JP6875952B2 - Polycarbonate resin composition and resin molded products containing it - Google Patents

Description

The present invention has transparency, is excellent in weather resistance and chemical resistance, and can prevent deterioration of color tone due to heating during thermal processing, so that polycarbonate is suitably used as a housing material used in electrical and electronic equipment. Regarding the resin composition.

Polycarbonate resin is a thermoplastic resin having transparency, excellent mechanical strength, and excellent heat resistance, and is therefore widely used industrially in housings for electric devices and electronic devices. In recent years, mobile terminals such as smartphones are required to have a strong product housing because they carry their products with them. In addition, a product cover is used for the purpose of protecting the display portion of the product.

Since the conventional polycarbonate resin has insufficient weather resistance and chemical resistance, there are problems that problems such as color tone defects due to exposure to light and damage to the product due to contact with chemicals are likely to occur.

Further, many methods of adding a polyester resin in order to improve the chemical resistance of the polycarbonate resin have been reported from the past. Further, several methods for improving the thermal stability of the polycarbonate resin composition containing the polyester resin have been reported.

For example, Patent Document 1 describes by adding alkylhydrogenphosphite or arylhydrogenphosphite to 100 parts by weight of a mixed resin of a polyester resin and a polycarbonate resin obtained by polycondensing a dicarboxylic acid component and a glycol component. We are trying to improve the coloring of the mixed resin during thermal processing. However, the yellowness of the molded product obtained by heat processing of this resin composition (hereinafter, may be abbreviated as YI) is large, and the yellowing degree after exposure to light or after repeated heat processing is large. There was room for improvement in these yellowness and yellowing.

Japanese Unexamined Patent Publication No. 2004-175823

Conventionally, a polycarbonate resin composition containing a polyester resin having excellent permeability, thermal stability, chemical resistance, and weather resistance as described above has not been obtained.

An object of the present invention is to provide a polycarbonate resin composition having excellent thermal stability, chemical resistance and weather resistance during heat processing without impairing the original characteristics of the polycarbonate resin such as transparency.

As a result of diligent research in view of such a problem, the present inventors have made a specific antioxidant in a polycarbonate resin containing a polyester resin obtained by polycondensing a dicarboxylic acid-based polycondensation component and a glycol-based polycondensation component. By blending an agent and a specific ultraviolet absorber, a polycarbonate resin composition having excellent thermal stability, chemical resistance, and weather resistance during thermal processing without impairing various excellent performances of the polycarbonate resin. The present invention has been completed.

That is, the present invention is mainly composed of 60 to 80% by weight of the polycarbonate resin (A) and 20 to 40% by weight of the polyester resin (B) obtained by polycondensing the dicarboxylic acid-based polycondensation component and the glycol-based polycondensation component. A polycarbonate resin composition containing 0.02 to 1 part by weight of a phosphorus-based antioxidant (C) and 0.05 to 2 parts by weight of an ultraviolet absorber (D) with respect to 100 parts by weight of the component. , And a resin molded body such as a housing of an electric / electronic device including the same.

An injection molding or extrusion molding method is used as a method for molding a housing or the like of an electric / electronic device containing the polycarbonate resin composition of the present invention. In injection molding, the polycarbonate resin composition of the present invention that has been heated and melted in the cylinder of an injection molding machine is injected and cooled and solidified in a mold that can obtain the desired shape of an electric / electronic housing or cover to obtain a product. You can. Injection molding is widely used because it can be mass-produced even with complicated shapes. Further, in extrusion molding, the polycarbonate resin composition of the present invention is melt-fluidized in a heating cylinder of an extruder, continuously advanced by a screw, and continuously extruded through a die by the rotation and internal pressure of the screw to obtain a sheet. Can be obtained. The resulting sheet generally has a thickness of 0.15-2 mm. The obtained sheet is used as a cover for an electric / electronic device. Further, if necessary, other resin components such as hard coat and acrylic resin can be coated, and these sheets can be used for shaping.

The present invention is excellent in thermal stability, chemical resistance and weather resistance during thermal processing without impairing the original characteristics (transparency, heat resistance, etc.) of the polycarbonate resin, and therefore can be used outdoors. It can be suitably used as a resin composition for a device housing or a cover.

Hereinafter, embodiments will be described in detail. However, more detailed explanation than necessary may be omitted. For example, a detailed explanation of what is already well known or a duplicate explanation for substantially the same configuration may be omitted. This is to avoid unnecessary redundancy of the following description and to facilitate the understanding of those skilled in the art.

It should be noted that the inventors provide the following description in order for those skilled in the art to fully understand the present invention, and are not intended to limit the subject matter described in the claims by these.

Applications of the resin molded product obtained by injection molding the polycarbonate resin composition of the present invention include, for example, a housing for electrical and electronic equipment, and also includes a housing, a casing, a product protective cover, an internal chassis, and the like. It shall mean the use. In particular, a thin housing, a housing, or the like of a portable electronic device can be mentioned as a preferable example. More specifically, there are notebook personal computers, mobile information terminals such as smartphones, thin-walled housings such as video cameras, digital cameras, and smart meters, housings, casings, and alternatives to metal products used for internal chassis.

The polycarbonate resin (A) used in the present invention is obtained by a phosgene method in which various dihydroxydiaryl compounds are reacted with phosgene, or an ester exchange method in which a dihydroxydiaryl compound is reacted with a carbonic acid ester such as diphenyl carbonate. It is a polymer, and a typical one is a polycarbonate resin produced from 2,2-bis (4-hydroxyphenyl) propane (commonly known as bisphenol A).

Examples of the dihydroxydiaryl compound include bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxyphenyl) butane, and 2, in addition to bisphenol A. 2-Bis (4-hydroxyphenyl) octane, bis (4-hydroxyphenyl) phenylmethane, 2,2-bis (4-hydroxyphenyl-3-methylphenyl) propane, 1,1-bis (4-hydroxy-3) − Tertiary butylphenyl) propane, 2,2-bis (4-hydroxy-3-bromophenyl) propane, 2,2-bis (4-hydroxy-3,5-dibromophenyl) propane, 2,2-bis (4) Bis (hydroxyaryl) alkanes such as 4-hydroxy-3,5-dichlorophenyl) propane, 1,1-bis (4-hydroxyphenyl) cyclopentane, such as 1,1-bis (4-hydroxyphenyl) cyclohexane. Bis (hydroxyaryl) cycloalkans, dihydroxydiaryl ethers such as 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3,3'-dimethyldiphenyl ether, such as 4,4'-dihydroxydiphenylsulfide. Dihydroxydiarylsulfides, dihydroxydiarylsulfides such as 4,4'-dihydroxydiphenylsulfoxide, 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfoxide, 4,4'-dihydroxydiphenylsulfone, 4,4 Examples thereof include dihydroxydiarylsulfones such as ′ -dihydroxy-3,3′-dimethyldiphenylsulfone. These are used alone or in combination of two or more, but in addition to these, piperazine, dipiperidyl hydroquinone, resorcin, 4,4'-dihydroxydiphenyl and the like may be mixed and used.

Further, the above dihydroxyaryl compound and a phenol compound having a valence of 3 or more as shown below may be mixed and used. Examples of trivalent or higher phenols include fluoroglucolcin, 4,6-dimethyl-2,4,6-tri- (4-hydroxyphenyl) -heptene, and 2,4,6-dimethyl-2,4,6-tri- (4). -Hydroxyphenyl) -heptane, 1,3,5-tri- (4-hydroxyphenyl) -benzol, 1,1,1-tri- (4-hydroxyphenyl) -ethane and 2,2-bis- [4, 4- (4,4'-dihydroxydiphenyl) -cyclohexyl] -propane and the like can be mentioned.

The viscosity average molecular weight of the polycarbonate resin (A) is not particularly limited, but is usually in the range of 1000 to 100,000, more preferably 15,000 to 30,000, and even more preferably 19000 to 29000 in terms of moldability and strength. Further, in producing such a polycarbonate resin, a molecular weight modifier, a catalyst and the like can be used as needed.

The polyester resin (B) obtained by polycondensing a dicarboxylic acid-based polycondensation component and a glycol-based polycondensation component used in the present invention is, for example, one selected from the group consisting of terephthalic acid and terephthalic acid derivatives. Alternatively, a polyester resin obtained by polycondensing two or more types of terephthalic acid-based polycondensation components and a glycol-based polycondensation component containing 1,4-cyclohexanedimethanol in an amount of 40 mol% or more can be mentioned. Since 1,4-cyclohexanedimethanol is contained in an amount of 40 mol% or more as a glucol-based polycondensation component, excellent transparency can be obtained by making the refractive index of the polyester resin close to the refractive index of the polycarbonate resin.

The content of the polyester resin (B) obtained by polycondensing the dicarboxylic acid-based polycondensation component and the glycol-based polycondensation component used in the present invention is 20 with respect to 60 to 80 parts by weight of the polycarbonate resin (A). It is ~ 40 parts by weight, preferably 25 to 40 parts by weight, and more preferably 25 to 35 parts by weight. If the content of the polyester resin (B) obtained by polycondensing the dicarboxylic acid-based polycondensation component and the glycol-based polycondensation component is less than 20 parts by weight, the chemical resistance is inferior, and if it is more than 40 parts by weight, the heat resistance is high. In the summer, problems such as deformation of the housing of the electric / electronic device made of the polycarbonate resin composition of the present invention due to heat are likely to occur in the vehicle. For example, as a commercially available product, SKY GREEN JN200 manufactured by SK Chemical Co., Ltd. is commercially available.

In the resin composition of the present invention, a phosphorus-based antioxidant (C) is used, and the blending amount thereof is 60 to 80 parts by weight of the polycarbonate resin (A), a dicarboxylic acid-based polycondensation component and a glycol-based polycondensation component. It is 0.02 to 1 part by weight per 20 to 40 parts by weight of the polyester resin (B) obtained by polycondensation. If the blending amount is less than 0.02 parts by weight, the thermal stability is inferior, which is not preferable. Further, if it exceeds 1 part by weight, the thermal stability becomes insufficient at the time of staying during the molding process, and it is not preferable because it turns yellow. More preferably, it is 0.05 to 0.3 parts by weight.

Examples of the phosphorus-based antioxidant used in the present invention include compounds represented by the following general formula 1.
General formula 1

（一般式１中、Ｒ１及びＲ２は、それぞれ独立して、炭素数１〜２０のアルキル基又はアルキル基で置換されていてもよいアリール基を示し、ａ及びｂは、それぞれ独立して、０〜３の整数を示す。）

(In the general formula 1, R1 and R2 each independently represent an alkyl group having 1 to 20 carbon atoms or an aryl group which may be substituted with an alkyl group, and a and b are independently 0. Indicates an integer of ~ 3.)

As the compound represented by the general formula 1, for example, ADEKA's ADEKA STAB PEP-24, PEP-36, PEP-45 (“ADEKA STAB” is a registered trademark) and Doverphos S-9228 manufactured by Dover Chemical are commercially available. It is available at.

Examples of the ultraviolet absorber (D) used in the present invention include ultraviolet absorbers selected from the group consisting of benzotriazole-based compounds, triazine-based compounds, and benzophenone-based compounds, and these are used alone or in combination of two. The above can be used in combination. Of these, benzotriazole-based compounds can be preferably used.

Examples of the benzotriazole-based compound include 2- (2-hydroxy-5-methylphenyl) -2H-benzotriazole and 2- (3-tert-butyl-2-hydroxy-5-methylphenyl) -5-chloro-2H-benzotriazole, 2. -(3,5-di-tert-pentyl-2-hydroxyphenyl) -2H-benzotriazole, 2- (2H-benzotriazole-2-yl) -4-methyl-6- (3,4,5,6-tellahydrophilthylmylyl) phenol, 2- (2-hydroxy-4-octyloxyphenyl) -2H-benzotriazole, 2- (2-hydroxy-5-tert-octylphenyl) -2H-benzotriazole, 2- [2'-hydroxy-3,5-di 1,1-dimethylbenzyl) phenyl] -2H-benzotriazole, 2,2'-methylenbis [6- (2H-benzotriazole-2-yl) 4- (1,1,3,3-tetramethylbutyl) phenol] and the like. .. Of these, 2,2'-Methylenbis [6- (2H-benzotriazole-2-yl) 4- (1,1,3,3-tetramethylbutyl) phenol] is preferable because it has good transpiration during thermoforming. Used for.

Examples of triazine compounds include 2- [4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine-2-yl] -5- (octyloxy) phenol and 2- (4,6). -Diphenyl-1,3,5-triazine-2-yl) -5-[(hexyl) oxy] phenol and the like can be mentioned.

Examples of the benzophenone compound include 2,4-dihydroxybenzophenone and 2-hydroxy-4-n-octoxybenzophenone.

The blending amount of the ultraviolet absorber (D) is 60 to 80% by weight of the polycarbonate resin (A) and 20 to 40 of the polyester resin (B) obtained by polycondensing a dicarboxylic acid-based polycondensation component and a glycol-based polycondensation component. It is 0.05 to 2 parts by weight per% by weight. If the blending amount is less than 0.05 parts by weight, the weather resistance is inferior, which is not preferable. If it exceeds 2 parts by weight, it is not preferable because it is inferior in thermal stability such as contaminating the mold due to a large amount of gas generated during molding. The preferred blending amount is 0.15 to 1 part by weight, more preferably 0.15 to 0.4 parts by weight.

The compounding method of the various compounding components (A), (B), (C), and (D) of the present invention is not particularly limited, and these are mixed by an arbitrary mixer, for example, a tumbler, a ribbon blender, a high-speed mixer, or the like. However, it can be easily melt-kneaded with a normal single-screw or twin-screw extruder or the like. Further, there is no particular limitation on the order of blending these.

In addition, when mixed, other known additives such as mold release agent, ultraviolet absorber, filler, antistatic agent, antioxidant, phosphorus-based heat stabilizer, dyeing pigment, spreading agent (epoxy) are required. Soybean oil, liquid paraffin, etc.) can be blended.

Examples of the filler include glass fibers, glass beads, glass flakes, carbon fibers, talc powder, clay powder, mica, potassium titanate whiskers, aluminum borate whiskers, wallastnite powder, silica powder and the like. Examples of mica include muscovite, biotite, phlogopite, and artificial phlogopite.

As described above, embodiments have been described as an example of the techniques disclosed in this application. However, the technique of the present invention is not limited to this, and can be applied to embodiments in which changes, replacements, additions, omissions, etc. are made as appropriate.

Hereinafter, the present invention will be specifically described with reference to Examples, but the present invention is not limited to these Examples. Unless otherwise specified, "parts" and "%" are based on weight.

The following materials were used as raw materials.
1. 1. Polycarbonate resin (A):
Polycarbonate resin synthesized from bisphenol A and carbonyl chloride (SD Polycarbonate 200-3 manufactured by Sumika Polycarbonate Limited, viscosity average molecular weight: 28300 (hereinafter abbreviated as "PC"))

2. Polyester resin (B) obtained by polycondensing a dicarboxylic acid-based polycondensation component and a glycol-based polycondensation component: A glycol-based resin containing 40 mol% or more of a terephthalic acid-based polycondensation component and 1,4-cyclohexanedimethanol. Polyester resin obtained by polycondensation with a polycondensation component: Polycyclohexylene methylene terephthalate-glycol copolyester (SKY GREEN JN200 manufactured by SK Chemical Co., Ltd. (hereinafter abbreviated as "PCTG"))

3. 3. Antioxidant (C):
3-1. 3,9-bis (2,6-di-tert-butyl-4-methylphenoxy) -2,4,8,10-tetraoxa-3,9-diphosphaspiro [5,5] represented by the following formula. Undeca

アデカスタブＰＥＰ−３６（商品名、ＡＤＥＫＡ社製、以下「Ｃ１」と略記）

ADEKA STAB PEP-36 (Product name, manufactured by ADEKA, hereinafter abbreviated as "C1")

3-2. Phenolic Antioxidant Octadecil-3- (3,5-di-tert-butyl-4-hydroxyphenyl) Propionate (Adeka Corporation Adeka Stub AO-50 (hereinafter abbreviated as "AO2")

4. UV absorber (D): Benzotriazole-based UV absorber 2,2'-Methylenbis [6- (2H-benzotriazol-2-yl) 4- (1,1,3,3-tetramethylbutyl) phenol]
(BASF TINUVIN 329 (hereinafter abbreviated as "UVA"))

The above-mentioned various raw materials are collectively put into a tumbler at the blending ratios shown in Tables 1 and 2, dried and mixed for 10 minutes, and then melted at a melting temperature of 290 ° C. using a twin-screw extruder (TEM-37SS manufactured by Toshiba Machine Co., Ltd.). The mixture was kneaded in 1 to obtain pellets of a polycarbonate resin composition. From the obtained pellets, various test pieces were processed using an injection molding machine (J100E2P manufactured by Japan Steel Works), and various data were collected by the following method. The evaluation results are shown in Tables 1 and 2.

(Total light transparency of molded products, evaluation of haze)
After drying the obtained various pellets under the condition of 120 ° C. × 4 hours, a test piece for weather resistance evaluation (length 80 mm) was used at a cylinder set temperature of 290 ° C. using an injection molding machine (J100E2P manufactured by Japan Steel Works). , Width 50 mm, thickness 2 mm). Using the obtained test piece, the total light transmittance and haze of the test piece having a thickness of 2 mm were measured by HR-100 manufactured by Murakami Color Research Institute Co., Ltd. according to JIS K7136.

(Evaluation of YI of molded products)
After drying the obtained various pellets under the condition of 120 ° C. × 4 hours, a test piece for yellowness evaluation (length 80 mm) was used at a cylinder set temperature of 290 ° C. using an injection molding machine (J100E2P manufactured by Japan Steel Works). , Width 50 mm, thickness 2 mm). Using the obtained test piece, YI having a test piece thickness of 2 mm was measured by CMS-35SP manufactured by Murakami Color Research Institute Co., Ltd. according to JIS7361. The smaller the YI, the less the molded product is colored and the better the appearance can be obtained. As the criteria for evaluating YI, those with a YI value of less than 2 were regarded as good (◯), and those with a YI value of 2 or more were regarded as poor (x).

(2) Thermal stability The obtained pellets were repeatedly kneaded three times at a melting temperature of 290 ° C. using a twin-screw extruder (TEM-37SS manufactured by Toshiba Machine Co., Ltd.). Pellets that have been kneaded three times repeatedly are dried under the condition of 120 ° C. for 4 hours, and then a flat plate test is performed under the condition of a cylinder set temperature of 290 ° C. using an injection molding machine (J100E2P manufactured by Japan Steel Works). Pieces (length 80 mm, width 50 mm, thickness 2 mm) were prepared. Using the obtained test piece, the change in YI (ΔYI) was measured by CMS-35SP manufactured by Murakami Color Research Institute Co., Ltd. according to JIS7361. ΔYI represents the difference in the degree of yellowness before and after re-kneading, and the smaller ΔYI, the smaller the discoloration and the better the thermal stability. As the criteria for evaluation of ΔYI, those having a value of ΔYI less than 2 were regarded as good (◯), and those having a value of ΔYI of 2 or more were regarded as poor (x).

(3) Weather resistance After drying the obtained pellets under the condition of 120 ° C for 4 hours, weather resistance is evaluated at a cylinder set temperature of 290 ° C using an injection molding machine (J100E2P manufactured by Japan Steel Works). A test piece (length 80 mm, width 50 mm, thickness 2 mm) was prepared. The obtained test piece was mounted on a xenon weather meter (Super xenon weather meter SX75 manufactured by Suga Test Instruments Co., Ltd.), and an ^{irradiation test was conducted for 100 hours at a setting of irradiance of 50 W / m 2} , humidity of 50% RH, and black panel temperature of 50 ° C. The change in YI (ΔYI) was measured by CMS-35SP manufactured by Murakami Color Research Institute. ΔYI represents the difference in the degree of yellowness before and after the irradiation test, and the smaller ΔYI, the smaller the discoloration and the better the weather resistance. As the criteria for evaluation of ΔYI, those having a value of ΔYI less than 2 were regarded as good (◯), and those having a value of ΔYI of 2 or more were regarded as poor (x).

(Evaluation of chemical resistance of molded products)
After each of the pellets of the various resin compositions obtained above was dried at 120 ° C. for 4 hours, a test piece (length 127 mm) was used at a set temperature of 290 ° C. using an injection molding machine (J-100E-C5 manufactured by Japan Steel Works). , Width 13 mm, thickness 3.2 mm). The obtained test piece was subjected to arbitrary strain using a cantilever beam chemical resistance / solvent resistance test jig (see the formula below), and the following chemicals were applied to the central portion of the test piece.
Evaluation Chemicals Kao Corporation's Strong Residential Detergent Magiclin After applying the above chemicals, leave the test piece in an atmosphere of 23 ° C for 48 hours, and determine the critical strain (%) from the position of cracks and cracks on the test piece by the following formula. I asked.

(formula)

From the critical strain obtained by the above formula, the chemical resistance was judged according to the following criteria, and the critical strain of 0.7% or more "(◯) was accepted.
Judgment of chemical resistance and solvent resistance:
◯: Critical strain is 0.7% or more Δ: Critical strain is 0.5% or more to less than 0.7% ×: Critical strain is less than 0.5%

(Evaluation of notched Charpy impact strength and deflection temperature under load)
After each of the pellets of the various resin compositions obtained above is dried at 120 ° C. for 4 hours, an injection molding machine (J-100E-C5 manufactured by Japan Steel Works) is used at a set temperature of 290 ° C. according to the ISO test method. A test piece was prepared, and the obtained test piece was used to measure the notched Charpy impact strength and deflection temperature under load according to ISO 179-2 and ISO 75-2, and the notched Charpy impact strength was 7 KJ / m ^2. The above and the deflection temperature under load of 95 ° C. or higher (“◯” in the table) were regarded as acceptable.

As shown in Table 1, when the polycarbonate resin composition satisfied all the constituent requirements of the present invention (Examples 1 to 3), good results were shown in all the evaluation items.

On the other hand, as shown in Table 2, when the polycarbonate resin composition does not satisfy the constituent requirements of the present invention, there are some drawbacks in each case.
In Comparative Example 1, when the blending amount of PC was larger than the specified amount, the chemical resistance was inferior.
In Comparative Example 2, the amount of UVA compounded was less than the specified amount, and the weather resistance was inferior.
In Comparative Example 3, when AO was a phenolic antioxidant, it was inferior in yellowing degree and thermal stability.
In Comparative Example 4, when the blending amount of AO was less than the specified amount, the degree of yellowing and the thermal stability were inferior.
Comparative Example 5 shows a case where the blending amount of PCTG is larger than the specified amount, and the notched Charpy strength,
And was inferior in heat resistance.

As described above, an embodiment has been described as an example of the technique in the present invention.
To that end, a detailed explanation was provided.

Therefore, among the components described in the detailed description, not only the components essential for solving the problem but also the components not essential for solving the problem are included in order to exemplify the above technology. obtain. Therefore, the fact that those non-essential components are described in the detailed description should not immediately determine that those non-essential components are essential.

Further, since the above-described embodiment is for exemplifying the technique of the present invention, various changes, replacements, additions, omissions, etc. can be made within the scope of claims or the equivalent scope thereof.

The present invention is excellent in thermal stability, chemical resistance and weather resistance during thermal processing without impairing the original characteristics (transparency, heat resistance, etc.) of the polycarbonate resin, and therefore can be used outdoors. It can be suitably used as a resin composition for equipment housings and covers, and has extremely high industrial utility value.

Claims (5)

100 parts by weight of the main resin component composed of 60 to 80% by weight of the polycarbonate resin (A) and 20 to 40% by weight of the polyester resin (B) obtained by polycondensing the dicarboxylic acid-based polycondensation component and the glycol-based polycondensation component. On the other hand, the transparent polycarbonate resin composition is characterized by containing 0.02 to 1 part by weight of a phosphorus-based antioxidant (C) and 0.05 to 2 parts by weight of an ultraviolet absorber (D) .
A transparent polycarbonate resin composition in which the ultraviolet absorber (D) is one or more selected from the group consisting of benzotriazole-based compounds and triazine-based compounds . The polyester resin (B) is a glycol containing 40 mol% or more of one or more terephthalic acid-based polycondensation components selected from the group consisting of terephthalic acid and terephthalic acid derivatives and 1,4-cyclohexanedimethanol. The transparent polycarbonate resin composition according to claim 1, which is a polyester resin obtained by polycondensing a system polycondensation component. The transparent polycarbonate resin composition according to claim 1, wherein the phosphorus-based antioxidant (C) is a compound represented by the following general formula 1.
General formula 1:

(In the general formula 1, R ¹ and R ² each independently represent an alkyl group having 1 to 20 carbon atoms or an aryl group which may be substituted with an alkyl group, and a and b are independent of each other. , Indicates an integer from 0 to 3.)
Resin composition. A resin molded product containing the transparent polycarbonate resin composition according to any one of claims 1 to 3. The resin molded product according to claim 4 , wherein the resin molded product is a housing or a product protective cover used for an electric / electronic device.