JP6216104B1 - Polycarbonate resin composition, molded article and carrier tape - Google Patents

Abstract

A polycarbonate resin, a polyalkylene terephthalate resin, a carbon material, and a graft copolymer, wherein the graft copolymer includes a core portion and a covering portion that covers at least a part of the core portion. The carbon material content is 10 to 45 parts by mass with respect to a total of 100 parts by mass of the polycarbonate resin and the polyalkylene terephthalate resin, and the graft copolymer comprises the polycarbonate resin and The polycarbonate resin composition which is 0.5-35 mass parts with respect to a total of 100 mass parts of the said polyalkylene terephthalate resin.

Description

  The present invention relates to a polycarbonate resin composition, a molded body, and a carrier tape.

  When dust or dirt adheres to electronic components such as integrated circuit chips (IC chips), troubles such as malfunctions are caused. Therefore, when handling electronic components, synthetic resin carrier tapes are used as containers for transporting or storing electronic components, in which recesses called pockets are arranged on a long sheet of any width at regular intervals. Sometimes.

  In this case, the electronic component is accommodated in the pocket portion. And a carrier tape body is obtained by being covered with the film called a cover tape. The carrier tape body is transported and stored in a state of being wound around a reel. The electronic component is used after being taken out of the pocket portion after the cover tape is peeled off from the carrier tape body. An electronic component may be automatically taken out using a mounting machine. Patent Document 1 below discloses a carrier tape that prevents electronic components from jumping out of a pocket due to vibration of a mounting machine.

  Polycarbonate resin is an engineering plastic having excellent heat resistance, impact resistance and dimensional stability, and is widely used in various fields, and has attracted attention as a material suitable for use as a carrier tape. However, the molded article of the polycarbonate resin is liable to adhere to dust, and this improvement is required. On the other hand, conventionally, a polycarbonate resin and a conductive filler (carbon black, carbon fiber, carbon nanotube, etc.) are contained in order to impart an antistatic property or conductivity to a polycarbonate resin composition containing a polycarbonate resin. A composition is used (see, for example, Patent Document 2 below).

  If a large amount of conductive filler (carbon black or the like) is used to impart conductivity to the resin composition, the processability of the resin composition may be significantly reduced during melt-kneading or molding. In addition, there is a problem that the surface appearance of the molded body deteriorates due to carbon aggregation. In order to solve this problem, a technique of blending a thermoplastic polyalkylene terephthalate resin or the like is used (for example, see Patent Document 3 below).

JP 2000-103396 A JP-A-10-92225 JP 62-297353 A

  The polycarbonate resin composition is used as a container for which antistatic properties and antistatic properties are required, such as a container for transporting or storing electronic components (such as IC chips) (for example, a carrier tape for electronic components (such as IC chips)). Is used. In particular, in the use of carrier tapes for electronic components (IC chips, etc.), in recent years, from the viewpoint of improving productivity and from the viewpoint of reducing environmental impact (reducing waste discharge, etc.) A certain amount of milling material generated in the process is once recovered and then pulverized, and then the pulverized product is returned to the extruder, melted and kneaded, and then re-molded. In that case, the problem that the electroconductivity of a molded object falls remarkably by factors, such as thermal deterioration of resin by repeated melt-kneading, and aggregation of an electroconductive filler, may arise.

  An object of the present invention is to provide a polycarbonate resin composition capable of suppressing a decrease in conductivity even when repeatedly molded. Moreover, the objective of this invention is providing the molded object containing the said resin composition. Furthermore, the objective of this invention is providing the carrier tape containing the said resin composition.

  The present inventor is effective in suppressing a decrease in conductivity when a graft copolymer having a structure including a core part and a covering part covering at least a part of the core part is repeatedly molded. And the resin composition is repeatedly molded by using a resin composition containing a polycarbonate resin, a polyalkylene terephthalate resin, a carbon material, and the graft copolymer. It was also found that the decrease in conductivity can be suppressed.

  A polycarbonate resin composition according to the present invention contains a polycarbonate resin, a polyalkylene terephthalate resin, a carbon material, and a graft copolymer, and the graft copolymer includes a core portion and at least the core portion. A covering portion that covers a part thereof, and the content of the carbon material is 10 to 45 parts by weight with respect to a total of 100 parts by weight of the polycarbonate resin and the polyalkylene terephthalate resin, A graft copolymer is 0.5-35 mass parts with respect to a total of 100 mass parts of the said polycarbonate resin and the said polyalkylene terephthalate resin.

  According to the polycarbonate resin composition of the present invention, it is possible to suppress a decrease in conductivity even when it is repeatedly molded. For example, according to the polycarbonate resin composition according to the present invention, the decrease in conductivity can be suppressed to a very low level even if it is repeatedly formed by melt extrusion for the purpose of recycling or the like. Furthermore, according to the polycarbonate resin composition according to the present invention, it is possible to suppress a decrease in conductivity even when repeatedly molded while achieving an excellent appearance of the molded body.

  The polycarbonate resin composition according to the present invention is the graft copolymer, wherein the core portion includes a polymer having a structural unit derived from a monomer having an acryloyl group, and the covering portion is an unsaturated carboxylic acid. An embodiment including a polymer having a structural unit derived from an ester is preferred. In this case, the effect which suppresses the electroconductive fall at the time of recycling is further excellent.

  The molded body according to the present invention includes the polycarbonate resin composition. According to the molded body according to the present invention, even when the molded body is obtained by repeatedly molding the resin composition, the decrease in conductivity can be suppressed. Furthermore, according to the molded body according to the present invention, it is possible to suppress a decrease in conductivity even when the molded body is obtained by repeatedly molding the resin composition while achieving an excellent appearance of the molded body. .

  Moreover, this inventor discovered applying the said resin composition which can suppress the electroconductive fall even if it is a case where it shape | molds repeatedly to a carrier tape. The carrier tape according to the present invention includes the polycarbonate resin composition. According to the carrier tape according to the present invention, even when the resin composition is repeatedly molded to obtain a molded body, a decrease in conductivity can be suppressed. Furthermore, according to the carrier tape according to the present invention, it is possible to suppress a decrease in conductivity even when a molded body is obtained by repeatedly molding a resin composition while achieving an excellent appearance of the molded body. .

  According to the present invention, it is possible to suppress a decrease in conductivity even when repeatedly molded. Furthermore, according to the present invention, it is possible to suppress a decrease in conductivity even when repeatedly molded while achieving an excellent appearance of the molded body. Therefore, the practical utility value of the present invention is extremely high. ADVANTAGE OF THE INVENTION According to this invention, the application to the conveyance or storage of an electronic component of the molded object containing a polycarbonate resin composition can be provided. ADVANTAGE OF THE INVENTION According to this invention, the application to conveyance or storage of an electronic component of the carrier tape containing a polycarbonate resin composition can be provided.

  Hereinafter, embodiments for carrying out the present invention will be described in detail. However, the present invention is not limited to the following embodiments. In addition, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and redundant descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art. In addition, this inventor provides the following description in order for those skilled in the art to fully understand this invention, and is not intending limiting the theme as described in a claim by these.

  In this specification, “carrier tape” refers to an object such as an electronic component (eg, memory microchip, IC chip, resistor, connector, processor, capacitor, gate array, transistor, diode, relay, and LED). Examples include carrier tapes used for transporting or storing (components; transport objects, storage objects, etc.). The carrier tape is, for example, a packaging material (target object) in which a concave part (a concave part called a pocket part) for accommodating a target object (electronic component or the like) is arranged on a sheet having an arbitrary width at regular intervals. It can be used as a packaging material for (electronic parts, etc.). After the object (electronic parts, etc.) is stored in the recess, an adhesive or heat-sealable film called a cover tape is continuously adhered to the top of the carrier tape in the direction in which the pockets are continuously provided. Alternatively, the lid may be formed by bonding and covering the opening surface of the pocket portion.

  In this specification, “(meth) acryl” means at least one of acrylic and methacryl corresponding thereto. The same applies to other similar expressions such as “(meth) acryloyl”. In the present specification, the content of each component in the composition is the total amount of the plurality of substances present in the composition unless there is a specific notice when there are a plurality of substances corresponding to each component in the composition. means. The material illustrated below may be used individually by 1 type, and may use 2 or more types together.

  The polycarbonate resin composition according to this embodiment contains a polycarbonate resin, a polyalkylene terephthalate resin, a carbon material, and a graft copolymer. The graft copolymer has a structure including a core portion and a covering portion that covers at least a part of the core portion. Content of the said carbon material is 10-45 mass parts with respect to a total of 100 mass parts of the said polycarbonate resin and the said polyalkylene terephthalate resin. The said graft copolymer is 0.5-35 mass parts with respect to a total of 100 mass parts of the said polycarbonate resin and the said polyalkylene terephthalate resin. The polycarbonate resin composition according to the present embodiment can be used as a conductive polycarbonate resin composition.

  According to the polycarbonate resin composition according to this embodiment, it is possible to suppress a decrease in conductivity even when it is repeatedly molded. About the factor from which such an effect is acquired, this inventor estimates as follows. That is, in the case of using a graft copolymer having a structure including a core part and a covering part, and a carbon material, the carbon material is likely to be present on the surface of the graft copolymer, and the carbon materials are likely to come into contact with each other. Guessed. And in the resin composition containing the polycarbonate resin and the polyalkylene terephthalate resin, the surface of the graft copolymer is obtained by using a predetermined amount of the graft copolymer having a structure having a core part and a covering part, and a carbon material. It is presumed that a conductive path is easily formed when the carbon materials come into contact with each other. In addition, since the graft copolymer has a structure having a covering portion, the graft copolymer is prevented from aggregating with each other in the resin composition containing the polycarbonate resin and the polyalkylene terephthalate resin. Therefore, it is assumed that the conductive path is easily maintained. Accordingly, it is presumed that the decrease in conductivity is suppressed even when the resin composition is repeatedly molded.

<Polycarbonate resin composition>
((A) component: polycarbonate resin)
The polycarbonate resin as the component (A) can be obtained, for example, by a phosgene method in which various dihydroxydiaryl compounds and phosgene are reacted, or a transesterification method in which a dihydroxydiaryl compound and a carbonate (such as diphenyl carbonate) are reacted. And polymers that can be used. In producing the component (A), a molecular weight regulator, a catalyst, and the like can be used as necessary.

  Dihydroxydiaryl compounds include bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxyphenyl) propane (also known as bisphenol A), 2,2 -Bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) octane, bis (4-hydroxyphenyl) phenylmethane, 2,2-bis (4-hydroxyphenyl-3-methylphenyl) propane 1,1-bis (4-hydroxy-3-tert-butylphenyl) propane, 2,2-bis (4-hydroxy-3-bromophenyl) propane, 2,2-bis (4-hydroxy-3,5) -Dibromophenyl) propane, bis such as 2,2-bis (4-hydroxy-3,5-dichlorophenyl) propane Hydroxyaryl) alkanes; bis (hydroxyaryl) cycloalkanes such as 1,1-bis (4-hydroxyphenyl) cyclopentane and 1,1-bis (4-hydroxyphenyl) cyclohexane; 4,4′-dihydroxydiphenyl ether Dihydroxy diaryl ethers such as 4,4′-dihydroxy-3,3′-dimethyldiphenyl ether; dihydroxy diaryl sulfides such as 4,4′-dihydroxydiphenyl sulfide; 4,4′-dihydroxydiphenyl sulfoxide, 4,4 ′ -Dihydroxydiaryl sulfoxides such as dihydroxy-3,3'-dimethyldiphenyl sulfoxide; 4,4'-dihydroxydiphenyl sulfone, 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfone, etc. Such as dihydroxy diaryl sulfones, and the like. A dihydroxy diaryl compound may be used individually by 1 type, and may use 2 or more types together.

  A dihydroxydiaryl compound may be used in combination with piperazine, dipiperidylhydroquinone, resorcin, 4,4'-dihydroxydiphenyl, and the like.

  A dihydroxydiaryl compound and a trivalent or higher valent phenol compound may be used in combination. Examples of the trivalent or higher valent phenol compound include phloroglucin, 4,6-dimethyl-2,4,6-tris (4-hydroxyphenyl) heptene, 2,4,6-trimethyl-2,4,6-tris (4- Hydroxyphenyl) heptane, 1,3,5-tris (4-hydroxyphenyl) benzene, 1,1,1-tris (4-hydroxyphenyl) ethane, 2,2-bis [4,4- (4,4 ' -Dihydroxydiphenyl) cyclohexyl] propane and the like.

  The viscosity average molecular weight of the component (A) is preferably 10,000 or more, more preferably 15,000 or more, still more preferably 17000 or more, and particularly preferably 20000 or more from the viewpoint of easily obtaining excellent moldability. The viscosity average molecular weight of the component (A) is preferably 100000 or less, more preferably 35000 or less, further preferably 28000 or less, and more preferably 25000 or less from the viewpoint of easily obtaining an excellent appearance of the surface of the molded body (sheet or the like). Particularly preferred. From these viewpoints, the viscosity average molecular weight of the component (A) is preferably 10000 to 100,000, more preferably 15000 to 35000, further preferably 17000 to 28000, and particularly preferably 20000 to 25000.

The viscosity average molecular weight of the component (A) can be obtained by the following procedure. First, a 0.5 mass% polycarbonate resin solution is obtained using methylene chloride as a solvent. Next, the specific viscosity (η _sp ) is measured at a temperature of 20 ° C. using a Cannon Fenceke type viscosity tube. Then, the intrinsic viscosity [η] is obtained by concentration conversion, and the viscosity average molecular weight M can be calculated from the following SCHNELL formula.
[Η] = 1.23 × 10 ⁻⁴ M ^0.83

  The content of the component (A) is preferably in the following range based on the total amount of the component (A) and the component (B). The content of the component (A) is preferably 90% by mass or more, more preferably 93% by mass or more, still more preferably 95% by mass or more, and particularly preferably 97% by mass or more from the viewpoint of easily obtaining excellent moldability. preferable. The content of the component (A) is preferably 99.94% by mass or less, more preferably 99.9% by mass or less, from the viewpoint of easily obtaining an excellent appearance of the surface of the molded body (sheet or the like). 5 mass% or less is still more preferable, and 99 mass% or less is especially preferable. From these viewpoints, the content of the component (A) is preferably 90 to 99.94% by mass, more preferably 93 to 99.9% by mass, still more preferably 95 to 99.5% by mass, and 97 to 99% by mass. % Is particularly preferred.

((B) component: polyalkylene terephthalate resin)
Examples of the polyalkylene terephthalate resin as component (B) include polyethylene terephthalate resin, polypropylene terephthalate resin, and polybutylene terephthalate resin.

  The intrinsic viscosity of the component (B) measured based on JIS K7233 is preferably in the following range. The intrinsic viscosity is preferably 0.6 or more, more preferably 0.7 or more, still more preferably 0.9 or more, from the viewpoint of easily obtaining excellent conductivity (low resistance value; the same applies hereinafter). 0 or more is particularly preferable. The intrinsic viscosity is preferably 1.5 or less, more preferably 1.4 or less, and more preferably 1.2 or less from the viewpoint of improving the dispersibility of the component (B) with respect to other resin components (component (A) and the like). Further preferred. From these viewpoints, the intrinsic viscosity is preferably 0.6 to 1.5, more preferably 0.7 to 1.4, still more preferably 0.9 to 1.2, and 1.0 to 1.2. Particularly preferred.

  The content of component (B) is preferably in the following range based on the total amount of component (A) and component (B). The content of the component (B) is preferably 0.06% by mass or more, more preferably 0.5% by mass or more, still more preferably 1.0% by mass or more, from the viewpoint of easily obtaining excellent conductivity. 1.5 mass% or more is especially preferable, and 2.0 mass% or more is very preferable. The content of the component (B) is preferably 10% by mass or less, more preferably 5.0% by mass or less, and still more preferably 3.0% by mass or less from the viewpoint that an excellent appearance of the molded body can be easily obtained. From these viewpoints, the content of the component (B) is preferably 0.06 to 10% by mass, more preferably 0.5 to 5.0% by mass, still more preferably 1.0 to 3.0% by mass, 1.5-3.0 mass% is especially preferable, and 2.0-3.0 mass% is very preferable.

((C) component: carbon material)
Examples of the carbon material as component (C) include carbon black, graphite, carbon fiber, carbon nanotube, carbon nanocoil, and carbon nanosphere.

  Examples of the carbon black classification include furnace type, acetylene type, and ketjen type. Among these, furnace-type carbon black is preferable from the viewpoint of easily obtaining excellent recyclability.

The specific surface area of carbon black is preferably 30 m ² / g or more, more preferably 40 m ² / g or more, and still more preferably 50 m ² / g or more, from the viewpoint that excellent conductivity can be easily obtained. The specific surface area of the carbon black, good dispersibility can be easily obtained carbon black, from the viewpoint of excellent appearance can be easily obtained on the surface of the molded product (sheet) is preferably not more than 90m ² / ^g, 75m 2 / G or less is more preferable, and 60 m ² / g or less is still more preferable. From these viewpoints, the specific surface area of the carbon black is preferably 30~90m ² / g, more preferably 40~75m ² / g, more preferably 50 to 60 m ² / g. The specific surface area of the carbon black may be 50 to 90 m ² / g.

The specific surface area can be measured in accordance with a test method for basic performance of carbon black for JIS K6217 rubber. The specific surface area is indicated by the surface area (m ² ) per unit mass (g) of carbon black. The specific surface area can be obtained by immersing degassed carbon black in liquid nitrogen and measuring the amount of nitrogen adsorbed on the surface of the carbon black at equilibrium.

  The DBP oil absorption amount of the carbon black is preferably 100 ml / 100 g or more, more preferably 130 ml / 100 g or more, further preferably 150 ml / 100 g or more, and more than 150 ml / 100 g from the viewpoint of easily obtaining excellent conductivity. Particularly preferably, 160 ml / 100 g or more is very preferable, and 170 ml / 100 g or more is very preferable. The DBP oil absorption amount of the carbon black is preferably 300 ml / 100 g or less, from the viewpoint that the excellent dispersibility of the carbon black can be easily obtained and the excellent appearance of the surface of the molded body (sheet or the like) can be easily obtained. 100 g or less is more preferable, and 200 ml / 100 g or less is still more preferable. From these viewpoints, the DBP oil absorption of carbon black is preferably 100 to 300 ml / 100 g, more preferably 130 to 300 ml / 100 g, further preferably 150 to 300 ml / 100 g, more than 150 ml / 100 g and 300 ml / 100 g or less. Particularly preferred is 160 to 220 ml / 100 g, very preferred is 170 to 200 ml / 100 g.

  DBP (n-dibutyl phthalate, Di-butyl phthalate) oil absorption can be measured in accordance with the basic performance test method of carbon black for JIS K6217 rubber. The DBP oil absorption is correlated with the bonding force between the carbon black particles, and a large DBP oil absorption means that the structure is long.

From the viewpoint that excellent conductivity can be easily obtained, and from the viewpoint that the excellent dispersibility of carbon black can be easily obtained, and the excellent appearance of the surface of the molded body (sheet, etc.) can be easily obtained. It is preferable that both the specific surface area and the DBP oil absorption amount satisfy the preferable range. For example, an embodiment in which the specific surface area is 30 to 90 m ² / g and the DBP oil absorption is 100 to 300 ml / 100 g is preferable.

  (C) Content of a component is 10-45 mass parts with respect to a total of 100 mass parts of (A) component and (B) component. When the content of the component (C) is less than 10 parts by mass, sufficient conductivity cannot be obtained in the molded body. When content of (C) component exceeds 45 mass parts, a viscosity will increase and shaping | molding stability will fall. The content of the component (C) is preferably 13 parts by mass or more and 15 parts by mass or more with respect to a total of 100 parts by mass of the component (A) and the component (B) from the viewpoint of easily obtaining excellent conductivity. Is more preferable, 17 parts by mass or more is further preferable, 20 parts by mass or more is particularly preferable, and 21 parts by mass or more is extremely preferable. The content of the component (C) is preferably 40 parts by mass or less, and preferably 30 parts by mass or less with respect to a total of 100 parts by mass of the component (A) and the component (B), from the viewpoint that molding stability is easily improved. More preferred is 27 parts by mass or less, and particularly preferred is 25 parts by mass or less. From these viewpoints, the content of the component (C) is preferably 10 to 40 parts by mass, more preferably 13 to 30 parts by mass with respect to 100 parts by mass in total of the component (A) and the component (B). -27 parts by mass is further preferred, 15-25 parts by mass is particularly preferred, 17-25 parts by mass is extremely preferred, 20-25 parts by mass is very preferred, and 21-25 parts by mass is even more preferred.

((D) component: graft copolymer)
The graft copolymer which is (D) component has a structure provided with a core part (core material) and the coating | coated part which coat | covers at least one part of the said core part. The component (D) may have a core-shell type structure including, for example, a core layer (core portion) and a shell layer (covering portion) that covers the core layer. A core part and a coating | coated part can be comprised from a mutually different polymer. Each of the core part and the covering part may have a plurality of layers. The covering portion may cover a part of the core portion or may cover the entire core portion. (D) A component can be obtained by making the structural component of a coating | coated part react in presence of the structural component of a core part, and graft-polymerizing the structural component of a coating | coated part to the structural component of a core part.

  The core is selected from the group consisting of acrylic rubber (polymer having a structural unit derived from a monomer having an acryloyl group) and silicone rubber from the viewpoint of further suppressing the decrease in conductivity during recycling. It is preferable to include at least one type, and it is more preferable to include acrylic rubber. The constituent component of the core is not limited to acrylic rubber and silicone rubber, and polybutadiene or the like may be used.

  As the acrylic rubber, a polymer having a structural unit derived from a monomer having an acryloyl group as a main structural unit can be used. The content of the structural unit derived from the monomer having an acryloyl group is preferably 50 to 100% by mass, based on the total mass of the acrylic rubber, from the viewpoint that excellent recyclability can be easily obtained, and 70 to 100%. The mass% is more preferable.

  As the monomer having an acryloyl group, an acrylate ester can be used. Examples of the acrylate ester include an alkyl acrylate ester having 2 to 8 carbon atoms in the alkyl group, and examples thereof include ethyl acrylate, n-butyl acrylate, and 2-ethylhexyl acrylate.

  The acrylic rubber may have a structural unit derived from other components other than the acrylate ester. As such a component, a vinyl monomer copolymerizable with an acrylate ester is preferable from the viewpoint of easily obtaining a copolymer at low cost.

  Examples of vinyl monomers copolymerizable with acrylic acid esters include aromatic vinyl compounds such as styrene and α-methylstyrene; alkyl methacrylates such as methyl methacrylate and ethyl methacrylate; unsaturated compounds such as acrylonitrile and methacrylonitrile. Nitriles; vinyl ethers such as methyl vinyl ether and butyl vinyl ether; vinyl halides such as vinyl chloride and vinyl bromide; vinylidene halides such as vinylidene chloride and vinylidene bromide; glycidyl acrylate, glycidyl methacrylate, allyl glycidyl ether, ethylene glycol glycidyl ether, etc. And vinyl monomers having a glycidyl group.

  Examples of acrylic rubber include silicone / acrylic rubber (a composite polymer having a structural unit derived from a monomer having an acryloyl group (acrylic component) and a structural unit derived from a silicone component. For example, derived from an alkyl acrylate. And a polymer having a structural unit and a polyorganosiloxane skeleton).

  As the silicone rubber, polyorganosiloxane can be used. For example, polyorganosiloxane which is a linear polymer having an organosiloxane bond unit of several thousand or more can be used. The silicone rubber may be produced by any method, but a rubber obtained by an emulsion polymerization method is preferable.

  Although there is no restriction | limiting in particular as polyorganosiloxane, Polyorganosiloxane which has a vinyl polymerizable functional group is preferable. The polyorganosiloxane can be obtained using dimethylsiloxane. Dimethylsiloxane may be chain-like or cyclic. Examples of dimethylsiloxane include dimethylsiloxane-based cyclic bodies having 3 or more membered rings, and 3- to 7-membered dimethylsiloxane-based cyclic bodies are preferable. Specific examples include hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane. Dimethylsiloxane may be used alone or in combination of two or more.

  The coating part constituting the component (D) has a structure derived from an unsaturated carboxylic acid ester from the viewpoint of improving the dispersibility of the component (D) relative to other resin components (component (A), component (B), etc.). Units, structural units derived from vinyl compounds (excluding unsaturated carboxylic esters), structural units derived from maleimide compounds, structural units derived from unsaturated dicarboxylic acids, and structural units derived from unsaturated dicarboxylic anhydrides It is preferable to include a polymer having at least one selected from the group consisting of:

  Examples of the vinyl compound include glycidyl group-containing vinyl compounds, aliphatic vinyl compounds, aromatic vinyl compounds, and vinyl cyanide compounds. A compound that corresponds to a glycidyl group-containing vinyl compound and that corresponds to an aliphatic vinyl compound, an aromatic vinyl compound, or a vinyl cyanide compound belongs to the glycidyl group-containing vinyl compound.

  From the viewpoint of improving the dispersibility of component (D) relative to other resin components (component (A), component (B), etc.), structural units derived from unsaturated carboxylic acid esters, structures derived from glycidyl group-containing vinyl compounds A polymer having at least one selected from the group consisting of a unit and a structural unit derived from an unsaturated dicarboxylic acid anhydride is preferred, and a polymer having a structural unit derived from an unsaturated carboxylic acid ester is more preferred. The compound which gives the structural unit of the polymer which comprises a coating | coated part may be used individually by 1 type, and may use 2 or more types together.

  Examples of the unsaturated carboxylic acid ester include an unsaturated carboxylic acid alkyl ester and an unsaturated carboxylic acid aryl ester. As the unsaturated carboxylic acid ester, a (meth) acrylic acid ester can be used. Examples of (meth) acrylic acid esters include (meth) acrylic acid alkyl esters and (meth) acrylic acid aryl esters.

  As the unsaturated carboxylic acid alkyl ester, a (meth) acrylic acid alkyl ester is preferable from the viewpoint of improving the dispersibility of the (D) component with respect to other resin components ((A) component, (B) component, etc.). Examples of (meth) acrylic acid alkyl esters include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate, and t-butyl (meth) acrylate. , N-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, cyclohexyl (meth) acrylate, stearyl (meth) acrylate, octadecyl (meth) acrylate, benzyl (meth) acrylate, (meth) Chloromethyl acrylate, 2-chloroethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2,3,4,5,6-penta (meth) acrylate Hydroxyhexyl, (meth) acrylic acid 2,3,4,5-tetrahydroxypentyl, (meth) a Aminoethyl laurate, (propylamino) ethyl (meth) acrylate, (dimethylamino) ethyl (meth) acrylate, (ethylamino) propyl (meth) acrylate, (phenylamino) ethyl (meth) acrylate, ( (Meth) acrylic acid (cyclohexylamino) ethyl and the like. As the (meth) acrylic acid alkyl ester, from the viewpoint that the effect of improving the dispersibility of the (D) component with respect to other resin components ((A) component, (B) component, etc.) is large, methyl (meth) acrylate and At least one selected from the group consisting of n-butyl (meth) acrylate is preferred.

  The unsaturated carboxylic acid aryl ester is preferably a (meth) acrylic acid aryl ester from the viewpoint of improving the dispersibility of the component (D) with respect to other resin components (component (A), component (B), etc.). Examples of the (meth) acrylic acid aryl ester include phenyl (meth) acrylate, dimethylphenyl (meth) acrylate, and naphthyl (meth) acrylate.

  Examples of the glycidyl group-containing vinyl compound include glycidyl (meth) acrylate, glycidyl itaconate, diglycidyl itaconate, allyl glycidyl ether, styrene-4-glycidyl ether, 4-glycidyl styrene, and the like. As the glycidyl group-containing vinyl compound, glycidyl (meth) acrylate is preferable from the viewpoint of a large effect of improving impact resistance. A glycidyl group containing vinyl compound may be used individually by 1 type, and may use 2 or more types together.

  Examples of the aliphatic vinyl compound include ethylene, propylene, butadiene and the like. Examples of the aromatic vinyl compound include styrene, α-methylstyrene, p-aminostyrene, 1-vinylnaphthalene, 4-methylstyrene, 4-propylstyrene, 4-cyclohexylstyrene, 4-dodecylstyrene, 2-ethyl-4- Examples include benzylstyrene, 4- (phenylbutyl) styrene, halogenated styrene, 2-styryl-oxazoline and the like. Examples of the vinyl cyanide compound include acrylonitrile, methacrylonitrile, ethacrylonitrile and the like.

  Other vinyl compounds include acrylamide, methacrylamide, N-methylacrylamide, butoxymethylacrylamide, N-propylmethacrylamide, N-vinyldiethylamine, N-acetylvinylamine, allylamine, methallylamine, N-methylallylamine, 2-iso Examples include propenyl-oxazoline and 2-vinyl-oxazoline.

  The maleimide compounds include maleimide, N-methylmaleimide, N-ethylmaleimide, N-propylmaleimide, N-isopropylmaleimide, N-cyclohexylmaleimide, N-phenylmaleimide, N- (p-bromophenyl) maleimide, N- ( Chlorophenyl) maleimide and the like. Examples of the unsaturated dicarboxylic acid include maleic acid, itaconic acid, and phthalic acid.

As a combination of the constituent components of the core part and the covering part, an acrylic rubber (a polymer having a structural unit derived from a monomer having an acryloyl group) from the viewpoint of further improving the effect of suppressing a decrease in conductivity during recycling. ) And a covering portion containing a polymer having at least one selected from the group consisting of a structural unit derived from an unsaturated carboxylic acid ester and a structural unit derived from a vinyl compound. A graft copolymer is preferable, at least one selected from the group consisting of the following (DI) component and the following (D-II) component is more preferable, and the (D-II) component is more preferable.
(DI) component: a polymer having at least one selected from the group consisting of a core containing silicone / acrylic rubber, a structural unit derived from an unsaturated carboxylic acid ester, and a structural unit derived from a vinyl compound A graft copolymer having a core-shell structure.
(D-II) Component: A graft copolymer having a core-shell structure comprising a core containing acrylic rubber and a coating containing a polymer having a structural unit derived from an unsaturated carboxylic ester.

  As the component (D-I), a group consisting of a structural unit derived from an unsaturated carboxylic acid alkyl ester and a structural unit derived from a vinyl compound from the viewpoint of further improving the effect of suppressing a decrease in conductivity during recycling. It is preferable to include a coating portion containing a polymer having at least one selected from at least one selected from the group consisting of a structural unit derived from methyl (meth) acrylate and a structural unit derived from a glycidyl group-containing vinyl compound. It is more preferable to provide a covering portion including a polymer having one kind. Examples of commercially available (D-I) components include Methrene S-2001, Methbrene S-2006, Methbrene S-2200 manufactured by Mitsubishi Rayon Co., Ltd., and the like.

  As the component (D-II), it is preferable to include a covering portion containing a polymer having a structural unit derived from an unsaturated carboxylic acid alkyl ester, from the viewpoint of further improving the effect of suppressing the decrease in conductivity during recycling. It is more preferable to provide a coating portion containing a polymer having a structural unit derived from methyl (meth) acrylate. Examples of commercially available (D-II) components include Paraloid BPM-500 and Paraloid BPM-515 manufactured by Rohm & Haas Japan, Inc .; Metabrene W-450A and Metabrene W-600A manufactured by Mitsubishi Rayon Co., Ltd. .

  (D) Content of a component is 0.5-35 mass parts with respect to a total of 100 mass parts of (A) component and (B) component. When the content of the component (D) is less than 0.5 parts by mass, sufficient recyclability cannot be obtained. The content of the component (D) is preferably 1 part by mass or more with respect to a total of 100 parts by mass of the component (A) and the component (B), from the viewpoint of further improving the effect of suppressing the decrease in conductivity during recycling. 2 parts by mass or more is more preferable, 5 parts by mass or more is further preferable, 7 parts by mass or more is particularly preferable, 8 parts by mass or more is extremely preferable, and 10 parts by mass or more is very preferable. When the content of the component (D) exceeds 35 parts by mass, sufficient recyclability cannot be obtained and the appearance of the molded article is deteriorated. The content of the component (D) is such that the effect of suppressing the decrease in conductivity during recycling is further excellent, and from the viewpoint of obtaining a more excellent appearance of the molded body, the components (A) and (B) 30 mass parts or less are preferable with respect to a total of 100 mass parts, 20 mass parts or less are more preferable, 18 mass parts or less are still more preferable, 15 mass parts or less are especially preferable, and 12 mass parts or less are very preferable. From these viewpoints, the content of the component (D) is preferably 0.5 to 30 parts by mass and more preferably 1 to 20 parts by mass with respect to 100 parts by mass in total of the component (A) and the component (B). 2 to 20 parts by mass is more preferable, 5 to 18 parts by mass is particularly preferable, 7 to 15 parts by mass is extremely preferable, 8 to 12 parts by mass is very preferable, and 10 to 12 parts by mass is even more preferable.

(Other ingredients)
The polycarbonate resin composition according to the present embodiment, if necessary, known resins other than the above components (polyamide resin, polyimide resin, polystyrene resin, ABS resin, polyolefin resin (polyethylene resin, polypropylene resin, etc.), phenol resin, Epoxy resin and the like).

  The polycarbonate resin composition according to the present embodiment can contain known additives other than the above components, if necessary. Examples of such additives include antioxidants (phosphorus antioxidants, phenolic antioxidants, etc.), mold release agents (glycerin fatty acid esters, etc.), lubricants (paraffin wax, n-butyl stearate, synthetic beeswax, Natural beeswax, glycerin monoester, montanic acid wax, polyethylene wax, pentaerythritol tetrastearate, etc.), colorant (titanium oxide, dye, pigment, etc.), filler (calcium carbonate, clay, silica, glass fiber, glass bulb, Glass flakes, talc, mica, various whiskers, etc.), fluidity improvers, spreading agents (epoxidized soybean oil, liquid paraffin, etc.), flame retardants (bromine compounds, phosphorus compounds, organometallic salt compounds, silicones) And the like, etc.).

(Production method of resin composition)
The polycarbonate resin composition according to this embodiment can be obtained by mixing constituent components. There is no restriction | limiting in particular as a mixing method of the structural component of the polycarbonate resin composition which concerns on this embodiment, For example, after mixing with arbitrary mixers (a tumbler, a ribbon blender, a high speed mixer, etc.), it melt-kneads with an extruder etc. A method is mentioned.

<Molded body and production method thereof>
The molded body (molded article) according to the present embodiment includes the polycarbonate resin composition according to the present embodiment. The molded body according to the present embodiment may be a film shape or a flat plate shape. Examples of the molded body according to this embodiment include a film, a tape, and a sheet. As a molded object which concerns on this embodiment, the container (for example, container for conveyance or storage of an electronic component) which accommodates an electronic component is mentioned, for example.

  As a molded object which concerns on this embodiment, a carrier tape is mentioned, for example. The carrier tape according to the present embodiment includes the polycarbonate resin composition according to the present embodiment. The carrier tape according to the present embodiment may be in the form of a film or a plate. The carrier tape according to the present embodiment may have an accommodating portion capable of accommodating an object (such as an electronic component). For example, a plurality of pocket portions (for example, spaced apart in the longitudinal direction of the tape) A recess for accommodating the object).

  Examples of the film include a molded body having a width (film width) of 100 to 1500 mm and a thickness of 0.05 to 0.5 mm. Examples of the tape (carrier tape or the like) include a molded body having a width (tape width) of 3 to 100 mm (preferably 10 to 50 mm) and a thickness of 0.05 to 0.5 mm. Examples of the sheet include a molded body having a width (sheet width) of 100 to 1500 mm and a thickness of 0.7 to 10 mm.

  The manufacturing method of the molded object which concerns on this embodiment is equipped with the shaping | molding process which shape | molds the polycarbonate resin composition which concerns on this embodiment, and obtains a molded object. The method for producing a molded body according to the present embodiment may include a plurality of molding steps, for example, a step of obtaining a resin composition by melting a molded body including the polycarbonate resin composition according to the present embodiment; You may further provide the process of shape | molding the said resin composition and obtaining a molded object. There is no restriction | limiting in particular as a shaping | molding method of the polycarbonate resin composition which concerns on this embodiment, Using well-known extrusion molding methods (T-die molding method, calender molding method, etc.), injection molding methods, injection / compression molding methods, etc. Can do.

  The manufacturing method of the carrier tape which concerns on this embodiment is equipped with the shaping | molding process which shape | molds the polycarbonate resin composition which concerns on this embodiment, and obtains a carrier tape. The carrier tape manufacturing method according to the present embodiment may include a plurality of molding steps, for example, a step of obtaining a resin composition by melting the polycarbonate resin composition according to the present embodiment, and the resin composition And a step of obtaining a carrier tape. Examples of a molding method for imparting a concave portion called a pocket portion to the carrier tape include a pressure forming method, a press molding method, and a vacuum rotary molding method.

  The embodiment has been described above as an example of the technique in the present invention. A detailed explanation was provided for this purpose. Accordingly, the components described in the detailed description include not only components essential for solving the problem but also components not essential for solving the problem in order to illustrate the above technique. obtain. Therefore, it should not be immediately recognized that these non-essential components are essential as the non-essential components are described in the detailed description. Moreover, since the above-mentioned embodiment is for demonstrating the technique in this invention, a various change, replacement, addition, omission, etc. can be performed in a claim or its equivalent range.

  EXAMPLES Hereinafter, although an Example demonstrates this invention, this invention is not limited to these Examples.

<1. Preparation of pellets>
The compounding component of content shown to Tables 1-3 was prepared. Next, the compounding components were melt-kneaded at a cylinder temperature of 280 ° C. using a 37 mm diameter twin-screw extruder (manufactured by Kobe Steel, Ltd., KTX-37) to obtain various pellets.

  The details of the used ingredients are as follows.

[Polycarbonate resin]
A-1: Polycarbonate resin synthesized from bisphenol A and phosgene, manufactured by Sumika Stylon Polycarbonate Co., Ltd., Caliber 200-13 (viscosity average molecular weight: 21000)

[Polyalkylene terephthalate resin]
B-1: Polybutylene terephthalate resin, manufactured by Polyplastics Co., Ltd., DURANEX 600FP (inherent viscosity: 1.0)

[Carbon material]
C-1: Furnace type carbon black, manufactured by Cabot, Vulcan XC-305 (specific surface area: 70 m ² / g, DBP oil absorption: 130 ml / 100 g)
C-2: Furnace type carbon black, manufactured by Mitsubishi Chemical Corporation, # 3050B (specific surface area: 50 m ² / g, DBP oil absorption: 175 ml / 100 g)

[Graft copolymer]
D-1: Core-shell type graft copolymer (core layer: silicone / acrylic rubber, shell layer: polymer having a structural unit derived from a polymer having a structural unit derived from an unsaturated carboxylic acid alkyl ester, (D -I) component), manufactured by Mitsubishi Rayon Co., Ltd., Metablen S-2001
D-2: Core-shell type graft copolymer (core layer: acrylic rubber, shell layer: polymer having a structural unit derived from unsaturated carboxylic acid alkyl ester, (D-II) component), manufactured by Mitsubishi Rayon Co., Ltd. , Metabrene W-450A
D-3: Core-shell type graft copolymer (core layer: polybutadiene, shell layer: polymer having a structural unit derived from alkyl (meth) acrylate), manufactured by Rohm and Haas Japan, Paraloid EXL2603

<2. Production of flat plate>
The pellets of item 1 were dried at 120 ° C. for 4 hours using a dryer. Next, using a small injection molding machine (manufactured by Japan Steel Works (JSW), J100EII-P), a flat plate having a size of 300 mm and a mold temperature of 90 ° C. and a size of 50 mm × 80 mm × thickness 2 mm is obtained. It was.

<3. Evaluation of conductivity>
Five flat plates of the item 2 (samples with zero repeated granulations) were prepared. Next, the surface resistivity (Ω / sq.) Near the center of the flat plate surface was measured using a conductivity meter (Loresta-GP MCP-T600, manufactured by Mitsubishi Chemical Corporation), and the average value of 5 sheets was calculated. Obtained as conductivity value.

<4. Evaluation of recyclability>
Using the pellets of item 1, granulation was repeated 5 times with a small single-screw extruder (VS-40, manufactured by Tanabe Plastics Machine Co., Ltd.) at an extrusion temperature of 300 ° C. and a screw rotation speed of 120 rpm. The pellets after granulation were repeated 5 times, and a flat plate was obtained by the same method as in item 2 above. The conductivity of this flat plate (sample after repeating granulation 5 times) was determined in the same manner as in item 3.

As a judgment of recyclability, the case where the surface specific resistance value of the flat plate after repeating granulation 5 times (5 repetitions of granulation) is less than 1 × 10 ¹⁰ (Ω / sq.) Is “A” ( “B” (recycling is good) and the surface resistivity is 1 × 10 ¹⁰ (Ω / sq.) Or more (described as “≧ 1 × 10 ¹⁰ ” in the table). The inferiority was evaluated.

<5. Evaluation of appearance of flat plate>
When the repetitive granulation was not performed (the repetitive granulation frequency was zero), the surface of the flat plate was visually observed. A case where no unevenness was observed and the surface was uniform was evaluated as “A”, and a case where unevenness was observed on the flat plate surface was evaluated as “B”.

  Each evaluation result is shown in Tables 1-3.

  As shown in Tables 1 and 2, in the examples, conductivity, recyclability, and flat plate appearance were all good.

On the other hand, as shown in Table 3, the results of the comparative examples did not satisfy the recyclability in any case.
Comparative Example 1 was a case where the content of the carbon material was small, and the conductivity and recyclability were inferior.
Comparative Example 2 was a case where the content of the carbon material was large, and the viscosity became too high, and the molding itself was difficult.
Comparative Example 3 was a case where the content of the graft copolymer was small, and the recyclability was inferior.
The comparative example 4 is a case where there is much content of a graft copolymer, and recyclability and the external appearance of a flat plate were inferior.
Comparative Example 5 was a case where no graft copolymer was used, and the conductivity, recyclability, and flat plate appearance were poor.
The comparative example 6 is a case where there is little content of a carbon material, and electroconductivity, recyclability, and the external appearance of the flat plate were inferior.

  According to the present invention, it is possible to suppress a decrease in conductivity even when repeatedly molded. For example, according to the present invention, even if it is repeatedly formed by melt extrusion for the purpose of recycling or the like, the decrease in conductivity can be suppressed to an extremely low level. Furthermore, according to the present invention, it is possible to suppress a decrease in conductivity even when repeatedly molded while achieving an excellent appearance of the molded body. Therefore, the industrial utility value of the present invention is extremely high.

Claims (4)

Containing a polycarbonate resin, a polyalkylene terephthalate resin, a carbon material, and a graft copolymer,
The graft copolymer has a structure including a core part and a covering part covering at least a part of the core part,
The content of the polycarbonate resin is 97% by mass or more based on the total amount of the polycarbonate resin and the polyalkylene terephthalate resin,
The content of the carbon material is 10 to 45 parts by mass with respect to a total of 100 parts by mass of the polycarbonate resin and the polyalkylene terephthalate resin.
The polycarbonate resin composition whose said graft copolymer is 0.5-35 mass parts with respect to a total of 100 mass parts of the said polycarbonate resin and the said polyalkylene terephthalate resin.   In the graft copolymer, the core portion includes a polymer having a structural unit derived from a monomer having an acryloyl group, and the coating portion has a structural unit derived from an unsaturated carboxylic acid ester. The polycarbonate resin composition according to claim 1, comprising:   The molded object containing the polycarbonate resin composition of Claim 1 or 2.   A carrier tape comprising the polycarbonate resin composition according to claim 1.