Resin compositions, molded articles, multilayer bodies, and pellets

Abstract

To provide resin compositions, molded articles, multilayers, and pellets with excellent adhesion to other components. [Solution] The resin composition according to this disclosure contains a polyester resin (A) and an amorphous resin (B), the mass ratio of the polyester resin (A) to the amorphous resin (B) is 10 / 90 to 90 / 10, and the ratio of the polar component to the total surface free energy of the amorphous resin (B) is 2.0 or more.

Description

[Technical Field]

[0001] This invention relates to resin compositions, molded articles, multilayer bodies, and pellets. [Background technology]

[0002] Polyester resins, such as polybutylene terephthalate resin, are used in many applications, including automotive parts, electrical and electronic components, and precision instrument parts, due to their ease of molding, excellent mechanical properties, heat resistance, chemical resistance, fragrance retention, and other physical and chemical properties. Specifically, examples include the resin compositions described in Patent Documents 1 and 2. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2013-007058 [Patent Document 2] Japanese Patent Publication No. 2020-186293 [Overview of the project] [Problems that the invention aims to solve]

[0004] Incidentally, in recent years, it has become common practice to bond molded products made from polyester resin to other components, such as other resin components, using adhesives. The present invention aims to solve these problems and to provide a resin composition, molded article, multilayer, and pellets that exhibit excellent adhesion to other components. [Means for solving the problem]

[0005] Under the above challenges, we found that these problems can be solved by blending a polyester resin (A) and an amorphous resin (B) having a ratio of polar component / total surface free energy of 2.0 or higher in a predetermined proportion. Specifically, the above problems have been solved by the following means. [1] A resin composition containing a polyester resin (A) and an amorphous resin (B), wherein the mass ratio of the polyester resin (A) to the amorphous resin (B) is 10 / 90 to 90 / 10, and the ratio of the polar component of the surface free energy of the amorphous resin (B) to the total is 2.0 or more. [2] The resin composition according to [1], wherein the surface free energy of the polar component of the amorphous resin (B) is 0.8 mJ / m 2 [3] The resin composition according to [1] or [2], wherein the amorphous resin (B) contains a styrene-based resin. [4] The resin composition according to any one of [1] to [3], wherein the amorphous resin (B) contains an acrylonitrile unit. [5] The resin composition according to any one of [1] to [4], which is used for adhesion to other members. [6] The resin composition according to any one of [1] to [5], wherein the surface free energy of the polar component of the amorphous resin (B) is 0.8 mJ / m 2 and the amorphous resin (B) contains a styrene-based resin, and the amorphous resin (B) contains an acrylonitrile unit, and which is used for adhesion to other members. [7] A molded article formed from the resin composition according to any one of [1] to [6]. [8] A multilayer body having the molded article according to [7] and another member directly or bonded through at least an adhesive. [9] Pellets of the resin composition according to any one of [1] to [6].

[10] A molded article formed from the pellets according to [9]. [Effect of the Invention]

[0006] According to the present invention, it has become possible to provide a resin composition, a molded article, a multilayer body, and pellets having excellent adhesion to other members. [Brief Description of the Drawings]

[0007] [Figure 1] It is a schematic diagram showing a method for measuring the adhesive strength in the examples.

Mode for Carrying Out the Invention

[0008] Hereinafter, a mode for carrying out the present invention (hereinafter simply referred to as "this embodiment") will be described in detail. Note that the following embodiments are examples for explaining the present invention, and the present invention is not limited to only these embodiments. In this specification, "~" is used to mean including the numerical values described before and after it as the lower limit value and the upper limit value. In this specification, various physical property values and characteristic values are assumed to be those at 23 °C unless otherwise specified.

[0009] In this specification, unless otherwise specified, the weight average molecular weight and the number average molecular weight are measured by the GPC (gel permeation chromatography) method using HLC-8320GPC EcoSEC manufactured by Tosoh Corporation, using tetrahydrofuran as a solvent, using Shodex KF-G, KF-805L×3, and KF-800D as columns, at a column temperature of 40 °C and a flow rate of 1.2 mL / min, and detected at a detection wavelength of 254 nm, and are values in terms of polystyrene conversion. When the measurement methods and the like described according to the standards shown in this specification differ depending on the year, unless otherwise specified, they are based on the standards as of January 1, 2023. In FIG. 1, the scale and the like may not match the actual situation.

[0010] The resin composition of this embodiment contains a polyester resin (A) and an amorphous resin (B), the mass ratio of the polyester resin (A) to the amorphous resin (B) is 10 / 90 to 90 / 10, and the ratio of the polar component / total of the surface free energy of the amorphous resin (B) is 2.0 or more. By adopting such a configuration, it becomes possible to provide a molded product having excellent adhesiveness to other members. Polyester resins, particularly polybutylene terephthalate resins, are not known for their good adhesion to other materials. To improve the adhesion of polyester resins to other materials, the incorporation of amorphous resins was considered. In this embodiment, it is presumed that by using an amorphous resin with a high proportion of polar components in its surface free energy, the affinity to materials with polar groups was improved, thereby enhancing adhesion.

[0011] The embodiments of the present invention will be described in detail below, but the description of the constituent elements described below is merely one example of an embodiment of the present invention and is not limited to these. The details of this embodiment will be described below.

[0012] <Polyester resin (A)> The resin composition of this embodiment includes a polyester resin (A). The polyester resin (A) is a polyester obtained by polycondensation of a dicarboxylic acid compound and a dihydroxy compound, polycondensation of an oxycarboxylic acid compound, or polycondensation of these compounds, and may be either a homopolyester or a copolyester. The polyester resin (A) used in this embodiment is preferably a polyalkylene terephthalate resin, more preferably a polyethylene terephthalate resin and / or a polybutylene terephthalate resin, and even more preferably a polybutylene terephthalate resin.

[0013] As the dicarboxylic acid compound constituting the polyester resin (A), aromatic dicarboxylic acids or their ester-forming derivatives are preferably used. Examples of aromatic dicarboxylic acids include terephthalic acid, isophthalic acid, orthophthalic acid, 1,5-naphthalenedicarboxylic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, biphenyl-2,2'-dicarboxylic acid, biphenyl-3,3'-dicarboxylic acid, biphenyl-4,4'-dicarboxylic acid, diphenyl ether-4,4'-dicarboxylic acid, diphenylmethane-4,4'-dicarboxylic acid, diphenylsulfone-4,4'-dicarboxylic acid, diphenylisopropylidene-4,4'-dicarboxylic acid, 1,2-bis(phenoxy)ethane-4,4'-dicarboxylic acid, anthracene-2,5-dicarboxylic acid, anthracene-2,6-dicarboxylic acid, p-tert-phenylene-4,4'-dicarboxylic acid, pyridine-2,5-dicarboxylic acid, etc., with terephthalic acid being preferred.

[0014] These aromatic dicarboxylic acids may be used in combination of two or more types. As is well known, they can be used in polycondensation reactions not only as free acids but also as ester-forming derivatives such as dimethyl esters. Furthermore, in small amounts, these aromatic dicarboxylic acids can be used in combination with one or more aliphatic dicarboxylic acids such as adipic acid, azelaic acid, dodecanedionic acid, and sebacic acid, or alicyclic dicarboxylic acids such as 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, and 1,4-cyclohexanedicarboxylic acid.

[0015] Examples of dihydroxy compounds constituting the polyester resin (A) include aliphatic diols such as ethylene glycol, propylene glycol, butanediol, hexylene glycol, neopentyl glycol, 2-methylpropane-1,3-diol, diethylene glycol, and triethylene glycol, as well as alicyclic diols such as cyclohexane-1,4-dimethanol, and mixtures thereof. In small amounts, one or more long-chain diols with molecular weights of 400 to 6,000, such as polyethylene glycol, poly-1,3-propylene glycol, and polytetramethylene glycol, may be copolymerized. In addition, aromatic diols such as hydroquinone, resorcinol, naphthalenediol, dihydroxydiphenyl ether, and 2,2-bis(4-hydroxyphenyl)propane can also be used.

[0016] In addition to the difunctional monomers mentioned above, small amounts of trifunctional monomers such as trimellitic acid, trimesic acid, pyromellitic acid, pentaerythritol, and trimethylolpropane can also be used to introduce branched structures, as well as monofunctional compounds such as fatty acids to adjust molecular weight. The polyester resin (A) is usually composed mainly of a polycondensation of a dicarboxylic acid and a diol, that is, 50% by mass, preferably 70% by mass or more of the total polyester resin (A) consists of this polycondensate. Aromatic carboxylic acids are preferred as the dicarboxylic acid, and aliphatic diols are preferred as the diol.

[0017] Of these, polyalkylene terephthalate resins are preferred, in which 95 mol% or more of the acid component is terephthalic acid and 95% by mass or more of the alcohol component is an aliphatic diol. Typical examples include polybutylene terephthalate resin and polyethylene terephthalate resin, with polybutylene terephthalate resin being preferred. These are preferably close to homopolyesters, that is, in which 95% by mass or more of the total resin consists of the terephthalic acid component and the 1,4-butanediol or ethylene glycol component.

[0018] Polyester resin (A) is also preferably copolymerized with isophthalic acid, dimer acid, polyalkylene glycol such as polytetramethylene glycol (PTMG), etc. Examples of these copolymers include those in which the copolymerization amount is 1 mol% or more and less than 50 mol% of the total segments of polyalkylene terephthalate.

[0019] The polyester resin (A) used in this embodiment may include recycled materials. Examples of recycled polyester resins include those obtained by material recycling, which involves pulverizing, washing, and reusing the scrap and defective products of molded articles and recycled used polyester resin molded bodies, and those obtained by chemical recycling (chemical decomposition method). The intrinsic viscosity of the polyester resin (A) is preferably 0.50 dL / g or more, more preferably 0.60 dL / g or more, and even more preferably 0.65 dL / g or more. The intrinsic viscosity is preferably 0.80 dL / g or less, more preferably 0.78 dL / g or less, even more preferably 0.75 dL / g or less, and still more preferably 0.73 dL / g or less. By setting the intrinsic viscosity to be not more than the above upper limit value, the heat deflection temperature tends to increase, the heat resistance tends to be further improved, and the adhesiveness tends to increase. Also, by setting the intrinsic viscosity to be not less than the above lower limit value, the mechanical properties such as tensile strength and flexural strength tend to be further improved.

[0020] The intrinsic viscosity of the polyester resin (A) is measured by the following method. In a mixed solvent of phenol / 1,1,2,2-tetrachloroethane (mass ratio 1 / 1), polybutylene terephthalate resin pellets are stirred and dissolved at 110°C for 1 hour so that the concentration becomes 1.00 g / dL. Then, it is cooled to 30°C. Using an automatic solution viscometer, the dropping seconds of the sample solution and the dropping seconds of only the solvent are measured at 30°C, and the intrinsic viscosity is calculated by the formula. Intrinsic viscosity = ((1 + 4K H η sp ) 0.5 -1) / (2K H C) Here, η sp = η / η0 - 1, where η is the dropping seconds of the sample solution, η0 is the dropping seconds of only the solvent, C is the sample solution concentration (g / dL), and K H is the Huggins constant. K H is taken as 0.33.

[0021] The concentration of terminal carboxyl groups in polyester resin (A) is preferably 1 to 23 eq / ton, and more preferably 7 to 20 eq / ton. This range tends to improve the fluidity of the resin composition. In this embodiment, if the resin composition contains two or more polyester resins (A), the terminal carboxyl group concentration of polyester resin (A) shall be the same as the terminal carboxyl group concentration of the mixture. The amount of terminal carboxyl groups can be determined by dissolving 0.5 g of polyester resin (A) in 25 mL of benzyl alcohol and titrating with a 0.01 mol / L benzyl alcohol solution of sodium hydroxide.

[0022] One example of the blend form of the polyester resin (A) in this embodiment is that it contains at least polybutylene terephthalate resin. In the first embodiment, the mass ratio of polybutylene terephthalate resin is preferably 30% by mass or more, more preferably 50% by mass or more, even more preferably 52% by mass or more, even more preferably 70% by mass or more, even more preferably 80% by mass or more, even more preferably 90% by mass or more, and may also be 95% by mass or more, based on 100% by mass of polyester resin (A). Setting it above the lower limit tends to result in a higher load deflection temperature and better moldability. In the first embodiment, the mass ratio of polybutylene terephthalate resin may be 100% by mass of 100% by mass of polyester resin (A) contained in the resin composition, or depending on the application, it may be 90% by mass or less, 70% by mass or less, or 60% by mass or less. In the above blend configuration, polyethylene terephthalate resin is preferred as the resin other than polybutylene terephthalate resin. In the above blend form, it is particularly preferable that the blend contains 30% by mass or more (preferably 50% by mass or more) of polybutylene terephthalate resin in 100% by mass of polyester resin (A), and that the total of polybutylene terephthalate resin and polyethylene terephthalate resin (the content of polyethylene terephthalate resin may be 0% by mass) accounts for 90% by mass or more (preferably 95% by mass or more) of 100% by mass of polyester resin (A). By incorporating polyethylene terephthalate resin, the warping of the resulting molded product tends to be suppressed more effectively.

[0023] In this embodiment, the resin composition preferably contains polyester resin (A) in a proportion of 20% by mass or more, more preferably 25% by mass or more, even more preferably 30% by mass or more, and also preferably 50% by mass or less, more preferably 45% by mass or less, and even more preferably 40% by mass or less. The resin composition in this embodiment may contain only one type of polyester resin (A), or it may contain two or more types. When it contains two or more types, it is preferable that the total amount is within the above range.

[0024] <Amorphous resin (B)> The resin composition of this embodiment may also contain amorphous resin (B). The amorphous resin (B) is not specified in any particular way, but is usually an amorphous thermoplastic resin, and examples include styrene resins, polycarbonate resins, acrylic resins, and modified polyphenylene ether resins. Styrene resins and / or polycarbonate resins are preferred, styrene resins are more preferred, and acrylonitrile-styrene resins are preferred. Furthermore, it is preferable that the amorphous resin (B) used in this embodiment contains acrylonitrile units.

[0025] In this embodiment, the ratio of the polar component to the surface free energy of the amorphous resin (B) (ratio of polar component to total surface free energy) is 2.0 or more, preferably 3.0 or more, preferably 3.5 or more, more preferably 7.0 or more, even more preferably 9.0 or more, and preferably 20.0 or less, and may also be 15.0 or less. Setting it below the upper limit tends to further improve adhesion. Conversely, setting it above the lower limit tends to further improve the basic physical properties of the resin composition. If the resin composition of this embodiment contains two or more amorphous resins (B), the above value shall be a weighted average value.

[0026] In this embodiment, the polar component of the surface free energy of the amorphous resin (B) is 0.8 mJ / m 2 Preferably, it should be 1.0 mJ / m 2 It is more preferable that the value be greater than or equal to 1.5 mJ / m 2 It is even more preferable that it be 2.0 mJ / m 2 It is even more preferable that it be 3.0 mJ / m 2 It is even more preferable that the value be greater than or equal to 4.0 mJ / m 2 It is even more preferable that the value be greater than or equal to 5.0 mJ / m 2 It is especially preferable that the value be greater than or equal to 10.0 mJ / m 2 Preferably, the following is true: 8.0 mJ / m 2 It may also be less than 7.0 mJ / m 2 The following is also acceptable. Setting the value above the lower limit tends to further improve adhesion. Conversely, setting the value below the upper limit tends to further improve the basic physical properties of molded articles obtained from the resin composition.

[0027] The total surface free energy of the amorphous resin (B) used in this embodiment is 40 mJ / m 2 Preferably, it should be 44 mJ / m 2 It is more preferable that it be above 49 J / m 2It is even more preferable that the concentration be greater than or equal to 100 mJ / m³. 2 Preferably, the following is true: 80 mJ / m 2 It may also be less than 70 mJ / m 2 The following is also acceptable. Setting the value above the lower limit tends to improve adhesion. Conversely, setting the value below the upper limit tends to improve the basic physical properties of molded articles obtained from the resin composition. The method for measuring the surface free energy described above will follow the description in the examples below.

[0028] The amorphous resin used in this embodiment may be a virgin amorphous resin or a recycled amorphous resin. Examples of recycled amorphous resins include those obtained through material recycling, which involves crushing and washing recovered used amorphous resin molded products for reuse, and those obtained through chemical recycling (chemical decomposition). In this embodiment, material recycled products are preferred.

[0029] <<Styrene resin>> The styrene resin used in this embodiment may be a virgin styrene resin or a recycled amorphous styrene resin. Examples of polystyrene resins include homopolymers of styrene monomers and copolymers of styrene monomers and monomers copolymerizable with styrene monomers. In copolymers of styrene monomers and copolymerizable monomers, it is preferable that 50% by mass or more of the total monomer is styrene monomer, more preferably 60% by mass or more is styrene monomer, and preferably 100% by mass or less is styrene monomer.

[0030] Styrene monomers refer to styrene and styrene having substituents, and include styrene, α-methylstyrene, p-methylstyrene, vinylxylene, ethylstyrene, dimethylstyrene, p-tert-butylstyrene, vinylnaphthalene, methoxystyrene, monobromstyrene, dibromstyrene, fluorostyrene, and tribromstyrene, with styrene and α-methylstyrene being more preferred, and styrene being particularly preferred. Furthermore, among the monomers that make up styrene-based resins, monomers other than styrene-based monomers include (meth)acrylic acid ester monomers, maleimide monomers such as maleimide, N-methylmaleimide, and N-phenylmaleimide, and rubbers such as acrylic acid, methacrylic acid, and butadiene.

[0031] The styrene resin used in this embodiment may include rubber-reinforced polystyrene resin. Specific examples of rubber-reinforced polystyrene resin include acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer (ABS resin), acrylonitrile-acrylic rubber-styrene copolymer (AAS resin), acrylonitrile-styrene-acrylic rubber copolymer (ASA resin), acrylonitrile-ethylene propylene-rubber-styrene copolymer (AES resin), styrene-IPN type rubber copolymer, and other resins.

[0032] In this embodiment, the polystyrene resin preferably contains at least one selected from acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer (ABS resin), acrylonitrile-acrylic rubber-styrene copolymer (AAS resin), acrylonitrile-styrene-acrylic rubber copolymer (ASA resin), and acrylonitrile-ethylene propylene rubber-styrene copolymer (AES resin), more preferably contains at least one selected from AS resin, ABS resin, and ASA resin, even more preferably contains AS resin and / or ASA resin, and even more preferably contains AS resin.

[0033] <<Polycarbonate resin>> The polycarbonate resin used in this embodiment may be virgin polycarbonate resin or recycled polycarbonate resin, but recycled polycarbonate resin is preferred.

[0034] Polycarbonate resin is a branched thermoplastic polymer or copolymer obtained by reacting a dihydroxy compound, or a small amount thereof, with a polyhydroxy compound with phosgene or a diester carbonate.

[0035] The dihydroxy compounds used as raw materials are substantially free of bromine atoms, and aromatic dihydroxy compounds are preferred. Specifically, examples include 2,2-bis(4-hydroxyphenyl)propane (i.e., bisphenol A), tetramethylbisphenol A, bis(4-hydroxyphenyl)-p-diisopropylbenzene, hydroquinone, resorcinol, 4,4-dihydroxydiphenyl, etc., with bisphenol A being preferred. In addition, compounds in which one or more tetraalkylphosphonium sulfonates are bonded to the above aromatic dihydroxy compounds can also be used.

[0036] Among the polycarbonate resins mentioned above, aromatic polycarbonate resins derived from 2,2-bis(4-hydroxyphenyl)propane, or aromatic polycarbonate copolymers derived from 2,2-bis(4-hydroxyphenyl)propane and other aromatic dihydroxy compounds are preferred. Alternatively, copolymers mainly composed of aromatic polycarbonate resins, such as copolymers with polymers or oligomers having a siloxane structure, may also be used. Furthermore, two or more of the above-mentioned polycarbonate resins may be mixed and used.

[0037] To adjust the molecular weight of polycarbonate resin, monovalent aromatic hydroxy compounds can be used, such as m- and p-methylphenol, m- and p-propylphenol, p-tert-butylphenol, and p-long-chain alkyl-substituted phenols.

[0038] The viscosity-average molecular weight (Mv) of the polycarbonate resin is preferably 10,000 or higher, more preferably 12,000 or higher, even more preferably 13,000 or higher, and particularly preferably exceeding 14,000. If a viscosity-average molecular weight lower than 10,000 is used, the resulting resin composition tends to have low mechanical strength, such as impact resistance. Furthermore, the Mv is preferably 60,000 or lower, more preferably 40,000 or lower, even more preferably 35,000 or lower, even more preferably 30,000 or lower, and may also be 25,000 or lower or 20,000 or lower. If it is higher than 60,000, the fluidity of the resin composition may deteriorate, resulting in poor moldability.

[0039] In this invention, the viscosity-average molecular weight (Mv) of the polycarbonate resin is determined by measuring the viscosity of a methylene chloride solution of the polycarbonate resin at 25°C using an Ubbelohde viscometer, finding the intrinsic viscosity ([η]), and then calculating the value from Schnell's viscosity formula. [η] = 1.23 × 10 -4 Mv 0.83

[0040] The melt flow rate (MFR) of polycarbonate resin, measured according to JIS K7210 (temperature 300°C, load 1.20 kgf), is preferably 3 to 100 g / 10 min, and more preferably 6 to 70 g / 10 min. When the MFR is within the above range, the effects of the present invention tend to be exhibited more effectively. The melt volume rate (MVR) of polycarbonate resin, measured according to JIS K7210 (temperature 300°C, load 1.20 kgf), is 0.5 to 20 cm³. 3 It is preferable that the value is g / 10 mins, and the distance is 1-10 cm. 3 A value of 10 minutes is more preferable. When the MVR is within the above range, the effects of the present invention tend to be exhibited more effectively.

[0041] The method for producing the polycarbonate resin is not particularly limited, and polycarbonate resin produced by either the phosgene method (interfacial polymerization method) or the melting method (transesterification method) can be used. Furthermore, polycarbonate resin produced by the melting method and then subjected to post-treatment to adjust the amount of terminal OH groups is also preferred.

[0042] The amorphous resin content in the resin composition of this embodiment is preferably 1 part by mass or more, more preferably 10 parts by mass or more, even more preferably 30 parts by mass or more, even more preferably 50 parts by mass or more, even more preferably 80 parts by mass or more, and also preferably 120 parts by mass or less, more preferably 100 parts by mass or less, and even more preferably 90 parts by mass or less. Setting the content above the lower limit tends to further improve the low warpage and low shrinkage effect of the resin composition. Setting the content below the upper limit tends to further improve the heat resistance of the resin composition.

[0043] The total content of polybutylene terephthalate resin and amorphous resin in the resin composition of this embodiment is more preferably 30% by mass or more, even more preferably 40% by mass or more, even more preferably 50% by mass or more, and preferably 70% by mass or less, and more preferably 60% by mass or less, based on 100% by mass of the resin composition. The resin composition of this embodiment may contain only one type of amorphous resin, or it may contain two or more types. When it contains two or more types, it is preferable that the total amount is within the above range.

[0044] <Mass ratio of polyester resin (A) and amorphous resin (B)> In the resin composition of this embodiment, the mass ratio of polyester resin (A) to amorphous resin (B) is 10 / 90 to 90 / 10. More specifically, the content of polyester resin (A) is preferably 20 parts by mass or more, more preferably 30 parts by mass or more, even more preferably 40 parts by mass or more, even more preferably 50 parts by mass or more, even more preferably more than 50 parts by mass, even more preferably 52 parts by mass or more, and also preferably 65 parts by mass or less, more preferably 60 parts by mass or less, and even more preferably 58 parts by mass or less. Furthermore, in the resin composition of this embodiment, the content of polyester resin (A) is preferably 30 parts by mass or more, more preferably 35 parts by mass or more, even more preferably 40 parts by mass or more, even more preferably 45 parts by mass or more, and also preferably 70 parts by mass or less, more preferably 65 parts by mass or less, even more preferably 60 parts by mass or less, and even more preferably 55 parts by mass or less. By setting the value above the lower limit, the low warpage and reduced molding shrinkage effect of molded articles obtained from the resin composition tend to improve further. Conversely, by setting the value below the upper limit, the heat resistance and basic physical properties of molded articles obtained from the resin composition tend to improve further.

[0045] <Acid content in the resin composition> The resin composition of this embodiment preferably has an acid content of 0.5% by mass or more. By setting it above the lower limit, excellent adhesion of the resulting molded product to other components can be achieved. The acid content in the resin composition is preferably 0.55% by mass or more, more preferably 0.60% by mass or more, even more preferably 0.70% by mass or more, even more preferably 1.0% by mass or more, and even more preferably 1.4% by mass or more. Furthermore, the upper limit of the acid content in the resin composition is preferably 5.0% by mass or less, more preferably 3.0% by mass or less, even more preferably 2.5% by mass or less, even more preferably 2.2% by mass or less, even more preferably 2.0% by mass or less, even more preferably 1.9% by mass or less, and even more preferably 1.8% by mass or less. Setting it below the upper limit tends to further improve the basic physical properties and surface appearance of the molded product. The acid content in the resin composition can be calculated by multiplying the acid content in the acid-modified polymer (C) and other acid-containing components in 100 parts by mass of the resin composition by the respective acid content ratios, provided that the acid content in the acid-modified polymer (C) and other acid-containing components is known through measurement or other means. Furthermore, if the acid content in the acid-modified polymer (C) and other acid-containing components is unknown, the resin composition is dissolved in a soluble solvent, the solvent is evaporated from the resulting solution, and the remaining substance (residue) is dissolved in a deuterated solvent for NMR measurement. The amount of acid groups is then measured by NMR, and the acid content is calculated from this measurement. If acid groups cannot be confirmed by NMR measurement, the amount of acid groups can also be calculated by dissolving the residue in a soluble solvent, adding an indicator, and titrating with a basic solvent.

[0046] The amount of the above acid can be adjusted with any component, but examples include adjusting it by incorporating an acid-modified polymer (C) or using an acid-modified amorphous resin (B). In this embodiment, it is preferable that the resin composition contains an acid-modified polymer (C).

[0047] <<Acid-modified polymer (C)>> The acid-modified polymer (C) may be a crystalline resin or an amorphous resin, but an amorphous resin is preferred. By using an amorphous resin, in addition to improving adhesion to other components, warp resistance can be effectively achieved. Furthermore, the acid-modified polymer (C) may be a thermoplastic resin or a thermosetting resin, but a thermoplastic resin is preferred. In the event that a material falls under either amorphous resin (B) or acid-modified polymer (C), it shall be considered as acid-modified polymer (C) in this specification.

[0048] The acid-modified polymer (C) may consist only of acid group-containing monomer units, but it is preferable that it contains other monomer units in addition to acid group-containing monomer units, preferably at least one of aromatic vinyl group-containing monomer units and olefin group-containing monomer units in addition to acid group-containing monomer units (preferably maleic anhydride group-containing monomer units), more preferably at least one of styrene group-containing monomer units and olefin group-containing monomer units in addition to acid-modified monomer units, and even more preferably at least one of styrene group-containing monomer units in addition to acid-modified monomer units. Including styrene monomer units in addition to acid-modified monomer units tends to significantly improve not only adhesion but also low warping.

[0049] Examples of aromatic vinyl monomers include styrene sulfonates such as styrene, sodium styrenesulfonate, and ammonium styrenesulfonate; styrene sulfonate esters such as ethyl styrenesulfonate; styrene alkyl ethers such as t-butoxystyrene; styrene derivatives such as acetoxystyrene and vinylbenzoic acid; and α-methylstyrene and α-methylstyrene derivatives. These may be used individually or in combination of two or more. Examples of olefin monomers include α-olefins such as ethylene and propylene. These may be used individually or in combination of two or more. The content of aromatic vinyl monomer units and / or olefin monomers in the acid-modified polymer is preferably 2% by mass or more, and preferably 98% by mass or less.

[0050] The acid-modified polymer (C) may contain other monomer units in addition to those mentioned above. Preferred other monomers include acrylic monomers and maleimide monomers. Examples of acrylic monomers include methyl methacrylate and methyl acrylate. Examples of maleimide monomers include maleimide monomers such as N-methylmaleimide, N-ethylmaleimide, N-cyclohexylmaleimide, and N-phenylmaleimide. Acrylonitrile is also an example. The acid modification of the acid-modified polymer (C) is preferably carried out by an acid and / or anhydride, and more preferably by an acid anhydride. Specifically, the acid modification of the polymer is preferably carried out by an organic acid and its acid anhydride, more preferably by carboxylic acids and carboxylic anhydrides, even more preferably by phthalic acid and phthalic anhydride, succinic acid and succinic anhydride, benzoic acid and benzoic anhydride, maleic acid and maleic anhydride, even more preferably by maleic acid and maleic anhydride, and even more preferably by maleic anhydride.

[0051] The acid-modified polymer (C) used in this embodiment preferably includes a maleic anhydride-modified polymer, more preferably at least one of styrene-maleic anhydride copolymer, styrene-N-phenylmaleid-maleic anhydride copolymer, and α-olefin-maleic anhydride copolymer, and even more preferably styrene-maleic anhydride copolymer. In this embodiment, it is preferable that the acid-modified polymer (C) used is configured such that the sum of the acid group monomer units, aromatic vinyl group-containing monomer units, and other monomer units added as needed accounts for 100% by mass of the total of all constituent units excluding terminal groups.

[0052] The acid-modified polymer (C) may also be an acid-modified impact modifier. The acid-modified impact modifier that can be used in this embodiment is at least one acid-modified elastomer consisting of an acid-modified olefin-based elastomer and an acid-modified styrene-based elastomer (excluding those corresponding to amorphous resin (B)).

[0053] As for the olefin-based elastomer, it is sufficient to have a polyolefin portion in the soft phase, and ethylene propylene rubber such as EPR and EPDM can be preferably used.

[0054] Styrene-based elastomers typically consist of a styrene component and an elastomer component, with the styrene component usually present in a proportion of 5 to 80% by mass, preferably 10 to 50% by mass, and particularly preferably 15 to 30% by mass. Examples of elastomer components include conjugated diene hydrocarbons such as butadiene, isoprene, and 1,3-pentadiene. More specifically, styrene-based elastomers include styrene-butadiene copolymer (SBS) elastomers and styrene-isoprene copolymer (SIS) elastomers.

[0055] In this embodiment, the acid modification of the acid-modified impact modifier refers to introducing cyclic anhydrides or carboxylic acid groups into the copolymer side chains using cyclic acid anhydrides such as maleic anhydride, phthalic anhydride, glutaric anhydride, or succinic anhydride. Acid denaturation can be introduced using commonly performed methods, such as graft copolymerization and random copolymerization. Examples of such acid-modified impact modifiers include Asahi Kasei's "ToughTec M1913," Arkema's "Rotada 4613," and Mitsui Chemicals' "Toughmer MP0610."

[0056] The percentage of acid modification (percentage of acid) in the acid-modified polymer (C) is preferably 1% by mass or more, preferably 5% by mass or more, preferably 10% by mass or more, preferably 15% by mass or more, preferably 20% by mass or more, and preferably 25% by mass or more. Furthermore, it is preferably 50% by mass or less, and more preferably 35% by mass or less. The acid content in the acid-modified polymer (C) in the resin composition can be calculated by dissolving the resin composition in a soluble solvent, evaporating the solvent from the resulting solution, dissolving the remaining substance (residue) in a deuterated solvent for NMR measurement, and measuring the amount of acid groups by NMR. If acid groups cannot be confirmed by NMR measurement, the amount of acid groups can also be calculated by dissolving the residue in a soluble solvent, adding an indicator, and titrating with a basic solvent. The aforementioned soluble solvent and the solvent used for NMR measurement are preferably solvents in which the resin component in the composition is soluble, and examples include, but are not limited to, dichloromethane, methanol, and chloroform.

[0057] The weight-average molecular weight of the acid-modified polymer (C) is preferably 50,000 or more, more preferably 80,000 or more, even more preferably 90,000 or more, and even more preferably 100,000 or more. Setting it above the lower limit tends to improve mechanical properties such as tensile strength and bending strength. Furthermore, the weight-average molecular weight of the acid-modified polymer (C) is preferably 500,000 or less, more preferably 400,000 or less, even more preferably 300,000 or less, and even more preferably 200,000 or less. Setting it below the upper limit increases the probability of the acid-modified polymer, and consequently the acid (acid group), being present on the surface of the resulting molded product, and tends to further improve the adhesion of the resin composition to other components. In this embodiment, if the resin composition contains two or more acid-modified polymers (C), the weight-average molecular weight of the mixture is used.

[0058] In this embodiment, the acid value of the acid-modified polymer (C) is greater than 0 mgKOH / g, preferably 0.5 mgKOH / g or more, more preferably 2 mgKOH / g or more, even more preferably 5 mgKOH / g or more, and even more preferably 10 mgKOH / g or more. Depending on the application, it may be 15 mgKOH / g or more. By setting it above the lower limit, the decomposition of the polyester resin (A) can be suppressed more effectively. Furthermore, the upper limit of the acid value of the acid-modified polymer (C) is preferably 100 mgKOH / g or less, more preferably 90 mgKOH / g or less, and even more preferably 80 mgKOH / g or less. Depending on the application, it may be 70 mgKOH / g or less, 60 mgKOH / g or less, 50 mgKOH / g or less, 40 mgKOH / g or less, or 35 mgKOH / g or less. By setting it below the upper limit, the deterioration of the mechanical properties of the molded product tends to be effectively suppressed. If the resin composition in this embodiment contains two or more acid-modified polymers (C), the acid value shall be the acid value of the mixture.

[0059] In this embodiment, the content of the acid-modified polymer (C) in the resin composition is preferably 1 part by mass or more, more preferably 2 parts by mass or more, and may be 6 parts by mass or more, or 8 parts by mass or more, based on 100 parts by mass of the total of the polyester resin (A) and amorphous resin (B). Setting it above the lower limit increases the probability of acid being present on the surface of the molded product, and tends to further improve the adhesion of the resulting molded product to other components. Furthermore, the upper limit of the content of the acid-modified polymer (C) is preferably 40 parts by mass or less, more preferably 25 parts by mass or less, and may be 20 parts by mass or less, or 15 parts by mass or less, based on 100 parts by mass of the total of the polyester resin (A) and amorphous resin (B). Setting it below the upper limit tends to further improve the heat resistance of the resin composition. The resin composition in this embodiment may contain only one type of acid-modified polymer (C), or it may contain two or more types. When it contains two or more types, it is preferable that the total amount is within the above range.

[0060] <Other ingredients> The resin composition of this embodiment may contain other components as needed, as long as they do not significantly impair the desired physical properties. Examples of other components include reinforcing materials (such as glass fibers) and various resin additives. Note that the other components may be present individually, or two or more may be present in any combination and ratio. Examples of various resin additives include flame retardants, flame retardant enhancers, anti-dripping agents, stabilizers, mold release agents, reactive compounds, colorants (pigments, dyes), UV absorbers, antistatic agents, anti-fogging agents, anti-blocking agents, flow improvers, plasticizers, dispersants, and antibacterial agents. The resin composition of this embodiment is prepared so that the total of the polyester resin (A), amorphous resin (B), and other selectively blended components is 100% by mass. One example of the resin composition of this embodiment is that the total of the polyester resin (A), amorphous resin (B), acidic polymer (C), and reinforcing agent accounts for 95% by mass or more of the resin composition. Another example of the resin composition of this embodiment is that the total of the polyester resin (A), amorphous resin (B), acidic polymer (C), reinforcing agent, flame retardant, mold release agent, stabilizer, reactive compound, and colorant accounts for 99% by mass or more of the resin composition.

[0061] <<Reinforcement material>> The resin composition of this embodiment may contain a reinforcing material. By including a reinforcing material, the mechanical strength of the resulting molded product can be increased. Reinforcements can include fibrous materials such as glass fibers, carbon fibers, basalt fibers, wollastonite, and potassium titanate fibers. Granular or amorphous reinforcements such as calcium carbonate, titanium oxide, feldspar minerals, clay, and glass beads; and flake-like reinforcements such as glass flakes and graphite can also be used. Among these, fibrous reinforcements, particularly glass fibers, are preferred from the viewpoint of mechanical strength, rigidity, and heat resistance. The glass fibers consist of glass compositions such as A glass, C glass, E glass, S glass, D glass, M glass, and R glass, and E glass (alkali-free glass) is particularly preferred because it does not adversely affect the polybutylene terephthalate resin. Fibers are defined as materials that, when cut perpendicular to their length, have a circular, elliptical, or polygonal cross-sectional shape, and whose length is sufficiently long relative to their cross-sectional area, exhibiting a fibrous appearance.

[0062] The glass fibers used in the resin composition of this embodiment may be single fibers or multiple single fibers twisted together. The glass fibers can take any form, including "glass roving" (single fibers or multiple strands twisted together and wound continuously), "chopped strands" (cut to a length of 1-10 mm), or "milled fibers" (pulverized to a length of 10-500 μm), but chopped strands are preferred. Such glass fibers are commercially available from Asahi Fiber Glass Co., Ltd. under the product names "Glasslon Chopped Strands" and "Glasslon Milled Fiber," and are readily available. Different forms of glass fibers can also be used in combination.

[0063] Furthermore, in this embodiment, glass fibers having an irregular cross-sectional shape are also preferred. This irregular cross-sectional shape refers to a flattening ratio, indicated by the major axis / minor axis ratio (D2 / D1) when the major axis of the cross-section perpendicular to the length direction of the fiber is D2 and the minor axis is D1, where D2 is the major axis and D1 is the minor axis, and which is, for example, 1.5 to 10, more preferably 2.5 to 10, even more preferably 2.5 to 8, and particularly preferably 2.5 to 5. For such flattened glass, refer to paragraphs 0065 to 0072 of Japanese Patent Application Publication No. 2011-195820, and this content is incorporated herein.

[0064] When the resin composition of this embodiment contains a reinforcing material (preferably glass fiber), its content is preferably 25 parts by mass or more, more preferably 30 parts by mass or more, even more preferably 35 parts by mass or more, even more preferably 40 parts by mass or more, and even more preferably 45 parts by mass or more, based on 100 parts by mass of the total of polyester resin (A) and amorphous resin (B). Setting it above the lower limit tends to further improve the mechanical strength of the resulting molded article. The upper limit of the reinforcing material content is preferably 100 parts by mass or less, more preferably 80 parts by mass or less, even more preferably 70 parts by mass or less, even more preferably 60 parts by mass or less, and even more preferably 55 parts by mass or less, based on 100 parts by mass of the total of polyester resin (A) and amorphous resin (B). Setting it below the upper limit tends to improve the surface appearance of the molded article.

[0065] Furthermore, if the resin composition of this embodiment contains a reinforcing material (preferably glass fiber), its content is preferably 20% by mass or more, more preferably 25% by mass or more, and even more preferably 28% by mass or more. Setting it above the lower limit tends to further improve the mechanical hardness of the resulting absorbent resin member. The upper limit of the reinforcing material content is preferably 50% by mass or less, more preferably 45% by mass or less, even more preferably 40% by mass or less, and may also be 35% by mass or less. Setting it below the upper limit tends to further improve mechanical properties such as tensile strength and bending strength, as well as heat resistance. The resin composition of this embodiment may contain only one type of reinforcing material, or it may contain two or more types. When it contains two or more types, it is preferable that the total amount is within the above range.

[0066] <<Flame retardant>> The resin composition of this embodiment may contain a flame retardant. By including a flame retardant, flame retardancy of the resulting molded article can be achieved. Examples of flame retardants include halogen-based flame retardants, phosphorus-based flame retardants (e.g., phosphinate metal salts, polyphosphate melamine), nitrogen-based flame retardants (e.g., cyanurate melamine), and metal hydroxides (e.g., magnesium hydroxide), but phosphorus-based and halogen-based flame retardants are preferred. Among phosphorus-based flame retardants, phosphinate metal salts are more preferred. Among halogen-based flame retardants, bromine-based flame retardants are more preferred.

[0067] When using a brominated flame retardant, there is no specific type required, but brominated phthalimide, brominated poly(meth)acrylate, brominated polycarbonate, brominated epoxy, and brominated polystyrene are preferred, with brominated phthalimide being more preferred.

[0068] As the brominated phthalimide, one represented by formula (1) is preferred. [ka] (In equation (1), D represents a group consisting of two or more combinations of alkylene groups, arylene groups, -S(=O)2-, -C(=O)-, and -O-. i is an integer from 1 to 4.)

[0069] In formula (1), D represents a group consisting of two or more combinations of an alkylene group, an arylene group, -S(=O)2-, -C(=O)-, and -O-, with a preferred group consisting of an alkylene group or an arylene group and at least one of -S(=O)2-, -C(=O)-, and -O-, more preferred a group consisting of an alkylene group or an arylene group and one of -S(=O)2-, -C(=O)-, and -O-, and an even more preferred alkylene group. The group consisting of an alkylene group and an -O- group includes, for example, a combination of two alkylene groups and one -O- group (the same applies to other combinations). The alkylene group D is preferably an alkylene group having 1 to 6 carbon atoms, and more preferably a methylene group, ethylene group, propylene group, or butylene group. The arylene group is preferably a phenylene group. i is an integer between 1 and 4, and is preferably 4.

[0070] Examples of brominated phthalimides represented by formula (1) include N,N'-(bistetrabromophthalimide)ethane, N,N'-(bistetrabromophthalimide)propane, N,N'-(bistetrabromophthalimide)butane, N,N'-(bistetrabromophthalimide)diethyl ether, N,N'-(bistetrabromophthalimide)dipropyl ether, N,N'-(bistetrabromophthalimide)dibutyl ether, N,N'-(bistetrabromophthalimide)diphenylsulfone, N,N'-(bistetrabromophthalimide)diphenyl ketone, and N,N'-(bistetrabromophthalimide)diphenyl ether.

[0071] As for the brominated phthalimide, formula (1) is preferably the brominated phthalimide represented by formula (2). [ka] (In equation (2), i is an integer between 1 and 4.) i is an integer between 1 and 4, and is preferably 4.

[0072] The brominated poly(meth)acrylate is preferably a polymer obtained by polymerizing benzyl(meth)acrylate containing bromine atoms alone, copolymerizing two or more types, or copolymerizing with other vinyl monomers. The bromine atoms are attached to the benzene ring, and the number of attached atoms is preferably 1 to 5 per benzene ring, with 4 to 5 being particularly preferred.

[0073] Examples of benzyl acrylates containing a bromine atom include pentabrom benzyl acrylate, tetrabrom benzyl acrylate, tribrom benzyl acrylate, or mixtures thereof. Examples of benzyl methacrylates containing a bromine atom include methacrylates corresponding to the acrylates mentioned above.

[0074] Other vinyl monomers used for copolymerization with benzyl (meth)acrylate containing bromine atoms include, specifically, acrylic acid esters such as acrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, and benzyl acrylate; methacrylic acid esters such as methacrylic acid, methyl methacrylate, ethyl methacrylate, butyl methacrylate, and benzyl methacrylate; unsaturated carboxylic acids or their anhydrides such as styrene, acrylonitrile, fumaric acid, and maleic acid; vinyl acetate, vinyl chloride, and the like.

[0075] These are usually used in amounts equal to or less than equimolar to the benzyl (meth)acrylate containing bromine atoms, and preferably in amounts of 0.5 times the molar amount or less.

[0076] In addition, vinyl monomers such as xylene acrylate, xylene methacrylate, tetrabrom xylene acrylate, tetrabrom xylene methacrylate, butadiene, isoprene, and divinylbenzene can also be used, and these can usually be used in amounts of 0.5 times or less molar relative to benzyl acrylate or benzyl methacrylate which contains bromine atoms.

[0077] The brominated poly(meth)acrylate is preferably a polymer obtained by polymerizing a (meth)acrylate monomer containing bromine atoms, particularly benzyl (meth)acrylate, alone, copolymerizing two or more of them, or copolymerizing them with other vinyl monomers. Furthermore, the bromine atoms are attached to the benzene ring, and the number of attached atoms is preferably 1 to 5 per benzene ring, with 4 to 5 being particularly preferable.

[0078] As the brominated poly(meth)acrylate, pentabromobenzyl poly(meth)acrylate is preferred due to its high bromine content.

[0079] The molecular weight of the brominated poly(meth)acrylate is arbitrary and can be selected and determined as appropriate, but it is preferably 3,000 or more in weight-average molecular weight (Mw), more preferably 10,000 or more, even more preferably 15,000 or more, even more preferably 20,000 or more, and even more preferably 25,000 or more. Setting it above the lower limit tends to yield molded articles with higher mechanical strength. Furthermore, the upper limit of the weight-average molecular weight (Mw) is preferably 100,000 or less, more preferably 80,000 or less, even more preferably 60,000 or less, even more preferably 50,000 or less, and even more preferably 35,000 or less. Setting it below the upper limit tends to further improve the fluidity of the resin composition.

[0080] The brominated polycarbonate preferably has a free bromine content of 0.05% by mass or more, and more preferably 0.20% by mass or less. This range tends to further improve the heat resistance stability of the resin composition. The brominated polycarbonate also preferably has a chlorine atom content of 0.001% by mass or more, and more preferably 0.20% by mass or less. This range tends to further improve mold corrosion resistance during molding. The brominated polycarbonate is preferably, for example, a brominated polycarbonate obtained from brominated bisphenol A, particularly tetrabromobisphenol A. Its terminal structure may include a phenyl group, a 4-t-butylphenyl group, or a 2,4,6-tribromophenyl group, with a 2,4,6-tribromophenyl group being particularly preferred.

[0081] The average number of carbonate constituent units in brominated polycarbonate can be appropriately selected and determined, but it is preferably 2 to 30, more preferably 3 to 15, and even more preferably 3 to 10.

[0082] The molecular weight of the brominated polycarbonate is arbitrary and can be selected and determined as appropriate, but preferably, the viscosity-average molecular weight is 1,000 to 20,000, and more preferably, 2,000 to 10,000.

[0083] The brominated polycarbonate obtained from the above-mentioned brominated bisphenol A can be obtained, for example, by a conventional method of reacting brominated bisphenol with phosgene. Examples of end-capping agents include aromatic monohydroxy compounds, which may be substituted with halogens or organic groups.

[0084] As brominated epoxy compounds, preferred examples include bisphenol A type brominated epoxy compounds, such as tetrabromobisphenol A epoxy compounds and glycidyl brominated bisphenol A epoxy compounds.

[0085] The molecular weight of the brominated epoxy compound is arbitrary and can be selected and determined as appropriate, but it is preferably 3,000 or more in weight-average molecular weight (Mw), more preferably 10,000 or more, even more preferably 13,000 or more, even more preferably 15,000 or more, and even more preferably 18,000 or more. Setting it above the lower limit tends to yield molded articles with higher mechanical strength. Furthermore, the upper limit of the weight-average molecular weight (Mw) is preferably 100,000 or less, more preferably 80,000 or less, even more preferably 78,000 or less, even more preferably 75,000 or less, and even more preferably 70,000 or less. Setting it below the upper limit tends to further improve the fluidity of the resin composition. The brominated epoxy compound preferably has an epoxy equivalent of 3,000 to 40,000 g / eq, more preferably 4,000 to 35,000 g / eq, and particularly preferably 10,000 to 30,000 g / eq.

[0086] Furthermore, brominated epoxy oligomers can also be used in combination as brominated epoxy. In this case, for example, by using oligomers with an Mw of 5,000 or less in a proportion of about 50% by mass or less, flame retardancy, mold release properties, and fluidity can be appropriately adjusted. The bromine atom content in the brominated epoxy compound is arbitrary, but in order to impart sufficient flame retardancy, it is usually 10% by mass or more, more preferably 20% by mass or more, and especially preferably 30% by mass or more, with an upper limit of 60% by mass, and more preferably 55% by mass or less.

[0087] Preferably, the brominated polystyrene is a brominated polystyrene containing the constituent unit shown in formula (3). [ka] (In equation (3), t is an integer between 1 and 5, and n is the number of constituent units.)

[0088] Brominated polystyrene may be produced by either brominating polystyrene or by polymerizing brominated styrene monomer, but polymerized brominated styrene is preferred because it contains a small amount of free bromine (atoms). In formula (3), the CH group to which brominated benzene is bonded may be substituted with a methyl group. Brominated polystyrene may also be a copolymer obtained by copolymerizing other vinyl monomers. Examples of vinyl monomers in this case include styrene, α-methylstyrene, (meth)acrylonitrile, methyl (meth)acrylate, butadiene, and vinyl acetate. Brominated polystyrene may also be used as a single substance or a mixture of two or more substances with different structures, and may contain units derived from styrene monomers with different numbers of bromine atoms in a single molecular chain.

[0089] Specific examples of brominated polystyrene include, for example, poly(4-bromostyrene), poly(2-bromostyrene), poly(3-bromostyrene), poly(2,4-dibromostyrene), poly(2,6-dibromostyrene), poly(2,5-dibromostyrene), poly(3,5-dibromostyrene), poly(2,4,6-tribromostyrene), poly(2,4,5-tribromostyrene), poly(2,3,5-tribromostyrene), and poly(4-bromo-α-methylstyrene). Examples include poly(2,4-dibromo-α-methylstyrene), poly(2,5-dibromo-α-methylstyrene), poly(2,4,6-tribromo-α-methylstyrene), and poly(2,4,5-tribromo-α-methylstyrene), with poly(2,4,6-tribromostyrene), poly(2,4,5-tribromostyrene), and polydibromostyrene and polytribromostyrene containing an average of 2 to 3 bromine groups in the benzene ring being particularly preferred.

[0090] The brominated polystyrene preferably has an average degree of polymerization (n) of 30 to 1,500, more preferably 150 to 1,000, and particularly preferably 300 to 800. If the average degree of polymerization is less than 30, blooming is likely to occur, while if it exceeds 1,500, dispersion problems are likely to occur, and mechanical properties tend to deteriorate. Furthermore, the weight-average molecular weight (Mw) of the brominated polystyrene is preferably 5,000 to 500,000, more preferably 10,000 to 500,000, even more preferably 10,000 to 300,000, even more preferably 10,000 to 100,000, and even more preferably 10,000 to 70,000. In particular, for the brominated polystyrene mentioned above, the weight-average molecular weight (Mw) is preferably 50,000 to 70,000, and for brominated polystyrene produced by polymerization, the weight-average molecular weight (Mw) is preferably around 10,000 to 30,000. The weight-average molecular weight (Mw) can be determined as a value converted to standard polystyrene by GPC measurement.

[0091] The bromine concentration in the brominated flame retardant is preferably 45% by mass or more, more preferably 48% by mass or more, and even more preferably 50% by mass or more. Setting it above the lower limit tends to effectively improve the flame retardancy of the molded article. The upper limit of the bromine concentration is preferably 75% by mass or less, more preferably 73% by mass or less, and even more preferably 71% by mass or less.

[0092] When using a phosphinate metal salt as a flame retardant, there are no specific requirements regarding its type, but it is preferable that the phosphinate metal salt has an anion portion represented by formula (4) or (5), and the cation portion is composed of one of the following metal ions: calcium, magnesium, aluminum, or zinc.

[0093] [ka] (In the formula, R 1 and R 2 Each of these independently represents an alkyl group having 1 to 6 carbon atoms or an aryl group which may have substituents, and R 1 They may be the same or different, R 3 R represents an alkylene group having 1 to 10 carbon atoms, an arylene group which may have substituents, or a group consisting of a combination thereof. 3 The terms can be identical or different, and n represents an integer between 0 and 2. The optionally substituted aryl group is preferably an optionally substituted phenyl group. If substituted, an alkyl group having 1 to 3 carbon atoms is preferred. It is also preferable that the group be unsubstituted. The optionally substituted arylene group is preferably an optionally substituted phenylene group. The optionally substituted arylene group is preferably unsubstituted or has a C1-C3 alkyl group (preferably a methyl group) as a substituent. In this embodiment, a metal phosphinate represented by formula (5) is preferred. In this embodiment, aluminum phosphinate is also preferred.

[0094] Specific examples of phosphinate metal salts include calcium dimethylphosphinate, magnesium dimethylphosphinate, aluminum dimethylphosphinate, zinc dimethylphosphinate, calcium ethylmethylphosphinate, magnesium ethylmethylphosphinate, aluminum ethylmethylphosphinate, zinc ethylmethylphosphinate, calcium diethylphosphinate, magnesium diethylphosphinate, aluminum diethylphosphinate, zinc diethylphosphinate, calcium methyl-n-propylphosphinate, magnesium methyl-n-propylphosphinate, aluminum methyl-n-propylphosphinate, zinc methyl-n-propylphosphinate, calcium methanedi(methylphosphinate), Examples include magnesium methanedi(methylphosphinate), aluminum methanebis(methylphosphinate), zinc methanebis(methylphosphinate), calcium benzene-1,4-bis(methylphosphinate), magnesium benzene-1,4-bis(methylphosphinate), aluminum benzene-1,4-bis(methylphosphinate), zinc benzene-1,4-bis(methylphosphinate), calcium methylphenylphosphinate, magnesium methylphenylphosphinate, aluminum methylphenylphosphinate, zinc methylphenylphosphinate, calcium diphenylphosphinate, magnesium diphenylphosphinate, aluminum diphenylphosphinate, and zinc diphenylphosphinate. Details of phosphinate metal salts can be found in paragraphs 0052-0058 of International Publication No. 2010 / 010669, which are incorporated herein by reference.

[0095] If the resin composition of this embodiment contains a flame retardant, the lower limit of its content is preferably 1 part by mass or more, more preferably 3 parts by mass or more, even more preferably 5 parts by mass or more, even more preferably 7 parts by mass or more, even more preferably 10 parts by mass or more, and may be 15 parts by mass or more, based on 100 parts by mass of the total of polyester resin (A) and amorphous resin (B). Setting the content above the lower limit tends to further improve the flame retardancy of the resulting molded article. The upper limit of the flame retardant content is preferably 70 parts by mass or less, more preferably 60 parts by mass or less, even more preferably 50 parts by mass or less, even more preferably 45 parts by mass or less, even more preferably 40 parts by mass or less, and even more preferably 30 parts by mass or less, based on 100 parts by mass of the total of polyester resin (A) and amorphous resin (B). Setting the content below the upper limit can more effectively suppress the decrease in the mechanical strength of the resulting molded article. The resin composition of this embodiment may contain only one type of flame retardant, or it may contain two or more types. When it contains two or more types, it is preferable that the total amount is within the above range.

[0096] <<Flame retardant additive>> The resin composition of this embodiment may contain a flame retardant additive. Including a flame retardant additive can further improve the flame retardancy of the molded article. The flame retardant additive is particularly preferably used when a halogen-based flame retardant is included. Examples of flame retardant additives used in this embodiment include antimony compounds, such as antimony trioxide (Sb2O3), antimony pentoxide (Sb2O5), and sodium antimonate. Antimony oxide, and especially antimony trioxide, is particularly preferred from the viewpoint of impact resistance. When a flame retardant is included, it may be included as a masterbatch. The antimony compound content in the masterbatch is preferably 30 to 90% by mass, more preferably 40 to 85% by mass, and even more preferably 50 to 85% by mass.

[0097] If the resin composition of this embodiment contains a flame retardant additive (e.g., an antimony compound), its content is preferably 0.1 parts by mass or more, more preferably 0.5 parts by mass or more, and even more preferably 1 part by mass or more, based on 100 parts by mass of the total of the polyester resin (A) and the amorphous resin (B). Setting the content above the lower limit tends to more effectively exhibit flame retardancy. Furthermore, the upper limit of the antimony compound content is preferably 7 parts by mass or less, more preferably 5 parts by mass or less, and even more preferably 3 parts by mass or less, based on 100 parts by mass of the total of the polyester resin (A) and the amorphous resin (B). Setting the content below the upper limit tends to improve the release properties and impact resistance of the resulting molded product. The resin composition of this embodiment may contain only one flame retardant (e.g., an antimony compound) or two or more. When two or more are included, it is preferable that the total amount is within the above range. The resin composition of this embodiment may contain only one flame retardant (e.g., an antimony compound) or two or more. When two or more are included, it is preferable that the total amount is within the above range.

[0098] In the resin composition of this embodiment, the antimony content is preferably 0 parts by mass or more per 100 parts by mass of the total of the polyester resin (A) and the amorphous resin (B). Furthermore, the upper limit of the antimony compound content is preferably 5 parts by mass or less, more preferably 3 parts by mass or less, even more preferably 1 part by mass or less, and even more preferably 0.5 parts by mass or less, per 100 parts by mass of the total of the polyester resin (A) and the amorphous resin (B). By keeping the content below the upper limit, the release properties and impact resistance of the resulting molded product tend to improve.

[0099] <<Drip-preventing agent>> The resin composition in this embodiment may contain an anti-dripping agent. A fluoropolymer is preferred as the anti-dripping agent. Any known polymer containing fluorine can be arbitrarily selected and used as the fluoropolymer, but fluoroolefin resins are particularly preferred. Examples of fluoroolefin resins include polymers and copolymers containing a fluoroethylene structure. Specific examples include difluoroethylene resins, tetrafluoroethylene resins, and tetrafluoroethylene / hexafluoropropylene copolymer resins. Among these, tetrafluoroethylene resins are preferred. Among these fluoroethylene resins, fluoroethylene resins having fibril-forming ability are preferred. Examples of fluoroethylene resins that have fibril-forming ability include Teflon® 6J from Mitsui DuPont Fluorochemicals, Polyflon® F201L and Polyflon® F103 from Daikin Industries, Ltd.

[0100] Furthermore, examples of aqueous dispersions of fluoroethylene resins include Teflon® 30J from Mitsui DuPont Fluorochemicals, Fluon D-1 and M12 from Daikin Industries, and TF1750 from Sumitomo 3M. In addition, fluoroethylene polymers having a multilayer structure formed by polymerizing vinyl monomers can also be used as fluoropolymers. A specific example of this is Metabrane® A-3800 from Mitsubishi Chemical Corporation.

[0101] If the resin composition in this embodiment contains an anti-dripping agent, its content is preferably 0.01 parts by mass or more, more preferably 0.05 parts by mass or more, even more preferably 0.1 parts by mass or more, and even more preferably 0.2 parts by mass or more, based on 100 parts by mass of the total of the polyester resin (A) and amorphous resin (B). Setting the content above the lower limit tends to further improve the flammability of the molded product formed from the resin composition. As for the upper limit, it is preferably 3 parts by mass or less, more preferably 2 parts by mass or less, and even more preferably 1 part by mass or less, based on 100 parts by mass of the total of the polyester resin (A) and amorphous resin (B). Setting the content below the upper limit tends to further improve the adhesion of the molded product formed from the resin composition. The resin composition in this embodiment may contain only one type of anti-dripping agent, or it may contain two or more types. If it contains two or more types, it is preferable that the total amount is within the above range.

[0102] <<Stabilizer>> The resin composition of this embodiment may contain a stabilizer. Examples of stabilizers include hindered phenol compounds, hindered amine compounds, phosphorus compounds, and sulfur-based stabilizers. Among these, hindered phenol compounds are preferred. It is also preferable to use a combination of hindered phenol compounds and phosphorus compounds. Specifically, as stabilizers, reference can be made to paragraphs 0046-0057 of Japanese Patent Publication No. 2018-070722, paragraphs 0030-0037 of Japanese Patent Publication No. 2019-056035, and paragraphs 0066-0078 of International Publication No. 2017 / 038949, the contents of which are incorporated herein by reference.

[0103] The resin composition of this embodiment preferably contains a stabilizer in an amount of 0.01 parts by mass or more, more preferably 0.05 parts by mass or more, and even more preferably 0.08 parts by mass or more, per 100 parts by mass of the total of the polyester resin (A) and the amorphous resin (B). Furthermore, the upper limit of the stabilizer content is preferably 3 parts by mass or less, more preferably 2 parts by mass or less, and even more preferably 1 part by mass or less, per 100 parts by mass of the total of the polyester resin (A) and the amorphous resin (B). The resin composition of this embodiment may contain only one stabilizer or two or more stabilizers. When two or more stabilizers are included, it is preferable that the total amount is within the above range.

[0104] <<Release agent>> The resin composition of this embodiment preferably contains a mold release agent. A wide range of known release agents can be used as the release agent, with aliphatic carboxylic acid esters, paraffin wax, polystyrene wax, and polyolefin wax being preferred, and polyethylene wax being more preferred. Specifically, as a mold release agent, reference can be given to the descriptions in paragraphs 0115 to 0120 of Japanese Patent Publication No. 2013-007058, paragraphs 0063 to 0077 of Japanese Patent Publication No. 2018-070722, and paragraphs 0090 to 0098 of Japanese Patent Publication No. 2019-123809, the contents of which are incorporated herein by reference.

[0105] The resin composition of this embodiment preferably contains 0.01 parts by mass or more, more preferably 0.1 parts by mass or more, and even more preferably 0.5 parts by mass or more, of the mold release agent per 100 parts by mass of the total of the polyester resin (A) and the amorphous resin (B). Furthermore, the upper limit of the mold release agent content is preferably 5 parts by mass or less, more preferably 3 parts by mass or less, and even more preferably 2 parts by mass or less, per 100 parts by mass of the total of the polyester resin (A) and the amorphous resin (B). The resin composition may contain only one type of release agent or two or more types. If it contains two or more types, it is preferable that the total amount is within the above range.

[0106] <<Reactive Compounds>> The resin composition of this embodiment may further contain a reactive compound (preferably an epoxy compound). The inclusion of a reactive compound tends to further improve adhesion. The reactive compound is preferably a compound that chemically reacts with carboxyl groups or hydroxyl groups present at the ends of the polyester resin (A), potentially causing crosslinking or chain lengthening. The reactive compound preferably includes one or more selected from the group consisting of epoxy compounds, carbodiimide compounds, compounds having an oxazoline group (ring), compounds having an oxazine group (ring), compounds having a carboxyl group, and compounds having an amide group. It is more preferably included at least one selected from epoxy compounds and carbodiimide compounds, and even more preferably includes an epoxy compound. In particular, it is preferable that the resin composition of this embodiment contains 90% by mass or more, more preferably 95% by mass or more, and especially 99% by mass or more of the reactive compound as an epoxy compound. The epoxy compound is not specifically defined as any compound having one or more epoxy groups in one molecule; a wide range of known epoxy compounds can be used.

[0107] Examples of epoxy compounds include glycidyl compounds, epoxy compounds having aromatic rings, and alicyclic epoxy compounds, and it is preferable that the epoxy compound contains at least one epoxy compound having an aromatic ring.

[0108] Specific examples of epoxy compounds include bisphenol A type epoxy compounds (including bisphenol A diglycidyl ether), bisphenol F type epoxy compounds (including bisphenol F diglycidyl ether), biphenyl type epoxy compounds (including bis(glycidyloxy)biphenyl), resorcinol type epoxy compounds (including resorcinol diglycidyl ether), novolac type epoxy compounds, epoxy compounds having aromatic rings such as glycidyl benzoate, diglycidyl terephthalate, and diglycidyl orthophthalate, methyl glycidyl ether, butyl glycidyl ether, 2-ethylhexyl glycidyl ether, decyl glycidyl ether, and s Examples include (di)glycidyl ethers such as tearyl glycidyl ether, phenyl glycidyl ether, butylphenyl glycidyl ether, allyl glycidyl ether, neopentyl glycol diglycidyl ether, ethylene glycol diglycidyl ether, glycerin diglycidyl ether, and propylene glycol diglycidyl ether; paraffinic (e.g., saturated fatty acid) or olefinic (e.g., unsaturated fatty acid) (di)glycidyl esters such as glycidyl sorbate, diglycidyl adipic acid, epoxidized linseed oil, and epoxidized soybean oil; and alicyclic epoxy compounds such as vinylcyclohexene dioxide and dicyclopentadiene oxide. Among these, bisphenol A type epoxy compounds, novolac type epoxy compounds, bisphenol F type epoxy compounds, and biphenyl type epoxy compounds are preferred, and orthocresol / novolac type epoxy resins (polyglycidyl ether compounds of O-cresol-formaldehyde polycondensates) are particularly preferred. Commercially available options include "Joncryl ADR4368C" (product name: manufactured by BASF), Epicote 1003 (product name: manufactured by Mitsubishi Chemical Corporation), and YDCN-704 (manufactured by Nippon Steel Chemical & Material Co., Ltd.).

[0109] The epoxy compound preferably has a weight-average molecular weight of 15,000 or less, and more preferably 10,000 or less. While there is no specific lower limit, it is preferably 100 or more, and more preferably 500 or more. By using this range, the effects of this embodiment tend to be more effectively exhibited.

[0110] The epoxy compound preferably has an epoxy equivalent of 100 g / eq or more or 100 g / mol or more, more preferably 150 g / eq or more or 150 g / mol or more. Furthermore, the epoxy compound preferably has an epoxy equivalent of 1500 g / eq or 1500 g / mol or less, more preferably 900 g / eq or 900 g / mol or less, and even more preferably 800 g / eq or 800 g / mol or less. By setting the epoxy equivalent above the lower limit, fluidity tends to increase, making the resin composition easier to mold. By setting it below the upper limit, adhesion to other components tends to improve.

[0111] If the resin composition of this embodiment contains a reactive compound (preferably an epoxy compound), its content is preferably 0.1 parts by mass or more per 100 parts by mass of the total of the polyester resin (A) and the amorphous resin (B). Setting it above the lower limit tends to increase adhesive strength and mechanical strength. Furthermore, the upper limit of the reactive compound content is preferably 18 parts by mass or less, more preferably 15 parts by mass or less, even more preferably 10 parts by mass or less, even more preferably 5 parts by mass or less, and even more preferably 3 parts by mass or less, per 100 parts by mass of the total of the polyester resin (A) and the amorphous resin (B). Setting it below the upper limit tends to increase fluidity and improve moldability. The resin composition of this embodiment may contain only one reactive compound or two or more. When it contains two or more, it is preferable that the total amount is within the above range.

[0112] <<Coloring agent>> The molded article of the present invention may contain a coloring agent. The coloring agent may be a pigment or a dye, but a pigment is preferred. Carbon black is an example of a coloring agent that can be used in this embodiment. Details of carbon black can be found in paragraph 0021 of Japanese Patent Application Publication No. 2011-57977, and these details are incorporated herein. Furthermore, when a coloring agent such as carbon black is incorporated into the resin composition of this embodiment, it is preferable to form a masterbatch and then knead it with the polyester resin (A) and the amorphous resin (B). A polyester resin is preferably used for the masterbatch, and a polybutylene terephthalate resin is more preferably used. If the resin composition of this embodiment contains a colorant, its content is preferably 0.05 parts by mass or more, more preferably 0.1 parts by mass or more, more preferably 10 parts by mass, more preferably 5 parts by mass or less, and even more preferably 3 parts by mass, based on 100 parts by mass of the total of the polyester resin (A) and amorphous resin (B). The resin composition of this embodiment may contain only one coloring agent or two or more coloring agents. When two or more coloring agents are included, it is preferable that the total amount is within the above range.

[0113] <Uses of resin compositions> The resin composition of this embodiment preferably has high adhesion to other components and is preferably used for bonding to other components.

[0114] <Method for producing resin compositions> There are no limitations on the method for manufacturing the resin composition in this embodiment, and a wide range of known methods for manufacturing resin compositions can be employed. For example, a method may be used in which the polyester resin (A) and amorphous resin (B), as well as other components to be added as needed, are pre-mixed using various mixers such as a tumbler or a Henschel mixer, and then melt-kneaded using a mixer such as a Banbury mixer, roll, braver, single-screw extruder, twin-screw extruder, or kneader. The melt-kneading temperature is not particularly limited, but is usually in the range of 220 to 320°C.

[0115] <Molded products> The resin composition described above (for example, pellets) is molded into a molded product by various molding methods. That is, the molded product of this embodiment is formed from the resin composition or pellets of this embodiment, as described above. There are no particular restrictions on the shape of the molded product, and it can be appropriately selected according to the use and purpose of the molded product. Examples include film-shaped, rod-shaped, cylindrical, annular, circular, elliptical, polygonal, irregularly shaped, hollow, frame-shaped, box-shaped, panel-shaped, and button-shaped products. Among these, film-shaped, frame-shaped, panel-shaped, and button-shaped products are preferred, and the thickness is, for example, about 1 mm to 5 mm in the case of frame-shaped and panel-shaped products.

[0116] The method for molding the molded product is not particularly limited, and conventionally known molding methods can be used. Examples include injection molding, injection compression molding, extrusion molding, shape extrusion, transfer molding, hollow molding, gas-assisted hollow molding, blow molding, extrusion blow molding, IMC (in-mold coating) molding, rotational molding, multilayer molding, two-color molding, insert molding, sandwich molding, foam molding, and pressure molding. In particular, the resin composition in this embodiment is suitable for molded products obtained by injection molding, injection compression molding, and extrusion molding. When performing mold molding, such as injection molding, the mold temperature is preferably 40 to 130°C. If the mold temperature is low, the arithmetic mean height increases, and the adhesive strength tends to improve, but the appearance deteriorates. If the mold temperature is high, the arithmetic mean height decreases, and the appearance improves, but the adhesive strength tends to decrease. The mold temperature is preferably around 60 to 100°C, and within this range, both adhesive strength and appearance can be effectively improved. However, it goes without saying that the resin compositions in this embodiment are not limited to the molded articles obtained therefrom.

[0117] <Multilayer body> The multilayer body of this embodiment comprises a molded article of this embodiment (a molded article formed from the resin composition or pellets of this embodiment) and other members that are bonded directly to it, or at least via an adhesive. It is presumed that by adjusting the amount of acid in the resin composition, a multilayer body with excellent adhesion between the molded product obtained from the resin composition and other components can be obtained. Here, the molded product and the other component may be directly bonded together, or they may be bonded together at least via an adhesive. That is, because the molded product has excellent adhesive properties, it can be bonded to the other component itself without any adhesive. Furthermore, even when the molded product and the other component are bonded together at least via an adhesive, there are advantages such as the fact that they can be bonded sufficiently even without providing a primer layer. That is, the molded product and the other component may be bonded together using only an adhesive. Of course, the molded product and the other component may also be bonded together using a primer layer and an adhesive. The first embodiment of this model is a multilayer body in which a molded product and other components are directly bonded together in part. For example, the other components may be encapsulants or coatings (including paints and coatings) such as epoxy resin or silicone rubber. More specifically, the multilayer body of the first embodiment may be a multilayer body in which an encapsulant such as epoxy resin or silicone rubber is provided on the surface of a molded product, or a multilayer body in which a coating agent (including paints and coatings) is provided on the surface of a molded product. Furthermore, the multilayer body in this model may be a molded product made by a die molding method, and among these, it may be made by compression molding or transfer molding, or it may be a molded product made by welding, or it may be a multilayer body or molded product made by applying multiple liquids to the surface of a molded product, allowing them to react and harden. A second embodiment of this embodiment is a multilayer in which the multilayer further includes an adhesive, and the molded article and other components are bonded together at least via the adhesive. Examples include a multilayer in which a molded article formed from the resin composition of this embodiment is bonded to a component formed from metal with an adhesive, a multilayer in which a molded article formed from the resin composition of this embodiment is bonded to a component formed from glass with an adhesive, and a multilayer in which a molded article formed from the resin composition of this embodiment is bonded to a component formed from the resin composition of this embodiment or another resin composition with an adhesive. Furthermore, a multilayer may be in which a molded article formed from the resin composition of this embodiment is bonded to other components with a primer layer and an adhesive.

[0118] The molded articles, multilayers, or molded bodies in this embodiment are suitably used in electrical and electronic equipment, office automation equipment, portable information terminals, machine parts, home appliances, vehicle parts, various containers, lighting equipment, displays, and other components. Among these, they are particularly suitable for use in vehicle parts. In this embodiment, the molded body includes multilayers and may be either a component or a finished product. As described above, the molded product in this embodiment exhibits excellent adhesion to adhesives, sealants, decorative agents, coating agents (including paints and coatings), and other components. Therefore, it is preferably used in applications such as multilayer structures where the molded product is bonded to other components using adhesives, or in applications where the molded product is sealed, decorated, or coated using sealants, decorative agents, or coating agents. As mentioned above, "other components" refers to components made from thermoplastic resins, thermosetting resins, metals, glass, etc. Specifically, it is preferably used in ignition cases, sensor housings, ECU housings, fuel caps, window regulators, automotive connectors, relay cases, motor cases, brackets, various cases, various tubes, and the like.

[0119] An adhesive is a substance used to bond two objects together, and is usually not thermoplastic. It is preferable that the adhesive forms a layered structure (adhesive layer). The thickness of the adhesive layer is preferably 0.01 μm or more, more preferably 0.1 μm or more, and preferably 10,000 μm or less, and more preferably 5,000 μm or less. Examples of the adhesives mentioned above include silicone-based adhesives, modified silicone-based adhesives, epoxy-based adhesives, acrylic-based adhesives, urethane-based adhesives, and polyester-based adhesives. Only one type of adhesive may be used, or two or more types may be mixed and used.

[0120] The undercoat layer is a layer for further improving the adhesion between the adhesive and the molded product or other component, and the undercoat layer may be provided between the adhesive and the molded product or other component. The material used to form the undercoat layer can be referenced from Japanese Patent Application Publication No. 2022-123848, and this information is incorporated herein by reference.

[0121] Furthermore, as the sealing agent, sealing agents, sealing compositions, or sealing methods described in Japanese Patent Publication No. 2021-080363, Japanese Patent Publication No. 2014-062224, Japanese Patent Publication No. Hei 10-305444, Japanese Patent Publication No. 2011-018859, Japanese Patent Publication No. 2001-247746, and Japanese Patent Publication No. 2009-029842 can be suitably used, and the contents of these publications are incorporated herein by reference.

[0122] The following are specific examples of preferred configurations of the multilayer body according to this embodiment. It goes without saying that the multilayer body according to this embodiment is not limited to these examples. (1) A multilayer body having a molded article formed from a resin composition and other members, wherein the molded article and the other members are directly bonded together in part. (2) A multilayer having a molded article formed from a resin composition, an adhesive, and other components, wherein the molded article and the other components are bonded together via the adhesive. (3) A multilayer body comprising a molded article formed from a resin composition, a primer layer, an adhesive, and other components, wherein the primer layer is provided on at least a portion of the surface of the molded article, and the primer layer and the other components are bonded together via an adhesive. (4) A multilayer body comprising a molded article formed from a resin composition, an adhesive, a primer layer, and other members, wherein the primer layer is provided on at least a portion of the surface of the other members, and the primer layer and the molded article are bonded together via an adhesive.

[0123] It should be noted that the multilayer structure of this embodiment does not necessarily require each layer to be in the form of a flat plate, sheet, etc., and it goes without saying that it also includes, for example, an injection-molded product formed from the resin composition of this embodiment and an injection-molded product as another component bonded together with an adhesive. [Examples]

[0124] The present invention will be described in more detail below with reference to examples. The materials, amounts used, proportions, processing content, and processing procedures shown in the following examples can be modified as appropriate, as long as they do not depart from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below. If the measuring instruments used in the examples are difficult to obtain due to discontinuation or other reasons, measurements can be taken using other instruments with equivalent performance.

[0125] 1.Raw materials The following ingredients were used. [Table 1]

[0126] [Table 2]

[0127] <MVR of amorphous resin (B)> The MVR of amorphous resin (B) was measured in accordance with ISO 1133 standards, under the temperature and load conditions listed in Table 1. A melt indexer manufactured by Takara Industries Co., Ltd. was used for the measurement.

[0128] <Surface free energy> The surface free energies of amorphous resin (B) and other styrene-based resins were measured as follows. The contact angles of two liquids with known surface tensions (purified water and diiodomethane) were measured, and the surface free energy γs was determined using the following formula. The results are shown in Table 3.

number

[0129] [Table 3]

[0130] 2. Examples 1-5, Comparative Examples 1, 2 <Compound> From the components shown in Table 1 or Table 2 above, the components excluding glass fibers were uniformly mixed in the proportions shown in Table 4 (all parts by mass) using a tumbler mixer. Then, using a twin-screw extruder (TEX30α, manufactured by Japan Steel Works, Ltd., L / D=42), with glass fibers supplied from a side feeder, the resin composition was melt-kneaded under the conditions of a cylinder setting temperature of 260°C, a discharge rate of 40 kg / h, and a screw rotation speed of 200 rpm. The resulting resin composition was rapidly cooled in a water bath and pelletized using a pelletizer to obtain pellets of the resin composition.

[0131] <Method for measuring the acid content in a resin composition> The acid content in the resin composition was calculated from the acid content (e.g., maleic anhydride) in the raw material (e.g., maleic anhydride polymer). Specifically, it was calculated by multiplying the acid-modified polymer content by the acid content in the polymer, based on 100% by mass of the resin composition including all additives. The unit is expressed in mass%.

[0132] <Adhesion Test> After drying the pellets obtained above at 120°C for 5 hours, ISO multipurpose test specimens (4 mm thick) were injection molded using a Japan Steel Works injection molding machine (clamping force 85T) under the conditions of cylinder temperature 250°C and mold temperature 80°C. Two of the above ISO multipurpose test specimens (4 mm thick) were prepared. As shown in Figure 1, a fluoropolymer tape 2 (Nitto Corporation, NITOFLON adhesive tape, 0.18 × 10 × 10 mm) was attached to the chuck portion of one of the ISO multipurpose test specimens 1. Next, an adhesive (modified silicone adhesive (one-component, room-temperature curing adhesive mainly composed of modified silicone polymer)) was applied so that the adhesive application area was 20 mm × 20 mm × 0.18 mm thick, and after bonding it to the other ISO multipurpose test specimen 4 (4 mm thick), it was fixed with a binder clip, and the adhesive was treated under the specified curing conditions to bond it. ISO multipurpose test specimens 1-4 were subjected to tensile testing using a Tensilon 1t machine, under tension at 5 mm / min in the direction of the arrow shown in Figure 1. Spacers were used to ensure the specimens were vertical during the tensile testing. The adhesive strength was calculated as the average of three measurements, and its unit is expressed in Newtons (N). Furthermore, the interface condition after bonding was checked and described as follows. If adhesive failure occurs after testing: cohesive failure If delamination occurs at the adhesive-resin interface after testing: Interfacial delamination

[0133] [Table 4]

[0134] As is clear from the above results, molded articles formed from the resin composition of the present invention exhibited excellent adhesive properties. In particular, in the above examples, sufficient adhesive strength was observed even when using a modified silicone adhesive, which is said to have poor compatibility with polybutylene terephthalate resin.

[0135] Although the present invention has been described in detail using specific embodiments, it will be apparent to those skilled in the art that various modifications are possible without departing from the intent and scope of the invention. [Explanation of Symbols]

[0136] 1 ISO multipurpose test specimen 2. Fluorine-based resin tape 3. Adhesive 4 ISO multipurpose test specimens

Claims

1. It contains polyester resin (A) and amorphous resin (B), The mass ratio of the polyester resin (A) to the amorphous resin (B) is 10 / 90 to 90 / 10. A resin composition wherein the ratio of the polar component to the total surface free energy of the amorphous resin (B) is 2.0 or greater.

2. The surface free energy of the polar component of the amorphous resin (B) is 0.8 mJ / m ２ The resin composition according to claim 1.

3. The resin composition according to claim 1 or 2, wherein the amorphous resin (B) includes a styrene-based resin.

4. The resin composition according to claim 1 or 2, wherein the amorphous resin (B) contains acrylonitrile units.

5. A resin composition according to claim 1 or 2, used for bonding with other components.

6. The surface free energy of the polar component of the amorphous resin (B) is 0.8 mJ / m ２ And, The amorphous resin (B) includes a styrene-based resin, The amorphous resin (B) contains acrylonitrile units, The resin composition according to claim 1, used for bonding with other components.

7. A molded article formed from the resin composition according to claim 1, 2, or 6.

8. A multilayer body having a molded article according to claim 7 and other members bonded directly to it, or at least via an adhesive.

9. Pellets of the resin composition according to claim 1, 2, or 6.

10. A molded article formed from the pellets described in claim 9.

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