JP2023003624A - Polymer alloy, method for manufacturing the same, and transparent component - Google Patents

Abstract

To provide a polymer alloy which suppresses degradation of a resin in the polymer alloy and has high transparency, a method for manufacturing the same, and a transparent component.SOLUTION: A polymer alloy 1 has a matrix resin 11 composed of an aromatic thermoplastic resin, and organic fine particles 12 which are composed of an organic resin, are dispersed in the matrix resin 11 and have a diameter of 0.1 μm or less. When formed in a plate shape with a thickness of 2 mm, the polymer alloy 1 has a color tone exhibiting yellowness of 50 or less. The polymer alloy 1 is obtained by compatibilizing a polymerizable organic compound capable of forming the organic resin 12 in the matrix resin 11, and then polymerizing the polymerizable organic compound in the matrix resin 11.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a polymer alloy, its manufacturing method and a transparent part.

For example, transparent parts such as lenses, head-up display screens, and meter panels must be colorless and transparent, have low birefringence, and have excellent scratch resistance, weather resistance, heat resistance, and impact resistance. is required. However, conventional transparent resins have the problem that it is difficult to satisfy all of these properties. For example, polycarbonate resin, which is well known as a transparent resin, has excellent transparency, heat resistance, and impact resistance, but it is difficult to improve scratch resistance and weather resistance, and birefringence tends to increase. Further, for example, methacrylic resins are excellent in transparency, scratch resistance, weather resistance, etc., but it is difficult to improve heat resistance and impact resistance.

On the other hand, conventionally, a technique has been proposed for obtaining a polymer alloy having the advantages of each polymer by mixing a plurality of types of polymers. For example, in Patent Document 1, polycarbonate (PC); 97-60% by weight and polymethyl methacrylate (PMMA); method is described.

JP 2009-196196 A

In the melt-kneading method of Patent Document 1, two types of resins are kneaded by applying a high shearing force to reduce the size of the dispersed phase of polymethyl methacrylate in polycarbonate, thereby obtaining a transparent polymer alloy. . However, in the melt-kneading method of Patent Document 1, there is a problem that polycarbonate and polymethyl methacrylate deteriorate due to high shear during kneading, and tend to have a yellowish color tone.

The present invention has been made in view of such problems, and it is an object of the present invention to provide a highly transparent polymer alloy in which deterioration of the resin contained in the polymer alloy is suppressed, a method for producing the same, and a transparent part. be.

One aspect of the present invention is a matrix resin (11) made of an aromatic thermoplastic resin,
Organic fine particles (12) made of an organic resin and having a diameter of 0.1 μm or less dispersed in the matrix resin,
The polymer alloy (1) has a color tone exhibiting a yellowness index of 50 or less when molded into a plate having a thickness of 2 mm.

Another aspect of the present invention is a method for producing the polymer alloy according to the above aspect,
A polymerizable organic compound capable of forming the organic resin is dissolved in the matrix resin,
Next, the method for producing a polymer alloy comprises forming the organic fine particles in the matrix resin by polymerizing the polymerizable organic compound in the matrix resin.

Yet another aspect of the present invention resides in a transparent component comprising the polymer alloy of the above aspect.

The matrix resin (11) of the polymer alloy (1) is an aromatic thermoplastic resin excellent in transparency, heat resistance and impact resistance. By dispersing organic fine particles (12) made of an organic resin and having a diameter of 0.1 μm or less in this matrix resin, the properties of the organic fine particles can be imparted to the polymer alloy. Moreover, the polymer alloy has a color tone in which the degree of yellowness falls within the specific range. In such a polymer alloy, deterioration of the organic resin forming the matrix resin and the organic fine particles is suppressed.

Further, in the production method of the above aspect, after the polymerizable organic compound is dissolved in the matrix resin, the polymerizable organic compound is polymerized in the matrix resin. The polymerizable organic compound in the matrix resin becomes less compatible with the matrix resin as the polymerization reaction progresses and the molecular weight increases. When the polymerization reaction further proceeds, spinodal decomposition spontaneously forms organic fine particles having a diameter of 0.1 μm or less in the matrix resin.

Furthermore, in the production method, since it is not necessary to apply high shear to the matrix resin and the polymerizable organic compound when polymerizing the polymerizable organic compound, the matrix resin and the polymerizable organic compound are not mixed during the production process of the polymer alloy. Avoid exposure to extreme temperatures. As a result, yellowing of the polymer alloy due to thermal deterioration can be suppressed. Therefore, according to the production method, a highly transparent polymer alloy can be easily obtained.

Moreover, the transparent part of the above aspect has high transparency because it is composed of the polymer alloy.

As described above, according to the above aspect, deterioration of the resin contained in the polymer alloy is suppressed, and it is possible to provide a highly transparent polymer alloy, a method for producing the same, and a transparent part.
It should be noted that the symbols in parentheses described in the claims and the means for solving the problems indicate the corresponding relationship with the specific means described in the embodiments described later, and limit the technical scope of the present invention. not a thing

1 is a cross-sectional view showing a main part of a polymer alloy according to Embodiment 1. FIG. FIG. 2 is a partial cross-sectional view showing an example of a transparent component in Embodiment 2. FIG.

(Embodiment 1)
An embodiment of the polymer alloy 1 and its manufacturing method will be described with reference to FIG. As shown in FIG. 1, the polymer alloy 1 has a matrix resin 11 made of an aromatic thermoplastic resin and organic fine particles 12 made of an organic resin and having a diameter of 0.1 μm or less dispersed in the matrix resin 11. are doing. The polymer alloy 1 has a color tone exhibiting a yellowness index of 50 or less when molded into a plate having a thickness of 2 mm.

The matrix resin 11 in the polymer alloy 1 is an aromatic thermoplastic resin. As the aromatic thermoplastic resin, a transparent thermoplastic resin containing an aromatic ring in its molecular structure can be used. More specifically, examples of aromatic thermoplastic resins include aromatic polycarbonate resins, polystyrene resins, polyamideimide resins, polyetherimide resins, polyethersulfone resins, and polyethylene naphthalate resins.

The aromatic polycarbonate resin contains one or more types of structural units and carbonate bonds, and the structural units are bonded to each other via the carbonate bonds. In addition, one or more types of structural units containing aromatic rings are contained in the aromatic polycarbonate resin.

Examples of aromatic polycarbonates include bisphenol A-type polycarbonate resins containing structural units derived from bisphenol A, special bisphenol-type polycarbonate resins containing structural units derived from bisphenols other than bisphenol A, and the like. Examples of bisphenol A polycarbonate resins include "Iupilon (registered trademark) S-2000" manufactured by Mitsubishi Engineering-Plastics Co., Ltd., "Panlite (registered trademark) 1255Y" manufactured by Teijin Limited, and "Panlite (registered trademark)". L-1255Z100M" and other commercial products can be used. As the special bisphenol-type polycarbonate resin, for example, commercially available products such as "Iupizeta (registered trademark) EP4000" and "Iupizeta EP5000" manufactured by Mitsubishi Gas Chemical Company, Inc. can be used.

Polystyrene resins contain structural units derived from styrene and/or styrene derivatives. As the polystyrene resin, for example, commercially available products such as "Dick Styrene (registered trademark) GPPS CR-3500" manufactured by DIC Corporation and "Toyo Styrol (registered trademark) GP G320C" manufactured by Toyo Styrene Co., Ltd. can be used. .

The polyamide-imide resin contains one or more types of structural units, amide bonds and imide bonds, and the structural units are bonded to each other via amide bonds or imide bonds. Moreover, one or more structural units containing an aromatic ring are contained in the polyamide-imide resin. As the polyamide-imide resin, for example, commercially available products such as "Vylomax (registered trademark) HR-15ET" manufactured by Toyobo Co., Ltd. and "Torlon (registered trademark) 4203L" manufactured by Solvay Specialty Polymers Japan Co., Ltd. can be used. .

The polyetherimide resin contains one or more types of structural units, ether bonds and imide bonds, and the structural units are bonded to each other via ether bonds or imide bonds. Further, the polyetherimide resin contains one or more types of structural units containing an aromatic ring. As the polyetherimide resin, for example, commercially available products such as "ULTEM (registered trademark) 1000" and "ULTEM 1010" manufactured by SHPP Japan Co., Ltd. can be used.

The polyethersulfone resin contains aromatic rings, ether linkages and sulfone groups ( _--SO.sub.2-- ), and the aromatic rings are linked via ether linkages or sulfone groups. As the polyethersulfone resin, for example, commercially available products such as "Sumika Excel (registered trademark) 4100G" manufactured by Sumitomo Chemical Co., Ltd. and "Veradel (registered trademark) 3600" manufactured by Solvay Specialty Polymers Japan Co., Ltd. can be used. .

The polyethylene naphthalate resin contains one or more types of structural units and ester bonds, and the structural units are bonded to each other via the ester bonds. Moreover, one or more types of structural units containing a naphthalene ring are contained in the polyethylene naphthalate resin. As the polyethylene naphthalate resin, for example, commercially available products such as "Teonex (registered trademark) TN8050SC" and "Teonex TN8065S" manufactured by Teijin Limited can be used.

The matrix resin 11 in the polymer alloy 1 is preferably aromatic polycarbonate resin. Among aromatic thermoplastic resins, aromatic polycarbonate resins are less colored and are excellent in transparency and heat resistance. Therefore, by using the aromatic polycarbonate resin as the matrix resin 11, the coloring of the polymer alloy 1 can be reduced, the transparency can be improved, and the heat resistance can be improved. Aromatic polycarbonate resins are also suitable from the viewpoint of easy availability. Furthermore, by dispersing the organic fine particles 12 in the matrix resin 11 made of aromatic polycarbonate resin, the retardation of the polymer alloy 1 can be easily reduced. From these points of view, it is more preferable to use a bisphenol A-type polycarbonate resin as the matrix resin 11 among the aromatic bisphenol resins.

The matrix resin 11 may contain additives such as an antioxidant, an ultraviolet absorber, and a hydrophilic agent, if necessary. The content of the additive can be appropriately set, for example, within a range of 10 parts by mass or less with respect to 100 parts by mass of the matrix resin 11 .

In the matrix resin 11, organic fine particles 12 made of an organic resin and having a diameter of 0.1 μm or less are dispersed. By setting the diameter of the organic fine particles 12 in the matrix resin 11 to 0.1 μm or less, the properties of the organic resin can be imparted to the polymer alloy 1 without impairing the transparency of the polymer alloy 1 as a whole. If the matrix resin 11 contains an excessively large amount of the organic fine particles 12 having a diameter exceeding 0.1 μm, the polymer alloy 1 may become cloudy. From the viewpoint of further increasing the transparency of the polymer alloy 1, the diameter of the organic fine particles 12 is preferably 0.08 μm or less, more preferably 0.06 μm or less.

The diameter of the organic fine particles 12 in the polymer alloy 1 is the equivalent circle diameter of the organic fine particles 12 present within the field of view when the cross section of the polymer alloy 1 is observed with an electron microscope. The field area, observation position, and the like in electron microscope observation may be appropriately set so that the number of organic fine particles 12 whose equivalent circle diameters are measured is, for example, 100 or more.

The lower limit of the diameter of the organic fine particles 12 in the polymer alloy 1 is not particularly limited. When the polymer alloy 1 is produced by the production method described later, the lower limit of the diameter of the organic fine particles 12 in the polymer alloy 1 is, for example, about 0.0001 μm to 0.0003 μm.

The content of the organic fine particles 12 in the polymer alloy 1 can be appropriately set, for example, within a range of 1 part by mass or more and 40 parts by mass or less with respect to a total of 100 parts by mass of the matrix resin 11 and the organic fine particles 12 . By setting the content of the organic fine particles 12 to preferably 1 part by mass or more, more preferably 3 parts by mass or more, and even more preferably 5 parts by mass or more with respect to a total of 100 parts by mass of the matrix resin 11 and the organic fine particles 12 , the function of the organic resin constituting the organic fine particles 12 can be imparted to the polymer alloy 1 more reliably. In addition, the content of the organic fine particles 12 is preferably 40 parts by mass or less, more preferably 20 parts by mass or less, and even more preferably 15 parts by mass or less with respect to a total of 100 parts by mass of the matrix resin 11 and the organic fine particles 12. Thus, the function of an organic resin can be imparted to the polymer alloy 1 without impairing the transparency of the polymer alloy 1 .

In the organic resin forming the organic fine particles 12, one or more monomers are polymerized. The organic resin that constitutes the organic fine particles 12 is not particularly limited, and an organic resin having a function to be imparted to the polymer alloy 1 can be used. For example, in order to impart scratch resistance and weather resistance to the polymer alloy 1, a (meth)acrylic resin may be used as the organic resin. The (meth)acrylic resin constituting the organic fine particles 12 is, for example, a monofunctional (meth)acrylate monomer having one (meth)acryloyl group in the molecule, such as isobornyl methacrylate and 2-phenoxyethyl methacrylate. , neopentyl glycol dimethacrylate, 1,3-butylene diol dimethacrylate and ethoxylated bisphenol A dimethacrylate, bifunctional (meth)acrylate monomers having two (meth)acryloyl groups in the molecule, pentaerythritol tetra It may contain structural units derived from tetrafunctional (meth)acrylate monomers having four (meth)acryloyl groups in the molecule, such as acrylate and ditrimethylolpropane tetraacrylate.

Epoxy resin may be used as the organic resin to impart adhesiveness and weather resistance to the polymer alloy 1 . Epoxy resins used for the organic fine particles 12 include, for example, bisphenol-type epoxy resins represented by bisphenol A-type epoxy resins and bisphenol F-type epoxy resins, glycidylamine-type polyfunctional epoxy resins using polyfunctional glycidylamine as a curing agent, Epoxy resins having flexible skeletons such as urethane-modified epoxy resins and rubber-modified epoxy resins, aliphatic epoxy resins having structural units derived from aliphatic alcohols such as ethylene glycol and glycerin, and alicyclic epoxy resins. be done.

The polymer alloy 1 has a color tone exhibiting a yellowness index of 50 or less when molded into a plate having a thickness of 2 mm. The yellowness of the polymer alloy 1 shows a large value when the matrix resin 11 is degraded. In the polymer alloy 1 in which the degree of yellowness of the polymer alloy 1 is within the specific range, deterioration of the organic resins forming the matrix resin 11 and the organic fine particles 12 is sufficiently suppressed. Further, by setting the yellowness of the polymer alloy 1 within the specific range, the color tone of the polymer alloy 1 can be made close to colorless. From this point of view, the yellowness of Polymer Alloy 1 is preferably 40 or less, more preferably 30 or less, even more preferably 25 or less, and particularly preferably 20 or less.

The yellowness of the polymer alloy is a value measured by a method conforming to JIS K7373:2006.

It is preferable that the polymer alloy 1 has a characteristic of having a transmittance of 50% or more at a wavelength of 600 nm when molded into a plate having a thickness of 2 mm. The polymer alloy 1 having such properties is suitable for transparent parts. From this point of view, when the polymer alloy 1 is formed into a plate with a thickness of 2 mm, it is more preferable that the transmittance at a wavelength of 600 nm is 55% or more, and more preferably 60% or more. It is more preferable to have

In preparing the polymer alloy 1 , first, a polymerizable organic compound capable of forming the organic resin is dissolved in the matrix resin 11 .
Next, the organic fine particles 12 are formed in the matrix resin 11 by polymerizing the polymerizable organic compound in the matrix resin 11 .
The polymer alloy 1 can be obtained by the above.

In the manufacturing method, the method for making the matrix resin 11 and the polymerizable organic compound compatible is not particularly limited, and various methods can be adopted. For example, the matrix resin 11 and the polymerizable organic compound are put into an extruder or a kneader, and the matrix resin 11 and the polymerizable organic compound are kneaded in the apparatus, whereby the polymerizable organic compound is mixed in the matrix resin 11. can be compatible with each other.

In the manufacturing method, if necessary, a step of mixing an additive, a polymerization catalyst for polymerizing the polymerizable organic compound, or the like with the matrix resin 11 may be performed. The operation of mixing additives, polymerization catalysts, etc. with the matrix resin 11 may be performed at any time before the step of polymerizing the polymerizable organic compound. That is, for example, the matrix resin 11 may be mixed with the additive or the like, and then the polymerizable organic compound may be dissolved in the matrix resin 11. Alternatively, the matrix resin 11 may be mixed with the polymerizable organic compound, and then the matrix resin may be mixed. 11 may be mixed with an additive or the like. Further, for example, a step of mixing the matrix resin 11 with the additive or the like by previously mixing the polymerizable organic compound and the additive or the like and then mixing the mixture with the matrix resin 11; The step of compatibilizing the polymerizable organic compound therein can also be performed as a single step.

In the step of making the matrix resin 11 compatible with the polymerizable organic compound and the step of mixing the matrix resin 11 with additives and the like, the matrix resin 11 may be softened by heating, if necessary. The heating temperature of the matrix resin 11 may be appropriately set according to the material of the matrix resin 11 .

For example, when both the polymerizable organic compound and the polymerization catalyst are contained in the matrix resin 11, the heating temperature of the matrix resin 11 is kept as low as possible to prevent the polymerization reaction of the polymerizable organic compound during the mixing operation. can be sufficiently dissolved with the matrix resin 11 and the polymerizable organic compound while suppressing the As a result, the formation of coarse organic fine particles 12 in the finally obtained polymer alloy 1 can be more effectively suppressed. More specifically, when the matrix resin 11 contains both a polymerizable organic compound and a polymerization catalyst, the heating temperature of the matrix resin 11 is preferably 150° C. or higher and 280° C. or lower. ° C. or higher and 250 °C or lower, and more preferably 180 °C or higher and 230 °C or lower.

In the manufacturing method, after the polymerizable organic compound is dissolved in the matrix resin 11, the polymerizable organic compound in the matrix resin 11 is polymerized. As the polymerization reaction of the polymerizable organic compound progresses in the matrix resin 11 and the degree of polymerization of the organic resin increases, the compatibility between the organic resin and the matrix resin 11 decreases. When the organic resin becomes incompatible with the matrix resin 11, the organic fine particles 12 are spontaneously formed in the matrix resin 11 by spinodal decomposition. As a result, polymer alloy 1 can be obtained.

A method for polymerizing the polymerizable organic compound in the matrix resin 11 is not particularly limited, and a method according to the mode of the polymerization reaction can be adopted. For example, when the polymerization reaction is promoted by heat, the polymerizable organic compound may be polymerized in the matrix resin 11 by heating the matrix resin 11 in which the polymerizable organic compound is compatible. Alternatively, the polymerizable organic compound may be polymerized in the matrix resin 11 by heating while kneading a mixture of the matrix resin 11 and the polymerizable organic compound in an extruder or kneader. When the polymerizable organic compound is polymerized using an extruder or kneader, the polymerizable organic compound is dissolved in the matrix resin 11 and then polymerized using the same device. Alternatively, the polymerizable organic compound may be polymerized using a device other than the device used for making the polymerizable organic compound compatible with the matrix resin 11 .

The shape of the polymer alloy 1 obtained by the manufacturing method is not particularly limited. For example, pellets of the polymer alloy 1 can be obtained by producing strands of the polymer alloy 1 using an extruder and then cutting the strands using a pelletizer. A transparent part having a desired shape can be obtained by molding the pellets of the polymer alloy 1 obtained in this way, for example, using a method such as injection molding or compression molding.

Further, for example, a transparent part having a desired shape can be obtained by polymerizing the polymerizable organic compound in the matrix resin 11 in an injection molding apparatus and then injection molding the polymer alloy 1 in a molten state. .

(Embodiment 2)
In this embodiment, an example of a transparent part made of the polymer alloy will be described with reference to FIG. It should be noted that, of the reference numerals used in the second and subsequent embodiments, the same reference numerals as those used in the previous embodiments represent the same components and the like as those in the previous embodiments, unless otherwise specified.

The polymer alloy 1 of Embodiment 1 can be applied to various transparent parts 2 . The transparent component 2 may be, for example, the screen 21 of the head-up display 3 as shown in FIG. The head-up display 3 shown in FIG. 3 holds a circuit board 31, a light source 32 held by the circuit board 31, a magnifying mirror 33 arranged on an optical path L of light generated from the light source 32, and a magnifying mirror 33. and a screen 21 arranged on the optical path L of the light reflected by the magnifying mirror 33 . An adhesive 35 is interposed between the circuit board 31 and the light source 32, and between the magnifying mirror 33 and the stay 34, and these constituent members are bonded via the adhesive 35. FIG.

The polymer alloy 1 of Embodiment 1 can be applied to various transparent parts 2 such as lenses and meter panels in addition to the screen 21 for the head-up display 3 .

The refractive index of the transparent part made of the polymer alloy 1 may have anisotropy, and in this case, the light passing through the transparent part may have a phase difference. The phase difference is expressed as the product of the birefringence of the transparent component and the distance of light transmitted through the transparent component. A transparent part having a phase difference changes the polarization state of light that passes through the transparent part. Therefore, for example, when the light that has passed through the transparent part passes through a polarizer, there is a decrease in brightness and the occurrence of iridescent unevenness. problems. From the viewpoint of avoiding these problems, the smaller the phase difference of the transparent component, the better.

(Experimental example)
In this example, a more specific configuration example of the polymer alloy 1 according to Embodiment 1 will be described together with a manufacturing method. The matrix resin, polymerizable organic compound and polymerization catalyst used in this example are as follows.

・Polymer P1: Aromatic polycarbonate resin ("Panlite 1255Y" manufactured by Teijin Limited)
・Polymer P2: Aromatic polycarbonate resin ("Panlite 1255" manufactured by Teijin Limited)
・Polymer P3: acrylic resin (manufactured by Mitsubishi Chemical Corporation "Acrypet (registered trademark) VHS-001")

Monomer M1: Isobornyl methacrylate Monomer M2: Neopentylglycol dimethacrylate Monomer M3: Pentaerythritol tetraacrylate Monomer M4: Ethoxylated bisphenol A dimethacrylate Monomer M5: Epoxy compound (Mitsubishi Chemical Corporation "jER ( Registered Trademark) 828”
・ Monomer M6: epoxy compound ("jER 806" manufactured by Mitsubishi Chemical Corporation)

・Polymerization catalyst C1: di-t-amyl peroxide ・Polymerization catalyst C2: epoxy resin curing agent ("jER Cure (registered trademark) DICY15" manufactured by Mitsubishi Chemical Corporation)

In preparing the polymer alloy 1 of this example, the polymer P1 and the polymer P2 were used as the matrix resin 11, which had been previously dried by being held at a temperature of 80° C. for 12 hours in a vacuum. Separately from the preparation of the matrix resin 11, the polymerizable organic compounds (monomers M1 to M6) and the polymerization catalyst are mixed in advance in the mass ratio shown in Table 1, and the mixture of the polymerizable organic compound and the polymerization catalyst is prepared. made.

Next, either the polymer P1 or the polymer P2 is put into a kneader ("Laboplastomill (registered trademark)" manufactured by Toyo Seiki Co., Ltd.) as the matrix resin 11, and the matrix resin 11 is mixed while being heated at a temperature of 200°C. was kneaded to melt the matrix resin 11 . Next, a mixture of a polymerizable organic compound and a polymerization catalyst was added at the mass ratio shown in Table 1 to the matrix resin 11 in the kneader. The contents of the kneader were kneaded at a temperature of 200° C. for 7 minutes, thereby making the polymerizable organic compound compatible with the matrix resin 11 and simultaneously polymerizing the polymerizable organic compound. The number of revolutions of the screw in the kneader was 150 rpm. As a result, polymer alloys 1 (test materials S1 to S9) shown in Table 1 were obtained.

The test materials R1 to R4 shown in Table 1 are test materials for comparison with the test materials S1 to S9. The test material R1 was prepared by mixing the polymer P1 and the polymer P3, which had been dried by holding in a vacuum at a temperature of 80° C. for 12 hours, at the mass ratio shown in Table 1, and kneading them using a kneader. Except for this, the method for producing the test materials S1 to S9 is the same as that of the test materials S1 to S9.

In preparing the test material R2, the mass ratios shown in Table 1 were blended. Polymer P1 and polymer P3 were put into a micro-volume high-shear molding machine, melted in the machine, and then polymer P3 was dispersed in polymer P1 by applying a high shear force. More specifically, the temperature of polymer P1 and polymer P3 in the processing machine was set to 250° C., and the rotation speed of the screw of the processing machine was set to 3000 rpm. The residence time of polymer P1 and polymer P3 in the processing machine was about 1 to 2 minutes.

The properties of the test materials S1 to S9 and the test materials R1 to R4 thus obtained were evaluated by the following methods.

[Diameter of organic fine particles]
After cutting the test material into a suitable cross section, the shape of the cross section was observed using an electron microscope. Then, the circle-equivalent diameter of the organic fine particles present in the field of view of 0.4 μm in length and 0.4 μm in width was calculated, and this value was taken as the diameter of the organic fine particles. In the column of "diameter of organic fine particles" in Table 1, the symbol "A+" is given when the maximum value of the diameter of the organic fine particles is 0.05 µm or less, and the symbol "A", and when exceeding 0.10 μm, the symbol "B" was described.

[transparency]
Each test material was formed into a plate shape of 100 mm long, 100 mm wide and 2 mm thick by hot press molding, and used as a test piece for evaluating transparency. Using an ultraviolet-visible-near-infrared spectrophotometer (“V-550” manufactured by JASCO Corporation), the transmittance of the test piece at a wavelength of 600 nm was measured. In the "transparency" column of Table 1, the symbol "A+" is used when the transmittance of the test piece at a wavelength of 600 nm is 55% or more, the symbol "A" when it is 50% or more and less than 55%, and when it is less than 50% The symbol "B" is described in . In the evaluation of transparency, the symbols "A+" and "A", in which the transmittance of the test piece at a wavelength of 600 nm was 50% or more, were judged as acceptable because of their high transparency.

[Yellowness]
Each test material was formed into a plate having a length of 100 mm, a width of 100 mm and a thickness of 2 mm by hot press molding, and used as a test piece for yellowness measurement. Using a near-infrared spectrophotometer ("USPM-RU-WRD" manufactured by Olympus Corporation), the yellowness of the test piece was measured according to the method specified in JIS K7373:2006. In the "yellowness index" column of Table 1, the symbol "A+" is indicated when the yellowness index of the test piece is less than 40, the symbol "A" is indicated when it is 40 or more and 50 or less, and the symbol "B" is indicated when it exceeds 50. bottom. For test material R3, since the test piece was opaque and the yellowness could not be measured, a symbol "-" was entered in the same column. In the evaluation of transparency, the yellowness degree of the test piece of "A+" and "A" of 50% or less was judged to be acceptable because the yellowing of polymer alloy 1 was small.

[Phase difference]
Each test material was molded into a plate having a length of 100 mm, a width of 100 mm, and a thickness of 2 mm by hot press molding to obtain a test piece for phase difference measurement. Using a two-dimensional birefringence evaluation system (“WPA-200” manufactured by Photonic Lattice Co., Ltd.), the phase difference of the test piece was measured. In the "retardation" column of Table 1, the symbol "A+" is indicated when the retardation of the test piece is less than 20 nm, the symbol "A" when it is 20 nm or more and 30 nm or less, and the symbol "B" when it exceeds 30 nm. bottom. For test material R3, since the test piece was opaque and the retardation could not be measured, a symbol "-" was entered in the same column.

[Heat-resistant]
After forming each test material into a plate shape of 100 mm long, 100 mm wide and 2 mm thick by hot press molding, the plate was cut to obtain a test piece for heat resistance measurement of 30 mm long, 10 mm wide and 2 mm thick. Using a dynamic viscoelasticity device ("RSA G2" manufactured by TA Instruments Japan Co., Ltd.), tan δ at various temperatures while increasing the temperature of the test piece, that is, the loss elasticity for the storage elastic modulus E' The ratio of E'' was measured. The tan δ peak temperature of the matrix resin contained in the test piece was taken as the glass transition temperature of the matrix resin.

In the "Heat resistance" column of Table 1, the code "A+" is given when the glass transition temperature of the matrix resin contained in the test piece is 150 ° C. or higher, and the code "A" is given when it is 145 ° C. or higher and lower than 150 ° C. The symbol "B" is indicated when the temperature is less than °C.

As shown in Table 1, the test materials S1 to S9 are composed of a matrix resin 11 made of an aromatic thermoplastic resin and an organic resin, and organic fine particles having a diameter of 0.1 μm or less dispersed in the matrix resin 11. 12 and . Moreover, the test materials S1 to S9 have a color tone exhibiting a yellowness index of 50 or less when formed into a plate shape with a thickness of 2 mm. These test materials have high transparency, and deterioration of the organic resin forming the matrix resin 11 and the organic fine particles 12 during the manufacturing process is suppressed. Moreover, the test materials S1 to S9 can impart the function of the organic resin constituting the organic fine particles 12 to the polymer alloy 1 while maintaining transparency.

On the other hand, the test material R1 is composed of an aromatic polycarbonate resin, and the organic fine particles 12 are not contained in the aromatic polycarbonate. Therefore, the test material R1 is not imparted with the function of the organic resin constituting the organic fine particles 12, and has a larger phase difference than the test materials S1 to S9.

The test material R2 is made of methacrylic resin, and the organic fine particles 12 are not contained in the methacrylic resin. Therefore, the test material R2 is inferior in heat resistance to the test materials S1 to S9 in which the aromatic polycarbonate resin is used as the matrix resin.

Since the test material R3 is obtained by kneading the aromatic polycarbonate resin and the methacrylic resin by a general method, the diameter of the methacrylic resin in the aromatic polycarbonate resin is large. Therefore, the test material R3 has lower transparency than the test materials S1 to S9.

Since the test material R4 was obtained by kneading the aromatic polycarbonate resin and the methacrylic resin by applying a high shearing force, the deterioration of the aromatic polycarbonate resin progressed during the manufacturing process. Therefore, the test material R4 has a higher degree of yellowness than the test materials S1 to S9.

The present invention is not limited to the above embodiments, and can be applied to various embodiments without departing from the scope of the invention.

REFERENCE SIGNS LIST 1 polymer alloy 11 matrix resin 12 organic fine particles

Claims (6)

a matrix resin (11) made of an aromatic thermoplastic resin;
Organic fine particles (12) made of an organic resin and having a diameter of 0.1 μm or less dispersed in the matrix resin,
A polymer alloy (1) having a color tone exhibiting a yellowness index of 50 or less when molded into a plate having a thickness of 2 mm. 2. The polymer alloy according to claim 1, wherein the aromatic thermoplastic resin constituting said matrix resin is an aromatic polycarbonate resin. 3. The polymer alloy according to claim 1, wherein the organic resin constituting the organic fine particles is a (meth)acrylic resin. The polymer alloy according to any one of claims 1 to 3, wherein the content of the organic fine particles is 1 part by mass or more and 40 parts by mass or less with respect to a total of 100 parts by mass of the matrix resin and the organic fine particles. . A method for producing the polymer alloy according to any one of claims 1 to 4,
dissolving a polymerizable organic compound capable of forming the organic resin in the matrix resin,
Next, a method for producing a polymer alloy, wherein the organic fine particles are formed in the matrix resin by polymerizing the polymerizable organic compound in the matrix resin. A transparent part (2) made of the polymer alloy according to any one of claims 1-4.

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