Resin composition, pellet, and molded article

Abstract

The invention provides a resin composition, pellets and a molded article. Provided is a resin composition containing, per 100% by mass of the resin composition, 80-99% by mass of (A) a polycarbonate resin and 1-20% by mass of (B) an elastomer containing a styrene unit in a ratio of (50)% by mass or more of all structural units, the (A) polycarbonate resin containing a structural unit represented by formula (1) in a ratio of 8 mol% or more of all structural units. In formula (1), R1 represents a methyl group, and R2 represents a hydrogen atom or a methyl group. Formula (1) # imgabs0 #

Description

Technical Field

[0001] The present invention relates to a resin composition, a pellet and a molded product. Background Art

[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 electric and electronic equipment field and the automobile field.

[0003] However, bisphenol A type polycarbonate resin has the problems of high melt viscosity and poor molding processability. For polymer alloys with acrylonitrile-butadiene-styrene resin (hereinafter also referred to as ABS resin), the moldability can be improved compared with the case of polycarbonate resin alone, and the impact resistance and heat resistance can be improved compared with the case of ABS resin alone. Therefore, as a material having strength, heat resistance and moldability, it is widely used in various fields including the automotive field, electrical and electronic equipment field, etc.

[0004] On the other hand, in recent years, the thinning and weight reduction of products have been rapidly progressing, and the demand for simplifying the manufacturing process and omitting the painting process has increased. In conjunction with this, the performance of the molding materials is required to be further improved, and high hardness is particularly desired.

[0005] However, polycarbonate resins and ABS resin compositions have a problem in that the surface hardness of molded articles is low.

[0006] In order to solve the above problems, a polycarbonate resin composition is disclosed, which comprises a bisphenol A polycarbonate resin (A), a bisphenol C polycarbonate resin (B), a styrene resin (C) containing no structural unit derived from butadiene, and a graft copolymer (D) having a polyethylene chain segment and a vinyl polymer chain segment. The polycarbonate resin composition is characterized in that the content ratio of the polycarbonate resin (A) to the polycarbonate resin (B) is 0 to 80 / 20 to 100 in terms of the mass ratio of (A) / (B), the content of the styrene resin (C) containing no structural unit derived from butadiene is 1 to 30 parts by mass relative to 100 parts by mass of the total of the polycarbonate resins (A) and (B), and the content of the graft copolymer (D) is 1 to 10 parts by mass relative to 100 parts by mass of the total of the polycarbonate resins (A) and (B).

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: Japanese Patent Application Publication No. 2019-135291 Summary of the invention

[0010] Problems to be solved by the invention

[0011] The resin composition described in Patent Document 1 can produce a molded product having excellent impact resistance and hardness. However, transparency is sometimes required depending on the application. In addition, the present inventors have conducted research and found that if an elastomer is mixed with the bisphenol C type polycarbonate resin, the transparency may be deteriorated.

[0012] An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a resin composition, a pellet, and a molded article. The resin composition can provide a molded article having excellent impact resistance, excellent hardness, and excellent transparency.

[0013] Means for solving problems

[0014] The present inventors have conducted studies based on the above problems and have solved the above problems by blending a predetermined elastomer into a polycarbonate resin such as a bisphenol C polycarbonate resin.

[0015] Specifically, the above-mentioned problems were solved by the following means.

[0016] <1> A resin composition, wherein, in 100% by mass of the resin composition, the resin composition comprises:

[0017] (A) 80% to 99% by mass of a polycarbonate resin; and

[0018] (B) 1 to 20% by mass of an elastomer containing styrene units in a ratio of 50% by mass or more of all structural units,

[0019] The polycarbonate resin (A) contains the structural unit represented by the formula (1) in a ratio of 8 mol % or more of all structural units.

[0020] Formula (1)

[0021] [Chemistry 1]

[0022]

[0023] (In formula (1), R 1 Represents methyl, R 2 represents a hydrogen atom or a methyl group, X 1 represents any of the following,

[0024] [Chemistry 2]

[0025]

[0026] R 3 and R 4 Each independently represents a hydrogen atom or a methyl group, and Z represents a group that is bonded to C to form an alicyclic hydrocarbon group having 6 to 12 carbon atoms and may have a substituent.

[0027] <2> like <1> The resin composition described above, wherein the polycarbonate resin (A) contains the unit represented by formula (1) in a proportion of less than 50 mol % of all structural units.

[0028] <3> like <1> or <2> The resin composition, wherein R in the structural unit represented by formula (1) 2 is a hydrogen atom, X 1 By -C(R 3 )(R 4 )-express.

[0029] <4> like <1> ~ <3> The resin composition described above further comprises a colorant.

[0030] <5> like <1> ~ <4> The resin composition described in any one of the above aspects, wherein the content of the colorant is 0.001 to 5 parts by mass based on 100 parts by mass of the polycarbonate resin (A).

[0031] <6> like <1> ~ <5> The resin composition described above, wherein the elastomer (B) comprises high impact polystyrene.

[0032] <7> like <1> ~ <5> The resin composition described above, wherein the (B) elastomer comprises high-impact polystyrene, and the high-impact polystyrene comprises styrene units in a ratio of 85% by mass or more of all structural units.

[0033] <8> like <1> ~ <7> The resin composition described in any one of the preceding claims, wherein the polycarbonate resin (A) contains the unit represented by formula (1) in a ratio of less than 50 mol % of all structural units,

[0034] R in the structural unit represented by formula (1) 2 is a hydrogen atom, X 1 By -C(R 3 R 4 )-express,

[0035] The resin composition further comprises a colorant,

[0036] The content of the colorant is 0.001 to 5 parts by mass based on 100 parts by mass of the polycarbonate resin (A).

[0037] The (B) elastomer includes high impact polystyrene.

[0038] <9> like <1> ~ <7> The resin composition described in any one of the preceding claims, wherein the polycarbonate resin (A) contains the unit represented by formula (1) in a ratio of less than 50 mol % of all structural units,

[0039] R in the structural unit represented by formula (1) 2 is a hydrogen atom, X 1 By -C(R 3 R 4 )-express,

[0040] The resin composition further comprises a colorant,

[0041] The content of the colorant is 0.001 to 5 parts by mass based on 100 parts by mass of the polycarbonate resin (A).

[0042] The (B) elastomer includes high-impact polystyrene, and the high-impact polystyrene includes styrene units in a ratio of 85% by mass or more of all structural units.

[0043] <10> A pellet, which is <1> ~ <9> Pellets of the resin composition described above.

[0044] <11> A molded product, comprising <1> ~ <9> The resin composition described in any one of the above is molded.

[0045] <12> A molded product, comprising <10> The granules are formed.

[0046] Effects of the Invention

[0047] According to the present invention, a resin composition, a pellet, and a molded article can be provided, wherein the resin composition can provide a molded article having excellent impact resistance, excellent hardness, and excellent transparency. DETAILED DESCRIPTION

[0048] Hereinafter, a specific embodiment of the present invention (hereinafter referred to as "this embodiment") will be described in detail. It should be noted that the following this embodiment is an example for explaining the present invention, and the present invention is not limited to this embodiment.

[0049] In addition, in this specification, "to" is used to mean that the numerical values ​​described before and after it are included as a lower limit and an upper limit.

[0050] In this specification, various physical property values ​​and characteristic values ​​are values ​​at 23° C. unless otherwise specified.

[0051] In this specification, unless otherwise specified, the weight average molecular weight and the number average molecular weight are polystyrene-equivalent values ​​measured by GPC (gel permeation chromatography).

[0052] When the measurement methods and the like described in the standards shown in this specification differ by year, unless otherwise specified, they are based on the standards as of January 1, 2022.

[0053] The resin composition of the present embodiment is characterized in that, in 100% by mass of the resin composition, it contains 80% to 99% by mass of (A) a polycarbonate resin and 1% to 20% by mass of (B) an elastomer containing styrene units in a ratio of (50)% by mass or more of all structural units, and the above-mentioned (A) polycarbonate resin contains the structural unit represented by formula (1) in a ratio of 8 mol% or more of all structural units.

[0054] Formula (1)

[0055] [Chemistry 3]

[0056]

[0057] (In formula (1), R 1 Represents methyl, R 2 represents a hydrogen atom or a methyl group, X 1 represents any of the following,

[0058] [Chemistry 4]

[0059]

[0060] R 3 and R 4 Each independently represents a hydrogen atom or a methyl group, and Z represents a group that is bonded to C to form an alicyclic hydrocarbon group having 6 to 12 carbon atoms and may have a substituent.

[0061] By adopting the above-mentioned configuration, it is possible to obtain a resin composition capable of providing a molded article having excellent impact resistance, excellent hardness, and excellent transparency.

[0062] That is, by using a polycarbonate resin such as a bisphenol C-type polycarbonate resin that contains the structural unit represented by formula (1) in a ratio of 8 mol% or more of all structural units (hereinafter sometimes simply referred to as "polycarbonate resin containing the structural unit represented by formula (1)"), a molded product with excellent hardness can be obtained.

[0063] Furthermore, when an elastomer is blended with a polycarbonate resin containing the structural unit represented by formula (1), the impact resistance of the obtained molded article is improved.

[0064] However, it is known that if an elastomer is mixed with a polycarbonate resin containing a structural unit represented by formula (1), the transparency of the obtained molded product deteriorates depending on the type of the elastomer. Furthermore, even if a molded product is mixed with a colorant, when it is molded from a resin composition with poor transparency, the color rendering properties originally possessed by the colorant cannot be fully realized. For example, if a black dye is mixed with a resin composition with poor transparency, the molded product will have a gray color.

[0065] Furthermore, the present inventors have conducted research and found that by using (B) an elastomer containing styrene units at a ratio of 50% by mass or more of all structural units, the high transparency inherent in the polycarbonate resin containing the structural unit represented by formula (1) can be maintained. The reason for this is presumably that by using an elastomer having a high ratio of styrene units, the refractive index difference with the polycarbonate resin containing the structural unit represented by formula (1) becomes small, and the high transparency inherent in the polycarbonate resin containing the structural unit represented by formula (1) can be maintained.

[0066] Hereinafter, the present invention will be described in detail.

[0067] <(A) Polycarbonate resin>

[0068] The resin composition of the present embodiment contains (A) a polycarbonate resin.

[0069] The polycarbonate resin (A) contains the structural unit represented by formula (1) in a ratio of 8 mol% or more of all structural units. By containing the structural unit represented by formula (1), a molded article having excellent transparency and hardness can be obtained.

[0070] Formula (1)

[0071] [Chemistry 5]

[0072]

[0073] (In formula (1), R 1 Represents methyl, R 2 represents a hydrogen atom or a methyl group, X 1 represents any of the following,

[0074] [Chemistry 6]

[0075]

[0076] R 3 and R 4 Each independently represents a hydrogen atom or a methyl group, and Z represents a group that is bonded to C to form an alicyclic hydrocarbon group having 6 to 12 carbon atoms and may have a substituent.

[0077] In the structural unit represented by formula (1), R 2 Preferred is a hydrogen atom.

[0078] In formula (1), X 1 for

[0079] [Chemistry 7]

[0080] In the case of R 3 and R 4Preferably at least one of them is a methyl group, and more preferably both of them are methyl groups.

[0081] In addition, X 1 for

[0082] [Chemistry 8]

[0083] In the case of, Z is bonded to the carbon C bonded to the two phenyl groups 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 cyclohexylidene, cycloheptylidene, cyclododecylidene, adamantylidene, and cyclododecylidene. Examples of alicyclic hydrocarbons having a substituent formed by bonding Z to C include methyl substitutions and ethyl substitutions of the above alicyclic hydrocarbon groups. Examples of substituted groups include groups having methyl substituents and ethyl substituents. Among these, cyclohexylidene, methyl substitutions of cyclohexylidene (preferably 3,3,5-trimethyl substitutions), and cyclododecylidene are preferred.

[0084] In formula (1), X 1 The following structure is preferred.

[0085] [Chemistry 9]

[0086]

[0087] A preferred specific example of the structural unit represented by the above formula (1) is a structural unit composed of 2,2-bis(3-methyl-4-hydroxyphenyl)propane, that is, bisphenol C (carbonate structural unit).

[0088] In the present embodiment, the polycarbonate resin may contain only one type of the structural unit represented by formula (1), or may contain two or more types.

[0089] In the present embodiment, the polycarbonate resin containing the structural unit represented by formula (1) may further contain the structural unit represented by formula (2). Here, containing the structural unit represented by formula (2) means that, in addition to the polycarbonate resin contained in the resin composition of the present embodiment being a polycarbonate resin containing the structural unit represented by formula (1) and the structural unit represented by formula (2), it may also be a blend of a polycarbonate resin containing the structural unit represented by formula (1) and a polycarbonate resin containing the structural unit represented by formula (2). By including the structural unit represented by formula (2), there is a tendency that the heat resistance of the obtained molded article is further improved.

[0090] Formula (2)

[0091] [Chemistry 10]

[0092]

[0093] In formula (2), X 2 represents any of the following,

[0094] [Chemistry 11]

[0095]

[0096] R 3 and R 4 Each independently represents a hydrogen atom or a methyl group, and Z represents a group which bonds to C to form an alicyclic hydrocarbon which may have a substituent and has 6 to 12 carbon atoms.

[0097] In formula (2), X 2 for

[0098] [Chemistry 12]

[0099] In the case of R 3 and R 4 Preferably at least one of them is a methyl group, and more preferably both of them are methyl groups.

[0100] In addition, X 2 for

[0101] [Chemistry 13]

[0102] In the case of Z, the carbon C bonded to the two phenyl groups in the above formula (2) forms a divalent alicyclic hydrocarbon group having 6 to 12 carbon atoms. Examples of the divalent alicyclic hydrocarbon group include cyclohexylidene, cycloheptylidene, cyclododecylidene, adamantylidene, cyclododecylidene and other cycloalkylidene groups. Examples of substituted groups include groups having methyl substituents and ethyl substituents. Among these, cyclohexylidene, methyl substituted cyclohexylidene (preferably 3,3,5-trimethyl substituted cyclohexylidene) and cyclododecylidene are preferred.

[0103] In formula (2), X 2 The following structure is preferred.

[0104] [Chemistry 14]

[0105]

[0106] In the present embodiment, the polycarbonate resin may contain only one type of the structural unit represented by formula (2), or may contain two or more types.

[0107] In the present embodiment, the polycarbonate resin may contain other structural units other than the structural unit represented by formula (1) and the structural unit represented by formula (2). As other structural units, structural units derived from dihydroxy compounds shown below can be exemplified.

[0108] 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 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-3,5-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-cyclohexylphenyl)-1-phenylethane, 1,1-bis(4-hydroxy-3-cyclohexylphenyl)-1-phenylethane, 1,1-bis(4-hydroxy-3-(1-methylpropyl)phenyl)-1-phenylethane -3-phenylphenyl)-1-phenylethane, 1,1-bis(4-hydroxyphenyl)cyclopentane, 1,1-bis(4-hydroxyphenyl)cyclooctane, 4,4'-(1,3-phenylene diisopropylidene)bisphenol, 4,4'-(1,4-phenylene diisopropylidene)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.

[0109] In addition, as an embodiment of other structural units, reference can be made to the structural unit represented by formula (2) described in paragraph 0008 of International Publication No. 2017 / 099226, the description in paragraphs 0043 to 0052 of International Publication No. 2017 / 099226, and the description in Japanese Patent Publication No. 2011-046769, and these contents are incorporated into this specification.

[0110] In addition, in the polycarbonate resin (A) used in the present embodiment, the proportion of the structural unit represented by formula (1) in all structural units is 8 mol% or more, preferably 10 mol% or more, more preferably 12 mol% or more, and further preferably 14 mol% or more, and may be 35 mol% or more, 40 mol% or more, 50 mol% or more, 70 mol% or more, or 75 mol% or more, depending on the application. By being above the above lower limit, the transparency of the obtained molded product tends to be further improved, and the surface hardness of the molded product tends to be improved. In addition, the proportion of the structural unit represented by the above formula (1) in all structural units may be 100 mol%, preferably 95 mol% or less, and may be 80 mol% or less, 70 mol% or less, 50 mol% or less, less than 50 mol%, 40 mol% or less, 30 mol% or less, 26 mol% or less, or 20 mol% or less, depending on the application. By being below the above upper limit, the impact resistance of the obtained molded product tends to be further improved, and the heat resistance of the molded product tends to be improved. Furthermore, by being equal to or less than the above upper limit, weather resistance tends to be improved.

[0111] The total of the structural units represented by the above formula (1) and the structural units represented by the formula (2) in the polycarbonate resin used in the present embodiment preferably accounts for 90% by mass or more of all structural units excluding the terminal groups, more preferably accounts for 95% by mass or more, and further preferably accounts for 99% by mass or more. The upper limit of the above total is 100% by mass or less.

[0112] The polycarbonate resin used in the present embodiment is preferably in the following aspects.

[0113] (A1) A polycarbonate resin comprising a structural unit represented by formula (1)

[0114] (A2) A blend of a polycarbonate resin comprising a structural unit represented by formula (1) and a polycarbonate resin comprising a structural unit represented by formula (2)

[0115] (A3) A polycarbonate resin comprising a structural unit represented by formula (1) and a structural unit represented by formula (2)

[0116] (A4) A blend of a polycarbonate resin comprising a structural unit represented by formula (1) and a polycarbonate resin comprising a structural unit represented by formula (1) and a structural unit represented by formula (2)

[0117] (A5) A blend of a polycarbonate resin comprising a structural unit represented by formula (2) and a polycarbonate resin comprising a structural unit represented by formula (1) and a structural unit represented by formula (2)

[0118] (A6) A blend of a polycarbonate resin comprising a structural unit represented by formula (1), a polycarbonate resin comprising a structural unit represented by formula (2), and a polycarbonate resin comprising a structural unit represented by formula (1) and a structural unit represented by formula (2)

[0119] (A7) In the above (A1) to (A6), the polycarbonate resin or the polycarbonate resin constituting the blend thereof contains a polycarbonate resin having a structural unit other than the structural unit represented by the formula (1) and the structural unit represented by the formula (2).

[0120] (A8) A blend of the polycarbonate resin or blend of the above (A1) to (A7) and a polycarbonate resin containing other structural units

[0121] The lower limit of the viscosity average molecular weight (Mv) of the (A) polycarbonate resin used in the present embodiment is preferably 5,000 or more, more preferably 8,000 or more, further preferably 10,000 or more, further preferably 12,000 or more. The upper limit of Mv is preferably 32,000 or less, more preferably 30,000 or less, further preferably 29,000 or less, further preferably 27,000 or less.

[0122] By making the viscosity average molecular weight above the above lower limit, the moldability can be improved, and a molded product with high mechanical strength can be obtained. In addition, by being below the above upper limit, the fluidity of the resin composition is improved, and even a thin-walled molded product can be effectively manufactured.

[0123] When the resin composition contains two or more types of (A) polycarbonate resins, it is the sum of the values ​​obtained by multiplying the viscosity average molecular weight of each polycarbonate resin by the mass fraction.

[0124] In particular, the viscosity average molecular weight of the polycarbonate resin containing the structural unit represented by formula (1) is preferably 20,000 to 30,000, more preferably 20,000 to 28,000. The viscosity average molecular weight of the polycarbonate resin containing the structural unit represented by formula (2) is preferably 12,000 to 28,000, more preferably 18,000 to 27,000.

[0125] The viscosity average molecular weight (Mv) of the polycarbonate resin was calculated from the following Schnell viscosity formula by determining the intrinsic viscosity (η) (unit: dL / g) at 20° C. using an Ubbelohde viscometer using methylene chloride as a solvent.

[0126] η=1.23×10 -4 Mv 0.83

[0127] The polycarbonate resin (A) used in the present embodiment (all polycarbonate resins including the structural unit represented by formula (1) and the structural unit represented by formula (2)) may have a pencil hardness of 3B to 2H, preferably 2B to 2H, as measured in accordance with ISO 15184. The pencil hardness is measured by the method described in Examples below.

[0128] In particular, the pencil hardness of the polycarbonate resin containing the structural unit represented by the formula (1) is preferably H to 2H, and the pencil hardness of the polycarbonate resin containing the structural unit represented by the formula (2) is preferably 2B to HB.

[0129] The pencil hardness was measured according to the description in the Examples described below.

[0130] The method for producing the polycarbonate resin used in the present embodiment is not particularly limited, and for example, the description in paragraphs 0027 to 0043 and Examples of JP-A-2014-065901 may be referred to, and the contents thereof are incorporated herein.

[0131] The content of the polycarbonate resin (A) in the resin composition of the present embodiment is 80% by mass or more, preferably 82% by mass or more, more preferably 84% by mass or more, and further preferably 86% by mass or more, and further preferably 88% by mass or more in 100% by mass of the resin composition. By being above the above lower limit, there is a tendency that the heat resistance of the obtained molded article is further improved. In addition, the content of the polycarbonate resin (A) in the resin composition of the present embodiment is 99% by mass or less, preferably 98% by mass or less, and can also be 97% by mass or less in 100% by mass of the resin composition.

[0132] <(B) Elastomer containing styrene units in a ratio of 50% by mass or more of all structural units>

[0133] The resin composition of the present embodiment includes (B) an elastomer containing styrene units at a ratio of 50% by mass or more of all structural units (hereinafter sometimes referred to as "(B) elastomer"). By using an elastomer having a high ratio of styrene units, the impact resistance of the obtained molded article and the high transparency inherent in the polycarbonate resin containing the structural unit represented by formula (1) can be maintained.

[0134] In the present embodiment, the ratio of the styrene unit in (B) elastomer (preferably high impact polystyrene) is preferably 50% by mass or more, more preferably 60% by mass or more, more preferably 70% by mass or more, and further preferably 80% by mass or more, and further preferably 85% by mass or more in all structural units, and is preferably 99% by mass or less, more preferably 98% by mass or less, further preferably 96% by mass or less, and further preferably 94% by mass or less, and further preferably 92% by mass or less. By being below the above upper limit, there is a tendency that the impact resistance of the obtained molded article is further improved. In addition, by being above the above lower limit, there is a tendency that the transparency of the obtained molded article is further improved.

[0135] The (B) elastomer in the present embodiment preferably comprises high impact polystyrene (HIPS, impact resistant polystyrene). HIPS is a polymer formed by dispersing a rubber-like polymer composed of butadiene rubber and the like in a granular state in a matrix composed of an aromatic vinyl polymer such as polystyrene. HIPS can be obtained, for example, by dissolving a rubber-like polymer in a mixed solution of an aromatic vinyl monomer and an inactive solvent and stirring to perform bulk polymerization, suspension polymerization, solution polymerization, etc. In addition, HIPS can also be a mixture formed by mixing a polymer obtained by dissolving a rubber-like polymer in a mixed solution of an aromatic vinyl monomer and an inactive solvent with an aromatic vinyl polymer obtained separately.

[0136] The high-impact polystyrene preferably contains styrene units in a ratio of 85% by mass or more of all structural units.

[0137] By using a high-impact polystyrene having a high proportion of styrene, the refractive index is close to that of the polycarbonate resin, and the transparency of the resin composition can be improved. In addition, the compatibility with the polycarbonate resin containing the structural unit shown in formula (1) is improved, and the transparency of the resin composition can be improved. In particular, by using a high-impact polystyrene having a high proportion of styrene and a polycarbonate resin containing the structural unit shown in formula (1) in combination, the transparency of the obtained resin composition can be further improved.

[0138] In addition, by mixing a colorant into such a highly transparent resin composition, the color tone of the colorant can be appropriately expressed. In particular, by mixing a black colorant, the jet black property can be further improved.

[0139] In addition, high-impact polystyrene having a high styrene content can achieve good impact resistance despite being an elastomer having a small rubber component, due to its good compatibility with the polycarbonate resin containing the structural unit represented by formula (1).

[0140] In HIPS, there is no particular restriction on the matrix portion composed of an aromatic vinyl polymer, and the mass average molecular weight in terms of polystyrene measured by GPC (gel permeation chromatography) at 135° C. using trichlorobenzene as a solvent is preferably 100,000 or more, more preferably 150,000 or more. In addition, there is no particular restriction on the average particle size of the rubber-like polymer, but generally 0.4 μm to 6.0 μm is appropriate.

[0141] The content of the elastomer (B) in the resin composition of the present embodiment is 1% by mass or more, preferably 2% by mass or more, and more preferably 3% by mass or more in 100% by mass of the resin composition. By being above the above lower limit, there is a tendency that the impact resistance of the obtained molded product is further improved. In addition, the content of the elastomer (B) in the resin composition of the present embodiment is 20% by mass or less, preferably 18% by mass or less, more preferably 16% by mass or less, and further preferably 14% by mass or less, and more preferably 12% by mass or less in 100% by mass of the resin composition. By being below the above upper limit, there is a tendency to further improve the poor appearance of the obtained molded product.

[0142] The resin composition of the present embodiment may contain only one type of (B) elastomer, or may contain two or more types. When containing two or more types, the total amount is preferably within the above range.

[0143] As one aspect of the resin composition of the present embodiment, the resin composition may be configured to substantially not contain an elastomer other than HIPS. Substantially not containing means that, among the elastomer (B) contained in the resin composition, the content of the elastomer other than HIPS is less than 10% by mass of the content of the elastomer (B), preferably less than 5% by mass, more preferably less than 3% by mass, and further preferably less than 1% by mass.

[0144] <Ultraviolet light absorber>

[0145] The resin composition of the present embodiment may contain an ultraviolet absorber.

[0146] Preferred examples of the ultraviolet absorber include benzotriazole ultraviolet absorbers, benzoxazine ultraviolet absorbers, triazine ultraviolet absorbers, and malonate ultraviolet absorbers, and benzotriazole ultraviolet absorbers are preferred.

[0147] Examples of the benzotriazole ultraviolet absorber include 2-(2-hydroxy-5-methylphenyl)-2H-benzotriazole, 2-(2-hydroxy-3,5-di-tert-butylphenyl)-2H-benzotriazole, 2-(2-hydroxy-3-tert-butyl-5-methylphenyl)-2H-benzotriazole, 2-(2-hydroxy-5-tert-octylphenyl)-2H-benzotriazole, 2-(3,5-di-tert-octyl-2-hydroxyphenyl)-2H-benzotriazole, 2-(3,5-di-tert-amyl-2-hydroxyphenyl)-2H-benzotriazole, and 2-(3 -lauryl-5-methyl-2-hydroxyphenyl)-2H-benzotriazole, 2-(3,5-di-tert-butyl-2-hydroxyphenyl)-5-chloro-2H-benzotriazole, 2-(3-tert-butyl-5-methyl-2-hydroxyphenyl)-5-chloro-2H-benzotriazole, 2-(3,5-bis(1-methyl-1-phenylethyl)-2-hydroxyphenyl)-2H-benzotriazole, bis(3-(2H-benzotriazol-2-yl)-2-hydroxy-5-methylphenyl)methane, bis(3-(2H-benzotriazol-2-yl)-2-hydroxy-5 -(1,1,3,3-tetramethylbutyl)phenyl)methane, bis(3-(2H-benzotriazol-2-yl)-2-hydroxy-5-cumylphenyl)methane, bis(3-(2H-benzotriazol-2-yl)-2-hydroxy-5-octylphenyl)methane, 1,1-bis(3-(2H-benzotriazol-2-yl)-2-hydroxy-5-methylphenyl)octane, 1,1-bis(3-(2H-5-chlorobenzotriazol-2-yl)-2-hydroxy-5-methylphenyl)octane, 1,2-ethanediylbis(3-(2H-benzotriazol-2 -yl)-2-hydroxybenzoate), 1,12-dodecanediylbis(3-(2H-benzotriazol-2-yl)-4-hydroxybenzoate), 1,3-cyclohexanediylbis(3-(5-chloro-2H-benzotriazol-2-yl)-2-hydroxybenzoate), 1,4-butanediylbis(3-(2H-benzotriazol-2-yl)-4-hydroxy-5-methylphenyl acetate), 3,6-dioxa-1,8-octanediylbis(3-(5-methoxy-2H-benzotriazol-2-yl)-4-hydroxyphenyl acetate), 1,6-hexanediyl bis(3-(3-(2H-benzotriazol-2-yl)-4-hydroxy-5-tert-butylphenyl) propionate), p-xylenediyl bis(3-(3-(2H-benzotriazol-2-yl)-4-hydroxyphenyl) propionate), bis(3-(2H-benzotriazol-2-yl)-4-hydroxytolyl) malonate, bis(2-(3-(2H-benzotriazol-2-yl)-4-hydroxy-5-octylphenyl)ethyl) terephthalate, bis(3-(2H-benzotriazol-2-yl)-4-hydroxy-5-propyltolyl) suberate, 2-(2 2-(2H-benzotriazole-2-yl)-6-phthalimidemethyl-4-methylphenol, 2-(2H-benzotriazole-2-yl)-6-phthalimideethyl-4-methylphenol, 2-(2H-benzotriazole-2-yl)-6-phthalimideoctyl-4-methylphenol, 2-(2H-benzotriazole-2-yl)-6-phthalimidemethyl-4-tert-butylphenol, 2-(2H-benzotriazole-2-yl)-6-phthalimidemethyl-4-cumylphenol, 2-(2H-benzotriazole-2-yl)-4,6-bis(phthalimidemethyl)phenol, etc. Among these, 2-(2-hydroxy-5-tert-octylphenyl)-2H-benzotriazole is preferred.

[0148] As the ultraviolet absorber, reference may be made to the description in paragraphs 0059 to 0062 of Japanese Patent Application Laid-Open No. 2016-216534 and the description in paragraphs 0069 to 0082 of Japanese Patent Application Laid-Open No. 2018-178019, the contents of which are incorporated into the present specification.

[0149] When the resin composition of the present embodiment contains a UV absorber, the content of the UV absorber is preferably 0.01 to 1 parts by mass relative to 100 parts by mass of the polycarbonate resin (A). The content of the UV absorber is more preferably 0.03 to 0.7 parts by mass, and further preferably 0.05 to 0.5 parts by mass relative to 100 parts by mass of the polycarbonate resin (A).

[0150] The resin composition of the present embodiment may contain only one type of ultraviolet absorber, or may contain two or more types. When containing two or more types, it is preferable that the total amount is within the above range.

[0151] <Stabilizer>

[0152] The resin composition of the present embodiment may contain a stabilizer.

[0153] Examples of the stabilizer include heat stabilizers and antioxidants.

[0154] As the heat stabilizer, a phosphorus-based stabilizer is preferably used.

[0155] As the phosphorus stabilizer, any known phosphorus stabilizer can be used. Specific examples include phosphorus oxygen acids such as phosphoric acid, phosphonic acid, phosphorous acid, phosphinic acid, and polyphosphoric acid; acidic pyrophosphate metal salts such as acidic sodium pyrophosphate, acidic potassium pyrophosphate, and acidic calcium 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 phosphite diester compounds, and organic phosphite compounds are particularly preferred.

[0156] As the antioxidant, a hindered phenol stabilizer is preferably used.

[0157] 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, diethylene sulfide bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N,N'-(hexane-1,6-diyl)bis[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"-( trimethylol-2,4,6-triyl) tri-p-cresol, 4,6-bis(octylthiomethyl)-o-cresol, ethylenebis(oxyethylene)bis[3-(5-tert-butyl-4-hydroxy-m-tolyl)propionate], hexamethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 1,3,5-tris(3,5-di-tert-butyl-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-triazine-2-ylamino)phenol, 2-[1-(2-hydroxy-3,5-di-tert-pentylphenyl)ethyl]-4,6-di-tert-pentylphenyl acrylate, etc.

[0158] Specific examples of such hindered phenol stabilizers include "Irganox (registered trademark, hereinafter the same) 1010" and "Irganox 1076" manufactured by BASF, and "ADKSTAB AO-50" and "ADKSTAB AO-60" manufactured by ADEKA.

[0159] The content of the stabilizer in the resin composition of the present embodiment is usually 0.001 mass parts or more, preferably 0.005 mass parts or more, more preferably 0.01 mass parts or more, relative to 100 mass parts of polycarbonate resin (A), and is usually 1 mass part or less, preferably 0.5 mass part or less, more preferably 0.3 mass part or less. By making the content of the stabilizer within the above range, the addition effect of the stabilizer can be more effectively exerted.

[0160] The resin composition of the present embodiment may contain only one stabilizer or two or more stabilizers. When containing two or more stabilizers, the total amount is preferably within the above range.

[0161] <Colorant>

[0162] The resin composition of the present embodiment may contain a colorant.

[0163] The colorant may be a pigment or a dye, preferably a dye.

[0164] In addition, the colorant may be a chromatic colorant or an achromatic colorant.

[0165] Examples of the inorganic pigments include sulfide pigments such as carbon black, cadmium red, and cadmium yellow; silicate pigments such as ultramarine; oxide pigments such as titanium oxide, zinc oxide, red iron oxide, chromium oxide, iron black, titanium yellow, zinc-iron brown, titanium cobalt green, cobalt green, cobalt blue, copper-chromium black, and copper-iron black; chromate pigments such as chrome yellow and molybdenum orange; ferrocyanide pigments such as Prussian blue, and the like.

[0166] Examples of organic pigments and / or organic dyes include phthalocyanine dyes such as copper phthalocyanine blue and copper phthalocyanine green; azo dyes such as nickel azo yellow; condensed polycyclic dyes such as methine dyes, pyrazolone dyes, thioindigo dyes, cyclic ketone dyes, perylene dyes, quinacridone dyes, dioxazine dyes, isoindolinone dyes, and quinolinephthalone dyes; anthraquinone dyes, heterocyclic dyes, and methyl dyes, and the like.

[0167] In this embodiment, the colorant preferably contains a black dye.

[0168] The content of the colorant in the resin composition of the present embodiment is usually 0.001 parts by mass or more, preferably 0.005 parts by mass or more, more preferably 0.01 parts by mass or more, and is usually 5 parts by mass or less, preferably 3 parts by mass or less, more preferably 1 part by mass or less, relative to 100 parts by mass of the polycarbonate resin (A). By making the content of the colorant within the above range, the effect of adding the colorant can be more effectively exerted.

[0169] The resin composition of the present embodiment may contain only one colorant, or may contain two or more colorants. When containing two or more colorants, the total amount is preferably within the above range.

[0170] <Release Agent>

[0171] The resin composition of the present embodiment may contain a release agent.

[0172] Examples of the release agent include aliphatic carboxylic acids, salts of aliphatic carboxylic acids, esters of aliphatic carboxylic acids and alcohols, aliphatic hydrocarbon compounds having a number average molecular weight of 200 to 15,000, polysiloxane silicone oils, ketone waxes, and light aminos. Aliphatic carboxylic acids, salts of aliphatic carboxylic acids, and esters of aliphatic carboxylic acids and alcohols are preferred.

[0173] For details of the release agent, reference can be made to paragraphs 0055 to 0061 of JP-A-2018-095706, and these contents are incorporated into this specification.

[0174] When the resin composition of the present embodiment contains a release agent, the content thereof is preferably 0.05% by mass to 3% by mass, more preferably 0.1% by mass to 0.8% by mass, and even more preferably 0.1% by mass to 0.6% by mass in the resin composition.

[0175] The resin composition of the present embodiment may contain only one type of release agent, or may contain two or more types. When containing two or more types, it is preferable that the total amount is within the above range.

[0176] <Other ingredients>

[0177] In the resin composition of the present embodiment, in addition to (A) polycarbonate resin and (B) elastomer, and the above-mentioned additives, other components other than the above-mentioned may be contained as required, as long as the desired various physical properties are not significantly impaired. If examples of other components are given, other thermoplastic resins, various resin additives, etc. may be given.

[0178] As resin additives, for example, antistatic agents, flame retardants, flame retardant aids, antifogging agents, lubricants, anti-blocking agents, flow improvers, plasticizers, dispersants, antibacterial agents, etc. can be cited. It should be noted that the resin additive can contain one kind, or two or more kinds in any combination and ratio. For their details, reference can be made to the records of paragraphs 0059 to 0080 of Japanese Patent Publication No. 2014-065901 and the records of paragraphs 0069 to 0093 of Japanese Patent Publication No. 2018-165017, and the contents are incorporated into this specification.

[0179] The resin composition of the present embodiment is adjusted so that the total of the (A) polycarbonate resin, the (B) elastomer, and the resin additives (for example, a colorant, a stabilizer, and an ultraviolet absorber) blended as necessary is 100% by mass.

[0180] <Physical Properties of Resin Composition>

[0181] The resin composition of the present embodiment preferably has a small haze.

[0182] Specifically, the resin composition of the present embodiment has a haze of preferably 70% or less, more preferably 50% or less, further preferably 48% or less, further preferably 35% or less, further preferably 30% or less, further preferably 20% or less when molded into a 2 mm thick flat test piece. The lower limit of the haze is actually more than 0%, and even if it is 1% or more, the required performance is fully satisfied.

[0183] The haze is measured according to the description in the examples described below.

[0184] The resin composition of the present embodiment also preferably has high hardness.

[0185] Specifically, the pencil hardness of the resin composition of the present embodiment when molded into a 2 mm thick flat test piece is preferably HB or higher. The upper limit is not particularly limited, and even if it is 4H or lower, the required performance is sufficiently satisfied.

[0186] The pencil hardness is measured according to the description in the examples described later.

[0187] The resin composition of the present embodiment also preferably has excellent impact resistance.

[0188] Specifically, the notched Charpy impact strength when the resin composition of the present embodiment is molded into an ISO tensile test piece (4 mm thick) is preferably 4 kJ / m 2 More preferably, 5 kJ / m 2 More preferably, 9 kJ / m 2 More preferably, 10 kJ / m 2 In addition, the upper limit of the above Charpy impact strength is, for example, 50 kJ / m 2 the following.

[0189] <Method for producing resin composition>

[0190] The method for producing the resin composition of the present embodiment is not limited, and a known method for producing a polycarbonate resin composition can be widely adopted, and the following method can be cited: (A) polycarbonate resin, (B) elastomer, and other components mixed as needed are pre-mixed using various mixers such as a tumble mixer and 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, and a kneader.

[0191] The temperature of melt kneading is not particularly limited, but is usually in the range of 240°C to 320°C.

[0192] <Molding>

[0193] One aspect of the resin composition of the present embodiment is a pellet.

[0194] The above-mentioned resin composition (for example, pellets) is molded into a molded article by various molding methods. That is, the molded article of the present embodiment is molded from the resin composition or pellets of the present embodiment.

[0195] The shape of the molded product is not particularly limited and can be appropriately selected according to the use and purpose of the molded product, and examples thereof include film, rod, cylinder, ring, circle, ellipse, polygon, irregular shape, hollow, frame, box, panel, etc. Among them, the panel shape is preferred, and the thickness is, for example, about 1 mm to 5 mm.

[0196] There is no particular restriction on the method for molding the molded product, and the existing known molding method can be adopted, such as injection molding, injection extrusion molding, extrusion molding, profile extrusion, transfer molding, hollow molding, gas-assisted hollow molding, blow molding, extrusion blow molding, IMC (in-mold coating molding) molding, rotational molding, multilayer molding, two-color molding, insert molding, sandwich molding, foam molding, compression molding, etc. The resin composition of the present embodiment is particularly suitable for the molded product obtained by injection molding, injection extrusion molding, and extrusion molding. However, the resin composition of the present embodiment is certainly not limited to the molded product obtained by these methods.

[0197] The molded product of this embodiment is suitable for electrical and electronic equipment, OA equipment, portable information terminals, mechanical parts, home appliances, vehicle parts, various containers, lighting equipment and other parts, etc. Among them, it is particularly suitable for display parts, portable information terminal parts, household electrical products or indoor daily appliances.

[0198] Example

[0199] The present invention is described in more detail below by enumerating examples. As long as it does not depart from the gist of the present invention, the materials, dosage, ratio, processing content, processing procedures, etc. shown in the following examples can be appropriately changed. Therefore, the scope of the present invention is not limited to the specific examples shown below.

[0200] When the measuring equipment used in the examples is difficult to obtain due to discontinuation of production or the like, other equipment having equivalent performance may be used for measurement.

[0201] 1. Raw materials

[0202] The following ingredients were used.

[0203] [Table 1]

[0204]

[0205] [Table 2]

[0206]

[0207] <Production Example 1: Production of Polycarbonate Resin A1>

[0208] 26.14 mol (6.75 kg) of bisphenol C (BPC) and 26.79 mol (5.74 kg) of diphenyl carbonate were placed in an aluminum (SUS) reactor (internal volume 10 liters) equipped with a stirrer and a distillation condenser. After the interior of the reactor was replaced with nitrogen, the temperature was raised to 220° C. in a nitrogen atmosphere over 30 minutes.

[0209] Next, the reaction solution in the reactor was stirred, and the concentration of BPC in the molten reaction solution was 1.5×10 -6 Cesium carbonate (Cs2CO3) was added as a catalyst for the transesterification reaction in a molar manner, and the reaction solution was stirred and brewed at 220°C for 30 minutes under a nitrogen atmosphere. Then, the pressure in the reactor was reduced to 100 Torr over 40 minutes at the same temperature, and the reaction was further reacted for 100 minutes to distill off phenol.

[0210] Next, the temperature in the reactor was raised to 284°C over 60 minutes, and the pressure was reduced to 3 Torr, so that the phenol equivalent to the theoretical amount of distillation was distilled out. Next, the pressure in the reactor was kept at less than 1 Torr at this temperature, and the reaction was continued for another 60 minutes to terminate the polycondensation reaction. At this time, the stirring speed of the stirrer was 38 rpm, the temperature of the reaction solution just before the end of the reaction was 289°C, and the stirring power was 1.00 kW.

[0211] Next, the reaction solution in a molten state was fed into a twin-screw extruder, and butyl p-toluenesulfonate in a molar amount of 4 times that of cesium carbonate was fed from the first supply port of the twin-screw extruder and mixed with the reaction solution. Thereafter, the reaction solution was extruded in the form of strands through the die of the twin-screw extruder and cut with a cutter to obtain pellets of polycarbonate resin A1.

[0212] <Production Example 2: Production of Polycarbonate Resin A2>

[0213] 26.14 mol (6.75 kg) of bisphenol C (BPC) and 26.79 mol (5.74 kg) of diphenyl carbonate were placed in an aluminum (SUS) reactor (internal volume 10 liters) equipped with a stirrer and a distillation condenser. After the interior of the reactor was replaced with nitrogen, the temperature was raised to 220° C. in a nitrogen atmosphere over 30 minutes.

[0214] Next, the reaction solution in the reactor was stirred, and the concentration of BPC in the molten reaction solution was 1.5×10 -6 Cesium carbonate (Cs2CO3) was added as a catalyst for the transesterification reaction in a molar manner, and the reaction solution was stirred and brewed at 220°C for 30 minutes under a nitrogen atmosphere. Then, the pressure in the reactor was reduced to 100 Torr over 40 minutes at the same temperature, and the reaction was further reacted for 100 minutes to distill off phenol.

[0215] Next, the temperature in the reactor was raised to 284°C over 60 minutes, and the pressure was reduced to 3 Torr, so that the phenol equivalent to the theoretical amount of distillation was distilled out. Next, the pressure in the reactor was kept at less than 1 Torr at this temperature, and the reaction was continued for another 60 minutes to terminate the polycondensation reaction. At this time, the stirring speed of the stirrer was 38 rpm, the temperature of the reaction solution just before the end of the reaction was 289°C, and the stirring power was 0.60 kW.

[0216] Next, the reaction solution in a molten state is fed into a twin-screw extruder, and butyl p-toluenesulfonate in a molar amount of 4 times that of cesium carbonate is fed from the first supply port of the twin-screw extruder and mixed with the reaction solution. Thereafter, the reaction solution is extruded in the form of strands through the die of the twin-screw extruder and cut with a cutter to obtain pellets of polycarbonate resin A2.

[0217] <Measurement of Pencil Hardness of Polycarbonate Resin and Resin Composition>

[0218] The pencil hardness of the polycarbonate resin and the resin composition was determined by molding a flat test piece having a thickness of 2 mm and measuring the pencil hardness at a load of 750 g using a pencil hardness tester in accordance with ISO 15184.

[0219] Specifically, after the polycarbonate resin pellets were dried at 100° C. for 5 hours, a flat test piece (150 mm×100 mm×2 mm thick) was prepared using an injection molding machine (FANUC Corporation "α-2000i-150B") under the conditions of a barrel setting temperature of 260° C., a mold temperature of 70° C., a screw speed of 100 rpm, and an injection speed of 30 mm / sec. The flat test piece was subjected to a pencil hardness tester (Toyo Seiki Co., Ltd.) in accordance with ISO 15184, and the pencil hardness was measured at a load of 750 g.

[0220] <(B) Measurement of Styrene Content in Elastomer (Styrene-Based Elastomer)>

[0221] The mass ratio (%) of (B) in the total amount of the elastomer was calculated from the masses of carbon, hydrogen and oxygen measured using a fully automatic elemental analyzer.

[0222] The fully automatic elemental analysis device used was a vario EL cube manufactured by Elementar.

[0223] 2. Examples 1-1 to 1-12, Comparative Examples 1-1 to 1-7

[0224] <Manufacturing of Resin Composition Pellets>

[0225] The components described in Table 1 or 2 were mixed in the proportions shown in Tables 3 to 5 (expressed in parts by mass unless otherwise specified), uniformly mixed using a tumble mixer, and then supplied to a twin-screw extruder (TEM26SX manufactured by Shibaura Machine Co., Ltd.) through one vent from an upstream feeder. A glass filler was then supplied from the middle of the barrel (a downstream position of 3 / 5 of the barrel length L from the upstream (hopper portion) of the extruder), and supplied from the barrel of the upstream portion of the extruder to the extruder at a barrel setting temperature of 260° C., a screw speed of 180 rpm, and a discharge rate of 25 kg / hr, and melt-kneaded to obtain resin composition pellets.

[0226] <Haze>

[0227] The haze was measured at 23° C. using a flat test piece molded into a thickness of 2 mm in accordance with JIS K-7105.

[0228] Specifically, the resin composition pellets obtained above were dried at 100°C for 5 hours, and then injection molded into flat test pieces (90 mm × 50 mm × 2 mm thick) using an injection molding machine ("J55-60H" manufactured by Nippon Steel Works, Ltd.) under the conditions of a barrel setting temperature of 280°C, a mold temperature of 80°C, a screw speed of 100 rpm, and an injection speed of 100 mm / s.

[0229] About the flat plate test piece obtained above, HAZE (haze) at 23° C. was measured using a haze meter in accordance with JIS K-7105.

[0230] As the haze meter, a model NDH-2000 manufactured by Nippon Denshoku Industries Co., Ltd. was used.

[0231] The unit of haze is %.

[0232] <Charpy impact strength>

[0233] Charpy impact strength The unnotched Charpy impact strength and the notched Charpy impact strength were measured in accordance with ISO 179 on a test piece molded into an ISO test piece having a thickness of 3 mm.

[0234] Specifically, the pellets obtained above were dried at 100° C. for 5 hours, and then injection molded into 3 mm thick ISO test pieces using an injection molding machine (“J85AD” manufactured by The Japan Steel Works, Ltd.) at a cylinder temperature of 280° C. and a mold temperature of 80° C. Unnotched Charpy impact strength and notched Charpy impact strength were measured in accordance with ISO179.

[0235] <Overall Evaluation>

[0236] Based on the above evaluations of haze, pencil hardness, and notched Charpy impact strength, the score of each Example and Comparative Example was calculated and evaluated as follows.

[0237] <<Evaluation Category>>

[0238] A: 4 points in total

[0239] B: Total 3 points and no 0 points in the evaluation

[0240] C: 2 points in total and no 0 points in the evaluation

[0241] D: Total score is 1 and / or there is 1 evaluation score of 0

[0242] <<Haze>>

[0243] 1 point: Haze is less than 50%

[0244] 0 points: Haze exceeds 50%

[0245] <<Pencil Hardness>>

[0246] 1 point: Pencil hardness is HB or harder

[0247] 0 points: Pencil hardness is B or softer

[0248] <<Impact resistance>>

[0249] 2 points: Notched Charpy impact strength is 10 kJ / m2 above

[0250] 1 point: Notched Charpy impact strength is 5 kJ / m 2 Above and less than 10kJ / m 2

[0251] 0 points: Notched Charpy impact strength is less than 5 kJ / m 2

[0252] [Table 3]

[0253]

[0254] [Table 4]

[0255]

[0256] [Table 5]

[0257]

[0258] The resin composition of the present embodiment can provide a molded product having excellent impact resistance, excellent hardness, and excellent transparency (Examples 1-1 to 1-12). In contrast, in the case of not containing an elastomer (Comparative Example 1-1, Comparative Example 1-2), the impact resistance is poor. In addition, even if an elastomer is included, the haze becomes high when the styrene content is low (Comparative Examples 1-3 to 1-7).

[0259] 3. Examples 2-1 to 2-12, Comparative Examples 2-1 to 2-7

[0260] <Manufacturing of Resin Composition Pellets>

[0261] The components described in Table 1 or 2 were mixed in the proportions shown in Tables 6 to 8 (expressed in parts by mass unless otherwise specified), uniformly mixed using a tumble mixer, and then supplied to a twin-screw extruder (TEM26SX manufactured by Shibaura Machine Co., Ltd.) through one exhaust port from an upstream feeder. A glass filler was then supplied from the middle of the barrel (a downstream position of 3 / 5 of the barrel length L from the upstream (hopper portion) of the extruder), and supplied from the barrel of the upstream portion of the extruder to the extruder at a barrel setting temperature of 260° C., a screw speed of 180 rpm, and a discharge rate of 25 kg / hr, and melt kneading was performed to obtain resin composition pellets.

[0262] <Blackness (L* value)>

[0263] The L* value is measured at 23° C. using a flat test piece formed into a thickness of 2 mm as described above and a D65 / 10° light source. A smaller L* value means higher blackness (jet blackness).

[0264] [Table 6]

[0265]

[0266] [Table 7]

[0267]

[0268] [Table 8]

[0269]

[0270] The pencil hardness and Charpy impact strength of Examples 2-1 to 2-12 and Comparative Examples 2-1 to 2-7 were substantially the same as those of Examples 1-1 to 1-12 and Comparative Examples 1-1 to 1-7, respectively.

Claims

1. A resin composition, wherein In 100% by mass of the resin composition, the following is contained: (A) 80% to 99% by mass of a polycarbonate resin; and (B) 1 to 20% by mass of an elastomer containing styrene units in a ratio of 50% by mass or more of all structural units, The polycarbonate resin (A) contains a structural unit represented by formula (1) in a ratio of 8 mol % or more of all structural units, Formula (1) [Chemistry 1] In formula (1), R 1 Represents methyl, R 2 represents a hydrogen atom or a methyl group, X 1 represents any of the following, [Chemistry 2] R 3 and R 4 Each independently represents a hydrogen atom or a methyl group, and Z represents a group which bonds to C to form an alicyclic hydrocarbon which may have a substituent and has 6 to 12 carbon atoms.

2. The resin composition according to claim 1, wherein The (A) polycarbonate resin contains the unit represented by formula (1) in a ratio of less than 50 mol % of all structural units.

3. The resin composition according to claim 1 or 2, wherein R in the structural unit represented by formula (1) 2 is a hydrogen atom, X 1 By -C(R 3 )(R 4 )-express. The resin composition according to claim 1 or 2, further comprising a colorant.

5. The resin composition according to claim 1 or 2, wherein The content of the colorant is 0.001 to 5 parts by mass based on 100 parts by mass of the polycarbonate resin (A).

6. The resin composition according to claim 1 or 2, wherein The (B) elastomer comprises high impact polystyrene.

7. The resin composition according to claim 1 or 2, wherein The (B) elastomer includes high-impact polystyrene, and the high-impact polystyrene includes styrene units in a ratio of 85 mass % or more of all structural units.

8. The resin composition according to claim 1, wherein The polycarbonate resin (A) contains the unit represented by formula (1) in a ratio of less than 50 mol% of all structural units, R in the structural unit represented by formula (1) 2 is a hydrogen atom, X 1 By -C(R 3 R 4 )-express, The resin composition further comprises a colorant, The content of the colorant is 0.001 to 5 parts by mass based on 100 parts by mass of the polycarbonate resin (A). The (B) elastomer comprises high impact polystyrene.

9. The resin composition according to claim 1, wherein The polycarbonate resin (A) contains the unit represented by formula (1) in a ratio of less than 50 mol% of all structural units, R in the structural unit represented by formula (1) 2 is a hydrogen atom, X 1 By -C(R 3 R 4 )-express, The resin composition further comprises a colorant, The content of the colorant is 0.001 to 5 parts by mass based on 100 parts by mass of the polycarbonate resin (A). The (B) elastomer includes high-impact polystyrene, and the high-impact polystyrene includes styrene units in a ratio of 85 mass % or more of all structural units. 10 . Pellets, which are pellets of the resin composition according to claim 1 .

11. A molded article molded from the resin composition according to any one of claims 1, 2, 8 and 9.

12. A molded product formed by molding the pellets according to claim 10.

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