JP2008173881A - Multilayer blow-molded body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multilayer blow-molded body in which heat resistance, hot water resistance, chemical resistance, alcohol and gasoline permeability resistance, adhesion between layers, flexibility, conductivity or the like is excellent in balance. <P>SOLUTION: The multilayer blow-molded body of two or more layers comprises an outer layer consisting of a resin composition of following (A) and an inner layer consisting of a polyphenylene sulfide resin composition of following (B). (A): A resin composition at least contains (b) 5-300 pts.wt. of a polyamide resin and/or a saturated polyester resin based on (a) 100 pts.wt. of a polyphenylene sulfide resin. (B): A polyphenylene sulfide resin composition at least contains (c) 1-20 pts.wt. of a polyamide resin based on (a) 100 pts.wt. of a polyphenylene sulfide resin and is characterized in that (a) a polyphenylene sulfide resin forms a sea phase, (c) a polyamide resin forms an island phase, and the number mean dispersion particle diameter of (c) the polyamide resin is less than 500 nm. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a multilayer hollow molded article having excellent balance of heat resistance, hot water resistance, chemical resistance, alcohol-resistant gasoline permeability, interlayer adhesion, flexibility, conductivity and the like.

  Polyphenylene sulfide resin has excellent properties as engineering plastics such as excellent heat resistance, gasoline (alcohol gasoline) barrier properties, chemical resistance, electrical insulation properties, and heat and humidity resistance, mainly for injection molding and extrusion molding. It is used for various electric / electronic parts, machine parts and automobile parts. For example, hollow molded products of thermoplastic resins are manufactured by blow molding using polyamide resins, mainly in ducts in the engine compartment of automobiles, and saturated polyester resins, polyamide resins, polyolefins for automobile fuel tubes A technique of manufacturing by extrusion molding using a resin or a thermoplastic polyurethane resin has become widespread.

  However, conventional single-layer hollow molded products made of thermoplastic resins such as polyamide resins, saturated polyester resins, polyolefin resins and thermoplastic polyurethane resins have insufficient heat resistance, hot water resistance, chemical resistance, etc. Therefore, since the range to be applied is limited, a product having further improved heat resistance, hot water resistance, chemical resistance and the like is required.

  Especially for automobile fuel tubes, polyamide resins, especially flexible polyamide resins such as polyamide 11 and polyamide 12, are widely used. However, when the polyamide resin is used alone, it is required for environmental pollution problems and fuel consumption improvement. Concerns have been pointed out that the permeation-preventing properties of alcohol gasoline are not sufficient, and improvements are desired. Also, in applications where non-conductive liquids such as fuel flow through blow hollow molded bodies and tube molded bodies, the molded body may be charged, and to suppress this, conductivity can be simultaneously imparted to the hollow molded body. May be required.

  In recent years, tubes for outer layer nylon and inner layer ETFE have been developed as a technology for improving the low alcohol gasoline permeability. However, ETFE is expensive and has a higher alcohol gasoline permeability than polyphenylene sulfide resin, which is more advanced and less expensive. Today, ETFE barrier materials have become inadequate for alcohol-gasoline permeability.

  In view of this, multilayer hollow molded articles having improved fuel barrier properties such as alcohol gasoline utilizing the high chemical resistance and low ETFE ratio possessed by polyphenylene sulfide resins have recently been studied (Patent Document 1). ~ 8).

  However, since polyphenylene sulfide resin is relatively poor in toughness, the polyphenylene sulfide resin itself has high barrier properties but lacks flexibility required for tubes and the like. When an elastomer is added to compensate for this, the barrier inherent in polyphenylene sulfide resin is There was a problem that the performance decreased.

In the present invention, in order to compensate for this, a resin such as polyamide is nano-dispersed in the polyphenylene sulfide resin in the presence of a specific compatibilizing agent, thereby improving the toughness without significantly impairing the barrier property of the polyphenylene sulfide resin. Technology. In the details of Patent Documents 1 to 8, there is a description that a polyamide resin may be blended with the polyphenylene sulfide resin, but the resin such as polyamide is nano-dispersed in the polyphenylene sulfide resin in the presence of a specific compatibilizing agent. There is no description on the fact that the toughness can be improved without significantly impairing the barrier properties of the polyphenylene sulfide resin.
JP 59-145131 (examination request), JP 10-138372 A (examination request), JP 10-296889 A (examination request), JP 2002-267054 A (claim of examination) JP 2003-21275 (examination request) JP 2004-169851 A (examination request) JP-A-2004-202865 (examination request) JP 2004-285905 A (examination request)

  The present invention eliminates the above-mentioned conventional problems, and maintains the heat resistance, hot water resistance, chemical resistance, and alcohol gasoline permeability characteristics of the polyphenylene sulfide resin while maintaining adhesion between layers, flexibility, and conductivity. It is an object of the present invention to provide a multilayer hollow molded body having excellent properties and the like.

As a result of intensive studies to solve the above problems, the present inventors have reached the present invention. That is, the present invention is a polyphenylene sulfide resin-based multilayer hollow molded article having the following constitution.
(1) A multilayer hollow molded article having two or more layers composed of an outer layer comprising the following (A) resin composition and an inner layer comprising the following (B) polyphenylene sulfide resin composition.
(A): (a) A resin composition containing at least 5 to 300 parts by weight of a polyamide resin and / or a saturated polyester resin with respect to 100 parts by weight of a polyphenylene sulfide resin.
(B): (a) a polyphenylene sulfide resin composition containing at least 1 to 20 parts by weight of a polyamide resin with respect to 100 parts by weight of the polyphenylene sulfide resin, wherein (a) the polyphenylene sulfide resin is a sea phase; The polyphenylene sulfide resin composition is characterized in that the polyamide resin forms an island phase, and the number average dispersed particle size of the (c) polyamide resin is less than 500 nm.
(2) The (A) resin composition is a resin composition comprising 110 to 280 parts by weight of (b) a polyamide resin and / or a saturated polyester resin with respect to 100 parts by weight of the (a) polyphenylene sulfide resin, b) The multilayer hollow molded article according to (1), which is a resin composition having a polyamide resin and / or a saturated polyester resin as a sea phase.
(3) (b) The polyamide resin and / or the saturated polyester resin is a polyamide resin having a carbon number of 8 to 15 per amide group, and is either (1) or (2) The multilayer hollow molded article described.
(4) The multilayer hollow molded article according to (3), wherein the polyamide resin is polydodecanamide (nylon 12) and / or polyundecanamide (nylon 11).
(5) The resin composition (A) contains at least one functional group selected from (d) an epoxy group, an acid anhydride group, a carboxyl group and a salt thereof with respect to 100 parts by weight of the (a) polyphenylene sulfide resin. The multilayer hollow molded article according to any one of (1) to (4), wherein 1 to 200 parts by weight of the resin to be used is contained.
(6) (d) A resin having at least one functional group selected from an epoxy group, an acid anhydride group, a carboxyl group and a salt thereof contains (d1) an epoxy group-containing olefin copolymer as an essential component. The multilayer hollow molded article according to (5), wherein
(7) (d) a resin containing at least one functional group selected from an epoxy group, an acid anhydride group, a carboxyl group and a salt thereof is (d1) an epoxy group-containing olefin copolymer and (d2) an acid. An anhydride group-containing olefin copolymer is contained as an essential component, and the weight ratio of (d1) and (d2) is (d1) :( d2) = 1 to 99: 99-1 ( 6) The multilayer hollow molded article according to the above.
(8) (A) The resin composition further contains (e) an elastomer that does not contain any functional group selected from an epoxy group, an acid anhydride group, a carboxyl group, and a salt thereof, and (a) 100 parts by weight of a polyphenylene sulfide resin. 1 to 200 parts by weight of the multilayer hollow molded article according to any one of (1) to (7).
(9) (e) The elastomer which does not contain any functional group selected from an epoxy group, an acid anhydride group, a carboxyl group and a salt thereof includes an olefin copolymer having a density of 880 kg / m ³ or less. The multilayer hollow molded article according to (8).
(10) The multilayer hollow molded article according to any one of (1) to (9), wherein the (A) resin composition further contains (f) a plasticizer.
(11) The number average dispersed particle size of (b) the polyamide resin after the (B) polyphenylene sulfide resin composition is melt-retained at 300 ° C. for 30 minutes, is any one of (1) to (10) Multi-layer hollow molded body.
(12) (B) The polyphenylene sulfide resin composition further comprises (g) a compound having at least one functional group selected from an epoxy group, an amino group and an isocyanate group with respect to 100 parts by weight of the polyphenylene sulfide resin. 0.1 to 30 parts by weight of the multilayer hollow molded article according to any one of (1) to (11).
(13) (g) The compound having at least one functional group selected from an epoxy group, an amino group and an isocyanate group is a compound containing one or more isocyanate groups or a compound containing two or more epoxy groups (12) The multilayer hollow molded article described.
(14) (c) The multilayer hollow molded article according to any one of (1) to (13), wherein the polyamide resin is at least one selected from the group consisting of copolymerized polyamide, nylon 610, and nylon 612.
(15) Any of (A) resin composition and (B) polyphenylene sulfide resin composition is a non-conductive resin composition having a volume resistivity of 10 ¹² Ω · cm or more. The multilayer hollow molded article described.
(16) The multilayer according to any one of (1) to (15), wherein the melt viscosity of (a) polyphenylene sulfide resin exceeds 80 Pa · s (under conditions of 310 ° C. and a shear rate of 1000 / s). Hollow molded body.
(17) (C) The volume resistivity exceeds 100 Ω · cm and is not more than 10 ¹⁰ Ω · cm on the inner side of the outer layer made of (A) resin composition and the inner layer made of (B) polyphenylene sulfide resin composition. The multilayer hollow molded article according to any one of (1) to (16), wherein there are three or more layers in which a layer made of a certain conductive thermoplastic resin composition is present.
(18) (C) The conductive thermoplastic resin composition is a resin composition comprising (h) 1 to 70 parts by weight of a conductive filler with respect to 100 parts by weight of a thermoplastic resin. The multilayer hollow molded article described.
(19) The multilayer hollow molded article according to any one of (17) and (18), wherein (C) the conductive thermoplastic resin composition is (a) a resin composition containing a polyphenylene sulfide resin.
(20) The multilayer hollow molded article according to any one of (1) to (19), which is produced by a coextrusion molding method.
(21) The multilayer hollow molded body according to any one of (1) to (20), wherein the multilayer hollow molded body is any one selected from an automobile fuel tube, a fuel filler hose, and an LLC (long life coolant) tube.

  According to the present invention, while maintaining chemical resistance and alcohol gasoline permeability, a multilayer hollow molded article having excellent balance between interlayer adhesion, flexibility, conductivity and the like can be obtained.

Details of the embodiment of the present invention will be described below.
First, the (A) resin composition constituting the outer layer will be described.

(A) Polyphenylene sulfide resin (a) Polyphenylene sulfide resin, which is an essential component constituting the layer (A) in the present invention, is a polymer having a repeating unit represented by the following structural formula (I),

From the viewpoint of heat resistance, a polymer containing 70 mol% or more, more preferably 90 mol% or more of a polymer containing a repeating unit represented by the above structural formula is preferred. Further, (a) the polyphenylene sulfide resin may be composed of a repeating unit having the following structure in an amount of less than 30 mol% of the repeating unit.

  Since the polyphenylene sulfide resin copolymer having a part of the structure has a low melting point, such a resin composition is advantageous in terms of moldability.

  (A) Although there is no restriction | limiting in particular in the melt viscosity of (a) polyphenylene sulfide resin used with a resin composition, Usually 3 Pa * s (310 degreeC, shear rate 1000 / s)-1000 Pa * s are used. In addition, the melt viscosity in this invention is the value measured using the Toyo Seiki Co., Ltd. capilograph on the conditions of 310 degreeC and the shear rate of 1000 / s.

Although the manufacturing method of (a) polyphenylene sulfide resin used for this invention is demonstrated below, if (a) polyphenylene sulfide resin of the said structure is obtained, it will not be limited to the following method.
First, the contents of the polyhalogen aromatic compound, sulfidizing agent, polymerization solvent, molecular weight regulator, polymerization aid and polymerization stabilizer used in the production method will be described.

[Polyhalogenated aromatic compounds]
A polyhalogenated aromatic compound refers to a compound having two or more halogen atoms in one molecule. Specific examples include p-dichlorobenzene, m-dichlorobenzene, o-dichlorobenzene, 1,3,5-trichlorobenzene, 1,2,4-trichlorobenzene, 1,2,4,5-tetrachlorobenzene, hexa Polyhalogenated aromatics such as chlorobenzene, 2,5-dichlorotoluene, 2,5-dichloro-p-xylene, 1,4-dibromobenzene, 1,4-diiodobenzene, 1-methoxy-2,5-dichlorobenzene Group compounds, and preferably p-dichlorobenzene is used. Further, it is possible to combine two or more different polyhalogenated aromatic compounds into a copolymer, but it is preferable to use a p-dihalogenated aromatic compound as a main component.

  The polyhalogenated aromatic compound is used in an amount of 0.9 to 2.0 mol, preferably 0.95 to 1. mol per mol of sulfidizing agent, from the viewpoint of obtaining a (a) PPS resin having a viscosity suitable for processing. A range of 5 moles, more preferably 1.005 to 1.2 moles can be exemplified.

[Sulfiding agent]
Examples of the sulfiding agent include alkali metal sulfides, alkali metal hydrosulfides, and hydrogen sulfide. Specific examples of the alkali metal sulfide include lithium sulfide, sodium sulfide, potassium sulfide, rubidium sulfide, cesium sulfide and a mixture of two or more of these, and sodium sulfide is preferably used. These alkali metal sulfides can be used as hydrates or aqueous mixtures or in the form of anhydrides.

  Specific examples of the alkali metal hydrosulfide include, for example, sodium hydrosulfide, potassium hydrosulfide, lithium hydrosulfide, rubidium hydrosulfide, cesium hydrosulfide and a mixture of two or more of these. Preferably used. These alkali metal hydrosulfides can be used as hydrates or aqueous mixtures or in the form of anhydrides.

  In addition, an alkali metal sulfide prepared in situ in a reaction system from an alkali metal hydrosulfide and an alkali metal hydroxide can also be used. Moreover, an alkali metal sulfide can be prepared from an alkali metal hydrosulfide and an alkali metal hydroxide, and this can be transferred to a polymerization tank and used.

  Alternatively, an alkali metal sulfide prepared in situ in a reaction system from an alkali metal hydroxide such as lithium hydroxide or sodium hydroxide and hydrogen sulfide can also be used. Further, an alkali metal sulfide can be prepared from an alkali metal hydroxide such as lithium hydroxide or sodium hydroxide and hydrogen sulfide, and transferred to a polymerization tank for use.

  The amount of the sulfidizing agent charged means a residual amount obtained by subtracting the loss from the actual charged amount when a partial loss of the sulfiding agent occurs before the start of the polymerization reaction due to dehydration operation or the like.

  An alkali metal hydroxide and / or an alkaline earth metal hydroxide can be used in combination with the sulfidizing agent. Specific examples of the alkali metal hydroxide include sodium hydroxide, potassium hydroxide, lithium hydroxide, rubidium hydroxide, cesium hydroxide, and a mixture of two or more thereof. Specific examples of the metal hydroxide include, for example, calcium hydroxide, strontium hydroxide, barium hydroxide, and sodium hydroxide is preferably used.

  When an alkali metal hydrosulfide is used as the sulfiding agent, it is particularly preferable to use an alkali metal hydroxide at the same time, but the amount used is 0.95 to 1. A range of 20 mol, preferably 1.00 to 1.15 mol, more preferably 1.005 to 1.100 mol can be exemplified.

[Polymerization solvent]
An organic polar solvent is preferably used as the polymerization solvent. Specific examples include N-alkylpyrrolidones such as N-methyl-2-pyrrolidone and N-ethyl-2-pyrrolidone, caprolactams such as N-methyl-ε-caprolactam, and 1,3-dimethyl-2-imidazolide. Non-, N, N-dimethylacetamide, N, N-dimethylformamide, hexamethylphosphoric acid triamide, dimethyl sulfone, tetramethylene sulfoxide and the like, and mixtures thereof, and the like are all included. It is preferably used because of its high reaction stability. Of these, N-methyl-2-pyrrolidone (hereinafter sometimes abbreviated as NMP) is particularly preferably used.

  The amount of the organic polar solvent used is selected in the range of 2.0 to 10 mol, preferably 2.25 to 6.0 mol, more preferably 2.5 to 5.5 mol per mol of the sulfidizing agent.

[Molecular weight regulator]
(A) A monohalogen compound (not necessarily an aromatic compound) is used as the polyhalogenated aromatic compound for the purpose of forming a terminal of the polyphenylene sulfide resin to be formed or adjusting the polymerization reaction or molecular weight. Can be used together.

[Polymerization aid]
In order to obtain (a) polyphenylene sulfide resin having a relatively high degree of polymerization in a shorter time, it is also one of preferred embodiments to use a polymerization aid. Here, the polymerization assistant means a substance having an action of increasing the viscosity of the obtained (a) polyphenylene sulfide resin. Specific examples of such polymerization aids include, for example, organic carboxylates, water, alkali metal chlorides, organic sulfonates, alkali metal sulfates, alkaline earth metal oxides, alkali metal phosphates and alkaline earths. Metal phosphates and the like. These may be used alone or in combination of two or more. Of these, organic carboxylates, water, and alkali metal chlorides are preferable. Further, alkali metal carboxylates are preferable as organic carboxylates, and lithium chloride is preferable as alkali metal chlorides.

  The alkali metal carboxylate is a general formula R (COOM) n (wherein R is an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group, an aryl group, an alkylaryl group, or an arylalkyl group). M is an alkali metal selected from lithium, sodium, potassium, rubidium and cesium, and n is an integer of 1 to 3). Alkali metal carboxylates can also be used as hydrates, anhydrides or aqueous solutions. Specific examples of the alkali metal carboxylate include, for example, lithium acetate, sodium acetate, potassium acetate, sodium propionate, lithium valerate, sodium benzoate, sodium phenylacetate, potassium p-toluate, and mixtures thereof. Can be mentioned. The alkali metal carboxylate is an organic acid and one or more compounds selected from the group consisting of alkali metal hydroxides, alkali metal carbonates, and alkali metal bicarbonates, and are allowed to react by adding approximately equal chemical equivalents. You may form by. Among the alkali metal carboxylates, lithium salts are highly soluble in the reaction system and have a large auxiliary effect, but are expensive, and potassium, rubidium and cesium salts are insufficiently soluble in the reaction system. Therefore, sodium acetate, which is inexpensive and has an appropriate solubility in the polymerization system, is most preferably used.

  When using these alkali metal carboxylates as polymerization aids, the amount used is usually in the range of 0.01 to 2 moles per mole of charged alkali metal sulfide, and in the sense of obtaining a higher degree of polymerization. The range of 0.1-0.6 mol is preferable, and the range of 0.2-0.5 mol is more preferable.

  Moreover, the addition amount in the case of using water as a polymerization aid is usually in the range of 0.3 mol to 15 mol with respect to 1 mol of the charged alkali metal sulfide, and in the sense of obtaining a higher degree of polymerization, 0.6 to The range of 10 mol is preferable, and the range of 1 to 5 mol is more preferable.

  Of course, two or more kinds of these polymerization aids can be used in combination. For example, when an alkali metal carboxylate and water are used in combination, a higher molecular weight can be obtained in a smaller amount.

  There is no particular designation as to the timing of addition of these polymerization aids, which may be added at any time during the previous step, polymerization start, polymerization in the middle to be described later, or may be added in multiple times. When using an alkali metal carboxylate as a polymerization aid, it is more preferable to add it at the start of the previous step or at the start of the polymerization from the viewpoint of easy addition. When water is used as a polymerization aid, it is effective to add the polyhalogenated aromatic compound during the polymerization reaction after charging.

[Polymerization stabilizer]
A polymerization stabilizer can also be used to stabilize the polymerization reaction system and prevent side reactions. The polymerization stabilizer contributes to stabilization of the polymerization reaction system and suppresses undesirable side reactions. One measure of the side reaction is the generation of thiophenol, and the addition of a polymerization stabilizer can suppress the generation of thiophenol.

  Specific examples of the polymerization stabilizer include compounds such as alkali metal hydroxides, alkali metal carbonates, alkaline earth metal hydroxides, and alkaline earth metal carbonates. Among these, alkali metal hydroxides such as sodium hydroxide, potassium hydroxide, and lithium hydroxide are preferable. Since the alkali metal carboxylate described above also acts as a polymerization stabilizer, it is one of the polymerization stabilizers. In addition, when an alkali metal hydrosulfide is used as a sulfidizing agent, it has been described above that it is particularly preferable to use an alkali metal hydroxide at the same time. Oxides can also be polymerization stabilizers.

  These polymerization stabilizers can be used alone or in combination of two or more. The polymerization stabilizer is usually in a proportion of 0.02 to 0.2 mol, preferably 0.03 to 0.1 mol, more preferably 0.04 to 0.09 mol, relative to 1 mol of the charged alkali metal sulfide. Is preferably used. If this ratio is small, the stabilizing effect is insufficient. Conversely, if the ratio is too large, it is economically disadvantageous or the polymer yield tends to decrease.

  The addition timing of the polymerization stabilizer is not particularly specified, and may be added at any time during the previous step, at the start of polymerization, or during the polymerization described later, or may be added in multiple times. It is more preferable to add at the start of the process or at the start of the polymerization from the viewpoint of easy addition.

  Next, the production method of the (a) polyphenylene sulfide resin used in the present invention will be specifically described in the order of the pre-process, the polymerization reaction process, the recovery process, and the post-treatment process.

[pre-process]
(A) In the method for producing a polyphenylene sulfide resin, the sulfiding agent is usually used in the form of a hydrate. Before adding the polyhalogenated aromatic compound, a mixture containing an organic polar solvent and the sulfiding agent is added. It is preferable to raise the temperature and remove excess water out of the system.

  As described above, a sulfidizing agent prepared from an alkali metal hydrosulfide and an alkali metal hydroxide in situ in the reaction system or in a tank different from the polymerization tank is also used as the sulfidizing agent. Can do. Although there is no particular limitation on this method, desirably an alkali metal hydrosulfide and an alkali metal hydroxide are added to the organic polar solvent in an inert gas atmosphere at a temperature ranging from room temperature to 150 ° C., preferably from room temperature to 100 ° C. In addition, there is a method in which the temperature is raised to at least 150 ° C. or more, preferably 180 to 260 ° C. under normal pressure or reduced pressure, and water is distilled off. A polymerization aid may be added at this stage. Moreover, in order to accelerate | stimulate distillation of a water | moisture content, you may react by adding toluene etc.

  The amount of water in the polymerization system in the polymerization reaction is preferably 0.3 to 10.0 moles per mole of the charged sulfidizing agent. Here, the amount of water in the polymerization system is an amount obtained by subtracting the amount of water removed from the polymerization system from the amount of water charged in the polymerization system. In addition, the water to be charged may be in any form such as water, an aqueous solution, and crystal water.

[Polymerization reaction step]
(A) A polyphenylene sulfide resin is produced by reacting a sulfidizing agent and a polyhalogenated aromatic compound in an organic polar solvent within a temperature range of 200 ° C. or higher and lower than 290 ° C.

  When starting the polymerization reaction step, the organic polar solvent, the sulfidizing agent, and the polyhalogenated aromatic compound are desirably mixed in an inert gas atmosphere at room temperature to 240 ° C., preferably 100 to 230 ° C. . A polymerization aid may be added at this stage. The order in which these raw materials are charged may be out of order or may be simultaneous.

  The mixture is usually heated to a temperature in the range of 200 ° C to 290 ° C. Although there is no restriction | limiting in particular in a temperature increase rate, Usually, the speed of 0.01-5 degreeC / min is selected, and the range of 0.1-3 degreeC / min is more preferable.

  In general, the temperature is finally raised to a temperature of 250 to 290 ° C., and the reaction is usually carried out at that temperature for 0.25 to 50 hours, preferably 0.5 to 20 hours.

  In the stage before reaching the final temperature, for example, a method of reacting at 200 to 260 ° C. for a certain time and then raising the temperature to 270 to 290 ° C. is effective in obtaining a higher degree of polymerization. Under the present circumstances, as reaction time in 200 to 260 degreeC, the range of 0.25 to 20 hours is normally selected, Preferably the range of 0.25 to 10 hours is selected.

  In order to obtain a polymer having a higher degree of polymerization, it may be effective to perform polymerization in multiple stages. When the polymerization is performed in a plurality of stages, it is effective that the conversion of the polyhalogenated aromatic compound in the system at 245 ° C. reaches 40 mol% or more, preferably 60 mol%.

The conversion rate of the polyhalogenated aromatic compound (herein abbreviated as PHA) is a value calculated by the following formula. The residual amount of PHA can usually be determined by gas chromatography.
(A) When polyhalogenated aromatic compound is added excessively in a molar ratio with respect to the alkali metal sulfide, the conversion rate = [PHA charge (mol) −PHA remaining amount (mol)] / [PHA charge (mol) -PHA excess (mole)]
(B) In cases other than (A) above, conversion rate = [PHA charge (mol) −PHA remaining amount (mol)] / [PHA charge (mol)]

[Recovery process]
(A) In the method for producing a polyphenylene sulfide resin, after the polymerization is completed, a solid is recovered from a polymerization reaction product containing a polymer, a solvent, and the like. (A) Any known recovery method may be adopted for the polyphenylene sulfide resin.

  For example, after completion of the polymerization reaction, a method of slowly cooling and recovering the particulate polymer may be used. Although there is no restriction | limiting in particular in the slow cooling rate in this case, Usually, it is about 0.1 degree-C / min-about 3 degree-C / min. There is no need for slow cooling at the same rate in the entire process of the slow cooling step, and a method of slow cooling at a rate of 0.1 to 1 ° C./minute until the polymer particles crystallize and then 1 ° C./minute or more is used. It may be adopted.

Moreover, it is also one of the preferable methods to perform said collection | recovery on quenching conditions, As a preferable method of this collection method, the flash method is mentioned. In the flash method, the polymerization reaction product is flushed from a high temperature and high pressure (usually 250 ° C. or more, 8 kg / cm ² or more) into an atmosphere of normal pressure or reduced pressure, and the polymer is recovered in the form of powder simultaneously with the solvent recovery. This is a method, and the term “flash” here means that a polymerization reaction product is ejected from a nozzle. Specific examples of the atmosphere to be flushed include nitrogen or water vapor at normal pressure, and the temperature is usually in the range of 150 ° C to 250 ° C.

[Post-processing process]
(A) The polyphenylene sulfide resin may be produced through the above polymerization and recovery steps and then subjected to acid treatment, hot water treatment or washing with an organic solvent.

  When acid treatment is performed, it is as follows. The acid used for the acid treatment of (a) polyphenylene sulfide resin is not particularly limited as long as it does not have an action of decomposing (a) polyphenylene sulfide resin. Acetic acid, hydrochloric acid, sulfuric acid, phosphoric acid, silicic acid, carbonic acid and propyl Examples of the acid include acetic acid and hydrochloric acid, but (a) a polyphenylene sulfide resin such as nitric acid that decomposes and deteriorates is not preferable.

  As the acid treatment method, there is a method of immersing (a) polyphenylene sulfide resin in acid or an aqueous solution of acid, and stirring or heating can be appropriately performed as necessary. For example, when acetic acid is used, a sufficient effect can be obtained by immersing the PPS resin powder in an aqueous PH4 solution heated to 80 to 200 ° C. and stirring for 30 minutes. The PH after processing may be 4 or more, for example, about PH 4-8. The acid-treated (a) polyphenylene sulfide resin is preferably washed several times with water or warm water in order to remove residual acid or salt. The water used for washing is preferably distilled water or deionized water in the sense that it does not impair the advantageous chemical modification effect of (a) polyphenylene sulfide resin by acid treatment.

  When performing hot water treatment, it is as follows. (A) When the polyphenylene sulfide resin is hydrothermally treated, the temperature of the hot water is preferably 100 ° C. or higher, more preferably 120 ° C. or higher, still more preferably 150 ° C. or higher, and particularly preferably 170 ° C. or higher. If it is less than 100 ° C., the effect of the preferred chemical modification of (a) polyphenylene sulfide resin is small, which is not preferable.

  The water used is preferably distilled water or deionized water in order to exhibit the effect of preferable chemical modification of the (a) polyphenylene sulfide resin by hot water washing. There are no particular restrictions on the operation of the hot water treatment, and a predetermined amount of (a) polyphenylene sulfide resin is charged into a predetermined amount of water, heated and stirred in a pressure vessel, and continuously subjected to hot water treatment. Done. (A) The ratio of the polyphenylene sulfide resin and water is preferably as much as possible, but usually a bath ratio of (a) 200 g or less of polyphenylene sulfide resin is selected for 1 liter of water.

  Further, since the decomposition of the terminal group is not preferable, the treatment atmosphere is preferably an inert atmosphere in order to avoid this. Furthermore, it is preferable that the (a) PPS resin that has finished this hot water treatment operation is washed several times with warm water in order to remove the remaining components.

  When washing with an organic solvent, it is as follows. (A) The organic solvent used for washing the polyphenylene sulfide resin is not particularly limited as long as it does not have an action of decomposing the (a) polyphenylene sulfide resin. For example, N-methyl-2-pyrrolidone, dimethylformamide, dimethyl Nitrogen-containing polar solvents such as acetamide, 1,3-dimethylimidazolidinone, hexamethylphosphoramide, piperazinones, sulfoxide / sulfon solvents such as dimethyl sulfoxide, dimethyl sulfone, sulfolane, acetone, methyl ethyl ketone, diethyl ketone, acetophenone, etc. Ketone solvents, ether solvents such as dimethyl ether, dipropyl ether, dioxane, tetrahydrofuran, chloroform, methylene chloride, trichloroethylene, ethylene dichloride, perchlorethylene Halogen solvents such as monochloroethane, dichloroethane, tetrachloroethane, perchlorethane, chlorobenzene, alcohols such as methanol, ethanol, propanol, butanol, pentanol, ethylene glycol, propylene glycol, phenol, cresol, polyethylene glycol, polypropylene glycol -Phenol solvents and aromatic hydrocarbon solvents such as benzene, toluene, xylene and the like. Among these organic solvents, use of N-methyl-2-pyrrolidone, acetone, dimethylformamide, chloroform and the like is particularly preferable. These organic solvents are used alone or in combination of two or more.

  As a method of washing with an organic solvent, there is a method of immersing (a) polyphenylene sulfide resin in an organic solvent, and stirring or heating can be appropriately performed if necessary. There is no restriction | limiting in particular about the washing | cleaning temperature at the time of wash | cleaning (a) polyphenylene sulfide resin with an organic solvent, Arbitrary temperature of about normal temperature-about 300 degreeC can be selected. Although the cleaning efficiency tends to increase as the cleaning temperature increases, a sufficient effect is usually obtained at a cleaning temperature of room temperature to 150 ° C. It is also possible to wash under pressure in a pressure vessel at a temperature above the boiling point of the organic solvent. There is no particular limitation on the cleaning time. Depending on the cleaning conditions, in the case of batch-type cleaning, a sufficient effect can be obtained usually by cleaning for 5 minutes or more. It is also possible to wash in a continuous manner.

  In this invention, you may use the polyphenylene sulfide resin which introduce | transduced the alkaline earth metal salt, such as Ca, into the polyphenylene sulfide resin. As a method for introducing the alkaline earth metal salt, a method of adding an alkaline earth metal salt before, during, or after the previous step, before the polymerization step, during the polymerization step, after the polymerization step, in the polymerization vessel Or a method of adding an alkaline earth metal salt at the beginning, middle, or last stage of the washing step. Among them, the easiest method is a method of adding an alkaline earth metal salt after removing residual oligomers and residual salts by washing with an organic solvent or washing with warm water or hot water. The alkaline earth metal salt is preferably introduced into the polyphenylene sulfide resin in the form of alkaline earth metal ions such as acetate, hydroxide and carbonate. It is preferable to remove excess barium ions by washing with warm water. The alkaline earth metal ion concentration at the time of introducing the alkaline earth metal ion is preferably 0.001 mmol or more, more preferably 0.01 mmol or more with respect to 1 g of PPS. As temperature, 50 degreeC or more is preferable, 75 degreeC or more is more preferable, and 90 degreeC or more is especially preferable. Although there is no upper limit temperature, it is usually preferably 280 ° C. or lower from the viewpoint of operability. The bath ratio (the weight of the cleaning liquid relative to the weight of the dry polyphenylene sulfide resin) is preferably 0.5 or more, more preferably 3 or more, and still more preferably 5 or more.

  (A) The polyphenylene sulfide resin can be used after having been polymerized to have a high molecular weight by heating in an oxygen atmosphere and thermal oxidation crosslinking treatment by heating with addition of a crosslinking agent such as peroxide.

  When the dry heat treatment is performed for the purpose of increasing the molecular weight by thermal oxidation crosslinking, the temperature is preferably 160 to 260 ° C, more preferably 170 to 250 ° C. The oxygen concentration is preferably 5% by volume or more, more preferably 8% by volume or more. Although there is no restriction | limiting in particular in the upper limit of oxygen concentration, About 50 volume% is a limit. The treatment time is preferably 0.5 to 100 hours, more preferably 1 to 50 hours, and further preferably 2 to 25 hours. The heat treatment apparatus may be a normal hot air dryer or a heating apparatus with a rotary type or a stirring blade. However, for efficient and more uniform processing, a heating apparatus with a rotary type or a stirring blade is used. More preferably it is used.

  In addition, it is possible to carry out dry heat treatment for the purpose of suppressing thermal oxidative crosslinking and removing volatile matter. The temperature is preferably 130 to 250 ° C, and more preferably 160 to 250 ° C. In this case, the oxygen concentration is preferably less than 5% by volume, and more preferably less than 2% by volume. The treatment time is preferably 0.5 to 50 hours, more preferably 1 to 20 hours, and further preferably 1 to 10 hours. The heat treatment apparatus may be a normal hot air dryer or a heating apparatus with a rotary type or a stirring blade. However, for efficient and more uniform processing, a heating apparatus with a rotary type or a stirring blade is used. More preferably it is used.

  Examples of the preferred (a) polyphenylene sulfide resin used in the present invention include Toray Industries, Ltd. M2588, M2888, M2088, T1881, L2120, L2480, M2100, M2900, M3910, L2520, and L4230.

(B) Polyamide Resin and / or Saturated Polyester Resin Among the (b) polyamide resin and / or saturated polyester resin, which are essential components constituting the layer (A) in the present invention, the polyamide resin will be described first.

  The polyamide resin is a polyamide mainly composed of amino acid, lactam or diamine and dicarboxylic acid. Representative examples of the main constituents include amino acids such as 6-aminocaproic acid, 11-aminoundecanoic acid, 12-aminododecanoic acid and paraaminomethylbenzoic acid, lactams such as ε-aminocaprolactam and ω-laurolactam, tetramethylenediamine, hexamylene Diamine, 2-methylpentamethylenediamine, undecamethylenediamine, dodecamethylenediamine, 2,2,4- / 2,4,4-trimethylhexamethylenediamine, 5-methylnonamethylenediamine, metaxylenediamine, paraxylylene Amine, 1,3-bis (aminomethyl) cyclohexane, 1,4-bis (aminomethyl) cyclohexane, 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexane, bis (4-aminocyclohexyl) methane Aliphatic, alicyclic, such as bis (3-methyl-4-aminocyclohexyl) methane, 2,2-bis (4-aminocyclohexyl) propane, bis (aminopropyl) piperazine, aminoethylpiperazine, 2-methylpentamethylenediamine, Aromatic diamines and adipic acid, peric acid, azelaic acid, sebacic acid, dodecanedioic acid, terephthalic acid, isophthalic acid, 2-chloroterephthalic acid, 2-methylterephthalic acid, 5-methylisophthalic acid, 5-sodium sulfo Aliphatic, alicyclic, and aromatic dicarboxylic acids such as isophthalic acid, hexahydroterephthalic acid, hexahydroisophthalic acid, and dimer acid are listed. In the present invention, polyamide homopolymer or copolymer derived from these raw materials is used. Are used alone or in the form of a mixture. Door can be.

  In the present invention, useful polyamide resins include polycaproamide (nylon 6), polyhexamethylene adipamide (nylon 66), polytetramethylene adipamide (nylon 46), polyhexamethylene sebamide (nylon 610). ), Polyhexamethylene dodecamide (nylon 612), polydodecanamide (nylon 12), polyundecanamide (nylon 11), polyhexamethylene terephthalamide (nylon 6T), polyxylylene adipamide (nylon XD6) and these Or a mixture thereof.

  Among them, a polyamide resin composed of a structural unit having 8 to 15 carbon atoms per amide group is preferable, and a polyamide resin using aminocarboxylic acid or a derivative thereof as a monomer obtains better low temperature toughness. Particularly preferred in terms of meaning. Examples of such polyamides include polydodecanamide (nylon 12) and polyundecanamide (nylon 11).

  The degree of polymerization of these polyamide resins is not particularly limited, and the relative viscosity measured at 25 ° C. in a 98% concentrated sulfuric acid solution (1 g of polymer, concentrated sulfuric acid 100 ml) is in the range of 1.5 to 7.0, particularly 2.0. A polyamide resin in the range of ˜6.5, more preferably in the range of 2.5 to 5.5, or in a metacresol (polymer concentration of 0.5% by weight), with a relative viscosity of 1.0 to 7.0 measured at 25 ° C. A polyamide resin in the range, particularly in the range of 1.5 to 5.0, is preferred.

  Next, the saturated polyester resin will be described. The saturated polyester resin used in the present invention refers to a polyester obtained from a dicarboxylic acid such as terephthalic acid and an aliphatic diol. Examples of dicarboxylic acids other than terephthalic acid include C2-C20 aliphatic dicarboxylic acids such as azelaic acid, sebacic acid, adipic acid, dodecanedicarboxylic acid, and isophthalic acid, and aromatic dicarboxylic acids such as isophthalic acid and naphthalenedicarboxylic acid. Or alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid, and these may be used alone or in a mixture. Examples of the aliphatic diol include ethylene glycol, propylene glycol, 1,4-butanediol, trimethylene glycol, 1,4-cyclohexanedimethanol and hexamethylene glycol.

  Examples of preferred saturated polyester resins used in the present invention include polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyhexamethylene terephthalate, polycyclohexylene dimethylene terephthalate, polyethylene naphthalate, etc. Particularly preferred is a copolyester comprising a polybutylene terephthalate or terephthalic acid having a strength of 60 mol% or more, preferably 70 mol% or more, a dicarboxylic acid component containing dodecanedicarboxylic acid and / or isophthalic acid, and a 1,4-butanediol component. used.

The degree of polymerization of these saturated polyester resins is not particularly limited. For example, in the case of polybutylene terephthalate (hereinafter abbreviated as PBT resin) and copolymerized polyester that are preferably used, the degree of polymerization is 0.5% orthochlorophenol. The relative viscosity of the solution measured at 25 ° C. is preferably in the range of 0.5 to 2.5, particularly in the range of 0.8 to 2.0. In the case of polyethylene terephthalate, the intrinsic viscosity of a 0.5% orthochlorophenol solution measured at 25 ° C. is preferably in the range of 0.54 to 1.5, particularly preferably in the range of 0.6 to 1.2.
In the resin composition constituting the layer (A) of the present invention, the blending amount of the (b) polyamide resin and / or the saturated polyester resin with respect to 100 parts by weight of the (a) polyphenylene sulfide resin is in the range of 5 to 300 parts by weight. Yes, the range of 110-280 parts by weight is more preferred, and the range of 150-250 parts by weight is even more preferred. When the blending amount of (b) polyamide resin and / or saturated polyester resin is less than 5 weights with respect to 100 weight parts of (a) polyphenylene sulfide resin, the toughness of the resin composition is poor, and in the range of 300 weight parts or more, (B) inner layer composition This is not preferable because the adhesiveness with the product is extremely poor. Among these, the range of 110 to 280 parts by weight is particularly preferable in view of the balance between toughness and interlayer adhesion.

  In the present invention, the resin composition constituting the layer (A) has at least one functional group selected from (d) an epoxy group, an acid anhydride group, a carboxyl group and a salt thereof in the sense of imparting higher toughness. It is also one of the preferable aspects to mix | blend resin containing this. As the resin containing at least one functional group selected from an epoxy group, an acid anhydride group, a carboxyl group and a salt thereof, at least one function selected from an epoxy group, an acid anhydride group, a carboxyl group and a salt thereof is used. A thermoplastic resin containing a group, silicone oil, silicone rubber or the like is preferably used.

  First, a thermoplastic resin containing at least one functional group selected from an epoxy group, an acid anhydride group, a carboxyl group and a salt thereof will be described.

  The thermoplastic resin containing at least one functional group selected from an epoxy group, an acid anhydride group, a carboxyl group and a salt thereof in the present invention is selected from an epoxy group, an acid anhydride group, a carboxyl group and a salt thereof. Examples thereof include an olefin polymer and a fluorine polymer containing at least one kind.

  Epoxy group-containing polyolefin polymers include olefin copolymers having glycidyl esters, glycidyl ethers, glycidyl diamines, etc. in the side chain, and double bond portions of olefin copolymers having double bonds. Among them, olefin copolymers in which a monomer having an epoxy group is copolymerized are preferred, and in particular, olefins mainly composed of α-olefins and glycidyl esters of α, β-unsaturated acids. A copolymer is preferably used.

Specific examples of such α-olefins include ethylene, propylene, butene-1, 4-methylpentene-1, hexene-1, decene-1, octene-1, and the like. Among these, ethylene is preferably used. Moreover, these can also use 2 or more types simultaneously.
On the other hand, glycidyl ester of α, β-unsaturated acid is a general formula

(Wherein R represents a hydrogen atom or a lower alkyl group), specifically, glycidyl acrylate, glycidyl methacrylate, glycidyl ethacrylate, and the like, among which glycidyl methacrylate is preferably used. .

  Such an olefin-based copolymer mainly composed of an α-olefin and an α, β-unsaturated glycidyl ester is a random, block, graft of the α-olefin and an α, β-unsaturated glycidyl ester. Any copolymerization mode may be used.

  The amount of copolymerization of glycidyl ester of α, β-unsaturated acid in an olefin copolymer mainly composed of glycidyl ester of α-olefin and α, β-unsaturated acid has an influence on the intended effect, From the viewpoints of polymerizability, gelation, heat resistance, fluidity, influence on strength, etc., 0.5 to 40% by weight, particularly 3 to 30% by weight is preferable. In the present invention, as an epoxy group-containing olefin copolymer, in addition to α-olefin (1) and glycidyl ester (2) of α, β-unsaturated acid, monomer (3) represented by the following general formula is further added. An epoxy group-containing olefin copolymer as an essential component is also preferably used.

(Wherein R ¹ represents hydrogen or a lower alkyl group, X represents a group selected from —COOR ² group, —CN group or aromatic group, and R ² represents a C 1-10 alkyl group. )

  The details of the α-olefin (1) and the α, β-unsaturated glycidyl ester (2) used in the olefin copolymer are the same as those of the epoxy group-containing polyolefin polymer.

  On the other hand, specific examples of the monomer (3) include methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, t-butyl acrylate, isobutyl acrylate, methyl methacrylate. Α, β-unsaturated carboxylic acid alkyl esters such as ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, t-butyl methacrylate, isobutyl methacrylate, acrylonitrile, styrene, α-methyl Examples thereof include styrene, styrene having an aromatic ring substituted with an alkyl group, and acrylonitrile-styrene copolymer, and two or more of these may be used simultaneously.

  Such an olefin copolymer is a random or / and block or / and graft copolymer of an α-olefin (1), a glycidyl ester (2) of an α, β-unsaturated acid, and a monomer (3). For example, the monomer (3) seems to be graft copolymerized with a random copolymer of α-olefin (1) and glycidyl ester (2) of α, β-unsaturated acid. Moreover, the copolymer in which 2 or more types of copolymerization modes were combined may be sufficient.

  The copolymerization ratio of the olefin copolymer is α-olefin (1) / α, β from the viewpoint of influence on the target effect, polymerization, gelation, heat resistance, fluidity, influence on strength, and the like. -Glycidyl ester of unsaturated acid (2) = 60-99 wt% / 40-1 wt% is preferably selected. Further, the copolymerization ratio of the monomer (3) is such that the total amount of the glycidyl ester (2) of the α-olefin (1) and the α, β-unsaturated acid is 95 to 40% by weight. A range of 5 to 60% by weight is preferably selected.

  In addition, as a polyolefin polymer containing a carboxyl group and a salt thereof and an acid anhydride group suitably used in the present invention, polyethylene, polypropylene, polystyrene, ethylene-propylene copolymer, ethylene-butene copolymer, polybutene, Ethylene-propylene-diene copolymer, styrene-butadiene copolymer, styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), polybutadiene, butadiene-acrylonitrile copolymer , Polyisoprene, Butene-Isoprene Copolymer, and Polyolefin Trees such as Styrene-Ethylene-Butylene-Styrene Block Copolymer (SEBS), Styrene-Ethylene-Propylene-Styrene Block Copolymer (SEPS) Olefin copolymer obtained by copolymerizing maleic anhydride, succinic anhydride, fumaric anhydride, acrylic acid, methacrylic acid, vinyl acetate and salts thereof such as Na, Zn, K, Ca, Mg, etc. More specifically, ethylene- (meth) acrylic acid copolymers, and metal salts thereof such as Na, Zn, K, Ca, Mg, ethylene-maleic anhydride copolymers, ethylene-butene- Maleic anhydride copolymer, ethylene-propylene-maleic anhydride copolymer, propylene-maleic anhydride copolymer, or maleic anhydride modified SBS, SIS, SEBS, SEPS, ethylene-ethyl acrylate copolymer Examples include coalescence.

  The copolymerization mode of such an olefin copolymer is not particularly limited, and any copolymer mode such as a random copolymer, a graft copolymer, or a block copolymer may be used.

  Among these, as a thermoplastic resin containing (d) at least one functional group selected from an epoxy group, an acid anhydride group, a carboxyl group and a salt thereof, (d1) an epoxy group-containing olefin copolymer is cost-effective. It is particularly preferably used in terms of toughness.

  Further, as the resin containing (d) a functional group, the simultaneous use of both (d1) an epoxy group-containing olefin copolymer and (d2) an acid anhydride group-containing olefin copolymer has higher toughness. (A) It is preferable when obtaining a resin composition. In this case, the weight ratio of (d1) to (d2) is preferably in the range of (d1) :( d2) = 1 to 99: 99-1 in order to express the synergistic effect of toughness.

  Next, a silicone oil containing at least one functional group selected from an epoxy group, an acid anhydride group, a carboxyl group and a salt thereof will be described.

Silicone oil is generally an organosilicon compound having a linear siloxane structure as a skeleton and having an organic group directly bonded to the silicon. As an organic group directly bonded to silicon, a methyl group, an ethyl group, a phenyl group, a vinyl group, a trifluoropropyl group, and a combination thereof are known. In the present invention, a silicone oil in which a part of the organic group is substituted with a substituent having an epoxy group, an acid anhydride group, a carboxyl group, and a salt thereof is preferably used.
Such silicone oils are known to have a wide range of viscosities ranging from 0.65 to 1 million mm 2 / s (25 ° C.). Although there is no restriction | limiting in particular in the viscosity of silicone oil in this invention, The thing of 10-10000 mm2 / s (25 degreeC) is preferable, and the thing of 10-5000 mm2 / s (25 degreeC) is especially excellent in a softness | flexibility and hot water resistance. This is preferable in terms of obtaining an improvement effect or handling.

  Specific examples of such functional group-containing silicone oils include SF8411, SF8413, BY16-855, BY16-855B, BY16-839, SF8421EG, BY16-845, SF8418, BY16-750, manufactured by Toray Dow Corning Silicone. it can.

  Next, a silicone rubber containing at least one functional group selected from an epoxy group, an acid anhydride group, a carboxyl group and a salt thereof will be described.

  The silicone rubber may be any of organic peroxide curing type, addition curing type, and condensation curing type, but a platinum group metal catalyst is used because it can be molded in a short time and has excellent mass productivity. The liquid addition-curable silicone rubber contained is preferable. Moreover, you may use what added the adhesion adjuvant to the addition curable silicone rubber composition from the point of strengthening adhesiveness.

  The addition-curable liquid silicone rubber composition includes a liquid diorganopolysiloxane having two or more alkenyl groups such as vinyl groups in one molecule, and one molecule of hydrogen atom (SiH group) bonded to a silicon atom. A known addition-curable liquid silicone rubber composition containing a liquid organohydrogenpolysiloxane having two or more, preferably three or more, and a platinum group metal-based addition reaction catalyst such as a platinum compound as essential components. Obtained and commercially available, for example, KE1950-40A / B, KE1950-50A / B, KE2000-40A / B, KE2000-50A / B, KE1935A / B, KER1987A / B (manufactured by Shin-Etsu Chemical Co., Ltd.) And two liquid mixture type of B liquid).

  Examples of the adhesion assistant include at least one selected from alkenyl groups such as vinyl groups, (meth) acryloxy groups, hydrosilyl groups (SiH groups), epoxy groups, alkoxysilyl groups, carbonyl groups, and phenyl groups. May be an organic silicon compound such as a silane having two or more functional groups and a linear or cyclic siloxane having 2 to 30 silicon atoms, preferably about 4 to 20 silicon atoms.

The silicone rubber containing at least one functional group selected from an epoxy group, an acid anhydride group, a carboxyl group, and a salt thereof is one in which a functional group is introduced into the silicone rubber, and the introduction method is not particularly limited. Although there is no method, for example, a method of adding and reacting an alkoxysilane having an epoxy group, an acid anhydride group, a carboxyl group and a salt thereof can be mentioned.
Specific examples of such functional group-containing silicone rubbers include “Trefill” E-601 manufactured by Toray Dow Corning Silicone.

  The blending amount of the resin containing at least one functional group selected from the above (d) epoxy group, acid anhydride group, carboxyl group and salt thereof is from the viewpoint of flexibility, surface smoothness, extrusion moldability, etc. (A) The range of 1-200 weight part is preferable with respect to 100 weight part of polyphenylene sulfide resin, More preferably, the range of 1-100 weight part, More preferably, the range of 25-90 weight part is selected.

  In the sense of imparting higher flexibility to the resin composition constituting the layer (A) of the present invention, (e) using an elastomer containing no epoxy group, acid anhydride group, carboxyl group and salt thereof It is effective in obtaining more excellent flexibility, particularly low temperature flexibility and extrusion moldability.

  (E) When using an elastomer that does not contain an epoxy group, an acid anhydride group, a carboxyl group and a salt thereof, or a carboxylic acid ester group, from the viewpoint of improving compatibility with the matrix resin, (d) an epoxy group or an acid anhydride group It is preferable to use in combination with a resin containing at least one functional group selected from carboxyl groups and salts thereof.

  Examples of such elastomers that do not contain (e) epoxy groups, acid anhydride groups, carboxyl groups and salts thereof include, for example, polyolefin elastomers, diene elastomers, silicone rubbers, fluorine rubbers, urethane rubbers, polyurethane thermoplastic elastomers, polyesters Based thermoplastic elastomers, polyamide based thermoplastic elastomers, silicone rubbers and the like.

  Specific examples of polyolefin elastomers include olefins such as ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-hexene copolymer, ethylene-octene copolymer, polybutene, and ethylene-propylene-diene copolymer. Examples thereof include a system copolymer.

The use of an olefin copolymer having a density of 880 kg / m ³ or less as such an olefin copolymer is particularly effective in expressing high toughness at low temperatures.

  Specific examples of the diene elastomer include styrene-butadiene copolymer, polybutadiene, butadiene-acrylonitrile copolymer, polyisoprene, butene-isoprene copolymer, and SBS, SIS, SEBS, SEPS and the like.

  Of these, ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-hexene copolymer, ethylene-octene copolymer, and ethylene-propylene-diene copolymer are particularly preferable.

  Further, (e) two or more kinds of elastomers which do not contain any of epoxy group, acid anhydride group, carboxyl group and salt thereof may be used in combination.

  (E) When using an elastomer that does not contain any functional group of an epoxy group, an acid anhydride group, a carboxyl group, and a salt thereof, the preferred blending amount is from the viewpoint of flexibility, extrusion molding, and surface smoothness. a) The range of 1 to 200 parts by weight is selected with respect to 100 parts by weight of the polyphenylene sulfide resin, 5 to 100 parts by weight is more preferable, and 10 to 80 parts by weight is more preferable. However, (d) an olefin copolymer containing a functional group and (e) an epoxy group from the viewpoint of balancing the heat resistance, chemical resistance, alcohol resistance to gasoline penetration and flexibility of the polyphenylene sulfide resin. The total of the elastomer containing no acid anhydride group, carboxyl group and salt thereof is preferably 200 parts by weight or less, more preferably 150 parts by weight or less with respect to 100 parts by weight of the (a) PPS resin.

  It is also effective to add (f) a plasticizer to the resin composition constituting the layer (A) of the present invention in the sense of imparting higher flexibility.

The plasticizer (f) that can be used in the present invention is not particularly limited as long as it is a plasticizer that is generally effective for polyphenylene sulfide resins, polyamide resins, and saturated polyester resins.
Illustrative examples include compounds of formula II) and polyhydric alcohols.

@ 0005
(Wherein R1 to R6 are

A group selected from a sulfonamide group represented by the formula: -OH group, an ester group represented by -COOR9, hydrogen, a halogen group, an alkyl group having 1 to 20 carbon atoms, an alkenyl group, an aralkyl group, and an aromatic group. Here, R7 and R8 represent hydrogen or a group selected from an alkyl group having 1 to 20 carbon atoms, an alkenyl group, an aralkyl group, and an aromatic group. R9 represents a group selected from an alkyl group having 1 to 20 carbon atoms, an alkenyl group, an aralkyl group, and an aromatic group. However, at least one of R1 to R6 is a group selected from the sulfonamide group, —OH group, and ester group. )

  Specific examples of the compound of the formula (II) include N-butylbenzenesulfonamide, N-ethylbenzenesulfonamide, N-ethyl-o, p-toluenesulfonamide, N, N′-dibutylbenzenesulfonamide, N— Examples thereof include aromatic sulfonamides such as propylbenzenesulfonamide, hydroxybenzoic acid esters such as p-hydroxybenzoic acid-n-octyl ester and p-hydroxybenzoic acid-2-ethylhexyl ester. Polyhydric alcohol is a compound having two or more hydroxyl groups in the molecule, and specific examples thereof include ethylene glycol, glycerin, 2-methyl-2,4-pentanediol, 2,2,4-trimethyl. -1,3-pentanediol and the like. Among them, aromatic sulfonamides such as N-butylbenzenesulfonamide, N-ethylbenzenesulfonamide, N-ethyl-o, p-toluenesulfonamide, N, N′-dibutylbenzenesulfonamide, and N-propylbenzenesulfonamide are particularly preferable. preferable.

  The blending amount of (f) plasticizer is a total of 100 weights of (a) polyphenylene sulfide resin and (b) polyamide resin and / or saturated polyester resin, from the balance of flexibility imparting effect, volatilization during extrusion molding, and suppression of foaming. The range of (f) 1 to 25 parts by weight of the plasticizer is preferably selected with respect to parts, more preferably 4 to 20 parts by weight, and still more preferably 8 to 17 parts by weight.

  There is no particular limitation on the melt kneading method of the resin composition (A), but for example, a mixture of raw materials is supplied to a generally known melt mixer such as a single-screw or twin-screw extruder, a Banbury mixer, a kneader, and a mixing roll. A typical example is a method of kneading at a temperature of 160 to 340 ° C.

  In addition, in obtaining excellent surface smoothness, a thermoplastic resin containing at least one functional group selected from (a) polyphenylene sulfide resin and (d) epoxy group, acid anhydride group, carboxyl group and salt thereof (B) containing at least one functional group selected from an epoxy group, an acid anhydride group, a carboxyl group, and a salt thereof. A method of melt-kneading the remaining thermoplastic resin, or heat containing at least one functional group selected from (a) a polyphenylene sulfide resin and (d) an epoxy group, an acid anhydride group, a carboxyl group and a salt thereof A composition obtained by melt-kneading a part of a plastic resin, (b) a polyamide resin and / or a saturated polyester resin, and (d) an epoxy group Prepare separately the composition obtained by melt-kneading the remainder of the thermoplastic resin containing at least one functional group selected from acid anhydride group, carboxyl group and salt thereof, and then melt both compositions again The kneading method is extremely effective.

  Also, (a) a polyphenylene sulfide resin, (d) a thermoplastic resin containing at least one functional group selected from an epoxy group, an acid anhydride group, a carboxyl group and a salt thereof, and (e) an epoxy group, an acid anhydride A composition obtained by melting and kneading a part or all of an elastomer containing neither a physical group, a carboxyl group or a salt thereof, and (b) a polyamide resin and / or a saturated polyester resin, or (d) A method of melt-kneading the (e) and the remainder of the (f) is also effective.

  When performing such multi-stage kneading, (a) a thermoplastic resin containing at least one functional group selected from (a) polyphenylene sulfide resin, (d) epoxy group, acid anhydride group, carboxyl group and salt thereof, (b) polyamide There are no particular restrictions on the kneading order of the compounds other than the resin and / or the saturated polyester resin.

  Further, as the multi-stage kneading method, there may be mentioned a method in which the first-stage compound is supplied from the main hopper and the second-stage compound is supplied from the side feeder.

Furthermore, when a small amount of additive component is used, it is of course possible to knead and pelletize other components by the above-described method, etc., and then add them before the molding process.
Next, the (B) polyphenylene sulfide resin composition constituting the inner layer will be described.

  (B) About (a) polyphenylene sulfide resin, which is an essential component of the polyphenylene sulfide resin composition, has a structure basically equivalent to (a) polyphenylene sulfide resin used in the above (A) resin composition, The typical manufacturing method is also the same. However, the (a) polyphenylene sulfide resin used in the (A) resin composition and the (a) polyphenylene sulfide resin used in the (B) polyphenylene sulfide resin composition are not necessarily identical in physical properties such as melt viscosity, crystallization speed, and melting point. Need not be.

  (B) The melt viscosity of the polyphenylene sulfide resin used in the polyphenylene sulfide resin composition is not particularly limited, but in the sense of obtaining higher flexibility, 80 Pa · s (310 ° C., shear rate 1000 / s) is used. Those exceeding the range are preferably used, more preferably 150 Pa · s or more. In addition, the melt viscosity in this invention is the value measured using the Toyo Seiki Co., Ltd. capilograph on the conditions of 310 degreeC and the shear rate of 1000 / s.

  Examples of the preferable (a) polyphenylene sulfide resin include M2588, M2888, M2088, T1881, L2120, L2480, M2100, M2900, and L2520 manufactured by Toray Industries, Inc. (B) (c) Polyamide resin, which is another essential component of the polyphenylene sulfide resin composition, improves the toughness of the polyphenylene sulfide resin by blending such components, and in forming a tubular body such as a tube, It is effective for imparting toughness to the tubular body without significantly impairing the chemical resistance.

  (B) (c) Polyamide resin, which is another essential component of the polyphenylene sulfide resin composition, has a structure basically equivalent to (b) Polyamide resin used in (A) resin composition. The typical manufacturing method is also the same. However, the (b) polyamide resin used in the (A) resin composition and the (c) polyamide resin used in the (B) polyphenylene sulfide resin composition are not necessarily identical in physical properties such as melt viscosity, crystallization speed, and melting point. There is no need. In addition, nylon 6 is used as a homopolyamide resin, and a copolymer obtained by copolymerizing nylon 6 with other polyamide components as a copolymerized polyamide is more preferably used for developing excellent toughness. Nylon 6/66 copolymer having a high toughness developing effect and a nylon 6 copolymer amount higher than that of nylon 66 is particularly preferably used. The copolymerization ratio of the nylon 6/66 copolymer is particularly preferably in the range of nylon 6 component / nylon 66 component = 95/5 to 65/35 in weight ratio.

  Since nylon 610 and nylon 612 have excellent thermal stability and relatively high flexibility, they are also mentioned as preferred polyamide resins.

  On the other hand, in the case where (c) the polyamide resin is a repeating unit constituting the polyamide resin, a polyamide having 11 or more carbon atoms per amide group, such as polyamide 11 or polyamide 12, exhibits particularly excellent toughness. Not very good. This is presumed that the interaction between the polyphenylene sulfide resin and the polyamide resin is an interaction between the polyphenylene sulfide resin and the amide group, and if the amide group concentration is too low, the affinity with the polyphenylene sulfide resin is reduced. .

  The degree of polymerization of the (c) polyamide resin used in the (B) polyphenylene sulfide resin composition in the present invention is not particularly limited, but from the standpoint of better toughness, conditions of 1% and 25 ° C. in concentrated sulfuric acid It is preferable to use a polyamide having a relative viscosity of 1.5 or more, more preferably a relative viscosity of 1.8 to 5.5.

  The blending amount of the (c) polyamide resin ranges from 1 to 20 parts by weight with respect to 100 parts by weight of the (a) polyphenylene sulfide resin in order to balance excellent flexibility and alcohol-resistant gasoline permeability at a high level. More preferred is a range of 2 to 15 parts by weight. (C) When the blending amount of the polyamide resin is 20 parts by weight or more, it is not preferable because the excellent properties such as heat-and-moisture resistance, fluidity and gasohole barrier properties of the polyphenylene sulfide resin are impaired, and (c) blending of the polyamide resin If the amount is less than 1 part by weight, the effect of toughness is significantly reduced, which is not preferable.

  The (B) polyphenylene sulfide resin composition of the present invention has excellent flexibility as well as excellent heat resistance, chemical resistance and alcohol-resistant gasoline permeability inherent in the (a) polyphenylene sulfide resin. In order to develop such characteristics, it is necessary that (a) the polyphenylene sulfide resin forms a sea phase (continuous phase or matrix), and (c) the polyamide resin forms an island phase (dispersed phase). Furthermore, it is essential that the number average dispersed particle diameter of the (c) polyamide resin is less than 500 nm, preferably 300 nm or less, more preferably 200 nm or less. The lower limit is preferably 1 nm or more from the viewpoint of productivity. (C) When the number average dispersed particle size of the polyamide resin is in the range of 500 nm or more, the flexibility improving effect is remarkably impaired.

  The (B) polyphenylene sulfide resin composition of the present invention has stable and excellent flexibility even when recycled. In order to develop such characteristics, (a) polyphenylene sulfide resin forms a sea phase (continuous phase or matrix) even in a molded piece that has been injection molded and then pulverized and injection molded again. (C) It is necessary for the polyamide resin to form an island phase (dispersed phase). Furthermore, (c) the number average dispersed particle size of the polyamide resin is preferably less than 500 nm, more preferably 300 nm or less, and even more preferably 200 nm or less. The lower limit is preferably 1 nm or more from the viewpoint of productivity. (C) When the number average dispersed particle size of the polyamide resin is in the range of 500 nm or more, the flexibility improving effect is remarkably impaired.

  Here, the number average dispersed particle size is as follows: (a) ASTM No. 4 test piece is molded at a molding peak temperature of polyphenylene sulfide resin + 20 ° C., and a thin piece of 0.1 μm or less at −20 ° C. from the center. Is cut in the direction of the cross-sectional area of the dumbbell piece, and is magnified 10,000 to 20,000 times with a Hitachi H-7100 transmission electron microscope (resolution (particle image) 0.38 nm, magnification of 500 to 600,000 times) As for any 100 dispersed parts of (c) polyamide resin when observed, first, the maximum diameter and the minimum diameter are measured, and the average value is set as the dispersed particle diameter, and then the average value is obtained. The number average dispersed particle size.

  The (B) polyphenylene sulfide resin composition of the present invention improves the compatibility of (a) the polyphenylene sulfide resin and (c) the polyamide resin, (c) improves the dispersibility of the polyamide resin, and obtains higher toughness. In the above, it is also useful to add (g) a compound having one or more groups selected from an epoxy group, an amino group, and an isocyanate group.

  Epoxy group-containing compounds include bisphenol A, resorcinol, hydroquinone, pyrocatechol, bisphenol F, saligenin, 1,3,5-trihydroxybenzene, bisphenol S, trihydroxy-diphenyldimethylmethane, 4,4′-dihydroxybiphenyl, 1 , 5-dihydroxynaphthalene, cashew phenol, glycidyl ethers of bisphenols such as 2,2,5,5-tetrakis (4-hydroxyphenyl) hexane, those using halogenated bisphenol instead of bisphenol, butanediol di Glycidyl ether epoxy compounds such as glycidyl ether, glycidyl ester compounds such as glycidyl phthalate, glycidyl amine compounds such as N-glycidyl aniline, etc. Glycidyl epoxy resins, epoxidized polyolefins, linear epoxy compounds such as epoxidized soybean oil, vinylcyclohexene dioxide, such as a non-glycidyl epoxy resins ring system such as dicyclopentadiene dioxide and the like.

  In addition, other novolac type epoxy resins are also included. The novolac type epoxy resin has two or more epoxy groups and is usually obtained by reacting a novolac type phenol resin with epichlorohydrin. Moreover, a novolac type phenol resin is obtained by a condensation reaction of phenols and formaldehyde. Although there is no restriction | limiting in particular as phenols of a raw material, Phenol, o-cresol, m-cresol, p-cresol, bisphenol A, resorcinol, p-tertiary butylphenol, bisphenol F, bisphenol S, and these condensates are mentioned.

  Moreover, the olefin copolymer which has an epoxy group is also mentioned. Examples of the olefin copolymer having an epoxy group (epoxy group-containing olefin copolymer) include an olefin copolymer obtained by introducing a monomer component having an epoxy group into an olefinic (co) polymer. . Moreover, the copolymer which epoxidized the double bond part of the olefin polymer which has a double bond in a principal chain can also be used.

  Examples of functional group-containing components for introducing a monomer component having an epoxy group into an olefinic (co) polymer include glycidyl acrylate, glycidyl methacrylate, glycidyl ethacrylate, glycidyl itaconate, glycidyl citraconic acid, etc. And a monomer containing an epoxy group.

  The method for introducing these epoxy group-containing components is not particularly limited, and methods such as copolymerization with α-olefin and the like, or graft introduction to an olefin (co) polymer using a radical initiator can be used.

  The introduction amount of the monomer component containing an epoxy group is 0.001 to 40 mol%, preferably 0.01 to 35 mol% with respect to the whole monomer as a raw material of the epoxy group-containing olefin copolymer. It is appropriate to be within the range.

  As an epoxy group-containing olefin copolymer particularly useful in the present invention, an olefin copolymer having an α-olefin and a glycidyl ester of an α, β-unsaturated carboxylic acid as a copolymerization component is preferably exemplified. As said alpha olefin, ethylene is mentioned preferably.

  These copolymers further include α, β-unsaturated carboxylic acids such as acrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, methacrylic acid, methyl methacrylate, ethyl methacrylate, butyl methacrylate, and the like. It is also possible to copolymerize the alkyl ester, styrene, acrylonitrile and the like.

  Such an olefin copolymer may be any random, alternating, block, or graft copolymerization mode.

  An olefin copolymer obtained by copolymerizing an glycidyl ester of an α-olefin and an α, β-unsaturated carboxylic acid is, among others, a glycidyl ester 1 of 60 to 99% by weight of an α-olefin and an α, β-unsaturated carboxylic acid. An olefin copolymer obtained by copolymerizing ˜40% by weight is particularly preferable.

  Specific examples of the glycidyl ester of α, β-unsaturated carboxylic acid include glycidyl acrylate, glycidyl methacrylate, and glycidyl ethacrylate. Among them, glycidyl methacrylate is preferably used.

  As a specific example of an olefin copolymer having an α-olefin and a glycidyl ester of α, β-unsaturated carboxylic acid as an essential copolymerization component, an ethylene / propylene-g-glycidyl methacrylate copolymer ("g" Representing graft, the same applies hereinafter), ethylene / butene-1-g-glycidyl methacrylate copolymer, ethylene-glycidyl methacrylate copolymer-g-polystyrene, ethylene-glycidyl methacrylate copolymer-g-acrylonitrile-styrene copolymer Polymer, ethylene-glycidyl methacrylate copolymer-g-PMMA, ethylene / glycidyl acrylate copolymer, ethylene / glycidyl methacrylate copolymer, ethylene / methyl acrylate / glycidyl methacrylate copolymer, ethylene / methyl methacrylate / Glycidi methacrylate Copolymers thereof.

  Furthermore, the alkoxysilane which has an epoxy group is mentioned. Specific examples of such compounds include epoxy group-containing alkoxysilanes such as γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, and β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane. A compound etc. can be illustrated.

  Examples of the amino group-containing compound include alkoxysilanes having an amino group. Specific examples of such compounds include amino group-containing alkoxysilanes such as γ- (2-aminoethyl) aminopropylmethyldimethoxysilane, γ- (2-aminoethyl) aminopropyltrimethoxysilane, and γ-aminopropyltrimethoxysilane. Compound etc. are mentioned. Examples of the compound containing at least one isocyanate group include isocyanate compounds such as 2,4-tolylene diisocyanate, 2,5-tolylene diisocyanate, diphenylmethane-4,4′-diisocyanate, polymethylene polyphenyl polyisocyanate, and γ-isocyanate. Propyltriethoxysilane, γ-isocyanatopropyltrimethoxysilane, γ-isocyanatopropylmethyldimethoxysilane, γ-isocyanatopropylmethyldiethoxysilane, γ-isocyanatopropylethyldimethoxysilane, γ-isocyanatopropylethyldiethoxysilane, γ-isocyanate An isocyanate group-containing alkoxysilane compound such as propyltrichlorosilane can be exemplified.

  Among them, in order to obtain a stable and highly flexible effect, it is preferably at least one compound selected from a compound containing one or more isocyanate groups or a compound containing two or more epoxy groups, and further contains one isocyanate group. It is more preferable that it is a compound containing above. In the present invention, the blending amount of the component (g) is 0.1 to 30 parts by weight with respect to 100 parts by weight of the polyphenylene sulfide resin (a) in order to promote fine dispersion of the polyamide resin and to develop better toughness. It is preferable to add, and it is more preferable to add 0.2 to 5 parts by weight.

  As a method for preparing such a (B) polyphenylene sulfide resin composition, melt kneading is carried out by supplying it to a generally known melt kneader such as a single screw, twin screw extruder, Banbury mixer, kneader, and mixing roll (a). A typical example is a method of kneading at a melting temperature of the polyphenylene sulfide resin + a processing temperature of 5 to 100 ° C. Among them, melt kneading by a twin screw extruder is preferable.

  In order to further finely disperse the polyamide resin (c), it is preferable that the shearing force is relatively strong. Specifically, the kneading portion is two or more, preferably three or more, more preferably four. A method of kneading using a twin screw extruder having more than one part so that the resin temperature at the time of mixing is (a) the melting peak temperature of the polyphenylene sulfide resin +10 to 70 ° C. can be preferably used.

  At this time, the mixing order of the raw materials is not particularly limited, and a method in which all raw materials are blended and then melt kneaded by the above method, a part of the raw materials are blended and melt kneaded by the above method, and further the remaining raw materials Any method may be used, such as a method of blending and melt-kneading a mixture of materials, or a method of mixing the remaining raw materials using a side feeder during melt-kneading with a single-screw or twin-screw extruder after blending some raw materials. Good. As for the small amount additive component, other components can be kneaded by the above-mentioned method and pelletized, then added before molding and used for molding.

  Moreover, in order to make the dispersion of the polyamide resin finer, (c) melt-kneading once, and then melt-kneading once more are raised as a preferred method for producing the (B) polyphenylene sulfide resin composition of the present invention. . Although the upper limit of the number of kneading is not particularly limited, it is preferable from the viewpoint of flexibility improvement effect and economy that kneading once to three times after melt-kneading once.

  Furthermore, after melt-kneading once as described above, 0.02 part or more of water is added to 100 parts by weight of the total of (a) polyphenylene sulfide resin and (c) polyamide resin when melt-kneading once more. Is a more preferable production method. When 0.02 part or more of water is blended, the gas derived from the oligomer or by-product contained in the (B) polyphenylene sulfide resin composition of the present invention is easily removed, and the film, sheet, tubular body, etc. This improves the melt moldability of various processed products. The upper limit of the amount of water is not particularly limited, but is preferably 0.02 part or more and less than 2 parts from the viewpoint of kneadability and pressure increase in the extruder due to water vapor.

Both the (A) resin composition and the (B) polyphenylene sulfide resin composition thus obtained are non-conductive resins having a volume resistivity of 10 ¹² Ω · cm or more unless a conductive material is blended. When the composition becomes a composition and spark caused by charging does not become a problem, such a multilayer hollow molded body, particularly a two-layer hollow molded body composed of (A) outer layer / (B) inner layer is useful.

On the other hand, in applications where there is concern about sparks due to electrification, (C) the volume resistivity exceeds 100 Ω · cm on the inner side of (A) the outer layer made of the resin composition and (B) the inner layer made of the polyphenylene sulfide resin composition. A multilayer hollow molded article having three or more layers in which a layer made of a conductive thermoplastic resin composition having a density of 10 ¹⁰ Ω · cm or less is also useful.

  (C) Although there is no restriction | limiting in particular as resin used as the base of an electroconductive thermoplastic resin composition, Usually polyamide resin, especially nylon 11,12, fluorine-type resin, especially ETFE (ethylene tetrafluoroethylene copolymer), Polyphenylene sulfide resins and mixtures thereof are preferred.

  (C) When the resin used as the base of the conductive thermoplastic resin composition is ETFE, an alloy having an ETFE / polyphenylene sulfide resin = 5 to 95/95 to 5 weight ratio is provided between the (B) layer and the (C) layer. Arranging the composition layer is also useful for improving the adhesion between the quantity layers.

  (C) In order to impart conductivity to the conductive thermoplastic resin composition, it is preferable to blend (h) a conductive filler with 100 parts by weight of the base thermoplastic resin.

(H) The conductive filler is not particularly limited as long as it is a conductive filler that is usually used for conducting a resin. Specific examples thereof include metal powder, metal flake, metal ribbon, metal fiber, metal oxide, Examples thereof include an inorganic filler coated with a conductive substance, carbon powder, graphite, carbon fiber, carbon flake, and scaly carbon. Specific examples of metal species of metal powder, metal flakes, and metal ribbons include silver, nickel, copper, zinc, aluminum, stainless steel, iron, brass, chromium, and tin. Specific examples of the metal species of the metal fiber include iron, copper, stainless steel, aluminum, and brass. Such metal powders, metal flakes, metal ribbons, and metal fibers may be surface-treated with a surface treatment agent such as titanate, aluminum, or silane. Specific examples of the metal oxide include SnO ₂ (antimony dope), In ₂ O ₃ (antimony dope), ZnO (aluminum dope), etc., and these are surface treatment agents such as titanate, aluminum and silane. Surface treatment may be performed.

Specific examples of the conductive material in the inorganic filler coated with the conductive material include aluminum, nickel, silver, carbon, SnO ₂ (antimony doped), and In ₂ O ₃ (antimony doped). Examples of the inorganic filler to be coated include mica, glass beads, glass fiber, carbon fiber, potassium titanate whisker, barium sulfate, zinc oxide, titanium oxide, aluminum borate whisker, zinc oxide whisker, titanic acid whisker, Examples thereof include silicon carbide whiskers. Examples of the coating method include vacuum deposition, sputtering, electroless plating, and baking. These may be surface-treated with a titanate-based, aluminum-based or silane-based surface treatment agent.

Carbon powders are classified into acetylene black, gas black, oil black, naphthalene black, thermal black, furnace black, lamp black, channel black, roll black, disc black, etc., depending on the raw materials and production method. The carbon powder that can be used in the present invention is not particularly limited in its raw material and production method, but acetylene black and furnace black are particularly preferably used. In addition, various carbon powders having different characteristics such as particle diameter, surface area, DBP oil absorption, ash content and the like are manufactured. The carbon powder that can be used in the present invention is not particularly limited in these properties, but the average particle size is preferably 500 nm or less, particularly 5 to 100 nm, more preferably 10 to 70 nm, from the viewpoint of the balance between strength and electrical conductivity. . The surface area (BET method) is preferably 10 m ² / g or more, more preferably 30 m ² / g or more. The DBP oil supply amount is preferably 50 ml / 100 g or more, particularly preferably 100 ml / 100 g or more. The ash content is preferably 0.5% or less, particularly preferably 0.3% or less.

  Such carbon powder may be surface-treated with a surface treatment agent such as titanate, aluminum, or silane. It is also possible to use a granulated product to improve melt kneading workability.

  The innermost layer of a multilayer hollow molded body often requires surface smoothness. From this viewpoint, the conductive filler used in the present invention has a length / diameter ratio of 200 or less in a powdery, granular, plate-like, scale-like, or resin composition rather than a fibrous filler having a high aspect ratio. It is preferable that it is any form of the following.

  You may use the said conductive filler in combination of 2 or more types. Among these conductive fillers and conductive polymers, carbon black is particularly preferably used in terms of strength and cost.

  Since the content of the conductive filler used in the present invention varies depending on the type of the conductive filler used, it cannot be generally specified. However, from the viewpoint of balance between conductivity, fluidity, mechanical strength, etc., the base resin 100 A range of 1 to 70 parts by weight, more preferably 2 to 15 parts by weight, is selected with respect to parts by weight.

Such a conductive resin composition preferably has a volume resistivity of 10 ¹⁰ Ω · cm or less in order to obtain sufficient antistatic performance. However, the blending of the conductive filler generally tends to deteriorate strength and fluidity. Therefore, if the target conductivity level is obtained, it is desirable that the amount of the conductive filler and the conductive polymer is as small as possible. Although the target conductivity level varies depending on the application, the volume resistivity is usually in the range of more than ¹⁰⁰ Ω · cm and not more than 10 ¹⁰ Ω · cm.

  The (A) resin composition, (B) polyphenylene sulfide resin composition, and (C) conductive resin composition of the present invention are not essential components, but an inorganic filler is blended within a range that does not impair the effects of the present invention. Can also be used. Specific examples of such inorganic fillers include glass fiber, carbon fiber, carbon nanotube, carbon nanohorn, potassium titanate whisker, zinc oxide whisker, calcium carbonate whisker, wollastonite whisker, aluminum borate whisker, aramid fiber, alumina fiber, silicon carbide fiber. Fibrous fillers such as ceramic fiber, asbestos fiber, masonry fiber, metal fiber, or fullerene, talc, wollastonite, zeolite, sericite, mica, kaolin, clay, pyrophyllite, silica, bentonite, asbestos, Silicates such as alumina silicate, metal compounds such as silicon oxide, magnesium oxide, alumina, zirconium oxide, titanium oxide and iron oxide, carbonates such as calcium carbonate, magnesium carbonate and dolomite, sulfate Sulfates such as calcium and barium sulfate, hydroxides such as calcium hydroxide, magnesium hydroxide and aluminum hydroxide, glass beads, glass flakes, glass powder, ceramic beads, boron nitride, silicon carbide, carbon black and silica, graphite Non-fibrous fillers such as these may be used, and these inorganic fillers may be hollow, or two or more types may be used in combination. Further, these inorganic fillers may be used after being pretreated with a coupling agent such as an isocyanate compound, an organic silane compound, an organic titanate compound, an organic borane compound, and an epoxy compound. Of these, calcium carbonate, silica, and carbon black are preferable from the viewpoint of the anticorrosive material, the lubricant, and the effect of imparting conductivity.

  Furthermore, the (A) resin composition, (B) polyphenylene sulfide resin composition, and (C) conductive resin composition of the present invention are not essential components, but other additives that do not impair the effects of the present invention. You may add and mix. Specific examples include polybutylene terephthalate resin, polyethylene terephthalate resin, polyketone resin, polyarylate resin, liquid crystal polymer, polyetherketone resin, polythioetherketone resin, polyetheretherketone resin, polyimide resin, polyamideimide resin, And olefin polymers such as polyethylene resin and ethylene / butene copolymer, and copolymers.

  Moreover, the following compounds can be added for the purpose of modification. Plasticizers such as polyalkylene oxide oligomer compounds, thioether compounds, ester compounds, organophosphorus compounds, crystal nucleating agents such as organophosphorus compounds, polyetheretherketone, montanic acid waxes, lithium stearate, aluminum stearate Metal soaps such as ethylenediamine / stearic acid / sebacic acid polycondensate, release agents such as silicone compounds, anti-coloring agents such as hypophosphite, water, lubricants, UV protection agents, coloring agents, foaming A usual additive such as an agent can be blended. If any of the above compounds exceeds 20% by weight of the total composition, the original properties are impaired, so that it is not preferred, and 10% by weight or less, more preferably 1% by weight or less is added.

  Next, although the tubular molded body which is an example of the manufacturing method of the multilayer hollow molded body of the present invention will be described as an example, it is of course not limited to the following. That is, a melt extrusion resin extruded from an extruder is introduced into one tube die and extruded to obtain a multilayer tubular body.

  The polyphenylene sulfide resin multilayer hollow molded article of the present invention thus obtained is excellent in heat resistance, hot water resistance, chemical resistance, wear resistance, appearance of molded product, toughness, conductivity, bottles, tanks, ducts, etc. It is effective for automotive parts, electrical / electronic parts, and chemicals as an extrusion molding product such as blow molding products, pipes, tubes, etc., and fully exhibits the above characteristics of the tube for LLC (Long Life Coolant) or the present invention. It is preferably applied to a fuel tube application, particularly an automobile fuel tube in which automobile fuel flows, and a fuel filler hose application.

The present invention will be described more specifically with reference to the following examples.
In the following examples, the material properties were measured by the following measuring method.

[Morphological observation]
An ASTM No. 4 dumbbell piece of (B) polyphenylene sulfide resin composition was molded at a resin temperature of 310 ° C. and a mold temperature of 150 ° C. using a Sumitomo-Nestal injection molding machine SG75. The center part of ASTM No. 4 dumbbell test piece was cut in a direction perpendicular to the resin flow direction, and a thin piece of 0.1 μm or less was cut from the center part of the cross section at −20 ° C. to make an H-7100 type manufactured by Hitachi, Ltd. (B) The dispersion particle diameter of the polyamide resin component was measured by magnifying it to 10,000 to 20,000 times with a transmission electron microscope (resolution (particle image) 0.38 nm, magnification of 500 to 600,000 times).

[Tube tensile elongation]
The measurement was performed using a Tensilon UTA 2.5T tensile tester at a distance between chucks of 100 mm and a tensile speed of 10 mm / min. As a test piece, a tube cut to 140 mm was used.

[Interlayer adhesion strength]
The tube was cut into a strip shape, the inner layer and the outer layer at the end of the strip were peeled, each layer was sandwiched between chucks of a tensile tester, and the 180 ° peel strength (N / cm) was measured under the following conditions. Tensile speed 10 mm / min, test piece size: width 10 mm, length: 100 mm, average peeling force between 20 mm was defined as interlayer adhesion.

[Kink properties]
The tube was wound around a cylinder having a radius of Rmm, and the tube was not broken. At that time, the flat tube was evaluated with a minimum cylindrical radius R in which the minor axis of the flat tube was 50% or more. It shows that the flexibility as a tube is excellent, so that the minimum cylindrical radius R is small.

[Fuel permeability coefficient]
The sample was hot-pressed at 340 ° C. to form a film having a thickness of about 0.1 mm, and a disk-shaped test piece (diameter 6 cm) was cut out. The obtained test piece was attached to GTR-30XATK (manufactured by GTR Tech), and model gasoline (a mixture of (i) toluene and isooctane in a 50/50 volume ratio and (b) ethanol in 90 pairs) was placed in the upper cell of the test piece. (Alcohol gasoline mixture mixed at 10 volume ratio) was charged and measured at a measurement temperature of 60 ° C. according to JIS K7126 A method (differential pressure method).

[Volume resistivity]
Using a conductive resin composition pellet, a molded body having a thickness of 0.3 cm and a diameter of 100 mm was molded by injection molding under the conditions of a resin temperature of 320 ° C. and a mold temperature of 150 ° C., and this was used as a sample. For the measurement, TR6877 Computing Digital Multimeter manufactured by Takeda Riken Kogyo Co., Ltd. was used.

[Reference Example 1] (a) Polyphenylene sulfide resin (a-1)
In a 70 liter autoclave equipped with a stirrer, 8267.37 g (70.00 mol) of 47.5% sodium hydrosulfide, 2957.21 g (70.97 mol) of 96% sodium hydroxide, N-methyl-2-pyrrolidone (NMP ) 11434.50 g (115.50 mol), 1639.99 g (20.0 mol) of sodium acetate, and 10500 g of ion-exchanged water, gradually heated to 245 ° C. over about 3 hours while passing nitrogen at normal pressure, After distilling out 14780.1 g of water and 280 g of NMP, the reaction vessel was cooled to 160 ° C. The amount of water remaining in the system per mole of the charged alkali metal sulfide was 1.06 mol including the water consumed for the hydrolysis of NMP. The amount of hydrogen sulfide scattered was 0.02 mol per mol of the charged alkali metal sulfide.

  Next, 10235.46 g (69.63 mol) of p-dichlorobenzene and 900.00 g (91.00 mol) of NMP were added, the reaction vessel was sealed under nitrogen gas, and stirred at 240 rpm while stirring at 0.6 ° C. / The temperature was raised to 238 ° C. at a rate of minutes. After reacting at 238 ° C. for 95 minutes, the temperature was raised to 270 ° C. at a rate of 0.8 ° C./min. After performing the reaction at 270 ° C. for 100 minutes, 1260 g (70 mol) of water was injected over 15 minutes and cooled to 250 ° C. at a rate of 1.3 ° C./minute. Then, after cooling to 200 ° C. at a rate of 1.0 ° C./min, it was rapidly cooled to near room temperature.

  The contents were taken out, diluted with 26300 g of NMP, the solvent and solid matter were filtered off with a sieve (80 mesh), and the resulting particles were washed with 31900 g of NMP and filtered off. This was washed several times with 56000 g of ion-exchanged water and filtered, then washed with 70000 g of 0.05 wt% aqueous acetic acid and filtered. After washing with 70000 g of ion-exchanged water and filtering, the obtained water-containing polyphenylene sulfide particles were dried with hot air at 80 ° C. and dried under reduced pressure at 120 ° C. The obtained (a) polyphenylene sulfide resin had a melt viscosity of 130 Pa · s (310 ° C., shear rate 1000 / s).

[Other ingredients]
b-1: Nylon 11 (relative viscosity 2.2)
b-2: Nylon 12 (relative viscosity 2.2)
b-3: Nylon 6 (Toray Industries, Inc. “Amilan” CM1046X04)
b-4: Polybutylene terephthalate (Toray Industries, Inc. PBT 1400S)
c-1: Nylon 6/66 copolymer 50% aqueous solution of adipic acid and hexamethylenediamine salt (AH salt) and ε-caprolactam (CL) 20 parts by weight of AH salt and 80 parts by weight of CL And mixed in a 30 liter autoclave. After the temperature was raised to 270 ° C. at an internal pressure of 10 kg / cm 2, the internal temperature was kept at 245 ° C. and the pressure was gradually reduced to 0.5 kg / cm 2 while stirring to stop stirring. After returning to normal pressure with nitrogen, it was extracted as a strand, pelletized, and unreacted substances were extracted and removed using boiling water and dried. The copolymer polyamide 6/66 resin thus obtained (copolymerization ratio (weight ratio): nylon 6 component / nylon 66 component = 80/20) had a relative viscosity of 4.20 and a melting point of 193 ° C. . c-2: Toray Industries, Inc. CM2001 (nylon 610)
d-1: Olefin-based copolymer containing α-olefin and α, β-unsaturated glycidyl ester as main components. Ethylene / glycidyl methacrylate = 88/12 (% by weight) copolymer.
d-2: Maleic anhydride (0.5 wt%) graft-modified ethylene-butene copolymer e-1: Ethylene / butene-1 = 88/12 MFR = 0.5 Density 885 kg / m ³
e-2: ethylene / butene-1 = 81/19 MFR = 0.5 density 865 kg / m ³ (% by weight) copolymer f-1: N-butylbenzenesulfonamide g-1: 3-isocyanatopropyltriethoxy Silane (KBE9007 manufactured by Shin-Etsu Silicone)
g-2: γ-glycidoxypropyltrimethoxysilane (KBM403 manufactured by Shin-Etsu Silicone)
h-1: Conductive filler: Carbon black (EC600JD manufactured by Ketjen Black International Co., Ltd., DBP oil absorption 495 ml / 100 g, BET surface area 1270 m ² / g, average particle size 30 nm, ash content 0.2%

[Preparation of outer layer (A-1 to A-9) resin composition]
Each first-stage compounded material shown in Table 1 was dry blended at the ratio shown in Table 1 and premixed for 2 minutes with a tumbler, and then TEX30α type twin screw extruder (L / D = 45.5 manufactured by Nippon Steel) , Two kneading sections), set the cylinder temperature so that the die discharge resin temperature is 310 ° C. at a screw speed of 300 rpm, melt knead, pelletize with a strand cutter, and dry at 120 ° C. overnight. did. Next, after pre-mixing the pellet and the second-stage blend for 2 minutes with a tumbler, a TEX30α type twin screw extruder (L / D = 45.5, manufactured by Nippon Steel Works) set to a cylinder temperature of 300 to 320 ° C. Using two kneading parts) at a screw rotation speed of 300 rpm, setting the cylinder temperature so that the die discharge resin temperature is 310 ° C., melt kneading, pelletizing with a strand cutter, and drying at 120 ° C. overnight. .

[Preparation of inner layer (B-1 to B-7) polyphenylene sulfide resin composition]
After dry blending each component shown in Table 2 at the ratio shown in Table 2, using a TEX30α type twin screw extruder (L / D = 45.5, kneading part 3 locations) manufactured by Nippon Steel Works, the screw rotation speed At 300 rpm, the cylinder temperature was set so that the die removal resin temperature would be 320 ° C., melt kneading, pelletized with a strand cutter, and dried at 120 ° C. overnight. Some pellets were subjected to injection molding, and the dispersion diameter of the island component of each molded piece was measured.

[B-8]
Each component shown in Table 2 was dry blended at the ratio shown in Table 2, and then melt-kneaded using a 40 mmφ single screw extruder manufactured by Tanabe Plastics Machinery Co., Ltd. at a set temperature of 320 ° C. and a screw rotation speed of 80 rpm. It was melt-kneaded, pelletized with a strand cutter, and dried at 120 ° C. overnight. Some pellets were subjected to injection molding, and the dispersion diameter of the island component of each molded piece was measured.

[Examples 1 to 12, Comparative Examples 1 to 4]
Next, the resin composition pellets shown in Table 1 were used for the outer layer, the pellets shown in Table 2 were used for the inner layer, and the combinations shown in Table 3 were used: outer diameter: 8 mm, inner diameter: 6 mm, outer layer thickness: 0.8 mm, inner layer thickness: 0 A 2 mm double layer tube was molded. As a molding apparatus, two 65 mm single screw extruders are used, and the resin discharged from the two extruders is collected by an adapter and formed into a tube shape, a sizing die that cools the tube and controls its dimensions, Using a take-up machine, tubes were formed at a take-up speed of 50 cm / min, and samples for various evaluations were collected. The evaluation results are shown in Table 3.

[Example 13]
8.3 parts by weight of (d-1), 17.3 parts by weight of (d-2), 17.3 parts by weight of (e-2), 100 parts by weight of the polyphenylene sulfide resin (a-1), h-1) After dry blending 7.5 parts by weight, using a TEX30α type twin screw extruder (L / D = 45.5, 3 kneading parts) manufactured by Nippon Steel, Ltd. at a screw speed of 300 rpm Then, the cylinder temperature was set so that the resin temperature of the dicing resin was 320 ° C., and the mixture was melt-kneaded, pelletized with a strand cutter, and dried at 120 ° C. overnight. When the volume resistivity was measured, it was 6 × 10 ³ Ω · cm.

  Using the A-4 resin composition pellets in Table 1 for the outer layer, the B-4 resin composition pellets in Table 2 for the intermediate layer, and using the conductive resin pellets for the innermost layer, the outer diameter: 8 mm, the inner diameter: 6 mm A three-layer tube having an outer layer thickness of 0.75 mm, an intermediate layer thickness of 0.15 mm, and an inner layer thickness of 0.1 mm was formed. As a molding device, three 65 mm single screw extruders are used, and the resin discharged from these three extruders is collected by an adapter and formed into a tube shape. A sizing die that cools the tube and controls its dimensions. When a tube was formed at a take-up speed of 50 cm / min using a take-up machine, a three-layer tube excellent in flexibility and interlayer adhesion strength was obtained.

Claims (21)

A multilayer hollow molded article having two or more layers composed of an outer layer comprising the following (A) resin composition and an inner layer comprising the following (B) polyphenylene sulfide resin composition.
(A): (a) A resin composition containing at least 5 to 300 parts by weight of a polyamide resin and / or a saturated polyester resin with respect to 100 parts by weight of a polyphenylene sulfide resin.
(B): (a) a polyphenylene sulfide resin composition containing at least 1 to 20 parts by weight of a polyamide resin with respect to 100 parts by weight of the polyphenylene sulfide resin, wherein (a) the polyphenylene sulfide resin is a sea phase; The polyphenylene sulfide resin composition is characterized in that the polyamide resin forms an island phase, and the number average dispersed particle size of the (c) polyamide resin is less than 500 nm. (A) The resin composition contains 110 to 280 parts by weight of (b) polyamide resin and / or saturated polyester resin with respect to (a) 100 parts by weight of polyphenylene sulfide resin, and (b) polyamide The multilayer hollow molded article according to claim 1, wherein the multilayer hollow molded article is a resin composition having a resin and / or a saturated polyester resin as a sea phase. The multilayer hollow molding according to any one of claims 1 and 2, wherein the polyamide resin and / or the saturated polyester resin is a polyamide resin having 8 to 15 carbon atoms per amide group. body. 4. The multilayer hollow molded article according to claim 3, wherein the polyamide resin is polydodecanamide (nylon 12) and / or polyundecanamide (nylon 11). (A) The resin composition further comprises (d) a resin containing at least one functional group selected from an epoxy group, an acid anhydride group, a carboxyl group, and a salt thereof with respect to 100 parts by weight of the polyphenylene sulfide resin. The multilayer hollow molded article according to any one of claims 1 to 4, comprising 1 to 200 parts by weight. (D) A resin having at least one functional group selected from an epoxy group, an acid anhydride group, a carboxyl group and a salt thereof contains (d1) an epoxy group-containing olefin copolymer as an essential component. The multilayer hollow molded article according to claim 5. (D) A resin containing at least one functional group selected from an epoxy group, an acid anhydride group, a carboxyl group and a salt thereof is (d1) an epoxy group-containing olefin copolymer and (d2) an acid anhydride group. The containing olefin copolymer is contained as an essential component, and the weight ratio of (d1) and (d2) is (d1) :( d2) = 1 to 99: 99-1. Multi-layer hollow molded body. (A) The resin composition further contains (e) an elastomer that does not contain any functional group selected from an epoxy group, an acid anhydride group, a carboxyl group and a salt thereof, based on (a) 100 parts by weight of the polyphenylene sulfide resin. The multilayer hollow molded article according to any one of claims 1 to 7, which is contained in an amount of 1 to 200 parts by weight. (E) The elastomer which does not contain any functional group selected from an epoxy group, an acid anhydride group, a carboxyl group and a salt thereof contains an olefin copolymer having a density of 880 kg / m ³ or less. Item 9. The multilayer hollow molded article according to Item 8. The multilayer hollow molded body according to any one of claims 1 to 9, wherein (A) the resin composition further comprises (f) a plasticizer. The multilayer hollow molded article according to any one of claims 1 to 10, wherein the (B) polyamide resin has a number average dispersed particle size of less than 500 nm after (B) the polyphenylene sulfide resin composition is melt-retained at 300 ° C for 30 minutes. . (B) The polyphenylene sulfide resin composition is further prepared by adding (g) a compound having at least one functional group selected from an epoxy group, an amino group and an isocyanate group to 100 parts by weight of (a) the polyphenylene sulfide resin; The multilayer hollow molded article according to any one of claims 1 to 11, wherein 1 to 30 parts by weight is blended. (G) The multilayer according to claim 12, wherein the compound having at least one functional group selected from an epoxy group, an amino group and an isocyanate group is a compound containing one or more isocyanate groups or a compound containing two or more epoxy groups. Hollow molded body. The multilayer hollow molded article according to any one of claims 1 to 13, wherein (c) the polyamide resin is at least one selected from the group consisting of copolymerized polyamide, nylon 610, and nylon 612. The multilayer hollow molding according to any one of claims 1 to 14, wherein both (A) the resin composition and (B) the polyphenylene sulfide resin composition are non-conductive resin compositions having a volume resistivity of 10 ¹² Ω · cm or more. body. The multilayer hollow molded article according to any one of claims 1 to 15, wherein (a) the melt viscosity of the polyphenylene sulfide resin exceeds 80 Pa · s (under conditions of 310 ° C and a shear rate of 1000 / s). (C) Conductivity having a volume resistivity of more than 100 Ω · cm and not more than 10 ¹⁰ Ω · cm inside the outer layer made of (A) resin composition and the inner layer made of (B) polyphenylene sulfide resin composition The multilayer hollow molded article according to any one of claims 1 to 16, wherein there are three or more layers in which a layer comprising a thermoplastic resin composition is present. The multilayer according to claim 17, wherein the conductive thermoplastic resin composition (C) is a resin composition obtained by blending 1 to 70 parts by weight of a conductive filler with respect to 100 parts by weight of the thermoplastic resin. Hollow molded body. The multilayer hollow molded article according to any one of claims 17 and 18, wherein (C) the conductive thermoplastic resin composition is a resin composition comprising (a) a polyphenylene sulfide resin. The multilayer hollow molded article according to any one of claims 1 to 19, produced by a coextrusion molding method. The multilayer hollow molded body according to any one of claims 1 to 20, wherein the multilayer hollow molded body is any one selected from an automobile fuel tube, a fuel filler hose, and a tube for LLC (long life coolant).