JP4777621B2 - Polycarbonate resin composition and molded article using the same - Google Patents

Description

  The present invention relates to a polycarbonate resin composition containing a glass filler and excellent in transparency and strength, and a molded article using the same.

  The polycarbonate resin molded article is transparent and excellent in mechanical strength such as heat resistance and impact resistance, and is widely used as an industrial transparent material in the electrical, mechanical and automotive fields. Moreover, it is used also for a lens, an optical disc, etc. as a plastic for optical materials.

  However, although the polycarbonate resin molded product is excellent in mechanical strength, it is lower than glass and ceramics. Therefore, when mechanical strength is required, a glass filler or the like is added for reinforcement.

  As such a glass filler, a glass fiber conventionally called E glass is mainly used, but the refractive index of the polycarbonate resin (refractive index in sodium D line: nD) is 1.580 to 1.590. On the other hand, since the refractive index of E glass is about 1.555, the polycarbonate resin molded product reinforced with E glass has a problem that transparency is lowered due to the difference in refractive index between the two.

  On the other hand, by changing the composition of the glass filler, the refractive index of the glass filler is brought close to the refractive index of the polycarbonate resin or substantially the same refractive index, thereby maintaining the transparency of the polycarbonate resin molded product. To be considered.

For example, in the following Patent Document 1, in terms of mass%, SiO ₂ is 50 to 65%, Al ₂ O ₃ is 0 to 6%, MgO is 0 to 5%, CaO is 3 to 10%, and BaO is 2 to 2. 10%, ZnO 0-7%, SrO 0-5%, Na ₂ O 3-8%, K ₂ O 3-8%, LiO 0-5%, ZrO ₂ 3-10%, A composition for reinforced glass fibers of polycarbonate resin, comprising TiO ₂ of 5.3 to 10%, is disclosed.

Further, in Patent Document 2 below, in terms of mass%, SiO ₂ : 54.0 to 62.0%, Al ₂ O ₃ : 8.0 to 12.0%, MgO: 0 to 5.0%, CaO : 18.0~22.0%, BaO: 0~5.0% , ZnO: 0~5.0%, Na 2 O + K 2 O + Li 2 O: 0~1.0%, ZrO 2: 0.6~ A glass composition comprising 5.0%, TiO ₂ : 0.5 to 1.9%, having a refractive index of 1.5700 to 1.6000 and used for reinforcing a polycarbonate resin is disclosed.

  In addition, it has been studied to improve a polycarbonate resin by using commercially available glass fibers. For example, in Patent Document 3 below, an aromatic using a reaction product of hydroxyaralkyl alcohol and lactone as a terminal terminator is disclosed. A resin composition containing a polycarbonate resin and a glass filler having a refractive index difference of 0.01 or less between the aromatic polycarbonate resin is disclosed.

Patent Document 4 below discloses a resin composition comprising an aromatic polycarbonate resin, a glass fiber having a refractive index difference of 0.015 or less between the aromatic polycarbonate resin, and polycaprolactone. Yes.
JP 58-60641 A JP-A-5-155638 JP-A-7-118514 JP-A-9-165506

  The polycarbonate resin molded article using the glass composition of Patent Documents 1 and 2 can be excellent in transparency and mechanical properties, but the glass fiber of Patent Documents 1 and 2 has a relatively specific gravity. Since it is large, the polycarbonate resin molded product using the glass composition has a relatively heavy mass.

  Moreover, in the aromatic polycarbonate resin composition of patent document 3, the raw material of aromatic polycarbonate resin is expensive, and the molded article obtained becomes expensive.

  Further, since the aromatic polycarbonate resin composition of Patent Document 4 contains polycaprolactone, there is a problem that the heat resistance and mechanical properties of the molded product are likely to be lowered.

  Therefore, the object of the present invention is suitable for, for example, parts for electrical equipment, precision equipment, automobiles, construction, agriculture, furniture parts, etc. that require transparency, mechanical strength, and weight reduction. It is in providing the polycarbonate resin composition which can be used for, and a polycarbonate resin molded article.

In order to achieve the above object, according to one aspect of the present invention, there is provided a polycarbonate resin composition containing a polycarbonate resin and a glass filler, wherein the glass filler comprises 50 to 60% by mass of silicon dioxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ) 10 to 15% by mass, calcium oxide (CaO) 15 to 25% by mass, titanium oxide (TiO ₂ ) 2 to 10% by mass, boron oxide (B ₂ O ₃ ) 2 to 8% by mass, magnesium oxide ( MgO) 0-5 mass%, zinc oxide (ZnO) 0-5 mass%, barium oxide (BaO) 0-5 mass%, zirconium oxide (ZrO ₂ ) 0-5 mass%, lithium oxide (Li ₂ O) 0 to 2% by weight, sodium oxide _(Na 2 O) 0-2 wt%, potassium oxide _(K 2 O) contained 0-2 wt%, and the lithium oxide (Li Sum of O) and the sodium oxide _(Na 2 O) and the potassium oxide _(K 2 O) is consist of the composition is 0-2% by mass, the refractive index of the glass filler is from 1.583 to 1. 586, the difference in refractive index between the glass filler and the polycarbonate resin is 0.001 or less, and the content of the glass filler is 2% by mass or more and less than 10% by mass.

  The refractive index of the glass filler having the above composition is substantially the same as the refractive index of the polycarbonate resin. By adding the glass filler to the polycarbonate resin in an amount of 2% by mass or more and less than 10% by mass, a polycarbonate resin molded product is obtained. A molded product having excellent mechanical strength can be obtained while maintaining the transparency.

  Moreover, it is preferable that the said glass filler is 1 type selected from glass fiber, glass powder, glass flakes, milled fiber, and glass beads.

  The polycarbonate resin molded product of the present invention is characterized in that the polycarbonate resin composition is molded to a thickness of 0.3 to 20 mm. If the thickness of the molded product is within the above range, it can be a resin molded product that is excellent in transparency and mechanical properties and hardly warps.

  Moreover, it is preferable that the polycarbonate resin molded product of the present invention has at least one layer of film selected from a hard coat film, an antifogging film, an antistatic film, and an antireflection film.

  Furthermore, the polycarbonate resin molded article of the present invention preferably has a total light transmittance of 85% or more for visible light and a haze of 10% or less.

  The polycarbonate resin molded product of the present invention preferably has a 60-degree specular gloss of 130 or more according to the plastic optical property test method of JIS-K7105.

  And it is preferable to use the polycarbonate resin molded product of this invention for the components of the components for electrical equipment, precision equipment, automobiles, construction, agriculture, and furniture.

  In the present invention, since a polycarbonate resin molded article excellent in transparency and mechanical strength can be obtained, for example, parts for electrical equipment, precision equipment, automobiles, architecture, agriculture, furniture parts, etc. It can be suitably used as a molded product that requires transparency, mechanical strength, and weight reduction.

  The polycarbonate resin composition of the present invention contains a glass filler and a polycarbonate resin.

One of the glass fillers used in the present invention is 50 to 60% by mass of silicon dioxide (SiO ₂ ), 10 to 15% by mass of aluminum oxide (Al ₂ O ₃ ), 15 to 25% by mass of calcium oxide (CaO), and titanium oxide. (TiO ₂ ) 2 to 10% by mass, boron oxide (B ₂ O ₃ ) 2 to 8% by mass, magnesium oxide (MgO) 0 to 5% by mass, zinc oxide (ZnO) 0 to 5% by mass, barium oxide (BaO) ) 0-5% by weight, zirconium oxide _(ZrO 2) 0-5 mass% of lithium oxide _(Li 2 O) 0 to 2 wt%, sodium oxide _(Na 2 O) 0 to 2 wt%, potassium oxide _{(K 2} O) 0 to 2% by mass, and the total of the lithium oxide (Li ₂ O), the sodium oxide (Na ₂ O), and the potassium oxide (K ₂ O) is 0 to 2% by mass. From composition To have.

Another glass filler used in the present invention is 50 to 60% by mass of silicon dioxide (SiO ₂ ), 10 to 15% by mass of aluminum oxide (Al ₂ O ₃ ), and 15 to 25% by mass of calcium oxide (CaO). , Titanium oxide (TiO ₂ ) 2-5% by mass, magnesium oxide (MgO) 0-5% by mass, zinc oxide (ZnO) 0-5% by mass, barium oxide (BaO) 0-5% by mass, zirconium oxide (ZrO) ₂₎ 2 to 5% by weight, containing lithium oxide _(Li 2 O) 0-2 wt% of sodium oxide _(Na 2 O) 0-2 wt%, 0-2 wt% of potassium oxide _(K 2 O), Boron oxide (B ₂ O ₃ ) is not substantially contained, and the total of the lithium oxide (Li ₂ O), the sodium oxide (Na ₂ O), and the potassium oxide (K ₂ O) is 0 to 0. 2% by mass It is made from a composition that.

In the composition of the above glass filler, silicon dioxide (SiO ₂ ) needs to be 50 to 60% by mass. If the SiO ₂ content is less than 50% by mass, the strength of the glass filler decreases, and if it exceeds 60% by mass, the solubility decreases, which is not preferable.

Aluminum oxide (Al ₂ O ₃ ) needs to be 10 to 15% by mass. When Al ₂ O ₃ is less than 10% by mass, chemical durability such as water resistance is lowered, and when it exceeds 15% by mass, the solubility is lowered and the glass tends to be inhomogeneous, which is not preferable. .

The content of boron oxide (B ₂ O ₃ ) is 2 to 8% by mass or does not substantially contain. That is, the glass composition of the present invention can be applied to a case where 2 to 8% of B ₂ O ₃ is contained as standard, such as E glass. In this case, if the content of B ₂ O ₃ exceeds 8%, the strength as the glass filler is lowered, which is not preferable. Also applicable to a case that does not substantially contain B ₂ O ₃ as ECR glass composition, which is excellent in acid resistance and alkali resistance. In the present invention, “substantially not containing B ₂ O _3” means that the content of B ₂ O ₃ is 0.1% by mass or less.

  Calcium oxide (CaO) needs to be 15 to 25% by mass. If the CaO content is less than 15% by mass, the solubility as glass decreases, and if it exceeds 25% by mass, crystallization tends to occur and the transparency decreases, which is not preferable.

  Magnesium oxide (MgO) is an optional component and can be contained in an amount of 0 to 5% by mass. By containing MgO, a part of Ca in the above CaO can be replaced with Mg, and durability such as tensile strength can be improved. When the content of MgO exceeds 5% by mass, the solubility as glass is lowered, which is not preferable.

When 2 to 8% by mass of boron oxide (B ₂ O ₃ ) is contained, the content of titanium oxide (TiO ₂ ) needs to be 2 to 10% by mass. By setting the content in this range, the refractive index can be sufficiently improved even if the alkali component described later is 1% or less. When TiO ₂ is less than 2% by mass, the refractive index is not sufficiently improved. When it exceeds 10% by mass, the glass tends to be devitrified, and the strength of the glass filler is reduced. It is not preferable because it is colored yellow. The content of TiO ₂ is preferably 8% by mass or less, more preferably 6% by mass or less, because it suppresses the yellowness of the glass filler.

When B ₂ O ₃ is not substantially contained, TiO ₂ needs to be ₂ to 5%. This is because B ₂ O ₃ is a component that lowers the refractive index, and the content of TiO ₂ , which is a component that raises the refractive index, can be reduced. If TiO ₂ is less than 2%, it is insufficient to increase the refractive index. On the other hand, if it exceeds 5% by mass, the refractive index is excessively increased, and the difference from the refractive index of the polycarbonate resin becomes large.

Zinc oxide (ZnO), barium oxide (BaO), and zirconium oxide (ZrO ₂ ) are also optional components and can be contained in amounts of 0 to 5% by mass, respectively.

  By containing ZnO and BaO, the refractive index can be increased and devitrification can be suppressed. If the respective contents exceed 5% by mass, the liquidus temperature rises and it becomes easy to devitrify.

ZrO ₂ can also be contained in an amount of 0 to 5% by mass. When B ₂ O ₃ is not substantially contained, it is preferably contained in an amount of 2 to 5% by mass. By containing ZrO ₂ , the refractive index can be increased and the chemical durability can be improved. When the content exceeds 5% by mass, the solubility as glass is lowered and the glass is easily devitrified, which is not preferable.

_{Incidentally,} if it contains B 2 _{O 3} 2 to 8% by weight, preferably the sum of ZnO and BaO and ZrO ₂ described above, a 0-5 wt% based on the entire glass filler, 2-5 More preferably, it is mass%. _Further, when not containing B 2 _{O 3} substantially is the sum of ZnO and BaO and ZrO ₂ described above, is preferably 2 to 5 wt% based on the entire glass filler. Since these components contain heavy elements such as Zn, Ba, and Zr, if the total exceeds 5% by mass, the specific gravity of the glass increases and the weight of the molded product increases, which is not preferable.

Lithium oxide (Li ₂ O), sodium oxide (Na ₂ O), and potassium oxide (K ₂ O), which are alkali components, can each be contained in an amount of 0 to 2% by mass, and the total of these can be based on the entire glass filler It is the characteristic of this invention that it is 0-2 mass% or less.

  When the total content of the alkali components exceeds 2% by mass, the water resistance of the glass is lowered, and the alkali is easily eluted. And the molecular weight of polycarbonate resin falls by the eluted alkaline component, and becomes a factor of the physical-property fall of a molded article.

Thus, even if the content of the alkali component is low, when 2 to 8% by mass of B ₂ O ₃ is contained as described above, ₂ to 10% by mass of TiO ₂ is contained, and B ₂ O ₃ In the present invention, the refractive index can be sufficiently improved by containing ₂ to 5% by mass of TiO ₂ . And since there are few alkali components, the molecular weight fall by decomposition | disassembly of polycarbonate resin can be prevented, and physical properties fall, such as the intensity | strength of a molded article, can be prevented.

  The refractive index of the glass filler having the above composition is 1.580 to 1.590, preferably 1.582 to 1.590, more preferably 1.583 to 1.586, and 1.584 to 1.586. It is particularly preferred that Thereby, a glass filler having a refractive index in the same range as that of a normal polycarbonate resin can be obtained.

  In the present invention, the difference between the refractive index of the polycarbonate resin and the refractive index of the glass filler needs to be 0.001 or less. If the difference between the refractive index of the polycarbonate resin and the refractive index of the glass filler exceeds 0.001, it is not preferable because the transparency of the molded product becomes insufficient.

  In addition to the above glass components, the glass filler of the present invention may contain the following components within a range that does not adversely affect spinnability, water resistance and the like. For example, as a component for increasing the refractive index of glass, lanthanum (La), Y (yttrium), gadolinium (Gd), bismuth (Bi), antimony (Sb), tantalum (Ta), niobium (Nb) or tungsten (W) An oxide containing an element such as may be included. Moreover, you may include the oxide containing elements, such as cobalt (Co), copper (Cu), or neodymium (Nd), as a component which discolors yellow of glass.

In addition, since the glass raw material necessary for obtaining the glass filler of the present invention suppresses coloring, the content of Fe ₂ O _{3 on the} basis of oxide as an impurity in the raw material is 0.01% with respect to the whole glass. It is preferable that it is less than mass%.

  In the present invention, the glass filler can be used as glass fiber, glass powder, glass flake, milled fiber, or glass bead.

  The glass fiber can be obtained by using a conventionally known method for spinning long glass fibers. For example, the glass raw material is continuously vitrified in a melting furnace and guided to the forehearth, and a direct melt (DM) method in which a bushing is attached to the bottom of the forehearth for spinning, or the molten glass is processed into marble, cullet, or rod shape. The glass can be made into fiber using various methods such as a remelting method in which it is remelted and spun.

  The average diameter of the glass fiber is not particularly limited, but a glass fiber having a diameter of 3 to 25 μm is preferably used. If it is thinner than 3 μm, the contact area between the glass fiber and the resin increases, causing irregular reflection, and the transparency of the molded product may decrease. When it is thicker than 25 μm, the strength of the glass fiber becomes weak, and as a result, the strength of the molded product may be lowered.

  Glass powder is obtained by a conventionally known production method. For example, a glass raw material is melted in a melting furnace, the melt is poured into water and crushed, or formed into a sheet shape with a cooling roll, and the sheet is pulverized. Can be. Although the particle size of glass powder is not specifically limited, A thing of 1-100 micrometers is used preferably.

  Glass flakes are obtained by a conventionally known production method. For example, a glass raw material is melted in a melting furnace, the melt is drawn into a tube shape, the glass film thickness is made constant, and then crushed with a roll to obtain a frit having a specific film thickness. It can be ground into flakes having the desired aspect ratio. The thickness and aspect ratio of the glass flake are not particularly limited, but those having a thickness of 0.1 to 10 μm and an aspect ratio of 5 to 150 are preferably used.

  The milled fiber can be obtained using a conventionally known milled fiber manufacturing method. For example, a glass fiber strand can be made into a milled fiber by pulverizing with a hammer mill or a ball mill. The fiber diameter and aspect ratio of the milled fiber are not particularly limited, but those having a fiber diameter of 3 to 25 μm and an aspect ratio of 2 to 150 are preferably used.

  Glass beads are obtained by a conventionally known production method. For example, a glass raw material can be melted in a melting furnace, and the melt can be sprayed with a burner to form glass beads having a desired particle size. The particle size of the glass beads is not particularly limited, but those having 5 to 300 μm are preferably used.

  Then, in order to increase the affinity between the polycarbonate resin and the glass filler, increase the adhesion, and suppress the decrease in transparency of the molded product due to void formation, the glass filler is surface-treated with a treatment agent containing a coupling agent. It is preferable.

  As the coupling agent, a silane coupling agent, a borane coupling agent, an aluminate coupling agent, a titanate coupling agent, or the like can be used. In particular, it is preferable to use a silane coupling agent from the viewpoint of good adhesion between the polycarbonate resin and glass. As the silane coupling agent, an aminosilane coupling agent, an epoxysilane coupling agent, an acrylic silane coupling agent, or the like can be used. Of these silane coupling agents, aminosilane coupling agents are most preferably used.

  Examples of components other than the coupling agent contained in the treatment agent include a film former, a lubricant, and an antistatic agent. These may be used alone or in combination with a plurality of components. As the film former, polymers such as vinyl acetate resin, urethane resin, acrylic resin, polyester resin, polyether resin, phenoxy resin, polyamide resin, epoxy resin or polyolefin resin, or modified products thereof can be used. As the lubricant, aliphatic ester-based, aliphatic ether-based, aromatic ester-based or aromatic ether-based surfactants can be used. As the antistatic agent, an inorganic salt such as lithium chloride or potassium iodide, or a quaternary ammonium salt such as an ammonium chloride type or an ammonium ethosulphate type can be used.

  The polycarbonate resin used by this invention is not specifically limited, For example, what is obtained by making bisphenol A and phosgene react is used. The viscosity average molecular weight is preferably 12000 to 35000.

  In this invention, the said glass filler contained in a polycarbonate resin composition is 2 mass% or more and less than 10 mass%, It is preferable that it is 5-8 mass%. If the content is less than 2% by mass, the effect of improving the mechanical properties cannot be sufficiently obtained. If the content exceeds 10% by mass, the contact area between the resin and the glass increases, and the transparency of the molded product decreases. Since it falls, it is not preferable. By setting the amount of the glass filler contained in the polycarbonate resin composition within the above range, a molded product having both high transparency and good mechanical properties can be obtained, and this molded product has high transparency. Can be used in required applications.

  Furthermore, a well-known additive can be used for the polycarbonate resin composition of this invention in the range which does not impair characteristics, such as refractive index. For example, the antioxidant can suppress the decomposition of the resin during the production or molding of the glass fiber reinforced polycarbonate resin composition.

  And the polycarbonate resin composition of this invention can be manufactured using a conventionally well-known method. For example, the method of mixing the said polycarbonate resin, the said glass filler, and arbitrary additives using a mixer etc., melt-kneading with an extruder, and pelletizing can be used preferably.

  The method for producing a polycarbonate resin molded product of the present invention can be obtained by molding a polycarbonate resin composition by a conventionally known molding method, for example, injection molding, extrusion molding, compression molding, calendar molding, or the like. Moreover, you may shape | mold using the metal mold | die with which the inside was covered with the resin film or the resin sheet.

  In that case, it is necessary to adjust the thickness of the molded product to 0.3 to 20 mm, and preferably 0.5 mm to 5 mm. If the thickness of the molded product is less than 0.3 mm, warpage is likely to occur and the mechanical strength is weak. Moreover, when larger than 20 mm, transparency will be impaired.

  The molded article is preferably provided with a hard coat film, an antifogging film, an antistatic film, or an antireflection film, and may be a composite film of two or more types.

  Among them, it is particularly preferable that a hard coat film is formed since weather resistance is good and wear of the surface of the molded article over time can be prevented. The material of the hard coat film is not particularly limited, and known materials such as an acrylate hard coat agent, a silicone hard coat agent, and an inorganic hard coat agent can be used.

  The production conditions of the polycarbonate resin composition and the molding conditions of the polycarbonate resin molded product can be appropriately selected and are not particularly limited, but the heating temperature during melt-kneading and the resin temperature during injection molding are the decomposition of the resin. Therefore, it is usually preferable to select appropriately from the range of 220 ° C to 300 ° C.

  When at least a part of the glass filler is present on the outermost surface of the molded product, the surface roughness of the molded product increases, and irregular reflection on the surface of the molded product increases, resulting in deterioration of the transparency of the molded product. is there. For this reason, as a method of reducing the surface roughness of the molded product, there is a method of reducing the surface roughness of the molded product by forming a layer (skin layer) having a high resin content ratio on the outermost surface of the molded product. is there. As a method for forming this skin layer, in the case of injection molding, the temperature of the mold is set to a temperature higher than general conditions, so that the resin in contact with the mold can easily flow, and the outermost surface of the molded product The surface roughness can be reduced. In the case of press molding, the surface roughness of the outermost surface of the molded product can be reduced by setting the pressure during molding to a pressure higher than the general conditions. By reducing the surface roughness of the molded product using the above-described method, irregular reflection on the surface of the molded product is reduced, haze is reduced, and as a result, the transparency of the molded product can be improved.

  In the present invention, 60 ° specular gloss is used as an index of the surface roughness of a molded product, among the measuring methods specified in the plastic optical property test method of JIS-K7105. The 60 degree specular gloss of the molded article of the present invention is preferably 130 or more. If it is less than 130, irregular reflection on the outermost surface of the molded product increases, and the transparency of the molded product tends to decrease.

  In the present invention, the total light transmittance with respect to visible light of the polycarbonate resin molded article is preferably 85% or more, and the haze is preferably 10% or less, more preferably the total light transmittance is 88% or more. 5% or less. Since the polycarbonate resin molded article having the optical properties is excellent in transparency, it can be used in applications requiring high transparency.

  In addition, the total light transmittance with respect to visible light can be measured according to JIS-K7361, and haze can be measured according to JIS-K7105.

  The polycarbonate resin molded product of the present invention can be applied to a portion that needs to identify the inside of the applied molded product, for example, an outer plate, a housing, an opening member, and the like. For example, 1) Various parts such as televisions, radio cassettes, video cameras, video tape recorders, audio players, DVD players, telephones, displays, computers, registers, copiers, printers, facsimiles, etc., electrical devices such as outer plates and housings Parts 2) Parts for precision equipment such as cases and covers for precision machines such as mobile phones, PDAs, cameras, slide projectors, watches, calculators, measuring instruments, and display devices 3) Sunroofs, door visors, rear windows Automobile parts such as side windows, 4) Architectural parts such as architectural glass, soundproof walls, carports, sunrooms and gratings, 5) Agricultural parts such as greenhouses, greenhouses, etc. 6) Lighting covers and blinds And furniture parts such as interior appliances.

  Hereinafter, the present invention will be described in more detail with reference to examples.

[Manufacture of glass fiber]
Glass fibers of Production Examples 1 to 4 were produced with the composition (% by mass) shown in Table 1.

  The glass fiber was spun at a fiber diameter of 15 μm by a conventionally known method, and aminosilane + urethane was adhered as a binder to 0.5 mass%. Table 1 shows the refractive index (nD) and specific gravity of the glass fiber. Here, the refractive index of the glass fiber is a value obtained by measuring the test piece by the immersion method according to the method B of JIS-K7142, and the specific gravity is a value measured by the Archimedes method.

[Manufacture of glass fiber reinforced polycarbonate resin molded products]
The glass fibers of Examples 1 to 4 and Comparative Examples 1 to 3 were compounded using the glass fibers of Production Examples 1 to 4 under the following conditions, and the mold temperature was injection molded as described in Table 2. A fiber-reinforced polycarbonate resin molded product was produced.

Compound condition polycarbonate resin: Lexan 121R (manufactured by GE Plastics, molecular weight 21000, nD = 1.585)
Glass fiber: 15 μm diameter, 3 mm long chopped strand, 400 bundles Glass content: 5% by mass
Extruder: TEM-35B (Toshiba Machine Co., Ltd.)
Extrusion temperature: 280 ° C
Injection condition molding machine: IS-80G (Toshiba Machine Co., Ltd.)
Cylinder temperature: 300 ° C
Mold temperature: 95 ° C or 120 ° C

  Table 2 summarizes the optical properties and mechanical properties of the polycarbonate resin molded product. Here, the total light transmittance, which is an optical property of the molded product, is a value obtained by measuring a sample having a thickness of 2 mm according to JIS-K7361 using an NDH sensor manufactured by Nippon Denshoku Co., Ltd. It is a value obtained by measuring a sample having a thickness of 2 mm according to JIS-K7105 method a using an NDH sensor manufactured by Color Co., Ltd., and the 60-degree specular gloss is a gloss meter (No. 565-YSD- This is a value obtained by measuring a sample having a thickness of 2 mm according to JIS-K7105. Moreover, the bending strength and bending elasticity which are mechanical physical properties are values measured using a sample having a thickness of 3 mm in accordance with ASTM D-790, respectively.

  From Table 2, the molded products of the examples have the same mechanical properties as the comparative examples, and the haze is lower than that of the comparative examples and is excellent in transparency. Further, by increasing the mold temperature, the glossiness is increased and the surface roughness of the molded product can be suppressed.

  The molded article of the present invention can be suitably used for a member that requires transparency and strength.

The polycarbonate resin composition obtained by the present invention, and a polycarbonate resin molded product using the same are molded products that require both physical properties of transparency and strength, for example, for electrical equipment, precision equipment, automobiles, It can be suitably used for architectural, agricultural, and furniture parts.

Claims (7)

In the polycarbonate resin composition containing a polycarbonate resin and a glass filler, the glass filler is 50 to 60% by mass of silicon dioxide (SiO ₂ ), 10 to 15% by mass of aluminum oxide (Al ₂ O ₃ ), calcium oxide (CaO ) 15-25% by mass, titanium oxide (TiO ₂ ) 2-10% by mass, boron oxide (B ₂ O ₃ ) 2-8% by mass, magnesium oxide (MgO) 0-5% by mass, zinc oxide (ZnO) 0 5% by weight, barium oxide (BaO) 0 to 5 wt%, zirconium oxide _(ZrO 2) 0 to 5 wt%, lithium oxide _(Li 2 O) _0~2 wt% of sodium oxide _(Na 2 O) _0~ 2 wt%, potassium oxide _(K 2 O) contained 0-2% by weight and the sodium oxide and the lithium oxide _{(Li 2 O) (Na 2} O) The sum of the potassium oxide _(K 2 O) is consist of the composition is 0-2% by mass, the refractive index of the glass filler is from 1.583 to 1.586, and the glass filler and polycarbonate resin A polycarbonate resin composition, wherein a difference in refractive index is 0.001 or less, and a content of the glass filler is 2% by mass or more and less than 10% by mass. The polycarbonate resin composition according to claim 1 , wherein the glass filler is one selected from glass fiber, glass powder, glass flake, milled fiber, and glass beads. A polycarbonate resin molded product, wherein the polycarbonate resin composition according to claim 1 or 2 is molded to a thickness of 0.3 to 20 mm. The polycarbonate resin molded article according to claim 3 , wherein at least one layer of a film selected from a hard coat film, an antifogging film, an antistatic film and an antireflection film is formed. The polycarbonate resin molded article according to claim 3 or 4 , wherein the total light transmittance for visible light is 85% or more and the haze is 10% or less. The polycarbonate resin molded article according to any one of claims 3 to 5 , wherein the 60-degree specular gloss of the polycarbonate resin molded article according to the plastic optical property test method of JIS-K7105 is 130 or more. The polycarbonate resin molded product according to any one of claims 3 to 6 , which is used for one kind selected from parts for electrical equipment, precision equipment, automobiles, architecture, agriculture, and furniture.