JP2006089568A - Resin composition, preparation method of the resin composition and filler for the resin composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin composition which essentially comprises a polycarbonate resin and is excellent in transparency, color tone and physical properties such as mechanical strength, dimensional stability and heat resistance. <P>SOLUTION: The resin composition is composed of the polycarbonate resin and a metal oxide particle dispersed therein. The metal oxide particle has a sodium ion content of ≤10 ppm calculated in terms of oxide. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a resin composition having excellent physical properties such as mechanical strength, dimensional stability, heat resistance and impact resistance and having transparency, a method for producing the same, and a filler for resin compositions.

  Polycarbonate resins are known as engineering plastics with excellent heat resistance, impact resistance, transparency, etc., and are widely used in many fields such as automobiles, machinery, electricity, electronics, optical recording media, building materials, and miscellaneous goods. .

  On the other hand, as a method for improving physical properties such as mechanical strength, heat resistance and dimensional stability of the resin composition, a composite material using a nanometer-order filler instead of a conventional reinforced resin such as glass fiber or talc, so-called Polymer nanocomposites have attracted attention. Examples of such composite materials include Toyoda Chuken's “Composite Materials and Method for Producing the Same” (Patent No. 2519045), Ube Industries et al. “Polyamide Composite Material and Method for Producing the Same (Japanese Patent Publication No. 7-47644)”, Showa An example is “Polyolefin-based composite material and manufacturing method thereof (JP-A-10-30039)” by Denko.

  In polymer nanocomposites using nanometer-order level fillers as described above, improving dispersibility of fine fillers and improving interaction between fillers and polymers are one of the major points for improving physical properties. It is hard to say that sufficient physical properties have been obtained.

  In addition, when a layered compound similar to the above example is dispersed in a polycarbonate resin, transparency, which is one of the characteristics of the polycarbonate resin, is impaired. This is because the layered compound has a nanometer order level in the thickness direction although it depends on the degree of peeling, and does not interfere with visible light, but the surface direction has a size on the order of μm and thus scatters visible light. .

  Therefore, in Japanese Patent Application Laid-Open No. 11-343349 and Japanese Patent Application No. 2002-207816, nanometer-order metal oxide fine particles are blended in a transparent resin material such as an acrylic resin and a polycarbonate resin, and mechanical properties and thermal properties are maintained while maintaining transparency. I have a proposal to improve. However, according to these inventions, although certain physical property improvements are recognized, the polycarbonate resin cannot sufficiently satisfy transparency and physical properties. This is thought to be due to the lack of interaction and dispersibility, particularly dispersibility. In these inventions, a technique for dispersing a filler with an acrylic resin is presented. According to this method, excellent dispersibility can be expected, but no concrete and sufficient solution has been proposed for a polycarbonate resin.

  In these inventions, colloidal silica and aerosil are exemplified as nanometer-order metal oxide fine particles. However, in our study, when the former is dispersed in a polycarbonate resin, coloration and molecular weight reduction may occur. I know it. Further, it has been found that so-called gas phase method silica such as the latter Aerosil cannot obtain sufficient transparency because of its large secondary particle size.

  The present invention has been made in view of the above-described conventional problems, and is mainly composed of a polycarbonate resin having excellent physical properties such as mechanical strength, dimensional stability, and heat resistance, and excellent transparency and color tone. An object of the present invention is to provide a resin composition.

In order to solve the above problems, the present invention provides:
Polycarbonate resin,
Metal oxide particles dispersed in the polycarbonate resin, the content of sodium ions being 10 ppm or less in terms of oxides;
It is related with the resin composition characterized by comprising.

  By adding a filler to a resin composition mainly composed of a polycarbonate resin, the present inventors can simultaneously satisfy the mechanical strength, dimensional stability, transparency, color tone, and the like. Intense study was conducted to obtain a composition. As a result, in conventional metal oxide particles, the mechanical strength and the like of the polycarbonate resin mixed with the metal oxide particles are improved by appropriately controlling the particle size and the like, for example, narrowing down to the nanometer order. On the other hand, it has been found that the cause of coloring and the like is due to sodium ions contained in the metal oxide particles. That is, it is expected that sodium ions in the metal oxide react with the monomer and the elimination phenol at a high temperature to generate, for example, quinones.

  On the other hand, in order to increase the dispersibility of the metal oxide particles in the resin composition, when the metal oxide particles are added in the polymerization process of the resin composition, the sodium ions are converted into a depolymerization catalyst for the polycarbonate resin. In other words, the reverse reaction proceeds and inhibits the polymerization, which causes the degree of polymerization of the resin composition to be insufficient.

  In view of this point, the present inventors diligently studied to reduce the content of sodium ions in the metal oxide particles, and as defined in the present invention, sodium in the metal oxide particles. It has been found that by adjusting the ion content to 10 ppm or less in terms of oxides, the above-mentioned coloring problem and further the problem of insufficient polymerization due to addition during the polymerization process can be solved.

Here, the "oxide equivalent" refers to calculate the content assuming sodium ions present all Na 2 _O. “Metal oxide particles having a sodium ion content of 10 ppm or less in terms of oxide” means that when the metal oxide particles used for the synthesis of the resin composition are in the form of a solid powder, they are contained in the particles or on the surface. It indicates that the amount of Na ₂ O adsorbed is 10 ppm or less with respect to the whole particle. When the metal oxide particles used for the synthesis are colloidal, the amount of Na ₂ O contained in the colloid is in the whole particle. In contrast, it is 10 ppm or less.

  As described above, according to the present invention, in the polycarbonate resin, the resin composition is formed by containing metal oxide particles having a sodium ion content of 10 ppm or less in terms of oxide. The mechanical properties, dimensional stability, heat resistance and other physical properties, transparency, color tone, etc. of the resin composition can be sufficiently improved.

  Details of the present invention, as well as other features and advantages, are described in detail below.

(Filler)
In the present invention, it is necessary to contain, as a filler, metal oxide particles having a sodium ion content of 10 ppm or less in terms of oxide in the polycarbonate resin. If it is 10 ppm or less, the mechanical properties, dimensional stability, heat resistance and other physical properties, transparency, color tone and the like of the resin composition can be sufficiently improved. However, if it exceeds 10 ppm, sodium ions contained in the metal oxide particles react with the monomer and the elimination phenol at a high temperature, and for example, quinones and the like may be colored, which may cause coloring.

  The metal oxide particles are not particularly limited as long as the above-described requirements are satisfied. In particular, the metal oxide particles are preferably metal oxide particles formed by condensation polymerization of a metal alkoxide, so-called sol-gel method. For example, when colloidal silica is taken as an example, there is a representative one using water glass as a raw material. However, this contains a large amount of sodium ions, and its removal is difficult and increases the cost. Is not suitable. In addition, there is a vapor phase silica typified by Aerosil as high-purity silica particles, but the secondary particle size is large and the transparency of the resin composition is lowered, so that the transparency of the polycarbonate resin is to be actively used. Is not optimal.

  Examples of the metal alkoxide include tetraalkoxysilane, trialkoxyaluminum, and tetraalkoxytitanium. These may be used alone or in combination of two or more.

  Examples of the tetraalkoxysilane include tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane, tetraisopropoxysilane, tetrabutoxysilane, tetraisobutoxysilane, and the like. When the number of carbon atoms of the alkoxy group contained in the tetraalkoxysilane is too large, polycondensation may be insufficient, and tetramethoxysilane and tetraethoxysilane are particularly preferable.

  Examples of trialkoxyaluminum include trimethoxyaluminum, triethoxyaluminum, tripropoxyaluminum, triisopropoxyaluminum, tributoxyaluminum, triisobutoxyaluminum, tris (2-methylpropoxy) aluminum, tris (pentyloxy) aluminum, Examples include tris (2-ethylbutoxy) aluminum, tris (octyloxy) aluminum, and tris (2-ethylhexyloxy) aluminum. If the number of carbon atoms of the alkoxy group contained in the trialkoxyaluminum is too large, condensation polymerization may be insufficient, and if the number of carbon atoms of the alkoxy group is too small, the reactivity may become high and reaction control may be difficult. Therefore, triethoxyaluminum, tripropoxyaluminum and triisopropoxyaluminum are particularly preferable.

  Examples of tetraalkoxytitanium include tetramethoxytitanium, tetraethoxytitanium, tetrapropoxytitanium, tetraisopropoxytitanium, tetrabutoxytitanium, tetraisobutoxytitanium, tetrakis (2-methylpropoxy) titanium, tetrakis (pentyloxy) titanium, Examples include tetrakis (2-ethylbutoxy) titanium, tetrakis (octoxy) titanium, tetrakis (2-ethylhexyloxy) titanium, and the like. If the number of carbon atoms of the alkoxy group contained in the tetraalkoxytitanium is too large, the condensation polymerization may be insufficient, and if the number of carbon atoms of the alkoxy group is too small, the reactivity becomes high and the reaction control becomes difficult. Therefore, tetraethoxytitanium, tetrapropoxytitanium and tetraisopropoxytitanium are particularly preferable.

  The shape of the metal oxide particles is not particularly limited, and not only a general substantially spherical shape but also a rectangular parallelepiped shape, a plate shape, a linear shape such as a fiber, a branched shape, etc. can be used.

  Furthermore, the size of the metal oxide particles is preferably 380 nm or less, and more preferably 100 nm or less. By making the major axis of the particles 380 nm or less, which is the lower limit value of the visible light wavelength, there is almost no scattering of visible light by the particles, and without sacrificing the transparency which is one of the excellent features of the polycarbonate resin, excellent A resin composition having physical properties can be obtained.

  The term “major axis” as used herein refers to the diameter of the filler if it is approximately spherical, the length of one of the longest sides of a rectangular parallelepiped or plate, or the shape of a straight or branched branch like a fiber. The length of the longest line segment.

  Moreover, in order for the resin composition of the present invention to exhibit the target performance as a polymer nanocomposite, at least one side of the metal oxide particles is preferably 1-100 nm, more preferably 1-20 nm. Here, “at least one side” means, for example, the diameter of the particle if it is approximately spherical, at least one side if it is a rectangular parallelepiped or plate, and the thickness cross section if it is a straight shape such as a fiber or a branched branch shape. Of at least the minor axis.

  The metal oxide particles can be composed of any kind of metal oxide. For example, silica, alumina, titania, and composite oxides thereof, for example, those obtained by treating the surface of titania with alumina. It can be illustrated. In view of easy availability, cost, ease of surface treatment described later, and the like, it is particularly preferable to use silica. However, the metal oxide particles of the present invention are not limited to these metal oxides.

  The concentration of the metal oxide particles in the resin composition targeted by the present invention is preferably in the range of 1-60 wt%, more preferably 5-40 wt%. The concentration is determined by the decrease in thermal weight when the resin composition is ashed by heating at 600 ° C. in air for 2 hours. If it is less than 1% by weight, improvement of physical properties may not be recognized. On the other hand, if it exceeds 60% by weight, not only the increase in specific gravity can not be ignored, but also there is a disadvantage in terms of cost, and a decrease in impact strength cannot be ignored. Generally, when a large amount of a filler is added to the resin, the impact strength is reduced. However, in the resin composition of the present invention, as described above, the size of the metal oxide particles is reduced to 1-100 nm, and the order of nanometers. Since the filler having a size of 1 can be uniformly dispersed, the impact strength is practically small. However, if the content exceeds 60% by weight, this may not be ignored.

  In addition, in the metal oxide particle of this invention, what has a hydrophobic group on the surface is preferable. Thereby, the aggregation of the metal oxide particles in the polycarbonate resin can be suppressed, and the dispersibility of the metal oxide particles in the target resin composition can be improved.

  A specific hydrophobic group is preferably at least one of an aromatic hydrocarbon group and an aliphatic hydrocarbon group, and particularly preferably an aromatic hydrocarbon group. Since the polycarbonate resin has an aromatic ring in its polymer chain, introduction of an aromatic hydrocarbon group on the particle surface improves the affinity and facilitates dispersion, and π− due to overlapping of the aromatic rings. This is because π interaction can also be expected.

  Specific examples of the hydrophobic group include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, isopentyl, hexyl, heptyl, octyl, 2-ethylhexyl, nonyl, decyl, dodecyl and other alkyl groups; vinyl, propenyl, iso Alkenyl groups such as propenyl, butenyl, isobutenyl, pentenyl, hexenyl; cycloalkyl groups such as cyclopentyl, cyclohexyl, methylcyclohexyl; phenyl, toluyl, xylyl, cumenyl, mesityl, benzyl, phenethyl, styryl, cinnamyl, benzhydryl, trityl, ethylphenyl , Aryl groups such as propylphenyl, butylphenyl and β-naphthyl.

  The hydrophobic group can be formed, for example, by subjecting the metal oxide particles to a hydrophobic treatment using a surface modifier. The surface modifier is not particularly limited. For example, when silica is used as an example of a metal oxide, organosilicon having at least one of a chloro group, a methoxy group, and an ethoxy group, which has excellent reactivity with a silanol group. Compounds are preferred.

  Examples of the organosilicon compound include methyltrimethoxysilane, dimethyldimethoxysilane, trimethylmethoxysilane, methyltriethoxysilane, dimethyldiethoxysilane, trimethylethoxysilane, ethyltrimethoxysilane, diethyldimethoxysilane, triethylmethoxysilane, ethyl Triethoxysilane, diethyldiethoxysilane, triethylethoxysilane, propyltrimethoxysilane, dipropyldimethoxysilane, tripropylmethoxysilane, propyltriethoxysilane, dipropyldiethoxysilane, tripropylethoxysilane, isobutyltrimethoxysilane, diisobutyl Dimethoxysilane, triisobutylmethoxysilane, isobutyltriethoxysilane, diisobutyldiethoxysilane, Isobutylethoxysilane, phenyltrimethoxysilane, diphenyldimethoxysilane, triphenylmethoxysilane, phenyltriethoxysilane, diphenyldiethoxysilane, triphenylethoxysilane, phenethyltrimethoxysilane, diphenethyldimethoxysilane, triphenethylmethoxysilane, phenethyltriphenyl Examples include ethoxysilane, diphenethyldiethoxysilane, triphenethylethoxysilane, ethyltrichlorosilane, diethyldichlorosilane, triethylchlorosilane, phenyltrichlorosilane, diphenyldichlorosilane, vinyltrichlorosilane, ethyltrichlorosilane, diethyldichlorosilane, and triethylchlorosilane. It is done.

(Polycarbonate resin)
The polycarbonate resin which is the main material of the resin composition of the present invention is an interfacial polymerization method in which a bisphenol compound, for example, 2,2-bis (4-hydroxyphenyl) propane (hereinafter referred to as “bisphenol A”) and phosgene are reacted. (Phosgene method) and a known method such as a melt polymerization method (transesterification method) in which bisphenol A and diphenyl carbonate are reacted.

  As a typical process of interfacial polymerization, first, phosgene is first introduced into a mixed solution of a sodium hydroxide aqueous solution of a bisphenol compound and an organic solvent to form a polycarbonate oligomer, and then a basic catalyst is added. A method is used in which a high-molecular-weight polycarbonate resin is produced, the solution after polymerization is washed, the aqueous solution phase is separated, and the polycarbonate resin is recovered from the obtained organic solvent phase.

  On the other hand, as a typical process of the melt polymerization method, usually, a bisphenol compound and diaryl carbonate are mixed while heating to form an oligomer of polycarbonate, and then an aryl alcohol as a by-product by decompression treatment. The method of tilting the equilibrium toward the polymer side by removing the polymer to produce a high molecular weight polycarbonate resin is used.

  As a method for producing a polycarbonate resin in a field where higher physical properties are required, it is generally said that the interfacial polymerization method is more suitable than the melt polymerization method. This is because the interfacial polymerization method makes it easier to obtain a high molecular weight polymer. However, the metal oxide particles of the present invention are inherently polar and compatible with aqueous solutions. Although the compatibility with an aqueous solution can be reduced by the hydrophobization treatment, complete hydrophobization is difficult and leads to an increase in cost. For this reason, when metal oxide particles are added during the interfacial polymerization process, a part of the particles move to the aqueous solution phase, and the amount of the resin composition to be produced is reduced compared to the amount added. Such a decrease in filling efficiency also leads to an increase in cost.

  For the reasons described above, in the present invention, the polycarbonate resin is preferably produced by a melt polymerization method.

(Production method of resin composition)
As described above, in the resin composition of the present invention, since the polycarbonate resin as the main material is preferably produced by a melt polymerization method, a production method using the melt polymerization method will be described below.

  First, a monomer for polycarbonate resin is prepared. Next, the metal oxide particles described above are preferably blended in the monomer. The metal oxide particles can be directly blended in the monomer, but a colloidal solution of the metal oxide particles is prepared in advance, and the colloidal solution and the monomer are mixed to form the metal oxide particles in the monomer. It is preferable to mix the metal oxide particles. In this case, the metal oxide particles can be easily and uniformly dispersed in the monomer.

  The dispersion solvent for preparing the colloidal solution may be selected from those other than those having extremely low compatibility with the polycarbonate resin or its monomer, and is particularly limited as long as these conditions are satisfied. is not. For example, alcohol such as methanol, ethanol, propanol, isopropanol and ethylene glycol, ether such as tetrahydrofuran, 1,4-dioxane, ethylene glycol diethyl ether and diethylene glycol diethyl ether, ketone such as methyl ethyl ketone and methyl isobutyl ketone, halogen such as methylene chloride Examples thereof include aromatic hydrocarbons such as hydrocarbons, toluene and xylene.

  Among these, isopropanol and methyl ethyl ketone are not adversely affecting the polymerization reaction, are not easily volatilized at the initial stage of polymerization, are easily released upon completion of polymerization, have excellent dispersion stability of metal oxide particles, and are easy to handle and replace with a solvent. Is particularly preferred.

  Other methods for dispersing the metal oxide particles in the polycarbonate resin include melt kneading using a kneader and a method in which the resin is dissolved in a solvent and added to the solution. It is difficult to get sex.

  Next, in a state where the metal oxide particles are dispersed in the monomer, the pressure is reduced to a predetermined pressure, and the polymerization reaction is performed by heating and heating, whereby the polycarbonate resin in which the metal oxide particles are uniformly dispersed. Can be obtained.

  The polymerization reaction can be performed in one stage, but can also be performed in multiple stages. In the latter case, the degree of polymerization can be further increased, and the mechanical strength and the like of the obtained resin composition can be further increased.

(Molded body and parts)
The resin composition obtained through the above-described process maintains the hot moldability of the resin alone, and has a curved surface shape through a molding process such as melt extrusion molding, injection molding, blow molding, It can be processed into molded products of various sizes.

  The resin composition achieves improved rigidity without sacrificing transparency and impact strength, has a low coefficient of thermal expansion, and can suppress warping at high temperatures, so these functions For example, a transparent cover of an instrument panel as an automobile interior material, a window glass, a headlamp, a sunroof, a combination lamp cover, etc. It can be said that the material is suitable for transparent members, fixtures, and furniture used in houses.

  Next, although the Example of the manufacturing method of the resin composition which concerns on this invention is explained in full detail, this invention is not limited by this.

Example 1
First, a commercially available water-dispersed colloidal silica produced by a sol-gel method (“Quatron PL-1” manufactured by Fuso Chemical Industry Co., Ltd., average primary particle size 15 nm, Na ₂ O content 1 ppm or less) is used. Then, the solvent was replaced with isopropanol using an ultrafiltration method to obtain colloidal silica (I) dispersed in isopropanol having a solid content (silica) concentration of about 10% by weight. In colloidal silica (I), hydrophobic groups are not introduced to the surface of the silica particles.

  The colloidal silica (I), together with bisphenol A and diphenyl carbonate, was set with a stirring blade and a thermometer installed in an oil bath in such a ratio that the silica concentration in the resin composition after the reaction was 30% by weight. It put into the glass reaction container, and it heated to 80 degreeC slowly, stirring, so that the said colloidal silica and the said monomer might be mixed sufficiently. Subsequently, the oil bath temperature was set to 160 ° C., and isopropyl alcohol as a solvent was gradually distilled off.

  After the solvent was distilled off, preheating was carried out at around 160 ° C. for about 20 minutes to initiate the condensation reaction. Subsequently, the temperature of the reaction system was raised to 230 ° C. over 30 minutes, and the condensation was allowed to proceed at this temperature by stirring at a reduced pressure of 15 mmHg or less for about 150 minutes. Next, the reaction system is further heated at 250 ° C. over 30 minutes, and at this temperature, stirring is performed at a reduced pressure of 10 mmHg for about 30 minutes to reduce unreacted oligomer components, and finally, While maintaining the degree of vacuum, aging was carried out at 290 ° C. for about 15 minutes to obtain the desired resin composition. The obtained resin composition was hot-pressed to obtain a test piece of a transparent resin composition. This is Example 1.

(Example 2)
To the colloidal silica (I) described above, phenyltrimethoxysilane as a modifier was added together with a small amount of a phosphoric acid aqueous solution, and the mixture was reacted at 70 ° C. for 2 hours. Thereafter, the dispersion solvent was replaced with methyl ethyl ketone to obtain colloidal silica (II) having a phenyl group introduced on the silica surface. This colloidal silica (II) was added during the melt polymerization of the polycarbonate resin in the same manner as in Example 1 to obtain a desired resin composition. The obtained resin composition was hot-pressed to obtain a test piece of a transparent resin composition. This is Example 2.

(Example 3)
Phenyltrimethoxysilane as a modifier was added to the above-mentioned colloidal silica (I) together with a small amount of phosphoric acid aqueous solution, and the mixture was stirred at 70 ° C. for 2 hours to be reacted. Thereafter, the dispersion solvent was replaced with toluene to obtain colloidal silica (III) having a phenyl group introduced on the silica surface. The colloidal silica (III) is mixed with bisphenol A, sodium hydroxide aqueous solution and methylene chloride so that the silica concentration in the resin composition after the reaction becomes 30% by weight, a stirring blade, a reflux condenser, a thermometer, a gas introduction pipe Into a glass reaction vessel equipped with a pH electrode and a dropping funnel, the temperature was kept at 25 ° C., and phosgene was slowly blown in while stirring vigorously until the pH of the reaction solution dropped to about 7.

  Next, an aqueous sodium hydroxide solution was added to the reaction solution, benzyltriethylammonium chloride was further added, the reaction temperature was raised to 30 ° C., and the mixture was vigorously stirred for about 1 hour. Thereafter, the organic solvent phase is separated from the aqueous solution phase, the organic solvent phase is washed with water, and further stirred well with the aqueous hydrochloric acid solution. After confirming that the pH of the mixed solution was neutral to weakly acidic, it was washed again with water to separate the organic solvent phase. When the organic solvent phase thus obtained was put into isopropanol which was vigorously stirred, a powdery substance was deposited. This was filtered, sufficiently washed with isopropanol, and then dried using a vacuum dryer to obtain a desired resin composition. Subsequently, the obtained resin composition was hot-pressed to obtain a test piece of a transparent resin composition. This is Example 3.

(Comparative example)
Commercially available isopropanol-dispersed colloidal silica produced from water glass (“Snowtex IPA-ST” manufactured by Nissan Chemical Industries, average primary particle size 15 nm, Na ₂ O content of about 400 ppm) Similarly, a resin composition was obtained at the time of melt polymerization of the polycarbonate resin. The obtained resin composition was hot-pressed to obtain a test piece of a transparent resin composition. This is referred to as Comparative Example 1.

(Evaluation)
Then, the following physical property evaluation was performed about the test piece of each said resin composition. The evaluation results are summarized in Table 1. Table 1 also shows values of general unfilled polycarbonate resin as reference values.
Filler concentration in the resin composition: The resin composition was calcined in a platinum crucible in the air at 600 ° C. for 2 hours to obtain the ash content = silica blending amount, and the ratio to the initial resin composition weight was bent. Elastic modulus: The test method conforms to ASTM D790-1991.
Linear expansion coefficient: The test method conforms to ASTM D696-1991.
Haze value (thickness 1 mm): The test method conforms to JIS K7105-1981.
Coloring: The presence or absence of coloring was confirmed visually.

  Although the resin compositions obtained in Examples 1 to 3 are slightly inferior in transparency to the unfilled polycarbonate resin, they still have good values and are practically free from problems. Further, the flexural modulus and the linear expansion coefficient are greatly improved, and the object of the present invention is achieved.

  On the other hand, the comparative example is an element in which strong coloring of red is recognized as compared with Examples 1 and 2, and the use is greatly limited. Further, although the filler concentration is almost the same as in Examples 1 and 2, the transparency is lowered because the dispersibility of the nano-order particles is expected to be slightly insufficient, and the coloring is sodium. It is the influence of ions. The flexural modulus and the linear expansion coefficient are improved as compared with the polycarbonate resin not filled with the filler, but inferior to those of Examples 1 and 2. The cause of this is thought to be due to the dispersibility effect described above, but it is expected that the molecular weight is lowered due to the presence of sodium ions.

  As described above, the present invention has been described in detail based on the embodiments of the present invention with specific examples. However, the present invention is not limited to the above contents, and all modifications and changes are made without departing from the scope of the present invention. It can be changed.

  For example, the resin composition of the present invention contains an antioxidant and a heat stabilizer (including hindered phenols, hydroquinones, thioethers, phosphites, and their substitution products and combinations thereof), ultraviolet absorption, if necessary. Agents (eg resorcinol, salicylate, benzotriazole, benzophenone, etc.), lubricants, mold release agents (eg silicone resin, montanic acid and salts thereof, stearic acid and salts thereof, stearyl alcohol, stearylamide, etc.), dyes (eg nitrocin etc.) , Coloring agents containing facials (for example, cadmium sulfide, phthalocyanine, etc.), additive additives (for example, silicon oil), crystal nucleating agents (for example, talc, kaolin, etc.), etc. can be added alone or in appropriate combination. .

  The resin composition of the present invention can be molded into a desired shape and applied to any application. In particular, organic glass that can be applied to various products in place of conventional inorganic glass can be suitably used for automotive parts, electrical equipment parts, residential building materials, and the like.

Claims (15)

Polycarbonate resin,
Metal oxide particles dispersed in the polycarbonate resin, the content of sodium ions being 10 ppm or less in terms of oxides;
A resin composition comprising:   The resin composition according to claim 1, wherein the metal oxide particles are formed through condensation polymerization of a metal alkoxide.   The resin composition according to claim 2, wherein the metal alkoxide is at least one of tetramethoxysilane and tetraethoxysilane.   The resin composition according to claim 2, wherein the metal alkoxide is at least one selected from triethoxyaluminum, tripropoxyaluminum, and triisopropoxyaluminum.   The resin composition according to claim 2, wherein the metal alkoxide is at least one selected from tetraethoxytitanium, tetrapropoxytitanium, and tetraisopropoxytitanium.   6. The resin composition according to claim 1, wherein the major axis of the metal oxide particles is 380 nm or less, which is a lower limit value of a visible light wavelength region.   The resin composition according to any one of claims 1 to 6, wherein a length of at least one side of the metal oxide particles is 1 to 100 nm.   The resin composition according to claim 1, wherein the metal oxide particle has a hydrophobic group on a surface thereof.   The resin composition according to claim 8, wherein the hydrophobic group is at least one of an aromatic hydrocarbon group and an aliphatic hydrocarbon group.   The resin composition according to claim 1, wherein the metal oxide particles are silica.   The resin composition according to claim 1, wherein the content of the metal oxide particles is 1 to 60% by weight. It is a manufacturing method of the resin composition as described in any one of Claims 1-11,
A method for producing a resin composition, comprising the step of performing a polymerization treatment after adding the metal oxide particles to a monomer of the polycarbonate resin.   A colloidal solution is formed by dispersing the metal oxide particles in a predetermined solvent, and the monomer and the colloidal solution are mixed to uniformly disperse the metal oxide particles in the monomer. The manufacturing method of the resin composition of Claim 12.   The method for producing a resin composition according to claim 13, wherein the polymerization treatment is a melt polymerization method.   The resin composition according to any one of claims 12 to 14, wherein the metal oxide particles are subjected to a hydrophobic treatment to form a hydrophobic group on a surface of the metal oxide particles. Method.