Resin composition, pellet, and molded article

Abstract

To provide a resin composition, a pellet and a molded article excellent in slidability and resistance.SOLUTION: (B) 0.5 to 8 parts by mass of an olefin polymer having a melt mass flow rate (MFRB) of 0.5 to 50. 16kg / 5g, the melt mass flow rate (MFRB) being measured under conditions of a temperature of 190 °C and a load of 2. 10min, with respect to 100 parts by mass of (A), the melt mass flow rate (MFRA) being measured under conditions of a temperature of 190 °C and a load of 2. 16kg, with the ratio (MFRA / MFRB) of the MFRA of (A) to the MFRB of (B) being 0.05 to 5. 0g 10min.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a resin composition, a pellet, and a molded article, and more particularly to a resin composition containing a polyacetal resin as a main component. [Background technology]

[0002] Polyacetal resin is a plastic having excellent mechanical properties, electrical properties, and chemical properties such as chemical resistance, and is used in a wide range of applications. One of the known uses of polyacetal resin is as a sliding member. As an example of using polyacetal resin as a sliding member, Patent Document 1 discloses a polyacetal resin composition obtained by blending 99.8 to 80 parts by weight of polyacetal, 0.1 to 20 parts by weight of polyethylene wax, and 0.1 to 5 parts by weight of silicone oil. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 04-224856 Summary of the Invention [Problem to be solved by the invention]

[0004] Here, there are cases where creep resistance is also required for sliding members, but there is a trade-off between sliding properties and creep resistance, and it has been difficult to achieve both. The present invention has an object to solve the above problems, and to provide a resin composition, pellets, and molded articles that are excellent in sliding properties and creep resistance. [Means for solving the problem]

[0005] In view of the above problems, the present inventors have conducted research and found that the above problems can be solved by blending a predetermined amount of an olefin polymer with a relatively high viscosity polyacetal resin (A). Specifically, the above problems were solved by the following means. [1] (A) Melt mass flow rate (MFR) measured under the conditions of a temperature of 190°C and a load of 2.16 kg A ) is 0.5 to 5 g / 10 min, relative to 100 parts by mass of (A) polyacetal resin, (B) Melt mass flow rate (MFR) measured at a temperature of 190°C and a load of 2.16 kg B 0.5 to 8 parts by mass of an olefin polymer having a molecular weight of 0.5 to 50.0 g / 10 min, MFR of (B) B The MFR of (A) A ratio (MFR A / MFR B ) is 0.05 to 5. [2] (A) Melt mass flow rate (MFR) measured at a temperature of 190°C and a load of 2.16 kg A ) is 0.5 to 5 g / 10 min, relative to 100 parts by mass of (A) polyacetal resin, (B) Melt mass flow rate (MFR) measured at a temperature of 190°C and a load of 2.16 kg B 0.5 to 8 parts by mass of an olefin polymer having a molecular weight of 0.5 to 50.0 g / 10 min, A resin composition, wherein in an injection-molded article formed from the resin composition, the domains derived from the olefin polymer (B) have an aspect ratio of 1 to 10 and a longest diameter of 1 to 30 μm. [3] MFR of (B) above B The MFR of (A) A ratio (MFR A / MFR B ) is 0.8 to 2.0. [4] MFR of (B) above B The resin composition according to any one of [1] to [3], wherein the viscosity is 0.65 to 12.0 g / 10 min. [5] The resin composition according to any one of [1] to [4], further comprising (C) a nitrogen-containing compound. [6] In an injection-molded article formed from the resin composition, the domains derived from the olefin polymer (B) have an aspect ratio of 1 to 10 and a longest diameter of 1 to 30 μm; MFR of (B) B The MFR of (A) A ratio (MFR A / MFR B ) is 0.8 to 2.0, MFR of (B) B is 0.65 to 12.0 g / 10 min, The resin composition according to any one of [1] to [6], further comprising (C) a nitrogen-containing compound. [7] Pellets of the resin composition according to any one of [1] to [6]. [8] A molded article formed from the resin composition according to any one of [1] to [6]. [9] A molded article formed from the pellets described in [7]. [Effects of the Invention]

[0006] The present invention makes it possible to provide a resin composition, pellets, and molded articles that are excellent in sliding properties and creep resistance. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is an explanatory diagram showing the structure of an injection-molded article for measuring creep rupture time. [Figure 2] FIG. 2 is a photograph showing the results of a scanning electron microscope (SEM) of the surface of the injection-molded article in Example 1. [Figure 3] FIG. 3 is a photograph showing the results of a scanning electron microscope (SEM) of the surface of the injection-molded article in Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, an embodiment for carrying out the present invention (hereinafter simply referred to as "the present embodiment") will be described in detail. Note that the present embodiment is an example for explaining the present invention, and the present invention is not limited to only this embodiment. In this specification, the symbol "to" is used to mean that the numerical values ​​before and after it are included as upper and lower limits. "A to B" means that the range is A or more and B or less. In addition, any combination of the upper and lower limit values ​​of the numerical values ​​in this specification is an example of this embodiment. In this specification, various physical properties and characteristic values ​​are those at 23°C unless otherwise specified.

[0009] In this specification, unless otherwise specified, the weight average molecular weight and number average molecular weight are values ​​measured by GPC (gel permeation chromatography) in terms of polystyrene. If the measurement methods, etc. described in the standards shown in this specification change from year to year, they will be based on the standards in effect as of January 1, 2024, unless otherwise specified. If the measurement methods, etc. described in the standards shown in this specification are abolished as of January 1, 2024, they will be based on the standards in effect at the time of abolition.

[0010] The resin composition of the present embodiment has a melt mass flow rate (MFR) measured under the conditions of (A) a temperature of 190°C and a load of 2.16 kg. A (B) Melt mass flow rate (MFR) measured under the conditions of a temperature of 190°C and a load of 2.16 kg for 100 parts by mass of (A) polyacetal resin having a melt mass flow rate (MFR) of 0.5 to 5 g / 10 min B ) is 0.5 to 50.0 g / 10 min, and the (B) contains 0.5 to 8 parts by mass of an olefin polymer having an MFR of 0.5 to 50.0 g / 10 min, B The MFR of (A) A ratio (MFR A / MFR B ) is 0.05 to 5. By adopting such a constitution, a molded article having excellent sliding properties and creep resistance can be obtained. The more the (B) olefin polymer is blended with the (A) polyacetal resin, the more the sliding property tends to improve, but the creep resistance tends to deteriorate. In other words, sliding property and creep resistance are generally in a trade-off relationship. Under such circumstances, in this embodiment, the (A) polyacetal resin is a polyacetal resin containing MFR A As a result, (A) MFR of polyacetal resin was A (B) MFR of olefin polymer B The viscosity was relatively close to that of the polyacetal resin (A), and the olefin polymer (B) was dispersed appropriately in the polyacetal resin (A). In particular, the smaller and rounder the dispersed particle diameter of the olefin polymer is, the less stress is concentrated at the interface with the polyacetal resin (A), and the creep resistance tends to be improved. However, in this embodiment, the MFR B MFR A ratio (MFR A / MFR B It is presumed that by adjusting the ratio of (B) to (C), the olefin polymer can be dispersed to a suitable degree, thereby improving both the sliding properties and creep resistance.

[0011] Hereinafter, the embodiments of the present invention will be described in detail. However, the explanation of the constituent elements described below is an example of an embodiment of the present invention, and the present invention is not limited to these contents.

[0012] <(A) Polyacetal resin> The resin composition of this embodiment has (A) a melt mass flow rate (MFR) measured under conditions of a temperature of 190°C and a load of 2.16 kg. A ) is 0.5 to 5 g / 10 min.

[0013] The melt mass flow rate (MFR) of the polyacetal resin (A) used in this embodiment was measured under the conditions of a temperature of 190°C and a load of 2.16 kg. A) is 0.5 to 5 g / 10 min. By making it equal to or more than the lower limit, the handling property in the extrusion step tends to be excellent. On the other hand, by making it equal to or less than the upper limit, the creep resistance tends to be further improved. A is preferably 0.8 g / 10 min or more, more preferably 1.0 g / 10 min or more, even more preferably 1.5 g / 10 min or more, still more preferably 2 g / 10 min or more, and is preferably less than 5 g / 10 min, more preferably 4.5 g / 10 min or less, even more preferably 4 g / 10 min or less, still more preferably 3.5 g / 10 min or less, and even more preferably 3 g / 10 min or less. The MVR is measured according to the description in the Examples below. When the resin composition of the present embodiment contains two or more types of (A) polyacetal resins, the MVR of each (A) polyacetal resin is A is multiplied by the mass fraction of each (A) polyacetal resin, and the sum is taken as the weighted average value.

[0014] (A) Polyacetal resin has the above MFR A As long as the above condition is satisfied, the type and the like of the copolymer are not particularly limited, and the copolymer may be a homopolymer containing only divalent oxymethylene groups as constituent units, or a copolymer containing divalent oxymethylene groups and divalent oxyalkylene groups having 2 to 6 carbon atoms as constituent units.

[0015] Examples of the oxyalkylene group having 2 to 6 carbon atoms include an oxyethylene group, an oxypropylene group, and an oxybutylene group.

[0016] In the (A) polyacetal resin, the proportion of oxyalkylene groups having 2 to 6 carbon atoms in the total number of moles of oxymethylene groups and oxyalkylene groups having 2 to 6 carbon atoms is not particularly limited, and may be 0.5 to 10 mol %.

[0017] To produce the polyacetal resin (A), trioxane is typically used as the main raw material. To introduce oxyalkylene groups having 2 to 6 carbon atoms into the polyacetal resin (A), a cyclic formal or a cyclic ether can be used. Specific examples of cyclic formals include 1,3-dioxolane, 1,3-dioxane, 1,3-dioxepane, 1,3-dioxocane, 1,3,5-trioxepane, and 1,3,6-trioxocane. Specific examples of cyclic ethers include ethylene oxide, propylene oxide, and butylene oxide. To introduce oxyethylene groups into the polyacetal resin (A), 1,3-dioxolane can be used as the main raw material. To introduce oxypropylene groups, 1,3-dioxane can be used as the main raw material. To introduce oxybutylene groups, 1,3-dioxepane can be used as the main raw material. In addition, it is preferable that the amount of hemiformal terminal groups, formyl terminal groups, and terminal groups unstable to heat, acid, or base is small in (A) polyacetal resin. Here, the hemiformal terminal groups are represented by -OCHOH, and the formyl terminal groups are represented by -CHO.

[0018] In addition to the above, the polyacetal resin (A) that can be used includes the polyacetal resins (A) described in paragraphs 0018 to 0043 of JP-A No. 2015-074724, the contents of which are incorporated herein by reference. The (A) polyacetal resin used in this embodiment may be a recycled (A) polyacetal resin product (including recovered products, material recycled products, chemical recycled products, etc.), a rejected product, or scrap material generated when molding a molded product from a resin composition.

[0019] The resin composition of this embodiment preferably contains the (A) polyacetal resin in a proportion of 80 mass % or more of the resin composition, more preferably 85 mass % or more, even more preferably 90 mass % or more, still more preferably 95 mass % or more, even more preferably 97 mass % or more, and may contain 99 mass % or more. The upper limit is preferably 99.9 mass % or less. The resin composition of the present embodiment may contain only one type of (A) polyacetal resin, or may contain two or more types. When two or more types are contained, the total amount is preferably in the above range.

[0020] <(B) Olefin polymer> The resin composition of this embodiment has a melt mass flow rate (MFR) measured under conditions of a temperature of 190°C and a load of 2.16 kg. B ) is 0.5 to 50.0 g / 10 min. By including such an olefin polymer (B) together with the polyacetal resin (A), it is possible to improve both the creep resistance and the creep resistance of the resulting molded article.

[0021] The melt mass flow rate (MFR) of the olefin polymer (B) used in this embodiment was measured under the conditions of a temperature of 190°C and a load of 2.16 kg. B ) is 0.5 to 50.0 g / 10 min. By making it equal to or greater than the lower limit, the domain diameter in the (A) polyacetal resin tends to be controlled to be smaller. On the other hand, by making it equal to or less than the upper limit, the (A) polyacetal resin tends to have a round shape and the creep resistance tends to be further improved. The MFR of the (B) olefin polymer Bis preferably 0.65 g / 10 min or more, more preferably 0.8 g / 10 min or more, and even more preferably 1.2 g / 10 min or more, and is preferably 45 g / 10 min or less, more preferably 40 g / 10 min or less, even more preferably 30 g / 10 min or less, still more preferably 12 g / 10 min or less, even more preferably 10 g / 10 min or less, and even more preferably 5 g / 10 min or less. The MVR is measured according to the description in the Examples below. When the resin composition of the present embodiment contains two or more types of (B) olefin polymers, the MVR of each (B) olefin polymer is B is multiplied by the mass fraction of each (B) olefin polymer, and the sum is calculated as a weighted average value.

[0022] The (B) olefin polymer is an olefin homopolymer and / or a copolymer using an olefin as a monomer, and may further be modified with an acid or the like. Examples of the olefin (olefin monomer) constituting the olefin polymer include ethylene, propylene, 1-butene, 3-methyl-1-butene, 1-pentene, 3-methyl-1-pentene, 4-methyl-1-pentene, 1-hexene, and 1-octene. Therefore, examples of the olefin polymer (B) include ethylene polymers, propylene polymers, 1-butene polymers, 1-hexene polymers, and 4-methyl-1-pentene polymers. These polymers may be used alone or in combination of two or more. In other words, the olefin polymer may be a mixture of various polymers.

[0023] Examples of ethylene polymers include ethylene homopolymers (polyethylene) and copolymers of ethylene with other monomers (ethylene copolymers). Examples of ethylene copolymers include ethylene-propylene copolymers, ethylene-1-butene copolymers, ethylene-1-pentene copolymers, ethylene-1-hexene copolymers, ethylene-1-octene copolymers, and ethylene-4-methyl-1-pentene copolymers.

[0024] Propylene-based polymers include, for example, propylene homopolymers (polypropylene) and copolymers of propylene with other monomers (propylene copolymers). Propylene copolymers include propylene-ethylene copolymers, propylene-1-butene copolymers, propylene-1-pentene copolymers, and propylene-1-octene copolymers.

[0025] Furthermore, among the above, examples of the 1-butene polymer include 1-butene homopolymer (poly-1-butene), examples of the 1-hexene polymer include 1-hexene homopolymer (poly-1-hexene), and examples of the 4-methyl-1-pentene polymer include 4-methyl-1-pentene homopolymer (poly-4-methyl-1-pentene).

[0026] Furthermore, the olefin polymer may contain structural units derived from monomers other than olefins, provided that the objectives of the present invention are not impaired. Examples of monomers other than olefins include unsaturated carboxylic acids (acrylic acid, methacrylic acid, etc.), unsaturated carboxylic acid esters (methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, dimethyl maleate, diethyl maleate, etc.), and vinyl esters (vinyl acetate, vinyl propionate, fumaric acid, maleic anhydride, maleic acid monoester, etc.). These may be used alone or in combination of two or more. Incidentally, even if the olefin polymer contains structural units derived from monomers other than olefin, the amount is preferably 5% by mass or less (usually 0.001% by mass or more) of the total number of structural units.

[0027] (B) The olefin polymer is preferably an ethylene polymer, a propylene polymer, or an ethylene-propylene copolymer. I wish.

[0028] The number average molecular weight (Mn) of the (B) olefin polymer is not particularly limited. The number average molecular weight is, for example, preferably 10,000 to 1,000,000, more preferably 12,000 to 70,000, and even more preferably 15,000 to 50,000. The weight average molecular weight (Mw) of the (B) olefin polymer is not particularly limited. The weight average molecular weight is, for example, preferably 10,000 to 1,000,000, more preferably 30,000 to 250,000, and even more preferably 150,000 to 200,000. The molecular weight distribution (Mw / Mn) of the (B) olefin polymer is not particularly limited. The molecular weight distribution is, for example, preferably 1 to 8, more preferably 1 to 5, and even more preferably 1 to 4.

[0029] The molecular weight measurement device and conditions are as follows. (B) Molecular weight measurement device for olefin polymer: Gel permeation chromatography (Tosoh Corporation, GPC-8121 / HT) Molecular weight measurement conditions: 1,2,4-trichlorobenzene (2,6-di-t-butyl-4-methylphenol BHT 0.05 wt% added) is used as the eluent, and two TSKgel-GMHHR-H(20)HT columns are used connected in series. Polystyrene is used as the standard sample for the calibration curve, and measurements are performed at a temperature of 140°C and a flow rate of 1 ml / min.

[0030] The (B) olefin polymer may be an acid-modified olefin polymer, and the acid-modified olefin polymer is preferably an olefin polymer modified with a carboxylic acid. It is presumed that the sliding properties and creep resistance in this embodiment are governed by the ratio of MFR of (A) polyacetal resin to (B) olefin polymer, and are not significantly affected by the degree of acid modification.

[0031] The olefin skeleton of the acid-modified olefin polymer may be either a homopolymer or a copolymer.

[0032] Examples of carboxylic acids that modify polyolefins include unsaturated carboxylic acids, such as maleic acid, fumaric acid, acrylic acid, crotonic acid, methacrylic acid, itaconic acid, and the acid anhydrides of these acids. Of these, it is preferable to use maleic anhydride, maleic acid, and acrylic acid.

[0033] The acid-modified polyolefin is preferably a polyolefin modified with maleic anhydride, and particularly preferably maleic anhydride-modified polyethylene.

[0034] The acid-modified olefin polymer may be produced by a conventional method, for example, by graft polymerizing an unsaturated carboxylic acid onto the polyolefin under conventional conditions, for example, stirring under heating, or may be a commercially available product, such as a polymer obtained by grafting maleic anhydride onto HDPE, LLDPE, PS, or PP. Examples of commercially available products include maleic anhydride-modified polyethylene such as OREVAC OE808 (manufactured by Arkema K.K.); maleic anhydride-modified propylene-ethylene copolymers such as Tafmer MA8510 (manufactured by Mitsui Chemicals, Inc.) and MP0620 (manufactured by Mitsui Chemicals, Inc.); maleic anhydride-modified ethylene-1-butene copolymers such as Tafmer MH7020 (manufactured by Mitsui Chemicals, Inc.); and maleic anhydride-modified polypropylenes such as Admer QE060 (manufactured by Mitsui Chemicals, Inc.).

[0035] The content of the (B) olefin polymer in the resin composition of this embodiment is, relative to 100 parts by mass of the (A) polyacetal resin, 0.5 parts by mass or more, preferably 0.7 parts by mass or more, more preferably 1.1 parts by mass or more, even more preferably 1.5 parts by mass or more, even more preferably 2.0 parts by mass or more, even more preferably 2.5 parts by mass or more, and 8 parts by mass or less, preferably 7 parts by mass or less, more preferably 4.5 parts by mass or less, even more preferably 4 parts by mass or less, even more preferably 3.5 parts by mass or less. By setting the content at or above the lower limit, sliding properties tend to be further improved. On the other hand, by setting the content at or below the upper limit, creep resistance tends to be further improved. The resin composition of the present embodiment may contain only one type of (B) olefin polymer, or may contain two or more types. When two or more types are contained, the total amount is preferably in the above range.

[0036] <(C) Nitrogen-containing compounds> The resin composition of this embodiment may contain (C) a nitrogen-containing compound. By containing (C) a nitrogen-containing compound, a molded article having even better sliding properties can be obtained. The nitrogen-containing compound (C) is preferably at least one selected from dihydrazone compounds, dihydrazide compounds, urea compounds, and melamine compounds, and more preferably urea compounds and / or melamine compounds. Urea compounds and melamine compounds are nitrogen-containing compounds with relatively low reactivity, and are thought to be able to make the dispersion diameter of the olefin polymer (B) an appropriate size.

[0037] For the dihydrazone compound, please refer to the description in paragraphs 0015 to 0023 of JP 2022-015084 A, the contents of which are incorporated herein by reference.

[0038] The hydrazide compound is not particularly limited as long as it has two or more hydrazide groups. The hydrazide compound preferably has a molecular weight of 200 to 1000. The hydrazide compound is preferably a dihydrazide compound or a trihydrazide compound, and more preferably a dihydrazide compound. Examples of dihydrazide compounds include aliphatic dihydrazide compounds and aromatic dihydrazide compounds.

[0039] Examples of the aliphatic dihydrazide compounds include carbodihydrazide, oxalic acid dihydrazide, malonic acid dihydrazide, succinic acid dihydrazide, glutaric acid dihydrazide, adipic acid dihydrazide, azelaic acid dihydrazide, sebacic acid dihydrazide, dodecanedioic acid dihydrazide (1,12-dodecanedicarbohydrazide), 1,18-octadecanedicarbohydrazide, stearic acid dihydrazide, maleic acid dihydrazide, fumaric acid dihydrazide, and 7,11-octadecadiene-1,18-dicarbohydrazide.

[0040] Examples of aromatic dihydrazide compounds include isophthalic acid dihydrazide, terephthalic acid dihydrazide, 1,5-naphthalenedicarbohydrazide, 1,8-naphthalenedicarbohydrazide, 2,6-naphthalenedicarbohydrazide, 4,4'-oxybisbenzenesulfonylhydrazide, and 1,5-diphenylcarbonohydrazide.

[0041] The hydrazide compound used in this embodiment is preferably represented by the following formula (1): Formula (1) [ka] In the above formula (1), R 1 represents an aliphatic hydrocarbon group having 2 to 18 carbon atoms, an alicyclic hydrocarbon group having 6 to 10 carbon atoms, or an aromatic hydrocarbon group having 6 to 10 carbon atoms; R 2 ~R 5 each independently represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms; R 2 and R 3 , and ,R4 and R 5 may be bonded to each other to form a ring.

[0042] In formula (1), R 1 represents an aliphatic hydrocarbon group having 2 to 18 carbon atoms, an alicyclic hydrocarbon group having 6 to 10 carbon atoms, or an aromatic hydrocarbon group having 6 to 10 carbon atoms, and is preferably an aliphatic hydrocarbon group having 4 to 18 carbon atoms, and more preferably an aliphatic hydrocarbon group having 8 to 12 carbon atoms. The aliphatic hydrocarbon group may be saturated or unsaturated, linear or branched, and may, for example, be an alkylene group such as butylene, pentylene, hexylene, heptylene, octylene, nonylene, decylene, undecylene, dodecylene, tridecylene, tetradecylene, pentadecylene, hexadecylene, heptadecylene, octadecylene, or nonadecylene.

[0043] The alicyclic hydrocarbon group may be saturated or unsaturated. Examples of the alicyclic hydrocarbon group include a cycloalkylene group having 6 to 10 carbon atoms. Examples of the cycloalkylene group include a cyclohexylene group.

[0044] Examples of the aromatic hydrocarbon group include arylene groups such as phenylene and naphthylene groups. At least some of the carbon atoms of the aromatic hydrocarbon group may be bonded with a substituent, such as a halogen group, a nitro group, or an alkyl group having 1 to 20 carbon atoms.

[0045] In formula (1), R 2 ~R 5 are each independently preferably a hydrogen atom, a methyl group or an ethyl group, more preferably a hydrogen atom.

[0046] The urea compound used in this embodiment means a compound having a -(HN)2C(=O) structure, and the type thereof is not particularly specified. The urea compound used in this embodiment preferably contains a compound having a skeleton represented by formula (N). By having such a structure, the generation of formaldehyde can be more significantly suppressed when the polyacetal resin (A) is retained in a molding machine for a long period of time. [ka] Here, the compound having a skeleton represented by formula (N) is intended to include not only the compound represented by formula (N) (ethylene urea), but also compounds having a structure in which the hydrogen atoms bonded to the nitrogen atoms and / or carbon atoms forming the cyclic structure of formula (N) are substituted with a substituent. When the compound has a substituent, it is preferable that the hydrogen atoms bonded to the carbon atoms are substituted with a substituent. Examples of the substituent include an oxygen atom (=O), a urea group, and a (methyl group).

[0047] The molecular weight of the urea compound used in this embodiment is preferably 60 or more, and more preferably 86 or more. The upper limit is preferably 500 or less, more preferably 300 or less, and even more preferably 200 or less. Examples of the urea compound include urea, ethyleneurea, allantoin, and biurea, and it is preferable that the compound contains ethyleneurea and / or allantoin, and it is more preferable that the compound contains ethyleneurea.

[0048] The melamine compound used in this embodiment is a compound (melamine) having a triazine ring at the center of its structure and three amino groups around it, or a derivative thereof, and examples thereof include melamine, melamine cyanurate, acetoguanamine, benzoguanamine, melamine condensates (melam, melem, melon), and methylolmelamine, with melamine being a preferred compound among them.

[0049] The content of the (C) nitrogen-containing compound in the resin composition of this embodiment is preferably 0.01 parts by mass or more, more preferably 0.05 parts by mass or more, and even more preferably 0.07 parts by mass or more, relative to 100 parts by mass of the (A) polyacetal resin. By ensuring that the content is equal to or greater than the above lower limit, the resulting molded article tends to have better sliding properties. Furthermore, the content of the (C) nitrogen-containing compound in the resin composition of this embodiment is preferably 5 parts by mass or less, more preferably 2 parts by mass or less, even more preferably 1 part by mass or less, even more preferably 0.7 parts by mass or less, and even more preferably 0.3 parts by mass or less, relative to 100 parts by mass of the (A) polyacetal resin. The resin composition of the present embodiment may contain only one type of (C) nitrogen-containing compound, or may contain two or more types. When two or more types are contained, the total amount is preferably in the above range.

[0050] In this embodiment, the ratio (B) / (C) of the olefin polymer (B) to the nitrogen-containing compound (C) is preferably from 1 to 50. By setting it within this range, the sliding properties tend to be further improved. The (B) / (C) is preferably 2 or more, more preferably 5 or more, and even more preferably 7 or more, and is preferably 40 or less, and may be 25 or less, or may be 15 or less.

[0051] <(D) Polyolefin wax> The resin composition of this embodiment preferably contains (D) polyolefin wax. In this embodiment, for compounds that fall under both (B) olefin polymer and (D) polyolefin wax, those with a melt mass flow rate (MFR) of more than 50.0 g / 10 min measured at a temperature of 190°C and a load of 2.16 kg are classified as (D) polyolefin wax, while others are classified as (B) olefin polymer. By including (D) polyolefin wax, a molded product with even better sliding properties can be obtained. (D) Examples of the polyolefin wax include waxes such as polyethylene, polypropylene, polybutylene, α-olefin polymers, ethylene-propylene copolymers, and ethylene-butene copolymers, with polyethylene wax being preferred and low-density polyethylene wax being more preferred. The polyolefin wax (D) used in this embodiment is preferably an acid-modified olefin polymer wax. The acid value of the acid-modified (D) polyolefin wax is preferably 0.8 mgKOH / g or more, more preferably 1.2 mgKOH / g or more, even more preferably 5 mgKOH / g or more, even more preferably 10 mgKOH / g or more, even more preferably 20 mgKOH / g or more, and even more preferably 25 mgKOH / g or more, and may actually be 150 mgKOH / g or less, or 110 mgKOH / g or less. The acid value of the (D) polyolefin wax is measured in accordance with JIS K 0070-1992.

[0052] The viscosity average molecular weight of the polyolefin wax (D) used in this embodiment is preferably 1,000 or more, and preferably 20,000 or less, and more preferably 15,000 or less. By setting the viscosity average molecular weight at or above the lower limit, excellent handleability in the extrusion process is achieved. On the other hand, by setting the viscosity average molecular weight at or below the upper limit, the dispersibility of the polyolefin wax (D) in the resulting molded product tends to be improved.

[0053] The (D) polyolefin wax preferably has a carboxyl group and / or an acid anhydride group thereof, more preferably has a maleic acid group and / or a maleic anhydride group, and even more preferably has a maleic anhydride group. (D) The density of polyolefin wax is 700 kg / m 3 It is preferable that the saturation is 800 kg / m or more. 3 More preferably, it is 900 kg / m or more. 3 More preferably, it is 1100 kg / m or more. 3It is preferable that the saturation is 1000 kg / m or less. 3 More preferably, it is: The polyolefin wax (D) preferably has a melting point of 60 to 145°C.

[0054] (D) Commercially available polyolefin waxes that can be used include, for example, Mitsui Hiwax 210MP, 220MP, 310MP, 320MP, 405MP, 405MPF, 4051E, 4052E, 4202E, 4252E, 1105A, and 2203A manufactured by Mitsui Chemicals, Inc., and Diakarna 30M manufactured by Mitsubishi Chemical Corporation.

[0055] In the present embodiment, the ratio (D) / (C) of the polyolefin wax (preferably an acid-modified olefin polymer wax) to the nitrogen-containing compound (C) is preferably 1 to 20. By setting the ratio within this range, the sliding properties tend to be further improved. The (D) / (C) ratio is preferably 3 or more, more preferably 5 or more, and even more preferably 7 or more, and is preferably 15 or less, and may be 12 or less.

[0056] The content of (D) polyolefin wax in the resin composition of this embodiment is preferably 0.005 parts by mass or more, more preferably 0.01 parts by mass or more, even more preferably 0.05 parts by mass or more, even more preferably 0.5 parts by mass or more, and even more preferably 0.7 parts by mass or more, per 100 parts by mass of (A) polyacetal resin. By ensuring that the content is above the lower limit, sliding properties tend to be further improved. Furthermore, the content of (D) polyolefin wax in the resin composition of this embodiment is 5 parts by mass or less, preferably 3 parts by mass or less, more preferably 2 parts by mass or less, and even more preferably 1.5 parts by mass or less, per 100 parts by mass of (A) polyacetal resin. The resin composition of the present embodiment may contain only one type of (D) polyolefin wax, or may contain two or more types. When two or more types are contained, the total amount is preferably in the above range.

[0057] <(E) Calcium Carbonate> The resin composition of the present embodiment preferably contains (E) calcium carbonate. (E) Calcium carbonate serves as a stress relaxant and can more effectively suppress the decrease in elastic modulus.

[0058] In this embodiment, the average primary particle size of the calcium carbonate (E) is preferably 0.30 μm or less, more preferably 0.20 μm or less, even more preferably 0.10 μm or less, even more preferably 0.08 μm or less, even more preferably 0.06 μm or less, and even more preferably 0.04 μm or less. By setting the average primary particle size to the above upper limit or less, there is a tendency to more effectively prevent the particles from becoming the starting point for fracture of the obtained molded article. Furthermore, the average particle size of the calcium carbonate (E) is preferably 0.001 μm or more, more preferably 0.005 μm or more, and even more preferably 0.01 μm or more.

[0059] In this embodiment, (E) calcium carbonate has a specific surface area of ​​100 m 2 / g or less, and 2 / g or less is more preferable, and 70m 2 / g or less is more preferable, and 60m 2 / g or less is more preferable, and 55m 2 / g or less is even more preferable, 2 / g or less. By making the specific surface area of ​​the calcium carbonate (E) equal to or less than the upper limit, the handling property of the calcium carbonate itself tends to be excellent. 2 / g or more, and 2 / g or more is more preferable, and 10m 2 / g or more, and 2 By making the content equal to or greater than the lower limit, the effects of the present invention tend to be more effectively exhibited with a small amount added.

[0060] The content of (E) calcium carbonate in the resin composition of this embodiment is preferably 0.01 parts by mass or more, more preferably 0.05 parts by mass or more, and even more preferably 0.1 parts by mass or more, relative to 100 parts by mass of the (A) polyacetal resin. By ensuring that the content is at least the above-mentioned lower limit, the resin composition tends to have excellent feedability during production. Furthermore, the content of (E) calcium carbonate in the resin composition of this embodiment is preferably 10 parts by mass or less, more preferably 5 parts by mass or less, even more preferably 2 parts by mass or less, even more preferably 1 part by mass or less, and even more preferably 0.7 parts by mass or less, relative to 100 parts by mass of the (A) polyacetal resin. By ensuring that the content is at most the above-mentioned upper limit, the (E) calcium carbonate tends to be effectively prevented from becoming a starting point for fracture of a molded article.

[0061] <(F) Nucleating agent> The resin composition of the present embodiment may contain a nucleating agent to adjust the crystallization rate. The type of nucleating agent is not particularly limited, but may be an inorganic nucleating agent or an organic nucleating agent, with inorganic nucleating agents being more preferred. Examples of inorganic nucleating agents include talc, boron nitride, mica, kaolin, barium sulfate, sodium phosphate, silicon nitride, and molybdenum disulfide. Among these, talc, barium sulfate, sodium phosphate, and boron nitride are preferred, and talc is more preferred because it tends to increase the rigidity of the resin composition.

[0062] The organic nucleating agent is preferably an organic alkali metal salt, more preferably an alkali metal salt of an aromatic carboxylic acid or a fatty acid, and even more preferably an alkali metal salt (preferably a sodium salt or potassium salt, more preferably a sodium salt) of a fatty acid (preferably a fatty acid having 5 to 50 carbon atoms). Specific examples of the organic nucleating agent include ionomer, sodium benzoate, sodium palmitate, sodium stearate, sodium behenate, and sodium montanate, of which sodium stearate, sodium behenate, and sodium montanate are more preferred, and sodium montanate is even more preferred because it tends to provide a resin composition with a good balance between rigidity and toughness. The acid value of the nucleating agent used in this embodiment is preferably 10 mg / 1 g-KOH or less, and is preferably 0 mg / 1 g-KOH or more. The acid value is measured in accordance with JIS K 0070-1992.

[0063] When the resin composition of this embodiment contains a nucleating agent (F), the content thereof is preferably 0.01 parts by mass or more, more preferably 0.05 parts by mass or more, and even more preferably 0.1 parts by mass or more, per 100 parts by mass of the polyacetal resin (A). Depending on the application, for example, in applications where mold releasability is particularly required, the content may be more preferably 0.15 parts by mass or more, or even 0.2 parts by mass or more. By ensuring that the content is above the above-mentioned lower limit, the mold releasability and mechanical strength of the molded article tend to be improved. The upper limit of the content is preferably 5 parts by mass or less, more preferably 3 parts by mass or less, even more preferably 1 part by mass or less, and even more preferably 0.7 parts by mass or less, per 100 parts by mass of the total polyacetal resin (A).

[0064] <Other ingredients> The resin composition of this embodiment may contain known additives and fillers as long as they do not impair the objectives of the present invention. Examples of additives and fillers that can be used in this embodiment include known thermoplastic polymers other than (A) polyacetal resin and (B) olefin polymer, polymer components of acid-modified polymers, weathering agents, formaldehyde scavengers, inorganic particles, antioxidants (hindered amines, hindered phenols, etc.), heat stabilizers, colorants, nucleating agents, plasticizers, fluorescent brighteners, mold release agents, antistatic agents, UV absorbers, flame retardants, and flame retardant aids. The total content of the polymer components and additives is preferably less than 10% by mass, more preferably less than 7% by mass, even more preferably less than 5% by mass, and even more preferably less than 3% by mass, based on 100% by mass of the resin composition, and may even be less than 1% by mass.

[0065] The resin composition of this embodiment is prepared so that the total of (A) the polyacetal resin, (B) the olefin polymer, and other components blended as necessary, is 100% by mass. In the resin composition of the present embodiment, the total of (A) polyacetal resin, (B) olefin polymer, (C) nitrogen-containing compound, (D) polyolefin wax, (E) calcium carbonate, and (F) nucleating agent preferably accounts for 90 mass% or more of the resin composition, more preferably 95 mass% or more, even more preferably 97 mass% or more, and even more preferably 99 mass% or more.

[0066] <Physical properties of resin composition> The resin composition of this embodiment has an MFR of (B). B MFR of (A) A ratio (MFR A / MFR B) is 0.05 to 5. By making it equal to or greater than the lower limit, the aspect ratio of the (B) olefin polymer present in the (A) polyacetal resin becomes smaller, stress concentration at the interface can be alleviated, and creep resistance tends to be further improved. On the other hand, by making it equal to or less than the upper limit, the dispersed diameter of the (B) olefin polymer becomes smaller, and stress concentration can be alleviated, and creep resistance tends to be further improved. The ratio (MFR A / MFR B The lower limit of ) is preferably 0.1 or more, more preferably 0.2 or more, even more preferably 0.4 or more, even more preferably 0.6 or more, and even more preferably 0.8 or more, and is 4 or less, preferably 3.5 or less, more preferably 3.0 or less, even more preferably 2.5 or less, and even more preferably 2.0 or less.

[0067] The resin composition of the present embodiment preferably has excellent sliding properties. The resin composition of this embodiment was molded into a cylindrical thrust test piece with a contact area of ​​2 cm 2 When measured at a temperature of 23°C in accordance with the thrust ring friction and wear test specified in JIS K7218 Method A, the limiting PV value (MPa cm / s) is preferably 3.0 MPa cm / s or more, more preferably 5.0 MPa cm / s or more, even more preferably 7.0 MPa cm / s or more, even more preferably 8.0 MPa cm / s or more, and even more preferably 9.0 MPa cm / s or more. There is no particular upper limit to the limiting PV value, but a practical value is, for example, 20.0 MPa cm / s or less. The limiting PV value is measured as described in the Examples below.

[0068] The resin composition of this embodiment preferably has excellent creep resistance. Specifically, when molded into a dumbbell-shaped test piece as shown in Figure 1 and subjected to a stress of 40 MPa at 23°C, the creep rupture time is preferably 21 hours or more, more preferably 30 hours or more, more preferably 80 hours or more, even more preferably 85 hours or more, and even more preferably 100 hours or more. There is no particular upper limit to the creep rupture time, but a practical upper limit is 500 hours or less.

[0069] When the resin composition of this embodiment is molded into a product, it is preferable that small, round olefin polymer domains are formed. The presence of these domains can achieve good sliding properties and creep resistance. That is, to achieve good creep resistance, it is desirable that the dispersion diameter of the additive containing the olefin polymer (B) is small and that the aspect ratio of the dispersion is close to 1. However, to improve sliding properties, it is better that the major axis of the dispersion is relatively long. Specifically, in an injection-molded article formed from the resin composition of this embodiment, the domains derived from the olefin polymer (B) preferably have an aspect ratio of 1 to 10 and a longest diameter of 1 to 30 μm. By adopting such a configuration, a molded article having superior sliding properties and creep resistance can be obtained. The aspect ratio is preferably 9 or less, more preferably 8 or less, even more preferably 5 or less, even more preferably 4 or less, and still more preferably 3.4 or less. Furthermore, the required performance is sufficiently satisfied even if the lower limit of the aspect ratio is, for example, 1.5 or more, 2.0 or more, 2.2 or more, or 2.3 or more. The longest diameter of the domain is preferably 3 μm or more, more preferably 5 μm or more, even more preferably 10 μm or more, and even more preferably 14 μm or more, and is preferably 28 μm or less, more preferably 27 μm or less, and even more preferably 26 μm or less. The aspect ratio and the longest domain diameter are measured according to the description in the Examples section below.

[0070] <Method of manufacturing resin composition> The resin composition of this embodiment can be easily prepared by a known method commonly used for preparing conventional thermoplastic resin compositions. For example, (1) a method in which all components constituting the resin composition are mixed, fed into an extruder, and melt-kneaded to obtain a pellet-shaped resin composition, (2) a method in which some of the components constituting the resin composition are fed through a main feed port of an extruder and the remaining components are fed through a side feed port, and melt-kneaded to obtain a pellet-shaped resin composition, or (3) a method in which pellets of different compositions are prepared by extrusion or the like, and the pellets are mixed to obtain a resin composition having a predetermined composition, etc., can be employed. In this embodiment, some of the components may be prepared in advance as a masterbatch, and then melt-kneaded with the remaining components. Examples of the kneading machine include a kneader, a Banbury mixer, an extruder, etc. There are no particular limitations on the various conditions and devices for mixing and kneading, and they may be appropriately selected from any conventionally known conditions. Kneading is preferably carried out at a temperature above the melting point of the (A) polyacetal resin, specifically above the melting point of the (A) polyacetal resin (generally 180°C or higher).

[0071] <Molded products> The molded article of this embodiment is formed from the resin composition or pellets of this embodiment. The pellets obtained by pelletizing the resin composition of this embodiment are molded into a molded article by various molding methods. Alternatively, a resin composition melt-kneaded in an extruder can be directly molded into a molded article without going through pelletization. The shape of the molded article is not particularly limited and can be appropriately selected depending on the application and purpose of the molded article. Examples of the shape of the molded article include plate-like, plate-like, rod-like, sheet-like, film-like, cylindrical, ring-like, circular, elliptical, gear-like, polygonal, irregular-shaped, hollow, frame-like, box-like, and panel-like shapes. The molded article of this embodiment may be a finished product or a part.

[0072] The method for molding the molded article is not particularly limited, and any conventionally known molding method can be used, such as injection molding, injection compression molding, extrusion molding, profile extrusion, transfer molding, blow molding, gas-assisted blow molding, blow molding, extrusion blow molding, IMC (in-mold coating molding), rotational molding, multilayer molding, two-color molding, insert molding, sandwich molding, foam molding, and pressure molding.

[0073] The resin composition of the present embodiment is particularly suitable for use in forming a sliding member to be used in an environment where a load is continuously applied, and therefore, a molded article formed from the resin composition of the present embodiment is preferably used as a sliding member (sliding part). Specific examples of sliding members include gears, rotating shafts, bearings, various gears, cams, end face materials for mechanical seals, valve seats for valves, sealing members such as V-rings, rod packings, piston rings, and rider rings, as well as sliding members such as rotating shafts, rotating sleeves, pistons, impellers, and rollers for compressors, all of which are intended to meet the high quality demands of electrical and electronic equipment, office equipment, vehicles (automobiles), industrial equipment, and the like. [Example]

[0074] The present invention will be explained in more detail below with reference to examples. The materials, amounts used, ratios, processing details, processing procedures, etc. shown in the following examples can be appropriately changed without departing from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below. If the measuring instruments used in the examples are difficult to obtain due to discontinuation or the like, measurements can be made using other instruments with equivalent performance.

[0075] 1.Raw materials The following raw materials were used: [Table 1]

[0076] The structure of the above melamine is as follows: [ka]

[0077] <Melt Mass Flow Rate (MFR)> The melt mass flow rates (MFR) of the resins ((A) polyacetal resin and (B) polyolefin polymer) were measured at 190°C under a load of 2.16 kg in accordance with STM-D1238. The unit is g / 10 min.

[0078] 2. Examples 1 to 7 and Comparative Examples 1 to 6 <Production of Resin Composition (Pellets)> The components shown in Table 1 were mixed uniformly in the proportions (proportions of each component are in parts by mass) shown in Tables 2 and 3 using a Super Mixer manufactured by Kawada Manufacturing Co., Ltd. The resulting mixture was melt-shear mixed using a vented twin-screw extruder ("TEM26SS" manufactured by Shibaura Machine Co., Ltd.) at a cylinder temperature of 190°C, a screw rotation speed of 144 rpm, and a discharge rate of 10 kg / hour to produce pellets of the resin composition.

[0079] <Limit PV value> The pellets obtained above were injection molded using an SE30DUZ (manufactured by Sumitomo Heavy Industries, Ltd.) with a screw diameter of 32 mm at a cylinder temperature of 195°C and a mold temperature of 80°C, and a thrust wear test was carried out using cylindrical thrust test pieces. A thrust friction and wear test was conducted on a cylindrical thrust test piece at a linear velocity of 10 cm / s, with the surface pressure increased every 3 minutes to 3 kg, 5 kg, 10 kg, and then 5 kg, with each increase being made in increments of 5 kg. The product of the surface pressure and velocity one level below at which the specimen fused due to frictional heat was taken as the limiting PV value (unit: MPa·cm / s).

[0080] <Creep rupture time> The creep rupture time at a stress of 40 MPa and a temperature of 23°C was measured as follows. The pellets obtained above were heat-treated in a hot air circulation dryer at a temperature of 80°C for 4 hours. Next, the dried pellets were molded into dumbbell-shaped test pieces as shown in FIG. 1 using an injection molding machine under conditions of a cylinder temperature of 195° C. and a mold temperature of 80° C., and a creep test was carried out. A creep test was carried out on a dumbbell-shaped specimen at 23°C with a stress of 40 MPa, and the time when the specimen broke or when the deformation reached the mechanical limit of the device was measured as the creep rupture time. The creep rupture time was measured in hours.

[0081] <Domain diameter of additive> The dumbbell test piece obtained above was observed under a scanning electron microscope. Specifically, the domain diameter of the additive (the domain diameter formed from the olefin polymer, etc.) on the surface of the test piece obtained in the example was measured. Figure 1(a) is a view from the top, and Figure 1(b) is a view from the thickness direction. The arrow indicates the direction of resin flow during injection molding. The domain diameter of the additive was confirmed using a scanning electron microscope (SEM) at observation area 2 in the thickness direction in Figure 1(b). The domain diameter was calculated by observing five randomly selected samples and excluding the bottom two, and the average value of the remaining three samples was used. The unit is μm. Here, the major axis of the domain diameter is the length of the longest part in one domain, and the minor axis is the diameter in the direction perpendicular to the major axis, and is the length of the shortest part. Figure 2 shows the results of a scanning electron microscope (SEM) of the surface of the injection-molded product in Example 1. Figure 3 is the same photograph as Figure 2, with lines of the major and minor axes drawn in. In addition, the aspect ratio (major axis / minor axis) of the domain diameter of the additive was calculated. The scanning electron microscope used was a Hitachi High-Technologies SU3800 scanning electron microscope.

[0082] [Table 2]

[0083] [Table 3]

[0084] In Tables 2 and 3 above, MFR A / MFR B is the MFR of (B) the olefin polymer B (A) MFR of polyacetal resin A The ratio of In Tables 2 and 3 above, the unit of the limit PV value is MPa·cm / s. In Tables 2 and 3 above, the creep rupture time is shown in hours. In Tables 2 and 3 above, the domain diameters are shown in μm.

[0085] As is clear from the above results, the molded articles formed from the resin compositions of the present embodiment were excellent in both sliding properties and creep resistance (Examples 1 to 7). In contrast, when the content of (B) olefin polymer was low (Comparative Example 2), the sliding properties were poor, whereas when the content of (B) olefin polymer was high (Comparative Example 3), the creep resistance was poor. Also, MFR A / MFR B When was outside the range of the present invention (Comparative Examples 1 and 4), the creep resistance was poor. (A) When the MFR of the polyacetal resin was outside the range of the present invention (Comparative Examples 4, 5, and 6), the creep resistance was poor. In particular, since the diameter of the domains formed by the olefin polymer (B) was within the desired range, molded articles having a good balance between sliding properties and creep resistance were obtained.

[0086] Although the present invention has been described in detail with reference to specific embodiments, it will be apparent to those skilled in the art that various modifications can be made without departing from the spirit and scope of the invention. [Explanation of symbols]

[0087] 1. Injection molded product (creep test piece) 2 Observation areas for creep rupture tests

Claims

1. (A) Melt mass flow rate (MFR) measured under the conditions of a temperature of 190°C and a load of 2.16 kg Ａ ) is 0.5 to 5 g / 10 min, relative to 100 parts by mass of the polyacetal resin (A), (B) Melt mass flow rate (MFR) measured under the conditions of a temperature of 190°C and a load of 2.16 kg Ｂ 0.5 to 8 parts by mass of an olefin polymer having a viscosity of 0.5 to 50.0 g / 10 min, MFR of (B) Ｂ The MFR of (A) Ａ The ratio (MFR Ａ / MFR Ｂ ) is 0.05 to 5.

2. (A) Melt mass flow rate (MFR) measured under the conditions of a temperature of 190°C and a load of 2.16 kg Ａ ) is 0.5 to 5 g / 10 min, relative to 100 parts by mass of the polyacetal resin (A), (B) Melt mass flow rate (MFR) measured under the conditions of a temperature of 190°C and a load of 2.16 kg Ｂ 0.5 to 8 parts by mass of an olefin polymer having a viscosity of 0.5 to 50.0 g / 10 min, A resin composition, wherein in an injection-molded article formed from the resin composition, the domains derived from the olefin polymer (B) have an aspect ratio of 1 to 10 and a longest diameter of 1 to 30 μm.

3. MFR of (B) Ｂ The MFR of (A) Ａ The ratio (MFR Ａ / MFR Ｂ 3. The resin composition according to claim 1, wherein the ρ is 0.8 to 2.

0.

4. MFR of (B) Ｂ The resin composition according to claim 1 or 2, wherein the viscosity is 0.65 to 12.0 g / 10 min.

5. The resin composition according to claim 1 or 2, further comprising (C) a nitrogen-containing compound.

6. an aspect ratio of a domain derived from the olefin polymer (B) in an injection-molded article formed from the resin composition is 1 to 10, and a longest diameter of the domain is 1 to 30 μm; MFR of (B) Ｂ The MFR of (A) Ａ The ratio (MFR Ａ / MFR Ｂ ) is 0.8 to 2.0, MFR of (B) Ｂ is 0.65 to 12.0 g / 10 min, The resin composition according to claim 1 , further comprising (C) a nitrogen-containing compound.

7. Pellets of the resin composition according to any one of claims 1, 2 and 6.

8. A molded article formed from the resin composition according to any one of claims 1, 2 and 6.

9. A molded article formed from the pellets of claim 7.

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