type feed block set temperature at the time of melt extrusion of two types of resins and lamination were 260 ° C., and the die set temperature was 280 ° C. The layers (A) and (B) layered and integrated in the feed block exit the die and are guided to three mirror-finished polishing rolls. The first roll temperature is 120 ° C and the second roll temperature is 140 ° C. The third roll temperature was set to 180 ° C. After forming the bank at the first roll interval, the second and third rolls were passed. The take-up speed was 2.0 m / min, and the take-up pinch roll speed was 2.4 m / min. The thickness of the obtained laminate (C) was 0.5 mm, and the thickness of the layer (B) calculated from the discharge amount was 30 μm. This multilayer sheet was used to process into an integrally molded body. The evaluation results are shown in Table 1.
In addition, the polycarbonate resin used in Example 1 is Mitsubishi Gas Chemical Co., Ltd., Iupilon S-1000 (trade name), and a viscosity average molecular weight of 24,500. The acrylic resin is Kuraray Co., Ltd. product, Parapet HR-1000L (trade name). Tinuvin 1577 (trade name) manufactured by Ciba Specialty Chemicals as a UV absorber [compound name: 2,4-diphenyl-6- (2-hydroxyphenyl-4-hexyloxyphenyl) 1,3,5-triazine] Of 3.0% by weight.

Example 3
A single-screw extruder having a barrel diameter of 65 mm and a screw L / D = 35 was used as the extruder for the polycarbonate resin (A) layer, the cylinder temperature was 270 ° C., and the discharge amount was 36 kg / hr. Moreover, the extruder for acrylic resin (B) layers containing the ultraviolet absorber used as a coating layer uses a single screw extruder with a barrel diameter of 32 mm and a screw L / D = 32, and is set at a cylinder temperature of 240 ° C. Then, extrusion was carried out at a discharge rate of 2500 g / hr. Furthermore, the extruder for the polycarbonate resin (D) layer laminated on the opposite surface of the acrylic resin layer uses a single-screw extruder with a barrel diameter of 32 mm and a screw L / D = 32, set the cylinder temperature to 270 ° C., and discharges. Extrusion was carried out at an amount of 4200 g / hr. The three types of three-layer type feed block set temperature at the time of melt extrusion of three types of resins and lamination were 260 ° C., and the die set temperature was 280 ° C. The layers (A), (B), and (D) laminated and integrated in the feed block exit the die and are guided to three mirror-finished polishing rolls. The temperature was set to 140 ° C., and the third roll temperature was set to 180 ° C. After forming the bank at the first roll interval, the second and third rolls were passed. The take-up speed was 2.0 m / min, and the take-up pinch roll speed was 2.4 m / min. The thickness of the obtained laminate (C) was 0.5 mm, the thickness of the (B) layer calculated from the discharge amount was 30 μm, and the thickness of the (D) layer was 50 μm. This multilayer sheet was used to process into an integrally molded body. The evaluation results are shown in Table 1.
In addition, the polycarbonate resin (A) used in Example 1 is Mitsubishi Gas Chemical Co., Ltd., Iupilon S-1000 (trade name), and a viscosity average molecular weight of 24,500. Moreover, polycarbonate resin (D) is Mitsubishi Gas Chemical Co., Ltd. product, Iupilon E-2000 (brand name), and a viscosity average molecular weight 27,500. The acrylic resin is Kuraray Co., Ltd. product, Parapet HR-1000L (trade name). Tinuvin 1577 (trade name) manufactured by Ciba Specialty Chemicals as a UV absorber [compound name: 2,4-diphenyl-6- (2-hydroxyphenyl-4-hexyloxyphenyl) 1,3,5-triazine] Of 3.0% by weight.

Comparative Example 1
A single-screw extruder with a barrel diameter of 65 mm and a screw L / D = 35 was used as the polycarbonate resin (A) layer extruder, the cylinder temperature was 270 ° C., and the discharge rate was 40 kg / hr. Moreover, the extruder for acrylic resin (B) layers containing the ultraviolet absorber used as a coating layer uses a single screw extruder with a barrel diameter of 32 mm and a screw L / D = 32, and is set at a cylinder temperature of 240 ° C. Then, extrusion was carried out at a discharge rate of 2500 g / hr. Two types of two-layer type feed block set temperature at the time of melt extrusion of two types of resins and lamination were 260 ° C., and the die set temperature was 280 ° C. The layers (A) and (B) layered and integrated in the feed block exit the die and are guided to three mirror-finished polishing rolls. The first roll temperature is 120 ° C and the second roll temperature is 140 ° C. The third roll temperature was set to 180 ° C. After forming the bank at the first roll interval, the second and third rolls were passed. The take-up speed was 2.0 m / min, and the take-up pinch roll speed was 2.4 m / min. The thickness of the obtained laminate (C) was 0.5 mm, and the thickness of the layer (B) calculated from the discharge amount was 30 μm. This multilayer sheet was used to process into an integrally molded body. The evaluation results are shown in Table 2.
In addition, the polycarbonate resin used by the comparative example 1 is Mitsubishi Gas Chemical Co., Ltd. product, Iupilon E-2000 (brand name), and the viscosity average molecular weight 27,500. The acrylic resin is Kuraray Co., Ltd. product, Parapet HR-1000L (trade name). Tinuvin 1577 (trade name) manufactured by Ciba Specialty Chemicals as a UV absorber [compound name: 2,4-diphenyl-6- (2-hydroxyphenyl-4-hexyloxyphenyl) 1,3,5-triazine] Of 3.0% by weight.

Comparative Example 2
A single-screw extruder with a barrel diameter of 65 mm and a screw L / D = 35 was used as the polycarbonate resin (A) layer extruder, the cylinder temperature was 270 ° C., and the discharge rate was 40 kg / hr. Moreover, the extruder for acrylic resin (B) layers containing the ultraviolet absorber used as a coating layer uses a single screw extruder with a barrel diameter of 32 mm and a screw L / D = 32, and is set at a cylinder temperature of 240 ° C. Then, extrusion was carried out at a discharge rate of 800 g / hr. Two types of two-layer type feed block set temperature at the time of melt extrusion of two types of resins and lamination were 260 ° C., and the die set temperature was 280 ° C. The layers (A) and (B) layered and integrated in the feed block exit the die and are guided to three mirror-finished polishing rolls. The first roll temperature is 120 ° C and the second roll temperature is 140 ° C. The third roll temperature was set to 180 ° C. After forming the bank at the first roll interval, the second and third rolls were passed. The take-up speed was 2.0 m / min, and the take-up pinch roll speed was 2.4 m / min. The thickness of the obtained laminate (C) was 0.5 mm, and the thickness of the layer (B) calculated from the discharge amount was 10 μm. This multilayer sheet was used to process into an integrally molded body. The evaluation results are shown in Table 2.
In addition, the polycarbonate resin used by the comparative example 2 is Mitsubishi Gas Chemical Co., Ltd. product, Iupilon S-1000 (brand name), and a viscosity average molecular weight 24,500. The acrylic resin is Kuraray Co., Ltd. product, Parapet HR-1000L (trade name). Tinuvin 1577 (trade name) manufactured by Ciba Specialty Chemicals as a UV absorber [compound name: 2,4-diphenyl-6- (2-hydroxyphenyl-4-hexyloxyphenyl) 1,3,5-triazine] Of 3.0% by weight.

Comparative Example 3
A single-screw extruder having a barrel diameter of 65 mm and a screw L / D = 35 was used as the polycarbonate resin (A) layer extruder, the cylinder temperature was set to 270 ° C., and the extrusion rate was 22.5 kg / hr. Moreover, the extruder for acrylic resin (B) layers containing the ultraviolet absorber used as a coating layer uses a single screw extruder with a barrel diameter of 32 mm and a screw L / D = 32, and is set at a cylinder temperature of 240 ° C. Then, extrusion was carried out at a discharge rate of 2000 g / hr. Furthermore, the extruder for the polycarbonate resin (D) layer laminated on the opposite surface of the acrylic resin layer uses a single-screw extruder with a barrel diameter of 32 mm and a screw L / D = 32, set the cylinder temperature to 270 ° C., and discharges. Extrusion was performed at an amount of 8000 g / hr. The three types of three-layer type feed block set temperature at the time of melt extrusion of three types of resins and lamination were 260 ° C., and the die set temperature was 280 ° C. The layers (A), (B), and (D) laminated and integrated in the feed block exit the die and are guided to three mirror-finished polishing rolls. The temperature was set to 140 ° C., and the third roll temperature was set to 180 ° C. After forming the bank at the first roll interval, the second and third rolls were passed. The take-up speed was 1.5 m / min, and the take-up pinch roll speed was 1.8 m / min. The thickness of the obtained laminate (C) was 0.5 mm, the thickness of the (B) layer calculated from the discharge amount was 30 μm, and the thickness of the (D) layer was 120 μm. This multilayer sheet was used to process into an integrally molded body. The evaluation results are shown in Table 1.
In addition, the polycarbonate resin (A) used by the comparative example 3 is Mitsubishi Gas Chemical Co., Ltd. product, Iupilon S-1000 (brand name), and a viscosity average molecular weight 24,500. Moreover, polycarbonate resin (D) is Mitsubishi Gas Chemical Co., Ltd. product, Iupilon E-2000 (brand name), and a viscosity average molecular weight 27,500. The acrylic resin is Kuraray Co., Ltd. product, Parapet HR-1000L (trade name). Tinuvin 1577 (trade name) manufactured by Ciba Specialty Chemicals as a UV absorber [compound name: 2,4-diphenyl-6- (2-hydroxyphenyl-4-hexyloxyphenyl) 1,3,5-triazine] Of 3.0% by weight.

Claims (5)

  A multilayer for thermoforming in which a 15-100 μm thick acrylic resin (B) layer containing a UV absorber is coextruded on one surface of a polycarbonate resin (A) layer having a viscosity average molecular weight of 20,000-24,500 Sheet (C).   The multilayer sheet (C) for thermoforming according to claim 1, wherein the acrylic resin (B) layer contains 0.5 to 8% by weight of an ultraviolet absorber.   The multilayer sheet for thermoforming (C) according to claim 1, wherein the acrylic resin (B) layer has a thickness of 15 to 35 µm.   The multilayer sheet for thermoforming (C) according to claim 1, wherein a polycarbonate resin (D) layer having a viscosity average molecular weight of 27,000 to 32,000 is laminated on the polycarbonate resin (A) layer surface by coextrusion at 10 to 100 µm. After the design printing is performed on the polycarbonate resin (A) layer surface of the multilayer sheet for thermoforming (C), it is heated, and the surface of the pre-molded molded body is covered so that the acrylic resin (B) layer is on the outside. Integrated molded body.