Resin composition and molded article

Abstract

To provide a resin composition containing a polycarbonate resin which is excellent in water repellency and droplet removability.SOLUTION: A resin composition contains (A) a polycarbonate resin, and (B) a wax, wherein with respect to 100 pts.mass of (A) the polycarbonate resin, more than 1.00 pts.mass and 4.00 pts.mass or less of (B) the wax is contained; (A) the polycarbonate resin contains a constitutional unit represented by formula (1); when the resin composition is formed into a flat plate with a thickness of 2 mm, a contact angle of water is 95° or more and a slip angle is less than 34°. In the formula (1), R1 represents a methyl group, R2 represents a hydrogen atom or a methyl group, and X1 represents CR3R4 (R3 and R4 each independently represent a hydrogen atom or a methyl group).SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a resin composition containing a polycarbonate resin, and also to a molded article using the resin composition. [Background technology]

[0002] Polycarbonate resins are excellent in mechanical strength, electrical properties, transparency, etc., and are widely used as engineering plastics in various fields such as the fields of electrical and electronic equipment and automobiles. In recent years, in these fields, molded products have become thinner, less expensive, smaller, and lighter, which has led to demands for further improvements in the performance of molding materials, and several proposals have been made.

[0003] For example, Patent Document 1 describes an invention relating to a polybutylene terephthalate resin composition characterized by containing 100 parts by mass of polybutylene terephthalate resin (A), 0.2 to 12 parts by mass of a polyolefin resin or a styrene resin (B), 0.5 to 10 parts by mass of a silicone compound (C), and 0.5 to 7 parts by mass of fumed silica (D).

[0004] Furthermore, Patent Document 2 describes an invention relating to a polycarbonate resin composition comprising a polycarbonate resin (A) containing structural units derived from a dihydroxy compound of a specific structure and a phenyl group-containing organopolysiloxane (B) having a silyl group represented by a specific formula at its terminal, and comprising a specific alkyl group or aryl group.

[0005] Furthermore, Patent Document 3 describes an invention relating to a resin composition containing (A) a polycarbonate resin and (B) an organopolysiloxane, which has a haze of 5.0% or less and a water contact angle of 87° or more when molded into a flat plate with a thickness of 2 mm. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2018-62554 A [Patent Document 2] Japanese Patent Application Publication No. 2018-154826 [Patent Document 3] Patent Publication No. 2021-38305 Summary of the Invention [Problem to be solved by the invention]

[0007] In recent years, there has been increasing demand for molded articles produced using resin compositions containing polycarbonate resins that have a large water contact angle and excellent transparency. Therefore, there is a need for further materials that can be used in a variety of applications. Accordingly, as disclosed in Patent Document 3, resin compositions and molded articles that have a large water contact angle and excellent transparency have been developed. However, there is a need for further improvement in water repellency, and an object of the present invention is to provide resin compositions and molded articles that have excellent water repellency and droplet removal properties. [Means for solving the problem]

[0008] The present inventors have conducted extensive research to solve the above problems and have found that the following inventions meet the above objectives, thereby completing the present invention.

[0009] <1> A resin composition comprising (A) a polycarbonate resin and (B) a wax, wherein the (B) wax is contained in an amount of more than 1.00 parts by mass and not more than 4.00 parts by mass per 100 parts by mass of the (A) polycarbonate resin, the (A) polycarbonate resin containing a structural unit represented by the following formula (1), and when the resin composition is molded into a flat plate having a thickness of 2 mm, the water contact angle is 95° or more and the sliding angle is less than 34°. [ka] In formula (1), R 1 represents a methyl group, and R 2represents a hydrogen atom or a methyl group, and X 1 represents a group represented by the following formula (1-a) or (1-b). [ka] In formula (1-a) and formula (1-b), R 3 and R 4 each independently represents a hydrogen atom or a methyl group; Z 1 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 melting point of the wax is 80°C or less. <1> The resin composition according to claim 1. <3> The wax is a natural wax. <1> The resin composition described above. <4> The polycarbonate resin (A) further contains at least one structural unit represented by the following formula (2): <1> The resin composition according to any one of the preceding claims. [ka] In formula (2), X 2 represents a group represented by the following formula (2-a) or (2-b). [ka] In formulas (2-a) and (2-b), R 5 and R 6 each independently represents a hydrogen atom or a methyl group; Z 2 represents a group that bonds with C to form an alicyclic hydrocarbon having 6 to 12 carbon atoms which may have a substituent. <5> The mass ratio of the structural unit represented by formula (1) to the structural unit represented by formula (2) in the polycarbonate resin (A) is 10:90 to 100:0. <4> The resin composition according to claim 1. <6> The aforementioned <1> ~ <5> A molded article formed from the resin composition according to any one of claims 1 to 4. <7> The above is a display part, a mobile information terminal part, a home appliance part, or an indoor furniture part. <6> The molded article described above. [Effects of the Invention]

[0010] The present invention provides a resin composition and a molded article that are excellent in water repellency and droplet removability. DETAILED DESCRIPTION OF THE INVENTION

[0011] The following describes in detail an embodiment of the present invention, but the following description of the constituent elements is one example (typical example) of an embodiment of the present invention, and the present invention is not limited to the following content unless the gist of the present invention is changed. Note that when the expression "to" is used in this specification, it is used as an expression that includes the numerical values ​​before and after it.

[0012] <Resin composition> The present invention relates to a resin composition (hereinafter sometimes referred to as "the resin composition of the present invention") comprising (A) a polycarbonate resin and (B) a wax, wherein the (B) wax is contained in an amount of more than 1.00 part by mass and not more than 4.00 parts by mass per 100 parts by mass of the (A) polycarbonate resin, the (A) polycarbonate resin containing a structural unit represented by formula (1), and when the resin composition is molded into a 2 mm thick flat plate, the water contact angle is 95° or more and the sliding angle is less than 34°.

[0013] <(A) Polycarbonate resin> The resin composition of the present invention contains a polycarbonate resin (A). This polycarbonate resin (A) contains a structural unit (a1) represented by the following formula (1).

[0014] (Structural unit (a1)) The structural unit (a1) is represented by the following formula (1).

[0015] [ka]

[0016] In formula (1), R 1 represents a methyl group, and R 2 represents a hydrogen atom or a methyl group, and X 1 represents a group represented by the following formula (1-a) or formula (1-b).

[0017] [ka]

[0018] In formulas (1-a) and (1-b), R 3 and R 4 each independently represents a hydrogen atom or a methyl group; Z 1 represents a group that bonds with C to form an alicyclic hydrocarbon having 6 to 12 carbon atoms which may have a substituent.

[0019] In the constitutional unit represented by formula (1), R 2 is preferably a hydrogen atom.

[0020] In formula (1), X 1 is a group represented by the above formula (1-a), R 3 and R 4 At least one of the groups is preferably a methyl group, and both are more preferably methyl groups.

[0021] In addition, in formula (1), X 1 is a group represented by the above formula (1-b), Z 1 is bonded to the carbon atoms C bonded to the two benzene rings in the above 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 a cyclohexylidene group, a cycloheptylidene group, a cyclododecylidene group, and an adamantylidene group. Z 1Examples of the alicyclic hydrocarbon having a substituent formed by bonding 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.

[0022] In formula (1), X 1 is preferably a group represented by the above formula (1-a).

[0023] Specific examples of the constitutional unit represented by the above formula (1) include: Examples include structural units (carbonate structural units) composed of dihydroxy compounds such as 2,2-bis(3-methyl-4-hydroxyphenyl)propane (i.e., bisphenol C), 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane, 1,1-bis(3-methyl-4-hydroxyphenyl)cyclohexane, and 1,1-bis(3,5-dimethyl-4-hydroxyphenyl)cyclohexane, and structural units composed of 2,2-bis(3-methyl-4-hydroxyphenyl)propane are preferred.

[0024] The structural unit (a1) may contain only one type of structural unit represented by formula (1), or may contain two or more types.

[0025] (Structural unit (a2)) The polycarbonate resin (A) in the resin composition of the present invention may further contain at least one structural unit (a2) represented by formula (2). By containing the structural unit (a2), the heat resistance of the resulting molded article tends to be improved. The polycarbonate resin containing the structural unit (a1) and the structural unit (a2) includes both a mixture containing a polycarbonate resin containing the structural unit (a1) and a polycarbonate resin containing the structural unit (a2), and a copolymer containing the structural unit (a1) and the structural unit (a2).

[0026] The structural unit (a2) is represented by the following formula (2).

[0027] [ka]

[0028] In formula (2), X 2 represents a group represented by the following formula (2-a) or formula (2-b).

[0029] [ka]

[0030] In formulas (2-a) and (2-b), R 5 and R 6 each independently represents a hydrogen atom or a methyl group; Z 2 represents a group that bonds with C to form an alicyclic hydrocarbon having 6 to 12 carbon atoms which may have a substituent.

[0031] In formula (2), X 2 is a group represented by the above formula (2-a), R 5 and R 6 At least one of the groups is preferably a methyl group, and both are more preferably methyl groups.

[0032] In formula (2), X 2 is a group represented by the above formula (2-b), Z 2 is bonded to the carbon C bonded to the two benzene rings in the above formula (2) 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 a cyclohexylidene group, a cycloheptylidene group, a cyclododecylidene group, and an adamantylidene group. Z 2 Examples of the alicyclic hydrocarbon having a substituent formed by bonding 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.

[0033] In formula (2), X 2 is preferably a group represented by the above formula (2-a).

[0034] Specific examples of the structural unit represented by the above formula (2) include structural units (carbonate structural units) composed of dihydroxy compounds such as 2,2-bis(4-hydroxyphenyl)propane (i.e., bisphenol A), bis(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)cyclooctane, and 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, with a structural unit composed of 2,2-bis(4-hydroxyphenyl)propane being preferred.

[0035] The structural unit (a2) may contain only one type of structural unit represented by formula (2), or may contain two or more types.

[0036] X in equation (1) 1 and X in equation (2) 2 are preferably the same group.

[0037] In this embodiment, the polycarbonate resin may contain other structural units in addition to the structural unit represented by formula (1) and the structural unit represented by formula (2). Examples of other structural units include structural units derived from dihydroxy compounds shown below.

[0038] 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-(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 propane, 1,1-bis(4-hydroxyphenyl)decane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, 1,1-bis(4-hydroxyphenyl)phenylmethane, 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-3,5-dimethylphenyl)-1-phenylethane, 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-cyclohexane 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-hydroxy-6-methyl-3-tert-butylphenyl)butane.

[0039] 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.

[0040] By adopting such a constitution, it is possible to obtain a resin composition that is excellent in water repellency and droplet removal properties, and also has improved transparency and excellent extrudability.

[0041] Furthermore, in the polycarbonate resin used in this embodiment, the proportion of the structural units represented by formula (1) relative to all structural units is preferably 5 mol% or more, more preferably 10 mol% or more, more preferably 12 mol% or more, and even more preferably 14 mol% or more. Depending on the application, it may be 20 mol% or more, or 25 mol% or more. By ensuring that the proportion is equal to or greater than the above lower limit, the surface hardness and transparency of the molded article tend to be improved. Furthermore, in the polycarbonate resin used in this embodiment, the proportion of the structural units represented by formula (1) relative to all structural units may be 100 mol%, preferably 95 mol% or less. Depending on the application, it may be 90 mol% or less, 80 mol% or less, 70 mol% or less, 60 mol% or less, or 50 mol% or less. By ensuring that the proportion is equal to or less than the above upper limit, the impact resistance of the resulting molded article tends to be further improved, and the heat resistance of the molded article also tends to be improved. Furthermore, by ensuring that the proportion is equal to or less than the above upper limit, weather resistance also tends to be improved.

[0042] Furthermore, in the polycarbonate resin used in this embodiment, the proportion of the structural unit represented by formula (2) in all structural units is preferably 0 mol% or more, more preferably 5 mol% or more, and even more preferably 10 mol% or more. Depending on the application, it may be 12 mol% or more, 14 mol% or more, 20 mol% or more, 30 mol% or more, 35 mol% or more, 40 mol% or more, 50 mol% or more, 70 mol% or more, 75 mol% or more, or 80 mol% or more. By containing the structural unit represented by formula (2), the impact resistance of the obtained molded article tends to be further improved, and the heat resistance of the molded article also tends to be improved. Furthermore, weather resistance also tends to be improved. Furthermore, in the polycarbonate resin used in this embodiment, the proportion of the structural units represented by formula (2) is 90 mol% or less, preferably 88 mol% or less, of all structural units. Depending on the application, it may be 86 mol% or less, 80 mol% or less, 75 mol% or less, 65 mol% or less, 50 mol% or less, 30 mol% or less, 25 mol% or less, or 20 mol% or less. By keeping it below the upper limit, the surface hardness of the molded product tends to be increased. However, the total of the structural units represented by formula (1) and the structural units represented by formula (2) does not exceed 100 mol%.

[0043] In the polycarbonate resin used in this embodiment, the total of the structural units represented by the above formula (1) and the structural units represented by the formula (2) preferably accounts for 90% by mass or more, more preferably 95% by mass or more, and even more preferably 99% by mass or more of all structural units excluding terminal groups. The upper limit of this total is 100% by mass or less.

[0044] In the (A) polycarbonate resin, the mass ratio of the structural unit (a1) represented by formula (1) to the structural unit (a2) represented by formula (2) (structural unit (a1):(a2)) can be 10:90 to 100:0. By setting such a mass ratio, it is possible to improve the color developability while maintaining the heat resistance of the obtained molded article. To further improve the balance between heat resistance and color developability, (a1):(a2) may be 10:90 to 99:1, preferably 10:90 to 90:10, more preferably 13:87 to 75:25, more preferably 16:84 to 60:40, or may be 40:60 to 20:80.

[0045] The polycarbonate resin (A) may be in the following forms: (A1) Polycarbonate resin containing a structural unit represented by formula (1) (A2) A blend of a polycarbonate resin containing a structural unit represented by formula (1) and a polycarbonate resin containing a structural unit represented by formula (2) (A3) Polycarbonate resin containing a structural unit represented by formula (1) and a structural unit represented by formula (2) (A4) A blend of a polycarbonate resin containing a structural unit represented by formula (1) and a polycarbonate resin containing a structural unit represented by formula (1) and a structural unit represented by formula (2). (A5) A blend of a polycarbonate resin containing a structural unit represented by formula (2) and a polycarbonate resin containing a structural unit represented by formula (1) and a structural unit represented by formula (2). (A6) A blend of a polycarbonate resin containing a structural unit represented by formula (1), a polycarbonate resin containing a structural unit represented by formula (2), and a polycarbonate resin containing a structural unit represented by formula (1) and a structural unit represented by formula (2). (A7) In the above (A1) to (A6), the polycarbonate resin or the polycarbonate resin constituting the blend thereof contains a structural unit represented by formula (1) and a structural unit other than the structural unit represented by formula (2). (A8) A blend of the polycarbonate resin or blend of any of the above (A1) to (A7) with a polycarbonate resin comprising other structural units.

[0046] The viscosity-average molecular weight (Mv) of the polycarbonate resin used in this embodiment preferably has a lower limit of 5,000 or more, more preferably 8,000 or more, even more preferably 10,000 or more, and even more preferably 12,000 or more. The upper limit of Mv is preferably 50,000 or less, more preferably 30,000 or less, even more preferably 29,000 or less, and even more preferably 27,000 or less. By setting the viscosity-average molecular weight at or above the lower limit, moldability is improved and molded articles with high mechanical strength can be obtained. By setting the viscosity-average molecular weight at or below the upper limit, the fluidity of the resin composition is improved, allowing for the efficient production of thin-walled molded articles. When the resin composition contains two or more polycarbonate resins, the viscosity-average molecular weight is the sum of the values ​​obtained by multiplying the viscosity-average molecular weight of each polycarbonate resin by its mass fraction. In particular, the viscosity-average molecular weight of a polycarbonate resin containing a structural unit represented by formula (1) is preferably 15,000 to 30,000. The viscosity average molecular weight of the polycarbonate resin containing the structural unit represented by formula (2) is preferably 12,000 to 28,000, and more preferably 18,000 to 27,000.

[0047] The viscosity average molecular weight (Mv) of a polycarbonate resin is calculated from the intrinsic viscosity (η) (unit: dL / g) at 20°C using an Ubbelohde viscometer with methylene chloride as a solvent, and then calculated using the following Schnell viscosity formula. η = 1.23 × 10 -4 Mv 0.83

[0048] The method for producing the polycarbonate resin used in the present invention 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.

[0049] Furthermore, the polycarbonate resin (particularly, a polycarbonate resin containing a structural unit represented by formula (2)) may be not only a virgin raw material but also a polycarbonate resin regenerated from used products (so-called material-recycled polycarbonate resin). Examples of the used products include optical recording media such as optical disks; light guide plates; transparent vehicle components such as automobile window glass, automobile headlamp lenses, and windshields; containers such as water bottles; eyeglass lenses; and building components such as soundproof walls, glass windows, and corrugated sheets. Also usable are crushed products obtained from non-conforming products, scraps, sprues, runners, etc., and pellets obtained by melting these. However, the material-recycled polycarbonate resin preferably accounts for 80% by mass or less, more preferably 60% by mass or less, and may even be 40% by mass or less of the polycarbonate resin contained in the resin composition. The lower limit of the content of the material-recycled polycarbonate resin may be 0% by mass of the polycarbonate resin contained in the resin composition, but is preferably 10% by mass or more from the viewpoint of environmental impact.

[0050] The content of polycarbonate resin in the resin composition of the present invention may be 94% by mass or more, or 95% by mass or more, or 96% by mass or more, based on 100% by mass of the resin composition. The upper limit of the content of polycarbonate resin in the resin composition of the present invention is the amount at which all components except the wax are polycarbonate resin. The resin composition of the present invention preferably does not contain more than 1 part by mass of organopolysiloxane per 100 parts by mass of (A) polycarbonate resin, and an upper limit may be set at less than 1 part by mass, less than 0.8 parts by mass, or less than 0.6 parts by mass of organopolysiloxane per 100 parts by mass of (A) polycarbonate resin.

[0051] <(B) Wax> The wax content in the resin composition of the present invention is more than 1.00 parts by mass and 4.00 parts by mass per 100 parts by mass of polycarbonate resin. The lower limit of the wax content can be preferably 1.05 parts by mass or more, 1.10 parts by mass or more, or 1.20 parts by mass or more per 100 parts by mass of polycarbonate resin. The upper limit of the wax content can be preferably 3.80 parts by mass or less, or 3.50 parts by mass or less per 100 parts by mass of polycarbonate resin. By including a predetermined amount of wax, water repellency and droplet removability can be effectively improved. The wax is not particularly limited, but is at least one wax selected from natural waxes, synthetic waxes, and waxes blended therewith. When two or more types of wax are included, the total amount is preferably within the above range.

[0052] Examples of natural waxes include vegetable waxes, animal waxes, mineral waxes, and petroleum waxes. Examples of vegetable waxes include candelilla wax, carnauba wax, rice wax, Japan wax, and jojoba oil. Examples of animal waxes include beeswax, lanolin, and spermaceti wax. Examples of mineral waxes include montan wax, ozokerite, and ceresin. Examples of petroleum waxes include paraffin wax, microcrystalline wax, and petrolatum. Of these, petroleum waxes are preferred from the viewpoint of color tone. These waxes may be used alone or in combination.

[0053] Synthetic waxes include synthetic hydrocarbons, modified waxes, hydrogenated waxes, fatty acids, acid amides, amines, imides, esters, and ketones. Well-known synthetic hydrocarbons include Fischer-Tropsch wax (also known as Sazoir wax) and polyethylene wax. Other examples include low-molecular-weight polymers (specifically, polymers with viscosity number average molecular weights of 500 to 20,000), such as polypropylene, ethylene-acrylic acid copolymer, polyethylene glycol, polypropylene glycol, and block or grafted polyethylene glycol and polypropylene glycol. Modified waxes include montan wax derivatives, paraffin wax derivatives, and microcrystalline wax derivatives. The derivatives referred to here are compounds obtained by refining, oxidation, esterification, saponification, or a combination thereof. Hydrogenated waxes include hydrogenated castor oil and hydrogenated castor oil derivatives. Polyethylene wax is preferred because it can effectively impart release properties with a small amount. These waxes may be used alone or in combination.

[0054] Among the above waxes, natural waxes such as paraffin wax and microcrystalline wax are particularly preferred from the viewpoint of improving water repellency and droplet removal. However, polyorganosiloxane may have lower sliding properties than wax, and the wax effect cannot be maximized, so it is better to suppress the content of polyorganosiloxane.

[0055] The melting point of the wax is not particularly limited, but is preferably 40 to 150° C., more preferably 45 to 120° C., even more preferably 50 to 100° C., and still more preferably 55 to 80° C. The melting point of the wax is more preferably 78° C. or lower, even more preferably 75° C. or lower, and may be 72° C. or lower or 70° C. or lower. The melting point of the wax can be measured according to JIS K 2235-2009.

[0056] <Stabilizer> The resin composition of the present invention may contain a stabilizer. Examples of stabilizers include heat stabilizers and antioxidants. A phosphorus-based stabilizer is preferably used as the heat stabilizer. 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.

[0057] As the antioxidant, 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.

[0058] 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 (registered trademark; the same applies hereinafter) AO-50" and "ADK STAB AO-60" manufactured by ADEKA Corporation.

[0059] The content of the stabilizer in the resin composition of the present invention 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, per 100 parts by mass of polycarbonate resin. By setting the content of the stabilizer within the above range, the effect of adding the stabilizer can be more effectively exhibited. The resin composition of the present invention may contain only one type of stabilizer, or may contain two or more types. When two or more types are contained, it is preferable that the total amount be within the above range.

[0060] <Other ingredients> In addition to the polycarbonate resin, wax, and optionally blended stabilizers, the resin composition of the present invention may contain other components as needed, as long as the desired physical properties are not significantly impaired. Examples of other components include other thermoplastic resins, reinforcing materials, and various resin additives. Examples of resin additives include ultraviolet absorbers, mold release agents, antistatic agents, flame retardants, flame retardant assistants, antifogging agents, antiblocking agents, flow improvers, plasticizers, dispersants, antibacterial agents, and impact modifiers. The resin additives may be contained alone or in any combination and ratio of two or more.

[0061] For details, please refer to paragraphs 0059 to 0080 of JP 2014-065901 A and paragraphs 0069 to 0093 of JP 2018-165017 A, the contents of which are incorporated herein by reference.

[0062] In particular, for ultraviolet absorbers, please refer to the descriptions in paragraphs

[0059] to

[0062] of JP 2016-216534 A, the contents of which are incorporated herein by reference. In particular, for 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. In particular, for flame retardants, please refer to the descriptions in paragraphs

[0068] to

[0075] of JP 2016-216534 A, the contents of which are incorporated herein by reference.

[0063] <Characteristics of resin composition> The resin composition of the present invention, when molded into a 2 mm thick plate, has a water contact angle of 95° or more and a sliding angle of less than 34°. The contact angle is an index of static water repellency, and the sliding angle is an index of dynamic water repellency and droplet removability. The resin composition of the present invention can also have the following properties.

[0064] The resin composition of the present invention has a water contact angle of 95° or more when molded into a 2 mm thick plate. This water contact angle is more preferably 98° or more, and even more preferably 100° or more. There is no particular limitation on the upper limit of the water contact angle, but it can be 130° or less, 125° or less, or 120° or less.

[0065] The resin composition of the present invention has a water sliding angle of less than 34° when molded into a flat plate with a thickness of 2 mm. This sliding angle is more preferably 33° or less, and may be 30° or less. The method for measuring the water sliding angle is as described in the Examples below.

[0066] The resin composition of the present invention can achieve low haze. When molded into a 2 mm thick plate, the resin composition of the present invention has a haze of 5.0% or less, and can be made 3.0% or less, or even 2.5% or less, 2.0% or less, 1.5% or less, or 1.0% or less. The ideal lower limit of haze is 0%, but a haze of 0.01% or more, or even 0.07% or more, is also practical. The haze is measured according to the method described in the Examples below.

[0067] The resin composition of the present invention can achieve high total light transmittance. For example, when the resin composition of the present invention is molded into a flat plate with a thickness of 2 mm, the total light transmittance can be 85% or more, and even 86% or more, and particularly 87% or more. The upper limit of the total light transmittance is ideally 100%, but a practical level is also 99% or less, or even 93% or less. The total light transmittance can be measured according to the method described in the Examples below.

[0068] <Method of manufacturing resin composition> The method for producing the resin composition of the present invention is not limited, and a wide variety of known methods for producing resin compositions can be used, including a method in which the (A) polycarbonate resin and (B) wax, as well as other components added as needed, are premixed using a mixer 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.

[0069] <Molded products> One form of the resin composition of the present invention is pellets. The resin composition or pellets described above can be molded into a molded article by various molding methods. That is, the molded article of the present invention is molded from the resin composition or pellets of the present invention.

[0070] 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, and examples thereof include film-like, rod-like, cylindrical, ring-like, circular, elliptical, polygonal, irregularly shaped, hollow, frame-like, box-like, panel-like, etc. Among these, panel-like shapes are preferred, and the thickness is, for example, about 1 mm to 5 mm.

[0071] 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 the present invention 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 the present invention is not limited to molded articles obtained by these methods.

[0072] The molded article of the present invention can be used for display parts, mobile information terminal parts, household electrical appliance parts, or indoor furniture parts, etc. The molded article of the present invention is suitably used for parts for electrical and electronic devices, office automation equipment, mobile information terminals, machine parts, home appliances, vehicle parts, various containers, lighting equipment, stationery, office supplies, etc. Among these, it is particularly used for housings for electrical and electronic devices, office automation equipment, information terminal devices, and home appliances, lighting equipment, and vehicle parts (particularly vehicle interior parts), and vehicle interior parts are particularly suitable. [Example]

[0073] The present invention will be explained in more detail below with reference to examples. The materials, amounts used, ratios, treatment contents, treatment procedures, etc. shown in the following examples can be changed as appropriate 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.

[0074] 1.Raw materials The following raw materials were used:

[0075] (A)PC resin (A1) Aromatic polycarbonate resin produced in Production Example 1 Viscosity average molecular weight Mv:26,000 (A2) Mitsubishi Chemical Corporation, trade name: XANTAR (registered trademark) 7022PJ Aromatic polycarbonate resin made from bisphenol A Viscosity average molecular weight Mv:21,000

[0076] (B) Wax (B1) Petroleum wax, paraffin wax, manufactured by Nippon Seiro Co., Ltd. Product name: Paraffin Wax-140, melting point: 61°C (B2) Petroleum wax paraffin wax manufactured by Nippon Seiro Co., Ltd. Product name: Paraffin Wax-155, melting point: 69°C (B3) Petroleum wax microcrystalline wax manufactured by Nippon Seiro Co., Ltd. Product name: Hi-Mic-2065, melting point: 75℃ (B4) Fischer-Tropsch wax, synthetic wax manufactured by Nippon Seiro Co., Ltd. Product name: FT115H, Melting point: 113℃ (B5) Clariant Synthetic Wax Polyethylene Wax Product name: Licowax PE520, Melting point: 117-123°C (B6) Clariant Synthetic Wax Polyethylene Wax Product name: Licowax PE520, Melting point: 117-123°C

[0077] (C) Stabilizer (C1) ADEKA Corporation Product name: ADK STAB AO60 Phenolic antioxidant Tetrakis-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate (C2) ADEKA Corporation Product name: ADK STAB 2112 Phosphite stabilizer Tris(2,4-di-tert-butylphenyl) phosphite

[0078] <Production Example 1: Production of Polycarbonate Resin A1> 26.14 moles (6.75 kg) of bisphenol C (BPC) and 26.79 moles (5.74 kg) of diphenyl carbonate were placed in an aluminum (SUS) reactor (internal volume 10 L) equipped with a stirrer and a distillate condenser. After the reactor was purged with nitrogen gas, the temperature was raised to 220°C in a nitrogen gas atmosphere over 30 minutes. Next, the reaction solution in the reactor was stirred, and cesium carbonate (Cs2CO3) was added as a transesterification catalyst to the molten reaction solution at a ratio of 1.5 x 10 per mole of BPC. -6The reaction mixture was stirred and fermented under a nitrogen gas atmosphere at 220°C for 30 minutes. The pressure in the reactor was then reduced to 100 Torr over 40 minutes at the same temperature, and the reaction continued for another 100 minutes to distill off phenol. The temperature in the reactor was then increased to 284°C over 60 minutes, and the pressure was reduced to 3 Torr, distilling off almost the entire theoretical amount of phenol. The pressure in the reactor was then maintained at less than 1 Torr at the same temperature, and the reaction continued for another 60 minutes to complete the polycondensation reaction. The stirring speed of the stirrer was 38 rpm, the reaction mixture temperature just before the end of the reaction was 289°C, and the stirring power was 1.00 kW. Next, the reaction liquid in a molten state was fed into a twin-screw extruder, and butyl p-toluenesulfonate in an amount four times the molar amount of cesium carbonate was fed into the first feed port of the twin-screw extruder and kneaded with the reaction liquid. Thereafter, the reaction liquid was extruded into strands through the die of the twin-screw extruder and cut with a cutter to obtain pellets of polycarbonate resin.

[0079] <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

[0080] 2. Examples 1 to 9 and Comparative Examples 1 to 10 <Compound> The components of the raw materials described above were mixed in the amounts shown in Tables 1 and 2 (all parts by mass) in a tumbler mixer for 20 minutes, and then fed into a TEM26SX manufactured by Shibaura Machine Co., Ltd. equipped with one vent, and kneaded under conditions of a screw rotation speed of 180 rpm, a discharge rate of 25 kg / hour, and a barrel temperature of 260°C. The molten resin composition extruded in the form of strands was quenched in a water bath and pelletized using a pelletizer to obtain pellets of the resin composition.

[0081] <Water contact angle measurement> The resin composition pellets were dried at 100°C for 5 hours and then injection-molded into flat plates (90mm x 50mm x 2mm thick) using an injection molding machine (Shibaura Machine Co., Ltd. "EC50SXII") at a cylinder 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 plates, 1.0µL of ion-exchanged water was dropped onto them using a microsyringe to measure the contact angle. The measurement device used was a DropMaster 300 solid-liquid interface analyzer manufactured by Kyowa Interface Science.

[0082] <Measurement of sliding angle> The resin composition pellets were dried at 100°C for 5 hours and then injection-molded into flat plates (90mm x 50mm x 2mm thick) using an injection molding machine (Shibaura Machine Co., Ltd. "EC50SXII") at a cylinder 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 plate, a 20µL droplet of ion-exchanged water was added using a microsyringe. The solid sample was gradually tilted, and the tilt angle (sliding angle) at which the droplet began to slide downward was measured. The measurement device used was a DM-501 solid-liquid interface analyzer manufactured by Kyowa Interface Science.

[0083] <Haze and total light transmittance measurements> The resin composition pellets were dried at 100°C for 5 hours and then injection-molded into flat plates (90mm x 50mm x 2mm thick) using an injection molding machine (Shibaura Machine Co., Ltd., "EC50SXII") at a cylinder temperature of 280°C, a mold temperature of 70°C, a screw rotation speed of 100 rpm, and an injection speed of 25mm / s. The haze (unit: %) and total light transmittance (unit: %) of the resulting plates were measured using a spectral transmittance measuring device. The spectral transmittance measuring device used was an SH-7000 manufactured by Nippon Denshoku Industries Co., Ltd.

[0084] <Water droplet removal evaluation> The resin composition pellets were dried at 100°C for 5 hours, and then injection molded into flat plates (90mm x 50mm x 2mm thick) using an injection molding machine (Shibaura Machine Co., Ltd. "EC50SXII") under conditions of a cylinder setting temperature of 280°C, a mold temperature of 70°C, a screw rotation speed of 100 rpm, and an injection speed of 25mm / s. The plate was immersed in a container filled with ion-exchanged water, and the state of droplets remaining on the surface of the plate when it was removed from the ion-exchanged water was observed. The above evaluation method was repeated three times. ○: No water droplets on any of the three occasions ×: Water droplets form at least once

[0085] The evaluation results are shown in Tables 1 and 2. In the tables, the extrudability (gas generation evaluation) is judged as ◯ when there is little gas generation and extrudability is easy, and judged as × when there is much gas generation and extrudability is not easy.

[0086] [Table 1]

[0087] [Table 2]

[0088] As is clear from the above results, the resin composition of the present invention was able to provide molded articles excellent in water repellency, extrudability, transparency, and water droplet removability. In contrast, when the amount of wax added was small (Comparative Examples 1, 2, and 4), it was confirmed that the water repellency and water droplet removability were poor. When the amount of wax added was large (Comparative Example 3), it was confirmed that the extrudability was poor and stable production was not possible. When A1 was not included (Comparative Example 5), it was confirmed that the transparency was poor. Furthermore, it was confirmed that Comparative Examples 6 to 10 were poor in water repellency, transparency, and water droplet removability. [Industrial Applicability]

[0089] The resin composition and molded article of the present invention can be widely used in various fields such as the electric and electronic equipment field and the automotive field, and is therefore industrially useful.

Claims

1. (A) a polycarbonate resin; and (B) a wax, The wax (B) is contained in an amount of more than 1.00 parts by mass and not more than 4.00 parts by mass per 100 parts by mass of the polycarbonate resin (A), The polycarbonate resin (A) contains a structural unit represented by the following formula (1): The resin composition has a water contact angle of 95° or more and a sliding angle of less than 34° when molded into a flat plate having a thickness of 2 mm. 【Chemical 1】 In formula (1), R 1 represents a methyl group, R 2 represents a hydrogen atom or a methyl group, and X 1 represents a group represented by the following formula (1-a) or (1-b). 【Chemistry 2】 In formula (1-a) and formula (1-b), R 3 and R 4 each independently represents a hydrogen atom or a methyl group; Z 1 represents a group which 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 wax has a melting point of 80°C or lower.

3. The resin composition according to claim 1 , wherein the wax is a natural wax.

4. The resin composition according to claim 1, wherein the polycarbonate resin (A) further contains at least one structural unit represented by the following formula (2): 【Chemistry 3】 In formula (2), X 2 represents a group represented by the following formula (2-a) or (2-b). 【Chemistry 4】 In formulas (2-a) and (2-b), R 5 and R 6 each independently represents a hydrogen atom or a methyl group; Z 2 represents a group which bonds with C to form an alicyclic hydrocarbon having 6 to 12 carbon atoms which may have a substituent.

5. The resin composition according to claim 4, wherein the mass ratio of the structural unit represented by formula (1) to the structural unit represented by formula (2) in the polycarbonate resin (A) is 10:90 to 99:

1.

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

7. 7. The molded article according to claim 6, which is a display part, a mobile information terminal part, a home appliance part, or an interior furniture part.

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