JP2012184280A - Polyamide resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyamide resin composition improving the barrier property of the corresponding polyamide resin of high flexibility, having excellent impact resistance, chemical resistance and barrier properties, and excellent as a material especially for containers for organic fuel, tubes and parts.SOLUTION: The polyamide resin composition includes: 100 pts.mass of a copolyamide resin (A), 10-250 pts.mass of a m-xylylene group-containing polyamide resin (B); and 0-100 pts.mass of a modified polyolefin and/or styrenic copolymer (C). This composition is characterized in that: the copolyamide resin (A) includes: decaneterephthalamide units (a); and undecanamide units and/or dodecanamide units (b), wherein the content of the decaneterephthalamide units (a) is 50-98 mol% based on a total of 100 mol% of the units (a) and the units (b), and the content of the undecanamide units and/or dodecanamide units (b) is 2-50 mol%, based on 100 mol% of the total of the units (a) and the units (b).

Description

  The present invention relates to a polyamide resin composition having excellent barrier properties. More specifically, the present invention relates to a polyamide resin composition that improves the barrier property of a polyamide resin having excellent flexibility and has excellent impact resistance and chemical resistance, and particularly excellent as a container for organic fuel, a tube, and a component material. It is.

In recent years, plastic fuel containers such as blow molding have attracted attention as fuel storage containers in terms of weight reduction, elimination of rust prevention treatment, and improvement in the degree of freedom of shape, and replacement with metal fuel containers has progressed. Yes. However, the high-density polyethylene mainly used is excellent in mechanical properties and processing properties, but has a poor fuel barrier property, so that it can no longer comply with regulations on fuel permeation.
Therefore, attempts have been made to suppress the permeation of fuel by a method of fluorinating the inner surface of the container or a method of blending polyethylene and polyamide (see Patent Documents 1 to 3). Of these, the fluorine treatment is not efficient because the processing step is a separate step. Also, the blend of polyamide and polyethylene is insufficient as fuel permeability. In order to improve these attempts, in Patent Document 4, an attempt is made to disperse using a modified olefin in order to blend a metaxylylene group-containing polyamide into polyethylene. It is not possible to improve the sex sufficiently. In particular, for fuels in which alcohols are added to gasoline in order to reduce the use of fossil fuels, barrier resins such as polyamide 6, metaxylylene group-containing polyamides, and ethylene vinyl alcohol copolymers are inferior in alcohol barrier properties. Polyethylenes are superior to alcohol barriers, but have poor gasoline permeability. For alcohol barriers and gasoline barriers, there is a need for barrier resins with higher barrier properties.

JP 55-121017 A Japanese Patent Laid-Open No. 5-156036 JP-A-10-279552 JP 2007-217509 A

  The present invention is intended to solve the above-described problems in fuel containers and to provide a polyamide resin composition having excellent barrier properties and flexibility.

  In order to solve the above-mentioned object, the present inventor, as a polyamide resin, a polyamide resin obtained by copolymerizing 11 nylon and / or 12 nylon at a specific ratio with respect to 10T nylon (hereinafter, for example, 10T nylon and 11 nylon A copolymer is abbreviated as “10T11” and a copolymer of 10T nylon and 12 nylon may be abbreviated as “10T12”) and a metaxylylene group-containing polyamide to obtain a specific dispersion structure design, The inventors have found that a polyamide molded article having excellent barrier properties can be obtained, and have completed the present invention.

That is, the present invention has the following constitution (1) 100 parts by mass of copolymerized polyamide resin (A), 10 to 250 parts by mass of metaxylylene group-containing polyamide resin (B), modified polyolefin and / or styrene copolymer. Compound (C) A polyamide resin composition containing 0 to 100 parts by mass, wherein the copolymerized polyamide resin (A) comprises a decanterephthalamide unit (a), an undecanamide unit and / or a dodecanamide unit (b) And the content of the decanterephthalamide unit (a) is 50 to 98 mol% with respect to a total of 100 mol% of the unit (a) and the unit (b), and the undecanamide unit and / or Alternatively, the content of the dodecanamide unit (b) is 2 with respect to 100 mol% in total of the unit (a) and the unit (b). Polyamide resin composition, which is a 50 mol%.
(2) The content of the decanterephthalamide unit (a) is 75 to 98 mol% with respect to 100 mol% in total of the unit (a) and the unit (b), and the undecanamide unit and / or The polyamide resin composition according to (1), wherein the content of the dodecanamide unit (b) is 2 to 25 mol% with respect to 100 mol% in total of the unit (a) and the unit (b).
(3) The copolymerized polyamide resin (A) comprises a decanterephthalamide unit (a), an undecanamide unit and / or a dodecanamide unit (b), and other units (c) containing an amino group and a carboxyl group The content of the other unit (c) is 0 to 30 mol% with respect to 100 mol% in total of the unit (a), the unit (b) and the unit (c) (1 The polyamide resin composition according to any one of (2) to (2).
(4) The polyamide resin composition according to any one of (1) to (3), wherein the metaxylylene group-containing polyamide resin (B) has a structure in which it is dispersed independently in the copolymerized polyamide resin (A) matrix.

  The polyamide resin composition obtained by the present invention is excellent in barrier properties, fuel swellability, and chemical resistance, and can be used for various molded articles such as fuel containers, tubes, and fuel parts.

FIG. 1 is a photograph of a dispersion structure of a polyamide resin composition according to one embodiment (Example 4) of the present invention, where the black part is the component (A) and the white part is the component (B).

  The copolymerized polyamide resin (A) used in the present invention is a copolymer containing a decanterephthalamide unit (a) and an undecanamide unit and / or a dodecanamide unit (b).

  The decane terephthalamide unit (a) is a structural unit corresponding to 10T nylon obtained by polycondensation of 1,10-decanediamine (10) and terephthalic acid (T) in an equimolar amount. Is represented by the following formula (I).

  The decanterephthalamide unit (a) plays a role of imparting excellent heat resistance, low water absorption, chemical resistance, slidability and the like to the copolymerized polyamide resin (A). The content of the decanterephthalamide unit (a) in the copolymerized polyamide resin (A) is preferably 50 to 98 mol% with respect to 100 mol% in total of the unit (a) and the unit (b). Is 75 to 98 mol%. If the content of the unit (a) is less than the above range, the crystalline component 10T nylon is subject to crystal inhibition by the copolymer component, which may lead to a decrease in moldability and high temperature characteristics, while it is more than the above range. And the workability and impact resistance tend to be remarkably lowered, which is not preferable.

  The undecanamide unit and / or dodecanamide unit (b) is 11 nylon (undecanamide unit), 12 nylon obtained by polycondensation of 11-aminoundecanoic acid, 12-aminododecanoic acid, undecane lactam or lauryl lactam. It is a structural unit corresponding to (dodecanamide unit). Specifically, the undecanamide unit is represented by the following formula (II), and the dodecanamide unit is represented by the following formula (III). The unit (b) may be either an undecanamide unit or a dodecanamide unit, or both.

  The unit (b) is for improving the drawbacks of the unit (a) and plays a role in improving all of the impact resistance, workability and low water absorption of the copolymerized polyamide resin (A). The content of undecanamide units and / or dodecanamide units (b) in the copolymerized polyamide resin (A) (the sum of both when containing both undecanamide units and dodecanamide units) is the units (a) and It is 2-50 mol% with respect to a total of 100 mol% of the said unit (b), Preferably it is 2-25 mol%. When the content of the unit (b) is less than the above range, the impact resistance improvement effect of the copolymerized polyamide resin (A) tends to be thin, and the water absorption effect tends to be insufficient. If it exceeds the range, the crystallinity of the copolymerized polyamide resin (A) is significantly lowered and the crystallization speed is slowed down. As a result, the moldability may be impaired or the impact resistance may be lowered. Moreover, when the content rate of the unit (b) is more than the above range, the content rate of the unit (a) corresponding to 10T nylon relatively decreases, and heat resistance and slidability may be insufficient. Absent.

  The copolymerized polyamide resin (A) used in the present invention may contain other units (c) containing an amino group and a carboxyl group in addition to the units (a) and (b). Specific examples of the unit (c) include a structural unit obtained from an equimolar salt of an amine component and an acid component forming an amide, or a structural unit obtained from an aminocarboxylic acid or a lactam. This unit (c) gives the copolymer polyamide resin (A) other properties that cannot be obtained by 10T nylon, 11 nylon, and 12 nylon, and properties that can be obtained by 10T nylon, 11 nylon, and 12 nylon. It plays the role of further improvement. When the other unit (c) is contained, the content is 0 to 30 mol% with respect to a total of 100 mol% of the unit (a), the unit (b) and the unit (c). Is more preferable, more preferably 0 to 20 mol%, still more preferably 0 to 15 mol%. If the content of the unit (c) exceeds the above range, the content of the unit (a) and the unit (b), which are essential components, decreases, so that the copolymerized polyamide resin (A) is originally intended. The effect may not be sufficiently exhibited, which is not preferable.

  Examples of the amine component constituting the unit (c) include 1,2-ethylenediamine, 1,3-trimethylenediamine, 1,4-tetramethylenediamine, 1,5-pentamethylenediamine, and 2-methyl-1,5. -Pentamethylenediamine, 1,6-hexamethylenediamine, 1,7-heptamethylenediamine, 1,8-octamethylenediamine, 1,9-nonamethylenediamine, 2-methyl-1,8-octamethylenediamine, 1 , 10-decamethylenediamine, 1,11-undecamethylenediamine, 1,12-dodecamethylenediamine, 1,13-tridecamethylenediamine, 1,16-hexadecamethylenediamine, 1,18-octadecamethylenediamine , 2,2,4 (or 2,4,4) -trimethylhexamethylenediamine Aliphatic diamines; Piperazine, cyclohexanediamine, bis (3-methyl-4-aminohexyl) methane, alicyclic diamines such as bis- (4,4′-aminocyclohexyl) methane, isophoronediamine; metaxylylenediamine, para And aromatic diamines such as xylylenediamine, paraphenylenediamine, and metaphenylenediamine; and hydrogenated products thereof.

  As the acid component constituting the unit (c), polyvalent carboxylic acid or acid anhydride can be used. As polyvalent carboxylic acids, terephthalic acid, isophthalic acid, orthophthalic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 4,4'-diphenyldicarboxylic acid, 2,2'-diphenyldicarboxylic acid , 4,4′-diphenyl ether dicarboxylic acid, 5-sulfonic acid sodium isophthalic acid, 5-hydroxyisophthalic acid and other aromatic dicarboxylic acids; fumaric acid, maleic acid, succinic acid, itaconic acid, adipic acid, azelaic acid, sebacic acid 1,11-undecanedioic acid, 1,12-dodecanedioic acid, 1,14-tetradecanedioic acid, 1,18-octadecanedioic acid, 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1 , 2-Cyclohexanedicarboxylic acid, 4-methyl-1,2-cyclohexanedica Bon acid, aliphatic and alicyclic dicarboxylic acids such as dimer acid; and the like. In addition, lactams such as ε-caprolactam and aminocarboxylic acids having a structure in which they are ring-opened can also be used.

  Specific examples of the unit (c) include structural units corresponding to the following polyamides. That is, polycaproamide (nylon 6), polytetramethylene adipamide (nylon 46), polyhexamethylene adipamide (nylon 66), polyundecamethylene adipamide (nylon 116), polymetaxylylene adipamide (Nylon MXD6), polyparaxylylene adipamide (nylon PXD6), polytetramethylene sebacamide (nylon 410), polyhexamethylene sebacamide (nylon 610), polydecamethylene adipamide (nylon 106), Polydecamethylene sebamide (nylon 1010), polyhexamethylene dodecamide (nylon 612), polydecamethylene dodecamide (nylon 1012), polyhexamethylene isophthalamide (nylon 6I), polytetramethylene terephthalamide (nylon) T), polypentamethylene terephthalamide (nylon 5T), poly-2-methylpentamethylene terephthalamide (nylon M-5T), polyhexamethylene terephthalamide (nylon 6T), polyhexamethylene hexahydroterephthalamide (nylon 6T ( H)) Polynonamethylene terephthalamide (nylon 9T), Polyundecamethylene terephthalamide (nylon 11T), Polydodecamethylene terephthalamide (nylon 12T), Polybis (3-methyl-4-aminohexyl) methane terephthalamide (nylon) PACMT), polybis (3-methyl-4-aminohexyl) methane isophthalamide (nylon PACMI), polybis (3-methyl-4-aminohexyl) methane dodecamide (nylon PACM12) Polybis (3-methyl-4-amino-hexyl) methane tetra deca (nylon PACM14) is a polyamide such as. Among these, polydodecamethylene terephthalamide (nylon 12T), polydecamethylene sebacamide (nylon 1010), polydecamethylene dodecamide (nylon 1012), etc. have improved processability, low water absorption and impact resistance. It is preferable in that the effect is high.

  The copolymerized polyamide resin (A) used in the present invention is not greatly different in terms of properties as a polyamide molded body, but from the viewpoint of aiming for a low-carbon society and environmental harmony, plant-derived raw materials may be used. preferable. Specifically, it is preferable to use a castor oil-derived raw material that does not compete with edible. For example, when the unit (a) includes a structural unit corresponding to decanediamine, it corresponds to aminoundecanoic acid as the unit (b). When a structural unit is included, a plant-derived raw material can be used when the unit (c) includes a structural unit corresponding to sebacic acid. Examples of the composition of the copolymerized polyamide resin (A) recommended in the present invention include nylon 10T / 11 and nylon PA10T / 1010/11 containing these plant raw materials in a very high ratio.

  The melting point (Tm) of the copolymerized polyamide resin (A) is preferably 220 to 315 ° C, more preferably 240 to 300 ° C. When the melting point (Tm) exceeds the above range, the required processing temperature when molding the polyamide resin composition by various molding methods becomes extremely high, so that the resin etc. is decomposed during processing, resulting in a decrease in molecular weight due to deterioration. As a result, the desired physical properties may not be obtained, or the moldability may decrease. On the other hand, if the melting point (Tm) is lower than the above range, the crystallization rate may be slow and molding may be difficult.

  The glass transition temperature (Tg) of the copolymerized polyamide resin (A) is preferably 50 to 120 ° C, more preferably 60 to 100 ° C. When the glass transition temperature (Tg) exceeds the above range, not only the mold temperature required for molding the polyamide resin composition by the blow molding method becomes too high, but molding becomes difficult. In some cycles, crystallization may not proceed sufficiently, and the heat distortion temperature may decrease, or in later use, crystallization will progress at high temperatures and deformation due to secondary shrinkage may occur. There is. On the other hand, when the glass transition temperature (Tg) is lower than the above range, the physical properties are likely to be greatly reduced.

  The relative viscosity (RV) measured at 20 ° C. in 96% concentrated sulfuric acid of the copolymerized polyamide resin (A) is preferably 0.4 to 4.0, more preferably 1.0 to 3.5, still more preferably 1. .5 to 3.0. Examples of a method for setting the relative viscosity of the polyamide within a certain range include a means for adjusting the molecular weight. In addition, all the relative viscosities (RV) described in the present specification are measured at 96C in 96% concentrated sulfuric acid.

The acid value and amine value of the copolymerized polyamide resin (A) are preferably 0 to 200 equivalents / 1 × 10 ⁶ g, more preferably 0 to 100 equivalents / 1 × 10 ⁶ g. When the terminal functional group exceeds 200 equivalents / 1 × 10 ⁶ g, not only gelation or deterioration is likely to occur during the melt residence, but also there is a possibility of causing problems such as coloring and hydrolysis in the use environment. In particular, when a reactive compound such as glass fiber or maleic acid-modified polyolefin is compounded, the acid value and / or amine value may be adjusted to 5 to 100 equivalents / 1 × 10 ⁶ g in accordance with the reactivity and the reactive group. preferable.

  The copolymerized polyamide resin (A) adjusts the amount of end groups and the molecular weight of the polyamide by adjusting the molar ratio between the amount of amino groups and the amount of carboxyl groups and by polycondensation or by adding a terminal blocking agent. Can do. When polycondensation is performed at a fixed ratio of the amino group and carboxyl group, the molar ratio of all diamines and all dicarboxylic acids used is diamine / dicarboxylic acid = 1.00 / 1.05 to 1.10. It is preferable to adjust to the range of /1.00.

  When the end of the copolymerized polyamide resin (A) is blocked, the timing for adding the end-capping agent may be at the time of raw material charging, at the start of polymerization, at the end of polymerization, or at the end of polymerization. The end capping agent is not particularly limited as long as it is a monofunctional compound having reactivity with the amino group or carboxyl group at the end of the polyamide, but monocarboxylic acid, monoamine, acid anhydride (phthalic anhydride, etc.) , Monoisocyanates, monoacid halides, monoesters, monoalcohols, and the like can be used. Specifically, as the end-capping agent, for example, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, caprylic acid, lauric acid, tridecanoic acid, myristic acid, palmitic acid, stearic acid, pivalic acid, isobutyric acid Aliphatic monocarboxylic acids such as cycloaliphatic carboxylic acids; aromatic monocarboxylic acids such as benzoic acid, toluic acid, α-naphthalenecarboxylic acid, β-naphthalenecarboxylic acid, methylnaphthalenecarboxylic acid, and phenylacetic acid Carboxylic acid; acid anhydrides such as maleic anhydride, phthalic anhydride, hexahydrophthalic anhydride; methylamine, ethylamine, propylamine, butylamine, hexylamine, octylamine, decylamine, stearylamine, dimethylamine, diethylamine, dipropylamine , Aliphatic compounds such as dibutylamine And alicyclic monoamines such as cyclohexylamine and dicyclohexylamine; aromatic monoamines such as aniline, toluidine, diphenylamine and naphthylamine;

  The copolymerized polyamide resin (A) can be produced by a conventionally known method. For example, the raw material monomers (decanediamine and terephthalic acid) for introducing the unit (a) and the unit (b) are combined. Raw material monomers for introduction (11-aminoundecanoic acid, 12-aminododecanoic acid, undecane lactam, lauryl lactam and raw material monomers selected from the group consisting of these), and, if necessary, the unit (c) It can be easily synthesized by co-condensation reaction with a raw material monomer to be introduced (a raw material monomer obtained from an equimolar molar salt of an amine component and an acid component, an aminocarboxylic acid or a lactam). The order of the copolycondensation reaction is not particularly limited, and all the raw material monomers may be reacted at once, or a part of the raw material monomers may be reacted first, followed by the remaining raw material monomers. In addition, the polymerization method is not particularly limited, but it may proceed from raw material preparation to polymer production in a continuous process, or after preparing an oligomer once, the polymerization is advanced by an extruder or the like in another process, or the oligomer is A method of increasing the molecular weight by solid phase polymerization may be used. By adjusting the charging ratio of the raw material monomer, the ratio of each structural unit in the copolymerized polyamide resin to be synthesized can be controlled.

  Examples of the catalyst used for producing the copolymerized polyamide resin (A) include phosphoric acid, phosphorous acid, hypophosphorous acid or a metal salt, ammonium salt and ester thereof. Specific examples of the metal species of the metal salt include potassium, sodium, magnesium, vanadium, calcium, zinc, cobalt, manganese, tin, tungsten, germanium, titanium, and antimony. As the ester, ethyl ester, isopropyl ester, butyl ester, hexyl ester, isodecyl ester, octadecyl ester, decyl ester, stearyl ester, phenyl ester and the like can be added. Moreover, it is preferable to add sodium hydroxide from the viewpoint of improving the melt residence stability.

  Examples of the metaxylylene group-containing polyamide resin (B) used in the present invention include polyamides composed of metaxylylenediamine and dicarboxylic acid. As a polyamide composed of metaxylylenediamine and dicarboxylic acid, 70 mol% or more of the structural unit derived from diamine is derived from metaxylylenediamine, and 70 mol% or more of the structural unit derived from dicarboxylic acid is carbon. It is preferably derived from a dicarboxylic acid which is an α, ω-linear aliphatic carboxylic acid of formula 4-20. Particularly preferred is a polyamide containing a diamine component composed of metaxylylenediamine and metaxylylene adipamide composed of adipic acid as main structural units.

  Examples of amine components other than metaxylylenediamine constituting the metaxylylene group-containing polyamide resin (B) include 1,2-ethylenediamine, 1,3-trimethylenediamine, 1,4-tetramethylenediamine, and 1,5-pentamethylene. Diamine, 2-methyl-1,5-pentamethylenediamine, 1,6-hexamethylenediamine, 1,7-heptamethylenediamine, 1,8-octamethylenediamine, 1,9-nonamethylenediamine, 2-methyl- 1,8-octamethylenediamine, 1,10-decamethylenediamine, 1,11-undecamethylenediamine, 1,12-dodecamethylenediamine, 1,13-tridecamethylenediamine, 1,16-hexadecamethylenediamine 1,18-octadecamethylenediamine, 2,2,4 (or 2 4,4) -aliphatic diamines such as trimethylhexamethylenediamine; piperazine, cyclohexanediamine, bis (3-methyl-4-aminohexyl) methane, bis- (4,4'-aminocyclohexyl) methane, isophoronediamine Such alicyclic diamines; aromatic diamines such as paraxylylenediamine, paraphenylenediamine, and metaphenylenediamine; and hydrogenated products thereof.

  As the acid component other than adipic acid constituting the metaxylylene group-containing polyamide resin (B), polyvalent carboxylic acid or acid anhydride can be used. As polyvalent carboxylic acids, terephthalic acid, isophthalic acid, orthophthalic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 4,4'-diphenyldicarboxylic acid, 2,2'-diphenyldicarboxylic acid 4,4'-diphenyl ether dicarboxylic acid, 5-sulfonic acid sodium isophthalic acid, 5-hydroxyisophthalic acid and other aromatic dicarboxylic acids; fumaric acid, maleic acid, succinic acid, itaconic acid, azelaic acid, sebacic acid, 1, 11-undecanedioic acid, 1,12-dodecanedioic acid, 1,14-tetradecanedioic acid, 1,18-octadecanedioic acid, 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,2- Cyclohexanedicarboxylic acid, 4-methyl-1,2-cyclohexanedicarboxylic acid, da Aliphatic and alicyclic dicarboxylic acids such as mer acid; and the like. In addition, lactams such as ε-caprolactam and aminocarboxylic acids having a structure in which they are ring-opened can also be used.

  The metaxylylene group-containing polyamide resin (B) is produced by melt polymerization of the aforementioned diamine component and dicarboxylic acid component, and the production method is not particularly limited. It is produced by a conventionally known method such as a melt polymerization method and polymerization conditions. For example, it is produced by a method in which a salt composed of metaxylylenediamine and adipic acid is heated in the presence of water under pressure and polymerized in a molten state while removing added water and condensed water. The viscosity of the metaxylylene group-containing polyamide resin obtained by melt polycondensation is a relative viscosity measured with a 96% sulfuric acid solution and is preferably in the range of 1.4 to 2.4. When the relative viscosity is less than 1.4, the mechanical properties are extremely poor, and when it exceeds 2.4, the gelation tendency increases and the color tone is not good. In the molding of films and bottles, when a higher viscosity metaxylylene group-containing polyamide is required, it is preferable to increase the melt viscosity to the required viscosity by solid phase polymerization.

  The melting point of the metaxylylene group-containing polyamide resin is preferably controlled in the range of 160 ° C to 280 ° C, more preferably 170 to 260 ° C, and still more preferably 180 to 250 ° C. By bringing the melting point of the polyamide resin close to that of the copolymerized polyamide resin (A), the dispersibility and the dispersion structure during melt kneading can be stabilized. Moreover, it is preferable that the glass transition point of this polyamide resin is the range of 80-130 degreeC. If the glass transition point is less than 80 ° C., the barrier property is not sufficient, and if it exceeds 130 ° C., there is a problem in moldability.

  As addition amount of the metaxylylene group containing polyamide resin (B) used by this invention, 10-250 mass parts can be added with respect to 100 mass parts of copolymerization polyamide resin (A). For the purpose of obtaining a fuel-resistant material that improves chemical resistance and suppresses water absorption, the addition amount of the metaxylylene group-containing polyamide resin (B) is preferably 10 to 200 parts by mass, more preferably 20 to 100 parts. Part by mass.

  The modified polyolefin and styrene copolymer used in the present invention include a monomer having a carboxylic acid group or / and a carboxylic anhydride group in an unmodified polymer molecular chain by copolymerization or graft polymerization. Α-olefin-based and styrene-based (co) polymers.

  Examples of unmodified polymers that can be used in obtaining the above-described modified polyolefin and styrene-based polymer include, for example, homopolymers such as polyethylene, polypropylene, polybutene-1, polypentene-1, polymethylpentene, ethylene, Α-olefins such as propylene, butene-1, pentene-1, 4-methylpentene-1, hexene-1, octene-1, isobutylene, 1,4-hexadiene dicyclopentadiene, 2,5-norbornadiene, 5-ethylidene Radical polymerization of at least one non-conjugated diene such as norbornene, 5-ethyl-2,5-norbornadiene, 5- (1'-probenyl) -2-norbornene using a normal metal catalyst or a metallocene high performance catalyst The polyolefin obtained by . Specific examples include ethylene / propylene copolymer, ethylene / butene-1 copolymer, ethylene / hexene-1 copolymer, ethylene / propylene / dicyclopentadiene copolymer, ethylene / propylene / 5-ethylidene-2. -Norbornene copolymer, unhydrogenated or hydrogenated polybutadiene, unhydrogenated or hydrogenated styrene / isoprene / styrene triblock copolymer, unhydrogenated or hydrogenated styrene / butadiene / styrene triblock copolymer, etc. It is done. Among these, the diene elastomer is an AB or ABA ′ type block copolymer elastic body composed of a vinyl aromatic hydrocarbon and a conjugated diene, and the end blocks A and A ′ are the same. Or thermoplastic homopolymers or copolymers derived from vinyl aromatic hydrocarbons, which may be different and the aromatic moiety may be monocyclic or polycyclic, examples of such vinyl aromatic hydrocarbons. Examples thereof include styrene, α-methylstyrene, vinyl toluene, vinyl xylene, ethyl vinyl xylene, vinyl naphthalene, and mixtures thereof. The intermediate polymer block B is composed of a conjugated diene hydrocarbon, and examples thereof include polymers derived from 1,3-butadiene, 2,3-dimethylbutadiene, isoprene, 1,3-pentadiene, and mixtures thereof. In addition, it is also possible to use a block copolymer obtained by subjecting the intermediate polymer block B to a hydrogenation treatment.

  The method for introducing a carboxylic acid group or / and a carboxylic acid anhydride group into an unmodified polymer is not particularly limited, and it is possible to use a method such as copolymerization or graft introduction using a radical initiator to an unmodified polyolefin. it can. In the case of copolymerization, the introduction amount of these functional group-containing components is in the range of 0.1 to 20 mol%, preferably 0.5 to 12 mol%, based on the entire olefin monomer in the modified polyolefin, In the case of grafting, the content is in the range of 0.1 to 10% by mass, preferably 0.5 to 6% by mass, based on the mass of the modified polyolefin. If the introduction amount of the functional group-containing component is too small, the impact resistance may not be sufficiently imparted, and conversely if too large, the stability of the melt viscosity may be impaired. The introduction amount of the functional group-containing component is the same for the styrene copolymer.

  Specific examples of the modified polyolefin and / or styrenic polymer having a carboxylic acid group or / and a carboxylic anhydride group include maleic anhydride-modified polyethylene, maleic anhydride-modified polypropylene, ethylene / acrylic acid copolymer, ethylene / Methacrylic acid copolymers, and some or all of the carboxylic acid moieties in these copolymers as salts with sodium, lithium, potassium, zinc, calcium, ethylene / methyl acrylate copolymers, ethylene / acrylic Ethyl acid copolymer, ethylene / methyl methacrylate copolymer, ethylene / ethyl methacrylate copolymer, ethylene / ethyl acrylate-g-maleic anhydride copolymer (where "-g-" represents graft) (Hereinafter the same)), ethylene / methyl methacrylate-g-maleic anhydride Polymer, ethylene / propylene-g-maleic anhydride copolymer, ethylene / butene-1-g-maleic anhydride copolymer, ethylene / propylene / 1,4-hexadiene-g-maleic anhydride copolymer, Ethylene / propylene / dicyclopentadiene-g-maleic anhydride copolymer, ethylene / propylene / 2,5-norbornadiene-g-maleic anhydride copolymer, hydrogenated styrene / butadiene / styrene-g-maleic anhydride copolymer Examples thereof include a polymer and a hydrogenated styrene / isoprene / styrene-g-maleic anhydride copolymer. Among these, a (co) polymer having a carboxylic acid anhydride group having high reactivity with an amine is preferable.

  As addition amount of the modified polyolefin and / or styrene copolymer (C) used in the present invention, 0 to 100 parts by mass can be added to 100 parts by mass of the copolymerized polyamide resin (A). When added for the purpose of improving impact resistance and flexibility, the amount is preferably 10 to 80 parts by mass, and more preferably 10 to 60 parts by mass. Addition in excess of 100 parts by mass is not preferable because the barrier properties are significantly reduced.

  The polyamide resin composition of the present invention may contain a thermoplastic resin other than the copolymerized polyamide resin (A) as long as the effects of the present invention are not impaired. Examples of the thermoplastic resin other than the copolymerized polyamide resin (A) include, for example, polyphenylene sulfide (PPS), liquid crystal polymer (LCP), aramid resin, polyether ether ketone (PEEK), polyether ketone (PEK), poly Etherimide (PEI), Thermoplastic polyimide, Polyamideimide (PAI), Polyetherketoneketone (PEKK), Polyphenylene ether (PPE), Polyethersulfone (PES), Polysulfone (PSU), Polyarylate (PAR), Polyethylene terephthalate , Polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polycarbonate (PC), polyoxymethylene (POM), polypropylene (PP), polyethylene (PE), polymethylpe Ten (TPX), polystyrene (PS), polymethyl methacrylate, acrylonitrile - styrene copolymer (AS), acrylonitrile - butadiene - styrene copolymer (ABS) and the like. When the compatibility between these other thermoplastic resins and the copolymerized polyamide resin (A) is low, a compatibilizing agent such as a reactive compound or a block polymer may be added as necessary, or other thermoplastic resins may be added. May be modified (particularly acid modification is preferred). The other thermoplastic resin may be blended in a melted state by melt kneading with the copolymerized polyamide resin (A), or the other thermoplastic resin is formed into a fibrous or particulate form, and the copolymerized polyamide resin ( It may be dispersed in A). When other thermoplastic resins are contained, the content is preferably 0 to 50 parts by mass, more preferably 0 to 35 parts by mass, and still more preferably 100 parts by mass of the copolymerized polyamide resin (A). Is 0 to 20 parts by mass.

  In the polyamide resin composition of the present invention, a compound or a polymer having a substituent that reacts with the amino group or carboxyl group of the copolymerized polyamide resin (A) is used as any of the optional components described above. Thus, such a reactive substituent may be introduced to increase the degree of crosslinking. Examples of the reactive substituent include functional groups such as a glycidyl group, a carboxyl group, a carboxylic acid metal salt, an ester group, a hydroxyl group, an amino group, and a carbodiimide group, and a polyester terminal such as a lactone, lactide, and lactam, and a ring opening. Examples thereof include functional groups that can be added, and among these, a glycidyl group or a carbodiimide group is preferred from the viewpoint of the speed of the reaction. There may be only one kind of such a substituent, or two or more kinds, and it may have different kinds of functional groups in one molecule. In addition, when a reactive substituent is introduced, the amount of introduction should be in a range in which gel or the like is not generated by advanced crosslinking.

  In preparing the polyamide resin composition of the present invention, 10 to 250 parts by mass of the copolymerized polyamide resin (A) and the metaxylylene group-containing polyamide resin (B), the modified polyolefin and / or the styrene copolymer (C) and other The method for mixing the optional components is not particularly limited. For example, a metaxylylene group-containing polyamide resin (B), a modified polyolefin and / or a styrene copolymer (C) and other optional components (such as inorganic reinforcing materials and additives) may be used as a copolymerized polyamide resin (A ). Specifically, 1) it is added into the polymerization machine after completion of the polymerization, 2) it is directly added to the molten copolyamide resin immediately after leaving the polymerization machine and kneaded, or 3) it is solidified (for example, A method of melt kneading after adding to the copolymerized polyamide resin (A) in the form of powder or pellets can be applied. In the above method 1) or 2), since the copolymerized polyamide resin is in a molten state, the addition of the metaxylylene group-containing polyamide resin (B), the modified polyolefin and / or the styrene copolymer (C) can be directly increased. In the above method 3), the melt-viscosity is heated and re-melted to uniformly disperse and mix the metaxylylene group-containing polyamide resin (B), the modified polyolefin and / or the styrene copolymer (C). It is desirable.

  There is no restriction | limiting in particular in the heating remelting method, What is necessary is just to employ | adopt any method well-known to those skilled in the art, For example, a single screw extruder, a twin screw extruder, a pressure kneader, a Banbury mixer etc. can be used. Among these, a twin screw extruder is particularly preferably used. The operating conditions and the like of the twin screw extruder vary depending on various factors such as the type of polyamide resin (A) and the type and amount of each component, and are not uniquely determined. The melting point (generally about 170 to 320 ° C.) + 25 ° C. may be set. It may be considered that the operation time is within 10 minutes, for example, 1 to several minutes, and the target melt viscosity is sufficiently reached. As for the screw configuration of the extruder, it is preferable that several kneading disks with excellent kneading are incorporated.

In the case where the present invention is a reinforced polyamide resin composition containing an inorganic reinforcing material or the like, a heat-resistant agent is added for the heat stability of the polyamide resin composition when it is retained for a long time in a molten state at a high temperature during molding. It is useful. In addition, copper compounds such as copper halides such as copper acetate, copper iodide, copper chloride, and copper bromide should be used as long-term heat aging inhibitors effective in a high temperature environment of 120 ° C or higher. Is preferred. The addition amount of the copper compound is preferably 0.005 to 0.5 parts by mass, more preferably 0.01 to 0.5 parts by mass with respect to 100 parts by mass of the reinforced polyamide resin composition.
The copper compound is also effective in combination with an alkali halide such as potassium iodide, potassium chloride or sodium iodide. As other heat-resistant agents, it is preferable to use phosphorus antioxidants, hindered phenol compounds, phosphite compounds, thioether compounds, and the like as antioxidants and antioxidants within a known range.

  The polyamide resin composition of the present invention is prepared by mixing the copolymerized polyamide resin (A), the metaxylylene group-containing polyamide resin (B), the modified polyolefin and / or the styrene copolymer (C), and processing the mixture by the method described above. You can do that. The ratio of the copolymerized polyamide resin (A), the metaxylylene group-containing polyamide resin (B), and the modified polyolefin and / or styrene copolymer (C) in the mixing ratio is (A) 10 parts by mass with respect to 100 parts by mass. 250 parts by mass, (C) 0 to 100 parts by mass, preferably (A) 100 parts by mass, (B) 10 to 200 parts by mass, (C) 10 to 80 parts by mass, more preferably (A) It is 20-100 mass parts and (C) 10-60 mass parts with respect to 100 mass parts. When (B) is less than 10 parts by mass, there is no effect of improving the barrier property, and when it exceeds 250 parts by mass, water absorption and chemical resistance are deteriorated. If (C) exceeds 100 parts by mass, the viscosity is excessively increased, the moldability is deteriorated, and the barrier property is further lowered.

  The relative viscosities of the copolymerized polyamide resin (A) and the metaxylylene group-containing polyamide resin (B) in the present invention are preferably 1.7 to 4.0, and more preferably 1.9 to 3.8. More preferred. The relative viscosity is measured by the method described later.

Regarding the dispersion structure of the copolymerized polyamide resin (A) and the metaxylylene group-containing polyamide resin (B) in the present invention, it is preferable that (A) and (B) form a phase separation interface and have an independent dispersion structure. . In particular, from the viewpoint of water absorption, chemical resistance, toughness, and slidability, the metaxylylene group-containing polyamide resin (B), which tends to be brittle as mechanical properties, is dispersed independently in the matrix of the copolymerized polyamide resin (A). Is preferred. When (B) forms a continuous phase, it becomes brittle as a mechanical property, including when it has a co-continuous structure with (A), or when (B) is in a matrix, and has chemical resistance. (For example, calcium chloride solution resistance characteristics) deteriorate. However, when a multilayer molded body is prepared using the polyamide resin composition of the present invention as a barrier layer, the dispersion structure of (A) and (B) may be a co-continuous structure of (B) and (A) or ( It can also be used when B) is a matrix and (A) is independently dispersed.
In order to obtain a structure in which (B) is independently dispersed in the matrix of (A), it is obtained by producing a polyamide resin composition under the above-described conditions.

  The polyamide fat composition in the present invention is a polyamide containing an aromatic component in both of the copolymerized polyamide resin (A) and the metaxylylene group-containing polyamide resin (B), and therefore, a method for compatibilization is particularly included. And a uniform phase separation and dispersion structure can be obtained. When (B) becomes a dispersion layer and a phase separation and dispersion structure is formed in (A) which is a matrix component, the dispersed particle size is determined by the structure and viscosity of (A) and (B). It is not preferable that the system is homogenized. In order to obtain a clear phase separation and dispersion structure, it is preferable that the long chain aliphatic component is not included in the metaxylylene group-containing polyamide resin (B). When the meta-xylene group-containing polyamide resin (B) contains a long-chain aliphatic component, not only the barrier property of the component (B) is lowered, but also the structures of the component (A) and the component (B) are too close. This is not preferable because it does not tend to have a phase separation and dispersion structure.

  In the polyamide resin composition of the present invention, in the injection molded product, blow molded product, film, sheet, and stretched film, it is preferable from the viewpoint of barrier properties that (B) is surface-oriented. In order to control the plane orientation in stretching in the molten state or solid state, the molecular weight of the metaxylylene group-containing polyamide resin (B) is 20000 or more, and the molecular weight of the component (B) that is the dispersion layer at the time of stretching It is preferable from the viewpoint that the entanglement is large and cannot be broken during stretching.

  When the modified polyolefin and / or styrene copolymer (C) is added to the copolymerized polyamide resin (A) and the metaxylylene group-containing polyamide resin (B) in the present invention, (A), (B), (C) From the viewpoint of barrier properties and impact resistance, it is preferable that (B) and (C) are dispersed independently using (A) as a matrix.

  The molded product obtained from the polyamide resin composition of the present invention has the above-mentioned copolymerized polyamide resin (A) matrix having a metaxylylene group-containing polyamide resin (B), a modified polyolefin and / or a styrene copolymer (C). It is made of a polyamide resin composition with excellent fuel barrier properties by separating and dispersing structure, and has low water absorption, excellent chemical resistance, and excellent barrier properties. It is used as a barrier layer of a multilayer molded product to be formed and other fuel parts.

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.
In addition, the measured value described in the Example is measured by the following method.

<Melting point (Tm) and glass transition temperature (Tg)>
A sample (polyamide resin) that was dried under reduced pressure at 105 ° C. for 15 hours was weighed in an aluminum pan (“Product Number 900793.901” manufactured by TA Instruments), and was measured with an aluminum lid (“Product Number 900794.901” manufactured by TA Instruments). After sealing, using a differential scanning calorimeter (“DSCQ100” manufactured by TA Instruments), the temperature was raised from room temperature to 20 ° C./minute, held at 350 ° C. for 3 minutes, then the pan was taken out and immersed in liquid nitrogen. It was cooled rapidly. Thereafter, the pan was taken out from the liquid nitrogen and allowed to stand at room temperature for 30 minutes, and then the temperature was raised from room temperature to 350 ° C. at 20 ° C./min using the differential scanning calorimeter, and the endothermic peak temperature due to melting at that time Was the melting point (Tm). In addition, the temperature at the intersection of the base line extension below the glass transition point and the tangent line indicating the maximum slope from the peak rising portion to the peak apex in the second temperature increase process is expressed as the glass transition temperature ( Tg).

<Relative viscosity>
0.25 g of polyamide resin was dissolved in 25 mL of 96% sulfuric acid and measured at 20 ° C. using an Ostwald viscometer.

<Number average molecular weight>
2 mg of each sample was weighed, dissolved in 4 mL of hexafluoroisopropanol (HFIP) / sodium trifluoroacetate 10 mM solution, filtered through a 0.2 μm membrane filter, and the obtained sample solution was gel permeated under the following conditions. The number average molecular weight was calculated | required by performing the chromatography (GPC) analysis. The molecular weight was calculated in terms of standard polymethyl methacrylate, and those having a molecular weight of 1000 or less were excluded as oligomers.
Equipment: “HLC-8220GPC” manufactured by TOSOH
Column: “TSKgel SuperHM-H × 2”, “TSKgel SuperH2000” manufactured by TOSOH
Flow rate: 0.25 mL / min Concentration: 0.05% by mass
Temperature: 40 ° C
Detector: RI

<Bending elastic modulus>
It measured according to ISO-178.

<CE10 barrier property>
100 × 100 × 2mmt flat plate made by injection molding is press-molded, and the sheet molded product with a thickness of 0.15mm is cut into a size of 120mm × 150mm. A bag was made by heat sealing to 10 mm. The obtained bag was filled with 60 g of fuel of isooctane / toluene / ethanol = 45/45/10 vol%, and heat sealed so that the mouth part had a seal width of 10 mm. The fuel-filled bag was left in an explosion-proof high-temperature and high-humidity tank adjusted to 50 ° C. × 65% RH for 240 hours, and the fuel permeation amount was determined from the initial value and the change in weight after treatment.

<Calcium chloride resistance>
After the same samples as those used in the bending test (ISO-178) created by injection molding were subjected to the following treatments (i) to (iv), the occurrence of cracks was visually confirmed. Those with cracks were marked with ×, and those without cracks were marked with ○.
(I) 90 ° C. × 48 hr hot water immersion treatment (ii) Gauze soaked with 5% calcium chloride aqueous solution is treated on a test piece at 100 ° C. × 2 hr (iii) Gauze is removed and left at room temperature × 1 hr (iv) Repeat (iii) for 10 cycles

<Dispersed structure>
The structure observation was performed by observing a frozen section obtained by kneading a CrO microtome of a resin composition pellet obtained by kneading with RuO4 with a TEM (transmission electron microscope). A matrix resin in which the dispersed resin is uniformly dispersed is indicated as ◯. Those with non-uniform shapes and dispersion scales were marked with x. Here, the uniform dispersion means that the dispersion shape is the same and the dispersion scale does not include a periodic structure of 5 times or more. A non-uniform shape and a disperse scale refer to a disperse structure in which the shape is not a similar shape and the periodic structure includes a scale size of 5 times or more. In addition, it was judged that no clear phase separation structure could be taken because it was impossible to measure those that could not be dyed by dyeing. Until it was determined that measurement was not possible, in addition to TEM (transmission electron microscope), SEM (scanning electron microscope), SPM (scanning probe microscope (SPM), phase microscope, differential interference microscope) Carried out.

In the examples and comparative examples, the following raw materials were used.
<Copolymerized polyamide resin (A)>
(A1: Polyamide 10T11)
Decamethylenediamine 8.26 kg, terephthalic acid 7.97 kg, 11-aminoundecanoic acid 6.43 kg, sodium diphosphite 9 g, terminal adjuster 40 g acetic acid and 17.52 kg ion-exchanged water in a 50 liter autoclave First, the pressure was increased from normal pressure to 0.05 MPa with N 2, the pressure was released, and the pressure was returned to normal pressure. This operation was performed 3 times, N2 substitution was performed, and then the mixture was uniformly dissolved at 135 ° C. and 0.3 MPa with stirring. Thereafter, the solution was continuously supplied by a liquid feed pump, heated to 240 ° C. with a heating pipe, and heated for 1 hour. Thereafter, the heated solution was supplied to a pressure reaction can, and the temperature was raised to 290 ° C. to distill a part of water so as to maintain the can internal pressure at 3 MPa, thereby obtaining a low-order condensate. . Next, this low-order condensate is directly supplied to a twin-screw extruder (screw diameter 37 mm, L / D = 60) while maintaining the molten state, the resin temperature is set to 330 ° C., and water is removed from three vents. The polycondensation proceeded under melting to obtain a copolymerized polyamide resin (A1). The obtained copolymer polyamide resin (A1) has a composition of decanterephthalamide unit (10T) / undecanamide unit (11) = 60/40 (molar ratio), melting point 250 ° C., relative viscosity 2.6, glass transition The temperature was 75 ° C.

(A2: Polyamide 10T11)
In the method for producing the copolymerized polyamide resin (A1), the amount of decamethylenediamine was changed to 11.01 kg, the amount of terephthalic acid was changed to 10.62 kg, and the amount of 11-aminoundecanoic acid was 3.22 kg. A copolymerized polyamide resin (A2) was obtained in the same manner as in the above-described method for producing the copolymerized polyamide resin (A1) except that it was changed to. The obtained copolymerized polyamide resin (A2) has a composition of decanterephthalamide unit (10T) / undecanamide unit (11) = 80/20 (molar ratio), melting point 289 ° C., relative viscosity 2.6, glass transition The temperature was 93 ° C.

(A3: Polyamide 10T12)
In the production method of the above-described copolymerized polyamide resin (A2), except that 3.22 kg of 11-aminoundecanoic acid was changed to 2.93 kg of undecane lactam, the same method as that of the above-described copolymerized polyamide resin (A2) was used. Copolyamide resin (A3) was obtained. The obtained copolymer polyamide resin (A3) has a composition of decanterephthalamide unit (10T) / dodecanamide unit (12) = 80/20 (molar ratio), melting point 288 ° C., relative viscosity 2.4, glass transition The temperature was 92 ° C.

A4: Polyamide 6; “Nylon T-820” manufactured by Toyobo Co., Ltd., 6 nylon with relative viscosity RV = 3.1, number average molecular weight 25400, melting point 225 ° C.
A5: Polyamide 66; “Amilan (registered trademark) CM3001N” manufactured by Toray Industries, Inc. 66 nylon with relative viscosity RV = 2.8, number average molecular weight 17900, melting point 265 ° C.
A4 and A5 do not correspond to the component (A) in the present invention, but in the table below, they are described in the column of the component (A) for easy comparison.

B1: Polyamide MXD6 with relative viscosity of 2.6 (Mitsubishi Gas Chemical Co., Ltd. MX nylon S6007, polyamide resin composed of metaxylenediamine and adipic acid)
B2: Polyamide MXD6 with a relative viscosity of 2.1 (Mitsubishi Gas Chemical Co., Ltd. MX nylon S6001, a polyamide resin composed of metaxylenediamine and adipic acid)

Modified polyolefin polymer C1: Modic AP-P502 (manufactured by Mitsubishi Chemical Corporation, maleic acid-modified polyethylene, MFR = 1.3, density = 0.89)
Modified styrene polymer C2: Tuftec M1943 (manufactured by Asahi Kasei Co., Ltd., maleic acid modified styrene-ethylene-butadiene-styrene copolymer)

<Other additives>
Stabilizer: “Irganox B1171” manufactured by Ciba Specialty Chemicals
Mold release agent: “Montanic acid ester wax WE40” manufactured by Clariant Japan

  As a comparative polyethylene, Novatec HB-431 (manufactured by Nippon Polyethylene Co., Ltd., high density polyethylene)

(Examples 1-10, Comparative Examples 1-10)
The amount (parts by mass) of the raw materials (A) to (C) described above is as shown in Tables 1 and 2, and the amounts of other additives used are 0. 3 parts by mass and the release agent were 0.4 parts by mass, and these were mixed with a 35φ twin-screw extruder (manufactured by Toshiba Machine Co., Ltd.). Specifically, the raw materials (A) to (C) are mixed in advance and charged from the main hopper, and the cylinder temperature is 280 ° C. in the example using “polyamide 10T11 (A1)” as the copolymerized polyamide resin (A). In the examples using “Polyamide 10T11 (A2)” and “Polyamide 10T12 (A3)”, an example using “Polyamide 6 (A4)” and “Polyamide MXD6 (B1, B2)” is used without using 300 ° C. In the example using “Polyamide 66 (A5)”, the temperature was set to 260 ° C. And after cooling the strand discharged from the extruder with the water tank, it pelletized with the strand cutter and dried at 125 degreeC for 5 hours, and the polyamide resin composition was obtained as a pellet.

  Next, a molded product necessary for each evaluation was produced using the polyamide resin composition obtained above, and an evaluation result was obtained by the above-described evaluation method. The evaluation result of the polyamide resin composition obtained in Examples 1-10 and Comparative Examples 1-10 is shown in Tables 1-2.

  As is clear from Tables 1 and 2, it can be seen that the polyamide resin compositions of Examples 1 to 10 are flexible and excellent in barrier properties and do not generate cracks with respect to the calcium chloride cycle. On the other hand, the resin composition of Comparative Examples 1-10 was inferior in any evaluation item compared with Examples 1-10.

  Further, from the observation of the dispersion structure of Example 4 (FIG. 1), it can be confirmed that the polyamide MXD6 has a uniform phase-separated dispersion structure without adding a compatibilizer to the polyamide 10T11.

  The polyamide resin composition obtained by the present invention is excellent in barrier properties, fuel swellability, and chemical resistance, and can be used for various molded articles such as fuel containers, tubes, and fuel parts.

Claims (4)

Polyamide containing metaxylylene group-containing polyamide resin (B) 10 to 250 parts by mass, modified polyolefin and / or styrene copolymer (C) 0 to 100 parts by mass with respect to 100 parts by mass of copolymerized polyamide resin (A) A resin composition, wherein the copolymerized polyamide resin (A) includes a decanterephthalamide unit (a), an undecaneamide unit and / or a dodecaneamide unit (b), and the decanterephthalamide unit (a) The content is 50 to 98 mol% with respect to a total of 100 mol% of the unit (a) and the unit (b), and the content of the undecanamide unit and / or dodecanamide unit (b) is 2-50 mol% with respect to 100 mol% in total of the unit (a) and the unit (b) Resin composition. The content of the decanterephthalamide unit (a) is 75 to 98 mol% with respect to 100 mol% in total of the unit (a) and the unit (b), and the undecanamide unit and / or dodecanamide unit The polyamide resin composition according to claim 1, wherein the content of (b) is 2 to 25 mol% with respect to 100 mol% in total of the unit (a) and the unit (b). The copolymerized polyamide resin (A) includes a decanterephthalamide unit (a), an undecanamide unit and / or a dodecanamide unit (b), and another unit (c) containing an amino group and a carboxyl group, The content of the other unit (c) is 0 to 30 mol% with respect to 100 mol% in total of the unit (a), the unit (b) and the unit (c). The polyamide resin composition according to any one of the above. The polyamide resin composition according to any one of claims 1 to 3, which has a structure in which the metaxylylene group-containing polyamide resin (B) is independently dispersed in the copolymerized polyamide resin (A) matrix.