JP2019172791A - Automotive interior/exterior member - Google Patents

Abstract

To provide an automotive interior/exterior member that has an excellent heat resistance, impact resistance, light resistance and scratch resistance.SOLUTION: The automotive interior/exterior member comprising a polycarbonate resin composition having a predetermined amount of each of a particular polycarbonate resin, a butyl acrylate-methyl methacrylate-styrene-based rubber, a dibutyl hydroxytoluene, a diphenyl dimethicone having a kinematic viscosity at 23°C of 4000 to 5500 cSt, a hindered amine-based light stabilizer having a melting point of 125°C to 130°C, a benzotriazole light stabilizer having a melting point of 102°C to 106°C, a tris(2,4-di-t-butylphenyl)phosphite, and a hindered phenolic antioxidant having a molecular weight of 1100 to 1200, is used.SELECTED DRAWING: None

Description

  The present invention relates to a specific polycarbonate resin, butyl acrylate-methyl methacrylate-styrene rubber, dibutyl hydroxytoluene, diphenyl dimethicone having a kinematic viscosity at 23 ° C. of 4000 to 5500 cSt, and a hindered amine system having a melting point of 125 ° C. to 130 ° C. A light-resistant stabilizer, a benzotriazole-based light-resistant stabilizer having a melting point of 102 ° C. to 106 ° C., tris (2,4-di-t-butylphenyl) phosphite, and a hindered phenol-based antioxidant having a molecular weight of 1100 to 1200 The present invention relates to an automotive interior / exterior member comprising a thermoplastic resin composition.

  Conventionally, aromatic polycarbonate resins have been widely used as engineering plastics having excellent heat resistance, impact resistance, and transparency in various applications such as automobiles and OA equipment fields. On the other hand, aromatic polycarbonate resins are generally manufactured using raw materials derived from petroleum resources. However, given the recent situation where petroleum resources are depleted, they can be obtained from biomass resources such as plants. There is a need to provide plastic molded products using raw materials. In addition, it is feared that global warming due to the increase and accumulation of carbon dioxide emissions will lead to climate change, etc., so that carbon-neutral plant-derived monomers are used as raw materials even after disposal after use. Development of plastic molded products from such plastics is demanded, especially in the field of large molded products.

On the other hand, various polycarbonate resins using plant-derived monomers as raw materials have been developed.
For example, it has been proposed to obtain a polycarbonate resin by transesterification with diphenyl carbonate using isosorbide as a plant-derived monomer (see, for example, Patent Document 1). In addition, a polycarbonate resin obtained by copolymerizing isosorbide and bisphenol A has been proposed as a copolymerized polycarbonate of isosorbide and other dihydroxy compounds (see, for example, Patent Document 2), and further, isosorbide and aliphatic diol are copolymerized. Thus, attempts have been made to improve the rigidity of homopolycarbonate resins made of isosorbide (see, for example, Patent Document 3).

  Furthermore, by mixing two or more kinds of polycarbonate resins having different composition ratios among the polycarbonate resins copolymerized with isosorbide and dihydroxy compounds, it has high fluidity and heat resistance. It is known that a molded product having a small molded appearance defect such as the above and having a good impact resistance can be obtained (see Patent Document 4).

  Further, it is described that a molded article having excellent transparency, light resistance, and hue can be obtained from a polycarbonate resin composition containing a hindered amine light stabilizer in a polycarbonate resin using isosorbide (see Patent Document 5). ).

British Patent No. 1079686 JP-A-56-55425 International Publication No. 04/111106 Pamphlet JP 2014-208800 A International Publication No. 2011/118768 Pamphlet

  However, for automobile interior and exterior members, in addition to heat resistance, impact resistance and light resistance, further improvement in scratch resistance has been required. Therefore, the molded products described in Patent Documents 4 and 5 are also required to have excellent heat resistance, impact resistance, light resistance and improved scratch resistance when used as an interior / exterior member for automobiles. It was.

  That is, an object of the present invention is to solve the above-mentioned conventional problems and provide an automobile interior / exterior member having excellent heat resistance, impact resistance, light resistance and scratch resistance.

  As a result of investigations by the present inventors, a specific polycarbonate resin, butyl acrylate-methyl methacrylate-styrene rubber, dibutylhydroxytoluene, diphenyl dimethicone having a kinematic viscosity at 23 ° C. of 4000 to 5500 cSt, and a melting point of 125 ° C. A hindered amine light stabilizer having a melting point of 102 ° C. to 106 ° C., a tris (2,4-di-t-butylphenyl) phosphite and a hindered molecular weight of 1100 to 1200 The present inventors have found that a polycarbonate resin composition containing a phenolic antioxidant can solve the above-mentioned problems, and completed the present invention.

That is, the gist of the present invention is as follows.
[1] An automotive interior / exterior member comprising a polycarbonate resin composition having a polycarbonate resin and a butyl acrylate-methyl methacrylate-styrene rubber, and a structural unit derived from a dihydroxy compound represented by the following general formula (1) It is a molten mixture of a plurality of carbonate copolymers composed of (constituent unit (1)) and a constituent unit derived from cyclohexanedimethanol (CHDM unit) and having different copolymerization ratios, and the constituent unit in the polycarbonate resin composition ( 1) The content ratio of the molar ratio of CHDM units is 67/33 to 69/31 (molar ratio). In the polycarbonate resin composition, polycarbonate resin and butyl acrylate-methyl methacrylate-styrene rubber For a total of 100 parts by weight, butyl acrylate-methyl methacrylate- It contains 4.0 to 6.0 parts by weight of a len-based rubber, and each of the following components (A) to (F) is a total of 100 weights of the above polycarbonate resin and butyl acrylate-methyl methacrylate-styrene rubber. The interior / exterior member for automobiles containing the following content relative to the part.
Component (A): dibutylhydroxytoluene: 0.001 to 0.015 parts by weight.
Component (B): Diphenyl dimethicone having a kinematic viscosity at 23 ° C. of 4000 to 5500 cSt: 0.05 to 0.31 parts by weight.
Component (C): hindered amine light stabilizer having a melting point of 125 ° C. to 130 ° C .: 0.05 to 0.21 parts by weight.
Component (D): Benzotriazole light stabilizer having a melting point of 102 ° C. to 106 ° C .: 0.05 to 0.31 part by weight.
Component (E): Tris (2,4-di-t-butylphenyl) phosphite: 0.049 to 0.051 part by weight.
Component (F): hindered phenol antioxidant having a molecular weight of 1100 to 1200: 0.09 to 0.11 parts by weight.

[2] The automotive interior / exterior member according to [1], including diphenyldimethicone having a refractive index of the component (B) of 1.49 to 1.51.
[3] The automotive interior / exterior member according to [1] or [2], wherein the component (C) is a hindered amine light-resistant stabilizer having a plurality of piperidine structures.
[4] The automotive interior / exterior member according to [3], wherein the plurality of piperidine structures of the hindered amine light stabilizer of component (C) are linked to one alkane chain by an ester bond.

  According to the present invention, since a specific thermoplastic resin composition is used, it is possible to provide an automotive interior / exterior member having excellent heat resistance, impact resistance, light resistance, and scratch resistance.

  Hereinafter, embodiments of the present invention will be described in detail. The present invention is not limited to the following embodiments, and various modifications can be made within the scope of the invention. In the present invention, “wt%” and “mass%”, “wt ppm” and “mass ppm”, and “parts by weight” and “parts by mass” have the same meaning.

This invention relates to an automotive interior / exterior member made of a polycarbonate resin composition containing a specific amount of a specific component.
[Polycarbonate resin composition]
The polycarbonate resin composition includes a specific polycarbonate resin, butyl acrylate-methyl methacrylate-styrene rubber (hereinafter sometimes referred to as “BA-MA-S rubber”), dibutylhydroxytoluene (component (A)). ), Diphenyldimethicone (component (B)) having a kinematic viscosity at 23 ° C. of 4000 to 5500 cSt, hindered amine light stabilizer (component (C)) having a melting point of 125 ° C. to 130 ° C., melting point of 102 ° C. to 106 ° C. Benzotriazole light stabilizer (component (D)), tris (2,4-di-t-butylphenyl) phosphite (component (E)) and hindered phenol antioxidant (molecular weight 1100-1200) A thermoplastic resin composition containing a predetermined amount of the thermoplastic resin composition containing (F) component.

[Polycarbonate resin]
The polycarbonate resin of the present invention is a molten mixture obtained by melting and mixing a plurality of carbonate copolymers.
The plurality of carbonate copolymers constituting the polycarbonate resin are all carbonate copolymers composed of structural units derived from two or more kinds of dihydroxy compounds, that is, at least using these two or more kinds of dihydroxy compounds. A carbonate copolymer obtained by polymerization.
Among the structural units derived from two or more kinds of dihydroxy compounds, the structural units derived from the following two kinds of dihydroxy compounds have at least the essential structural units in all of the plurality of carbonate copolymers.
One of the essential structural units is a structural unit derived from a dihydroxy compound represented by the following general formula (1) as a dihydroxy compound (hereinafter sometimes referred to as “structural unit (1)”). And the other is a structural unit derived from cyclohexanedimethanol (hereinafter sometimes referred to as “CHDM unit”).
The polycarbonate resin is a mixture obtained by melt-mixing a plurality of carbonate copolymers having different copolymerization ratios of the polyol component, specifically, the copolymerization ratio of the structural unit (1) and the CHDM unit. .

<Dihydroxy compound represented by Formula (1)>
Examples of the dihydroxy compound represented by the formula (1) include isosorbide (ISB), isomannide, and isoide which are in a stereoisomeric relationship.
These dihydroxy compounds represented by the formula (1) may be used singly or in combination of two or more.
Among these dihydroxy compounds represented by the formula (1), there are abundant resources, readily available, and isosorbides obtained by dehydrating condensation of sorbitol produced from various starches are obtained and produced. Most preferable from the viewpoints of ease of processing, optical properties, and moldability.
In the following description, “structural unit (1)” may be referred to as “ISB unit”.

<Cyclohexanedimethanol>
Specific examples of the cyclohexanedimethanol include 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, and the like.

<Carbonated diester>
The carbonate copolymer can be produced by a generally used polymerization method, and the polymerization method may be any of an interfacial polymerization method using phosgene and a melt polymerization method in which a transesterification reaction with a carbonic acid diester is performed. In the presence of a polymerization catalyst, a melt polymerization method in which a dihydroxy compound is reacted with a carbon dioxide diester having lower toxicity to the environment is preferred.

  In this case, the carbonate copolymer can be obtained by a melt polymerization method in which a dihydroxy compound represented by the general formula (1) and a dihydroxy compound containing at least cyclohexanedimethanol and a carbonic acid diester are subjected to an ester exchange reaction.

  As a carbonic acid diester used, what is represented by following formula (2) is mentioned normally. These carbonic acid diesters may be used alone or in combination of two or more.

In the above formula (2), A ¹ and A ² are each independently a substituted or unsubstituted aliphatic group having 1 to 18 carbon atoms, or a substituted or unsubstituted aromatic group.

  Examples of the carbonic acid diester represented by the above formula (2) include substituted diphenyl carbonates such as diphenyl carbonate and ditolyl carbonate, dimethyl carbonate, diethyl carbonate, and di-t-butyl carbonate, preferably diphenyl carbonate. Substituted diphenyl carbonate such as carbonate, particularly preferably diphenyl carbonate. Carbonic acid diesters may contain impurities such as chloride ions, and these impurities may hinder the polymerization reaction or worsen the hue of the resulting carbonate copolymer. It is preferable to use a product purified by distillation or the like.

  The carbonic acid diester is preferably used in a molar ratio of 0.90 to 1.20, more preferably in a molar ratio of 0.95 to 1.10, based on all dihydroxy compounds used in the melt polymerization. It is even more preferable to use at a molar ratio of .96 to 1.10, and particularly preferable to use at a molar ratio of 0.98 to 1.04.

  When this molar ratio is less than 0.90, the terminal hydroxyl group of the produced carbonate copolymer is increased, the thermal stability of the polymer is deteriorated, and when the polycarbonate resin composition is molded, coloring occurs. There is a possibility that the rate of the transesterification reaction decreases, or the desired high molecular weight product cannot be obtained.

  On the other hand, when the molar ratio is greater than 1.20, the transesterification rate decreases under the same conditions, making it difficult to produce a carbonate copolymer having a desired molecular weight. The amount of residual carbonic acid diester in the coalescence increases, and this residual carbonic acid diester may be unfavorable at the time of molding or causing odor of the molded product. There is a possibility of deteriorating the hue and light resistance of the polycarbonate resin.

  Furthermore, when the molar ratio of the carbonic acid diester to the total dihydroxy compound increases, the amount of residual carbonic acid diester in the resulting carbonate copolymer increases, which absorbs ultraviolet rays and deteriorates the light resistance of the carbonate copolymer. In some cases, it is not preferable. The concentration of the carbonic acid diester remaining in the polycarbonate resin of the present invention is preferably 200 ppm by weight or less, more preferably 100 ppm by weight or less, particularly preferably 60 ppm by weight or less, and particularly preferably 30 ppm by weight or less. However, in reality, the carbonate copolymer may contain unreacted carbonic acid diester, and the lower limit value of the unreacted carbonic acid diester concentration in the polycarbonate resin is usually 1 ppm by weight.

<Transesterification reaction catalyst>
The carbonate copolymer of the present invention is produced by transesterifying the dihydroxy compound containing the dihydroxy compound having the structural unit (1) and the cyclohexanedimethanol as described above with the carbonic acid diester represented by the above formula (2). can do. More specifically, it can be obtained by transesterification to remove by-product monohydroxy compounds and the like out of the system. In this case, melt polymerization is usually carried out by transesterification in the presence of a transesterification catalyst.

  Examples of the transesterification reaction catalyst (hereinafter sometimes referred to as “catalyst”) that can be used in the production of the carbonate copolymer of the present invention include, for example, Group 1 in the Long Periodic Periodic Table (Nomenclature of Inorganic Chemistry IUPAC Recommendations 2005). Or basic compounds such as metal compounds, basic boron compounds, basic phosphorus compounds, basic ammonium compounds, and amine compounds of Group 2 (hereinafter simply referred to as “Group 1” and “Group 2”). It is done. Among these, Preferably a group 1 metal compound and / or a group 2 metal compound are used.

  It is possible to use a basic compound such as a basic boron compound, a basic phosphorus compound, a basic ammonium compound, and an amine compound in combination with the Group 1 metal compound and / or the Group 2 metal compound. It is particularly preferred to use only Group 1 metal compounds and / or Group 2 metal compounds.

  In addition, the group 1 metal compound and / or the group 2 metal compound are usually used in the form of a hydroxide or a salt such as a carbonate, a carboxylate, or a phenol salt. From the viewpoint of easiness, a hydroxide, carbonate, and acetate are preferable, and acetate is preferable from the viewpoint of hue and polymerization activity.

  Examples of the Group 1 metal compound include sodium hydroxide, potassium hydroxide, lithium hydroxide, cesium hydroxide, sodium hydrogen carbonate, potassium hydrogen carbonate, lithium hydrogen carbonate, cesium hydrogen carbonate, sodium carbonate, potassium carbonate, lithium carbonate, Cesium carbonate, sodium acetate, potassium acetate, lithium acetate, cesium acetate, sodium stearate, potassium stearate, lithium stearate, cesium stearate, sodium borohydride, potassium borohydride, lithium borohydride, cesium borohydride , Sodium borohydride, potassium borohydride, lithium phenide boron, cesium phenide boron, sodium benzoate, potassium benzoate, lithium benzoate, cesium benzoate, 2 sodium hydrogen phosphate 2 potassium potassium phosphate, 2 lithium hydrogen phosphate, 2 cesium hydrogen phosphate, 2 sodium phenyl phosphate, 2 potassium phenyl phosphate, 2 lithium phenyl phosphate, 2 cesium phenyl phosphate, sodium, potassium, lithium, Examples include cesium alcoholate, phenolate, disodium salt of bisphenol A, 2 potassium salt, 2 lithium salt, 2 cesium salt, etc. Among them, cesium compound and lithium compound are preferable.

  Examples of the Group 2 metal compound include calcium hydroxide, barium hydroxide, magnesium hydroxide, strontium hydroxide, calcium hydrogen carbonate, barium hydrogen carbonate, magnesium hydrogen carbonate, strontium hydrogen carbonate, calcium carbonate, barium carbonate, magnesium carbonate, Strontium carbonate, calcium acetate, barium acetate, magnesium acetate, strontium acetate, calcium stearate, barium stearate, magnesium stearate, strontium stearate, etc., among which magnesium compounds, calcium compounds, barium compounds are preferred, magnesium compounds and / Or a calcium compound is still more preferable.

  Examples of basic boron compounds include tetramethylboron, tetraethylboron, tetrapropylboron, tetrabutylboron, trimethylethylboron, trimethylbenzylboron, trimethylphenylboron, triethylmethylboron, triethylbenzylboron, triethylphenylboron, tributylbenzyl. Examples include sodium, potassium, lithium, calcium, barium, magnesium, or strontium salts such as boron, tributylphenylboron, tetraphenylboron, benzyltriphenylboron, methyltriphenylboron, butyltriphenylboron, etc. It is done.

  Examples of the basic phosphorus compound include triethylphosphine, tri-n-propylphosphine, triisopropylphosphine, tri-n-butylphosphine, triphenylphosphine, tributylphosphine, and quaternary phosphonium salts.

  Examples of the basic ammonium compound include tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide, trimethylethylammonium hydroxide, trimethylbenzylammonium hydroxide, trimethylphenylammonium hydroxide, Triethylmethylammonium hydroxide, triethylbenzylammonium hydroxide, triethylphenylammonium hydroxide, tributylbenzylammonium hydroxide, tributylphenylammonium hydroxide, tetraphenylammonium hydroxide, benzyltriphenylammonium hydroxide, methyltriphenylammonium hydroxide Sid, butyl triphenyl ammonium hydroxide, and the like.

  Examples of the amine compound include 4-aminopyridine, 2-aminopyridine, N, N-dimethyl-4-aminopyridine, 4-diethylaminopyridine, 2-hydroxypyridine, 2-methoxypyridine, 4-methoxypyridine, 2 -Dimethylaminoimidazole, 2-methoxyimidazole, imidazole, 2-mercaptoimidazole, 2-methylimidazole, aminoquinoline and the like.

  Among these, the use of at least one metal compound selected from the group consisting of Group 2 metal compounds and lithium compounds as a catalyst is excellent in various physical properties such as transparency, hue, and light resistance of the resulting polycarbonate resin. It is preferable for the purpose.

  In order to make the carbonate copolymer particularly excellent in transparency, hue and light resistance, the catalyst is at least one metal compound selected from the group consisting of magnesium compounds, calcium compounds and barium compounds. Of these, at least one metal compound selected from the group consisting of a magnesium compound and a calcium compound is preferable.

  In the case of a Group 1 metal compound and / or a Group 2 metal compound, the amount of the catalyst used is preferably 0.1 to 300 μmol, more preferably as a metal conversion amount with respect to 1 mol of all dihydroxy compounds subjected to the reaction. It is in the range of 0.1 to 100 μmol, more preferably 0.5 to 50 μmol, and even more preferably 1 to 25 μmol.

  Among the above, when using a compound containing at least one metal selected from the group consisting of group 2 metals, the amount in terms of metal is preferably 0.1 μmol or more, more preferably, per 1 mol of all dihydroxy compounds subjected to the reaction. Is 0.5 μmol or more, particularly preferably 0.7 μmol or more. The upper limit is preferably 20 μmol, more preferably 10 μmol, particularly preferably 3 μmol, and most preferably 2.0 μmol.

  If the amount of the catalyst used is too small, the polymerization activity necessary for producing a carbonate copolymer having a desired molecular weight may not be obtained, and sufficient breaking energy may not be obtained. On the other hand, if the amount of the catalyst used is too large, not only the hue of the resulting carbonate copolymer will deteriorate, but also by-products will be generated, resulting in a decrease in fluidity and the generation of gel, resulting in brittle fracture. This may cause the production of the target quality carbonate copolymer may be difficult.

<Method for producing carbonate copolymer>
The carbonate copolymer is obtained by melt-polymerizing a dihydroxy compound containing the dihydroxy compound represented by the above general formula (1) and cyclohexanedimethanol and a carbonic acid diester by a transesterification reaction. The compound and the carbonic acid diester are preferably mixed uniformly before the transesterification reaction.

  The mixing temperature is usually 80 ° C. or higher, preferably 90 ° C. or higher, and the upper limit is usually 250 ° C. or lower, preferably 200 ° C. or lower, more preferably 150 ° C. or lower. Among these, 100 ° C. or higher and 120 ° C. or lower is preferable. If the mixing temperature is too low, the dissolution rate may be slow or the solubility may be insufficient, often causing problems such as solidification, and if the mixing temperature is too high, the dihydroxy compound may be thermally deteriorated. The hue of the polycarbonate resin thus obtained may deteriorate, which may adversely affect light resistance.

The carbonate copolymer is preferably produced by melt polymerization in multiple stages using a plurality of reactors using a catalyst.
The type of reaction may be any of batch type, continuous type, or a combination of batch type and continuous type.
Furthermore, it is effective to use a reflux condenser for the polymerization reactor in order to suppress the amount of the monomer to be distilled off, and the effect is particularly great in a reactor at the initial stage of polymerization where there are many unreacted monomer components.
In order to maintain the polymerization rate appropriately and suppress the distillation of the monomer, while keeping the hue, thermal stability, light resistance, etc. of the final polycarbonate resin (mixture of carbonate copolymer). For this purpose, it is important to select the type and amount of the aforementioned catalyst.

  In the production of the carbonate copolymer, if there are two or more reactors, the reactor is further provided with a plurality of reaction stages having different conditions, and the temperature and pressure are continuously changed. May be.

  In the production of the carbonate copolymer, the catalyst can be added to the raw material preparation tank, the raw material storage tank, or can be added directly to the reactor, but from the viewpoint of supply stability and control of melt polymerization, A catalyst supply line is installed in the middle of the raw material line before being supplied to the reactor, and is preferably supplied as an aqueous solution.

  As the polymerization conditions, it is preferable to obtain a prepolymer at a relatively low temperature and low vacuum in the initial stage of polymerization and to increase the molecular weight to a predetermined value at a relatively high temperature and high vacuum in the late stage of polymerization. Appropriate selection of the jacket temperature and internal temperature at the stage and the pressure in the reaction system is important from the viewpoint of the hue and light resistance of the resulting polycarbonate resin. For example, if either the temperature or the pressure is changed too quickly before the polymerization reaction reaches a predetermined value, the unreacted monomer will be distilled, causing the molar ratio of the dihydroxy compound and the carbonic acid diester to change, resulting in a decrease in the polymerization rate. Or a polymer having a predetermined molecular weight or terminal group may not be obtained, and as a result, the object of the present invention may not be achieved.

  If the temperature of the transesterification reaction is too low, it may cause a decrease in productivity and an increase in the thermal history of the product, and if it is too high, it may not only cause evaporation of the monomer but also promote decomposition and coloring of the carbonate copolymer. There is.

  In the production of the carbonate copolymer, the transesterification reaction of the dihydroxy compound represented by the general formula (1) and the dihydroxy compound containing cyclohexanedimethanol and the carbonic acid diester in the presence of a catalyst is usually performed in two stages. The above multistage process is performed.

  When the transesterification reaction temperature is excessively high, the hue is deteriorated when formed into a molded product, which may easily cause brittle fracture. When the transesterification reaction temperature is too low, the target molecular weight does not increase, the molecular weight distribution becomes wide, and the impact strength may be inferior. Further, if the residence time of the transesterification reaction is excessively long, brittle fracture may easily occur. If the residence time is too short, the target molecular weight may not increase and the impact strength may be inferior.

  In addition, Group 1 metals, especially lithium, sodium, potassium, cesium, especially sodium, potassium, cesium, may be mixed not only from the catalyst used but also from raw materials and reactors. If contained in a large amount, the hue may be adversely affected. Therefore, the total content of these compounds in the polycarbonate resin of the present invention is preferably small, and the amount of metal in the polycarbonate resin is usually 1 wt. ppm or less, preferably 0.8 ppm by weight or less, more preferably 0.7 ppm by weight or less.

  The amount of metal in the polycarbonate resin (carbonate copolymer mixture) can be measured by various conventionally known methods. After recovering the metal in the polycarbonate resin by a method such as wet ashing, atomic emission is performed. It can be measured using a method such as atomic absorption, Inductively Coupled Plasma (ICP).

The carbonate copolymer of the present invention is usually cooled and solidified after melt polymerization as described above, and pelletized with a rotary cutter or the like.
The method of pelletization is not limited. For example, the polycarbonate resin is extracted from the final polymerization reactor in a molten state, cooled and solidified in the form of a strand, and pelletized. Alternatively, the resin is supplied to a twin-screw extruder, melt-extruded, cooled and solidified to be pelletized, or extracted from the final polymerization reactor in a molten state, cooled and solidified in the form of a strand, and once pelletized. After that, after the resin is again supplied to the single-screw or twin-screw extruder and melt-extruded, it is cooled and solidified to form a pellet.

  At that time, in the extruder, the residual monomer under reduced pressure devolatilization, and generally known heat stabilizers, neutralizers, UV absorbers, mold release agents, colorants, antistatic agents, lubricants, lubricants, A plasticizer, a compatibilizer, a flame retardant, etc. can be added and kneaded.

  In addition, the carbonate copolymer thus produced may be blended with one or more thermal stabilizers in order to prevent a decrease in molecular weight and a deterioration in hue at the time of molding or the like.

Such heat stabilizers include phosphorous acid, phosphoric acid, phosphonous acid, and phosphonic acid.
Such a heat stabilizer can be further added in addition to the addition amount added at the time of melt polymerization. That is, after blending an appropriate amount of a phosphorous acid compound or phosphoric acid compound to obtain a polycarbonate resin, if a phosphorous acid compound is further blended by a blending method described later, transparency during polymerization is reduced, coloring Further, it is possible to blend more heat stabilizers while avoiding a decrease in heat resistance, and it is possible to prevent deterioration of hue.

  The content of these heat stabilizers is preferably 0.0001 to 1 part by weight, more preferably 0.0005 to 0.5 part by weight, with respect to 100 parts by weight of the carbonate copolymer. 2 parts by weight is more preferred.

<Physical properties of polycarbonate resin (or carbonate copolymer)>
The preferred physical properties of the polycarbonate resin (or carbonate copolymer) of the present invention are shown below.

(Glass-transition temperature)
The polycarbonate resin (or carbonate copolymer) of the present invention has a glass transition temperature (Tg) of less than 145 ° C. When the glass transition temperature of the polycarbonate resin (or carbonate copolymer) is too high beyond this range, it tends to be colored and it may be difficult to improve the impact strength. In this case, it is necessary to set the mold temperature high when transferring the shape of the mold surface to the molded product during molding. For this reason, the temperature controller that can be selected may be limited, or the transferability of the mold surface may be deteriorated.

The glass transition temperature of the polycarbonate resin (or carbonate copolymer) of the present invention is more preferably less than 140 ° C, and still more preferably less than 135 ° C.
The glass transition temperature of the polycarbonate resin (or carbonate copolymer) of the present invention is usually 90 ° C. or higher, preferably 95 ° C. or higher.

As a method for setting the glass transition temperature of the polycarbonate resin (or carbonate copolymer) of the present invention to less than 145 ° C., the proportion of the structural unit (1) in the polycarbonate resin (or carbonate copolymer) is decreased, or the polycarbonate As the dihydroxy compound used for the production of the resin (or carbonate copolymer), an alicyclic dihydroxy compound with low heat resistance is selected, or an aromatic dihydroxy compound such as a bisphenol compound in a polycarbonate resin (or carbonate copolymer) The method of reducing the ratio of the structural unit originating in is mentioned.
In addition, the glass transition temperature of the polycarbonate resin (or carbonate copolymer) of this invention is measured by the method as described in the below-mentioned Example.

(Reduced viscosity)
The degree of polymerization of the polycarbonate resin (or carbonate copolymer) of the present invention is such that a mixed solvent of phenol and 1,1,2,2, -tetrachloroethane in a weight ratio of 1: 1 is used as the solvent, and the polycarbonate resin concentration is 1. The reduced viscosity measured precisely at 00 g / dl and measured at a temperature of 30.0 ° C. ± 0.1 ° C. (hereinafter sometimes simply referred to as “reduced viscosity”) is preferably 0.40 dl / g or more, More preferably 0.42 dl / g or more, particularly preferably 0.45 dl / g or more, but depending on the use of the polycarbonate resin composition of the present invention, 0.60 dl / g or more, further 0.85 dl / g or more. May be suitably used. The reduced viscosity of the polycarbonate resin (or carbonate copolymer) of the present invention is preferably 2.0 dl / g or less, more preferably 1.7 dl / g or less, and particularly preferably 1.4 dl / g or less. If the reduced viscosity of the polycarbonate resin (or carbonate copolymer) is excessively low, the mechanical strength may be weakened. If the reduced viscosity of the polycarbonate resin (or carbonate copolymer) is excessively high, molding may occur. There is a tendency that fluidity is lowered, cycle characteristics are lowered, distortion of the molded product is increased, and the product is easily deformed by heat.

[Production of polycarbonate resin (mixing of carbonate copolymer)]
The polycarbonate resin of the present invention is obtained by melt-mixing a plurality of carbonate copolymers having different copolymerization ratios. The melt mixing temperature is preferably 235 ° C. to 245 ° C. and preferably 238 ° C. to 242 ° C. as the resin temperature of the melt extrusion port. By setting it within this range, it is possible to obtain a good polycarbonate resin mixture having a high impact strength by suppressing the coloring, thermal deterioration, or burning of the polycarbonate resin.

  The range of the respective copolymer ratios of the plurality of carbonate copolymers having different copolymer ratios, and the mixture ratio of the plurality of polycarbonate copolymers are the copolymer ratios of the polycarbonate resin mixture obtained after mixing (different carbonate copolymers). (Copolymerization ratio obtained by averaging the mixing ratios) is appropriately selected under conditions that satisfy a predetermined range. As a copolymerization ratio of the polycarbonate resin mixture obtained after the mixing, the amount (number of moles) of the structural unit (1) with respect to the total amount (number of moles) of the structural unit (1) and CHDM units is 67 mol% or more. Preferably, it is 67.5 mol% or more. Furthermore, the upper limit is 69 mol% or less, preferably 68.5 mol% or less. The amount (number of moles) of CHDM units relative to the total amount (number of moles) is 31 mol% or more, preferably 31.5 mol% or more. Furthermore, the upper limit is 33 mol% or less, and is 32.5 mol% or less.

  When the amount of the structural unit (1) with respect to the total amount (number of moles) is less than 67 mol% (the amount of CHDM units with respect to the total amount (number of moles) is greater than 33 mol%), the heat resistance decreases. May cause dots. On the other hand, when the amount of the structural unit (1) relative to the total amount (number of moles) is more than 69 mol% (the amount of CHDM units relative to the total amount (number of moles) is less than 31 mol%), impact resistance is lowered May cause problems.

[Butyl acrylate-methyl methacrylate-styrene rubber (BA-MA-S rubber)]
In the polycarbonate resin composition, butyl acrylate-methyl methacrylate-styrene rubber is contained in the polycarbonate resin. In the present specification, “butyl acrylate-methyl methacrylate-styrene rubber” is hereinafter referred to as “BA-MA-S rubber” as appropriate.

  As the BA-MA-S rubber, a core-shell type graft copolymer obtained by graft copolymerization using a polymer component called a rubber component as a core layer and a monomer component copolymerizable therewith as a shell layer is usually used. preferable. That is, the BA-MA-S rubber preferably has a core layer composed of a polymer component and a shell layer covering the core layer, and the shell layer is a monomer component copolymerizable with the polymer of the core layer. This monomer component is preferably graft copolymerized with the polymer of the core layer.

  The method for producing the core-shell type graft copolymer may be any method such as bulk polymerization, solution polymerization, suspension polymerization, and emulsion polymerization. The copolymerization method may be a single-stage graft or a multistage graft. As the BA-MA-S rubber such as the core-shell type graft copolymer, a commercially available product can be usually used. Although it does not restrict | limit especially as a commercial item, For example, the following are mentioned.

  For example, Kaneka Co., Ltd., trade name Kane Ace M-590, manufactured by Mitsubishi Rayon Co., Ltd., trade names Metabrene Metabrene W-341, W-377, Metabrene W-341, Mitsubishi Rayon Co., Ltd., trade name Acripet IR377, IR441, IR491, etc. are mentioned. Among these, Kaneka Co., Ltd. product name Kane Ace M-590 is most preferable because of its high refractive index and high heat resistance.

  The monomer component that can be graft-copolymerized with the polymer component of the core layer constituting the shell layer is a (meth) acrylic acid ester compound, specifically, butyl acrylate and methyl methacrylate. Here, “(meth) acryl” is a general term for “acryl” and “methacryl”.

The core-shell type graft copolymer preferably contains 40% by weight or more, more preferably 60% by weight or more of the butyl acrylate-styrene copolymer component. Moreover, what contains 10 weight% or more of (meth) acrylic acid ester components is preferable. Here, in the core-shell type graft copolymer, the “butyl acrylate-styrene copolymer” portion corresponds to the core layer.
BA-MA-S rubbers such as core-shell type graft copolymers may be used alone or in combination of two or more.

  In the above polycarbonate resin composition, butyl acrylate-methyl methacrylate-styrene rubber (BA-MA-S rubber) when the total amount of polycarbonate resin and butyl acrylate-methyl methacrylate-styrene rubber is 100 parts by weight. ) Is preferably 4.0 parts by weight or more, and more preferably 4.5 parts by weight or more. Further, the upper limit of the blending amount is preferably 6.0 parts by weight, and preferably 5.55 parts by weight. When exceeding the said range, heat resistance falls and the problem that heat resistance becomes inadequate as a use of the interior / exterior member for motor vehicles may arise. In this case, the appearance of the automotive interior / exterior member may be deteriorated.

[Production Method of Polycarbonate Resin Composition]
The polycarbonate resin composition can be produced by melt-mixing a polycarbonate resin, the BA-MA-S rubber, and an additive described later.

  Specifically, first, using an extruder, for example, the above-mentioned plurality of types of polycarbonate copolymer (polycarbonate resin), BA-MA-S rubber, and various additives are mixed and pressed into a strand shape. put out. Next, the extruded resin composition is cut into pellets with a rotary cutter or the like. Thereby, for example, a pellet-like polycarbonate resin composition can be obtained.

<Additives>
As described above, as described above, dibutylhydroxytoluene (component (A)), diphenyldimethicone (component (B)) having a kinematic viscosity of 4000 to 5500 cSt at 23 ° C., hindered amine having a melting point of 125 ° C. to 130 ° C. Light stabilizer (component (C)), benzotriazole light stabilizer (melting component (D)) having a melting point of 102 ° C. to 106 ° C., tris (2,4-di-t-butylphenyl) phosphite (( E) component) and hindered phenolic antioxidants (component (F)) having a molecular weight of 1100 to 1200.

[(A) component (dibutylhydroxytoluene)]
Dibutylhydroxytoluene is blended in the polycarbonate resin composition of the present invention as the component (A). By blending this, it is possible to exhibit the characteristics of suppressing the decrease in molecular weight during the light resistance test, that is, improving the light resistance.

  The content of the component (A) with respect to the total 100 parts by weight of the polycarbonate resin and the BA-MA-S rubber of the present invention is preferably 0.001 part by weight or more, and preferably 0.003 part by weight or more. If the amount is less than the above range, there may be a problem that the molecular weight reduction suppressing effect during the light resistance test is not sufficient. On the other hand, the upper limit of the content of component (A) is preferably 0.015 part by weight or less, and preferably 0.011 part by weight or less. If it is more than the above range, there may be a problem that the amount of deposits on the mold increases.

[Component (B) (diphenyl dimethicone having a kinematic viscosity at 23 ° C. of 4000 to 5500 cSt)]
In the polycarbonate resin composition of the present invention, diphenyl dimethicone having a kinematic viscosity at 23 ° C. of 4000 to 5500 cSt is blended as the component (B). By blending this, the scratch resistance is improved, and scratches that may occur during use of the molded product can be prevented. Further, since the difference in refractive index from the resin can be reduced by the phenyl group contained in diphenyldimethicone, the color developability is improved, and thus a molded product having a high quality appearance can be obtained. Diphenyl dimethicone having a kinematic viscosity at 23 ° C. of 4000 to 5500 cSt has an effect of improving the releasability during molding. Therefore, it becomes possible to manufacture a molded product having a complicated shape.

  From the viewpoint of enhancing the color developability of the molded article of the polycarbonate resin composition, diphenyl dimethicone having a kinematic viscosity at 23 ° C. of 4000 to 5500 cSt preferably has a high refractive index. Specifically, the refractive index of diphenyl dimethicone having a kinematic viscosity at 23 ° C. of 4000 to 5500 cSt is preferably 1.49 or more, and more preferably 1.495 or more. When the refractive index is greater than 1.49, the characteristics of improving transparency can be exhibited more. On the other hand, the upper limit of the refractive index is preferably 1.51 and preferably 1.505. When the refractive index is less than 1.51, the feature of improving transparency can be exhibited more.

  The difference in refractive index between the polycarbonate resin mixture of the present invention and diphenyldimethicone having a kinematic viscosity at 23 ° C. of 4000-5500 cSt is preferably within ± 0.1, more preferably within ± 0.05. More preferably within ± 0.01. By adjusting the difference in refractive index within the above range, the transparency can be further improved, and the sharpness at the time of coloring can be further improved.

  In the polycarbonate resin composition of the present invention, the content of the component (B) with respect to 100 parts by weight of the total of the polycarbonate resin and the BA-MA-S rubber is preferably 0.05 parts by weight or more, and preferably 0.06 parts by weight or more. . When the amount is less than 0.05 parts by weight, there may be a problem that the effect of suppressing the decrease in molecular weight during the light resistance test is not sufficient. On the other hand, the upper limit of the content of component (B) is preferably 0.31 parts by weight, and preferably 0.30 parts by weight. When the amount is more than 0.31 part by weight, there may be a problem that the amount of deposits on the mold increases.

[(C) component (hindered amine light-resistant stabilizer having a predetermined melting point)]
In the polycarbonate resin composition of the present invention, a hindered amine light-resistant stabilizer having a predetermined melting point is blended as the component (C). By blending this, it is possible to exhibit the feature of suppressing the decrease in molecular weight during the light resistance test.

  The melting point of the hindered amine light-resistant stabilizer is essential to be 125 ° C. or higher, and preferably 127 ° C. or higher. If it is lower than 125 ° C., there may be a problem that the light resistance is deteriorated. On the other hand, the upper limit of the melting point is preferably 130 ° C. or less, and preferably 129 ° C. or less. When it is higher than 130 ° C., there is a case where the compatibility as the resin composition is deteriorated.

  The hindered amine light stabilizer having a melting point of 125 to 130 ° C. preferably has a structure in which nitrogen is part of a cyclic structure, and more preferably has a piperidine structure. The piperidine structure defined here may be any structure as long as it is a saturated 6-membered cyclic amine structure, and includes a structure in which a part of the piperidine structure is substituted with a substituent. Examples of the substituent that the piperidine structure may have include an alkyl group having 4 or less carbon atoms, and a methyl group is particularly preferable. Further, the amine compound is preferably a compound having a plurality of piperidine structures, and when it has a plurality of piperidine structures, a compound in which those piperidine structures are linked to one alkane chain by an ester structure is preferable. Specific examples of such hindered amine light-resistant stabilizers include compounds represented by the following formula (3).

  The content of the component (C) with respect to the total 100 parts by weight of the polycarbonate resin and the BA-MA-S rubber of the present invention is preferably 0.05 parts by weight or more, and preferably 0.06 parts by weight or more. If it is less than 0.05 parts by weight, there may be a problem that the effect of suppressing the decrease in molecular weight during the light resistance test is not sufficient. On the other hand, the upper limit of the content of the component (C) is preferably 0.21 part by weight or less, and preferably 0.20 part by weight or less. When the amount is more than 0.21 part by weight, there may be a problem that the amount of deposits on the mold increases.

[(D) component (benzotriazole light-resistant stabilizer having a predetermined melting point)}}
In the polycarbonate resin composition of the present invention, a benzotriazole-based light-resistant stabilizer having a predetermined melting point is blended as the component (D). By blending this, it is possible to exhibit the feature of suppressing the decrease in molecular weight during the light resistance test.

  The melting point of the above-mentioned benzotriazole-based light stabilizer is essential to be 102 ° C. or higher, and preferably 103 ° C. or higher. If it is lower than 102 ° C., there may be a problem that the light resistance is lowered. On the other hand, the upper limit of the melting point is preferably 106 ° C. or lower, and preferably 104 ° C. or lower. If it is higher than 106 ° C., there may be a problem that the light resistance performance during actual exposure becomes difficult to be exhibited.

  More specific examples of benzotriazole light stabilizers having a melting point of 102 to 106 ° C. include 2- (2H-benzotriazol-2-yl) -4- (1,1,3,3-tetramethylbutyl) Examples include phenol.

  The compounding amount of the component (D) with respect to 100 parts by weight of the total of the polycarbonate resin and BA-MA-S rubber of the present invention is preferably 0.05 parts by weight or more, and preferably 0.06 parts by weight or more. If it is less than 0.05 parts by weight, there may be a problem that the effect of suppressing the decrease in molecular weight during the light resistance test is not sufficient. On the other hand, the upper limit of the content of the component (D) is preferably 0.31 part by weight or less, and preferably 0.30 part by weight or less. When the amount is more than 0.31 part by weight, there may be a problem that the amount of deposits on the mold increases.

[Component (E) (Tris (2,4-di-t-butylphenyl) phosphite)]
In the polycarbonate resin composition of the present invention, tris (2,4-di-t-butylphenyl) phosphite is blended as the component (E).
The blending amount of the component (E) is preferably 0.049 parts by weight or more and preferably 0.0495 parts by weight or more with respect to 100 parts by weight in total of the polycarbonate resin and the BA-MA-S rubber of the present invention. It is preferable to add more than the above range because the effect of improving surface impact resistance and impact resistance is easily improved. On the other hand, the upper limit of the amount of component (E) is preferably 0.051 part by weight or less, and preferably 0.050 part by weight or less. If it is below the above range, it is preferable from the viewpoints of the appearance and heat resistance of the molded product which is the automotive interior / exterior member according to the present invention.

[(F) component (specific hindered phenol-based antioxidant)]
The polycarbonate resin composition of the present invention contains a hindered phenolic antioxidant having a specific molecular weight as the component (F).

  The molecular weight of the hindered phenol antioxidant is preferably 1100 or more, and preferably 1120 or more. If it is smaller than 1100, there may be a problem that the effect of preventing oxidation deterioration is low. On the other hand, the upper limit of the molecular weight is preferably 1200 and is preferably 1180. If it is larger than 1200, the resin composition may have poor compatibility.

  Examples of the hindered phenol antioxidant having a molecular weight of 1100 to 1200 include compounds such as pentaerythritol-tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate].

  Component (F) is preferably added in an amount of 0.09 parts by weight or more, preferably 0.094 parts by weight or more, based on 100 parts by weight of the total of the polycarbonate resin and BA-MA-S rubber of the present invention. 096 parts by weight or more is more preferable. It is preferable to add more than the above range because the effect of improving surface impact resistance and impact resistance is easily improved. On the other hand, the upper limit of the amount of component (F) is preferably 0.11 part by weight or less, preferably 0.108 part by weight or less, and more preferably 0.106 part by weight or less. If it is below the above range, it is preferable from the viewpoint of the appearance of a molded article which is an automotive interior / exterior member according to the present invention.

[Mixing method]
As a mixing method of the above-mentioned plural types of polycarbonate copolymers, the BA-MA-S rubber, and the components (A) to (F), for example, a tumbler, a V-type blender, a super mixer, a nauter mixer, a Banbury mixer, There are kneading rolls, a method of mixing and kneading with an extruder, etc., or a solution blending method of mixing in a state of being dissolved in a common good solvent such as methylene chloride, but this is not particularly limited, Any method may be used as long as it is a commonly used blending method.

  Specifically, for example, the above-mentioned polycarbonate copolymer in pellet form and various components are mixed using an extruder, extruded into a strand form, and cut into a pellet form with a rotary cutter or the like, thereby the thermoplastic resin of the present invention. A composition can be obtained.

  The polycarbonate resin composition of the present invention thus obtained is generally known such as an extrusion molding method, an injection molding method, a compression molding method, etc., after each component is mixed and once or directly pelletized with a melt extruder. It can be formed into a desired shape by the forming method.

[Polycarbonate resin molded product]
By molding the polycarbonate resin composition of the present invention, the automotive interior / exterior member of the present invention can be obtained.
Preferably, the automotive interior / exterior member of the present invention is formed by an injection molding method.
In this case, the automotive interior / exterior member of the present invention having a complicated shape can be produced.

  Next, the present invention will be described in more detail with reference to examples. The present invention is not limited to these examples. First, the evaluation method will be described.

[Evaluation methods]
(1) Charpy impact strength Pellets of the polycarbonate resin composition were dried at 90 ° C for 6 hours using a hot air dryer. Next, an ISO test piece for mechanical properties was molded from the dried and dried polycarbonate resin composition using an injection molding machine (EC-75SX manufactured by Toshiba Machine Co., Ltd.). About the ISO test piece for mechanical properties obtained above, the Charpy impact test with a notch was implemented by the method described in ISO179-1: 2010. Higher values indicate higher impact resistance.

(2) Light resistance test (ΔE ^* )
A sheet of 100 mm × 100 mm × 2 mmt was molded from the dried polycarbonate resin composition using an injection molding machine (EC-75SX manufactured by Toshiba Machine Co., Ltd.). Using a Xenon light resistance tester Ci4000 manufactured by Atlas Co., in accordance with JISD0205, using a xenon arc lamp under conditions of a black panel temperature of 89 ° C. and a relative humidity of 50%, a wavelength range of 300 to 400 nm, and a sample surface radiation intensity of The test was performed at an integrated irradiation intensity of 200 MJ / m ² through an outer glass filter of soda lime glass and an inner filter of borosilicate glass at 100 W / m ² . Using the method described in JIS Z 8722, SE ^* 2000 manufactured by Nippon Denshoku Industries Co., Ltd. was used to measure L ^* a ^* b ^* after the irradiation treatment by the D65 / 10 light source reflection method. From this, ΔE ^* was determined.

(3) Abrasion resistance test Using a surface property measuring instrument (manufactured by Shinto Kagaku Co., Ltd., model: Tribogear TYPE-14), fold the tissue (flower box made by Nippon Paper Crecia Co., Ltd.) 3 times and wear it (projection of bottom surface) The surface of a sheet (100 mm × 100 mm × 2 mmt) formed in the same manner as in (2) above was reciprocated 200 times at a load of 9.8 N, a stroke of 50 mm, and a speed of 3000 mm / min. Using the method described in Z 8722, CM-5 manufactured by Konica Minolta Japan Co., Ltd. is used, and the L ^* of the wound surface is measured by the D65 / 10 ° light source reflection method, and the L ^* change rate before and after the wear test is evaluated. did. It shows that it is excellent in scratch resistance, so that this value is small.

(4) Comprehensive Judgment When the Charpy impact strength is 10 kJ / m ² or more, ΔE ^* after the light resistance test is less than 1.2, and L ^* change rate before and after the wear resistance test is 200 or less. .

[raw materials]
<Polycarbonate resin material>
D7340R: Isosorbide polycarbonate (ISB / CHDM = 70/30 (molar ratio)), manufactured by Mitsubishi Chemical Corporation.
D5360R: Isosorbide polycarbonate (ISB / CHDM = 50/50 (molar ratio)), manufactured by Mitsubishi Chemical Corporation.

<BA-MA-S rubber>
M-590: butyl acrylate-methyl methacrylate-styrene rubber, manufactured by Kaneka Corporation.
<(A) component>
BHT: Dibutylhydroxytoluene, manufactured by API Corporation.
<(B) component>
-KF54-HV: Silicone oil (diphenyl dimethicone), manufactured by Shin-Etsu Chemical Co., Ltd., refractive index 1.503, kinematic viscosity at 23 ° C. 5000 cSt

<(C) component>
LA-57: HALS (hindered amine light resistance stabilizer) represented by the following formula (3), manufactured by ADEKA Corporation, melting point: 130 ° C.

Tinuvin 770DF: HALS (hindered amine light resistance stabilizer) represented by the following formula (4), manufactured by Ciba Geigy Co., Ltd., melting point: 84 ° C.

<(D) component>
-Seesorb709 ... 2- (2H-benzotriazol-2-yl) -4- (1,1,3,3-tetramethylbutyl) phenol, manufactured by Cypro Kasei Co., Ltd., melting point: 104 ° C.

<(E) component>
AS2112: Tris (2,4-di-t-butylphenyl) phosphite, manufactured by ADEKA Corporation.
<(F) component>
Irganox 1010: Pentaerythritol-tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], manufactured by BASF, molecular weight: 1176.

Example 1
Using the polycarbonate copolymer and BA-MA-S rubber shown in Table 1 (butyl acrylate-methyl methacrylate-styrene rubber), the components (A) to (F) shown in Table 1 were blended, and , Solvent Red 179, Solvent Green 3, and Solvent Blue 97 were mixed so that the L ^* value of the polycarbonate resin composition was 1.0. Then, it pelletized with the rotary cutter using the biaxial extruder. About the obtained polycarbonate resin composition, Charpy impact strength with notch, ΔE ^* after the light resistance test, and L ^* change rate before and after the wear resistance test were measured and evaluated by the above-described methods. The results are shown in Table 1.

(Comparative Example 1)
Using the polycarbonate copolymer pellets shown in Table 1, the same procedure as in Example 1 was conducted, except that each component was blended in the polycarbonate resin composition blend shown in Table 1, and the polycarbonate resin composition was manufactured and evaluated. . The results are shown in Table 1.

(Comparative Example 2)
Using the polycarbonate copolymer pellets shown in Table 1, the same procedure as in Example 1 was conducted, except that each component was blended in the polycarbonate resin composition blend shown in Table 1, and the polycarbonate resin composition was manufactured and evaluated. . The results are shown in Table 1.

(Comparative Example 3)
Using the polycarbonate copolymer pellets shown in Table 1, the same procedure as in Example 1 was conducted, except that each component was blended in the polycarbonate resin composition blend shown in Table 1, and the polycarbonate resin composition was manufactured and evaluated. . The results are shown in Table 1.

Claims (4)

An automotive interior / exterior member comprising a polycarbonate resin composition having a polycarbonate resin and a butyl acrylate-methyl methacrylate-styrene rubber,
A plurality of carbonate copolymers composed of a structural unit derived from a dihydroxy compound represented by the following general formula (1) (structural unit (1)) and a structural unit derived from cyclohexanedimethanol (CHDM unit) and having different copolymerization ratios A molten mixture of
The content ratio of the molar ratio of the structural unit (1) and the CHDM unit in the polycarbonate resin composition is 67/33 to 69/31 (molar ratio),
In the polycarbonate resin composition, 4.0 to 6.0 parts by weight of butyl acrylate-methyl methacrylate-styrene rubber with respect to 100 parts by weight in total of the polycarbonate resin and butyl acrylate-methyl methacrylate-styrene rubber. Contains,
Furthermore, the interior / exterior member for automobiles containing the following components (A) to (F) with respect to a total of 100 parts by weight of the above polycarbonate resin and butyl acrylate-methyl methacrylate-styrene rubber.
Component (A): dibutylhydroxytoluene: 0.001 to 0.015 parts by weight.
Component (B): Diphenyl dimethicone having a kinematic viscosity at 23 ° C. of 4000 to 5500 cSt: 0.05 to 0.31 parts by weight.
Component (C): hindered amine light stabilizer having a melting point of 125 ° C. to 130 ° C .: 0.05 to 0.21 parts by weight.
Component (D): Benzotriazole light stabilizer having a melting point of 102 ° C. to 106 ° C .: 0.05 to 0.31 part by weight.
Component (E): Tris (2,4-di-t-butylphenyl) phosphite: 0.049 to 0.051 part by weight.
Component (F): hindered phenol antioxidant having a molecular weight of 1100 to 1200: 0.09 to 0.11 parts by weight.

  The interior / exterior member for automobiles according to claim 1, comprising diphenyldimethicone having a refractive index of the component (B) of 1.49 to 1.51.   The automotive interior / exterior member according to claim 1, wherein the component (C) is a hindered amine light-resistant stabilizer having a plurality of piperidine structures.   The interior / exterior member for automobiles according to claim 3, wherein the plurality of piperidine structures of the hindered amine light-resistant stabilizer of component (C) are linked to one alkane chain by an ester bond.