Resin composition

Abstract

Provided is a resin composition containing (A) a polycarbonate resin, (B) an acrylic resin, and (C) a carbodiimide, the resin composition having excellent transparency, heat resistance, impact resistance, weather resistance, surface hardness, wet heat resistance, and dry heat resistance.

Description

Technical Field

[0001] The present invention relates to a resin composition containing a polycarbonate resin, an acrylic resin, and a carbodiimide.

[0002] This patent application for invention is a divisional application filed for the application with the filing date of October 2, 2020, application number 202080070756.7, and invention title "Resin Composition". Background Art

[0003] So far, as transparent resins, methacrylic resins, polycarbonate resins (hereinafter also referred to as PC), etc. are known, and they are used in a wide range of fields such as electrical and electronic parts, optical parts, automotive parts, and mechanical parts in the form of molded products, films, sheets, etc.

[0004] Methacrylic resins such as polymethyl methacrylate (hereinafter sometimes referred to as PMMA) have high transparency and high surface hardness (pencil hardness H to 3H), and are widely used as optical materials such as lenses and optical fibers. However, its glass transition temperature is as low as about 100 °C, and its heat resistance is poor. Therefore, its use in fields with heat resistance is limited. Furthermore, there is also the problem of low impact resistance.

[0005] The polycarbonate resin formed from bisphenol A is excellent in heat resistance, impact resistance, flame retardancy, and transparency, and is therefore widely used in vehicle applications, building materials, etc. In these applications, especially for outdoor use, high weather resistance is required. However, generally, the weather resistance of polycarbonate resins is not excellent compared to other transparent materials such as acrylic resins, and yellowing and clouding occur due to outdoor exposure. In addition, there is also the problem that the surface is very soft (pencil hardness 4B to 2B) and easily scratched.

[0006] It is known that a mixture of PC and PMMA is essentially incompatible and produces an opaque material. For example, Patent Document 1 shows that a mixture of PC and PMMA is opaque and does not exhibit the physical properties of the two polymers.

[0007] To solve these problems, so far, a resin composition of an acrylic resin using a polycarbonate with a special structure (Patent Document 2) has been reported, which can achieve both excellent properties of PC and PMMA. However, according to the research of the present inventors, it has been found that the resin in the resin composition described in Patent Document 2 deteriorates significantly in a humid heat environment and a dry heat environment. Therefore, in the composition of polycarbonate and acrylic resin, there has been no report of a composition with good resistance to humid heat and dry heat while taking into account the characteristics of each resin.

[0008] Prior Art Documents

[0009] Patent Documents

[0010] Patent Document 1: Specification of U.S. Patent No. 4,319,003

[0011] Patent Document 2: Japanese Unexamined Patent Application Publication No. 2015-232091 Summary of the Invention

[0012] An object of the present invention is to provide a resin composition having excellent properties of transparency, heat resistance, impact resistance, weather resistance, surface hardness, moisture and heat resistance, and dry heat resistance.

[0013] The inventors of the present invention have repeatedly and intensively conducted research, and as a result, it has been found that by making a composition of a polycarbonate resin and an acrylic resin contain carbodiimide, a resin composition having excellent properties of transparency, heat resistance, impact resistance, weather resistance, surface hardness, moisture and heat resistance, and dry heat resistance can be obtained, and finally the present invention has been completed.

[0014] That is, according to the present invention, the problems of the invention can be achieved as follows.

[0015] 1. A resin composition comprising (A) a polycarbonate resin, (B) an acrylic resin, and (C) carbodiimide.

[0016] 2. The resin composition according to the preceding item 1, wherein the (A) polycarbonate resin contains 5 to 85 mol% of the repeating unit (a-1) represented by the following formula (1) in all repeating units.

[0017]

[0018] (In the formula, W represents an alkylene group having 1 to 20 carbon atoms or a cycloalkylene group having 6 to 20 carbon atoms, R 1 represents a branched or straight-chain alkyl group having 1 to 20 carbon atoms or a cycloalkyl group having 6 to 20 carbon atoms which may have a substituent, and m represents an integer of 0 to 10.)

[0019] 3. The resin composition according to the preceding item 1 or 2, wherein the (A) polycarbonate resin contains 15 to 95 mol% of the repeating unit (a-2) represented by the following formula (2) in all repeating units.

[0020]

[0021] (In the formula, R 2 represents a hydrogen atom or a methyl group, and R 3 represents a branched or straight-chain alkyl group having 1 to 20 carbon atoms or a cycloalkyl group having 6 to 20 carbon atoms which may have a substituent.)

[0022] 4. The resin composition according to any one of the preceding items 1 to 3, wherein the (B) acrylic resin contains 10 to 100 mol% of the repeating unit (b) represented by the following formula (3) in all repeating units.

[0023]

[0024] 5. The resin composition according to item 4 above, wherein the repeating unit (b) is a unit (b) derived from methyl methacrylate and / or methyl acrylate.

[0025] 6. The resin composition according to any one of the preceding items 1 to 5, wherein the weight ratio of the (A) polycarbonate resin to the (B) acrylic resin is 1:99 to 99:1.

[0026] 7. The resin composition according to any one of the preceding items 1 to 6, wherein the content of the (C) carbodiimide is 0.001 to 20 parts by weight with respect to a total of 100 parts by weight of the polycarbonate resin and the acrylic resin.

[0027] 8. The resin composition according to any one of the preceding items 1 to 7, wherein the molecular weight of the (C) carbodiimide is 150 to 13000.

[0028] 9. The resin composition according to any one of the preceding items 1 to 8, wherein the haze of a 2 mm-thick test piece is 30% or less.

[0029] 10. A molded article obtained by injection molding the resin composition according to any one of the preceding items 1 to 9.

[0030] 11. A film or sheet formed from the resin composition according to any one of the preceding items 1 to 9.

[0031] In the present invention, by making the composition of the polycarbonate resin and the acrylic resin contain carbodiimide, a resin composition having excellent properties such as transparency, heat resistance, impact resistance, weather resistance, surface hardness, heat and humidity resistance, and dry heat resistance can be provided. Therefore, the industrial effect exerted is extremely remarkable. Detailed Description of the Invention

[0032] Hereinafter, the present invention will be described in detail.

[0033] [(A) Polycarbonate Resin]

[0034] The structure of the polycarbonate resin used in the resin composition of the present invention is not particularly limited as long as it has a carbonate bond.

[0035] Among polycarbonate resins, a polycarbonate resin in which the repeating unit preferably contains unit (a-1) represented by the following formula (1) and / or unit (a-2) represented by the following formula (2) is preferred.

[0036]

[0037] (In the formula, W represents an alkylene group having 1 to 20 carbon atoms or a cycloalkylene group having 6 to 20 carbon atoms, R 1 represents a branched or straight-chain alkyl group having 1 to 20 carbon atoms or a cycloalkyl group having 6 to 20 carbon atoms which may have a substituent, and m represents an integer of 0 to 10.)

[0038]

[0039] Unit (a-1) represented by the above formula (1) is derived from a diol having a spiro ring structure. As such a diol compound having a spiro ring structure, there may be mentioned alicyclic diol compounds such as 3,9-bis(2-hydroxyethyl)-2,4,8,10-tetraoxaspiro[5.5]undecane, 3,9-bis(2-hydroxy-1,1-dimethylethyl)-2,4,8,10-tetraoxaspiro[5.5]undecane, 3,9-bis(2-hydroxy-1,1-diethylethyl)-2,4,8,10-tetraoxaspiro[5.5]undecane, 3,9-bis(2-hydroxy-1,1-dipropylethyl)-2,4,8,10-tetraoxaspiro[5.5]undecane.

[0040] It is preferred to use 3,9-bis(2-hydroxy-1,1-dimethylethyl)-2,4,8,10-tetraoxaspiro[5.5]undecane.

[0041] In the polycarbonate resin used in the resin composition of the present invention, it is preferred that the repeating unit contains 5 to 85 mol% of unit (a-1) represented by the above formula (1) in all repeating units, more preferably 10 to 80 mol%, still more preferably 15 to 75 mol%, and particularly preferably 20 to 70 mol%. If unit (a-1) is within the above range, phase separation will not occur during the extrusion or molding of the resin composition with the acrylic resin, and the resin composition will not become cloudy. In addition, crystallization will not occur during the polymerization of the polycarbonate resin, and polymerization is easy, which is preferred.

[0042] In addition, unit (a-2) represented by the above formula (2) is derived from an aliphatic diol having an ether group.

[0043] As unit (a-2), there may be exemplified units (a-2-1), (a-2-2), and (a-2-3) represented by the following formula in a stereoisomeric relationship.

[0044]

[0045] They are ether diols derived from sugars, substances obtained from natural biomass, and are a type of substance known as renewable resources. The repeating units (a-2-1), (a-2-2), and (a-2-3) are respectively called D-isosorbide, isomannitol, and L-isosorbide. D-isosorbide is obtained by hydrogenating D-glucose obtained from starch and then dehydrating it. For other ether diols, except for the starting materials, they can be obtained through the same reaction.

[0046] Among D-isosorbide, isomannitol, and L-isosorbide, in particular, the ease of manufacture and heat resistance of the repeating unit derived from D-isosorbide (1,4; 3,6-dianhydro-D-sorbitol) are excellent, and thus it is preferred.

[0047] Preferably, the repeating unit (a-2) is contained in an amount of 15 to 95 mol% among all the repeating units, more preferably 20 to 90 mol%, still more preferably 30 to 85 mol%, and particularly preferably 40 to 80 mol%. If the unit (a-2) is within the above range, the balance of impact resistance, heat resistance, surface hardness, and weather resistance is excellent, which is preferred.

[0048] In the present invention, as the repeating units of the copolymerization constituent units other than the constituent units (a-1) and (a-2), repeating units derived from various diol compounds can be cited.

[0049] Examples of the aliphatic diol compound include 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1,12-dodecanediol, 2-methyl-1,3-propanediol, neopentyl glycol, 3-methyl-1,5-pentanediol, 2-n-butyl-2-ethyl-1,3-propanediol, 2,2-diethyl-1,3-propanediol, 2,4-diethyl-1,5-pentanediol, 1,2-hexanediol, 1,2-octanediol, 2-ethyl-1,3-hexanediol, 2,3-diisobutyl-1,3-propanediol, 2,2-diisopentyl-1,3-propanediol, 2-methyl-2-propyl-1,3-propanediol, etc. Preferably, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, and 1,12-dodecanediol are used.

[0050] Examples of the alicyclic diol compounds include cyclohexanediols such as 1,2 - cyclohexanediol, 1,3 - cyclohexanediol, 1,4 - cyclohexanediol, 2 - methyl - 1,4 - cyclohexanediol, etc.; cyclohexanedimethanols such as 1,2 - cyclohexanedimethanol, 1,3 - cyclohexanedimethanol, 1,4 - cyclohexanedimethanol, etc.; norbornanedimethanols such as 2,3 - norbornanedimethanol, 2,5 - norbornanedimethanol, etc.; tricyclodecane dimethanol, pentacyclopentadecane dimethanol, 1,3 - adamantanediol, 2,2 - adamantanediol, decalin dimethanol, 2,2,4,4 - tetramethyl - 1,3 - cyclobutanediol, etc. Cyclohexanedimethanols and 2,2,4,4 - tetramethyl - 1,3 - cyclobutanediol are preferably used.

[0051] Examples of the aromatic dihydroxy compounds include α,α'-bis(4 - hydroxyphenyl)-m - diisopropylbenzene (bisphenol M), 9,9 - bis(4 - hydroxy - 3 - methylphenyl)fluorene, 1,1 - bis(4 - hydroxyphenyl)cyclohexane, 1,1 - bis(4 - hydroxyphenyl)-3,3,5 - trimethylcyclohexane, 4,4'-dihydroxy - 3,3'-dimethyldiphenyl sulfide, bisphenol A, 2,2 - bis(4 - hydroxy - 3 - methylphenyl)propane (bisphenol C), 2,2 - bis(4 - hydroxyphenyl)-1,1,1,3,3,3 - hexafluoropropane (bisphenol AF), 1,1 - bis(4 - hydroxyphenyl)decane, etc. 9,9 - bis(4 - hydroxy - 3 - methylphenyl)fluorene and bisphenol A are preferably used.

[0052] The copolymerization constituent units other than these unit (a - 1) and unit (a - 2) are preferably 50 mol% or less, 40 mol% or less, 35 mol% or less, 30 mol% or less, 25 mol% or less, 20 mol% or less, 15 mol% or less, 10 mol% or less in all the repeating units.

[0053] (Method for manufacturing polycarbonate resin)

[0054] The polycarbonate resin can be manufactured by a reaction method known per se for manufacturing polycarbonate resin in general, for example, a method of reacting a diol component with a carbonate precursor such as a carbonic acid diester. Next, the basic methods of these manufacturing methods will be briefly described.

[0055] The transesterification reaction using a carbonic acid diester as the carbonate precursor is carried out by heating and stirring a specified ratio of the diol component and the carbonic acid diester in an inert gas atmosphere and distilling out the generated alcohol or phenolic compound. The reaction temperature varies depending on the boiling point of the generated alcohol or phenolic compound, etc., and is usually in the range of 120 - 300°C. The reaction is carried out under reduced pressure from the initial stage to distill out the generated alcohol or phenolic compound and terminate the reaction. Additionally, a terminal terminator, an antioxidant, etc. can be added as needed.

[0056] As the carbonic acid diester used in the above transesterification reaction, esters of an aryl group, an aralkyl group, etc. having 6 to 12 carbon atoms which may be substituted can be mentioned. Specifically, diphenyl carbonate, dimethylphenyl carbonate, bis(chlorophenyl) carbonate, m-tolyl carbonate, etc. can be exemplified. Among them, diphenyl carbonate is particularly preferable. The usage amount of diphenyl carbonate is preferably 0.97 to 1.10 moles, more preferably 1.00 to 1.06 moles, relative to 1 mole of the total of the dihydroxy compounds.

[0057] In addition, in the melt polymerization method, in order to increase the polymerization rate, a polymerization catalyst can be used. As this polymerization catalyst, an alkali metal compound, an alkaline earth metal compound, a nitrogen-containing compound, a metal compound, etc. can be mentioned.

[0058] As such a compound, an organic acid salt, an inorganic salt, an oxide, a hydroxide, a hydride, an alkoxide, a hydroxy quaternary ammonium salt, etc. of an alkali metal or an alkaline earth metal are preferably used, and these compounds can also be used alone or in combination.

[0059] As the alkali metal compound, sodium hydroxide, potassium hydroxide, cesium hydroxide, lithium hydroxide, sodium hydrogen carbonate, sodium carbonate, potassium carbonate, cesium carbonate, lithium carbonate, sodium acetate, potassium acetate, cesium acetate, lithium acetate, sodium stearate, potassium stearate, cesium stearate, lithium stearate, sodium borohydride, sodium benzoate, potassium benzoate, cesium benzoate, lithium benzoate, disodium hydrogen phosphate, dipotassium hydrogen phosphate, dilithium hydrogen phosphate, disodium phenyl phosphate, disodium salt, dipotassium salt, dicesium salt, dilithium salt of bisphenol A, sodium salt, potassium salt, cesium salt, lithium salt of phenol, etc. can be exemplified.

[0060] As the alkaline earth metal compound, magnesium hydroxide, calcium hydroxide, strontium hydroxide, barium hydroxide, magnesium carbonate, calcium carbonate, strontium carbonate, barium carbonate, magnesium diacetate, calcium diacetate, strontium diacetate, barium diacetate, barium stearate, etc. can be exemplified.

[0061] As the nitrogen-containing compound, hydroxy quaternary ammonium salts having an alkyl group, an aryl group, etc. such as tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide, trimethylbenzylammonium hydroxide can be mentioned. In addition, tertiary amines such as triethylamine, dimethylbenzylamine, triphenylamine, imidazoles such as 2-methylimidazole, 2-phenylimidazole, benzimidazole can be mentioned. In addition, bases or basic salts such as ammonia, tetramethylammonium borohydride, tetrabutylammonium borohydride, tetrabutylammonium tetraphenylborate, tetraphenylammonium tetraphenylborate can be exemplified.

[0062] As the metal compound, zinc-aluminum compounds, germanium compounds, organotin compounds, antimony compounds, manganese compounds, titanium compounds, zirconium compounds, etc. can be exemplified. These compounds can be used singly or two or more kinds can be used in combination.

[0063] The usage amount of these polymerization catalysts is preferably 1×10 relative to 1 mole of the diol component-9 ~1×10 -2 equivalent, preferably 1×10 -8 ~1×10 -5 equivalent, more preferably 1×10 -7 ~1×10 -3 equivalent is selected within the range.

[0064] In addition, a catalyst deactivator can also be added in the later stage of the reaction. As the catalyst deactivator used, a known catalyst deactivator can be effectively used. Among them, an ammonium salt or salt of sulfonic acid is preferred. Further preferred are salts of dodecylbenzenesulfonic acid such as tetrabutyl dodecylbenzenesulfonate, and salts of p-toluenesulfonic acid such as tetrabutylammonium p-toluenesulfonate.

[0065] In addition, as the ester of sulfonic acid, methyl benzenesulfonate, ethyl benzenesulfonate, butyl benzenesulfonate, octyl benzenesulfonate, phenyl benzenesulfonate, methyl p-toluenesulfonate, ethyl p-toluenesulfonate, butyl p-toluenesulfonate, octyl p-toluenesulfonate, phenyl p-toluenesulfonate, etc. are preferably used. Among them, tetrabutyl dodecylbenzenesulfonate is most preferably used.

[0066] Regarding the usage amount of these catalyst deactivators, in the case of using a polymerization catalyst selected from at least 1 kind of alkali metal compound and / or alkaline earth metal compound, relative to 1 mole of the catalyst, it can be used in a proportion preferably of 0.5 to 50 moles, more preferably of 0.5 to 10 moles, and further preferably of 0.8 to 5 moles.

[0067] (Specific viscosity: η SP )

[0068] The specific viscosity (η SP ) of the polycarbonate resin used in the resin composition of the present invention is preferably 0.2 to 1.5. In the range of the specific viscosity of 0.2 to 1.5, the strength and moldability of the molded product are good. More preferably, it is 0.25 to 1.2, further preferably 0.3 to 1.0, and particularly preferably 0.3 to 0.5.

[0069] The specific viscosity referred to in the present invention is obtained by using an Ubbelohde viscometer for a solution obtained by dissolving 0.7 g of polycarbonate resin in 100 ml of dichloromethane at 20°C.

[0070] Specific viscosity (η SP ) = (t - t 0 ) / t 0

[0071] [t 0 is the dropping seconds of dichloromethane, and t is the dropping seconds of the sample solution]

[0072] It should be noted that, as a specific measurement of the specific viscosity, it can be carried out, for example, according to the following procedure. First, the polycarbonate resin is dissolved in dichloromethane at 20 to 30 times its weight. After collecting the soluble components by filtration through diatomaceous earth, the solution is removed and dried thoroughly to obtain a solid of the dichloromethane-soluble components. Using the solution obtained by dissolving 0.7 g of this solid in 100 ml of dichloromethane, the specific viscosity at 20 °C is determined using an Ostwald viscometer.

[0073] [(B) Acrylic resin]

[0074] The structure of the acrylic resin used in the resin composition of the present invention is not particularly limited.

[0075] Among the acrylic resins, an acrylic resin in which the repeating unit contains the unit (b) represented by the following formula (3) is preferred.

[0076]

[0077] (In the formula, R 2 represents a hydrogen atom or a methyl group, and R 3 represents a branched or straight-chain alkyl group having 1 to 20 carbon atoms or a cycloalkyl group having 6 to 20 carbon atoms which may have a substituent.)

[0078] As the monomer from which the unit (b) represented by the above formula (3) is derived, for example, methyl methacrylate, methyl acrylate, benzyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, tert-butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, cyclohexyl (meth)acrylate, norbornenyl (meth)acrylate, dicyclopentenyl (meth)acrylate, dicyclopentyl (meth)acrylate, dicyclopentenyl oxyethyl (meth)acrylate, cyclopentyl methyl acrylate, cyclopentyl acrylate, cyclohexyl methyl acrylate, cyclohexyl acrylate, cycloheptyl methyl acrylate, cycloheptyl acrylate, cyclooctyl methyl acrylate, cyclooctyl acrylate, cyclododecyl methyl acrylate, cyclododecyl acrylate and other compounds can be cited.

[0079] In addition, as the monomers to be used, the following compounds can be cited. For example, methacrylic acid, methyl methacrylate, acrylic acid, lauryl (meth)acrylate, tridecyl (meth)acrylate, stearyl (meth)acrylate, glycidyl (meth)acrylate, hydroxypropyl (meth)acrylate, 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, isobornyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-(methacryloyloxy)ethyl succinate, 2-(methacryloyloxy)ethyl maleate, 2-(methacryloyloxy)ethyl phthalate, 2-(methacryloyloxy)ethyl hexahydrophthalate, pentamethylpiperidyl (meth)acrylate, tetramethylpiperidyl (meth)acrylate, dimethylaminoethyl (meth)acrylate, diethylaminoethyl (meth)acrylate, etc. can be cited.

[0080] They can be used by polymerizing them alone or by polymerizing two or more of them. Among them, as the monomer of the derived unit (b), it is preferably composed of methyl methacrylate and / or methyl acrylate, and particularly preferably composed of methyl methacrylate.

[0081] The acrylic resin of the present invention contains 10 to 100 mol% of the repeating unit (b) in all repeating units, more preferably 10 to 99 mol%, still more preferably 30 to 95 mol%, and particularly preferably 50 to 90 mol%. If the repeating unit (b) is within the above range, the heat resistance to decomposition is excellent, and molding defects such as silver streaks are less likely to occur during molding. In addition, the heat distortion temperature is not likely to decrease. Furthermore, other monomers capable of polymerizing with these acrylic monomers, such as polyolefin monomers and vinyl monomers, can also be used in combination.

[0082] The molecular weight of the above acrylic resin is not particularly limited, and as long as the weight average molecular weight is in the range of 30,000 to 300,000, a composition that does not cause appearance defects such as flow non-uniformity during molding and has excellent mechanical properties and heat resistance can be provided.

[0083] The specific viscosity of the acrylic resin used in the resin composition of the present invention is preferably in the range of 0.12 to 0.55. If the specific viscosity is less than 0.12, the molded product may become brittle. If the specific viscosity is higher than 0.55, the melt viscosity of the resin sometimes becomes high and the moldability decreases.

[0084] In addition, the glass transition temperature (Tg) of the acrylic resin used in the present invention is preferably 90 to 150 °C, more preferably 95 to 145 °C, and still more preferably 100 to 140 °C. If the Tg is 90 to 150 °C, the heat resistance stability and moldability are good, which is preferable.

[0085] The glass transition temperature (Tg) can be measured using a 2910 type DSC manufactured by TA Instruments Japan Co., Ltd. at a heating rate of 20 °C / min.

[0086] The acrylic resin of the present invention is not particularly limited, and an acrylic resin having a melt flow rate of 0.5 to 30 g / 10 min measured at 230 °C and a load of 3.8 kg in accordance with JIS K7210 is preferred. More preferably, the melt flow rate is 0.7 to 27 g / 10 min, and further preferably, the melt flow rate is 1.0 to 25 g / 10 min. The acrylic resin having a melt flow rate in this range has good moldability.

[0087] [(C) Carbodiimide]

[0088] The carbodiimide used in the resin composition of the present invention is not particularly limited as long as it is a compound having a "-N = C = N-" structure in the molecule. Examples of the carbodiimide compound include monocarbon diimide compounds, polycarbon diimide compounds, cyclic carbodiimide compounds, etc., which are generally well-known, and any of them can be used. Examples of the carbodiimide compound include those described in JP-A-9-309871, JP-A-9-249801, JP-A-9-208649, JP-A-9-296097, JP-A-8-81533, JP-A-8-27092, JP-A-9-136869, JP-A-9-124582, JP-A-9-188807, JP-A-2005-82642, JP-A-2005-53870, JP-A-2012-36392, JP-A-2010-163203, JP-A-2011-174094, WO2008 / 072514, WO2010 / 071211, JP-A-2012-81759, JP-A-2012-52014, JP-A-2012-7079, etc.

[0089] The molecular weight of the carbodiimide is preferably 150 or more, more preferably 185 or more, and further preferably 200 or more. If it is in such a range, in addition to improving the moisture resistance, good storage stability can also be obtained. In addition, the molecular weight of the carbodiimide is preferably 13000 or less, more preferably 8000 or less, and further preferably 4000 or less. If it is in such a range, the compatibility of the polycarbonate resin and the acrylic resin is excellent, and the transparency when forming a molded body is excellent, so it is preferred.

[0090] It should be noted that in this specification, when the carbodiimide is a polymer, the molecular weight of the carbodiimide refers to the "weight-average molecular weight". Here, the weight-average molecular weight of the carbodiimide is the weight-average molecular weight in terms of polystyrene determined by gel permeation chromatography (GPC). Specifically, the weight-average molecular weight of the carbodiimide in terms of polystyrene can be measured using LC-9A / RID-6A manufactured by Shimadzu Corporation as the measuring device, ShodeX K-800P / K-804L / K-804L manufactured by Showa Denko K.K. as the column, chloroform or the like as the mobile phase, at a column temperature of 40 °C, and calculated using the calibration curve of standard polystyrene.

[0091] As the carbodiimide, any one of a mono-carbodiimide, a poly-carbodiimide, and a cyclic carbodiimide can be used, and a cyclic carbodiimide and a poly-carbodiimide are more preferable.

[0092] As the poly-carbodiimide, commercially available products can be used. For example, aliphatic poly-carbodiimides (such as "HMV-8CA" and "LA-1" manufactured by Nisshinbo Chemical Inc.) and carbodiimide-modified isocyanates (such as "CARBODILITE V-05" manufactured by Nisshinbo Chemical Inc.) can be mentioned. Among them, aliphatic poly-carbodiimides (such as "HMV-8CA" and "LA-1" manufactured by Nisshinbo Chemical Inc.) are preferable.

[0093] As the cyclic carbodiimide, the cyclic carbodiimide described in Japanese Patent No. 05484356 can be mentioned.

[0094] [Method for manufacturing resin composition]

[0095] The resin composition of the present invention is preferably mixed in a molten state with (A) a polycarbonate resin, (B) an acrylic resin, and (C) a carbodiimide. As a method for mixing in a molten state, an extruder is usually used, and kneading is performed at a molten resin temperature of 200 to 320 °C, preferably 220 to 300 °C, more preferably 230 to 290 °C, and pelletized. Thus, pellets of a resin composition in which two resins are uniformly mixed can be obtained. The configuration of the extruder, the configuration of the screw, etc. are not particularly limited. If the molten resin temperature in the extruder is greater than 320 °C, the resin may be colored or thermally decomposed. On the other hand, if the resin temperature is lower than 200 °C, the resin viscosity is too high, which will overload the extruder.

[0096] [Weight ratio]

[0097] (A) The weight ratio of the polycarbonate resin to (B) the acrylic resin is preferably in the range of 1:99 to 99:1, and they can be arbitrarily mixed within this range. More preferably, it is in the range of 5:95 to 98:2, further preferably in the range of 10:90 to 97:3, particularly preferably in the range of 20:80 to 96:4, and most preferably in the range of 30:70 to 95:5. By being within the above range, a resin composition with excellent heat resistance and impact resistance can be obtained.

[0098] In addition, with respect to a total of 100 parts by weight of the polycarbonate resin and the acrylic resin, (C) carbodiimide is preferably mixed in the range of 0.001 to 20 parts by weight. More preferably, it is in the range of 0.002 to 15 parts by weight, further preferably in the range of 0.005 to 10 parts by weight, particularly preferably in the range of 0.01 to 5 parts by weight, and most preferably in the range of 0.01 to 2 parts by weight.

[0099] [Heat Deflection Temperature: HDT]

[0100] The heat deflection temperature of the resin composition of the present invention under a high load (1.8 MPa) specified by ISO 75 is preferably 90 °C or higher. This heat deflection temperature is more preferably 95 °C or higher, and further preferably 100 °C or higher. If it is within the above range, the thermal deformation in the actual environment is small, and thus it is particularly useful for applications such as electrical and electronic parts, automotive parts, sheets, bottles, containers, building materials, etc. The upper limit is not particularly limited, but it is preferably 150 °C or lower.

[0101] [Pencil Hardness]

[0102] The pencil hardness of the resin composition of the present invention is preferably F or higher. Based on the excellent scratch resistance, it is more preferably H or higher. It should be noted that when the pencil hardness is 4H or lower, it has sufficient functions. The pencil hardness can be made harder by increasing the weight ratio of the acrylic resin. In the present invention, the pencil hardness refers to the hardness at which, when a pencil with a specific pencil hardness is rubbed on the resin of the present invention, no rubbing marks remain even after rubbing, and it is preferably based on the pencil hardness used in the surface hardness test of the coating film that can be measured according to JIS K-5600. The pencil hardness becomes softer in the order of 9H, 8H, 7H, 6H, 5H, 4H, 3H, 2H, H, F, HB, B, 2B, 3B, 4B, 5B, 6B, with 9H being the hardest and 6B being the softest.

[0103] [Additives]

[0104] The resin composition used in the present invention can be blended with additives such as heat stabilizers, plasticizers, light stabilizers, polymerization metal deactivators, flame retardants, lubricants, antistatic agents, surfactants, antibacterial agents, ultraviolet absorbers, mold release agents, and colorants according to the use and requirements.

[0105] (Heat stabilizer)

[0106] In order to suppress the decrease in molecular weight and the deterioration of hue during extrusion and molding, the resin composition used in the present invention particularly preferably contains a heat stabilizer. As the heat stabilizer, a phosphorus-based heat stabilizer, a phenol-based heat stabilizer, and a sulfur-based heat stabilizer can be cited, and these can be used alone or in combination of two or more. As the phosphorus-based stabilizer, it is preferable to compound a phosphite compound. As the phosphite compound, a pentaerythritol type phosphite compound, a phosphite compound that reacts with a diphenol and has a cyclic structure, and a phosphite compound having other structures can be cited.

[0107] As the above-mentioned pentaerythritol type phosphite compound, specifically, for example, distearyl pentaerythritol diphosphite, bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-ethylphenyl)pentaerythritol diphosphite, phenyl bisphenol A pentaerythritol diphosphite, bis(nonylphenyl)pentaerythritol diphosphite, dicyclohexyl pentaerythritol diphosphite, etc. can be cited. Among them, distearyl pentaerythritol diphosphite and bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite are preferably selected.

[0108] As the above-mentioned phosphite compound that reacts with a diphenol and has a cyclic structure, for example, 2,2'-methylenebis(4,6-di-tert-butylphenyl)(2,4-di-tert-butylphenyl) phosphite, 2,2'-methylenebis(4,6-di-tert-butylphenyl)(2-tert-butyl-4-methylphenyl) phosphite, 2,2'-methylenebis(4-methyl-6-tert-butylphenyl)(2-tert-butyl-4-methylphenyl) phosphite, 2,2'-ethylenebis(4-methyl-6-tert-butylphenyl)(2-tert-butyl-4-methylphenyl) phosphite, 2,2'-methylene-bis-(4,6-di-tert-butylphenyl) octyl phosphite, 6-tert-butyl-4-[3-[(2,4,8,10)-tetra-tert-butyl dibenzo[d,f][1,3,2] dioxaphosphorin-6-yl)oxy]propyl]-2-methylphenol, etc. can be cited.

[0109] As the phosphite compound having other structures as described above, for example, triphenyl phosphite, tris(nonylphenyl) phosphite, tridecyl phosphite, trioctyl phosphite, octatriacontyl phosphite, didodecyl monophenyl phosphite, dioctyl monophenyl phosphite, diisopropyl monophenyl phosphite, monobutyl diphenyl phosphite, monodecyl diphenyl phosphite, monooctyl diphenyl phosphite, 2,2-methylenebis(4,6-di-tert-butylphenyl) octyl phosphite, tris(diethylphenyl) phosphite, tris(diisopropylphenyl) phosphite, tris(di-n-butylphenyl) phosphite, tris(2,4-di-tert-butylphenyl) phosphite, tris(2,6-di-tert-butylphenyl) phosphite, etc. can be cited.

[0110] In addition to various phosphite compounds, for example, phosphate compounds, phosphonite compounds, and phosphonate compounds can also be cited.

[0111] As the phosphate compound, tributyl phosphate, trimethyl phosphate, tritolyl phosphate, triphenyl phosphate, trichlorophenyl phosphate, triethyl phosphate, diphenyl tolyl phosphate, diphenyl mono-o-biphenylyl phosphate, tributoxyethyl phosphate, dibutyl phosphate, dioctyl phosphate, diisopropyl phosphate, etc. can be cited, and triphenyl phosphate and trimethyl phosphate are preferred.

[0112] As the phosphonite compound, tetrakis(2,4-di-tert-butylphenyl)-4,4'-biphenylene diphosphonite, tetrakis(2,4-di-tert-butylphenyl)-4,3'-biphenylene diphosphonite, tetrakis(2,4-di-tert-butylphenyl)-3,3'-biphenylene diphosphonite, tetrakis(2,6-di-tert-butylphenyl)-4,4'-biphenylene diphosphonite, tetrakis(2,6-di-tert-butylphenyl)-4,3'-biphenylene diphosphonite, tetrakis(2,6-di-tert-butylphenyl)-3,3'-biphenylene diphosphonite, bis(2,4-di-tert-butylphenyl)-4-phenyl-benzenephosphonite, bis(2,4-di-tert-butylphenyl)-3-phenyl-benzenephosphonite, bis(2,6-di-n-butylphenyl)-3-phenyl-benzenephosphonite, bis(2,6-di-tert-butylphenyl)-4-phenyl-benzenephosphonite, bis(2,6-di-tert-butylphenyl)-3-phenyl-benzenephosphonite, etc. can be cited, and tetrakis(di-tert-butylphenyl)-biphenylene diphosphonite and bis(di-tert-butylphenyl)-phenyl-benzenephosphonite are preferred, and tetrakis(2,4-di-tert-butylphenyl)-biphenylene diphosphonite and bis(2,4-di-tert-butylphenyl)-phenyl-benzenephosphonite are more preferred. The phosphonite compound can be used in combination with the above-mentioned phosphite compound having an aryl group substituted with two or more alkyl groups, which is preferred.

[0113] As the phosphonate compound, dimethyl phenylphosphonate, diethyl phenylphosphonate, dipropyl phenylphosphonate, etc. can be cited.

[0114] Among the above-mentioned phosphorus-based heat stabilizers, tris(nonylphenyl) phosphite, trimethyl phosphate, tris(2,4-di-tert-butylphenyl) phosphite, bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, and bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite can be preferably used.

[0115] The above-mentioned phosphorus-based heat stabilizer can be used alone or in combination of two or more. With respect to 100 parts by weight of the resin composition, the phosphorus-based heat stabilizer is preferably compounded in an amount of 0.001 to 1 part by weight, more preferably 0.01 to 0.5 part by weight, and further preferably 0.01 to 0.3 part by weight.

[0116] In the present invention, the resin composition used is for the purpose of suppressing the decrease in molecular weight and the deterioration of hue during extrusion and molding, and a hindered phenol-based heat stabilizer or a sulfur-based heat stabilizer as a heat stabilizer can be added in combination with the phosphorus-based heat stabilizer.

[0117] As the hindered phenol-based heat stabilizer, for example, as long as it has an antioxidant function, there is no particular limitation. For example, n-octadecyl 3-(4'-hydroxy-3',5'-di-tert-butylphenyl)propionate, tetrakis[methylene-3-(3',5'-di-tert-butyl-4-hydroxyphenyl)propionate]methane, distearyl (4-hydroxy-3-methyl-5-tert-butylbenzyl) malonate, triethylene glycol-bis[3-(3-tert-butyl-5-methyl-4-hydroxyphenyl)propionate], 1,6-hexanediol-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], pentaerythritol-tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2,2'-thiodiethylene bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2,2'-thiobis(4-methyl-6-tert-butylphenol), 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, tris(3,5-di-tert-butyl-4-hydroxybenzyl)-isocyanuric acid ester, 2,4-bis{(octylthio)methyl}o-cresol, isooctyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 2,5,7,8-tetramethyl-2(4',8',12'-trimethyltridecyl)chroman-6-ol, 3,3',3",5,5',5"-hexatert-butyl-a,a',a"-(mesitylene-2,4,6-triyl)trip-cresol, etc. can be cited.

[0118] Among these, octadecyl 3-(4'-hydroxy-3',5'-di-tert-butylphenyl)propionate, pentaerythritol tetra{3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate}, 3,3',3",5,5',5"-hexakis(1,1-dimethylethyl)-α,α',α'-(1,3,5-trimethyl-2,4,6-triyl)tris-p-cresol, 2,2'-thiobis(ethylenenitrilo)bis{3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate}, etc. are preferred.

[0119] These hindered phenol-based heat stabilizers can be used alone or in combination of two or more.

[0120] The hindered phenol-based heat stabilizer is preferably compounded in an amount of 0.001 to 1 part by weight, more preferably 0.01 to 0.5 part by weight, and still more preferably 0.01 to 0.3 part by weight, based on 100 parts by weight of the resin composition.

[0121] Examples of the sulfur-based heat stabilizer include dilauryl 3,3'-thiodipropionate, ditridecyl 3,3'-thiodipropionate, dimyristyl 3,3'-thiodipropionate, distearyl 3,3'-thiodipropionate, lauryl stearyl 3,3'-thiodipropionate, pentaerythritol tetrakis(3-laurylthiopropionate), bis[2-methyl-4-(3-laurylthiopropionyloxy)-5-tert-butylphenyl] sulfide, octadecyl disulfide, mercaptobenzimidazole, 2-mercapto-6-methylbenzimidazole, 1,1'-thiobis(2-naphthol), etc. Among them, pentaerythritol tetrakis(3-laurylthiopropionate) is preferred.

[0122] These sulfur-based heat stabilizers can be used alone or in combination of two or more.

[0123] The sulfur-based heat stabilizer is preferably compounded in an amount of 0.001 to 1 part by weight, more preferably 0.01 to 0.5 part by weight, and still more preferably 0.01 to 0.3 part by weight, based on 100 parts by weight of the resin composition.

[0124] When a phosphite-based heat stabilizer, a phenol-based heat stabilizer, and a sulfur-based heat stabilizer are used in combination, their total amount is preferably compounded in an amount of 0.001 to 1 part by weight, more preferably 0.01 to 0.3 part by weight, based on 100 parts by weight of the resin composition.

[0125] (Release agent)

[0126] In order to further improve the mold release property from the mold during melt molding, within the range not detrimental to the object of the present invention, the resin composition used in the present invention may be compounded with a release agent.

[0127] Examples of the mold release agent include higher fatty acid esters of mono- or polyhydric alcohols, higher fatty acids, paraffin wax, beeswax, olefin waxes, olefin waxes containing a carboxyl group and / or a carboxylic anhydride group, silicone oils, and organopolysiloxanes.

[0128] As the higher fatty acid ester, a partial or full ester of a mono- or polyhydric alcohol having 1 to 20 carbon atoms and a saturated fatty acid having 10 to 30 carbon atoms is preferred. Examples of the partial or full ester of the mono- or polyhydric alcohol and the saturated fatty acid include monoglyceryl stearate, diglyceryl stearate, triglycerin stearate, sorbitan monostearate, stearyl stearate, monoglyceryl behenate, behenyl behenate, pentaerythritol monostearate, pentaerythritol tetrastearate, pentaerythritol tetraisononanoate, propylene glycol monostearate, stearyl stearate, palmitic acid palmitate, butyl stearate, methyl laurate, isopropyl palmitate, biphenyl diphenyl ester, sorbitan monostearate, 2-ethylhexyl stearate, etc.

[0129] Among them, monoglyceryl stearate, triglycerin stearate, pentaerythritol tetrastearate, and behenyl behenate are preferably used.

[0130] As the higher fatty acid, a saturated fatty acid having 10 to 30 carbon atoms is preferred. Examples of the fatty acid include myristic acid, lauric acid, palmitic acid, stearic acid, behenic acid, etc.

[0131] These mold release agents can be used alone or in combination of two or more. The compounding amount of the mold release agent is preferably 0.01 to 5 parts by weight with respect to 100 parts by weight of the resin composition.

[0132] (Ultraviolet absorber)

[0133] The resin composition used in the present invention may contain an ultraviolet absorber. Examples of the ultraviolet absorber include benzotriazole-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, triazine-based ultraviolet absorbers, cyclic imino ester-based ultraviolet absorbers, cyanoacrylate-based ultraviolet absorbers, etc., and benzotriazole-based ultraviolet absorbers are preferred among them.

[0134] As benzotriazole-based ultraviolet absorbers, for example, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-5'-tert-butylphenyl)benzotriazole, 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-amylphenyl)benzotriazole, 2-(2'-hydroxy-3'-dodecyl-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-bis(α,α'-dimethylbenzyl)phenyl)benzotriazole, 2-[2'-hydroxy-3'-(3”,4”,5”,6”-tetraphthalimidomethyl)-5'-methylphenyl]benzotriazole, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 2,2'-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2H-benzotriazol-2-yl)phenol], methyl-3-[3-tert-butyl-5-(2H-benzotriazol-2-yl)-4-hydroxyphenyl]propionate-polyethylene glycol condensate and the like can be cited as benzotriazole-based ultraviolet absorbers.

[0135] The proportion of the ultraviolet absorber is preferably 0.01 to 2 parts by weight, more preferably 0.1 to 1 part by weight, and further preferably 0.2 to 0.5 part by weight based on 100 parts by weight of the resin composition.

[0136] (Light stabilizer)

[0137] The resin composition used in the present invention may contain a light stabilizer. If a light stabilizer is contained, it is good in terms of weather resistance and has the advantage that cracks are not easily generated on the molded product.

[0138] As a light stabilizer, examples include 1,2,2,6,6-pentamethyl-4-piperidyl methacrylate, bis(2,2,6,6-tetramethyl-1-octyloxy-4-piperidyl) didecanoate, bis(1,2,2,6,6-pentamethyl-4-piperidyl)-[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl]butyl malonate, 2,4-bis[N-butyl-N-(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-2-yl)amino]-6-(2-hydroxyethylamine)-1,3,5-triazine, bis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, methyl(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, bis(2,2,6,6-tetramethyl-4-piperidyl) carbonate, bis(2,2,6,6-tetramethyl-4-piperidyl) succinate, bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, 4-octanoyloxy-2,2,6,6-tetramethylpiperidine, bis(2,2,6,6-tetramethyl-4-piperidyl) diphenylmethane-p,p'-dicarboxylate, bis(2,2,6,6-tetramethyl-4-piperidyl) benzene-1,3-disulfonate, bis(2,2,6,6-tetramethyl-4-piperidyl) phenyl phosphite and other hindered amines, bis(octylphenyl) nickel sulfide, nickel complex-3,5-di-tert-butyl-4-hydroxybenzyl phosphoric acid monoethanol salt, nickel dibutyldithiocarbamate and other nickel complexes. These light stabilizers can be used alone or in combination of two or more. Relative to 100 parts by weight of the resin composition, the content of the light stabilizer is preferably 0.001 to 1 part by weight, more preferably 0.01 to 0.5 part by weight.

[0139] (Epoxy stabilizer)

[0140] For the resin composition used in the present invention, in order to improve the hydrolysis resistance, an epoxy compound can be added within the range not damaging the object of the present invention.

[0141] As epoxy stabilizers, there may be mentioned epoxidized soybean oil, epoxidized linseed oil, phenyl glycidyl ether, allyl glycidyl ether, tert-butyl phenyl glycidyl ether, 3,4-epoxycyclohexylmethyl-3',4'-epoxycyclohexanecarboxylate, 3,4-epoxy-6-methylcyclohexylmethyl-3',4'-epoxy-6'-methylcyclohexanecarboxylate, 2,3-epoxycyclohexylmethyl-3',4'-epoxycyclohexanecarboxylate, 4-(3,4-epoxy-5-methylcyclohexyl)butyl-3',4'-epoxycyclohexanecarboxylate, 3,4-epoxycyclohexylethylene oxide, cyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, 3,4-epoxy-6-methylcyclohexylmethyl-6'-methylcyclohexanecarboxylate, bisphenol A diglycidyl ether, tetrabromobisphenol A glycidyl ether, diglycidyl esters of phthalic acid, diglycidyl esters of hexahydrophthalic acid, bis-epoxy dicyclopentadiene ether, bis-epoxy ethylene glycol, bis-epoxy cyclohexyl adipate, butadiene diepoxide, tetraphenylethylene epoxide, octyl epoxy tartrate, epoxidized polybutadiene, 3,4-dimethyl-1,2-epoxycyclohexane, 3,5-dimethyl-1,2-epoxycyclohexane, 3-methyl-5-tert-butyl-1,2-epoxycyclohexane, octadecyl-2,2-dimethyl-3,4-epoxycyclohexanecarboxylate, N-butyl-2,2-dimethyl-3,4-epoxycyclohexanecarboxylate, cyclohexyl-2-methyl-3,4-epoxycyclohexanecarboxylate, N-butyl-2-isopropyl-3,4-epoxy-5-methylcyclohexanecarboxylate, octadecyl-3,4-epoxycyclohexanecarboxylate, 2-ethylhexyl-3',4'-epoxycyclohexanecarboxylate, 4,6-dimethyl-2,3-epoxycyclohexyl-3',4'-epoxycyclohexanecarboxylate, 4,5-epoxytetrahydrophthalic anhydride, 3-tert-butyl-4,5-epoxytetrahydrophthalic anhydride, diethyl-4,5-epoxy-cis-1,2-cyclohexanedicarboxylate, di-n-butyl-3-tert-butyl-4,5-epoxy-cis-1,2-cyclohexanedicarboxylate, etc. Based on aspects such as compatibility, bisphenol A diglycidyl ether is preferred.

[0142] Such epoxy stabilizers are desirably incorporated in an amount in the range of preferably 0.0001 to 5 parts by weight, more preferably 0.001 to 1 part by weight, and still more preferably 0.005 to 0.5 part by weight, based on 100 parts by weight of the resin composition.

[0143] (Blueing agent)

[0144] In order to eliminate the yellow color of the lens due to the polymer and the ultraviolet absorber, the resin composition used in the present invention may be incorporated with a blueing agent. As the blueing agent, any blueing agent that can be used in polycarbonate can be used without any problem. Generally, anthraquinone dyes are easily available and are preferred.

[0145] As specific blueing agents, for example, as representative examples, the common names Solvent Violet13 [CA.No (Color Index Number) 60725], Solvent Violet31 [CA.No 68210], Solvent Violet33 [CA.No 60725], Solvent Blue94 [CA.No 61500], Solvent Violet36 [CA.No 68210], Solvent Blue97 ["Macrolex Violet RR" manufactured by Bayer Corporation], and Solvent Blue45 [CA.No 61110] can be cited.

[0146] These blueing agents can be used alone, or two or more of them can be used in combination. With respect to 100 parts by weight of the resin composition, these blueing agents are preferably blended in a proportion of 0.1×10 -4 ~2×10 -4 parts by weight.

[0147] (Flame retardant)

[0148] A flame retardant can also be blended in the resin composition used in the present invention. As the flame retardant, halogen-based flame retardants such as brominated epoxy resin, brominated polystyrene, brominated polycarbonate, brominated polyacrylate, and chlorinated polyethylene, phosphate-based flame retardants such as monophosphate ester compounds and phosphate ester oligomer compounds, organic phosphorus-based flame retardants other than phosphinate ester compounds, phosphonate ester compounds, phosphazene oligomer compounds, and phosphoric acid amide compounds, organic metal salt-based flame retardants such as organic sulfonic acid alkali metal (alkaline earth metal) salts, boric acid metal salt-based flame retardants, and tin acid metal salt-based flame retardants, as well as silicone-based flame retardants, ammonium polyphosphate-based flame retardants, triazine-based flame retardants, etc. can be cited. In addition, a flame retardant aid (for example, sodium antimonate, antimony trioxide, etc.), a drip-proof agent (polytetrafluoroethylene having fibril-forming ability, etc.) can be additionally blended and used in combination with the flame retardant.

[0149] Among the above-mentioned flame retardants, compounds that do not contain chlorine atoms and bromine atoms can reduce the non-preferred factors during incineration waste disposal and heat recovery. Therefore, as the flame retardant in the molded product of the present invention having this characteristic of reducing the environmental load, it is more preferred.

[0150] When a flame retardant is blended, with respect to 100 parts by weight of the resin composition, it is preferably in the range of 0.05 to 50 parts by weight. If it is within the above range, sufficient flame retardancy is exhibited, and the strength, heat resistance, etc. of the molded product are excellent.

[0151] (Elastomeric polymer)

[0152] The resin composition used in the present invention may use an elastic polymer as an impact modifier. Examples of the elastic polymer include graft copolymers obtained by copolymerizing one or more monomers selected from aromatic vinyl, vinyl cyanide, acrylate, methacrylate, and vinyl compounds copolymerizable therewith in a natural rubber or a rubber component having a glass transition temperature of 10°C or lower. A more preferred elastic polymer is a core-shell type graft copolymer obtained by graft copolymerizing one or more of the above monomers in a shell on a core of a rubber component.

[0153] In addition, block copolymers of the rubber component and the above monomers may also be mentioned. Specific examples of the block copolymer include thermoplastic elastomers such as styrene·ethylene propylene·styrene elastomer (hydrogenated styrene·isoprene·styrene elastomer) and hydrogenated styrene·butadiene·styrene elastomer. Furthermore, various elastic polymers known as other thermoplastic elastomers, such as polyurethane elastomer, polyester elastomer, and polyetheramide elastomer, may also be used.

[0154] As the impact modifier, a core-shell type graft copolymer is more preferred. In the core-shell type graft copolymer, the particle size of the core is preferably 0.05 to 0.8 μm, more preferably 0.1 to 0.6 μm, and further preferably 0.1 to 0.5 μm in terms of weight average particle size. If it is in the range of 0.05 to 0.8 μm, better impact resistance can be achieved. The elastic polymer contains 40% or more of a rubber component, and more preferably contains 60% or more.

[0155] Examples of the rubber component include butadiene rubber, butadiene-acrylic composite rubber, acrylic rubber, acrylic-silicone composite rubber, isobutene-silicone composite rubber, isoprene rubber, styrene-butadiene rubber, chloroprene rubber, ethylene-propylene rubber, nitrile rubber, ethylene-acrylic rubber, silicone rubber, epichlorohydrin rubber, fluororubber, and rubbers obtained by hydrogenating the unsaturated bond portions thereof. From the viewpoint of concerns about the generation of harmful substances during combustion, rubber components without halogen atoms are preferred in terms of environmental load.

[0156] The glass transition temperature of the rubber component is preferably -10°C or lower, more preferably -30°C or lower. As the rubber component, butadiene rubber, butadiene-acrylic composite rubber, acrylic rubber, and acrylic-silicone composite rubber are particularly preferred. The composite rubber refers to a rubber obtained by copolymerizing two rubber components, or a rubber polymerized in such a way as to obtain an IPN structure that cannot be separated and is mutually entangled.

[0157] Examples of the aromatic vinyl compound in the vinyl compound copolymerized in the rubber component include styrene, α-methylstyrene, p-methylstyrene, alkoxystyrene, and halogenated styrene, with styrene being particularly preferred. Examples of the acrylate include methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, and octyl acrylate, and examples of the methacrylate include methyl methacrylate, ethyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, and octyl methacrylate, with methyl methacrylate being particularly preferred. Among these, it is particularly preferred to contain a methacrylate such as methyl methacrylate as an essential component. More specifically, the methacrylate is preferably contained in an amount of 10% by weight or more (in the case of a core-shell polymer, it means in 100% by weight of the shell) in 100% by weight of the graft component, and more preferably 15% by weight or more.

[0158] The elastic polymer containing a rubber component having a glass transition temperature of 10°C or lower may be an elastic polymer produced by any of bulk polymerization, solution polymerization, suspension polymerization, and emulsion polymerization. The copolymerization method may be one-step grafting or multi-step grafting. In addition, it may also be a mixture with a copolymer of only the graft component generated as a by-product during production. Further, as the polymerization method, in addition to the usual emulsion polymerization method, a soap-free polymerization method using an initiator such as potassium persulfate, a seed polymerization method, a two-step swelling polymerization method, etc. can be cited. In addition, it can be carried out by the following methods: in the suspension polymerization method, keeping the aqueous phase and the monomer phase separately and accurately supplying the two to a continuous disperser, and controlling the particle size by the rotation speed of the disperser; and in the continuous production method, in an aqueous liquid having a dispersing ability, passing the monomer phase through a fine-diameter orifice or a porous filter with a diameter of several μm to several tens of μm, and then supplying and controlling the particle size, etc. In the case of a core-shell graft polymer, the reaction can be carried out simultaneously for the core and the shell, and can be one-step or multi-step.

[0159] The elastic polymer is commercially available and can be easily obtained. For example, as the rubber component, elastic polymers mainly composed of butadiene rubber, acrylic rubber or butadiene-acrylic composite rubber include Kane Ace B series (such as B-56, etc.) of Kaneka Corporation, Metablen C series (such as C-223A, etc.), W series (such as W-450A, etc.) of MITSUBISHI RAYON CO., LTD., Pararoid EXL series (such as EXL-2602, etc.), HIA series (such as HIA-15, etc.), BTA series (such as BTA-III, etc.), KCA series of Kureha Chemical Industry Co., Ltd., Pararoid EXL series, KM series (such as KM-336P, KM-357P, etc.) of Rohm&Haas Company, and UCL Modify Fire Resin series (UMG AXS resin series of UMG ABS Co., Ltd.) of Ube Saikon Co., Ltd., etc. As the rubber component, elastic polymers mainly composed of acrylic-silicone composite rubber include elastic polymers commercially available under the trade names of Metablen S-2001 or SRK-200 from MITSUBISHI RAYON CO., LTD.

[0160] With respect to 100 parts by weight of the resin composition, the composition ratio of the impact modifier is 0.2 to 50 parts by weight, more preferably 1 to 30 parts by weight, and even more preferably 1.5 to 20 parts by weight. This composition range can suppress the reduction of rigidity and impart good impact resistance to the composition.

[0161] [Molded article]

[0162] The resin composition of the present invention can be molded and processed by any method such as injection molding method, compression molding method, injection compression molding method, melt film forming method, casting method, etc., and can be used as optical lenses, optical discs, optical films, placement substrates (Placer substrates), optical cards, liquid crystal panels, headlight lenses, light guide plates, diffusion plates, protective films, OPC adhesives, front panels, frames, trays, water tanks, lighting covers, signboards, resin windows. In particular, it can be used as components that require high surface hardness such as front panels, frames, trays, water tanks, lighting covers, signboards, resin windows, etc.

[0163] [Transparency]

[0164] The haze of the 2-mm thick molded sheet of the resin composition of the present invention is preferably 30% or less, more preferably 20% or less, still more preferably 10% or less, particularly preferably 5% or less, and most preferably 2% or less. If the haze is within the above range, there is no limitation on the scope of use as various transparent members, which is preferred.

[0165] [Impact strength]

[0166] The notched Charpy impact strength of the resin composition of the present invention measured according to ISO179 is 1.5 kJ / M 2 or more, more preferably 2.0 kJ / M 2 or more, still more preferably 3.0 kJ / M 2 or more. It should be noted that the notched Charpy impact strength has sufficient functions when it is 100 kJ / M 2 or less.

[0167] [Surface treatment]

[0168] For the molded article formed of the resin composition of the present invention, various surface treatments can be performed. The surface treatment referred to herein means treatments such as vapor deposition (physical vapor deposition, chemical vapor deposition, etc.), plating (electroplating, electroless plating, melt plating, etc.), painting, coating, printing, etc. for forming a new layer on the surface layer of the resin molded article, and the methods commonly used can be applied. Specifically, as the surface treatment, various surface treatments such as hard coating, waterproof and oil-proof coating, ultraviolet absorption coating, infrared absorption coating, and metallization (vapor deposition, etc.) can be exemplified. Hard coating is a particularly preferred and essential surface treatment.

[0169] Examples

[0170] Hereinafter, the present invention will be described in detail according to examples, but the present invention is not limited thereto. It should be noted that "parts" in the examples mean "parts by weight". The resins used and the evaluation methods in the examples are as described below.

[0171] (Evaluation of polycarbonate resin)

[0172] 1. Polymer composition ratio (NMR)

[0173] The proton NMR of JNM-AL400 manufactured by JEOL Ltd. was used to measure each repeating unit, and the polymer composition ratio (molar ratio) was calculated.

[0174] 2. Specific viscosity

[0175] Using a solution obtained by dissolving 0.7 g of polycarbonate resin in 100 ml of dichloromethane at 20°C, it was determined using an Ostwald viscometer.

[0176] Specific viscosity (η SP)=(t - t 0 ) / t 0

[0177] [t 0 is the number of seconds for dichloromethane to fall, and t is the number of seconds for the test solution to fall

[0178] (Evaluation of the resin composition)

[0179] 3. Notched Charpy impact strength

[0180] After drying the pellets at 80 - 110 °C for 12 hours, using JSW J - 75EIII manufactured by Japan Steel Works, Ltd., at a barrel temperature of 230 - 280 °C and a mold temperature of 80 - 90 °C, the flexural test pieces were molded. The notched Charpy impact test was measured according to ISO179.

[0181] 4. Heat deflection temperature under load (1.8 MPa)

[0182] Using the flexural test pieces prepared in the above 3., the heat deflection temperature under load (1.8 MPa) specified in ISO75 was measured.

[0183] 5. Haze

[0184] After drying the pellets of the polycarbonate resin composition at 80 - 110 °C for 12 hours, using an injection molding machine (JSW J - 75EIII manufactured by Japan Steel Works, Ltd.), at a molding temperature of 240 - 280 °C, a mold temperature of 80 °C, and a molding cycle of 50 seconds, a three - stage plate with a width of 50 mm, a length of 90 mm, a thickness of 3.0 mm (length 20 mm), 2.0 mm (length 45 mm), 1.0 mm (length 25 mm) from the gate side, and an arithmetic mean roughness (Ra) of 0.03 μm was molded. For the 2 - mm - thick part of the molded three - stage plate, it was measured using a haze meter 300A manufactured by Nippon Denshoku Industries Co., Ltd.

[0185] 6. Pencil hardness

[0186] Using the prepared three - stage plate, based on JIS K5400, in a constant - temperature chamber at an ambient temperature of 23 °C, for the surface of the composition, a line was drawn with the pencil held at an angle of 45 degrees and a load of 750 g applied, and the surface condition was visually evaluated.

[0187] 7. Weathering discoloration

[0188] According to JIS B7753, using the Sunshine Weather Ometer S80 manufactured by Suga Test Instruments Co., Ltd., with a sunlight carbon arc (4 pairs of extra-long life carbon) light source, set to a discharge voltage of 50V and a discharge current of 60A, under the conditions of irradiation and surface spraying (rainfall), a black panel temperature of 63°C and a relative humidity of 50%, a 500-hour irradiation treatment was carried out on the square surface of the flat plate (width 60mm × length 60mm × thickness 3mm) of the injection-molded sheet. The surface spraying (rainfall) time was set to 12 minutes / 1 hour. A type A glass filter was used. For the test pieces before and after this test, a spectrophotometric color difference meter SE-2000 manufactured by Nippon Denshoku Industries Co., Ltd. was used to measure the color difference ΔE.

[0189] The smaller the ΔE, the smaller the color change.

[0190] 8. Dry heat resistance test

[0191] Cut the 2mm part of the fabricated 3-section plate into a size of 50mm × 45mm. For this molded plate, it was statically treated for 500 hours at 110°C without performing a decompression operation using a Vacuum oven VOS-301SD manufactured by Tokyo Rikakikai Co., Ltd. For the treated samples, using the measurement method in 2., the specific viscosity was measured, and Δη before and after the treatment was calculated. SP 。

[0192] In this evaluation, Δη SP The smaller the value, the smaller the change in molecular weight during long-term use in a high-temperature and dry environment, indicating more excellent dry heat resistance.

[0193] In addition, for the change in YI (ΔYI) before and after the treatment, according to JIS K7136 (2000), a colorimetric color difference meter "CE-7000" manufactured by Macbeth was used to measure the YI of the injection-molded plate with a C light source.

[0194] In this evaluation, the smaller the ΔYI value, the smaller the change in hue during long-term use in a high-temperature and dry environment, indicating more excellent dry heat resistance.

[0195] 9. Damp heat resistance test

[0196] Cut the 2mm part of the fabricated 3-section plate into a size of 50mm × 45mm. For this molded plate, a small environmental test chamber SH-241 manufactured by ESPEC CO., LTD. was used to carry out a 500-hour static treatment at 85°C and 85% RH. For the treated samples, using the measurement method in 2., the specific viscosity was measured, and Δη before and after the treatment was calculated. SP 。

[0197] In this evaluation, Δη SP The smaller the value, the smaller the change in molecular weight during long-term use in a high-temperature and high-humidity environment, indicating more excellent moisture and heat resistance.

[0198] [Polycarbonate resin]

[0199] PC1 (Example):

[0200] Structural unit from D-isosorbide (hereinafter ISS) / structural unit from 3,9-bis(2-hydroxy-1,1-dimethylethyl)-2,4,8,10-tetraoxaspiro[5.5]undecane (hereinafter SPG) / structural unit from 1,9-nonanediol (hereinafter ND) = 75 / 20 / 5 (mol%), specific viscosity 0.396

[0201] PC2 (Example):

[0202] Structural unit from 9,9-bis(4-hydroxy-3-methylphenyl)fluorene (hereinafter BCF) / structural unit from SPG = 34 / 66 (mol%), specific viscosity 0.359

[0203] PC3 (Example):

[0204] Structural unit from bisphenol A / structural unit from SPG = 85 / 15 (mol%), specific viscosity 0.385

[0205] PC4 (Comparative Example):

[0206] Panlite L-1225 manufactured by Teijin Limited

[0207] PC5 (Comparative Example):

[0208] Structural unit from ISS / structural unit from 1,4-cyclohexanedimethanol (hereinafter CHDM) = 70 / 30, specific viscosity 0.378

[0209] PC6 (Example, Comparative Example):

[0210] Structural unit from ISS / structural unit from CHDM = 50 / 50 (mol%), specific viscosity 0.337

[0211] [Acrylic resin]

[0212] PMMA (Example)

[0213] Acrypet VH-001 manufactured by MITSUBISHI RAYON CO., LTD. (acrylic resin obtained by copolymerizing 95 mol% of methyl methacrylate and 5 mol% of methyl acrylate)

[0214] [Carbodiimide]

[0215] C1 (Example):

[0216] Aliphatic polycarbodiimide HMV-8CA manufactured by Nisshinbo Industries, Inc., molecular weight 3000

[0217] C2 (Example):

[0218] Cyclic carbodiimide (refer to the following structure), molecular weight 516, produced by the same synthesis method as Example 2 described in Japanese Patent No. 5484356.

[0219]

[0220] [Example 1]

[0221] <Manufacture of Polycarbonate Resin>

[0222] 354 parts of D-isosorbide (hereinafter simply referred to as ISS), 263 parts of 3,9-bis(2-hydroxy-1,1-dimethylethyl)-2,4,8,10-tetraoxaspiro[5.5]undecane (hereinafter simply referred to as SPG), 28 parts of 1,9-nonanediol (hereinafter simply referred to as ND), 750 parts of diphenyl carbonate (hereinafter simply referred to as DPC), and 0.8×10 -2 parts of tetramethylammonium hydroxide as a catalyst and 0.6×10 -4 parts of barium stearate were heated and melted at 200°C in a nitrogen atmosphere. Subsequently, the temperature was raised to 220°C over 30 minutes, and the degree of vacuum was adjusted to 20.0 kPa. Subsequently, the temperature was further raised to 240°C over 30 minutes, and the degree of vacuum was adjusted to 10 kPa. After maintaining at this temperature for 10 minutes, the degree of vacuum was made 133 Pa or less over 1 hour. After the reaction was completed, it was discharged from the bottom of the reaction tank under nitrogen pressure, cooled in a water bath, and cut with a pelletizer to obtain pellets (PC1). Various evaluations were performed on the obtained pellets. The evaluation results are shown in Table 1.

[0223] <Manufacture of Resin Composition>

[0224] Use polycarbonate resin PC1 and acrylic resin PMMA1: Acrypet VH-001 (copolymerized acrylic resin of methyl methacrylate and methyl acrylate) manufactured by MITSUBISHI RAYON CO., LTD. After drying each resin at 80 °C for more than 12 hours, they were mixed in a weight ratio of 70:30. Then, 0.01 parts by weight of carbodiimide C1 was added relative to 100 parts by weight of the resin. Thereafter, using an exhaust-type twin-screw extruder [KZW15-25MG manufactured by Technobel Co., Ltd.], melt-kneading was carried out at 240 °C for both the barrel and the die, and mixed pellets of acrylic resin and polycarbonate resin were obtained. After drying a part of the obtained pellets at 90 °C for more than 12 hours, a test piece for various evaluations was molded using an injection molding machine. The evaluation results are shown in Table 1.

[0225] [Example 2]

[0226] <Manufacture of resin composition>

[0227] 0.2 parts by weight of carbodiimide C1 was added relative to 100 parts by weight of the resin. Except for this, exactly the same operations as in Example 1 were carried out, and the same evaluations were made. The results are recorded in Table 1.

[0228] [Example 3]

[0229] <Manufacture of resin composition>

[0230] The mixing weight ratio was set to PC1:PMMA1 = 50 / 50, and 0.2 parts by weight of carbodiimide C1 was added relative to 100 parts by weight of the resin. Except for this, exactly the same operations as in Example 1 were carried out, and the same evaluations were made. The results are recorded in Table 1.

[0231] [Example 4]

[0232] 0.5 parts by weight of carbodiimide C1 was added relative to 100 parts by weight of the resin. Except for this, exactly the same operations as in Example 1 were carried out, and the same evaluations were made. The results are recorded in Table 1.

[0233] [Example 5]

[0234] 0.5 parts by weight of carbodiimide C2 was added relative to 100 parts by weight of the resin. Except for this, exactly the same operations as in Example 1 were carried out, and the same evaluations were made. The results are recorded in Table 1.

[0235] [Example 6]

[0236] With respect to 100 parts by weight of the resin, 1.5 parts by weight of carbodiimide C2 was added. Except for this, the same operations as in Example 1 were carried out, and the same evaluations were made. The results are shown in Table 1.

[0237] [Example 7]

[0238] <Manufacture of polycarbonate resin>

[0239] 445 parts of 9,9-bis(4-hydroxy-3-methylphenyl)fluorene (hereinafter abbreviated as BCF), 695 parts of SPG, 750 parts of DPC, and 0.6×10 -4 parts of sodium bicarbonate as a catalyst were heated and melted at 200°C in a nitrogen atmosphere. Thereafter, the temperature was raised to 240°C over 30 minutes, and the degree of vacuum was adjusted to 20.0 kPa. Thereafter, the temperature was further raised to 270°C over 30 minutes, and the degree of vacuum was adjusted to 10 kPa. After holding at this temperature for 10 minutes, the degree of vacuum was made 133 Pa or less over 1 hour. After the reaction was completed, it was discharged from the bottom of the reaction tank under nitrogen pressure, cooled in a water tank, and cut with a pelletizer to obtain pellets (PC2). Various evaluations were made on the obtained pellets. The evaluation results are shown in Table 1.

[0240] <Manufacture of resin composition>

[0241] Using polycarbonate resin PC2 and acrylic resin PMMA1: Acrypet VH-001 (copolymerized acrylic resin of methyl methacrylate and methyl acrylate) manufactured by MITSUBISHI RAYON CO., LTD., after drying each resin at 90°C for 12 hours or more, they were mixed at a weight ratio of 70:30. Then, 0.2 parts by weight of carbodiimide C1 was added with respect to 100 parts by weight of the resin. Thereafter, using an exhaust-type twin-screw extruder [KZW15-25MG manufactured by Technobel Co., Ltd.], melt-kneading was carried out at 270°C for both the barrel and the die head to obtain mixed pellets of the acrylic resin and the polycarbonate resin. After drying a part of the obtained pellets at 90°C for 12 hours or more, test pieces for various evaluations were molded using an injection molding machine. The evaluation results are shown in Table 1.

[0242] [Example 8]

[0243] 672 parts of bisphenol A (hereinafter abbreviated as BPA), 158 parts of SPG, 750 parts of DPC, and 0.6×10 -4It was heated and melted at 200 °C in a nitrogen atmosphere. Thereafter, the temperature was raised to 240 °C over 30 minutes, and the degree of reduced pressure was adjusted to 20.0 kPa. Thereafter, the temperature was further raised to 280 °C over 30 minutes, and the degree of reduced pressure was adjusted to 10 kPa. After holding at this temperature for 10 minutes, the degree of reduced pressure was made 133 Pa or less over 1 hour. After the reaction was completed, it was discharged from the bottom of the reaction tank under nitrogen pressure, cooled in a water bath, and cut with a pelletizer to obtain pellets (PC3). Various evaluations were performed on the obtained pellets. The evaluation results are shown in Table 1.

[0244] <Manufacture of Resin Composition>

[0245] Using polycarbonate resin PC3 and acrylic resin PMMA1: Acrypet VH-001 (copolymerized acrylic resin of methyl methacrylate and methyl acrylate) manufactured by MITSUBISHI RAYON CO., LTD., after drying each resin at 90 °C for 12 hours or more, they were mixed in a weight ratio of 70:30. Then, 0.2 parts by weight of carbodiimide C1 was added relative to 100 parts by weight of the resin. Thereafter, using an exhaust-type twin-screw extruder [KZW15-25MG manufactured by Technobel Co., Ltd.], melt-kneading was performed at 280 °C for both the barrel and the die head to obtain mixed pellets of acrylic resin and polycarbonate resin. After drying a part of the obtained pellets at 90 °C for 12 hours or more, test pieces for various evaluations were molded using an injection molding machine. The evaluation results are shown in Table 1.

[0246] [Example 9]

[0247] Using 253 parts of ISS, 250 parts of CHDM, and 750 parts of DPC as raw materials, except for this, the same operations as in Example 1 were performed, and the same evaluations were carried out (PC6). The results are shown in Table 1.

[0248] [Comparative Example 1]

[0249] Carbodiimide C1 was not added. Except for this, the same operations as in Example 1 were performed, and the same evaluations were carried out. The η before and after the damp heat test and the dry heat test SP decreased significantly and was inferior to that of Example 1.

[0250] [Comparative Example 2]

[0251] Carbodiimide C1 was not added. Except for this, the same operations as in Example 7 were performed, and the same evaluations were carried out. The η before and after the damp heat test and the dry heat test SP decreased significantly and was inferior to that of Example 7.

[0252] [Comparative Example 3]

[0253] Carbon diimide C1 was not added. Otherwise, the same operations as in Example 8 were carried out, and the same evaluations were made. The results are shown in Table 1. η before and after the damp heat test and the dry heat test SP decreased significantly and was inferior to that of Example 8.

[0254] [Comparative Example 4]

[0255] Only Panlite L-1225 (PC4) manufactured by Teijin Limited was used, and the extrusion temperature and the molding temperature were set at 280 °C. Otherwise, the same operations as in Example 1 were carried out, and the same evaluations were made. In terms of surface hardness and weather resistance, it was inferior to the examples.

[0256] [Comparative Example 5]

[0257] Only Acrypet VH-001 (copolymerized polyacrylic resin of methyl methacrylate and methyl acrylate) manufactured by MITSUBISHI RAYON CO., LTD. was used, and the extrusion temperature and the molding temperature were set at 250 °C. Otherwise, the same operations as in Example 1 were carried out, and the same evaluations were made. In terms of impact resistance and heat deflection temperature under load, it was inferior to the examples.

[0258] [Comparative Example 6]

[0259] <Manufacture of polycarbonate resin>

[0260] 354 parts of ISS, 150 parts of CHDM, and 750 parts of DPC were used as raw materials, and carbon diimide C1 was not added. Otherwise, the same operations as in Example 1 were carried out, and the same evaluations were made (PC5). The results are shown in Table 1.

[0261] <Manufacture of resin composition>

[0262] The same operations as in Example 1 were carried out for extrusion, but whitened pellets were obtained. The molded body after molding also turned white, and transparency could not be maintained at all.

[0263] [Comparative Example 7]

[0264] Carbon diimide C1 was not added. Otherwise, the same operations as in Example 9 were carried out, and the same evaluations were made. The results are shown in Table 1. Although the transparency of the molded body after molding was maintained, η SP decreased significantly and was inferior to that of Example 9.

[0265]

[0266] Industrial Applicability

[0267] The resin composition of the present invention is useful as components such as optical lenses, optical discs, optical films, placement substrates, optical cards, liquid crystal panels, headlight lenses, light guide plates, diffusion plates, protective films, OPC adhesives, front panels, frames, trays, water tanks, lighting covers, signboards, resin windows, etc.

Claims

1. A resin composition comprising (A) a polycarbonate resin, (B) an acrylic resin, and (C) an aliphatic polycarbodiimide, (A) The polycarbonate resin contains 5 to 85 mol% of the repeating unit (a-1) represented by the following formula (1) in all repeating units, and contains 15 to 95 mol% of the repeating unit (a-2) represented by the following formula (2) in all repeating units. (B) The acrylic resin contains 10 to 100 mol% of the repeating unit (b) represented by the following formula (3) in all repeating units. The repeating unit (b) is a unit (b) derived from methyl methacrylate and / or methyl acrylate. The weight ratio of (A) the polycarbonate resin to (B) the acrylic resin is 1:99 to 99:

1. Based on 100 parts by weight in total of (A) the polycarbonate resin and (B) the acrylic resin, the content of (C) the aliphatic polycarbodiimide is 0.2 to 0.5 parts by weight. In the formula, W represents an alkylene group having 1 to 20 carbon atoms or a cycloalkylene group having 6 to 20 carbon atoms, and R 1 represents a branched or straight-chain alkyl group having 1 to 20 carbon atoms, or a cycloalkyl group having 6 to 20 carbon atoms which may have substituents, and m represents an integer of 0 to 10. In the formula, R 2 represents a hydrogen atom or a methyl group, and R 3 represents a branched or straight-chain alkyl group having 1 to 20 carbon atoms or a cycloalkyl group having 6 to 20 carbon atoms which may have substituents.

2. The resin composition according to claim 1, wherein, (C) The molecular weight of the aliphatic polycarbodiimide is 150 to 13,000.

3. The resin composition according to claim 1, wherein, The haze of a 2-mm-thick test piece is 30% or less.

4. A molded article which is an optical lens, an optical disc, an optical film, a placement substrate, an optical card, a liquid crystal panel, a headlight lens, a light guide plate, a diffusion plate, a protective film, an OPC binder, a front panel, a frame, a tray, a water tank, a lighting cover, a display board, or a resin window obtained by injection molding the resin composition according to any one of claims 1 to 3.

5. A film or sheet formed from the resin composition according to any one of claims 1 to 3.

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