JP2023081377A - Fluidity improver and resin composition - Google Patents

Abstract

To provide a novel fluidity improver capable of providing a polycarbonate resin composition which has excellent fluidity and a molding of which has excellent strength, color tone and transparency.SOLUTION: A fluidity improver for a polycarbonate resin comprises a polyester-polyether glycol copolymer comprising an aromatic polyester unit and a polyether glycol unit, wherein the polyether glycol unit comprises a specific constitutional unit and does not comprise aromatic groups.SELECTED DRAWING: None

Description

The present invention relates to flow improvers and resin compositions.

Polycarbonate-based resins are known as resins having the highest impact resistance among engineering plastics. Therefore, polycarbonate-based resins are used in various fields by taking advantage of these characteristics. However, polycarbonate-based resins have drawbacks such as poor moldability.

On the other hand, thermoplastic polyesters are excellent in moldability, but have the drawback of being inferior in impact resistance.

Various resin compositions have been proposed for the purpose of taking advantage of the characteristics of each material and compensating for the drawbacks. For example, attempts have been made to simultaneously satisfy the impact resistance and moldability required for automobile parts and the like.

For example, Patent Document 1 discloses a resin composition containing a polycarbonate-based resin and a polyester-polyether copolymer as a base resin, wherein the polyester-polyether copolymer comprises an aromatic polyester unit and an aromatic A resin composition is disclosed which is a copolymer composed of modified polyether units containing a group group.

WO2013/162043

However, the conventional techniques as described above have room for further improvement from the viewpoint of the fluidity of the polycarbonate-based resin composition, and the strength, color tone, and transparency of the molded article formed by molding the polycarbonate-based resin composition. was there.

One embodiment of the present invention has been made in view of the above problems, and the object thereof is to provide a molded article having excellent strength, color tone and transparency, and to provide a polycarbonate resin composition having excellent fluidity. An object of the present invention is to provide a novel fluidity improver and related technology.

The present inventors have completed the present invention as a result of intensive studies to solve the above problems.

A flow improver according to one embodiment of the present invention comprises a polyester-polyether glycol copolymer having aromatic polyester units and polyether glycol units, said polyether glycol units being polypentamethylene ether glycol units, A fluidity improver for polycarbonate resins containing at least one selected from the group consisting of polytetramethylene ether glycol units, polypropylene glycol units, polyethylene glycol units and polyoxymethylene units and containing no aromatic group. be.

In the resin composition according to one embodiment of the present invention, the polyester-polyether glycol copolymer has an aromatic polyester unit and a polyether glycol unit, and the polyether glycol unit is a polypentamethylene ether glycol unit. , polytetramethylene ether glycol units, polypropylene glycol units, polyethylene glycol units and polyoxymethylene units, and does not contain an aromatic group.

According to one aspect of the present invention, a novel fluidity improver capable of providing a molded article having excellent strength, color tone and transparency and providing a polycarbonate resin composition having excellent fluidity, and related technology are provided. can do.

An embodiment of the invention will be described below, but the invention is not limited thereto. The present invention is not limited to each configuration described below, and various modifications are possible within the scope of the claims. Further, embodiments or examples obtained by appropriately combining technical means disclosed in different embodiments or examples are also included in the technical scope of the present invention. Furthermore, new technical features can be formed by combining the technical means disclosed in each embodiment. In addition, all the scientific literatures and patent documents described in this specification are used as references in this specification. In addition, unless otherwise specified in this specification, "A to B" representing a numerical range means "A or more (including A and greater than A) and B or less (including B and less than B)".

[1. Technical idea of one embodiment of the present invention]
Polycarbonate-based resins have high viscosity and low fluidity, so they sometimes require high-temperature treatment for molding. Therefore, polycarbonate-based resins are sometimes required to have improved fluidity from the viewpoint of improving handleability (moldability) in molding. Further, the polycarbonate resin is also required to be capable of realizing a molded article having good strength and good appearance (color tone, transparency, etc.). Methods for improving the fluidity of polycarbonate-based resins include adding various fluidity-improving agents such as low-molecular-weight compounds and/or high-molecular-weight compounds to polycarbonate-based resins.

An example of a fluidity improver is the polyester-polyether copolymer disclosed in Patent Document 1. The polyester-polyether copolymer is a copolymer of an aromatic polyester unit and a modified polyether unit having a bisphenol skeleton, and can impart fluidity to the polycarbonate resin.

However, as a result of investigation by the present inventors, the resin composition described in Patent Document 1 is further improved in terms of the strength, color tone, and transparency of the molded polycarbonate-based resin obtained by molding the resin composition. It turns out that there is room for

One embodiment of the present invention has been made in view of the above problems, and the object thereof is to provide a molded article having excellent strength, color tone and transparency, and to provide a polycarbonate resin composition having excellent fluidity. An object of the present invention is to provide a novel fluidity improver and related technology.

As a result of intensive studies to solve the above problems, the present inventors have newly found the following knowledge and completed the present invention: an aromatic polyester unit and a polyether glycol unit containing no aromatic group. The flow improver containing a polyester-polyether copolymer is a polycarbonate-based resin composition having excellent fluidity, and a polycarbonate-based resin capable of providing a molded article having excellent strength, color tone and transparency. Ability to provide compositions.

[2. Fluidity improver]
A flow improver according to one embodiment of the present invention comprises a polyester-polyether glycol copolymer having aromatic polyester units and polyether glycol units, said polyether glycol units being polypentamethylene ether glycol units, A fluidity improver for polycarbonate resins containing at least one selected from the group consisting of polytetramethylene ether glycol units, polypropylene glycol units, polyethylene glycol units and polyoxymethylene units and containing no aromatic group. be. In this specification, the fluidity improver according to one embodiment of the present invention may be hereinafter referred to as "present fluidity improver".

Since the present fluidity improver has the above-described structure, it provides a polycarbonate resin composition that is excellent in fluidity and that can provide a molded article that is excellent in strength, color tone and transparency. have the advantage of being able to

(2-1. Polyester-polyether glycol copolymer)
The flow improver comprises a polyester-polyether glycol copolymer. The polyester-polyether glycol copolymer has aromatic polyester units and polyether glycol units.

(aromatic polyester unit)
As used herein, an "aromatic polyester unit" is a structural unit derived from an aromatic polyester.

The aromatic polyester unit in the polyester-polyether glycol copolymer functions as a hard segment in the fluidity improver to improve compatibility with the polycarbonate resin.

The aromatic polyester is not particularly limited. and one or more monomers selected from the group consisting of polar derivatives. Here, "an ester-forming derivative of an aromatic dicarboxylic acid" is intended to mean "a derivative of an aromatic dicarboxylic acid having a functional group capable of forming an ester (for example, a carboxy group) and capable of forming an ester". In addition, the term "ester-forming derivative of a diol" intends "a derivative of a diol having a functional group capable of forming an ester (for example, a hydroxy group) and capable of forming an ester". Therefore, the aromatic polyester unit is, for example, (a) one structural unit derived from one or more monomers selected from the group consisting of aromatic dicarboxylic acids and ester-forming derivatives thereof, and (b) It may be a structural unit formed by combining with one structural unit derived from one or more monomers selected from the group consisting of.

Specific examples of aromatic dicarboxylic acids include terephthalic acid, isophthalic acid, phthalic acid, diphenyldicarboxylic acid and diphenoxyethanedicarboxylic acid. Among these, terephthalic acid is preferable as the aromatic dicarboxylic acid from the viewpoint of economy. In other words, the aromatic polyester unit preferably contains a structural unit derived from terephthalic acid.

Aromatic polyester units, in addition to the structural units derived from the above-mentioned aromatic dicarboxylic acid, in its structural units, a proportion smaller than the structural units derived from the above-mentioned aromatic dicarboxylic acid (for example, the aromatic dicarboxylic acid 15 parts by mass or less relative to a total of 100 parts by mass of structural units derived from), monomers other than aromatic dicarboxylic acids (e.g., (a) aromatic oxycarboxylic acids such as oxybenzoic acid, (b) adipine acids and aliphatic dicarboxylic acids such as sebacic acid, and (c) one or more monomers selected from the group consisting of aliphatic dicarboxylic acids such as cyclohexane-1,4-dicarboxylic acid). It may contain structural units.

Ester-forming derivatives of aromatic dicarboxylic acids include dialkyl aromatic dicarboxylic acids. From the viewpoint of transesterification reactivity, the alkyl group of the dialkyl aromatic dicarboxylate is preferably a methyl group.

Diols can be low molecular weight glycol moieties that form ester units. Specific examples of diols include low molecular weight glycols having 2 to 10 carbon atoms such as ethylene glycol, trimethylene glycol, propylene glycol, tetramethylene glycol, hexanediol, decanediol and cyclohexanedimethanol. Among these, one or more selected from the group consisting of ethylene glycol, trimethylene glycol and tetramethylene glycol is preferable as the diol from the viewpoint of availability. In other words, the aromatic polyester unit preferably contains one or more selected from the group consisting of ethylene glycol units, trimethylene glycol units and tetramethylene glycol units in its constitutional units.

Specific examples of aromatic polyester units include polyethylene terephthalate units, polytrimethylene terephthalate units, polypropylene terephthalate units, polytetramethylene terephthalate units and polybutylene terephthalate units. The polyester-polyether glycol copolymer may contain one of the above aromatic polyester units alone, or may contain two or more in combination.

The aromatic polyester unit preferably contains one or more selected from the group consisting of polyethylene terephthalate units, polypropylene terephthalate units and polybutylene terephthalate units, and one selected from the group consisting of polyethylene terephthalate units and polypropylene terephthalate units. It is more preferable to contain the above, and it is particularly preferable to contain polyethylene terephthalate units. With this configuration, (a) the melting point of the hard segment composed of the aromatic polyester unit is increased, so that the molded article containing the fluidity improver can exhibit high heat resistance, and (b) the molded article can be It has the advantage of being able to exhibit chemical resistance.

The aromatic polyester unit is one or more selected from the group consisting of polyethylene terephthalate units, polypropylene terephthalate units and polybutylene terephthalate units in a total of 100% by mass of the aromatic polyester units contained in the polyester-polyether glycol copolymer. Preferably, it contains 50% by mass or more, more preferably 60% by mass or more, more preferably 70% by mass or more, more preferably 80% by mass or more, and more preferably 90% by mass or more. , 95% by mass or more is particularly preferable. With this configuration, (a) the melting point of the hard segment composed of the aromatic polyester unit becomes higher, so that the molded article containing the fluidity improver can exhibit higher heat resistance, and (b) the molding It has the advantage that the body can develop excellent chemical resistance. The aromatic polyester unit is one or more selected from the group consisting of polyethylene terephthalate units, polypropylene terephthalate units and polybutylene terephthalate units in a total of 100% by mass of the aromatic polyester units contained in the polyester-polyether glycol copolymer. may contain 100% by mass. That is, the aromatic polyester units may consist of only one or more selected from the group consisting of polyethylene terephthalate units, polypropylene terephthalate units and polybutylene terephthalate units.

(polyether glycol unit)
As used herein, the term “polyether glycol unit” refers to a structural unit derived from polyether glycol, _{in which} an oxy Structural units containing alkylene units are contemplated. In the general formula, n represents the number of carbon atoms in the oxyalkylene unit and is an integer of 1 or more. The oxyalkylene unit may be linear or branched. In other words, "polyether glycol units" are "polyoxyalkylene units".

The polyether glycol unit in the polyester-polyether glycol copolymer functions as a soft segment to improve the fluidity of the resin composition.

The polyether glycol units are not particularly limited, and examples thereof include polypentamethylene ether glycol units, polytetramethylene ether glycol units, polytrimethylene ether glycol units, polypropylene glycol units, polyethylene glycol units and polyoxymethylene units. be done. Polyether glycol units include one or more selected from the group consisting of polypentamethylene ether glycol units, polytetramethylene ether glycol units, polypropylene glycol units, polyethylene glycol units and polyoxymethylene units. This structure has the advantage that a soft segment having a low glass transition temperature can be formed from a compound containing a polyether glycol unit, which is easily available.

The polyether glycol unit more preferably contains one or more selected from the group consisting of polytetramethylene ether glycol units, polypropylene glycol units and polyethylene glycol units, and the group consisting of polytetramethylene ether glycol units and polypropylene glycol units. It is more preferable to contain one or more selected from among them, and it is particularly preferable to contain a polytetramethylene ether glycol unit. This structure has the advantage that a soft segment having a particularly low glass transition temperature can be constructed from a compound containing a polyether glycol unit, which is more easily available, as a raw material.

Polyether glycol units are polypentamethylene ether glycol units, polytetramethylene ether glycol units, polypropylene glycol units, polyethylene glycol units and It preferably contains 50% by mass or more of one or more selected from the group consisting of polyoxymethylene units, more preferably 60% by mass or more, more preferably 70% by mass or more, and 80% by mass or more. is more preferable, more preferably 90% by mass or more, and particularly preferably 95% by mass or more. This configuration has the advantage that a soft segment with a lower glass transition temperature can be constructed from polyether glycol units that are more readily available. Polyether glycol units are polypentamethylene ether glycol units, polytetramethylene ether glycol units, polypropylene glycol units, polyethylene glycol units and It may contain 100% by mass of one or more selected from the group consisting of polyoxymethylene units. That is, the polyether glycol units are composed of only one or more selected from the group consisting of polypentamethylene ether glycol units, polytetramethylene ether glycol units, polypropylene glycol units, polyethylene glycol units and polyoxymethylene units. good too.

The weight average molecular weight (Mw) of the polyether glycol or polyether glycol ester from which the polyether glycol unit is derived (raw material) is not particularly limited, but is preferably 300 to 5000, more preferably 350 to 4500, and 400 to 4000. is more preferred, 450 to 3500 is more preferred, 500 to 3000 is more preferred, 550 to 2500 is even more preferred, 600 to 2000 is even more preferred, and 600 to 1500 is particularly preferred. This configuration has the advantage that a soft segment with a lower glass transition temperature can be constructed from polyether glycol units that are more readily available. In other words, the polyether glycol unit is a building block derived from a polyether glycol or an ester of a polyether glycol having a weight average molecular weight (Mw) within the ranges mentioned above. The weight average molecular weight (Mw) of polyether glycol or polyether glycol ester can be measured by GPC using a dimethylacetamide solution containing 0.02 mol/l of LiBr as a developing liquid.

In the process of intensive investigation, the present inventors have found that the number of oxyalkylene units in the polyester-polyether glycol copolymer is determined by the Izod impact strength (kJ/m ² ), the color tone YI (-) and/or the haze (% ), we obtained a surprising new finding that it can affect The number of oxyalkylene units in 1 g of the polyester-polyether glycol copolymer (number of oxyalkylene units/g copolymer) is preferably 1.00 to 6.00, more preferably 1.25 to 5.75, 1.25 to 5.50 are more preferred, and 1.50 to 5.25 are particularly preferred. This configuration has the advantage that a soft segment with a lower glass transition temperature can be constructed from polyether glycol units that are more readily available. Here, "the number of oxyalkylene units in 1 g of polyester-polyether glycol copolymer (number of oxyalkylene units/g copolymer)" is a value obtained by calculating according to the following formula:
Number of oxyalkylene units in 1 g of polyester-polyether glycol copolymer (number of oxyalkylene units/g copolymer) = [polyether glycol or polyether glycol ester from which polyether glycol units are derived (raw material) Weight average molecular weight (Mw)] × [Amount of polyether glycol units in the polyester-polyether glycol copolymer (% by mass) (where the total of aromatic polyester units and polyether glycol units is 100% by mass) ]/(100×molecular weight of oxyalkylene unit).

The polyether glycol units do not contain aromatic groups. With this configuration, the obtained fluidity improver has the advantage of being able to provide a polycarbonate-based resin composition capable of providing a molded article having excellent strength. As used herein, "aromatic group" intends a functional group having an aromatic ring derived from a benzene ring.

Specific examples of aromatic groups include (a) monocyclic aromatic groups such as phenyl, benzyl, tolyl, benzyl, benzoyl and phenylene groups, and (b) biphenylyl, naphthyl and naphthylene groups. and polycyclic aromatic groups such as

(Other structural units)
The polyester-polyether glycol copolymer may have structural units other than the aromatic polyester units and polyether glycol units described above. In the present specification, "structural units other than the aromatic polyester units and polyether glycol units in the polyester-polyether glycol copolymer" may be hereinafter referred to as "other structural units".

Other structural units that the polyester-polyether glycol copolymer may contain are not particularly limited, but for example (a) aromatic hydroxycarboxylic acid, aromatic dicarboxylic acid, aromatic diol, aromatic hydroxylamine, aromatic diamine and aromatic compounds such as aromatic aminocarboxylic acids (b) alicyclic compounds such as caprolactams, caprolactones, aliphatic dicarboxylic acids, aliphatic diols, aliphatic diamines, alicyclic dicarboxylic acids and alicyclic diols, and (c) sulfur-containing aromatic compounds such as aromatic mercaptocarboxylic acids, aromatic dithiols and aromatic mercaptophenols. Only one type of other structural unit may be used, or two or more types may be used in combination.

(Constituent unit content)
In the polyester-polyether glycol copolymer, when the total of the aromatic polyester unit and the polyether glycol unit is 100% by mass, (a) the aromatic polyester unit is 50% by mass to 90% by mass, and the polyether Glycol units are preferably 10% by mass to 50% by mass, (b) aromatic polyester units are 55% by mass to 85% by mass, and polyether glycol units are 15% by mass to 45% by mass. More preferably, (c) the aromatic polyester unit is 60% by mass to 80% by mass, and the polyether glycol unit is more preferably 20% by mass to 40% by mass, (d) the aromatic polyester unit is More preferably, it is 65% by mass to 75% by mass and the polyether glycol unit is 25% by mass to 35% by mass. According to this configuration, the fluidity improver can provide a molded article having excellent heat resistance in addition to strength, color tone and transparency, and can provide a polycarbonate-based resin composition having excellent fluidity. , has the advantage of

The polyester-polyether glycol copolymer preferably contains 50% by mass or more of aromatic polyester units and polyether glycol units in total in 100% by mass of all structural units contained in the polyester-polyether glycol copolymer. , more preferably 60% by mass or more, more preferably 70% by mass or more, more preferably 80% by mass or more, even more preferably 90% by mass or more, particularly preferably 95% by mass or more . With this configuration, the resin composition containing the present fluidity improver has the advantage that it can exhibit better fluidity, and the molded article obtained by molding the resin composition can exhibit better strength. The polyester-polyether glycol copolymer may contain a total of 100% by mass of aromatic polyester units and polyether glycol units in 100% by mass of all structural units contained in the polyester-polyether glycol copolymer. That is, the polyester-polyether glycol copolymer may consist of only two constituent units, an aromatic polyester unit and a polyether glycol unit.

When the polyester-polyether glycol copolymer has other structural units, the polyester-polyether glycol copolymer has other structural units with respect to a total of 100 parts by mass of the aromatic polyester units and the polyether glycol units. , It preferably contains 0.1 parts by mass to 30 parts by mass, more preferably 0.1 parts by mass to 20 parts by mass, more preferably 0.1 parts by mass to 15 parts by mass, 0.1 parts by mass It is more preferable to contain up to 10 parts by mass. According to this configuration, the fluidity improver can fully exhibit the advantages of the aromatic polyester unit and the polyether glycol unit, while also exhibiting the functions of the other structural units.

(Mode of copolymerization)
In the polyester-polyether glycol copolymer, the bonding mode of the structural units (in other words, the mode of copolymerization of the starting monomers) can be appropriately selected. Specific examples of the bonding mode of the structural units (copolymerization mode of the raw material monomers) include random bonding (random polymerization), block bonding (block polymerization), graft bonding (graft polymerization) and alternating bonding (alternating polymerization). etc. The binding mode of the structural units is preferably block binding (block polymerization). With this configuration, in the polyester-polyether glycol copolymer, the aromatic polyester units can more preferably function as hard segments, and the polyether glycol units can more preferably function as soft segments.

(Polyester-polyether glycol copolymer content)
The fluidity improver preferably contains 70% by mass or more, more preferably 80% by mass or more, and 90% by mass of the polyester-polyether glycol copolymer in the total 100% by mass of the fluidity improver. % or more, and particularly preferably 95 mass % or more. According to this configuration, the fluidity improver can fully exhibit the advantages of the polyester-polyether glycol copolymer.

(Intrinsic viscosity (IV value) of polyester-polyether glycol copolymer)
The intrinsic viscosity (IV value) of the polyester-polyether glycol copolymer is preferably in the range of 0.20 to 1.00, more preferably in the range of 0.30 to 0.80. A range of 30 to 0.60 is more preferred, and a range of 0.30 to 0.50 is particularly preferred. According to this configuration, the fluidity improver can provide a molded article having excellent strength and a polycarbonate-based resin composition having excellent fluidity. In the present specification, the IV value of the polyester-polyether glycol copolymer is intended to be the value measured by the method described in Examples.

The IV value of the polyester-polyether glycol copolymer may be adjusted within the preferred range described above, for example, by appropriately adjusting the viscosity-average molecular weight of the polyester-polyether glycol copolymer.

In this specification, the IV value is described as a dimensionless number without units, but converted to an intrinsic viscosity value with the same value as the IV value and with the unit dl/g, can be IV value X and intrinsic viscosity Xdl/g are synonymous with each other and may be described interchangeably. Here, X is a real number of 0 or more.

(2-2. Germanium compound)
The flow improver may contain a germanium compound. When a germanium compound is used as a catalyst in the process of producing a polyester-polyether glycol copolymer, the fluidity improver obtained may contain the germanium compound. In other words, the polyester-polyether glycol copolymer may be produced using a germanium compound as a catalyst. A germanium compound does not exert an adverse effect such as hydrolysis on a polycarbonate resin. Therefore, even if the present fluidity improver for polycarbonate-based resins contains a germanium compound, the effect as a fluidity improver is not adversely affected.

Specific examples of germanium compounds include: germanium oxides such as germanium dioxide; germanium alkoxides such as germanium tetraethoxide and germanium tetraisopropoxide; germanium hydroxide; germanium dalicolate; germanium chloride; . Only one type of germanium compound may be used, or two or more types may be used in combination.

The content of the germanium compound in the fluidity improver is not particularly limited, depending on the amount of the germanium compound used as a catalyst when producing the polyester-polyether glycol copolymer. The content of the germanium compound in the fluidity improver may be, for example, 50 ppm to 2000 ppm, or 100 ppm to 1000 ppm, relative to the weight of the polyester-polyether glycol copolymer.

(2-3. Components of Other Fluidity Improvers)
The fluidity improver may contain components other than the polyester-polyether glycol copolymer and the germanium compound described above. In the present specification, "components other than the polyester-polyether glycol copolymer in the present fluidity improver" may be hereinafter referred to as "components of other fluidity improvers".

Specific examples of components of other fluidity improvers include (a) the catalyst and solvent used in the process for producing the polyester-polyether glycol copolymer described above, (b) impurities contained in the raw materials, and (c) the By-products generated in the manufacturing process, and (d) additives such as stabilizers, and the like. Stabilizers include, for example, (a) hindered phenols such as IRGANOX (registered trademark) 1010 (manufactured by BASF, pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate) and (b) phosphite-based stabilizers such as ADEKA STAB® 2112 (manufactured by ADEKA, tris(2,4-di-tert-butylphenyl)phosphite).

(2-4. Manufacturing method of fluidity improver)
The fluidity improver is prepared by combining a compound having aromatic polyester units or a portion of such units with a compound having polyether glycol units or a portion of such units using any method known to those skilled in the art. It can be produced by polymerization.

The method for producing the present fluidity improver is not particularly limited, but includes, for example, the following methods (x1) to (x4): (x1) Direct ester of aromatic dicarboxylic acid, diol and polyether glycol (x2) transesterification of (a) dialkyl aromatic dicarboxylate, (b) diol, and (c) polyether glycol and/or ester of polyether glycol; (x3) dialkyl aromatic dicarboxylate and A method of adding polyether glycol to the reaction mixture during or after the transesterification of the diol to carry out a polycondensation reaction; how to.

Specific examples of the aromatic dicarboxylic acid, the diol, and the dialkyl aromatic dicarboxylate are the same as those described in the section (2-1. Polyester-polyether glycol copolymer) above, so the description is incorporated. , the description is omitted here.

In the methods (x1) to (x4) described above, the IV value of the obtained polyester-polyether copolymer is adjusted by adjusting the reaction time, adjusting the degree of pressure reduction of the reaction system, adding a monofunctional low-molecular weight compound, or can be adjusted by a combination of Monofunctional low-molecular-weight compounds that can be used include monohydric phenols, monoamines having 1 to 20 carbon atoms, aliphatic monocarboxylic acids, carbodiimides, epoxies and/or oxazolines. Specific examples of monohydric phenols include (a) phenol, p-cresol, pt-butylphenol, pt-octylphenol, p-cumylphenol, p-nonylphenol, pt-amylphenol and 4-hydroxy biphenyls, and (b) any mixtures thereof, and the like. Among the monohydric phenols, pt-butylphenol and/or p-cumylphenol are preferred from the viewpoint of high boiling point and easy polymerization. Specific examples of aliphatic monocarboxylic acids include (a) acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, caprylic acid, lauric acid, tridecanoic acid, myristic acid, palmitic acid, stearic acid, pivalic acid and isobutyric acid. and (b) any mixture thereof, and the like. Among the aliphatic monocarboxylic acids, one or more selected from the group consisting of myristic acid, palmitic acid and stearic acid are preferable from the viewpoint of high boiling point and easy polymerization. Specific examples of monoamines include (a) aliphatic monoamines such as methylamine, ethylamine, propylamine, butylamine, hexylamine, octylamine, decylamine, stearylamine, dimethylamine, diethylamine, dipropylamine and dibutylamine, and ( b) any mixture thereof, and the like. Specific examples of carbodiimides include (a) dicyclohexylcarbodiimide, diisopropylcarbodiimide, dimethylcarbodiimide, diisobutylcarbodiimide, dioctylcarbodiimide, t-butylisopropylcarbodiimide, diphenylcarbodiimide, di-t-butylcarbodiimide, di-β-naphthylcarbodiimide, bis- 2,6-diisopropylphenylcarbodiimide, poly(2,4,6-triisopropylphenylene-1,3-diisocyanate), 1,5-(diisopropylbenzene) polycarbodiimide, 2,6,2',6'-tetraisopropyl diphenylcarbodiimide, and (b) any mixtures thereof, and the like. Specific examples of epoxies include (a) ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, triethylolpropane polyglycidyl ether, glycerol diglycidyl ether, glycerol triglycidyl ether, and sorbitol polyglycidyl ether. , bisphenol A-diglycidyl ether, hydrogenated bisphenol A-glycidyl ether, 4,4′-diphenylmethane diglycidyl ether, terephthalic acid diglycidyl ester, isophthalic acid diglycidyl ester, methacrylic acid glycidyl ester, methacrylic acid glycidyl ester polymer , methacrylic acid glycidyl ester polymer-containing compounds, and (b) any mixtures thereof. Specific examples of oxazoline include (a) styrene/2-isopropenyl-2-oxazoline, 2-isopropenyl-2-oxazoline, 1,3-phenylenebis(2-oxazoline), and (b) mixtures thereof. , are mentioned.

In the method (x4) described above, the IV value of the obtained polyester-polyether glycol copolymer can be adjusted by appropriately selecting the IV value of the aromatic polyester used. Since a polyester-polyether glycol copolymer having an IV value in the range of 0.20 to 1.00 can be easily obtained, the IV value of the aromatic polyester used in the production method of the fluidity improver is , preferably 0.4 to 1.0, more preferably 0.5 to 0.8.

Specific examples of polyoxyalkylene glycols include polypentamethylene ether glycol, polytetramethylene ether glycol, polyethylene glycol, polyoxymethylene and polypropylene glycol. Among them, polytetramethylene ether glycol is preferable as the polyoxyalkylene glycol from the viewpoint of the glass transition temperature of the soft segment.

In the method for producing the fluidity improver, a catalyst may be used in order to allow the polymerization reaction to proceed efficiently. In the production method of the fluidity improver, it is preferable to use a germanium compound as a catalyst for the polymerization reaction. This configuration can increase the reaction rate of the polymerization reaction. Furthermore, when a germanium compound is used as a catalyst for the polymerization reaction, compared with the case where a catalyst other than a germanium compound (for example, an antimony compound) is used, (a) hydration of the polycarbonate resin to which the present fluidity improver is added The decomposition reaction and (b) the transesterification reaction between the polycarbonate resin and the fluidity improver can be reduced.

Specific examples of the germanium compound are the same as those described in the above section (2-2. Germanium compound), so the description is incorporated and the description is omitted here.

The amount of the germanium compound used in the production of the fluidity improver is not particularly limited, but is 50 ppm to 2000 ppm based on the mass of the resulting polyester-polyether glycol copolymer from the viewpoint of reaction speed and economy. is preferred, and 100 ppm to 1000 ppm is more preferred.

[3. Resin composition]
A resin composition according to one embodiment of the present invention is based on 40.0 parts by mass to 99.5 parts by mass of a polycarbonate resin and 0.5 parts by mass to 60.0 parts by mass of a polyester-polyether glycol copolymer. A resin composition containing as a material resin, wherein the polyester-polyether glycol copolymer has an aromatic polyester unit and a polyether glycol unit, and the polyether glycol unit is a polypentamethylene ether glycol unit, a poly The resin composition contains one or more selected from the group consisting of tetramethylene ether glycol units, polypropylene glycol units, polyethylene glycol units and polyoxymethylene units and does not contain an aromatic group.

As used herein, the term "base resin" means a resin (or resin mixture) that constitutes 50% by mass or more of the total 100% by mass of the resin composition. The base resin preferably constitutes 70% by mass or more, more preferably 90% by mass or more, and even more preferably 95% by mass or more of the total 100% by mass of the resin composition. It is particularly preferred to constitute 99% by mass or more.

A resin composition according to one embodiment of the present invention is described below. In this specification, the resin composition according to one embodiment of the present invention may be hereinafter referred to as "this resin composition".

Since the present resin composition has the structure described above, it has the advantage of being able to provide a molded article having excellent fluidity, strength, color tone and transparency.

Each aspect of the present resin composition will be described in detail below. Fluidity improver] section is appropriately incorporated.

(3-1. Polyester-polyether glycol copolymer)
The present resin composition contains a polyester-polyether glycol copolymer as a base resin. The polyester-polyether glycol copolymer contained in the present resin composition is the same as that described in the above section (2-1. Polyester-polyether glycol copolymer), so the description is incorporated, Description is omitted here.

In the present resin composition, the content of the polyester-polyether glycol copolymer is 0.5 parts by mass to 60.0 parts by mass, preferably 1.0 parts by mass to 30.0 parts by mass, It is more preferably 2.0 parts by mass to 10.0 parts by mass. According to this configuration, advantages of the polyester-polyether glycol copolymer, such as improved fluidity, are preferably exhibited.

(3-2. Polycarbonate resin)
The present resin composition contains a polycarbonate-based resin as a base resin. As used herein, "polycarbonate-based resin" means a polymer having structural units containing carbonate ester bonds.

The polycarbonate-based resin is not particularly limited, but for example, a compound having two phenolic hydroxyl groups (hereinafter sometimes referred to as dihydric phenol) and a halogenated carbonyl compound such as phosgene are subjected to interfacial polycondensation. Polymers obtained, and polymers obtained by subjecting a dihydric phenol and a diester carbonate compound to a melt polymerization method (ester exchange method) can be mentioned.

Specific examples of dihydric phenols include 4,4′-dihydroxybiphenyl, bis(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)ethane, 2,2-bis(4-hydroxy phenyl)propane (bisphenol A), 2,2-bis(3-methyl-4-hydroxyphenyl)propane, 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane, 1,1-bis( 4-hydroxyphenyl)cyclohexane, bis(4-hydroxyphenyl)ether, bis(4-hydroxyphenyl)sulfide, bis(4-hydroxyphenyl)sulfone, bis(4-hydroxyphenyl)sulfoxide, bis(4-hydroxyphenyl) ketones, hydroquinones, resorcinols and catechols; Among the dihydric phenols, bis(hydroxyphenyl)alkanes are preferable, and dihydric phenols mainly composed of 2,2-bis(4-hydroxyphenyl)propane (bisphenol A) are more preferable.

Carbonyl halides, carbonyl esters and haloformates are examples of precursors for polycarbonate resins. Specific examples of precursors include (a) phosgene, (b) diaryl carbonates such as dihaloformates of dihydric phenols, diphenyl carbonate, ditolyl carbonate, bis(chlorophenyl) carbonate and m-cresyl carbonate, and (c) dimethyl aliphatic carbonate compounds such as carbonate, diethyl carbonate, diisopropyl carbonate, dibutyl carbonate, diamyl carbonate and dioctyl carbonate;

The polycarbonate-based resin may be a resin in which the molecular structure of the polymer chain is a linear structure, or a resin having a side chain structure on the linear structure. Branching agents for introducing such a branched structure include 1,1,1-tris(4-hydroxyphenyl)ethane, α,α′,α″-tris(4-hydroxyphenyl)-1,3 , 5-triisopropylbenzene, phloroglucine, trimellitic acid and isatin bis(o-cresol).

Further, the polycarbonate-based resin is (a) a homopolymer produced using only dihydric phenol, (b) a copolymer having a polycarbonate structural unit and a polyorganosiloxane structural unit, or (c) a homopolymer of these It may be a resin composition comprising a polymer and a copolymer. Further, the polycarbonate resin is a polyester-polycarbonate resin obtained by performing a polycondensation reaction of a dihydric phenol in the presence of a bifunctional carboxylic acid such as terephthalic acid or an ester precursor such as an ester-forming derivative thereof. There may be. Further, the polycarbonate-based resin may be a mixed resin obtained by melt-kneading various polycarbonate-based resins having various constitutional units.

The viscosity-average molecular weight of the polycarbonate-based resin is in the range of 10,000 to 60,000 from the viewpoint of further improving the impact resistance and chemical resistance of the molded article obtained by molding the present resin composition. is preferred.

In the present resin composition, the content of the polycarbonate resin is 40.0 parts by mass to 99.5 parts by mass, preferably 70.0 parts by mass to 99.0 parts by mass, and 90.0 parts by mass. More preferably, it is up to 98.0 parts by mass. According to this configuration, the advantages of the polycarbonate-based resin, such as the impact resistance of the molded article obtained from the resin composition, are preferably exhibited.

(3-3. Components other than base resin)
The present resin composition may contain components other than the base resin. Specific examples of components other than the base resin include (a) impact modifiers, (b) antioxidants such as phosphite-based antioxidants and hindered phenol-based antioxidants, (c) flame retardants, and (d) additives such as inorganic fillers;

(Impact modifier)
The present resin composition may contain 0.5 to 40 parts by mass of an impact modifier as a component other than the base resin. With this configuration, the present resin composition can provide a molded article having more excellent impact resistance.

Specific examples of the impact modifier include (a) a core/shell type graft polymer of a rubber-like elastomer and a vinyl compound, (b) a polyolefin polymer, and (c) an olefin-unsaturated carboxylic acid ester copolymer. polymers, and the like. Only one type of impact modifier may be used, or two or more types may be used in combination.

(Core/shell type graft polymer)
As used herein, the term "core/shell type graft polymer" means a graft polymer obtained by graft-polymerizing a specific vinyl compound (monomer) to a specific rubber-like elastomer.

The rubber-like elastic body preferably has a glass transition temperature of 0° C. or lower, more preferably 40° C. or lower.

Specific examples of rubber-like elastomers include: diene rubbers such as polybutadiene, butadiene-styrene copolymers, butadiene-acrylate copolymers and butadiene-acrylonitrile copolymers; acrylic rubbers such as ethylhexyl, dimethylsiloxane-butyl acrylate rubber and silicone/butyl acrylate composite rubbers; olefinic rubbers such as ethylene-propylene copolymers and ethylene-propylene-diene copolymers; dimethylsiloxane-based rubbers and dimethylsiloxane-diphenylsiloxane copolymer-based rubbers; Specific examples of butadiene-acrylic acid ester copolymers include butadiene-butyl acrylate copolymers and butadiene-2-ethylhexyl acrylate copolymers. From the viewpoint of impact resistance, specific examples of the rubber-like elastic body include one or more selected from the group consisting of polybutadiene, butadiene-styrene copolymer, butadiene-butyl acrylate copolymer and polydimethylsiloxane rubber. is preferably used.

The average particle size of the rubber-like elastic material is not particularly limited, but is preferably in the range of 0.05 μm to 2.00 μm, more preferably in the range of 0.1 μm to 0.4 μm. The gel content of the rubber-like elastic body is also not particularly limited, but is preferably in the range of 10% by mass to 99% by mass, more preferably in the range of 80% by mass to 96% by mass.

A core/shell type graft polymer has a shell on the surface of the rubbery elastomer. The shell is formed by polymerizing one or more vinyl compounds selected from the group consisting of aromatic vinyl compounds, vinyl cyanide compounds, acrylic acid ester compounds, and methacrylic acid ester compounds in the presence of the rubber-like elastomer. The resulting polymer. Only one kind of core/shell type graft polymer may be used, or two or more kinds may be used in combination.

Specific examples of aromatic vinyl compounds include styrene and α-methylstyrene. Specific examples of vinyl cyanide compounds include acrylonitrile and methacrylonitrile. Specific examples of acrylate compounds include butyl acrylate and 2-ethylhexyl acrylate. As a specific example of the methacrylic acid ester, methyl methacrylate is particularly preferred.

The ratio of the rubbery elastomer and the vinyl compound used in the production of the core/shell graft polymer is 10% to 90% by mass of the rubbery elastomer in the total 100% by mass of the core/shell graft polymer. is preferably 30% by mass to 85% by mass, preferably 10% by mass to 90% by mass, and more preferably 15% by mass to 70% by mass. . When the proportion of the rubber-like elastic material used is 10% by mass or more, the impact resistance tends to be further improved, and when it is 90% by mass or less, the heat resistance tends to be further improved. From the viewpoint of thermal stability, the core/shell type graft polymer is particularly preferably produced using an organic phosphorus emulsifier.

(Polyolefin polymer)
Specific examples of polyolefin polymers include (a) olefin homopolymers such as polyethylene and polypropylene, (b) ethylene-propylene copolymers, ethylene-butene copolymers, and ethylene-(4-methylpentene) copolymers. olefin copolymers such as ethylene-hexene copolymers, ethylene-octene copolymers and propylene-butene copolymers, and the like. The degree of polymerization of the polyolefin polymer is not particularly limited, but any polymer having a melt index in the range of 0.05 g/10 minutes to 50 g/10 minutes may be selected and used. As the polyolefin polymer, one or more selected from the group consisting of an ethylene-butene copolymer, an ethylene-hexene copolymer and an ethylene-octene copolymer is preferable from the viewpoint of further improving impact resistance. .

(Olefin-unsaturated carboxylic acid ester copolymer)
Specific examples of olefins constituting the olefin-unsaturated carboxylic acid ester copolymer include ethylene, propylene, 1-butene, 1-pentene, 1-hexene and 1-octene. Only one type of olefin may be used, or two or more types may be used in combination. Ethylene is particularly preferred as the olefin.

Specific examples of unsaturated carboxylic acid esters constituting the olefin-unsaturated carboxylic acid ester copolymer include methyl acrylate, ethyl acrylate, n-propyl acrylate, i-propyl acrylate, n-butyl acrylate, t-butyl acrylate, 2-ethylhexyl acrylate, glycidyl acrylate, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, i-propyl methacrylate, n-butyl methacrylate, t-butyl methacrylate, 2-ethylhexyl methacrylate and glycidyl methacrylate; be done. Only one type of unsaturated carboxylic acid ester may be used, or two or more types may be used in combination. As the unsaturated carboxylic acid ester, one or more selected from the group consisting of methyl acrylate, ethyl acrylate and dalicidyl methacrylate are particularly preferred.

The copolymerization ratio of the olefin and the unsaturated carboxylic acid ester in the olefin-unsaturated carboxylic acid ester copolymer is preferably 40/60 to 95/5, more preferably 50/50 to 90/10, in terms of mass ratio. is more preferable. When the mass ratio of the unsaturated carboxylic acid ester in the olefin-unsaturated carboxylic acid ester copolymer is (a) 5 or more, the chemical resistance tends to be further improved, and (b) when it is 60 or less. , the thermal stability during melting (for example, during molding) tends to be more improved.

In the olefin-unsaturated carboxylic acid ester copolymer, in addition to the olefin and the unsaturated carboxylic acid ester, vinyl acetate and styrene may be further copolymerized.

Specific examples of the olefin-unsaturated carboxylic acid ester copolymer include ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-propyl acrylate copolymer, and ethylene-butyl acrylate copolymer. Copolymer, ethylene-hexyl acrylate copolymer, ethylene-2-ethylhexyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethylene-butyl methacrylate copolymer, ethylene-hexyl methacrylate copolymer Polymer, ethylene-2-ethylhexyl methacrylate copolymer, ethylene-glycidyl acrylate copolymer, ethylene-glycidyl methacrylate copolymer, ethylene-glycidyl acrylate-vinyl acetate copolymer, ethylene-methacrylic acid glycidyl-vinyl acetate copolymer, ethylene-glycidyl acrylate-methyl acrylate copolymer and ethylene-glycidyl methacrylate-methyl acrylate copolymer, and the like. Among them, from the viewpoint of further improving impact resistance, ethylene-ethyl acrylate copolymer, ethylene-glycidyl methacrylate copolymer, ethylene-glycidyl methacrylate-vinyl acetate copolymer and ethylene-glycidyl methacrylate-acrylic acid At least one selected from the group consisting of methyl copolymers is preferred.

(Flame retardants)
As the flame retardant, any flame retardant commonly used in the art can be used without particular limitation. Flame retardants include (a) aromatic (condensed) phosphates such as triphenyl phosphate, tricresyl phosphate, resorcinol bisdiphenyl phosphate, resorcinol bis-dixylenyl phosphate and bisphenol A bis-diphenyl phosphate; Brominated flame retardants such as bromobisphenol A, brominated polycarbonate and brominated polystyrene, (c) polydimethylsiloxane, polydimethylsiloxane-polycarbonate copolymer, and rubber graft copolymer using polydimethylsiloxane rubber, etc. and (d) inorganic flame retardants such as potassium 3-phenylsulfonate and metal perfluorobenzenesulfonate. By using the flame retardant described above, the flame retardancy of the polycarbonate-based resin can be enhanced. Therefore, the use of the flame retardant described above is particularly useful when the present resin composition is used for home appliances and electric/electronic parts. The flame retardants described above may be used singly or in combination of two or more.

As the inorganic filler that can be blended in the present resin composition, inorganic fillers commonly used in the technical field can be used without particular limitation.

(3-4. Physical properties of resin composition)
The present resin composition has excellent fluidity and therefore excellent moldability. The fluidity of the present resin composition can be evaluated by measuring at least one of the melt flow rate (MFR) and spiral flow of the present resin composition.

In one embodiment of the present invention, if the resin composition has an MFR of 15.0 g/10 min or more, it can be determined that the resin composition has excellent fluidity. In another embodiment of the present invention, the ratio of the MFR obtained by measuring the resin composition to the MFR obtained by measuring the polycarbonate resin alone contained in the resin composition as a base resin (resin composition If the MFR of the product/MFR of the polycarbonate resin alone) is 1.30 or more, it can be determined that the resin composition has excellent fluidity. The ratio (MFR of the resin composition/MFR of the polycarbonate resin alone) is preferably 1.40 or more, more preferably 1.50 or more, and more preferably 1.60 or more, It is more preferably 1.70 or more, and particularly preferably 1.80 or more.

In one embodiment of the present invention, if the resin composition has a spiral flow of 550 mm or more, it can be determined that the resin composition has excellent fluidity. In another embodiment of the present invention, the ratio of the spiral flow obtained by measuring the resin composition to the spiral flow obtained by measuring the polycarbonate resin alone contained in the resin composition as a base resin ( If the ratio of spiral flow of the resin composition/spiral flow of the polycarbonate-based resin alone) is 1.05 or more, it can be determined that the resin composition has excellent fluidity. The ratio (spiral flow of the resin composition/spiral flow of the polycarbonate resin alone) is preferably 1.07 or more, more preferably 1.10 or more, and further preferably 1.12 or more. It is preferably 1.15 or more, and particularly preferably 1.15 or more.

In addition, in this specification, the MFR and spiral flow of the present resin composition are intended to be values measured by the methods described in Examples.

(3-5. Resin composition according to another embodiment)
A resin composition according to one embodiment of the present invention is not limited to the above embodiment. A resin composition according to another embodiment of the present invention is a resin composition containing a fluidity improver according to an embodiment of the present invention and a polycarbonate-based resin as a resin base material. Even with such a configuration, the resin composition according to another embodiment of the present invention has excellent strength, color tone and transparency. The configuration of the polycarbonate-based resin contained in the resin composition according to another embodiment of the present invention is the above-described polycarbonate-based resin (for example, the polycarbonate-based resin described in the section (3-2. Polycarbonate-based resin)). Since it is the same as , the description is used and the description is omitted here.

In the resin composition according to another embodiment of the present invention, the content of the fluidity improver is preferably 0.5 parts by mass to 60.0 parts by mass, more preferably 1.0 parts by mass to 30.0 parts by mass. It is more preferably 0 parts by mass, and even more preferably 2.0 to 10.0 parts by mass. Further, the content of the polycarbonate resin in the resin composition is preferably 40.0 parts by mass to 99.5 parts by mass, more preferably 70.0 parts by mass to 99.0 parts by mass. It is more preferably 0.0 mass part to 98.0 mass parts. According to this configuration, it is possible to realize a resin composition that further exhibits the advantages of the fluidity improver, such as fluidity, and the advantages of the polycarbonate resin, such as the impact resistance of the molded article obtained from the resin composition. can do.

[4. Method for producing a resin composition]
The present resin composition can be produced using any method known to those skilled in the art. Specific examples of the method for producing the present resin composition include, but are not limited to, a method for obtaining the present resin composition by performing the following (1) to (3) in order: 1) The polycarbonate resin and polyester-polyether glycol copolymer described above as the base resin, and optionally the components other than the base resin, are mixed using a mixer such as a blender or super mixer; (2) The resulting mixture is kneaded using a single-screw or multi-screw extruder or the like; (3) The kneaded product obtained is molded into an arbitrary shape such as pellets. Moreover, in the manufacturing method of this resin composition, you may melt-knead by heating in the case of kneading. In this case, temperature conditions and the like can be appropriately set.

[5. molded body]
A molded article according to one embodiment of the present invention is a molded article obtained by molding the resin composition according to one embodiment of the present invention. A molded article according to one embodiment of the present invention may be a molded article obtained by molding the resin composition according to another embodiment of the present invention. A molded article according to one embodiment of the present invention will be described below. In this specification, the molded article according to one embodiment of the present invention may be hereinafter referred to as "this molded article".

Each aspect of the present molded article will be described in detail below, but matters other than those described below (eg, various components and their amounts to be added) are not particularly limited, and the above description is used as appropriate.

(5-1. Shape and Appearance of Molded Body)
Since the present molded article is made of the present resin composition which is excellent in moldability, it can have various desired shapes. For example, even a large thin-walled molded article, which is difficult to mold with general polycarbonate-based resins, can be satisfactorily molded using the present resin composition. Therefore, the compact is preferably a large thin compact. Here, the term “large thin-walled compact” refers to a surface that has a large overall dimension (e.g., projected area) and a thin surface, or a surface that has a thin portion on a part of the surface. A compact having a
The molded body may be a large thin molded body having a projected area of, for example, 10,000 mm ² to 1,000,000 mm ² . The projected area of the molded article is preferably 30,000 mm ² to 7,000,000 mm ² , more preferably 50,000 mm ² to 4,000,000 mm ² from the viewpoint of surface appearance, heat resistance and strength (impact resistance) of the molded article. Further, the molded body may be a large thin molded body having an average thickness (average thickness of the thin portion) of 0.1 mm or more and less than 3.0 mm, for example. The average thickness of the molded body may be less than 2.5 mm or less than 2.0 mm. The lower limit of the average wall thickness of the molded product is preferably 1.0 mm or more, more preferably 1.5 mm or more, from the viewpoint of surface appearance, heat resistance and strength (for example, impact resistance) of the molded product. more preferred. Furthermore, the length of the molded body from the part corresponding to the entrance of the mold gate to the end of the molded body (out of the flow distance when the resin composition flows in the cavity of the mold) It may be a large-sized thin-walled compact having a substantial maximum length) exceeding 500 mm. When a conventional polycarbonate-based resin composition is formed into a large thin-walled molded article as described above, the strength of the molded article (especially the strength of the thin-walled portion) is not satisfactory. The molded article has the advantage of being excellent in strength (especially strength of the thin-walled portion) even when having the shape of a large thin-walled molded article as described above.

In addition, since the present molded article is made of the present resin composition, which is excellent in moldability, it has the advantage that the smoothness of the entire surface of the molded article is excellent even for a particularly large and thin-walled molded article. Therefore, when the surface of the molded article is coated, the surface appearance of the molded article after coating and the adhesion of the coating film are good. As the coating material and the coating method used for coating the molded body, known ones can be appropriately selected and adopted.

(5-2. Physical properties of molded product)
The molded article has excellent strength. The strength of the molded article can be evaluated by measuring the Izod impact strength of the molded article. In one embodiment of the present invention, if the Izod impact strength of the molded article is 70.0 kJ/m ² or more, the molded article can be judged to be excellent in strength. In another embodiment of the present invention, the ratio of the Izod impact strength obtained by measuring the molded body to the Izod impact strength obtained by measuring the molded body composed only of the polycarbonate resin contained in the molded body If the (Izod impact strength of the molded body/Izod impact strength of the molded body made of only the polycarbonate resin) is 0.80 or more, the molded body maintains the strength that the polycarbonate resin can originally express, Therefore, it can be determined that the strength is excellent. The ratio (Izod impact strength of the molded body/Izod impact strength of the molded body composed only of the polycarbonate-based resin) is preferably 0.90 or more, more preferably 0.95 or more.

The molded product has a low yellow index and therefore has excellent color tone. The color tone of the molded article can be evaluated by measuring the color tone YI of the molded article. In one embodiment of the present invention, if the color tone YI of the molded article is 4.00 or less, the molded article can be judged to be excellent in color tone. In another embodiment of the present invention, the ratio (molding If the color tone YI of the body/the color tone YI of the molded article made of only the polycarbonate resin) is 1.20 or less, the molded article maintains the color tone that the polycarbonate resin can originally express, and therefore has excellent color tone. It can be determined that The ratio (color tone YI of the molded body/color tone YI of the molded body composed only of the polycarbonate-based resin) is preferably 1.10 or less, more preferably 1.05 or less.

The molded article has excellent transparency. The transparency of the present molded article can be evaluated by measuring the haze of the present molded article. Generally, the haze of a compact can vary depending on the thickness of the compact. In one embodiment of the present invention, when the molded article has a thickness of 2 mm and the haze of the molded article is 20.00% or less, it can be judged that the molded article has excellent transparency. The haze is preferably 10.00% or less, more preferably 8.00% or less. In another embodiment of the present invention, a molded body (having a thickness of 2 mm) consisting only of a polycarbonate-based resin contained in the molded body, the haze of which is obtained by measuring a molded body having a thickness of 2 mm. If the ratio to the haze obtained by measurement (haze of a molded body having a thickness of 2 mm / haze of a molded body (having a thickness of 2 mm) consisting only of a polycarbonate resin) is 3.0 or less , the molded article maintains the transparency that the polycarbonate-based resin can originally exhibit, and therefore it can be judged that the transparency is excellent. The ratio (the haze of the molded body having a thickness of 2 mm/the haze of the molded body (having a thickness of 2 mm) consisting only of a polycarbonate resin) is preferably 2.5 or less, and 2.0 or less. It is more preferably 1.5 or less.

Further, the transparency of the present molded article may be evaluated by measuring the total light transmittance T% of the present molded article. In general, the total light transmittance T% of a molding can vary depending on the thickness of the molding. In one embodiment of the present invention, when the molded body has a thickness of 2 mm and the total light transmittance T% of the molded body is 85.00% or more, the molded body is excellent in transparency. can be judged. In another embodiment of the present invention, a molded body (2 mm thickness The ratio to the total light transmittance T% obtained by measuring the ratio (total light transmittance T% of a molded body having a thickness of 2 mm / molded body made only of polycarbonate resin (2 mm thick If the total light transmittance T%) of ) is 0.90 or more, the molded product maintains the transparency that the polycarbonate resin can originally express, and is therefore judged to be excellent in transparency. can. The ratio (total light transmittance T% of a molded body having a thickness of 2 mm/total light transmittance T% of a molded body (having a thickness of 2 mm) consisting only of a polycarbonate resin) is 0.95 or more. Preferably. Note that the thickness of the molded body is not limited to 2 mm.

In the present specification, the Izod impact strength, color tone YI, haze and total light transmittance T% of the present molded product are intended to be values measured by the methods detailed in the examples below.

(5-3. Manufacturing method of compact)
The present molded article can be produced by molding the resin composition according to one embodiment of the present invention using any method known to those skilled in the art.

A specific example of the method for producing the molded article is not particularly limited, but the resin composition according to one embodiment of the present invention is molded using a molding method such as injection molding, extrusion molding, blow molding, and compression molding. method. The molding method is preferably injection molding. Also, the resin composition according to one embodiment of the present invention may be used in compounding, such as an in-line compounding process or a direct compounding process, for example, as described in "Plastics Info World 11/2002 P20-35". , may form a molded body. In the method for producing the present molded article, the resin composition according to one embodiment of the present invention may be molded as it is, or may be molded after being mixed with a diluent.

[6. Application]
The fluidity improver according to one embodiment of the present invention is suitably compatible with a polycarbonate-based resin and can improve the fluidity of the polycarbonate-based resin. Therefore, the fluidity improver according to one embodiment of the present invention can be suitably used as an additive for improving the moldability of polycarbonate-based resins. In addition, the resin composition according to one embodiment of the present invention has excellent fluidity and can be easily molded. Furthermore, the molded article according to one embodiment of the present invention, which is obtained by molding the resin composition according to one embodiment of the present invention, is excellent in strength, color tone and transparency. From the above, the fluidity improver, the resin composition and the molded article according to one embodiment of the present invention are (a) parts for home appliances, (b) electrical and electronic parts, (c) sundries ) Automotive parts such as automotive seats, automotive interior parts and automotive exterior parts (especially head-up displays, head/tail lamp covers, garnishes, billers, spoilers, etc.), and (e) resin glass (e.g. as a raw material ), which can be used particularly preferably.

An embodiment of the present invention may have the following configuration.
[1] A polyester-polyether glycol copolymer having aromatic polyester units and polyether glycol units, wherein the polyether glycol units are polypentamethylene ether glycol units, polytetramethylene ether glycol units, polypropylene glycol units, A fluidity improver for a polycarbonate-based resin containing at least one selected from the group consisting of polyethylene glycol units and polyoxymethylene units and containing no aromatic group.
[2] The fluidity improver according to [1], further comprising a germanium compound.
[3] The fluidity improver according to [1] or [2], wherein the IV value of the polyester-polyether glycol copolymer is in the range of 0.20 to 1.00.
[4] The fluidity improver according to any one of [1] to [3], wherein the IV value of the polyester-polyether glycol copolymer is in the range of 0.30 to 0.60.
[5] In the polyester-polyether glycol copolymer, when the total of the aromatic polyester unit and the polyether glycol unit is 100% by mass, the aromatic polyester unit is 50% by mass to 90% by mass. , The fluidity improver according to any one of [1] to [4], wherein the polyether glycol unit is 10% by mass to 50% by mass.
[6] The aromatic polyester unit according to any one of [1] to [5], including one or more selected from the group consisting of polyethylene terephthalate units, polypropylene terephthalate units and polybutylene terephthalate units. Flow improver.
[7] The polyether glycol units are polypentamethylene ether glycol units, polytetramethylene ether glycol units, and polypropylene glycol in a total of 100% by mass of the polyether glycol units contained in the polyester-polyether glycol copolymer. The fluidity improver according to any one of [1] to [6], containing 50% by mass or more of one or more selected from the group consisting of units, polyethylene glycol units and polyoxymethylene units.
[8] The polyester-polyether glycol copolymer has a total of 50 aromatic polyester units and polyether glycol units in 100% by mass of all structural units contained in the polyester-polyether glycol copolymer. The fluidity improver according to any one of [1] to [7], containing at least 1% by mass.
[9] A resin composition comprising the fluidity improver according to any one of [1] to [8] and a polycarbonate-based resin.
[10] A resin composition containing 40.0 parts by mass to 99.5 parts by mass of a polycarbonate resin and 0.5 parts by mass to 60.0 parts by mass of a polyester-polyether glycol copolymer as a base resin, , the polyester-polyether glycol copolymer has aromatic polyester units and polyether glycol units, and the polyether glycol units are polypentamethylene ether glycol units, polytetramethylene ether glycol units, polypropylene glycol units, A resin composition containing one or more selected from the group consisting of polyethylene glycol units and polyoxymethylene units and containing no aromatic group.
[11] A molded article obtained by molding the resin composition according to [9] or [10].

EXAMPLES Hereinafter, one embodiment of the present invention will be described in more detail with reference to examples, comparative examples, manufacturing examples, and comparative manufacturing examples, but the present invention is not limited to these. One embodiment of the present invention can be modified and implemented as long as it conforms to the spirit of the above and later descriptions, and all of them are included in the technical scope of the present invention. In this specification, Examples, Comparative Examples, Production Examples, and Comparative Production Examples may be collectively referred to as “Examples, etc.” hereinafter.

〔Evaluation methods〕
First, methods for evaluating the fluidity improver, the resin composition, and the molded article in Examples and the like will be described.

<Measurement of intrinsic viscosity (IV value) of polyester-polyether glycol copolymer>
The IV value of the polyester-polyether glycol copolymer contained in the fluidity improver is obtained by dissolving the fluidity improver in the following mixed solvent to a concentration of 0.5 g/dl according to JIS K7367. Also, a value obtained by measuring a solution containing a fluidity improver as a sample at 25° C. using an Ubbelohde viscometer was adopted. However, a mixed solvent of tetrachloroethane/phenol=50/50 (mass ratio) was used as the solution for dissolving the fluidity improver.

<Measurement of Melt Flow Rate (MFR) of Resin Composition>
The MFR of the resin composition was measured as follows: (1) The resin composition was heated to a barrel temperature of 200 to 260 ° C. using a twin-screw extruder (TEX44SS manufactured by Japan Steel Works, Ltd.), and the screw rotation speed After kneading at 100 rpm, the resulting kneaded product was extruded to obtain pellets of the resin composition (hereinafter also referred to as extruded pellets); After drying at 120° C. for 5 hours in a hot air dryer, the MFR was measured under conditions of a measurement temperature of 300° C. and a load of 1.2 kg.

From a practical point of view, if the resin composition has an MFR of 15.0 g/10 min or more, it can be determined that the resin composition has excellent fluidity. Moreover, from the viewpoint of comparison, the ratio of the MFR obtained by measuring the resin composition of the example or comparative example to the MFR obtained by measuring the polycarbonate resin alone contained as the base resin of the resin composition If (MFR of resin composition of Example or Comparative Example/MFR of polycarbonate-based resin alone) is 1.30 or more, it can be determined that the resin composition has excellent fluidity.

<Measurement of Spiral Flow of Resin Composition>
The spiral flow of the resin composition was measured as follows: (1) extruded pellets were obtained in the same manner as the extruded pellets used for measuring the MFR of the resin composition; , Using an injection molding machine (FAS100B manufactured by Fanuc), molding was performed under the conditions of a cylinder temperature of 300 ° C., a mold temperature of 90 ° C. and an injection pressure of 1350 kg / cm ² to form a spiral shaped body (width 10 mm, thickness 2 mm, The flow length at a pitch of 5 mm) was measured as spiral flow.

From a practical point of view, if the resin composition has a spiral flow of 550 mm or more, it can be determined that the resin composition has excellent fluidity. In addition, from the viewpoint of comparison, the spiral flow obtained by measuring the polycarbonate resin alone contained in the resin composition as the base resin of the spiral flow obtained by measuring the resin composition of the example or comparative example (spiral flow of the resin composition of the example or comparative example/spiral flow of the polycarbonate-based resin alone) is 1.05 or more, it can be determined that the resin composition has excellent fluidity.

<Measurement of Izod Impact Strength of Molded Body>
The Izod impact strength of the molded body was measured as follows: (1) extruded pellets were obtained in the same manner as the extruded pellets used for measuring the MFR of the resin composition; , After drying at 120 ° C. for 5 hours using a hot air dryer, using an injection molding machine (Mitsubishi Heavy Industries, Ltd. 160MSP) under the conditions of a molding temperature of 285 ° C. and a mold temperature of 70 ° C., a length of 63.5 mm , width 12.7 mm, thickness 3.2 mm, v-notched specimen; was measured for Izod impact strength.

From a practical point of view, if the Izod impact strength of the molded article is 70.0 kJ/m ² or more, it can be judged that the molded article is excellent in strength. In addition, from the viewpoint of comparison, the Izod impact strength obtained by measuring the molded body of Examples or Comparative Examples is compared to the Izod impact strength obtained by measuring the molded body composed only of the polycarbonate resin contained in the molded body. If the ratio to strength (Izod impact strength of molded articles of Examples or Comparative Examples/Izod impact strength of molded articles composed only of polycarbonate resin) is 0.80 or more, the molded article originally expresses polycarbonate resin. Therefore, it can be judged that the strength is excellent.

<Measurement of color tone YI of molded product>
The color tone YI of the molded body was measured as follows: (1) length 63.5 mm, width 12.7 mm, thickness 3.2 mm, instead of the v-notched specimen, length 85 mm, width 50 mm And the molded body was molded in the same manner as the molded body used for measuring the Izod impact strength except that it was a test piece with a thickness of 2 mm; Using a color difference meter (model: SE-2000) manufactured by Nippon Denshoku Industries Co., Ltd., the reflection YI value was measured as the color tone YI.

From a practical point of view, if the color tone YI of the molded article is 4.00 or less, it can be judged that the molded article is excellent in color tone. In addition, from the viewpoint of comparison, the color tone YI obtained by measuring the molded article of the example or comparative example is compared with the color tone YI obtained by measuring the molded article composed only of the polycarbonate resin contained in the molded article. If the ratio (color tone YI of the molded article of the example or comparative example/color tone YI of the molded article made of only polycarbonate-based resin) is 1.20 or less, the molded article has a color tone that the polycarbonate-based resin can originally express. Therefore, it can be judged that the color tone is excellent.

<Measurement of total light transmittance T% and haze of molded article>
The total light transmittance T% and haze of the molded article were measured as follows: (1) A molded article was molded as a test piece in the same manner as the molded article used for measuring the color tone YI; (2) The obtained molded product was measured for total light transmittance T% and haze at 23° C. using a color difference meter (model: SE-2000) manufactured by Nippon Denshoku Industries Co., Ltd. according to JIS K7375 standards.

From a practical point of view, if the molded article has a haze of 20.00% or less, it can be judged that the molded article has excellent transparency. In addition, from the viewpoint of comparison, the ratio of the haze obtained by measuring the molded article of Examples or Comparative Examples to the haze obtained by measuring the molded article composed only of the polycarbonate resin contained in the molded article ( When the haze of the molded article of the example or comparative example/the haze of the molded article made of only polycarbonate resin) is 3.0 or less, the molded article maintains the transparency that the polycarbonate resin can originally exhibit. Therefore, it can be judged that the transparency is excellent.

Moreover, from a practical point of view, when the total light transmittance T% of the molded article is 85.00% or more, it can be judged that the molded article has excellent transparency. In addition, from the viewpoint of comparison, the ratio of the total light transmittance T% of the molded body of the example or comparative example to the total light transmittance T% measured for the molded body composed only of the polycarbonate resin contained in the molded body ( If the total light transmittance T% of the molded article of the example or comparative example/total light transmittance T% of the molded article made of polycarbonate resin only) is 0.90 or more, the molded article is made of polycarbonate resin. It maintains the transparency that can be originally developed, and therefore can be judged to be excellent in transparency.

[Manufacturing example]
(Production Example 1) Production of fluidity improver (A1) 70 parts by mass of polyethylene terephthalate (IV value 0.75) produced using a germanium compound as a catalyst in a reactor equipped with a stirrer and a gas discharge outlet, Germanium dioxide 0.03 parts by mass, stabilizer (BASF IRGANOX (registered trademark) 1010) 0.5 parts by mass, and polytetramethylene ether glycol (Mitsubishi Chemical Co. PTMG-1000, weight average molecular weight 1000) 30 parts by mass was added and kept at 270° C. for 4 hours. Then, the polycondensation reaction was carried out at 1 torr (33 Pa) while reducing the pressure of the reaction system using a vacuum pump. After 1 hour of the polycondensation reaction time, the pressure reduction was terminated to stop the polycondensation reaction. The reaction product, polyester-polyether glycol copolymer, was removed from the reactor and then cooled in a water bath to obtain strands. The resulting strand was post-crystallized and dried at the same time in a hot air dryer set at 100° C., then put into a pulverizer and pelletized to obtain a fluidity improver (A1) in the form of pellets. . Incidentally, the IV value of the polyester-polyether glycol copolymer as the reaction product was 0.45. In addition, the polyester-polyether glycol copolymer that is the reaction product is composed only of two types of structural units: a polyethylene terephthalate unit, which is an aromatic polyester unit, and a polytetramethylene ether glycol unit, which is a polyether glycol unit. It had been. Further, in the polyester-polyether glycol copolymer which is the reaction product, when the total of polyethylene terephthalate units and polytetramethylene ether glycol units is 100% by mass, the polyethylene terephthalate unit is 70% by mass, and polytetramethylene Ether glycol units were 30% by mass.

(Production Example 2) Production of fluidity improver (A2) By the same method as in Production Example 1, except that the polycondensation reaction time at 1 torr (33 Pa) after decompression was changed to 45 minutes (0.75 hours). , to obtain a fluidity improver (A2) in the form of pellets. The IV value of the polyester-polyether glycol copolymer as the reaction product was 0.35.

(Production Example 3) Production of fluidity improver (A3) Production except that the polyether glycol used was changed to 30 parts by mass of polytetramethylene ether glycol (PTMG-650 manufactured by Mitsubishi Chemical Corporation, weight average molecular weight 650) A fluidity improver (A3) in pellet form was obtained by the same method as in Example 1. The IV value of the polyester-polyether glycol copolymer as the reaction product was 0.43.

(Production Example 4) Production of fluidity improver (A4) The amount of polyethylene terephthalate (IV value 0.75) used was changed to 90 parts by mass, and the polyether glycol used was polytetramethylene ether glycol (Mitsubishi Chemical Co., Ltd. A fluidity improver (A4) in the form of pellets was obtained in the same manner as in Production Example 1, except that PTMG-3000 and a weight average molecular weight of 3000) were changed to 10 parts by mass. The IV value of the polyester-polyether glycol copolymer as the reaction product was 0.41.

In Production Examples 2 to 4, the polyester-polyether glycol copolymer that is the reaction product is composed of two types of polyethylene terephthalate units, which are aromatic polyester units, and polytetramethylene ether glycol units, which are polyether glycol units. It consisted only of structural units. Further, in Production Examples 2 and 3, the polyester-polyether glycol copolymer that is the reaction product has a polyethylene terephthalate unit of 70 mass% when the total of the polyethylene terephthalate unit and the polytetramethylene ether glycol unit is 100 mass%. %, and the polytetramethylene ether glycol unit was 30% by mass. Further, in Production Example 4, the polyester-polyether glycol copolymer that is the reaction product contains 90% by mass of polyethylene terephthalate units when the total of polyethylene terephthalate units and polytetramethylene ether glycol units is 100% by mass. and the polytetramethylene ether glycol unit was 10% by mass.

(Comparative Production Example 1) Production of fluidity improver (B1) 70 parts by mass of polyethylene terephthalate (IV value 0.65) produced using a germanium compound as a catalyst in a reactor equipped with a stirrer and a gas discharge outlet. , 0.03 parts by weight of germanium dioxide, 0.5 parts by weight of a stabilizer (IRGANOX (registered trademark) 1010 manufactured by BASF), and 30 parts by weight of a modified polyether represented by the following formula 1, and added at 270 ° C. for 2 hours. held. Then, the polycondensation reaction was carried out at 1 torr (33 Pa) while reducing the pressure of the reaction system using a vacuum pump. When 0.6 hours of the polycondensation reaction time had elapsed, the pressure reduction was terminated to terminate the polycondensation reaction. The reaction products, various polyester-polyether copolymers, were removed from the reactor and then cooled in a water bath to form strands. The resulting strand was post-crystallized and dried at the same time in a hot air dryer set at 100° C., then put into a pulverizer and pelletized to obtain a fluidity improver (B1) in the form of pellets. . Incidentally, the IV value of the polyester-polyether copolymer, which is the reaction product, was 0.45.

Table 1 shows the types of polyethylene terephthalate (PET) and polyether glycol used in Production Examples 1 to 4 and Comparative Production Example 1, their blending amounts (parts by mass), and polycondensation time (hours). Table 1 also shows the IV values of the polyester-polyether copolymers obtained in Production Examples 1 to 4 and Comparative Production Example 1, and the number of oxyalkylene units/g copolymer.

(Comparative Production Example 2) Production of Fluidity Improver (B2) 4,4'-dihydroxybiphenyl, bisphenol A and sebacin were placed in a closed reactor equipped with a reflux condenser, thermometer, nitrogen gas inlet tube and stirring rod. Acids were added in a molar ratio of 30:20:50. Acetic anhydride was added to the closed reactor in an amount of 1.05 equivalents per phenolic hydroxyl group of the added monomer. Furthermore, 0.2% by mass of a phosphite-based antioxidant (ADEKA PEP36) was added to the closed reactor relative to the mass of the polyester to be produced. After the monomers were reacted at 145° C. under normal pressure and a nitrogen gas atmosphere to obtain a uniform solution, the temperature was raised to 240° C. at 2° C./min while distilling off the acetic acid produced, and the temperature was maintained at 240° C. for 2 hours. Stirred. While maintaining the temperature, the pressure was reduced to 5 Torr over about 60 minutes, and then the reduced pressure was maintained. After 2.5 hours from the start of depressurization, the internal pressure of the closed reactor was returned to normal pressure using nitrogen gas, and the fluidity improver (B2) was taken out from the closed reactor. The number average molecular weight of the polyester contained in the obtained fluidity improver (B2) was 3,900.

(Comparative Production Example 3) Production of fluidity improver (B3) 0.45 parts by mass of potassium palmitate was dry-blended with 100 parts by mass of an acrylic impact modifier M-570 (manufactured by Kaneka) to obtain fluidity. A property improver (B3) was obtained.

[Example] Production of resin composition and molding <Material>
Materials used in Examples and Comparative Examples, other than the fluidity improvers produced in Production Examples and Comparative Production Examples, are listed.
・PC1: Polycarbonate resin (Iupilon (registered trademark) S-2000 manufactured by Mitsubishi Engineering-Plastics Co., Ltd.)
・PET: polyethylene terephthalate resin (EFG-70 manufactured by Bell Polyester Products)
・ O1: Ester oligomer (DIC Polycizer A-55)
(Examples 1-4 and Comparative Examples 1-7)
Materials were kneaded according to the composition (parts by mass) shown in Table 2 to produce resin compositions of Examples 1-4 and Comparative Examples 1-7.

Next, using the resin compositions of Examples 1 to 4 and Comparative Examples 1 to 7, molded bodies of Examples 1 to 4 and Comparative Examples 1 to 7 were molded as test pieces described in the evaluation method.

〔Evaluation results〕
Table 2 shows the evaluation results of the resin compositions and moldings of Examples 1-4 and Comparative Examples 1-7.

As shown in Table 2, the resin compositions of Examples 1-4 exhibit higher MFR and spiral flow than the resin composition of Comparative Example 1, and therefore have higher fluidity. However, the molded bodies of Examples 1 to 4 show comparable Izod impact strength, color tone YI, total light transmittance T% and haze compared to the molded body of Comparative Example 1, and therefore comparable It has strength, color and transparency. From the above, by adding any one or more of the fluidity improvers (A1) to (A4) to PC1, the fluidity of the resin composition was improved to an excellent level, and the resin composition It can be judged that the strength, color tone and transparency of the molded product obtained by molding were still maintained at an excellent level.

Furthermore, from the evaluation results of Examples 1 to 4 and Comparative Examples 2 to 6, the fluidity improvers (A1) to (A4) were compared with PET, O1 and the fluidity improvers (B1) to (B2). It can be judged that the effect of improving the fluidity of the resin composition is large, and the effect of maintaining the strength, color tone and transparency of the molded product obtained by molding the resin composition is the same or large.

Further, from the evaluation results of Examples 1 to 4 and Comparative Example 7, the fluidity improvers (A1) to (A4) had better strength, color tone and transparency of the molded product than the fluidity improver (B3). It can be judged that the effect of maintaining is large.

According to one embodiment of the present invention, it is possible to provide a novel fluidity improver capable of providing a molded article having excellent strength, color tone and transparency and providing a polycarbonate resin composition having excellent fluidity. Therefore, the fluidity improver according to one embodiment of the present invention is suitable as an additive for polycarbonate resins capable of improving molding processability while maintaining the excellent properties inherent in polycarbonate resins. can be used.

Claims (12)

A polyester-polyether glycol copolymer having aromatic polyester units and polyether glycol units,
The polyether glycol units include one or more selected from the group consisting of polypentamethylene ether glycol units, polytetramethylene ether glycol units, polypropylene glycol units, polyethylene glycol units and polyoxymethylene units, and an aromatic group A fluidity improver for polycarbonate resins that does not contain 2. The flow improver of claim 1, further comprising a germanium compound. The fluidity improver according to claim 1, wherein the polyester-polyether glycol copolymer has an IV value in the range of 0.20 to 1.00. The fluidity improver according to claim 1, wherein the polyester-polyether glycol copolymer has an IV value in the range of 0.30 to 0.60. In the polyester-polyether glycol copolymer, when the total of the aromatic polyester unit and the polyether glycol unit is 100% by mass, the aromatic polyester unit is 50% by mass to 90% by mass, and the poly The fluidity improver according to claim 1, wherein the ether glycol units are 10% to 50% by weight. 2. The fluidity improver according to claim 1, wherein the aromatic polyester units include one or more selected from the group consisting of polyethylene terephthalate units, polypropylene terephthalate units and polybutylene terephthalate units. The polyether glycol units are polypentamethylene ether glycol units, polytetramethylene ether glycol units, polypropylene glycol units, and polyethylene in the total 100% by mass of the polyether glycol units contained in the polyester-polyether glycol copolymer. 2. The fluidity improver according to claim 1, comprising 50% by mass or more of one or more selected from the group consisting of glycol units and polyoxymethylene units. The polyester-polyether glycol copolymer has a total of 50% by mass or more of the aromatic polyester units and the polyether glycol units in 100% by mass of all structural units contained in the polyester-polyether glycol copolymer. 2. The flow improver of claim 1, comprising: A resin composition comprising the fluidity improver according to any one of claims 1 to 8 and a polycarbonate-based resin. A resin composition containing 40.0 parts by mass to 99.5 parts by mass of a polycarbonate resin and 0.5 parts by mass to 60.0 parts by mass of a polyester-polyether glycol copolymer as a base resin,
The polyester-polyether glycol copolymer has aromatic polyester units and polyether glycol units,
The polyether glycol units include one or more selected from the group consisting of polypentamethylene ether glycol units, polytetramethylene ether glycol units, polypropylene glycol units, polyethylene glycol units and polyoxymethylene units, and an aromatic group A resin composition that does not contain A molded article obtained by molding the resin composition according to claim 9 . A molded article obtained by molding the resin composition according to claim 10 .