JP2008280483A - Amorphous polyamide resin composition and molded product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an amorphous polyamide resin composition having sufficient transparency and excellent in rigidity, mechanical properties and heat resistance and to provide a molded product of the amorphous polyamide resin. <P>SOLUTION: There is used a glass filler which contains 68-72% silicon oxide (SiO<SB>2</SB>), 2-5% aluminum oxide (Al<SB>2</SB>O<SB>3</SB>), 2-5% boron oxide (B<SB>2</SB>O<SB>3</SB>), 2-10% calcium oxide (CaO), 0-5% zinc oxide (ZnO), 0-5% strontium oxide (SrO), 0-1% barium oxide (BaO), 1-5% magnesium oxide (MgO), 0-5% lithium oxide (Li<SB>2</SB>O), 5-12% sodium oxide (Na<SB>2</SB>O) and 0-10% potassium oxide (K<SB>2</SB>O) on oxides basis in terms of mass% and in which the total amount of the lithium oxide, sodium oxide and potassium oxide is 8-12%. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an amorphous polyamide resin composition and a molded article excellent in transparency, heat resistance and rigidity.

  Conventionally, a transparent resin has been used as a material for a molded article that requires normal transparency, such as an automobile part, a lighting device, and an electrical part. Recently, an optical material in which optical properties are important. Application is progressing. Among these, amorphous polyamide resins due to the polymerization monomer structure are used as transparent resins for optical materials and the like because of their low birefringence and high transparency.

  However, non-crystalline polyamide resin has insufficient rigidity. For this reason, attempts have been made to improve the rigidity of amorphous polyamide resin molded articles by adding fiber reinforcing materials such as glass fibers, inorganic fillers, rubber components, and the like.

  For example, the following Patent Document 1 discloses an amorphous polyamide resin composition obtained by blending a glass filler such as glass fiber with an amorphous polyamide resin composition containing a transparent polyamide resin and a styrene-butadiene copolymer. Is disclosed.

Patent Document 2 listed below includes 100 parts by weight of a mixture of 60 to 90% by weight of an aliphatic crystalline polyamide resin, 0 to 20% by weight of a semi-aromatic amorphous polyamide resin, and 5 to 30% by weight of a phenol resin. A polyamide resin composition comprising 50 to 200 parts by weight of glass fiber is disclosed.
JP-A-4-337355 Japanese Unexamined Patent Publication No. 7-53862

  Conventionally, a glass filler called E glass or S glass has been mainly used as a reinforcing material for general polyamide resin.

  However, the refractive index (nD) at a wavelength of 589 nm of the amorphous polyamide resin is 1.50 to 1.54, whereas the refractive index of E glass is about 1.555. For this reason, due to the difference in refractive index between the two, the amorphous polyamide resin molded product reinforced with E glass has a problem that the transparency is impaired although the strength is improved. Similarly, the refractive index of S glass is about 1.521. If there is no difference in refractive index between the two, the transparency of the amorphous polyamide resin molded product reinforced with S glass is not impaired, but S glass has a very high melting temperature of about 1800 degrees C. There was a problem that it was difficult to manufacture.

  Also in the above-mentioned Patent Document 1, since the amorphous polyamide resin is reinforced with the glass fiber having the E glass composition, the obtained amorphous polyamide resin molded product has a total light transmittance of 56 to 71%. The transparency was not enough.

  Moreover, in the said patent document 2, the glass fiber is mix | blended in the amorphous polyamide resin for the purpose of improving rigidity and mechanical strength, and it does not consider transparency and changes the composition of the glass fiber. No attempt is made to match the refractive indexes of the amorphous polyamide resin and the glass fiber.

  Accordingly, an object of the present invention is to provide an amorphous polyamide resin composition and a molded article having sufficient transparency and excellent heat resistance and rigidity.

  As a result of intensive studies by the present inventors in achieving the above object, a glass filler having a specific glass composition not specifically disclosed in the conventional technical data and a specific amorphous polyamide resin are blended. Thus, it has been found that an amorphous polyamide resin composition having sufficient transparency and excellent rigidity and heat resistance can be obtained. The present invention has arrived at the present invention based on such novel findings, and is characterized by the following.

The amorphous polyamide resin composition of the present invention is a non-crystalline polyamide resin composition containing a resin component containing an amorphous polyamide resin and a glass filler.
The glass filler is expressed in terms of mass% based on oxide, and is 68 to 74% silicon oxide (SiO ₂ ), 2 to 5% aluminum oxide (Al ₂ O ₃ ), and 2 to 5% boron oxide (B ₂ O ₃ ). , Calcium oxide (CaO) 2 to 10%, zinc oxide (ZnO) 0 to 5%, strontium oxide (SrO) 0 to 5%, barium oxide (BaO) 0 to 1%, magnesium oxide (MgO) 1 to 5% Lithium oxide (Li ₂ O) 0 to 5%, sodium oxide (Na ₂ O) 5 to 12%, potassium oxide (K ₂ O) 0 to 10%, and lithium oxide (Li ₂ O) The total amount of sodium oxide (Na ₂ O) and potassium oxide (K ₂ O) is 8 to 12%.

  By adding a glass filler having the above composition to a resin component containing an amorphous polyamide resin, a resin composition having sufficient transparency can be obtained, and equivalent to the case of using conventional E glass fibers. An amorphous polyamide resin composition having mechanical strength and heat resistance can be provided. Moreover, since the glass filler consisting of the above composition has a glass melting temperature equivalent to the melting temperature of the E glass composition, glass fibers can be easily produced even in the case of long glass fibers that are difficult to form glass. it can.

  In the amorphous polyamide resin composition of the present invention, the difference in refractive index between the glass filler and the resin component is 0.002 or less with respect to light with a wavelength of 589 nm, and is 0.00 with respect to light with a wavelength of 486 nm. 002 or less, 0.002 or less with respect to light having a wavelength of 656 nm, parallel light transmittance when the composition is formed into a 2 mm-thick flat plate shape, and a haze of less than 25%. Preferably there is.

In the amorphous polyamide resin composition of the present invention, as the glass filler, the total content of silicon oxide (SiO ₂ ) and aluminum oxide (Al ₂ O ₃ ) is 70- It is preferable to use one having a composition of 79%.

  Moreover, it is preferable to use the glass filler having a composition in which the total content of calcium oxide (CaO) and magnesium oxide (MgO) is 2 to 15% in terms of mass% on the oxide basis.

Further, as the glass filler, it is preferable to use those having a composition containing substantially no titanium oxide (TiO _2).

  Moreover, it is preferable that the content rate of the said glass filler in an amorphous polyamide resin composition is 5-40 mass%.

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

  On the other hand, the amorphous polyamide resin molded product of the present invention is obtained by molding the amorphous polyamide resin composition.

  According to the amorphous polyamide resin molded product of the present invention, the difference between the refractive index of the amorphous polyamide resin and the refractive index of the glass filler is very close even after reinforcement with the glass filler. A highly molded product can be obtained.

  In the present invention, an amorphous polyamide resin molded article excellent in transparency, mechanical strength, and heat resistance can be obtained, so that a molded article that requires both physical properties of transparency and strength, for example, electrical equipment and electronic equipment. It can be suitably used as a molded product requiring both physical properties of transparency and strength, such as a cover for the display unit and a substitute for plate glass used in automobiles and building materials. Moreover, it can be used suitably also for the use as which the molded article of the said field | area requires further heat resistance.

[Amorphous polyamide resin composition]
The amorphous polyamide resin composition of the present invention contains a resin component containing an amorphous polyamide resin and a glass filler.

  The amorphous polyamide resin composition of the present invention is such that the difference between the refractive index of the resin component containing the amorphous polyamide resin and the refractive index of the glass filler is 0.002 or less with respect to light having a wavelength of 589 nm. Yes, it is 0.002 or less for light with a wavelength of 486 nm, preferably 0.002 or less for light with a wavelength of 656 nm, and 0.001 or less for light with the above three wavelengths, respectively. Is more preferable. When the difference in refractive index between the resin component containing the amorphous polyamide resin and the glass filler is greater than 0.002 with respect to light of the above three wavelengths, the amorphous polyamide resin composition is molded. The resulting molded article is not preferable because of insufficient transparency.

  Next, each component of the amorphous polyamide resin composition of the present invention will be described.

(Resin component)
The resin component containing an amorphous polyamide resin used in the amorphous polyamide resin composition of the present invention is not particularly limited as long as it contains an amorphous polyamide resin having transparency. By using a raw material monomer having an asymmetric chemical structure among the raw materials constituting the polyamide resin, an amorphous polyamide resin having transparency can be obtained. The resin component containing an amorphous polyamide resin may be an amorphous polyamide resin alone, and includes a polyamide resin, a polyolefin resin, a polystyrene resin, a thermoplastic elastomer, a rubber component, etc. as long as the transparency is not impaired. It may be a polymer alloy of an amorphous polyamide resin.

  Examples of the amorphous polyamide resin include polyamide PA12 / MACMI (PA12 / 3,3-dimethyl-4,4-diaminocyclohexylmethane, isophthalic acid), PA12 / MACMT (PA12 / 3,3-dimethyl). -4,4-diaminocyclohexyl methane, terephthalic acid), PA MACM 12 (3,3-dimethyl-4,4-diaminocyclohexyl methane, decanedicarboxylic acid or laurolactam), PA MC 12 (PA 12, 1,3-bis (Aminomethyl) cyclohexane), PA6I / 6T, PA6I / 6T / MACMI and the like. In addition, the description of the said polyamide resin followed JISK6920-1.

  In the present invention, a commercially available resin component containing an amorphous polyamide resin may be used. For example, trade name “Grillamide TR55” (AMS-Chemie) including PA12 / MACMI, PA MACM The product name “Grillamide TR90” (AM-Chemie) including PA 12, the product name “Trogamide CX” (Degussa) including PA MC 12, and the product name “Crystamide MS” (Arkema) including PA12 / MACMT are included. Can be mentioned.

  The refractive index of the resin component containing the amorphous polyamide resin is 1.505 to 1.545 for light of wavelength 589 nm, 1.512 to 1.555 for light of wavelength 486 nm, and light of wavelength 656 nm. It is preferably 1.502 to 1.541. Among them, in order to reduce the refractive index difference with the glass filler, 1.508 to 1.520 for light with a wavelength of 589 nm, 1.515 to 1.527 for light with a wavelength of 486 nm, and 656 nm for light with a wavelength of 656 nm. It is particularly preferably 1.505 to 1.517. As a resin component having such a refractive index, for example, trade name “Grillamide TR90” (AMS-Chemie, Refractive index for light of wavelength 589 nm = 1.509, Refractive index for light of wavelength 486 nm = 1.516) , Refractive index with respect to light having a wavelength of 656 nm = 1.506).

(Glass filler)
The glass filler used in the amorphous polyamide resin composition of the present invention is based on an oxide based on mass%, and silicon oxide (SiO ₂ ) 68 to 74%, aluminum oxide (Al ₂ O ₃ ) 2 to 5%, oxidized Boron (B ₂ O ₃ ) 2-5%, calcium oxide (CaO) 2-10%, zinc oxide (ZnO) 0-5%, strontium oxide (SrO) 0-5%, barium oxide (BaO) 0-1 %, Magnesium oxide (MgO) 1-5%, lithium oxide (Li ₂ O) 0-5%, sodium oxide (Na ₂ O) 5-12%, potassium oxide (K ₂ O) 0-10% In addition, the total amount of lithium oxide (Li ₂ O), sodium oxide (Na ₂ O), and potassium oxide (K ₂ O) is 8 to 12%.

  Hereinafter, the composition of the glass filler of the present invention will be described by simply describing mass% as%.

In the composition of the above glass filler, the content of silicon oxide (SiO ₂ ) needs to be 68 to 74%, and preferably 68 to 72%. When the content of silicon oxide (SiO ₂ ) is less than 68%, it becomes difficult to adjust the refractive index of the glass filler to the refractive index of the amorphous polyamide resin, and the content of silicon oxide (SiO ₂ ) is too small. If it exceeds 74%, the solubility during the production of the glass filler is lowered, which is not preferable. In particular, when a glass filler is used as the glass fiber, the spinning temperature rises, making it difficult to produce.

The content of aluminum oxide (Al ₂ O ₃ ) needs to be 2 to 5%, and preferably 2 to 4%. When the content of aluminum oxide (Al ₂ O ₃ ) is less than 2%, chemical durability such as water resistance decreases, and when the content of aluminum oxide (Al ₂ O ₃ ) exceeds 5% Since the solubility at the time of glass filler manufacture falls and glass becomes easy to become heterogeneous, it is not preferable.

The total amount of silicon oxide (SiO ₂ ) and aluminum oxide (Al ₂ O ₃ ) is preferably 70 to 79%, more preferably 71 to 76%. According to this, it is easy to approximate the refractive index of the glass filler to the refractive index of the amorphous polyamide resin.

Sodium oxide (Na ₂ O) needs to be contained in an amount of 5 to 12%, and preferably 8 to 11%. If the content exceeds 12%, the water resistance of the glass tends to decrease, and if it is less than 5%, it becomes difficult to match the refractive index of the glass filler to the refractive index of the amorphous polyamide resin.

Lithium oxide (Li ₂ O) can be contained in an amount of 0 to 5%, preferably 0 to 2%. Further, potassium oxide (K ₂ O) can be contained in an amount of 0 to 10%, preferably 0 to 5%. Replacing a part of sodium oxide (Na ₂ O) with lithium oxide (Li ₂ O) or potassium oxide (K ₂ O) can improve the water resistance of the glass.

Then, it contains 8% to 12% lithium oxide of the alkali components _(Li 2 O) and sodium oxide _(Na 2 O) and potassium oxide _(K 2 O) in total, and more preferably contains from 8 to 11% .

  If the total amount of the alkali components exceeds 12%, the water resistance of the glass tends to decrease, and if it is less than 8%, the meltability during the production of the glass filler decreases, making it difficult for the glass to melt, Since it becomes difficult to obtain a glass filler, it is not preferable.

  The content of calcium oxide (CaO) needs to be 2 to 10%, and preferably 6 to 9%. If the content of calcium oxide (CaO) is less than 2%, the melting property as glass tends to decrease, and if the content of calcium oxide (CaO) exceeds 10%, the refractive index of the glass filler is decreased. This is not preferable because it becomes difficult to approach the refractive index of the amorphous polyamide resin.

  Zinc oxide (ZnO) is an optional component and can be contained in an amount of 0 to 5%, preferably 0 to 2%. By containing zinc oxide (ZnO), the water resistance of the glass can be improved, but if it exceeds the upper limit, the glass tends to devitrify, which is not preferable.

  Strontium oxide (SrO) is an optional component and can be contained in an amount of 0 to 5%, preferably 0 to 2%.

  Barium oxide (BaO) is an optional component and is preferably contained in an amount of 0 to 1%.

  The total amount of calcium oxide (CaO), zinc oxide (ZnO), strontium oxide (SrO), and barium oxide (BaO) is preferably 4 to 10%, more preferably 6 to 10%. If the total amount of the above components is less than 4%, the solubility as glass may be lowered, and if it exceeds 10%, the refractive index of the glass filler may be adjusted to the refractive index of the amorphous polyamide resin. It becomes difficult.

  The content of magnesium oxide (MgO) needs to be 1 to 5%, preferably 1 to 3%. By including magnesium oxide (MgO), mechanical properties as glass can be improved. If the content of magnesium oxide (MgO) exceeds 5%, the solubility as glass is lowered, which is not preferable.

The content of boron oxide (B ₂ O ₃ ) needs to be 2 to 5%, and preferably 2 to 4%. When the content of boron oxide (B ₂ O ₃ ) is less than 2%, it is difficult to match the refractive index of the glass filler with the refractive index of the amorphous polyamide resin, which is not preferable. If the content of boron oxide (B ₂ O ₃ ) exceeds 5%, it tends to volatilize when the glass is melted, and corrosion of manufacturing equipment due to the volatile components increases, or equipment for recovering the volatile components is required. This is not preferable.

In the glass composition range of the glass filler of the present invention, when titanium oxide (TiO ₂ ) is contained, the glass filler is colored brown and the resulting molded product becomes yellow. It becomes difficult to fit. Therefore, it is preferable that titanium oxide (TiO ₂ ) is not substantially contained. “Substantially not contained” means, for example, that it is not intentionally contained unless it is mixed as an impurity from an industrial raw material, and indicates a content of less than 0.1% as TiO ₂ .

  As a glass component of the glass filler of the present invention, there is no problem even if components other than those described above are present within a range not impairing the effects of the present invention. For example, a metal oxide such as Fe, Co, Ni, Sn, Zr, or Mo may be contained as a component of the glass composition.

  The glass filler having the above composition has a refractive index of 1.505 to 1.545 for light of wavelength 589 nm, a refractive index of 1.512 to 1.555 for light of wavelength 486 nm, and a refractive index of light of wavelength 656 nm. 1.502 to 1.541, which is substantially the same as the refractive index of the amorphous polyamide resin. For this reason, an amorphous polyamide resin molded article having sufficient transparency and excellent mechanical strength can be obtained. Moreover, since the melting temperature of glass is 1500-1600 degreeC, it can fiberize similarly to the case of E glass composition.

The composition of the glass filler is, for example, silicon oxide (SiO ₂ ) 68 to 72%, aluminum oxide (Al ₂ O ₃ ) 2 to 4%, boron oxide (B ₂ O ₃ ) 2 to 4%, calcium oxide ( CaO) 6-9%, zinc oxide (ZnO) 0-2%, strontium oxide (SrO) 0-2%, barium oxide (BaO) 0-1%, magnesium oxide (MgO) 1-3%, lithium oxide ( By making Li ₂ O) 0 to 2%, sodium oxide (Na ₂ O) 8 to 11%, and potassium oxide (K ₂ O) 0 to 5%, the refractive index with respect to light having a wavelength of 589 nm is 1.508 to 1 It is easy to obtain a glass filler having a refractive index of 1.515 to 1.527 for light having a wavelength of 520 nm and a refractive index of 1.505 to 1.517 for light having a wavelength of 656 nm.

As described above, silicon oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), and an alkali component are components that can lower the refractive index of the glass filler, and the refractive index of the glass other than the above is used. Examples of components that can be lowered include P ₂ O ₅ and F ₂ .

Therefore, when the refractive index of the glass filler is smaller than the desired refractive index, that is, the refractive index of the amorphous polyamide resin, for example, a portion of the silicon oxide (SiO ₂ ) content is replaced with calcium oxide (CaO). By substituting for, the refractive index can be increased. Specifically, for example, when 0.4% of silicon oxide (SiO ₂ ) is replaced with 0.4% of calcium oxide (CaO), the refractive index of the glass filler increases by about 0.002.

Further, when the refractive index of the glass filler is larger than the desired refractive index, that is, the refractive index of the amorphous polyamide resin, for example, a part of the calcium oxide (CaO) content is replaced with an alkali component. The refractive index can be lowered. Specifically, for example, when 0.5% of calcium oxide (CaO) is replaced with 0.8% of sodium oxide (Na ₂ O), the refractive index of the glass filler decreases by about 0.002.

  Thus, by adjusting the component that can increase the refractive index of the glass filler and the component that can decrease the refractive index of the glass filler, by appropriately replacing each within the scope of the present invention, The refractive index of a glass filler can be adjusted suitably and the glass filler which has the refractive index of the same range as the refractive index of an amorphous polyamide resin can be obtained.

  In the present invention, the glass filler can be used as glass fiber, glass powder, glass flake, milled fiber, or glass bead. Among them, glass fiber has a spinning effect and mechanical strength equivalent to those of reinforcing fibers such as conventional E glass fiber, and has a high reinforcing effect on amorphous polyamide resin molded products. It is preferable to use it.

  The glass fiber can be obtained 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 the direct melting (DM) method in which a bushing is attached to the bottom of the forehearth for spinning, or the molten glass is processed into a marble, cullet, or rod shape. The glass can be made into fiber by using various methods such as a remelting method of remelting and spinning.

  The diameter of the glass fiber is not particularly limited, but a glass fiber having a diameter of 5 to 50 μm is preferably used. If it is thinner than 5 μm, the contact area between the glass fiber and the resin increases, causing irregular reflection, and the transparency of the molded product may be lowered. When the thickness is larger than 50 μm, the strength of the glass fiber becomes weak, and as a result, the strength of the molded product may be lowered. More preferably, it is 10-45 micrometers.

  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 5 to 50 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.

  Furthermore, as a glass filler of this invention, you may use combining 2 or more types chosen from glass fiber, glass powder, glass flakes, milled fiber, and a glass bead.

  In order to increase the affinity between the resin component containing the amorphous polyamide 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 used as a coupling agent. You may surface-treat with the processing agent containing this.

  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 amorphous polyamide resin and the glass filler. 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, vinyl acetate resin, urethane resin, acrylic resin, polyester resin, polyether resin, phenoxy resin, polyamide resin, epoxy resin and the like 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.

  In this invention, it is preferable that content of the said glass filler of an amorphous polyamide resin composition is 5-40 mass%, More preferably, it is 5-20 mass%. When the content of the glass filler is less than 5% by mass, the mechanical properties of a molded product obtained by molding the obtained amorphous polyamide resin composition tend to be insufficient, and when it exceeds 40% by mass, the resin There is a tendency that the contact area between the glass filler and the glass filler is increased, the transparency of a molded product obtained by molding the amorphous polyamide resin composition obtained is lowered, and the moldability is lowered. By setting the amount of the glass filler contained in the amorphous polyamide resin composition within the above range, a molded product having both high mechanical properties and good transparency can be obtained. It can be used in applications where physical properties are required.

(Other ingredients)
Further, the amorphous polyamide resin composition of the present invention may further contain a coupling agent. As a coupling agent, the same silane coupling agent, borane coupling agent, aluminate coupling agent, or titanate coupling agent as the coupling agent contained in the processing agent of the above-mentioned glass filler should be used. A silane coupling agent is preferable from the viewpoint that the adhesion between the amorphous polyamide resin and the glass filler is improved.

  Further, the amorphous polyamide resin composition of the present invention may contain other known additives as long as the properties such as transparency are not impaired. For example, the antioxidant can suppress the decomposition and coloring of the resin during the production or molding of the amorphous polyamide resin composition. Moreover, a colored transparent molded product can be obtained by using a colorant.

[Method for producing amorphous polyamide resin composition]
The amorphous polyamide resin composition of the present invention can be produced using a conventionally known method. For example, a melt kneading method or a pultrusion method is preferably used.

  The melt kneading method is a method in which a molten resin, a glass filler, and an arbitrary additive are kneaded with an extruder. In the melt-kneading method, a resin is melted with a twin screw extruder and a glass filler is introduced through a feed port in the middle (side feed method), and a resin and glass filler pre-prescribed with a twin screw or single screw extruder. And a method (premix method) of melt-kneading any additive. In the side feed method, an optional additive may be premixed with a resin or premixed with a glass filler in accordance with its properties. Furthermore, in order to suppress decomposition and discoloration due to air oxidation, a method in which the extruder opening and the material input port are placed in a nitrogen atmosphere may be used.

  The pultrusion method is preferably used when the shape of the glass filler is long glass fiber and the molded product to be obtained requires higher mechanical strength. The pultrusion method involves impregnating a resin as a matrix into a fiber bundle while drawing a continuous long glass fiber bundle, and impregnating the resin through the fiber bundle in an impregnation bath containing a matrix resin solution. Method: Spraying the matrix resin powder onto the fiber bundle, or passing the fiber bundle through a tank containing the powder, adhering the matrix resin powder to the fiber bundle, melting the matrix resin, and impregnating the fiber bundle Examples thereof include a method in which a matrix resin is supplied to the crosshead from an extruder or the like while passing the fiber bundle through the crosshead, and the fiber bundle is impregnated. A method using a crosshead is preferred.

[Amorphous polyamide resin molded product]
The amorphous polyamide resin molded article of the present invention is obtained by molding the amorphous polyamide resin composition of the present invention by a conventionally known molding method, for example, injection molding, extrusion molding, compression molding, calendar molding, or the like. It is done. Moreover, you may shape | mold using the metal mold | die covered by the resin film or the resin sheet at the time of shaping | molding.

  In this case, the thickness of the molded product may be any thickness, but particularly in the case of a molded product requiring transparency, it is necessary to adjust to 0.1 to 5 mm, more preferably 0.2 to 2 mm. If the thickness of the molded product is less than 0.1 mm, warpage is likely to occur, mechanical strength is weak, and molding is difficult. If it is larger than 5 mm, the transparency is 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 for the amorphous polyamide resin composition and the molding conditions for the amorphous polyamide resin molded product can be selected as appropriate, and are not particularly limited, but the heating temperature during melt-kneading and the resin conditions during injection molding are not particularly limited. The temperature is preferably suitably selected from the range of 220 ° C. to 300 ° C. in order to suppress the decomposition of the resin.

  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 (equal to or higher than the deflection temperature under load of the material), so that the resin in contact with the mold can be obtained. It is easy to flow and the surface roughness of the outermost surface of the molded product can be reduced. In addition, the inner surface of the mold is coated with a resin so that the molten resin is not cooled rapidly by being injected into the mold, and a sheet that has been molded in advance to follow the mold (film insert molding) is introduced. There are methods such as placing a film on a mold surface and molding (in-mold and press molding). 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.

  When the amorphous polyamide resin molded product of the present invention obtained in this way is molded into a flat plate, it is necessary that the parallel light transmittance for visible light is 65% or more and the haze is less than 25%. is there. The parallel light transmittance is preferably 70% or more. The haze is preferably 15% or less. Since the amorphous polyamide resin molded product having the optical properties is excellent in transparency, it can be used in applications requiring high transparency. In addition, the parallel light transmittance with respect to visible light can be measured according to JIS-K7105, and haze can be measured according to JIS-K7136.

  And the amorphous polyamide resin molded product of this invention can be utilized suitably for the site | part where mechanical property and heat resistance are requested | required with transparency. For example, 1) Optical materials such as optical lenses, optical mirrors, prisms, light diffusion plates, and materials for electronic / electrical parts, 2) Liquid chemical containers for injection, vials, ampoules, prefilled syringes, infusion bags, pharmaceutical containers, Examples include medical tool parts such as medical sample containers. In the field where an amorphous polyamide resin molded product is already used, the molded product can be suitably used for a component or the like that requires the tap strength or screw tightening strength of the molded product. Furthermore, it can be suitably used for a portion that needs to identify the inside of the molded product, for example, an outer plate, a housing, an opening member, and the like. Specifically, 3) parts for precision equipment such as cases and covers of precision machines such as mobile phones, PDAs, cameras, slide projectors, watches, calculators, measuring instruments, and display devices, 4) televisions, radio cassettes, Various parts for video cameras, video tape recorders, audio players, DVD players, telephones, displays, computers, registers, copiers, printers, facsimiles, parts for electrical equipment such as outer parts and housing parts, 5) sunroofs , Automotive parts such as door visors, rear windows, side windows, 6) architectural glass, sound barriers, carports, solariums and gratings, etc. 7) lighting covers, blinds, interior fixtures, etc. Furniture parts, 8) and the like can be mentioned and can be suitably used for these.

  Hereinafter, the present invention will be specifically described with reference to examples. However, these examples are illustrative of embodiments of the present invention and are not intended to limit the scope of the present invention.

[Manufacture of glass fiber]
Glass fibers of Production Examples 1 to 3 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%. Composition of the glass fiber, refractive index with respect to light with a wavelength of 589 nm (hereinafter referred to as nD), refractive index with respect to light with a wavelength of 486 nm (hereinafter referred to as nF), and refractive index with respect to light with a wavelength of 656 nm (hereinafter referred to as nC). Are also shown in Table 1. Here, the refractive index of the glass fiber is a value measured by an immersion method according to the B method of JIS-K7142.

[Manufacture of glass fiber reinforced amorphous polyamide resin molded products]
The glass fiber of Production Example 1 was used as a glass filler and compounded under the following conditions to produce the glass fiber-reinforced amorphous polyamide resin molded product of Examples 1 and 2. Moreover, the glass fiber reinforced amorphous polyamide resin molded article of Comparative Examples 1 and 2 was manufactured in the same manner as in Examples 1 and 2, using the glass fiber of Production Example 3 (E glass composition) as the glass filler.

<Amorphous polyamide resin used>
Amorphous polyamide resin: Grillamide TR90 (Ms Chemie, nD = 1.509, nF = 1.516, nC = 1.506)
<Compound conditions>
・ Glass fiber: 15 μm diameter, 3 mm long chopped strand, 400 bundles ・ Extruder: TEM-35B (manufactured by Toshiba Machine Co., Ltd.)
Extrusion temperature: 280 ° C
・ Glass content: 10% by mass, 20% by mass
<Injection conditions>
・ Molding machine: IS-80G (Toshiba Machine Co., Ltd.)
・ Cylinder temperature: 280 ℃
-Mold temperature: 130 ° C

  Table 2 summarizes the optical properties and mechanical properties of the amorphous polyamide resin molded product. Here, the parallel light transmittance, which is an optical property, is a value obtained by measuring a sample having a thickness of 2 mm according to JIS-K7105 using an NDH sensor manufactured by Nippon Denshoku Co., Ltd., and the haze value is Nippon Denshoku Co., Ltd. It is the value which measured the sample of thickness 2mm according to JIS-K7136 using the NDH sensor made from. For mechanical properties, a sample with a thickness of 3 mm was used, bending strength and bending elasticity were measured according to ASTM D-790, tensile strength was measured according to ASTM D-638, and deflection of load, which is an index of heat resistance strength. The temperature (hereinafter referred to as DTUL) was measured according to ASTM-D648.

At this time, the difference in refractive index between the glass fiber of Production Example 1 and the amorphous polyamide resin in Examples 1 and 2 was 0.002 for light with a wavelength of 589 nm, light with a wavelength of 486 nm, and light with a wavelength of 656 nm, respectively. It was the following.
On the other hand, the refractive index difference between the glass fiber of Production Example 3 and the amorphous polyamide resin in Comparative Examples 1 and 2 was 0.047 with respect to light having a wavelength of 589 nm, a wavelength of 486 nm, and a wavelength of 656 nm, respectively.

  From the results of Table 2 above, when Examples 1 and 2 are compared with Comparative Examples 1 and 2, the molded product of the example has the same mechanical properties as the molded product of the comparative example, and the haze is in the comparative example. Compared to the comparative example, the parallel light transmittance was low and the transparency was improved.

The amorphous polyamide resin composition of the present invention and the amorphous polyamide resin molded product using the same can be suitably used for molded products that require both physical properties of transparency and strength.

Claims (8)

In an amorphous polyamide resin composition containing a resin component containing an amorphous polyamide resin and a glass filler,
The glass filler is expressed in terms of mass% based on oxide, and is 68 to 74% silicon oxide (SiO ₂ ), 2 to 5% aluminum oxide (Al ₂ O ₃ ), and 2 to 5% boron oxide (B ₂ O ₃ ). , Calcium oxide (CaO) 2 to 10%, zinc oxide (ZnO) 0 to 5%, strontium oxide (SrO) 0 to 5%, barium oxide (BaO) 0 to 1%, magnesium oxide (MgO) 1 to 5% Lithium oxide (Li ₂ O) 0 to 5%, sodium oxide (Na ₂ O) 5 to 12%, potassium oxide (K ₂ O) 0 to 10%, and lithium oxide (Li ₂ O) An amorphous polyamide resin composition, characterized in that the total amount of sodium oxide (Na ₂ O) and potassium oxide (K ₂ O) is 8 to 12%. The difference in refractive index between the glass filler and the resin component is 0.002 or less for light with a wavelength of 589 nm, 0.002 or less for light with a wavelength of 486 nm, and for light with a wavelength of 656 nm. 0.002 or less,
The amorphous polyamide resin composition according to claim 1, wherein the composition has a parallel light transmittance of 65% or more and a haze of less than 25% when formed into a flat plate having a thickness of 2 mm.   The amorphous substance according to claim 1 or 2, wherein the glass filler has a composition in which a total content of calcium oxide (CaO) and magnesium oxide (MgO) is 2 to 15% in terms of mass% based on oxide. -Soluble polyamide resin composition. The glass filler is a composition in which the total content of silicon oxide (SiO ₂ ) and aluminum oxide (Al ₂ O ₃ ) is 70 to 79% in terms of mass% on an oxide basis. The amorphous polyamide resin composition according to any one of the above. The glass filler, amorphous polyamide resin composition according to any one of claims 1 to 4 which is substantially free composition of titanium oxide (TiO _2).   The amorphous polyamide resin composition according to claim 1, wherein the glass filler content in the amorphous polyamide resin composition is 5 to 40% by mass.   The amorphous polyamide resin composition according to any one of claims 1 to 6, wherein the glass filler is at least one selected from glass fiber, glass powder, glass flake, milled fiber, and glass beads.   An amorphous polyamide resin molded product obtained by molding the amorphous polyamide resin composition according to any one of claims 1 to 7.