Resin composition and molded article

Abstract

To provide a resin composition containing a polycarbonate resin, capable of providing a molding having excellent oil repellency and excellent transparency; and such a molding.SOLUTION: A resin composition contains a polycarbonate resin containing a constitutional unit represented by a formula (1), which is more than 90 mol% of all the constitutional units, and a fluorinated polymer. The fluorinated polymer contains a fluorine atom and a constitutional unit derived from a compound F containing CH2=CH-C(=O)- or CH2=C(CH3)-C(=O)-. Relative to the total mass of the polycarbonate resin and the fluorinated polymer, the fluorinated polymer is 0.1-5.0 mass%. As measured in accordance with JIS K-7105, a test piece 2 mm thick made from the resin composition shows total light transmittance of 70% or more.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a resin composition and a molded article. [Background technology]

[0002] Techniques for subjecting the surface of a molded article to a fluorine treatment in order to impart oil repellency to the surface have been known for some time, and examples thereof include dipping treatment and coating treatment of the surface of the molded article. However, the method of fluorine-treating the surface of a molded article has the problem that the oil repellency does not last long, and the oil repellency deteriorates with repeated use. Therefore, as a method for imparting oil repellency, blending a fluorine-containing polymer into a thermoplastic resin has been investigated (Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-037085 [Patent Document 2] Japanese Patent Application Publication No. 2020-100780 Summary of the Invention [Problem to be solved by the invention]

[0004] Here, the inventors have conducted studies and found that when a fluorine-containing polymer is blended with a polycarbonate resin, the transparency of the molded article may be deteriorated. The present invention aims to solve the above problems, and aims to provide a resin composition containing a polycarbonate resin that can provide a molded article having excellent oil repellency and transparency, and a molded article obtained from the resin composition. [Means for solving the problem]

[0005] As a result of investigations conducted by the present inventors in light of the above problems, the above problems were solved by the following means. <1> A resin composition comprising a polycarbonate resin containing structural units represented by formula (1) in an amount of more than 90 mol % of all structural units, and a fluoropolymer, wherein the fluoropolymer contains structural units derived from compound F containing fluorine atoms and CH2=CH-C(=O)- or CH2=C(CH3)-C(=O)-, the fluoropolymer accounts for 0.1 to 5.0 mass % of the total mass of the polycarbonate resin and the fluoropolymer, and a 2 mm thick test piece formed from the resin composition has a total light transmittance of 70% or more as measured in accordance with JIS K-7105. Formula (1) [ka] (In formula (1), X 1 represents one of the following formulas: [ka] R 3 and R 4 each independently represents a hydrogen atom or a methyl group, and Z represents a group that bonds with C to form an alicyclic hydrocarbon having 6 to 12 carbon atoms which may have a substituent. <2> The fluorine-containing polymer further has a cyclic structure. <1> The resin composition according to claim 1. <3> The cyclic structure includes an aromatic ring. <2> The resin composition according to claim 1. <4> The compound F has a polyfluoroalkyl group having 1 to 6 carbon atoms and / or a polyfluoroether group having 1 to 6 carbon atoms. <1> ~ <3> The resin composition according to any one of the above. <5> a YI value of a 2 mm thick test piece formed from the resin composition, measured according to JIS K-7105, JIS Z-8722, and JIS K-7373, of 8.0 or less; <1> ~ <4> The resin composition according to any one of the above. <6> <1> ~ <5> A molded article formed from the resin composition according to any one of the above items. [Effects of the Invention]

[0006] According to the present invention, it is possible to provide a molded article which is a resin composition containing a polycarbonate resin and which has excellent oil repellency and transparency. DETAILED DESCRIPTION OF THE INVENTION

[0007] Hereinafter, an embodiment for carrying out the present invention (hereinafter simply referred to as "the present embodiment") will be described in detail. Note that the present embodiment is an example for explaining the present invention, and the present invention is not limited to only this embodiment. In this specification, the symbol "to" is used to mean that the numerical values ​​before and after it are included as the lower limit and upper limit. In this specification, various physical properties and characteristic values ​​are those at 23°C unless otherwise specified. If the standards shown in this specification differ depending on the year and the measurement method, etc., they will be based on the standards as of January 1, 2021, unless otherwise stated.

[0008] The resin composition of the present embodiment is a resin composition comprising a polycarbonate resin containing structural units represented by formula (1) at more than 90 mol % of all structural units, and a fluoropolymer, wherein the fluoropolymer contains structural units derived from compound F containing fluorine atoms and CH═CH-C(═O)- or CH═C(CH)-C(═O)-, the fluoropolymer accounts for 0.1 to 5.0 mass % of the total mass of the polycarbonate resin and the fluoropolymer, and a 2 mm thick test piece formed from the resin composition has a total light transmittance of 70% or more as measured in accordance with JIS K-7105. Formula (1) [ka] (In formula (1), X 1 represents one of the following formulas: [ka] R 3 and R 4each independently represents a hydrogen atom or a methyl group, and Z represents a group that bonds with C to form an alicyclic hydrocarbon having 6 to 12 carbon atoms which may have a substituent.

[0009] When a fluorine-based additive is blended with a polycarbonate resin, oil repellency is relatively improved, but transparency may be impaired. In this embodiment, both oil repellency and transparency are achieved by using a predetermined amount of a specific fluorine-containing polymer. That is, the fluorine atoms in the fluorine-containing polymer improve oil repellency. In this embodiment, in particular, by using a fluorine-containing polymer containing fluorine atoms and structural units derived from compound F containing CH═CH-C(═O)- or CH═C(CH)-C(═O)-, the fluorine atoms are dispersed without agglomeration in the fluorine-containing polymer, which is presumed to effectively improve oil repellency. Furthermore, because the structural units are derived from compound F containing CH═CH-C(═O)- or CH═C(CH)-C(═O)-, the polymer has high heat resistance and is resistant to decomposition even when melt-kneaded with a polycarbonate resin. Therefore, it is presumed that the transparency of the resulting molded article is improved. Furthermore, it is presumed that adjusting the blend amount of the fluorine-containing polymer prevents transparency from being impaired.

[0010] <Polycarbonate resin> The resin composition of this embodiment contains a polycarbonate resin containing more than 90 mol% of all structural units of structural units represented by formula (1). The polycarbonate resin used in this embodiment preferably contains 95 mol% or more of all structural units of structural units represented by formula (1), and more preferably 99 mol% or more of all structural units excluding terminal groups are structural units represented by formula (1). Formula (1) [ka] (In formula (1), X 1 represents one of the following formulas: [ka] R 3 and R 4each independently represents a hydrogen atom or a methyl group, and Z represents a group that bonds with C to form an alicyclic hydrocarbon having 6 to 12 carbon atoms which may have a substituent.

[0011] Examples of the alicyclic hydrocarbon formed by bonding Z to C include cycloalkylidene groups such as a cyclohexylidene group, a cycloheptylidene group, a cyclododecylidene group, an adamantylidene group, and a cyclododecylidene group. Examples of the alicyclic hydrocarbon having a substituent formed by bonding Z to C include methyl-substituted and ethyl-substituted alicyclic hydrocarbon groups described above. Among these, a cyclohexylidene group, a methyl-substituted cyclohexylidene group (preferably a 3,3,5-trimethyl-substituted cyclohexylidene group), and a cyclododecylidene group are preferred.

[0012] In formula (1), X 1 teeth, [ka] If R 3 and R 4 At least one of the groups is preferably a methyl group, and both are more preferably methyl groups. Also X 1 but, [ka] In this case, Z bonds to the carbon C bonded to the two phenyl groups in formula (1) to form a divalent alicyclic hydrocarbon group having 6 to 12 carbon atoms. Examples of the divalent alicyclic hydrocarbon group include cycloalkylidene groups such as cyclohexylidene, cycloheptylidene, cyclododecylidene, adamantylidene, and cyclododecylidene. Substituted groups include those having a methyl or ethyl substituent. Among these, a cyclohexylidene group, a methyl-substituted cyclohexylidene group (preferably a 3,3,5-trimethyl-substituted cyclohexylidene group), and a cyclododecylidene group are preferred. In formula (1), X 1 is preferably the following structure: [ka]

[0013] A preferred example of the structural unit represented by the above formula (1) is 2,2-bis(4-hydroxyphenyl)propane, that is, a structural unit formed from bisphenol A (carbonate structural unit).

[0014] In the present embodiment, the polycarbonate resin may contain only one type of constitutional unit represented by formula (1), or may contain two or more types.

[0015] In the present embodiment, the polycarbonate resin may contain other structural units in addition to the structural unit represented by formula (1). Examples of other structural units include structural units derived from dihydroxy compounds shown below.

[0016] Bis(4-hydroxyphenyl)methane, 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)pentane, 2,2-bis(4-hydroxyphenyl)-4-methylpentane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, 2,2-bis(4-hydroxy-3,5-dimethylphenyl)propane, 2,2-bis(4-hydroxy-3-(1-methylethyl)phenyl)propane, 2,2-bis(4-hydroxy-3-tert-butylphenyl)propane, 2,2-bis(4-hydroxy-3-(1-methylpropyl)phenyl)propane, 2,2-bis(4-hydroxy-3-cyclohexylphenyl)propane, 2,2-bis(4-hydroxy-3-phenylphenyl)propane, 1,1-bis(4-hydroxyphenyl)decane, 1,1-bis(4-hydroxyphenyl) Cyclohexane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, 1,1-bis(4-hydroxyphenyl)phenylmethane, 1,1-bis(4-hydroxy-3-methylphenyl)cyclohexane, 1,1-bis(4-hydroxy-3,5-dimethylphenyl)cyclohexane, 1,1-bis(4-hydroxy-3-(1-methylethyl)phenyl)cyclohexane, 1,1-bis(4-hydroxy-3-tert-butylphenyl)cyclohexane, 1,1-bis(4-hydroxy-3-(1-methylpropyl)phenyl)cyclohexane, 1,1-bis(4-hydroxy-3-cyclohexylphenyl)cyclohexane, 1,1-bis(4-hydroxy-3-phenylphenyl)cyclohexane, 1,1-bis(4-hydroxy-3-methylphenyl)-1-phenylethane, 1,1-bis(4-hydroxy-3 ,1,1-bis(4-hydroxy-3-(1-methylethyl)phenyl)-1-phenylethane, 1,1-bis(4-hydroxy-3-tert-butylphenyl)-1-phenylethane, 1,1-bis(4-hydroxy-3-(1-methylpropyl)phenyl)-1-phenylethane, 1,1-bis(4-hydroxy-3-cyclohexylphenyl)-1-phenylethane, 1,1-bis(4-hydroxy-3-phenylphenyl)-1-phenylethane, 1,1-bis(4-hydroxyphenyl)cyclopentane, 1,1-bis(4-hydroxyphenyl)cyclopentane, 1,1-bis(4-hydroxyphenyl)cyclooctane, 4,4'-(1,3-phenylenediisopropylidene)bisphenol, 4,4'-(1,4-phenylenediisopropylidene)bisphenol, 9,9-bis(4-hydroxyphenyl)fluorene, 9,9-bis(4-hydroxy-3-methylphenyl)fluorene, 4,4'-dihydroxybenzophenone, 4,4'-dihydroxyphenyl ether, 4,4'-dihydroxybiphenyl, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 1,1-bis(4-hydroxy-6-methyl-3-tert-butylphenyl)butane.

[0017] In addition, as an embodiment of other structural units, the structural unit represented by formula (2) described in paragraph 0008 of WO 2017 / 099226, the description in paragraphs 0043 to 0052 of WO 2017 / 099226, and the description in JP 2011-046769 A can be referred to, the contents of which are incorporated herein by reference.

[0018] The viscosity average molecular weight (Mv) of the polycarbonate resin used in this embodiment has a lower limit of preferably 5,000 or more, more preferably 8,000 or more, even more preferably 10,000 or more, and still more preferably 12,000 or more. The upper limit of Mv is preferably 32,000 or less, more preferably 30,000 or less, even more preferably 29,000 or less, even more preferably 27,000 or less, and still more preferably 25,000 or less. When two or more types of polycarbonate resins are contained, the total is the value obtained by multiplying the viscosity average molecular weight of each polycarbonate resin by its mass fraction. By setting the viscosity average molecular weight to the above lower limit or more, moldability is improved and molded articles with high mechanical strength can be obtained, while by setting the viscosity average molecular weight to the above upper limit or less, the flowability of the molded articles is improved and thin-walled molded articles can be efficiently produced. In particular, the viscosity average molecular weight of the polycarbonate resin is preferably 20,000 to 30,000, and more preferably 20,000 to 25,000. The viscosity average molecular weight (Mv) is measured according to the method described in the examples below.

[0019] The pencil hardness of the polycarbonate resin used in this embodiment is preferably 2B to HB.

[0020] The method for producing the polycarbonate resin used in this embodiment is not particularly limited, but for example, the description in paragraphs 0027 to 0043 and the Examples of JP-A-2014-065901 can be referred to, the contents of which are incorporated herein by reference.

[0021] The content of polycarbonate resin in the resin composition of this embodiment is preferably 80% by mass or more, more preferably 85% by mass or more, even more preferably 90% by mass or more, and even more preferably 94% by mass or more. By making it equal to or greater than the lower limit, the impact strength and heat resistance of a molded article formed from the resin composition tend to be further improved. Also, it is preferably 99% by mass or less. By making it equal to or less than the upper limit, the flowability of the resin composition tends to be improved.

[0022] <Fluorine-containing polymer> The resin composition of this embodiment contains a fluorine-containing polymer. The fluorine-containing polymer contains structural units derived from compound F containing fluorine atoms and CH═CH—C(═O)— or CH═C(CH)—C(═O)—. By containing such a fluorine-containing polymer, oil repellency can be achieved while maintaining the high transparency inherent to polycarbonate resins. The reason for this is thought to be that by forming a polymer in which CH═CH—C(═O)— or CH═C(CH)—C(═O)— is polymerized, the heat resistance of the fluorine-containing polymer is improved and decomposition of the fluorine-containing polymer can be suppressed even during molding of the polycarbonate resin. It is therefore presumed that compatibility with the polycarbonate resin can be maintained and clouding can be effectively suppressed. It is also presumed that the oil repellency can be effectively achieved by the fluorine atoms being uniformly present in the side chains of the fluorine-containing polymer.

[0023] The fluorine-containing polymer used in this embodiment preferably further has a cyclic structure, more preferably contains an aromatic ring. By containing a cyclic structure, compatibility with polycarbonate resins improves, and the transparency of the resulting molded article tends to be further improved. This effect is particularly remarkable when an aromatic polycarbonate resin is used as the polycarbonate resin. The cyclic structure is a 5- or 6-membered monocyclic ring or a fused ring formed by condensing two or more (preferably two or three, more preferably two) 5- or 6-membered monocyclic rings, and a 6-membered monocyclic ring is preferred. Specifically, a cyclohexane ring and a benzene ring are preferred, and a benzene ring is more preferred.

[0024] In this embodiment, the compound F preferably contains a fluorine-containing group, and more preferably contains a polyfluoroalkyl group having 1 to 6 carbon atoms and / or a polyfluoroether group having 1 to 6 carbon atoms. Such a fluorine-containing group disperses well in the polycarbonate resin, and is less likely to impair the water repellency of the resulting molded article, thereby enabling the oil repellency to be effectively achieved.

[0025] In this embodiment, the compound F is preferably represented by formula (F). Formula (F) X f -L f -Ar-L f -R f (In formula (F), X f is CH2=CH-C(=O)- or CH2=C(CH3)-C(=O)-, and L f are each independently a divalent linking group, Ar is an aromatic ring, and R f is a polyfluoroalkyl group having 1 to 6 carbon atoms or a polyfluoroether group having 1 to 6 carbon atoms. L f is preferably an alkylene group having 1 to 6 carbon atoms which may be substituted with a hetero atom or a fluorine atom, or a group consisting of a combination thereof. Also, Ar is preferably a benzene ring. The molecular weight of compound F is preferably 200-500.

[0026] The proportion of structural units derived from compound F in the fluorine-containing polymer used in this embodiment is, for example, 50% by mass or more, and may be 90% by mass or more, of all structural units.

[0027] In this embodiment, the content of the fluorine-containing polymer is 0.1 to 5.0% by mass, based on the total mass of the polycarbonate resin and the fluorine-containing polymer. By making the content equal to or greater than the lower limit, oil repellency is improved. Meanwhile, by making the content equal to or less than the upper limit, the transparency of the polycarbonate can be maintained. The lower limit is preferably 0.2% by mass or more, more preferably 0.3% by mass or more, and even more preferably 0.4% by mass or more. Meanwhile, the upper limit is preferably 4.0% by mass or less, more preferably 3.0% by mass or less, even more preferably 2.0% by mass or less, even more preferably 1.5% by mass or less, and even more preferably 0.8% by mass or less. The resin composition of the present embodiment may contain only one type of fluorine-containing polymer, or may contain two or more types. When two or more types are contained, the total amount is preferably in the above range.

[0028] <Other ingredients> The resin composition of the present embodiment may contain other components as needed, as long as the desired physical properties are not significantly impaired. Examples of the other components include thermoplastic resins other than the polycarbonate resins described above (e.g., acrylic resins), various resin additives, and the like. Examples of resin additives include stabilizers (heat stabilizers, antioxidants, etc.), ultraviolet absorbers, antistatic agents, flame retardants, flame retardant assistants, dyes, pigments, antifogging agents, antiblocking agents, flow improvers, plasticizers, dispersants, antibacterial agents, etc. Note that one type of resin additive may be contained, or two or more types may be contained in any combination and ratio. For information on antistatic agents, please refer to the descriptions in paragraphs 0063 to 0067 of JP 2016-216534 A, the contents of which are incorporated herein by reference. For flame retardants, refer to paragraphs 0068 to 0075 of JP 2016-216534 A, the contents of which are incorporated herein by reference.

[0029] <<Stabilizer>> The stabilizer includes a heat stabilizer and an antioxidant. Examples of the stabilizer include phenol-based stabilizers, amine-based stabilizers, phosphorus-based stabilizers, thioether-based stabilizers, etc. Among these, in this embodiment, phosphorus-based stabilizers and phenol-based stabilizers are preferred. Any known phosphorus-based stabilizer can be used. Specific examples include phosphorus oxoacids such as phosphoric acid, phosphonic acid, phosphorous acid, phosphinic acid, and polyphosphoric acid; metal acid pyrophosphates such as sodium acid pyrophosphate, potassium acid pyrophosphate, and calcium acid pyrophosphate; phosphates of Group 1 or Group 2B metals such as potassium phosphate, sodium phosphate, cesium phosphate, and zinc phosphate; organic phosphate compounds, organic phosphite compounds, and organic phosphonite compounds, with organic phosphite compounds being particularly preferred.

[0030] Examples of organic phosphite compounds include triphenyl phosphite, tris(mononylphenyl)phosphite, tris(mononyl / dinonylphenyl)phosphite, tris(2,4-di-tert-butylphenyl)phosphite, monooctyldiphenyl phosphite, dioctylmonophenyl phosphite, monodecyldiphenyl phosphite, didecylmonophenyl phosphite, tridecyl phosphite, trilauryl phosphite, tristearyl phosphite, and 2,2-methylenebis(4,6-di-tert-butylphenyl)octyl phosphite. Specific examples of such organic phosphite compounds include "ADK STAB (registered trademark; the same applies hereinafter) 1178," "ADK STAB 2112," and "ADK STAB HP-10" manufactured by ADEKA CORPORATION, "JP-351," "JP-360," and "JP-3CP" manufactured by Johoku Chemical Industry Co., Ltd., and "IRGAFOS (registered trademark; the same applies hereinafter) 168" manufactured by BASF.

[0031] As the phenol-based stabilizer, a hindered phenol-based stabilizer is preferably used. Specific examples of hindered phenol stabilizers include pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, thiodiethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N,N'-hexane-1,6-diylbis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionamide], 2,4-dimethyl-6-(1-methylpentadecyl)phenol, diethyl[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl]phosphate, 3,3',3'',5,5',5''-hexa-tert-butyl-a,a',a''-(mesityle) 4,6-bis(octylthiomethyl)-o-cresol, ethylene bis(oxyethylene) bis[3-(5-tert-butyl-4-hydroxy-m-tolyl)propionate], hexamethylene bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 1,3,5-tris(3,5-di-tert-butyl)tri-p-cresol -4-hydroxybenzyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, 2,6-di-tert-butyl-4-(4,6-bis(octylthio)-1,3,5-triazin-2-ylamino)phenol, 2-[1-(2-hydroxy-3,5-di-tert-pentylphenyl)ethyl]-4,6-di-tert-pentylphenyl acrylate, and the like.

[0032] Among these, pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate are preferred. Specific examples of such hindered phenol stabilizers include "Irganox (registered trademark; the same applies hereinafter) 1010" and "Irganox 1076" manufactured by BASF, and "ADK STAB AO-50" and "ADK STAB AO-60" manufactured by ADEKA.

[0033] The content of the stabilizer in the resin composition of this embodiment is usually 0.001 part by mass or more, preferably 0.005 part by mass or more, more preferably 0.01 part by mass or more, and usually 1 part by mass or less, preferably 0.5 part by mass or less, more preferably 0.3 part by mass or less, relative to 100 parts by mass of the polycarbonate resin. By setting the content of the stabilizer within this range, the effect of adding the stabilizer can be more effectively exerted. The resin composition of the present embodiment may contain only one stabilizer, or may contain two or more stabilizers. When two or more stabilizers are contained, the total amount is preferably in the above range.

[0034] The resin composition of the present embodiment is prepared so that the total of the polycarbonate resin, the fluorine-containing polymer, and other components that are blended as necessary is 100% by mass. In the resin composition of the present embodiment, the polycarbonate resin and the fluoropolymer preferably account for 95% by mass or more, more preferably 98% by mass or more, of the resin composition in total, and the upper limit may be 100% by mass. In the resin composition of this embodiment, the polycarbonate resin, the fluorine-containing polymer, and the stabilizer preferably account for 96% by mass or more, more preferably 99% by mass or more, of the resin composition in total, and the upper limit may be 100% by mass.

[0035] <Physical properties of resin composition> The resin composition of this embodiment has high transparency. Specifically, the total light transmittance of a 2 mm thick test piece formed from the resin composition, measured according to JIS K-7105, is 70% or more, preferably 76% or more, more preferably 77% or more, more preferably 80% or more, even more preferably 81% or more, still more preferably 82% or more, even more preferably 84% or more, and still more preferably 85% or more. The upper limit of the total light transmittance is ideally 100%, but practically 99% or less. Such a high total light transmittance can be achieved, for example, by using a polycarbonate resin, by using a predetermined fluorine-containing polymer, or by adjusting the blending amounts of the predetermined fluorine-containing polymer and other components.

[0036] The resin composition of this embodiment preferably has a YI value of 8.0 or less, more preferably 7.0 or less, even more preferably 6.0 or less, even more preferably 5.0 or less, still more preferably 4.5 or less, and even more preferably 4.0 or less, when measured in accordance with JIS K-7105, JIS Z-8722, and JIS K-7373 on a 2 mm thick test piece formed from the resin composition. The lower limit of the YI value is ideally 0, but practically a value of 0.1 or more is preferred. Such a low YI value can be achieved by using a predetermined fluorine-containing polymer and adjusting the blending amounts of the predetermined fluorine-containing polymer and other components.

[0037] Furthermore, the haze of a 2 mm thick test piece formed from the resin composition, measured according to JIS K-7105, is preferably 50.0% or less, more preferably 40.0% or less, even more preferably 30.0% or less, even more preferably 20.0% or less, even more preferably 10.0% or less, even more preferably 6.0% or less, particularly preferably 5.5% or less, and even more particularly preferably 4.5% or less. The lower limit of the haze is ideally 0%, but practically 0.1% or more is preferred. Such low haze can be achieved by using a predetermined amount of a predetermined fluorine-containing polymer.

[0038] A molded article obtained using the resin composition of this embodiment preferably has a large oil contact angle. When the resin composition is molded into a flat plate with a thickness of 2 mm, the oil contact angle is preferably 10° or more, more preferably 14° or more, even more preferably 15° or more, and even more preferably 17° or more. The upper limit of the oil contact angle is not particularly limited, but can be 40° or less, or can be 33° or less. Such a high oil contact angle can be achieved by using a predetermined amount of a predetermined fluorine-containing polymer.

[0039] The various physical properties are measured according to the descriptions in the examples below. The resin composition of the present embodiment preferably satisfies at least two of the above physical property values, more preferably satisfies at least three of the above physical property values, and even more preferably satisfies all of the above physical property values.

[0040] <Method of manufacturing resin composition> The method for producing the resin composition of this embodiment is not limited, and a wide variety of known methods for producing resin compositions can be employed, including a method in which the polycarbonate resin, the fluorine-containing polymer, and other components added as needed are premixed using various mixers such as a tumbler or a Henschel mixer, and then melt-kneaded using a mixer such as a Banbury mixer, a roll, a Brabender, a single-screw kneading extruder, a twin-screw kneading extruder, a kneader, etc. The melt-kneading temperature is not particularly limited, but is usually in the range of 240 to 320°C.

[0041] <Molded products> The above-described resin composition (e.g., pellets) can be molded into a molded article by various molding methods. That is, the molded article of this embodiment is molded from the resin composition of this embodiment. The shape of the molded article is not particularly limited and can be appropriately selected depending on the use and purpose of the molded article. Examples include film-like, rod-like, cylindrical, ring-like, circular, elliptical, polygonal, irregularly shaped, hollow, frame-like, box-like, panel-like, and button-like shapes. Of these, film-like, frame-like, panel-like, and button-like shapes are preferred, and the thickness of the frame-like and panel-like shapes is, for example, about 1 mm to 5 mm.

[0042] The method for forming the molded article is not particularly limited, and conventionally known molding methods can be used, such as injection molding, injection compression molding, extrusion molding, profile extrusion, transfer molding, blow molding, gas-assisted blow molding, blow molding, extrusion blow molding, IMC (in-mold coating) molding, rotational molding, multilayer molding, two-color molding, insert molding, sandwich molding, foam molding, and pressure molding. The resin composition of this embodiment is particularly suitable for molded articles obtained by injection molding, injection compression molding, and extrusion molding. However, it goes without saying that the resin composition of this embodiment is not limited to molded articles obtained by these methods.

[0043] The molded article of this embodiment is suitable for use in parts for electrical and electronic devices, office automation equipment, mobile information terminals, machine parts, home appliances, vehicle parts, various containers, lighting equipment, displays, etc. Among these, it is particularly suitable for use in display parts, mobile information terminal parts, home appliance parts, and interior furnishing parts, and is more preferably used as display parts. Examples of display parts include those for vehicle interiors and smartphones. [Example]

[0044] The present invention will be explained in more detail below with reference to examples. The materials, amounts used, ratios, processing details, processing procedures, etc. shown in the following examples can be appropriately changed without departing from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below. If the measuring instruments used in the examples are difficult to obtain due to discontinuation or the like, measurements can be made using other instruments with equivalent performance.

[0045] 1.Raw materials The raw materials shown in Tables 1 and 2 below were used. [Table 1] [Table 2]

[0046] <Measurement of viscosity average molecular weight (Mv) of polycarbonate resin> The viscosity average molecular weight (Mv) of the polycarbonate resin was calculated from the intrinsic viscosity (η) (unit: dL / g) at 20°C using an Ubbelohde viscometer with methylene chloride as a solvent, using the following Schnell viscosity formula: η = 1.23 × 10 -4 Mv 0.83

[0047] <Measurement of pencil hardness of polycarbonate resin> The polycarbonate resin pellets were dried at 100°C for 5 hours, and then injection-molded into flat test pieces (90 mm x 50 mm x 2 mm thick) using an injection molding machine ("J55-60H" manufactured by The Japan Steel Works, Ltd.) under conditions of a cylinder set temperature of 280°C, a mold temperature of 80°C, a screw rotation speed of 100 rpm, and an injection speed of 100 mm / s. The pencil hardness of the obtained flat test piece (90 mm×50 mm×2 mm thick) was measured in accordance with ISO 15184 using a pencil hardness tester under a load of 750 g to determine the hardness. The pencil hardness tester used was manufactured by Toyo Seiki Co., Ltd.

[0048] Examples 1 to 4, Comparative Examples 1 to 5 <Manufacture of Resin Composition Pellets> Each component described in Table 1 or Table 2 above was blended at the ratios (shown in parts by mass) shown in Table 3 below, and after being uniformly mixed with a tumbler mixer, 1 vent was supplied from an upstream feeder to a twin-screw extruder (manufactured by Shibaura Machine Co., Ltd., TEM26SX), and melt-kneaded at a cylinder set temperature of 260°C, a screw rotation speed of 250 rpm, and a discharge rate of 25 kg / hr to obtain resin composition pellets.

[0049] <YI of Molded Product> After drying the resin composition pellets obtained above at 100°C for 5 hours, using an injection molding machine (``J55-60H'' manufactured by Japan Steel Works, Ltd.), under the conditions of a cylinder set temperature of 280°C, a mold temperature of 80°C, a screw rotation speed of 100 rpm, and an injection speed of 100 mm / s, a flat test piece (90 mm × 50 mm × 2 mm thick) was injection molded. For the flat test piece obtained above, in accordance with JIS K-7105, using a spectroscopic colorimeter, the YI value at 23°C was measured. As the spectroscopic colorimeter, a SE-2000 type spectroscopic colorimeter manufactured by Nippon Denshoku Industries Co., Ltd. was used.

[0050] <HAZE (General Mold, 80°C) and Total Light Transmittance> After drying the resin composition pellets obtained above at 100°C for 5 hours, using an injection molding machine (``J55-60H'' manufactured by Japan Steel Works, Ltd.), under the conditions of a cylinder set temperature of 280°C, a mold temperature of 80°C, a screw rotation speed of 100 rpm, and an injection speed of 100 mm / s, a flat test piece (90 mm × 50 mm × 2 mm thick) was injection molded. For the flat test piece obtained above, in accordance with JIS K-7105, using a haze meter, the HAZE (haze) and total light transmittance at 23°C were measured. As the haze meter, an NDH-2000 type haze meter manufactured by Nippon Denshoku Industries Co., Ltd. was used. The units of HAZE and total light transmittance were shown in %.

[0051] <Oil repellency> The polycarbonate resin pellets were dried at 100°C for 5 hours, and then injection molded into a three-tiered plate (90mm x 50mm x thickness from the gate side: 3mm (length 20mm), 2mm (length 45mm), 1mm (length 25mm)) using an injection molding machine ("J55-60H" manufactured by The Japan Steel Works, Ltd.) under conditions of a cylinder set temperature of 280°C, a mold temperature of 70°C, a screw rotation speed of 100 rpm, and an injection speed of 25mm / s. After removing static electricity from the resulting three-tiered plate having a thickness of 2 mm, oleic acid (Tokyo Chemical Industry Co., Ltd., product number: O0180) was dropped into droplets with a diameter of 0.5 mm using a microsyringe, and the contact angle (unit: degree) was measured. The measurement device used was a solid-liquid interface analyzer, DropMaster 300, manufactured by Kyowa Interface Science Co., Ltd. Oil contact angles of 5 degrees or less were deemed unmeasurable.

[0052] [Table 3]

[0053] As is clear from the above results, the molded article formed from the resin composition of the present invention had excellent oil repellency and transparency, and also had a low YI value.

Claims

1. A resin composition comprising a polycarbonate resin containing more than 90 mol% of all structural units of structural units represented by formula (1) and a fluorine-containing polymer, The fluorine-containing polymer is a polymer having a fluorine atom and a CH ２ =CH-C(=O)- or CH ２ =C(CH ３ )-C(=O)-, The fluorine-containing polymer further has a cyclic structure, The fluoropolymer is contained in an amount of 0.1 to 5.0% by mass relative to the total mass of the polycarbonate resin and the fluoropolymer, A resin composition, wherein a test piece having a thickness of 2 mm formed from the resin composition has a total light transmittance of 70% or more as measured in accordance with JIS K-7105. Formula (1) 【Chemical 1】 (In formula (1), X １ represents one of the following formulas: 【Chemistry 2】 R 3 and R 4 each independently represents a hydrogen atom or a methyl group, and Z represents a group that bonds with C to form an alicyclic hydrocarbon having 6 to 12 carbon atoms which may have a substituent.

2. The resin composition according to claim 1 , wherein the cyclic structure includes an aromatic ring.

3. 3. The resin composition according to claim 1, wherein the compound F has a polyfluoroalkyl group having 1 to 6 carbon atoms and / or a polyfluoroether group having 1 to 6 carbon atoms.

4. The resin composition according to any one of claims 1 to 3, wherein a YI value of a 2 mm thick test piece formed from the resin composition, measured according to JIS K-7105, JIS Z-8722, and JIS K-7373, is 8.0 or less.

5. A molded article formed from the resin composition according to any one of claims 1 to 4.

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