Masterbatch, resin composition, and resin molded article

Abstract

To provide a masterbatch that, when diluted with polycarbonate (PC) resin, yields a resin composition with good processability and moldability, low yellowness, and good transparency when the PC resin is transparent. [Solution] A masterbatch for PC resin (C) contains PC resin (A) having a terminal hydroxyl group concentration of 400 ppm by mass or less, and a chain extender (B) having a weight-average epoxy functional group count of 3 to 65 and a weight-average molecular weight of 2000 to 30000. The content of the chain extender (B) in this masterbatch is 0.10% by mass or more and 25% by mass or less. Furthermore, this masterbatch is used by mixing it with PC resin (C) under conditions that the content of the chain extender (B) in the resin composition containing the masterbatch and PC resin (C) is 0.05% by mass or more and 2.5% by mass or less.

Description

[Technical Field]

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

[0002] Polycarbonate resin is currently used in a variety of fields, including optical discs such as CDs and DVDs, automotive parts, building materials, and medical devices. For example, in recent years, the use of polycarbonate resin has spread remarkably, mainly in optical discs, and its volume of use has become enormous. In Japan, colorless and transparent optical discs are used to promote recycling. In recent years, there has been a growing social demand to recycle resources by reusing waste products that are produced and consumed in large quantities, rather than simply discarding them after consumption. Under these circumstances, recycling of polycarbonate resin is also progressing.

[0003] There are various methods for recycling polycarbonate resin. Material recycling includes horizontal recycling and cascade recycling. Horizontal recycling is a method in which used polycarbonate resin products are collected, crushed and washed to produce recycled polycarbonate resin pellets, which are then used as raw materials to manufacture products of equivalent quality (e.g., optical discs and automobile parts). Cascade recycling, on the other hand, is a recycling method in which recycled polycarbonate resin pellets are applied to products with lower performance requirements than the original product, such as building materials and general merchandise. In either case, as the polycarbonate resin becomes smaller in molecular weight due to thermal history and other factors with each recycling cycle, its moldability and strength deteriorate, so there is a limit to the number of times it can be recycled.

[0004] One example of a method to improve properties such as moldability and heat resistance of polycarbonate resin is to blend various additives with the polycarbonate resin and melt-knead it. For example, Patent Document 1 discloses an aromatic polycarbonate resin composition obtained by mixing an aromatic polycarbonate resin, an epoxy group-containing compound, and a glycerin monofatty acid ester in predetermined proportions and melt-kneading them. This aromatic polycarbonate resin composition is disclosed to have excellent moisture heat resistance and moldability heat resistance. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] International Publication No. 2023 / 176396 [Overview of the project] [Problems that the invention aims to solve]

[0006] In the technology disclosed in Patent Document 1, the evaluation of the heat resistance to moisture and heat and the heat resistance to molding of molded sheets of aromatic polycarbonate resin compositions uses the haze (ΔHaze) of the molded sheet before and after moist heat treatment and the color difference ΔE of the molded sheet before and after retention in the molding die as indicators, respectively. In other words, the technology disclosed in Patent Document 1 aims to minimize changes before and after moist heat treatment and before and after retention in the molding die, and does not require excellent transparency or low yellowness in the aromatic polycarbonate resin composition or the molded product itself.

[0007] On the other hand, as mentioned above, there is a need for a technology that can obtain a resin composition with excellent transparency and low yellowness by mixing it with the polycarbonate resin to be modified or chain-extended, such as in the form of a modifier or a masterbatch for chain extension.

[0008] Therefore, the present invention aims to provide a masterbatch for polycarbonate (PC) resin that, when diluted with PC resin, exhibits good processability and moldability, and that, when the PC resin is transparent, has good transparency and low yellowness, and when the PC resin is not transparent, can yield a resin composition with low yellowness. [Means for solving the problem]

[0009] In other words, the present invention provides a masterbatch for polycarbonate resin (C) that contains a polycarbonate resin (A) having a terminal hydroxyl group concentration of 400 ppm by mass or less, and a chain extender (B) having a weight-average epoxy functional group count of 3 or more and a weight-average molecular weight of 2000 or more and 30000 or less, and that satisfies the following conditions (1) and (2). Condition (1): The content of the chain extender (B) in the masterbatch is 0.10% by mass or more and 25% by mass or less, based on the total mass of the masterbatch. Condition (2): The masterbatch is used by mixing it with the polycarbonate resin (C) under the condition that the content of the chain extender (B) in the resin composition containing the masterbatch and the polycarbonate resin (C) in which the masterbatch is used is 0.05% by mass or more and 2.5% by mass or less. [Effects of the Invention]

[0010] According to the present invention, a masterbatch for polycarbonate (PC) resin can be provided that, when diluted with PC resin, exhibits good processability and moldability, and if the PC resin is transparent, it has good transparency and low yellowness, and if the PC resin is not transparent, it can produce a resin composition with low yellowness. [Modes for carrying out the invention]

[0011] The following describes embodiments of the present invention, but the present invention is not limited to the following embodiments.

[0012] <Masterbatch> A masterbatch of one embodiment of the present invention (hereinafter sometimes simply referred to as "masterbatch") is a masterbatch for polycarbonate resin (hereinafter referred to as "polycarbonate resin (C)" in this disclosure). In this disclosure, since the polycarbonate resin (C) to which the masterbatch is used is used to dilute the masterbatch, polycarbonate resin (C) may be referred to as "diluting polycarbonate resin (C)". Also, "polycarbonate" may be abbreviated as "PC". Furthermore, since the masterbatch contains polycarbonate resin (A), it is a type of resin composition. For convenience, in this disclosure, a composition obtained by mixing a material containing the masterbatch and diluting polycarbonate resin (C) by melt kneading or the like, and a composition compared thereto, will be referred to as "resin composition". Furthermore, in this disclosure, a molded article obtained by molding a resin composition by a method such as injection molding will be referred to as a "resin molded article".

[0013] The masterbatch contains a polycarbonate resin (A) and a chain extender (B). The polycarbonate resin (A) has a terminal hydroxyl group concentration of 400 ppm by mass or less. The chain extender (B) has a weight-average epoxy functional group count of 3 to 65 and a weight-average molecular weight of 2000 to 30000. The masterbatch satisfies the following conditions (1) and (2).

[0014] Condition (1): The content of chain extender (B) in the masterbatch is 0.10% by mass or more and 25% by mass or less, based on the total mass of the masterbatch.

[0015] Condition (2): The masterbatch is used by mixing it with the polycarbonate resin (C) under the condition that the content of the chain extender (B) in the resin composition containing the masterbatch and the polycarbonate resin (C) in which the masterbatch is used is 0.05% by mass or more and 2.5% by mass or less.

[0016] By using a masterbatch containing the above-mentioned specific polycarbonate resin (A) and the above-mentioned specific chain extender (B), and satisfying both conditions (1) and (2), it is possible to obtain the desired resin composition. That is, when the masterbatch is diluted with a diluent polycarbonate (PC) resin (C), it is possible to obtain a resin composition with good processability and moldability. At the same time, if the diluent PC resin (C) is transparent, it is possible to obtain a resin composition that is less prone to clouding, has good transparency and low yellowness, and if the diluent PC resin (C) is not transparent, it is possible to obtain a resin composition with low yellowness.

[0017] The following provides a detailed explanation of each component of the masterbatch, as well as conditions (1) and (2), etc.

[0018] (Polycarbonate resin (A)) The masterbatch contains polycarbonate resin (A) (hereinafter sometimes simply referred to as "PC resin (A)") having a terminal hydroxyl group concentration of 400 ppm by mass or less. PC resin (A) may be used alone, or two or more types may be used in combination in any ratio.

[0019] PC resin (A) is the base resin in the masterbatch. By using PC resin (A), which has a terminal hydroxyl group concentration of 400 ppm by mass or less, as the base resin in the masterbatch, reactions during masterbatch preparation can be suppressed, and the apparent molecular weight of PC resin (C) can be increased when the masterbatch is diluted with PC resin (C). This contributes to providing a resin composition that has good processability and moldability, low yellowness, and, when using a transparent diluent PC resin (C), also has good transparency.

[0020] The PC resin (A) has a terminal hydroxyl group concentration, i.e., a terminal hydroxyl group concentration of 400 ppm by mass or less, preferably 300 ppm by mass or less, more preferably 250 ppm by mass or less, and even more preferably 200 ppm by mass or less. If the terminal hydroxyl group concentration of PC resin (A) exceeds 400 ppm by mass, the PC resin (A) and the chain extender (B) will react during masterbatch preparation, causing gelation. The terminal hydroxyl group concentration (ppm by mass) of PC resin (A) is expressed in ppm as the mass of hydroxyl groups present at the ends of PC resin (A) relative to the mass of PC resin (A), and the measurement method is colorimetric determination by the titanium tetrachloride / acetic acid method. When determining the terminal hydroxyl group concentration by colorimetric determination, molecular weight data of PC resin (A) is required, and in this disclosure, viscosity-average molecular weight can be used. The lower limit of the terminal hydroxyl group concentration of PC resin (A) is not particularly limited and may be 10 ppm by mass or more.

[0021] The PC resin (A) having a terminal hydroxyl group concentration of 400 ppm by mass or less is preferably one synthesized by interfacial polycondensation (i.e., an interfacial polycondensate PC resin (A)). Commercially available PC resins (A) can also be used. Examples of commercially available PC resins (A) include the "Panlight" series from Teijin Corporation, the "SD Polycarbonate" series from Sumika Polycarbonate Corporation, the "Upilon" series from Mitsubishi Engineering Plastics Corporation, and the "Toughlon" series from Idemitsu Kosan Corporation.

[0022] The content of polycarbonate resin (A) in the masterbatch is preferably 75% to 99.9% by mass, more preferably 80% to 97% by mass, and even more preferably 82% to 95% by mass, based on the total mass of the masterbatch. When the content of PC resin (A) in the masterbatch is within the above range, when the masterbatch is diluted with diluent PC resin (C), a resin composition with good processability and moldability is obtained, as well as low yellowness, and when a transparent diluent PC resin (C) is used, a resin composition with good transparency is easily obtained.

[0023] (Chain elongator (B)) The masterbatch contains a chain extender (B). This chain extender (B) has a weight-average epoxy functional group count of 3 to 65 and a weight-average molecular weight of 2000 to 30000. Since the weight-average epoxy functional group count of chain extender (B) is 3 to 65, it has glycidyl groups (epoxy groups). The glycidyl groups of chain extender (B) can react with at least one of the hydroxyl groups and / or carboxyl groups (hereinafter sometimes referred to as "hydroxyl groups and / or carboxyl groups") present in the diluent polycarbonate resin (C). Therefore, when the masterbatch is diluted with the diluent PC resin (C), the chain extender (B) reacts with the diluent PC resin (C) to extend the chains of the diluent PC resin (C) and increase its molecular weight, thereby suppressing yellowing and clouding while also suppressing deformation during molding.

[0024] The weight-average number of epoxy functional groups and the weight-average molecular weight of the chain extender (B) must both be within the specified ranges described above. Preferably, the weight-average number of epoxy functional groups of the chain extender (B) is 3 or more and 65 or less, and the weight-average molecular weight of the chain extender (B) is 4000 or more and 20000 or less, and more preferably 7000 or more and 12000 or less.

[0025] If the weight-average number of epoxy functional groups of the chain extender (B) is 3 or more and 65 or greater than 65, and the weight-average molecular weight is less than 2000, excessive crosslinking reactions are likely to occur between the chain extender (B) in the masterbatch and the diluent polycarbonate resin (C). As a result, the resin composition obtained by diluting the masterbatch with the diluent PC resin (C) tends to whiten, and if a transparent diluent PC resin (C) is used, the transparency tends to be poor. Furthermore, the viscosity may increase during melt-kneading of the masterbatch and the diluent PC resin (C), resulting in insufficient dispersion of the chain extender (B) in the diluent PC resin (C). On the other hand, if the weight-average number of epoxy functional groups of the chain extender (B) is 3 or more and 65 or less or less than 3, and the weight-average molecular weight is greater than 30000, the above crosslinking reactions are less likely to occur sufficiently, and the resulting resin composition may have poor moldability. Furthermore, if the weight-average number of epoxy functional groups of the chain extender (B) is less than 3 and the weight-average molecular weight is less than 2000, the above crosslinking reaction will be insufficient, and the resulting resin composition may have poor processability and moldability. On the other hand, if the weight-average number of epoxy functional groups of the chain extender (B) is greater than 65 and the weight-average molecular weight is greater than 30000, the above crosslinking reaction is even more likely to occur in excess. As a result, the resin composition obtained by diluting the masterbatch with diluent PC resin (C) is prone to whitening, and when a transparent diluent PC resin (C) is used, the transparency tends to be poor.

[0026] In this disclosure, the weight-average molecular weight of the chain extender (B) refers to the polystyrene-converted value measured by gel permeation chromatography (GPC). Specifically, the weight-average molecular weight of the chain extender (B) can be obtained by measuring it using the following apparatus and conditions. • GPC device: Product name "HLC-8020" (manufactured by Tosoh Corporation) • Columns: Product names "TSKgel G2000HXL", "G3000HXL", "G4000GXL" (manufactured by Tosoh Corporation) • Solvent: Tetrahydrofuran (THF) ·Flow rate: 1.0mL / min • Sample concentration: 2g / L ·Injection volume: 100μL ·Temperature: 40℃ • Detector: Model number "RI-8020" (manufactured by Tosoh Corporation) • Standard material: TSK standard polystyrene (manufactured by Tosoh Corporation)

[0027] As described above, the chain extender (B) has glycidyl groups (epoxy groups), which are functional groups that can react with the hydroxyl groups and / or carboxyl groups of the diluent polycarbonate resin (C). The average number of glycidyl groups (epoxy groups) per molecule of the chain extender (B) is expressed as the weight-average number of epoxy functional groups, which can be set appropriately according to the desired reaction strength. The weight-average number of epoxy functional groups can be determined by dividing the weight-average molecular weight of the chain extender (B) by the epoxy equivalent. For example, by determining the desired weight-average molecular weight, the ratio of polymerizable monomers having glycidyl groups (epoxy groups) to other polymerizable monomers can be adjusted and polymerized. This makes it possible to produce a chain extender (B) having the desired average number of glycidyl groups (epoxy groups) per molecule.

[0028] As an example, we will explain the case of producing a chain extender (B) using glycidyl methacrylate as a polymerizable monomer having glycidyl groups and styrene as another polymerizable monomer. Specifically, when producing a chain extender (B) with a weight-average molecular weight of 5000 and an average of 4 glycidyl groups (epoxy groups) per molecule using styrene and glycidyl methacrylate, the process is as follows: By charging styrene (molecular weight 104.15) and glycidyl methacrylate (molecular weight 142.15) in a mass ratio of styrene:glycidyl methacrylate = 10.6:1, a styrene / glycidyl methacrylate copolymer can be obtained as the desired chain extender (B).

[0029] The weight-average number of epoxy functional groups in the chain extender (B) is 3 to 65, preferably 4 to 50. Due to the effect of the chain extender (B), when the material containing the masterbatch and the diluent polycarbonate resin (C) is melt-kneaded, the hydroxyl groups and / or carboxyl groups of the diluent PC resin (C) react with the chain extender (B), and a portion of them is crosslinked. This improves the strength during melt-kneading and makes it easier to obtain a resin composition with good moldability.

[0030] If the weight-average molecular weight of the chain extender (B) is between 2,000 and 30,000 or greater than 30,000, and the weight-average number of epoxy functional groups is less than 3, the number of crosslinking points between the chain extender (B) and the diluent polycarbonate resin (C) in the masterbatch will be small. As a result, the strength improvement during melt mixing of the masterbatch and the diluent PC resin (C) may be insufficient, and the moldability of the resulting resin composition may be reduced. On the other hand, if the weight-average molecular weight of the chain extender (B) is between 2,000 and 30,000 or less than 2,000, and the weight-average number of epoxy functional groups is greater than 65, the number of crosslinking points will be too large, and the reaction between the chain extender (B) and the diluent PC resin (C) will proceed too much. As a result, the resulting resin composition may be prone to whitening, and if a transparent diluent PC resin (C) is used, the transparency may be poor. Also, the reaction with the diluent PC resin (C) may be too excessive, resulting in a resin composition with poor moldability. Furthermore, if the weight-average molecular weight of the chain extender (B) is less than 2000 and the weight-average number of epoxy functional groups is less than 3, the above crosslinking reaction will be insufficient, and the resulting resin composition may have poor processability and moldability. On the other hand, if the weight-average molecular weight of the chain extender (B) is greater than 30000 and the weight-average number of epoxy functional groups is greater than 65, the above crosslinking reaction is even more likely to occur excessively. As a result, the resin composition obtained by diluting the masterbatch with diluent PC resin (C) is prone to whitening, and when a transparent diluent PC resin (C) is used, the transparency tends to be poor.

[0031] The epoxy equivalent of the chain extender (B) is preferably 100 g / mol or more and 1000 g / mol or less, more preferably 150 g / mol or more and 800 g / mol or less, and even more preferably 200 g / mol or more and 600 g / mol or less. When the epoxy equivalent of the chain extender (B) is 100 g / mol or more, the number of crosslinking points increases appropriately, which tends to improve the strength during melt mixing of the masterbatch and the diluent polycarbonate resin (C), and the resulting resin composition tends to have good moldability. On the other hand, when the epoxy equivalent of the chain extender (B) is 1000 g / mol or less, the number of crosslinking points is kept to an appropriate level, and the transparency of the resulting resin composition tends to be good when a transparent diluent PC resin (C) is used. In this disclosure, the epoxy equivalent of the chain extender (B) can be a value measured in accordance with the provisions of JIS K7236.

[0032] The chain extender (B) may have glycidyl groups (epoxy groups) in the main chain, side chains, or terminals of the molecular chain, or in multiple of these locations. The type of chain extender (B) is not particularly limited, as long as both the weight-average number of epoxy functional groups and the weight-average molecular weight are within the specific ranges described above. As mentioned above, suitable chain extenders (B) include copolymers of polymerizable monomers having glycidyl groups (epoxy groups) and monomer mixtures containing other polymerizable monomers. The copolymer may be a random copolymer, a block copolymer, a graft copolymer, or an alternating copolymer.

[0033] Preferred examples of polymerizable monomers having a glycidyl group include (meth)acrylate monomers having a glycidyl group (hereinafter sometimes referred to as "glycidyl (meth)acrylate monomers"). Examples of glycidyl (meth)acrylate monomers include glycidyl acrylate, glycidyl methacrylate, 4-hydroxybutyl acrylate glycidyl ether, and allyl glycidyl ether. One or more of these can be used. Among these, glycidyl acrylate and glycidyl methacrylate are preferred. In this disclosure, the term "(meth)acrylate" means that both "acrylate" and "methacrylate" are included.

[0034] Other suitable examples of polymerizable monomers include styrene monomers, (meth)acrylate monomers, and olefin monomers. Examples of styrene monomers include styrene, α-methylstyrene, o-methylstyrene, p-methylstyrene, vinylxylene, ethylstyrene, dimethylstyrene, and p-tert-butylstyrene. One or more styrene monomers can be used. Examples of (meth)acrylate monomers include methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, and ethylhexyl (meth)acrylate. One or more (meth)acrylate monomers can be used. Examples of olefin monomers include ethylene, propylene, butadiene, and isoprene. One or more olefin monomers can be used.

[0035] Preferred types of chain extender (B) include copolymers of styrene monomers and glycidyl (meth)acrylate monomers (styrene / glycidyl (meth)acrylate copolymer), copolymers of styrene monomers, (meth)acrylate monomers and glycidyl (meth)acrylate monomers (styrene / (meth)acrylate / glycidyl (meth)acrylate copolymer), and copolymers of styrene monomers, olefin monomers and glycidyl (meth)acrylate monomers (styrene / olefin / glycidyl (meth)acrylate copolymer).

[0036] Commercially available chain extenders (B) can also be used. Examples of commercially available chain extenders (B) include the "Joncryl" ADR series from BASF, the "Alphon" series from Toagosei Co., Ltd., the "Marproof" series from NOF Corporation, the "Bondfast" series from Sumitomo Chemical Co., Ltd., and the "Rotada" series from SK Chemical Co., Ltd. Chain extenders (B) may be used individually or in combination of two or more in any ratio.

[0037] [Condition (1)] The masterbatch satisfies the above condition (1) with respect to the content of the chain extender (B) in the masterbatch. That is, the content of the chain extender (B) in the masterbatch is 0.10% by mass or more and 25% by mass or less, based on the total mass of the masterbatch. Preferably, the content of the chain extender (B) in the masterbatch is 2.0% by mass or more and 25% by mass or less, more preferably 3.0% by mass or more and 20% by mass or less, and even more preferably 5.0% by mass or more and 18% by mass or less, based on the total mass of the masterbatch. Because the content of the chain extender (B) in the masterbatch is within the above range, when the masterbatch is diluted with the diluent polycarbonate resin (C), a resin composition with good processability and moldability is obtained, as well as low yellowness, and when a transparent diluent PC resin (C) is used, a resin composition with even better transparency is more likely to be obtained.

[0038] If the content of chain extender (B) in the masterbatch is less than 0.10% by mass, even if the masterbatch is melt-kneaded with the diluent PC resin (C), the concentration of chain extender (B) is too low to effectively incorporate chain extender (C). On the other hand, if the content of chain extender (B) in the masterbatch exceeds 25% by mass, it becomes difficult to uniformly mix the PC resin (A) and chain extender (B) when manufacturing the masterbatch by melt-kneading the PC resin (A) and chain extender (B). Specifically, the chain extender (B) tends to appear as a liquid on the surface of the mixture during the masterbatch manufacturing process, making it difficult for the mixture to solidify and thus making it difficult to produce the masterbatch.

[0039] [Condition (2)] As mentioned above, condition (2) is also necessary when diluting the masterbatch with the diluent polycarbonate resin (C) to obtain the desired resin composition. That is, the masterbatch must be used after being mixed with the diluent polycarbonate resin (C) under the condition that the content of the chain extender (B) in the resin composition containing the masterbatch and the diluent polycarbonate resin (C) is between 0.05% by mass and 2.5% by mass.

[0040] From the viewpoint of improving the moldability of the resin composition, the content of the chain extender (B) in the resin composition under condition (2) is preferably 0.10% by mass or more, more preferably 0.20% by mass or more, even more preferably 0.25% by mass or more, and particularly preferably 0.30% by mass or more. On the other hand, from the viewpoint of improving the transparency of the resin composition when a transparent diluting PC resin (C) is used, the content of the chain extender (B) in the resin composition under condition (2) is preferably 2.3% by mass or less, more preferably 2.0% by mass or less, and even more preferably 1.6% by mass or less.

[0041] [Condition (3)] From the viewpoint of making it easier to obtain the target resin composition when the masterbatch is diluted with the diluent polycarbonate resin (C), it is preferable that the masterbatch satisfies the following condition (3). Condition (3): The content of the chain extender (B) in the masterbatch in the above Condition (1) is 2.0% by mass or more and 25% by mass or less based on the total mass of the masterbatch. In addition, the melt mass flow rate (hereinafter referred to as "MFR"

[0042] , , a , a , a , a ,

[0043] , b , , b , , b , a , , b , a ") of the polycarbonate resin (C1) which is 19 g / 10 min or more and 20 g / 10 min or less after being melt-kneaded alone, and the masterbatch are melt-kneaded at a ratio such that the content of the chain extender (B) becomes 1.0% by mass. When the melt mass flow rate of the resin composition sample obtained is MFR b (g / 10 min), 0 < MFR a - MFR b < 15.

[0042] The polycarbonate resin (C1) in which MFR a in Condition (3) is 19 g / 10 min or more and 20 g / 10 min or less can be used as the diluting PC resin (C), and is used as the raw material of the resin composition sample for measuring MFR b . Also, since the resin composition sample in Condition (3) is obtained by melt-kneading the diluting PC resin (C1) having the above specific MFR a and the masterbatch, for the MFR a of the diluting PC resin (C1) as well, the MFR a measured for the resin obtained by melt-kneading the diluting PC resin (C1) alone is adopted. In the present disclosure, the "melt mass flow rate (MFR)" is a physical property value (unit: g / 10 min) measured under the conditions of a temperature of 280°C and a load of 21.2 N in accordance with the test methods specified in JIS K7210-2 and ISO1133-2. MFR generally depends on the molecular weight of the polymer and is used as a measure of the molecular weight.

[0043] In the case of Condition (3), the MFR b of the above resin composition sample is smaller than the MFR a of the resin obtained by melt-kneading the diluting PC resin (C1) alone (MFR b < MFR a ). If MFR b=MFR a In that case, MFR a -MFR b = 0, which indicates that the same MFR is observed regardless of whether or not the masterbatch is added to the dilution PC resin (C1) mentioned above. Also, assuming MFR b >MFR a In that case, MFR a -MFR b <0 indicates that when the masterbatch is added to the dilution PC resin (C1) mentioned above, the MFR increases. From the viewpoint of obtaining a resin composition with better moldability, MFR b is MFR a Smaller is preferable. Furthermore, from the viewpoint of obtaining a resin composition with better transparency when using a diluent PC resin (C) which has better moldability, lower yellowness, and transparency, MFR a -MFR b It is preferable that the amount is less than 15g / 10min.

[0044] As mentioned above, MFR a and MFR b Difference (MFR) a -MFR b ) is preferably greater than 0g / 10min and less than 15g / 10min. a -MFR b Regarding the MFR value, near the lower limit (values ​​above 0 but close to 0), larger values ​​tend to improve moldability. On the other hand, near the upper limit (values ​​below 15 but close to 15), smaller values ​​tend to improve transparency and decrease yellowness. a and MFR b Difference (MFR) a -MFR b ) is 0.05g / 10min to 8.0g / 10min (0.05≦MFR) a -MFR b It is preferable that the MFR is ≤8.0. a -MFR bWhen the value is within the above preferred range, it is easier to obtain a resin composition with better processability and moldability, as well as lower yellowness, and even better transparency when using a diluent PC resin (C) that is transparent.

[0045] Furthermore, the MFR after melting and kneading as described above a To select a dilution PC resin (C1) with a MFR of 19g / 10min to 20g / 10min, it is recommended to select a dilution PC resin (C) with an MFR of 18.5g / 10min to 19.5g / 10min before melting and kneading alone.

[0046] [Condition (4)] From the viewpoint of making it easier to obtain the target resin composition when the masterbatch is diluted with the diluent polycarbonate resin (C), it is preferable that the masterbatch further satisfies the following condition (4). Condition (4): The content of the chain extender (B) in the masterbatch in the above condition (1) is 2.0% by mass or more and 25% by mass or less, based on the total mass of the masterbatch. Furthermore, the yellowness of the polycarbonate resin (C1) after melt-kneading alone is set to YI as defined in JIS K7373. a The yellowness of the resin composition sample obtained by melt-kneading this polycarbonate resin (C1) and the masterbatch in a ratio such that the chain extender (B) content is 1.0% by mass is defined as YI in JIS K7373. b When that happens, 0 <YI a -YI b <1

[0047] The polycarbonate resin (C1) in condition (4) is the same as the MFR after melt-kneading alone in condition (3) described above. a The polycarbonate resin (C1) has a concentration of 19 g / 10 min or more and 20 g / 10 min or less. Furthermore, since the resin composition sample under condition (4) is obtained by melt-kneading the dilution PC resin (C1) and the masterbatch, the yellowness YI of the dilution PC resin (C1) aRegarding this as well, the yellowness YI is measured for the resin obtained by melting and kneading dilution PC resin (C1) alone. a The yellowness is a value specified in JIS K7373, which depends on the heat resistance of the polycarbonate resin (C1) and is used as an indicator of its susceptibility to hydrolysis.

[0048] In the case of condition (4), the yellowness YI of the above resin composition sample. b This refers to the yellowness YI of the resin obtained by melting and kneading the above dilution PC resin (C1) alone. a Smaller (YI a >YI b ). For example, YI a =YI b In that case, YI a -YI b = 0, which indicates that the same degree of yellowness is observed regardless of whether or not the masterbatch is added to the dilution PC resin (C1) mentioned above. Therefore, from the viewpoint of obtaining a resin composition with better transparency when using a transparent dilution PC resin (C), YI a -YI b The value of is preferably greater than 0 and less than 1.

[0049] In this disclosure, the yellowness (YI value) can be a value measured as follows: Using a spectrophotometer (product name "CM-3600A", manufactured by Konica Minolta), the sample is measured by transmission in a D65 light source and a 10-degree field of view, and the L value is obtained. * a * b * L in color systems * value, a * value, and b * The value is measured. Then, the yellowness (YI value) can be calculated in accordance with the provisions of JIS K7373.

[0050] (Polycarbonate resin for dilution (C)) The diluting polycarbonate resin (C) is a resin used to dilute the masterbatch, and when mixed with the masterbatch, it constitutes the resin composition together with the masterbatch. The diluting PC resin (C) may be used alone, or two or more types may be combined in any ratio. The diluting PC resin (C) is usually a resin having constituent units derived from aromatic diols and constituent units derived from carbonate derivatives.

[0051] The dilution PC resin (C) may be obtained by any synthesis method. Polycarbonate can be synthesized, for example, by interfacial polycondensation between bisphenol A and phosgene, or by melt polycondensation (transesterification reaction) between bisphenol A and diphenyl carbonate. Alternatively, ethylene carbonate can be synthesized from the starting materials carbon dioxide (CO2) and ethylene oxide using a catalyst, converted to diphenyl carbonate, and then polymerized with bisphenol A to synthesize polycarbonate. Furthermore, dialkyl carbonate can be produced directly from CO2 and alcohol using a predetermined catalyst to produce diphenyl carbonate, and then polycarbonate can be synthesized by polymerizing this diphenyl carbonate with bisphenol A.

[0052] Polycarbonate resin is a polymer with a basic structure having carbonate bonds, represented by the general formula: -[-OXOC(=O)-]-. In the above general formula, X is generally a hydrocarbon group, but heteroatoms and heterobonded X may be used to impart various properties. Furthermore, polycarbonate resins can be classified into aromatic polycarbonate resins, in which the carbons directly bonded to the carbonate bonds are aromatic carbons, and aliphatic polycarbonate resins, in which the carbons are aliphatic carbons, and both can be used. Among these, aromatic polycarbonate resins are preferred.

[0053] The specific type of polycarbonate resin is not particularly limited, but examples include polycarbonate polymers obtained by reacting a dihydroxy compound with a carbonate precursor. In this case, polyhydroxy compounds may also be reacted in addition to the dihydroxy compound and the carbonate precursor. Alternatively, a method may be used in which carbon dioxide is used as the carbonate precursor and reacted with a cyclic ether. The polycarbonate polymer may be linear or branched. Furthermore, the polycarbonate polymer may be a monopolymer consisting of one type of repeating unit, or a copolymer having two or more types of repeating units. In this case, various copolymerization forms such as random copolymers and block copolymers can be selected. Typically, such polycarbonate polymers are thermoplastic resins.

[0054] Examples of the above-mentioned dihydroxy compounds include aromatic dihydroxy compounds and aliphatic dihydroxy compounds. Examples of aromatic dihydroxy compounds include dihydroxybenzenes, dihydroxybiphenyls, dihydroxynaphthalenes, dihydroxydiaryl ethers, bis(hydroxyaryl)alkanes, bis(hydroxyaryl)cycloalkanes, bisphenols containing cardo structures, dihydroxydiaryl sulfides, dihydroxydiaryl sulfoxides, and dihydroxydiarylsulfones. Examples of aliphatic dihydroxy compounds include alkanediols, cycloalkanediols, glycols, and aralkyldiols. Any of the above-mentioned raw materials may be used individually or in combination of two or more in any ratio.

[0055] Examples of the above-mentioned dihydroxybenzenes include 1,2-dihydroxybenzene, 1,3-dihydroxybenzene (i.e., resorcinol), and 1,4-dihydroxybenzene.

[0056] Examples of the dihydroxybiphenyl compounds mentioned above include 2,5-dihydroxybiphenyl, 2,2'-dihydroxybiphenyl, and 4,4'-dihydroxybiphenyl.

[0057] Examples of the above-mentioned dihydroxynaphthalenes include 2,2'-dihydroxy-1,1'-binaphthyl, 1,2-dihydroxynaphthalene, 1,3-dihydroxynaphthalene, 2,3-dihydroxynaphthalene, 1,6-dihydroxynaphthalene, 2,6-dihydroxynaphthalene, 1,7-dihydroxynaphthalene, and 2,7-dihydroxynaphthalene.

[0058] Examples of the above-mentioned dihydroxydiaryl ethers include 2,2'-dihydroxydiphenyl ether, 3,3'-dihydroxydiphenyl ether, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3,3'-dimethyldiphenyl ether, 1,4-bis(3-hydroxyphenoxy)benzene, and 1,3-bis(4-hydroxyphenoxy)benzene.

[0059] Examples of the above bis(hydroxyaryl)alkanes include 2,2-bis(4-hydroxyphenyl)propane (i.e., bisphenol A), 1,1-bis(4-hydroxyphenyl)propane, 2,2-bis(3-methyl-4-hydroxyphenyl)propane, 2,2-bis(3-methoxy-4-hydroxyphenyl)propane, 2-(4-hydroxyphenyl)-2-(3-methoxy-4-hydroxyphenyl)propane, 1,1-bis(3-tert-butyl-4-hydroxyphenyl)propane, and 2,2-bis(4-hydroxyphenyl) (Loxy-3,5-dimethylphenyl)propane, 2,2-bis(3-cyclohexyl-4-hydroxyphenyl)propane, 2-(4-hydroxyphenyl)-2-(3-cyclohexyl-4-hydroxyphenyl)propane, α,α'-bis(4-hydroxyphenyl)-1,4-diisopropylbenzene, 1,3-bis[2-(4-hydroxyphenyl)-2-propyl]benzene, bis(4-hydroxyphenyl)methane, bis(4-hydroxyphenyl)cyclohexylmethane, bis(4-hydroxyphenyl)phenylmethane, bis Su(4-hydroxyphenyl)(4-propenylphenyl)methane, bis(4-hydroxyphenyl)diphenylmethane, bis(4-hydroxyphenyl)naphthylmethane, 1-bis(4-hydroxyphenyl)ethane, 2-bis(4-hydroxyphenyl)ethane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, 1,1-bis(4-hydroxyphenyl)-1-naphthylethane, 1-bis(4-hydroxyphenyl)butane, 2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)pentylethane Examples include tan, 1,1-bis(4-hydroxyphenyl)hexane, 2,2-bis(4-hydroxyphenyl)hexane, 1-bis(4-hydroxyphenyl)octane, 2-bis(4-hydroxyphenyl)octane, 1-bis(4-hydroxyphenyl)hexane, 2-bis(4-hydroxyphenyl)hexane, 4,4-bis(4-hydroxyphenyl)heptane, 2,2-bis(4-hydroxyphenyl)nonane, 10-bis(4-hydroxyphenyl)decane, and 1-bis(4-hydroxyphenyl)dodecane.

[0060] Examples of the above-mentioned bis(hydroxyaryl)cycloalkanes include 1-bis(4-hydroxyphenyl)cyclopentane, 1-bis(4-hydroxyphenyl)cyclohexane, 4-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3-dimethylcyclohexane, 1-bis(4-hydroxyphenyl)-3,4-dimethylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3,5-dimethylcyclohexane, and 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexyl Examples include 1,1-bis(4-hydroxy-3,5-dimethylphenyl)-3,3,5-trimethylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3-propyl-5-methylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3-tert-butyl-cyclohexane, 1,1-bis(4-hydroxyphenyl)-3-tert-butyl-cyclohexane, 1,1-bis(4-hydroxyphenyl)-3-phenylcyclohexane, and 1,1-bis(4-hydroxyphenyl)-4-phenylcyclohexane.

[0061] Examples of bisphenols containing the above-mentioned cardo structure include 9,9-bis(4-hydroxyphenyl)fluorene and 9,9-bis(4-hydroxy-3-methylphenyl)fluorene.

[0062] Examples of the above-mentioned dihydroxydiaryl sulfides include 4,4'-dihydroxydiphenyl sulfide and 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfide.

[0063] Examples of the above-mentioned dihydroxydiaryl sulfoxides include 4,4'-dihydroxydiphenyl sulfide and 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfide.

[0064] Examples of the above dihydroxydiarylsulfones include 4,4'-dihydroxydiarylsulfones. Examples include cydiphenyl sulfone and 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfone.

[0065] Examples of the above-mentioned alkanediols include ethane-1,2-diol, propane-1,2-diol, propane-1,3-diol, 2,2-dimethylpropane-1,3-diol, 2-methyl-2-propylpropane-1,3-diol, butane-1,4-diol, pentane-1,5-diol, hexane-1,6-diol, and decane-1,10-diol.

[0066] Examples of the above-mentioned cycloalkanediols include cyclopentane-1,2-diol, cyclohexane-1,2-diol, cyclohexane-1,4-diol, 1,4-cyclohexanedimethanol, 4-(2-hydroxyethyl)cyclohexanol, and 2,2,4,4-tetramethyl-cyclobutane-1,3-diol.

[0067] Examples of the glycols mentioned above include 2,2'-oxydiethanol (i.e., ethylene glycol), diethylene glycol, triethylene glycol, propylene glycol, and spiroglycol.

[0068] Examples of the above-mentioned aralkyldiols include 1,2-benzenedimethanol, 1,3-benzenedimethanol, 1,4-benzenedimethanol, 1,4-benzenediethanol, 1,3-bis(2-hydroxyethoxy)benzene, 1,4-bis(2-hydroxyethoxy)benzene, 2,3-bis(hydroxymethyl)naphthalene, 1,6-bis(hydroxyethoxy)naphthalene, 4,4'-biphenyldimethanol, 4,4'-biphenyldiethanol, 1,4-bis(2-hydroxyethoxy)biphenyl, bisphenol A bis(2-hydroxyethyl) ether, and bisphenol S bis(2-hydroxyethyl) ether.

[0069] Examples of the carbonate precursors mentioned above include carbonyl halides, carbonate esters, and carbon dioxide. Examples of carbonyl halides include phosgene, and haloformates such as bischloroformates and monochloroformates of dihydroxy compounds. Specific examples of carbonate esters include diaryl carbonates such as diphenyl carbonate and ditril carbonate; dialkyl carbonates such as dimethyl carbonate and diethyl carbonate; and carbonates of dihydroxy compounds such as biscarbonates, monocarbonates, and cyclic carbonates. The carbonate precursors may be used individually or in combination of two or more in any ratio.

[0070] Examples of the above-mentioned cyclic ethers include 1,2-epoxyethane (i.e., ethylene oxide), 1,2-epoxypropane (i.e., propylene oxide), 1,2-epoxycyclopentane, 1,2-epoxycyclohexane, 1,4-epoxycyclohexane, 1-methyl-1,2-epoxycyclohexane, and 2,3-epoxynorbornane. The above-mentioned cyclic ethers may be used individually or in combination of two or more in any ratio.

[0071] Any of the above-described methods for synthesizing the diluent PC resin (C) or using its raw materials may be employed. In particular, a polycarbonate resin (C) having a melt mass flow rate (MFR) of 0.5 g / 10 min or more and 80 g / 10 min or less is preferred as the diluent PC resin (C). Furthermore, a polycarbonate resin (C) recycled by chemical recycling or mechanical recycling may also be used as the diluent PC resin (C).

[0072] Commercially available PC resin (C) may be used as the diluent. Examples of commercially available PC resin (C) include the "Panlight" series from Teijin Corporation, the "Novarex" and "Upilon" series from Mitsubishi Engineering Plastics Corporation, the "INFINO" series from Lotte Chemical Corporation, the "SD Polycarbonate" series from Sumika Polycarbonate Corporation, and the "Toughlon" series from Idemitsu Kosan Corporation.

[0073] (Other ingredients) The masterbatch may contain other components as needed, in addition to the polycarbonate resin (A) and chain extender (B) described above. Examples of other components include glass fibers, carbon fibers, resins other than polycarbonate resin (other resins), pigments, fillers, surface treatment agents, lubricants, plasticizers, crosslinking agents, UV absorbers, light stabilizers, antioxidants, antistatic agents, antibacterial agents, flame retardants, and foaming agents. One of the other components may be used alone, or two or more may be used in combination. Furthermore, the other components may be mixed with the polycarbonate resin (A) before the masterbatch is manufactured. That is, a polycarbonate resin composition (polycarbonate resin (A) composition) containing the polycarbonate resin (A) and other components may be used during the manufacture of the masterbatch.

[0074] In fields where transparency is not required, at least one fiber among glass fibers and carbon fibers is preferred among the other components from the viewpoint of increasing the strength of the PC resin. Glass fibers can be used in various forms such as roving, cloth, chopped strand mat, tape, or yarn. Carbon fibers include PAN-based and pitch-based types, and either can be used.

[0075] <How to manufacture a masterbatch> A masterbatch can be produced by melt-kneading a material containing a polycarbonate resin (A) and a chain extender (B). During this melt-kneading process, other components as described above may be added as needed.

[0076] One method for melt-mixing to obtain a masterbatch is to pre-mix the materials containing polycarbonate resin (A) and chain extender (B) using a high-speed mixer such as a Henschel mixer or a mixer such as a tumbler, and then melt-mix them using a mixing device. Examples of mixing devices include Banbury mixers, rolls, plastographs, single-screw extruders, twin-screw extruders, kneaders, and pressure kneaders. The materials may be melt-mixed using a mixing device such as an extruder, and the mixed material may be extruded into strands, which may then be processed into pellets or flakes. The mixing device used is not particularly limited as long as it can melt-mix, but pressure kneaders, Banbury mixers, or twin-screw extruders are preferred due to their high mixing capacity. Furthermore, from the viewpoint of ease of use when obtaining a resin composition, it is preferable that the masterbatch is processed as described above and is in the form of pellets or flakes.

[0077] The temperature during melt-mixing to obtain the masterbatch should be any temperature at which the thermoplastic resin containing the polycarbonate resin (A) melts, preferably between 250°C and 300°C, and more preferably between 270°C and 290°C. The melt-mixing to obtain the masterbatch may be carried out in one stage or in two stages. In the two-stage melt-mixing, for example, a portion of the PC resin (A) and chain extender (B) is melt-mixed, and the extruded mixture is processed into a pellet or flake form. Then, the remaining PC resin (A) and chain extender (B), as well as other components as needed, are added to the pellet or flake mixture, and the mixture is melt-mixed again.

[0078] As detailed above, the masterbatch of this embodiment contains a polycarbonate resin (A) and a specific chain extender (B), and satisfies both of the aforementioned conditions (1) and (2). Therefore, when this masterbatch is diluted with a diluent PC resin (C), it is possible to obtain a resin composition that has good processability and moldability, low yellowness, and, if a diluent PC resin (C) that is transparent is used, is less prone to clouding and has good transparency. Thus, the effect of the masterbatch is realized by mixing (melt kneading) the diluent PC resin (C), which is the diluent resin, with the masterbatch. If the PC resin (A), chain extender (B), and diluent PC resin (C) are melt-kneaded without preparing a masterbatch, the chain extender (B) will react locally, and as a result, the kneaded product is likely to become a non-uniform resin composition.

[0079] <Resin composition> The resin composition of one embodiment of the present invention contains the aforementioned masterbatch and the aforementioned polycarbonate resin (C). The total content of the masterbatch and PC resin (C) in the resin composition is preferably 50% by mass or more, more preferably 60% by mass or more, and even more preferably 70% by mass or more, based on the total mass of the resin composition. The upper limit of the total content of the masterbatch and PC resin (C) in the resin composition is not particularly limited, and for example, it may be 100% by mass based on the total mass of the resin composition. Therefore, the total content of the masterbatch and PC resin (C) in the resin composition may be 99% by mass or more and 100% by mass or less, based on the total mass of the resin composition.

[0080] [Condition (5)] From the viewpoint of having better processability and moldability, and better transparency when using a transparent PC resin (C), it is preferable that the resin composition satisfies the following condition (5). Condition (5): The melt mass flow rate of polycarbonate resin (C) after melting and kneading alone is MFR c (g / 10min) is used, and the melt mass flow rate of the resin composition is MFR d When (g / 10min), 0 <MFR c-MFR d It is <40.

[0081] The PC resin (C) in condition (5) is the PC resin (C) contained in the resin composition. Furthermore, since the resin composition in condition (5) is obtained by melt-kneading a material containing the PC resin (C) and a masterbatch, the MFR of the PC resin (C) c Regarding this as well, the MFR measured for the resin obtained by melt-kneading the PC resin (C) alone c Take it.

[0082] In the case of condition (5), the MFR of the resin composition d This is the MFR of the resin obtained by melt-kneading the above PC resin (C) alone. c Smaller (MFR) d <MFR c ). For example, MFR d =MFR c In that case, MFR c -MFR d = 0, which indicates that the same MFR is observed regardless of whether or not the masterbatch is added to the PC resin (C) mentioned above. Also, assuming MFR d >MFR c In that case, MFR c -MFR d <0 indicates that when a masterbatch is added to the above PC resin (C), the MFR increases. From the viewpoint of making the moldability of the resin composition easier to improve, MFR d is MFR c Smaller is preferable. Furthermore, from the viewpoint of having better moldability of the resin composition, lower yellowness, and greater transparency when using PC resin (C), MFR c -MFR d It is preferable that the amount is less than 40g / 10min.

[0083] As mentioned above, MFR c and MFR d Difference (MFR) c -MFR d) is preferably greater than 0 g / 10 min and less than 40 g / 10 min. MFR c -MFR d Regarding the value of, near the lower limit (a value near 0 exceeding 0), the larger the numerical value, the easier it is for the moldability to be good. On the other hand, near the upper limit (a value near 40 less than 40), the smaller the numerical value, the easier it is for the transparency to be good, and the yellowness is also likely to decrease. MFR c and MFR d The difference (MFR c -MFR d ) is preferably 0.05 g / 10 min or more and 35 g / 10 min or less (0.05 ≦ MFR c -MFR d ≦ 35). MFR c -MFR d When the value of is within the above preferred range, the processability and moldability of the resin composition are more likely to be good, and the yellowness is more likely to be lower. Furthermore, when a PC resin (C) having transparency is used, the transparency is more likely to be good.

[0084] The polycarbonate resin (C) contained in the resin composition is as described in the explanation of the masterbatch. From the viewpoint of enhancing the effect of the masterbatch, the polycarbonate resin (C) preferably contains the following polycarbonate resins. That is, the polycarbonate resin (C) preferably contains a polycarbonate resin (C) having a melt mass flow rate (MFR) of 0.5 g / 10 min or more and 80 g / 10 min or less. Also, the polycarbonate resin (C) preferably contains a recycled polycarbonate resin. Examples of the recycled polycarbonate resin include polycarbonate resins recycled by chemical recycling (chemical recycling method) or mechanical recycling (physical recycling method).

[0085] The mixing ratio of the masterbatch and the polycarbonate resin (C) is preferably such that the masterbatch content is 0.40% by mass or more and 50% by mass or less relative to the total mass of the masterbatch and the polycarbonate resin (C). A masterbatch content of 0.40% by mass or more tends to result in good moldability of the resin composition. On the other hand, a masterbatch content of 50% by mass or less suppresses the content of the chain extender (B) in the resin composition, resulting in an appropriate number of crosslinking points. This suppresses clouding, and when using a transparent PC resin (C), it becomes easier to obtain a resin composition with good transparency. From these viewpoints, the masterbatch content relative to the total mass of the masterbatch and the PC resin (C) is more preferably 1.0% by mass or more and 20% by mass or less, and even more preferably 3.0% by mass or more and 15% by mass or less.

[0086] Since the resin composition contains a masterbatch that satisfies the above-mentioned condition (2), the content of the chain extender (B) in the resin composition is 0.05% by mass or more and 2.5% by mass or less based on the total mass of the resin composition. In other words, the materials containing the masterbatch and the diluent polycarbonate resin (C) are mixed so that the content of the chain extender (B) in the resin composition is 0.05% by mass or more and 2.5% by mass or less.

[0087] From the viewpoint of improving the moldability of the resin composition, the content of the chain extender (B) in the resin composition is preferably 0.10% by mass or more, more preferably 0.20% by mass or more, even more preferably 0.25% by mass or more, and particularly preferably 0.30% by mass or more. On the other hand, from the viewpoint of improving the transparency of the resin composition when using a transparent PC resin (C), the content of the chain extender (B) in the resin composition is preferably 2.3% by mass or less, more preferably 2.0% by mass or less, and even more preferably 1.6% by mass or less.

[0088] (Other ingredients) The resin composition may contain other components as needed, in addition to the masterbatch and PC resin (C) described above. Other components may include those that are also included in the masterbatch. The other components included in the resin composition may be included in the masterbatch, or they may be included separately from the masterbatch by being mixed together with the masterbatch and diluent PC resin (C). Furthermore, the other components may be mixed with diluent PC resin (C) beforehand before producing the resin composition by mixing the materials containing the masterbatch and diluent PC resin (C). In other words, a diluent PC resin composition (PC resin (C) composition) containing diluent PC resin (C) and other components may be used when producing the above resin composition.

[0089] In fields where transparency is not required, and from the viewpoint of increasing the strength of the PC resin, it is preferable that the resin composition, in one embodiment, further contains at least one type of fiber, such as glass fiber and carbon fiber, among the other components. Glass fiber can be used in various forms such as roving, cloth, chopped strand mat, tape, or yarn. Carbon fiber can be PAN-based or pitch-based, and either can be used. These fibers are preferably mixed with PC resin (C) beforehand before manufacturing the resin composition, and it is preferable that a PC resin (C) composition containing PC resin (C) and the above-mentioned fibers is used when manufacturing the resin composition.

[0090] The content of the above-mentioned fibers (glass fibers and / or carbon fibers) is preferably 10% by mass or more and 30% by mass or less, based on the total mass of polycarbonate resin (C) and fibers. Glass fibers and / or carbon fibers may be added to PC resin (C), or commercially available PC resin (C) containing glass fibers and / or carbon fibers (polycarbonate resin (C) composition) may be used. Examples of commercially available PC containing glass fibers and / or carbon fibers include the "Panlight" series from Teijin Corporation, the "Novarex" series and "Upilon" series from Mitsubishi Engineering Plastics Corporation, the "INFINO" series from Lotte Chemical Corporation, the "SD Polycarbonate" series from Sumika Polycarbonate Corporation, and the "Toughlon" series from Idemitsu Kosan Corporation.

[0091] Furthermore, among the other components, the resin composition preferably contains, in one embodiment, the following additional resins. In this case, the additional resin is at least one resin selected from the group consisting of ABS resin (acrylonitrile-butadiene-styrene copolymer), acrylic resin, polyethylene terephthalate (PET) resin, and polybutylene terephthalate (PBT) resin. When the resin composition further contains ABS resin, improved fluidity and impact resistance of the resin composition can be expected. When the resin composition further contains acrylic resin, improved hardness, gloss, and scratch resistance of the resin composition can be expected. Furthermore, when the resin composition further contains PET resin, improved fluidity, chemical resistance, and impact resistance of the resin composition can be expected. Furthermore, when the resin composition further contains PBT resin, improved chemical resistance and low-temperature molding of the resin composition can be expected. The above additional resins are preferably mixed with PC resin (C) in advance before manufacturing the resin composition, and it is preferable that a PC resin (C) composition containing PC resin (C) and the above additional resins is used when manufacturing the resin composition. For example, a PC resin (C) composition in which PC resin (C) is alloyed with other resins can be used.

[0092] The melt mass flow rate (MFR) of the resin composition is preferably 0.5 g / 10 min to 80 g / 10 min. Resin compositions within this MFR range can be applied to a variety of uses, and are used for more appropriate applications depending on the MFR value. In one embodiment, when the MFR of the resin composition is 20 g / 10 min to 80 g / 10 min, it is preferable to use the resin composition for optical discs, precision parts (e.g., cameras and lenses), or medical devices. When the MFR of the resin composition is 2 g / 10 min to less than 20 g / 10 min, it is preferable to use the resin composition for automobile parts, helmets, or building materials. Furthermore, when the MFR of the resin composition is 0.5 g / 10 min to less than 2 g / 10 min, it is preferable to use the resin composition for bulletproof materials. By using the aforementioned masterbatch, it is possible to obtain a resin composition in which the MFR of the diluting PC resin (C), which is particularly prone to degradation during recycling, is brought close to the same level as before recycling, thereby enabling horizontal recycling.

[0093] <Method for producing resin compositions> A resin composition can be manufactured by mixing a masterbatch and a diluent PC resin (C). For example, when the resin composition is to be used as a molding resin material by methods such as injection molding, it can be manufactured by melt-kneading a material containing a masterbatch and a diluent PC resin (C). During this melt-kneading process, other components as described above may be added as needed. Alternatively, a resin composition can be manufactured as a molded resin article by mixing a material containing a masterbatch and a diluent PC resin (C) and molding it by injection molding or the like.

[0094] One method for melt-kneading a resin composition is to pre-mix the materials containing the masterbatch and diluting PC resin (C) using a high-speed mixer such as a Henschel mixer or a mixer such as a tumbler, and then melt-knead them using a kneading device. Examples of kneading devices include Banbury mixers, rolls, plastographs, single-screw extruders, twin-screw extruders, kneaders, and pressure kneaders. The materials may be melt-kneaded using a kneading device such as an extruder, and the kneaded material may be extruded into strands, which may then be processed into pellets or flakes. The kneading device used is not particularly limited as long as it can melt-knead, but pressure kneaders, Banbury mixers, or twin-screw extruders are preferred due to their high kneading capacity. Furthermore, when obtaining a resin molded article from the resin composition, it is preferable that the resin composition is processed as described above to be in pellet or flake form so that it is easy to mold in a molding machine.

[0095] The temperature during melt-kneading to obtain the resin composition should be the temperature at which the diluent PC resin (C) melts, preferably 250°C to 300°C, and more preferably 270°C to 290°C. The melt-kneading to obtain the resin composition may be carried out in one stage or in two stages. In the two-stage melt-kneading, for example, a portion of the masterbatch and diluent PC resin (C) is melt-kneaded, and the extruded mixture is processed into a pellet or flake form. Then, the remaining masterbatch and diluent PC resin (C), as well as other components as needed, are added to the pellet or flake mixture, and the mixture is melt-kneaded again.

[0096] As described in detail above, the resin composition of this embodiment contains the aforementioned masterbatch, and therefore has good processability and moldability, as well as low yellowness, and when using transparent PC resin (C), it can also have good transparency. Therefore, as will be explained in the embodiments of the resin molded articles described later, various types of resin molded articles can be manufactured by selecting various appropriate molding methods. Furthermore, by using the resin composition, it is possible to manufacture resin molded articles with low haze values ​​and resin molded articles with low yellowness, as will be described later.

[0097] <Resin molded product> A resin molded article of one embodiment of the present invention is a molded article of the aforementioned resin composition. The resin molded article can be manufactured by molding the resin composition. For example, as described above, a resin molded article can be manufactured by molding a resin composition as a molding resin material obtained by melt-kneading a material containing a masterbatch and diluent PC resin (C). Alternatively, a resin molded article can be manufactured by molding a resin composition (mixture) obtained by dry-blending a material containing a masterbatch and diluent PC resin (C). Examples of molding methods include extrusion molding, T-die extrusion molding, injection molding, injection blow molding, blow molding, compression molding, and melt spinning. This makes it possible to provide a resin molded article with good transparency and low yellowness for use as building materials, civil engineering materials, automobile parts, transportation equipment parts, electrical and electronic equipment parts, medical equipment parts, daily necessities, general merchandise, bulletproof materials, sign materials, or optical components.

[0098] Since the resin molded article is a molded article of a resin composition containing the aforementioned masterbatch, it is possible to have good transparency when a diluent PC resin (C) with low yellowness and transparency is used. Specifically regarding transparency, the resin molded article preferably has a haze value of 0.0% or more and 2.0% or less as defined in JIS K7136, more preferably 1.5% or less, and even more preferably 1.0% or less. The haze value of the resin molded article can be a value measured in accordance with the provisions of JIS K7136.

[0099] Furthermore, the resin molded article preferably has a yellowness (YI value) of 3 or less, more preferably 2 or less, and even more preferably 1 or less, as defined in JIS K7373. In applications with a high number of passes (number of times processed in a kneader or extruder), repeated heat is applied, which tends to accelerate yellowing, but a yellowness (YI value) of 3 or less is sufficient. The yellowness (YI value) of the resin molded article can be a value measured in accordance with the provisions of JIS K7373.

[0100] As mentioned above, one embodiment of the present invention can have the following configuration. [1] A masterbatch for polycarbonate resin (C), A polycarbonate resin (A) having a terminal hydroxyl group concentration of 400 ppm by mass or less, It contains a chain extender (B) having a weight-average epoxy functional group count of 3 or more and 65 or less, and a weight-average molecular weight of 2000 or more and 30000 or less, A masterbatch that satisfies the following conditions (1) and (2). Condition (1): The content of the chain extender (B) in the masterbatch is 0.10% by mass or more and 25% by mass or less, based on the total mass of the masterbatch. Condition (2): The masterbatch is used by mixing it with the polycarbonate resin (C) under the condition that the content of the chain extender (B) in the resin composition containing the masterbatch and the polycarbonate resin (C) in which the masterbatch is used is 0.05% by mass or more and 2.5% by mass or less. [2] The masterbatch according to [1] above, wherein the epoxy equivalent of the chain extender (B) is 100 g / mol or more and 1000 g / mol or less. [3] The content of the chain extender (B) in the masterbatch under condition (1) is 2.0% by mass or more and 25% by mass or less, based on the total mass of the masterbatch, Melt mass flow rate (MFR) after melting and kneading by itself a The melt mass flow rate of a resin composition sample obtained by melt-kneading a polycarbonate resin (C1) having a flow rate of 19 g / 10 min to 20 g / 10 min and the masterbatch in a proportion such that the chain extender (B) content is 1.0% by mass is measured as MFR. b When (g / 10min), 0 <MFR a -MFR b The masterbatch described in [1] or [2] above, which is <15. [4] The yellowness of the polycarbonate resin (C1) after melt-kneading by itself is defined as YI as specified in JIS K7373. a The yellowness of the resin composition sample as defined in JIS K7373 is YI b When that happens, 0 <YI a -YI b The masterbatch described in [3] above, which is <1. [5] A resin composition comprising the masterbatch described in any of [1] to [4] above and a polycarbonate resin (C). [6] The resin composition according to [5] above, wherein the melt mass flow rate (MFR) of the polycarbonate resin (C) is 0.5 g / 10 min or more and 80 g / 10 min or less. [7] The melt mass flow rate of the polycarbonate resin (C) after melting and kneading by itself is MFR c (g / 10min) The melt mass flow rate of the resin composition is set to MFR d When (g / 10min), 0 <MFR c -MFR d The resin composition described in [5] or [6] above, wherein the coefficient of the resin is <40. [8] The resin composition according to any one of [5] to [7] above, wherein the polycarbonate resin (C) comprises recycled polycarbonate resin. [9] The resin composition according to any one of the above [5] to [8] further contains at least one fiber selected from glass fibers and carbon fibers.

[10] The resin composition according to any one of the above [5] to [9] further comprises at least one resin selected from the group consisting of ABS resin, acrylic resin, polyethylene terephthalate resin, and polybutylene terephthalate resin.

[11] A resin composition according to any one of [5] to

[10] above, wherein the melt mass flow rate is 0.5 g / 10 min or more and 80 g / 10 min or less.

[12] The melt mass flow rate (MFR) of the resin composition is 20 g / 10 min or more and 80 g / 10 min or less. A resin composition according to any one of the above [5] to

[11] , for use in optical discs, precision components, or medical devices.

[13] The melt mass flow rate (MFR) of the resin composition is 2 g / 10 min or more and less than 20 g / 10 min, A resin composition according to any one of the above [5] to

[11] , for use in automotive parts, helmets, or building materials.

[14] The melt mass flow rate (MFR) of the resin composition is 0.5 g / 10 min or more and less than 2 g / 10 min, A resin composition according to any of the above [5] to

[11] , for use as a bulletproof material.

[15] A resin molded article which is a molded product of any of the resin compositions described in [5] to

[14] above.

[16] The resin molded article described in

[15] above, wherein the haze value specified in JIS K7136 is 0.0% or more and 2.0% or less.

[17] A resin molded article as described in

[15] or

[16] above, wherein the degree of yellowness (YI value) as defined in JIS K7373 is 3 or less.

[18] A resin molded article described in any of

[15] to

[17] above, which is a building material, civil engineering material, automobile part, transportation equipment part, electrical and electronic equipment part, medical equipment part, daily necessities, general merchandise, bulletproof material, sign material, or optical component. [Examples]

[0101] One embodiment of the present invention will be described in detail below based on examples, but one embodiment of the present invention is not limited to these examples.

[0102] <Preparing the materials> The following materials were prepared. The epoxy equivalent and weight-average molecular weight of the chain extender were measured using the following method. Furthermore, the weight-average number of epoxy functional groups of the chain extender was calculated using the weight-average molecular weight / epoxy equivalent ratio, using the measured epoxy equivalent and weight-average molecular weight. The MFR of the diluent PC resin (C) shown below is the value measured for the unprocessed resin before melt-kneading the diluent PC resin alone.

[0103] (Measurement of epoxy equivalent) The epoxy equivalent (g / mol) of the chain extender was determined by measurement in accordance with the provisions of JIS K7236.

[0104] (Measurement of weight-average molecular weight) The weight-average molecular weight of the chain extender was measured by GPC using the following equipment and conditions. • GPC device: Product name "HLC-8020" (manufactured by Tosoh Corporation) • Columns: Product names "TSKgel G2000HXL", "G3000HXL", "G4000GXL" (manufactured by Tosoh Corporation) • Solvent: Tetrahydrofuran (THF) ·Flow rate: 1.0mL / min • Sample concentration: 2g / L ·Injection volume: 100μL ·Temperature: 40℃ • Detector: Model number "RI-8020" (manufactured by Tosoh Corporation) • Standard material: TSK standard polystyrene (manufactured by Tosoh Corporation)

[0105] (Measurement of terminal hydroxyl group concentration) The concentration of terminal hydroxyl groups in PC resin was measured by colorimetric determination using the titanium tetrachloride / acetic acid method. First, 50 mL of acetic acid was added to a 1000 mL volumetric flask, and the mixture was turned up with methylene chloride to prepare a 5 vol. methylene chloride solution with acetic acid. Next, 90 mL of methylene chloride and 10 mL of the 5 vol. methylene chloride solution with acetic acid were measured into a 300 mL flask, and while stirring with a magnetic stirrer, 2.5 mL of titanium tetrachloride solution and 2.0 mL of methanol were slowly added using a volumetric pipette to prepare a titanium tetrachloride mixed solution.

[0106] Next, samples were prepared to create a calibration curve. Specifically, a methylene chloride solution with a terminal hydroxyl group of bisphenol A of 10 mg / L was prepared, and 0, 3, and 5 mL of this solution were added to 25 mL volumetric flasks. To each volumetric flask, 5 mL of methylene chloride solution with 5 vol% acetic acid and 10 mL of titanium tetrachloride mixed solution were added, and then the mixture was mixed by making up with methylene chloride. The absorbance of each prepared sample was measured under conditions of detection wavelength 546 nm. The obtained absorbances were plotted against the concentrations of the calibration curve samples, and the reciprocal of the slope was used as the factor.

[0107] To measure the terminal hydroxyl group concentration, 0.2 g of PC resin and 5 mL of methylene chloride were dissolved in a 25 mL volumetric flask. Then, 5 mL of a 5 vol% acetic acid methylene chloride solution and 10 mL of a titanium tetrachloride mixed solution were added, and the mixture was mixed up with methylene chloride to the final volume. The absorbance of the solution prepared in this way was measured at a detection wavelength of 546 nm. The number of terminal hydroxyl groups in the PC resin was calculated by dividing the product of the measured absorbance and the factor by the concentration of the sample, which was calculated using the viscosity-average molecular weight measured by the method described below.

[0108] (Measurement of viscosity-average molecular weight) The viscosity-average molecular weight of the PC resin was measured according to the following procedure. First, 0.35 g of PC resin was weighed into a 50 mL volumetric flask and diluted with methylene chloride at 20°C to obtain 50 mL of a solution in which the PC resin was dissolved. Next, the specific viscosity η was measured using a capillary-type automatic viscometer (manufactured by Shibayama Scientific Instruments Co., Ltd.). sp The following factors were calculated in order: (Equation (1)), intrinsic viscosity [η] (Equation (2)), and molecular weight M (Equation (3)). η sp =(t-t0) / t0···(1) (η sp (where ∫ is specific viscosity, t0 is the number of seconds for the methylene chloride to fall, and t is the number of seconds for the sample solution to fall) [η]={-1+(1+4K'η sp ) 0.5} / 2K'c ···(2) ([η] is the intrinsic viscosity, K' is the viscosity constant of the solute (K'=0.45), and c is the mass concentration of the solution (c=0.7) [η] = 1.23 × 10 -4 M 0.83 ...(3)

[0109] (Polycarbonate resin (A)) • A-1: ​​Product name "Panlite L-1225WP" (manufactured by Teijin, viscosity-average molecular weight 22400, terminal hydroxyl group concentration 220 ppm by mass) • A-2: Product name "Panlite L-1225" (manufactured by Teijin, viscosity-average molecular weight 22000, terminal hydroxyl group concentration 250 ppm by mass) • A-3: Product name "SD Polycarbonate 301-22" (manufactured by Sumika Polycarbonate Co., Ltd., viscosity-average molecular weight 18750, terminal hydroxyl group concentration 150 ppm by mass)

[0110] (Chain elongator) • B-1: Product name "Joncryl ADR4468" (manufactured by BASF, "styrene / (meth)acrylate copolymer containing glycidyl groups", weight-average epoxy functional group count 23.4, weight-average molecular weight 7250, epoxy equivalent 310 g / mol) • B-2: Product name "Joncryl ADR4400" (manufactured by BASF, "styrene / (meth)acrylate copolymer containing glycidyl groups", weight-average epoxy functional group count 14.6, weight-average molecular weight 7100, epoxy equivalent 485 g / mol) • B-3: Product name "Modiper A4100" (manufactured by NOF Corporation, "styrene / (meth)acrylate copolymer containing glycidyl groups", weight-average epoxy functional group count 171.4, weight-average molecular weight 240,000, epoxy equivalent 1400 g / mol) • B-4: Product name "Marproof G-01100" (manufactured by NOF Corporation, "styrene / (meth)acrylate copolymer containing glycidyl groups", weight-average epoxy functional group count 70.5, weight-average molecular weight 12000, epoxy equivalent 170 g / mol)

[0111] (Polycarbonate resin for dilution (C)) • C-1: Product name "Novarex 7020IR" (manufactured by Mitsubishi Engineering Plastics, MFR 19.0g / 10min, viscosity average molecular weight 20000, terminal hydroxyl group concentration 600 ppm by mass) • C-2: Product name "Panlight L-1225" (manufactured by Teijin, MFR 9.5g / 10min) • C-3: The above dilution PC resin C-2 was melted and kneaded in a single-screw extruder (manufactured by Nippon Placon Co., Ltd., NS type 40mm vented extruder, L / D=30, screw diameter=40mm, 3-stage barrel, compression ratio 2.0) set to a rotation speed of 60 rpm and a barrel temperature of 280°C. The mixture was then extruded from the nozzle in a string (strand) shape, cooled in a water bath, and cut in a pelletizer to form pellets. This process was repeated once (MFR 10.1g / 10min). • C-4: Product name "INFINO CF-1021T" (manufactured by Lotte Chemical Co., Ltd., MFR 20.7g / 10min) • C-5: Product name "Panlight L-1250WP" (manufactured by Teijin, MFR 7.2g / 10min) • C-6: Product name "Panlight G-3120PH" (manufactured by Teijin, 20% glass fiber by mass, MFR 11.8g / 10min)

[0112] <Masterbatch Preparation> (Example 1-1) 85 parts by mass of PC resin A-1 and 15 parts by mass of chain extender B-1 were mixed using a small high-speed mixer to obtain a mixture. Next, this mixture was melt-kneaded in a twin-screw extruder (L / D=52.5, screw diameter=30mm) set to a rotation speed of 250 rpm and a barrel temperature of 260-290°C, and extruded in a strand shape from a nozzle. After cooling the extruded strand in a water bath, it was cut with a pelletizer to produce a pellet-shaped masterbatch.

[0113] (Examples 1-2 to 6, Comparative Examples 1-1 to 5) A masterbatch was prepared in the same manner as in Example 1-1 described above, except that the types of materials and the amounts used (in units of parts by mass) were as shown in the upper row of Table 1 (Tables 1-1 and 1-2).

[0114] (Processability of masterbatch) The processability of the masterbatch was evaluated according to the evaluation criteria shown below. ○: The masterbatch has been created. ×: The masterbatch could not be created. In Comparative Examples 1-2, the mixture did not solidify, and in Comparative Examples 1-5, the mixture gelled, making it impossible to prepare a masterbatch.

[0115] (MFR measurement) The melt mass flow rate (MFR) of each dilution PC resin (C) described above was measured for the unprocessed resin before melting and kneading. For dilution PC resin C-3, dilution PC resin C-2 was melted and kneaded in a single-screw extruder (Nippon Placon Co., Ltd., NS type 40mm vented extruder, L / D=30, screw diameter=40mm, 3-stage barrel, compression ratio 2.0) set to a rotation speed of 60 rpm and a barrel temperature of 280°C. The resin was extruded in strand form from a nozzle, cooled in a water bath, and then cut into pellets (1-pass product) using a pelletizer. The MFR (g / 10min) was measured using a melt indexer (product name "Melt Indexer G-02", Toyo Seiki Seisakusho Co., Ltd.) in accordance with the test methods specified in JIS K7210-2 and ISO 1133-2, under conditions of a temperature of 280°C and a load of 21.2N.

[0116] Furthermore, the MFR of the resin obtained by melt-kneading dilution PC resin C-1 alone using the same method as when dilution PC resin C-3 was obtained was measured and was 19.3 g / 10 min. Therefore, this MFR value (19.3 g / 10 min) was used as the MFR a The dilution PC resin C-1 is "MFR after melting and kneading by itself." a The material was defined as "polycarbonate resin (C1) with a concentration of 19 g / 10 min or more and 20 g / 10 min or less."

[0117] The masterbatch that was produced and MFR a Using dilution PC resin C-1, which had a concentration of 19.3 g / 10 min, the melt mass flow rate (MFR) of the "resin composition sample" under the aforementioned condition (3) was calculated. bThe melt mass flow rate (MFR) was measured. Specifically, the masterbatch and dilution PC resin C-1 were dry-blended in a ratio that resulted in a chain extender content of 1.0% by mass to obtain a mixture. Next, this mixture was melt-kneaded in a single-screw extruder (Nippon Placon Co., Ltd., NS type 40mm vented extruder, L / D=30, screw diameter=40mm, 3-stage barrel, compression ratio 2.0) set to a rotation speed of 60 rpm and a barrel temperature of 280°C, and extruded in a strand shape from a nozzle. After cooling the extruded strand in a water bath, pelletized resin composition samples were prepared by cutting with a pelletizer. The obtained resin composition samples were then measured for melt mass flow rate (MFR) using the same method as described above. b ) was measured. The lower part of Table 1 shows the MFR. a MFR b , and MFR a -MFR b This shows the value.

[0118] (Measurement of yellowness) The dilution PC resin C-1, which was melt-kneaded alone as described above, was dried at 120°C for 5 hours. Then, a 1 mm thick plate was molded using an injection molding machine (NS-40 type molding machine, manufactured by Nissei Plastic Industrial Co., Ltd., clamping force 40t) under the conditions of cylinder temperature 280°C, injection pressure 96-110 MPa, and mold temperature 100°C. This was used as a test specimen for the resin molded body. The injection pressure was normally set at 96 MPa, and when molding was difficult, the injection pressure was set to normal + 5%, 10%, and 15% (101 MPa, 106 MPa, and 110 MPa). The yellowness (YI value) specified in JIS K7373 was determined for the above test specimen (resin molded body). As a result, the yellowness of dilution PC resin C-1 was 1.59. This yellowness value (1.59) was used as the YI value. a That's what I decided.

[0119] The masterbatch that was created, and YI a Using dilution PC resin C-1, which had a value of 1.59, the yellowness (YI) of the "resin composition sample" under the aforementioned condition (4) was measured. bThe yellowness (YI) was measured. Specifically, the masterbatch and dilution PC resin C-1 were dry-blended in a ratio that resulted in a chain extender content of 1.0% by mass to obtain a mixture. Next, this mixture was melt-kneaded in a single-screw extruder (Nippon Placon Co., Ltd., NS type 40mm vented extruder, L / D=30, screw diameter=40mm, 3-stage barrel, compression ratio 2.0) set to a rotation speed of 60 rpm and a barrel temperature of 280°C, and extruded from the nozzle in a strand shape. After cooling the extruded strand in a water bath, pelletized resin composition samples were prepared by cutting with a pelletizer. Test pieces were formed as resin molded bodies from the obtained resin composition samples by injection molding in the same manner as described above. The yellowness (YI) of these test pieces (resin molded bodies) as specified in JIS K7373 was measured using the method described above. b ) was measured. In the lower row of Table 1, YI a , YI b , and YI a -YI b This shows the value.

[0120] TIFF0007899433000001.tif121170

[0121] TIFF0007899433000002.tif122170

[0122] <Preparation of resin composition> (Example 2-1) 1.33 parts by mass of the masterbatch (MB1) prepared in Example 1-1 and 98.67 parts by mass of diluting PC resin C-1 were dry-blended to obtain a mixture. Next, this mixture was melt-kneaded in a single-screw extruder (NS type 40 mm vented extruder, manufactured by Nippon Placon Co., Ltd., set to a rotation speed of 60 rpm and a barrel temperature of 280°C, with a L / D ratio of 30, screw diameter of 40 mm, 3-stage barrel, and compression ratio of 2.0), and extruded from a nozzle in a strand shape. After cooling the extruded strand in a water bath, the material was cut in a pelletizer to produce a pelletized resin composition.

[0123] <Fabrication of resin molded products> The resin composition prepared in Example 2-1 was dried at 120°C for 5 hours. Then, a 1 mm thick plate was molded using an injection molding machine (NS-40 type molding machine, manufactured by Nissei Plastic Industrial Co., Ltd., with a clamping force of 40 t) under the conditions of cylinder temperature 280°C, injection pressure 96-110 MPa, and mold temperature 100°C. This was used as a test piece for the resin molded body. The injection pressure was normally set at 96 MPa, and when molding was difficult, the injection pressure was set to 5%, 10%, and 15% of the normal condition (101 MPa, 106 MPa, and 110 MPa).

[0124] (Examples 2-2 to 20, Comparative Examples 2-1 to 9) Except for using the types of materials and amounts (unit: parts by mass) shown in the upper row of Table 2 (Tables 2-1 to 2-3), pelletized resin compositions and test pieces (resin molded articles) were prepared in the same manner as in Example 2-1 described above. In Comparative Examples 2-1 and 2-5, the concentration of chain extender (B) was too low, resulting in no increase in viscosity during melting, and the effect of including chain extender (B) was not observed. In Comparative Example 2-2, the concentration of chain extender (B) was too high, causing the reaction to proceed too quickly and reducing transparency. In Comparative Examples 2-3 and 2-4, when test pieces were prepared using an injection molding machine with a mixture of chain extender (B) and diluent PC resin (C), material supply failure occurred due to blocking below the material hopper. In Comparative Examples 2-6 to 2-9, transparency decreased due to the influence of the type of chain extender used in the masterbatch.

[0125] <Measurement and Evaluation Methods> (processability) When producing pelletized resin compositions using the single-screw extruder described above, the processability of the resin compositions was evaluated according to the evaluation criteria shown below by observing the state of the kneaded material extruded in strand form. The evaluation results are shown in the lower section of Table 2. AA: The strands could be processed in 10 minutes without breaking. A: The strand was cut once or twice in 10 minutes, but it was still machinable. B: The strand was cut 3 to 5 times in 10 minutes, but it was still machinable. C: The strand was severed more than 6 times in 10 minutes.

[0126] (Moldability 1) Based on the molding conditions (injection pressure conditions) used to produce resin molded bodies (test specimens consisting of 1 mm thick plates) using the injection molding machine described above, the moldability of the resin composition was evaluated according to the evaluation criteria shown below. The evaluation results are shown in the lower section of Table 2. AA: Molding was possible under injection pressure conditions equivalent to those for molding dilution PC resin (C) alone (the "normal conditions" described above). A: Molding was possible by increasing the injection pressure by 5% from the normal conditions. B: Molding was possible by increasing the injection pressure from the normal conditions by more than 5% to 15% or less. C: Molding was not possible even when the injection pressure was increased to 15% from the normal conditions.

[0127] (Moldability 2) Without preparing a resin composition, a mixture was obtained by dry blending (mixing) a masterbatch or chain extender (B) and a diluent PC resin (C) in the same type and quantity used for preparing the resin composition. A 1 mm thick plate was molded from this mixture using an injection molding machine (NS-40 type molding machine, manufactured by Nissei Plastic Industrial Co., Ltd., clamping force 40t) under the conditions of cylinder temperature 280°C, injection pressure 60 MPa, and mold temperature 100°C. Based on these molding conditions (injection pressure conditions), the moldability of the resin composition was evaluated according to the evaluation criteria shown below. The evaluation results are shown in the lower part of Table 2. AA: Molding was possible under injection pressure conditions equivalent to those for molding dilution PC resin (C) alone (the "normal conditions" described above). A: Molding was possible by increasing the injection pressure by 5% from the normal conditions. B: Molding was possible by increasing the injection pressure from the normal conditions by more than 5% to 15% or less. C: Molding was not possible even when the injection pressure was increased to 15% from the normal conditions, or a material supply failure occurred due to blocking of the material below the hopper.

[0128] (Measurement of MFR of resin composition) For each pelletized resin composition prepared in Examples 2-1 to 20 and Comparative Examples 2-1 to 9, the melt mass flow rate (MFR) of the resin composition was determined by the same method as described above. d The melt mass flow rate (MFR) was measured for the resin obtained by melt-kneading the diluent PC resin (C) used in each resin composition using the same method as when diluent PC resin C-3 was obtained. c ) was measured. The lower part of Table 2 shows the MFR. c MFR d , and MFR c -MFR d This shows the value.

[0129] (transparency) For resin compositions prepared using dilution PC resin (C) with transparency other than dilution PC resin C-6, the haze value specified in JIS K7136 was measured for each test specimen prepared for moldability evaluation 1 using a haze meter (manufactured by Suga Test Instruments Co., Ltd.). Based on the obtained haze values, the transparency of the test specimens was evaluated according to the evaluation criteria shown below. The results are shown in the lower part of Table 2. AA: The haze value was between 0.0% and 1.0%. A: The haze value was between 1.0% and 1.5%. B: The haze value was between 1.5% and 2.0%. C: The haze value was over 2.0%.

[0130] (yellowness) Using a spectrophotometer (product name "CM-3600A", manufactured by Konica Minolta), each test specimen prepared for evaluation of moldability 1 was subjected to transmission measurement under a D65 light source and a 10-degree field of view, and L * a * b * L in color systems * value, a * value, and b * The values ​​were measured. Then, the yellowness (YI value) was calculated in accordance with the provisions of JIS K7373, and the yellowness of the test specimens was evaluated according to the following evaluation criteria. The results are shown in the lower part of Table 2. The AA:YI value was 1 or less. A: The YI value was greater than 1 and less than or equal to 2. B: The YI value was greater than 2 and less than or equal to 3. The C:YI value was greater than 3.

[0131] TIFF0007899433000003.tif176170

[0132] TIFF0007899433000004.tif178170

[0133] TIFF0007899433000005.tif178170

[0134] (Application Example 1: T-die method) Using the same type and quantity of masterbatch and diluting PC resin as in Example 2-4, the mixture was uniformly mixed and then extruded at 280°C using a laboplast mill (manufactured by Toyo Seiki Co., Ltd.) equipped with a T-die to produce a sheet-like evaluation sample with a thickness of approximately 0.5 mm and a width of 100 mm. The produced evaluation sample was pressed to produce a sheet with a thickness of approximately 20 μm. Visual inspection of the produced sheet confirmed that it had good transparency and low yellowness.

[0135] (Application Example 2: Blow Molding Method) Using the same type and quantity of masterbatch and diluting PC resin as in Example 2-4, a cylindrical bottle container with a capacity of 200 mL and a wall thickness of 1 mm was produced using a blow molding machine with a screw diameter of 40 mm heated to 280 °C. Visual inspection of the produced bottle container confirmed that it had good transparency and low yellowness.

[0136] (Application Example 3: Melt Spinning Method) Using the same type and amount of masterbatch and diluting PC resin as in Example 2-6, the mixture was uniformly mixed and then extruded from the spinning pack using a φ30 mm melt spinning machine. Undrawn yarn was obtained by drawing at a draw speed of 2,500 m / min. Subsequently, this undrawn yarn was heat-stretched four times to obtain fibers. There was no breakage of yarn during spinning, and visual inspection of a bundle of 50 fibers confirmed that yarn with low yellowness was obtained.

Claims

1. A masterbatch for polycarbonate resin (C), A polycarbonate resin (A) having a terminal hydroxyl group concentration of 400 ppm by mass or less, It contains a chain extender (B) having a weight-average epoxy functional group count of 3 or more and 65 or less, and a weight-average molecular weight of 2000 or more and 30000 or less, A masterbatch that satisfies the following conditions (1) and (2). Condition (1): The content of the chain extender (B) in the masterbatch is 0.10% by mass or more and 25% by mass or less, based on the total mass of the masterbatch. Condition (2): The masterbatch is used by mixing it with the polycarbonate resin (C) under the condition that the content of the chain extender (B) in the resin composition containing the masterbatch and the polycarbonate resin (C) in which the masterbatch is used is 0.05% by mass or more and 2.5% by mass or less.

2. The masterbatch according to claim 1, wherein the epoxy equivalent of the chain extender (B) is 100 g / mol or more and 1000 g / mol or less.

3. The content of the chain extender (B) in the masterbatch in the above condition (1) is 2.0% by mass or more and 25% by mass or less, based on the total mass of the masterbatch, Melt mass flow rate (MFR) after melting and kneading alone ａ The melt mass flow rate of a resin composition sample obtained by melt-kneading a polycarbonate resin (C1) having a content of 19 g / 10 min to 20 g / 10 min and the masterbatch in a ratio such that the content of the chain extender (B) is 1.0% by mass is measured as MFR. ｂ When (g / 10min), 0 < MFR ａ - MFR ｂ The masterbatch according to claim 1, wherein the value is 15.

4. The yellowness of the polycarbonate resin (C1) after melt-kneading by itself is defined as YI as specified in JIS K7373. ａ The degree of yellowness of the resin composition sample as defined in JIS K7373 is YI ｂ When this is the case, 0 < YI ａ -YI ｂ The masterbatch according to claim 3, wherein the value is 1.

5. A resin composition comprising a masterbatch according to any one of claims 1 to 4 and a polycarbonate resin (C).

6. The resin composition according to claim 5, wherein the melt mass flow rate (MFR) of the polycarbonate resin (C) is 0.5 g / 10 min or more and 80 g / 10 min or less.

7. The melt mass flow rate of the polycarbonate resin (C) after melt-kneading alone is MFR ｃ (g / 10 min), and when the melt mass flow rate of the resin composition is MFR ｄ (g / 10 min), 0 < MFR ｃ - MFR ｄ < 40, and the resin composition according to claim 5.

8. The resin composition according to claim 5, wherein the polycarbonate resin (C) comprises recycled polycarbonate resin.

9. Furthermore, the resin composition according to claim 5, further containing at least one fiber selected from glass fibers and carbon fibers.

10. Furthermore, the resin composition according to claim 5 contains at least one resin selected from the group consisting of ABS resin, acrylic resin, polyethylene terephthalate resin, and polybutylene terephthalate resin.

11. The resin composition according to claim 5, wherein the melt mass flow rate (MFR) is 0.5 g / 10 min or more and 80 g / 10 min or less.

12. The melt mass flow rate (MFR) of the resin composition is 20 g / 10 min or more and 80 g / 10 min or less. The resin composition according to claim 5, for use in optical discs, precision components, or medical devices.

13. The melt mass flow rate (MFR) of the resin composition is 2 g / 10 min or more and less than 20 g / 10 min. The resin composition according to claim 5, for use in automobile parts, helmets, or building materials.

14. The melt mass flow rate (MFR) of the resin composition is 0.5 g / 10 min or more and less than 2 g / 10 min. The resin composition according to claim 5, for use as a bulletproof material.

15. A resin molded article which is a molded product of the resin composition described in claim 5.

16. The resin molded article according to claim 15, wherein the haze value specified in JIS K7136 is 0.0% or more and 2.0% or less.

17. A resin molded article according to claim 15, wherein the degree of yellowness (YI value) as defined in JIS K7373 is 3 or less.

18. The resin molded article according to claim 15, which is a building material, civil engineering material, automobile part, transportation equipment part, electrical and electronic equipment part, medical equipment part, daily necessities, general merchandise, bulletproof material, sign material, or optical component.

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