WO2022138858A1 - エチレン-ビニルアルコール共重合体樹脂組成物の製造方法 - Google Patents
エチレン-ビニルアルコール共重合体樹脂組成物の製造方法 Download PDFInfo
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- WO2022138858A1 WO2022138858A1 PCT/JP2021/047995 JP2021047995W WO2022138858A1 WO 2022138858 A1 WO2022138858 A1 WO 2022138858A1 JP 2021047995 W JP2021047995 W JP 2021047995W WO 2022138858 A1 WO2022138858 A1 WO 2022138858A1
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- 238000007598 dipping method Methods 0.000 description 1
- POLCUAVZOMRGSN-UHFFFAOYSA-N dipropyl ether Chemical compound CCCOCCC POLCUAVZOMRGSN-UHFFFAOYSA-N 0.000 description 1
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- YCUBDDIKWLELPD-UHFFFAOYSA-N ethenyl 2,2-dimethylpropanoate Chemical compound CC(C)(C)C(=O)OC=C YCUBDDIKWLELPD-UHFFFAOYSA-N 0.000 description 1
- UIWXSTHGICQLQT-UHFFFAOYSA-N ethenyl propanoate Chemical compound CCC(=O)OC=C UIWXSTHGICQLQT-UHFFFAOYSA-N 0.000 description 1
- WOXXJEVNDJOOLV-UHFFFAOYSA-N ethenyl-tris(2-methoxyethoxy)silane Chemical compound COCCO[Si](OCCOC)(OCCOC)C=C WOXXJEVNDJOOLV-UHFFFAOYSA-N 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 229910001386 lithium phosphate Inorganic materials 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- DTGRQRFFKHYRJG-UHFFFAOYSA-N magnesium tetrahydrate Chemical compound O.O.O.O.[Mg+2] DTGRQRFFKHYRJG-UHFFFAOYSA-N 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 description 1
- 229940017219 methyl propionate Drugs 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910000403 monosodium phosphate Inorganic materials 0.000 description 1
- 235000019799 monosodium phosphate Nutrition 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- VGTPKLINSHNZRD-UHFFFAOYSA-N oxoborinic acid Chemical compound OB=O VGTPKLINSHNZRD-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- UCUUFSAXZMGPGH-UHFFFAOYSA-N penta-1,4-dien-3-one Chemical compound C=CC(=O)C=C UCUUFSAXZMGPGH-UHFFFAOYSA-N 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229940114930 potassium stearate Drugs 0.000 description 1
- ANBFRLKBEIFNQU-UHFFFAOYSA-M potassium;octadecanoate Chemical compound [K+].CCCCCCCCCCCCCCCCCC([O-])=O ANBFRLKBEIFNQU-UHFFFAOYSA-M 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- UIIIBRHUICCMAI-UHFFFAOYSA-N prop-2-ene-1-sulfonic acid Chemical compound OS(=O)(=O)CC=C UIIIBRHUICCMAI-UHFFFAOYSA-N 0.000 description 1
- RGBXDEHYFWDBKD-UHFFFAOYSA-N propan-2-yl propan-2-yloxy carbonate Chemical compound CC(C)OOC(=O)OC(C)C RGBXDEHYFWDBKD-UHFFFAOYSA-N 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 229940087562 sodium acetate trihydrate Drugs 0.000 description 1
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 description 1
- RYYKJJJTJZKILX-UHFFFAOYSA-M sodium octadecanoate Chemical compound [Na+].CCCCCCCCCCCCCCCCCC([O-])=O RYYKJJJTJZKILX-UHFFFAOYSA-M 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000010557 suspension polymerization reaction Methods 0.000 description 1
- NMOALOSNPWTWRH-UHFFFAOYSA-N tert-butyl 7,7-dimethyloctaneperoxoate Chemical compound CC(C)(C)CCCCCC(=O)OOC(C)(C)C NMOALOSNPWTWRH-UHFFFAOYSA-N 0.000 description 1
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 1
- UEUXEKPTXMALOB-UHFFFAOYSA-J tetrasodium;2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxylatomethyl)amino]acetate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UEUXEKPTXMALOB-UHFFFAOYSA-J 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- AJSTXXYNEIHPMD-UHFFFAOYSA-N triethyl borate Chemical compound CCOB(OCC)OCC AJSTXXYNEIHPMD-UHFFFAOYSA-N 0.000 description 1
- TWQULNDIKKJZPH-UHFFFAOYSA-K trilithium;phosphate Chemical compound [Li+].[Li+].[Li+].[O-]P([O-])([O-])=O TWQULNDIKKJZPH-UHFFFAOYSA-K 0.000 description 1
- WRECIMRULFAWHA-UHFFFAOYSA-N trimethyl borate Chemical compound COB(OC)OC WRECIMRULFAWHA-UHFFFAOYSA-N 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- UKRDPEFKFJNXQM-UHFFFAOYSA-N vinylsilane Chemical compound [SiH3]C=C UKRDPEFKFJNXQM-UHFFFAOYSA-N 0.000 description 1
- NLVXSWCKKBEXTG-UHFFFAOYSA-N vinylsulfonic acid Chemical compound OS(=O)(=O)C=C NLVXSWCKKBEXTG-UHFFFAOYSA-N 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Images
Classifications
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- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
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-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/08—Copolymers of ethylene
- B29K2023/086—EVOH, i.e. ethylene vinyl alcohol copolymer
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
Definitions
- the present invention relates to a method for producing an ethylene-vinyl alcohol copolymer resin composition.
- Ethylene-vinyl alcohol copolymer (hereinafter sometimes referred to as EVOH) is a polymer material having excellent oxygen blocking properties, fragrance retention properties, oil resistance, non-chargeability, mechanical strength, etc. It is widely used after being molded into a container or the like.
- EVOH Ethylene-vinyl alcohol copolymer
- an ethylene-vinyl ester copolymer obtained by copolymerizing ethylene with a vinyl ester such as vinyl acetate is saponified in an organic solvent containing an alcohol in the presence of a saponification catalyst. Is common.
- Patent Document 2 describes in order to improve quality such as thermal stability. , A method of melting and kneading an EVOH-containing pellet and a trace amount of a component in an extruder and then discharging the pellet is described.
- the method of melting and kneading EVOH-containing pellets and trace components in an extruder and then discharging them is a useful method in which the addition and dehydration of trace components can be performed in the extruder, so that the manufacturing cost can be suppressed.
- the EVOH hydrous resin composition pellets discharged by the above-mentioned conventional method may cause foaming, and when the dried EVOH resin composition containing the foamed pellets is molded, the molten resin is discharged. In some cases, the molding process became unstable and the molding process could not be performed stably.
- the present invention has been made to solve the above problems, and in a method in which an EVOH-containing pellet and a trace component are melt-kneaded in an extruder and then discharged, the EVOH-containing pellet can be dehydrated with high efficiency. It is an object of the present invention to provide a production method capable of obtaining an EVOH resin composition having less foaming and good hue.
- the above object is a method for producing an EVOH resin composition in which EVOH-containing pellets at 0 to 80 ° C. and an additive are supplied to an extruder (X) and melt-kneaded, and the additives are a carboxylic acid, a boron compound, and phosphorus. It contains at least one selected from the group consisting of an acid compound, an alkali metal salt and an alkaline earth metal salt, and the additive is added to the EVOH in the extruder (X) in the extruder (X).
- the melt temperature T 0 is 70 to 180 ° C.
- the cylinder temperature T 1 of the extruder (X) is 65 to 175 ° C.
- T 0 and T 1 satisfy the following formula (1), and 5 ⁇ T 0 -T 1 ⁇ 100 (1)
- the water content of the water-containing pellets supplied to the extruder (X) is 20 to 60% by mass
- the water content of the water-containing resin composition immediately after being discharged from the extruder (X) is 10 to 35% by mass. Is solved by providing a manufacturing method.
- the additive is an aqueous solution containing at least one selected from the group consisting of a carboxylic acid, a boron compound, a phosphoric acid compound, an alkali metal salt and an alkaline earth metal salt.
- the production method of the present invention in a method in which an EVOH-containing pellet and a trace component are melt-kneaded in an extruder and then discharged, the EVOH-containing pellet can be dehydrated with high efficiency, less foaming, and a hue is reduced. A good EVOH resin composition is obtained.
- the present invention is a method for producing an EVOH resin composition in which EVOH-containing pellets and additives at 0 to 80 ° C. are supplied to an extruder (X) and melt-kneaded, wherein the additives are carboxylic acid, boron compound, and phosphorus. It contains at least one selected from the group consisting of an acid compound, an alkali metal salt and an alkaline earth metal salt, and the additive is added to the EVOH in the extruder (X) in the extruder (X).
- the melt temperature T 0 is 70 to 180 ° C.
- the cylinder temperature T 1 of the extruder (X) is 65 to 175 ° C.
- T 0 and T 1 satisfy the following formula (1), and 5 ⁇ T 0 -T 1 ⁇ 100 (1)
- the water content of the water-containing pellets supplied to the extruder (X) is 20 to 60% by mass
- the water content of the water-containing resin composition immediately after being discharged from the extruder (X) is 10 to 35% by mass. It is a manufacturing method. According to such a production method, an EVOH resin composition which can dehydrate the EVOH-containing pellets with high efficiency, has less foaming, and has a good hue can be obtained.
- the present inventors have found that supplying the additive to the extruder (X) makes foaming more likely to occur as compared with the case where the additive is not supplied, but it is surprising. Even under such conditions, the production method of the present invention exhibits the effect of suppressing foaming while achieving high dehydration efficiency.
- the water-containing resin composition or the EVOH water-containing resin composition in the present specification means a water-containing resin composition containing an additive discharged from the extruder (X), and is referred to as an EVOH resin composition.
- a method of melt-kneading an EVOH-containing pellet and a trace component in an extruder (X) and then discharging the pellet is used, but as another method for obtaining an EVOH resin composition pellet to which a trace component is added, ( 1) A method of immersing EVOH-containing pellets in an aqueous solution containing a trace amount of components, deflating the solution, and then drying the pellet is known.
- the addition method of (1) requires a treatment bath and a treatment tower for dipping the EVOH water-containing resin pellets, and also consumes energy when drying the treated EVOH water-containing resin composition pellets. Since there are many, there is a problem that the manufacturing cost is high. Therefore, it can be said that the trace component addition method in the production method of the present invention is an efficient method as compared with other addition methods.
- the EVOH-containing pellet used in the present invention is a pellet containing EVOH and water.
- the water content of the water-containing pellets may be 20 to 60% by mass, and the EVOH content may be 40 to 80% by mass.
- the EVOH hydrous pellet may contain other components such as alcohol and alkali metal salts, as described below.
- the EVOH constituting the EVOH hydrous pellet used in the present invention (hereinafter, may be referred to as "EVOH used in the present invention” or “the EVOH”) is usually obtained by saponifying an ethylene-vinyl ester copolymer. can get.
- the ethylene content in the EVOH is preferably 20 to 60 mol%. From the viewpoint of improving the melt moldability, the ethylene content is preferably 23 mol% or more, more preferably 25 mol% or more, and further preferably 30 mol% or more. On the other hand, from the viewpoint of improving the gas barrier property, the ethylene content is preferably 55 mol% or less, more preferably 50 mol% or less.
- the EVOH is usually obtained by saponifying an ethylene-vinyl ester copolymer.
- the copolymerization of ethylene and vinyl ester may be any of solution polymerization, suspension polymerization, emulsion polymerization and bulk polymerization. Further, either a continuous type or a batch type may be used, and the polymerization conditions in the case of solution polymerization are as follows.
- an alcohol having a boiling point of 100 ° C. or lower is preferable because of the solubility of the ethylene-vinyl ester copolymer and EVOH, the ease of handling, the ability to efficiently replace alcohol with water, and the like. ..
- the boiling point is more preferably 80 ° C. or lower, and even more preferably 70 ° C. or lower.
- Examples of the alcohol having a boiling point of 100 ° C. or lower include methanol, ethanol, n-propyl alcohol, isopropyl alcohol, t-butyl alcohol and the like, but methanol is particularly preferable.
- Examples of the initiator used for the polymerization include 2,2-azobisisobutyronitrile, 2,2-azobis- (2,4-dimethylvaleronitrile), and 2,2-azobis- (4-methoxy-2). , 4-Dimethylvaleronitrile), 2,2-azobis- (2-Cyclopropylpropionitrile) and other azonitrile initiators and isobutyryl peroxides, cumylperoxyneodecanoate, diisopropylperoxycarbonate, di- Organic peroxide-based initiators such as n-propylperoxydicarbonate, t-butylperoxyneodecanoate, lauroyl peroxide, benzoyl peroxide, and t-butyl hydroperoxide can be used.
- vinyl ester examples include fatty acid vinyl esters such as vinyl acetate, vinyl propionate, and vinyl pivalate, and vinyl acetate is preferable.
- EVOH can contain 0.0002 to 0.2 mol% of vinylsilane compound as a copolymerization component.
- examples of the vinylsilane-based compound include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltri ( ⁇ -methoxy-ethoxy) silane, and ⁇ -methacryloxypropylmethoxysilane. Of these, vinyltrimethoxysilane and vinyltriethoxysilane are preferably used.
- the polymerization conditions are preferably as follows. (1) Temperature; preferably 20 to 90 ° C, more preferably 40 ° C to 80 ° C. (2) Time (average residence time in the case of continuous type); preferably 2 to 15 hours, more preferably 3 to 11 hours. (3) Polymerization rate: preferably 10 to 90%, more preferably 30 to 80% with respect to the charged vinyl ester. (4) Resin content in the solution after polymerization; preferably 5 to 85% by mass, more preferably 20 to 70% by mass.
- ⁇ -olefins such as propylene, butylene, isobutylene, pentene, hexene, ⁇ -octene, and ⁇ -dodecene; 3-acyloxy-1-propene.
- Alkenes with groups unsaturated acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, their anhydrides, salts, mono or dialkyl esters; nitriles such as acrylonitrile, methacrylonitrile; acrylamide, methacrylicamide Amids such as; olefin sulfonic acid such as ethylene sulfonic acid, allyl sulfonic acid, methallyl sulfonic acid or a salt thereof; alkyl vinyl ethers, vinyl ketone, N-vinylpyrrolidone, vinyl chloride, vinylidene chloride and the like coexist in a small amount to polymerize. It is also possible.
- unsaturated acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, their anhydrides, salts, mono or dialkyl esters
- nitriles such as acrylonitrile, me
- the content of the monomer units other than ethylene, vinyl ester and vinyl alcohol in the EVOH is preferably 20 mol% or less, preferably 10 mol% or less, 5 mol% or less, 3 mol% or less, and 1 mol% or less. , 0.1 mol% or less may be preferable.
- the EVOH may not contain the other monomer unit.
- a polymerization inhibitor is added as necessary to evaporate and remove unreacted ethylene gas, and then the unreacted vinyl ester is expelled.
- a polymerization solution in which ethylene is removed from the upper part of the column filled with Rasichling is continuously supplied at a constant rate, and an organic solvent, preferably a boiling point of 100 ° C. or less is preferable, is supplied from the lower part of the column.
- a method is adopted in which a vapor of alcohol, preferably methanol is blown in, a mixed vapor of the organic solvent and the unreacted vinyl ester is distilled off from the top of the column, and a copolymer solution from which the unreacted vinyl ester is removed is taken out from the bottom of the column. Will be done.
- the saponification method can be either continuous or batch.
- the alkali catalyst sodium hydroxide, potassium hydroxide, alkali metal alcoholate and the like are used.
- the solvent used for saponification methanol is preferable.
- the saponification conditions are as follows. (1) Concentration of ethylene-vinyl ester copolymer in solution; 10 to 50% by mass (2) Reaction temperature; 30-150 ° C (3) Amount of catalyst used; 0.005 to 0.6 equivalent (per vinyl ester component) (4) Time (average residence time in the case of continuous type); 10 minutes to 6 hours
- reaction temperature 70-150 ° C.
- Amount of catalyst used 0.005 to 0.1 equivalent (per vinyl ester component).
- the degree of saponification of the obtained EVOH varies depending on the purpose, but is preferably 80 mol% or more, more preferably 95 mol% or more, still more preferably 98 mol% or more, and particularly preferably 99 mol% or more of the vinyl ester component.
- the degree of saponification can be adjusted arbitrarily depending on the conditions.
- the saponification degree of EVOH is preferably 99.7 mol% or more, preferably 99.8 mol% or more. It is more preferably 99.9 mol% or more, and particularly preferably 99.95 mol% or more, but in order to obtain such EVOH, the saponification conditions are further set to the following. It is preferable to adjust so as to.
- a continuous method is preferable as a method for obtaining EVOH having a high saponification degree of 99.9 mol% or more.
- a method for obtaining a high degree of saponification in a continuous manner for example, a method of adding a catalyst from a plurality of places in the saponification reaction tower, a method of increasing the amount of catalyst used, and a method of increasing the amount of methanol blown from the lower part of the saponification reaction tower are used. How to do it.
- a method for obtaining EVOH having a high saponification degree of 99.9 mol% or more by a batch method for example, a method of adding a catalyst in a plurality of times, a method of increasing the amount of the catalyst used, and a method of saponification. Examples thereof include a method of increasing the amount of methanol vapor or nitrogen gas blown into the reaction vessel.
- the saponification step gives a solution or paste containing EVOH. Since EVOH after the saponification reaction contains an alkaline catalyst, by-products such as sodium acetate and potassium acetate, and other impurities, these may be removed by neutralization and washing as necessary. Here, when the EVOH after the saponification reaction is washed with ion-exchanged water or the like containing almost no metal ions, chloride ions or the like, a part of the catalyst residue such as sodium acetate and potassium acetate may remain in the EVOH. ..
- the EVOH solution or paste thus obtained usually contains 50 parts by mass or more of alcohol having a boiling point of 100 ° C. or lower with respect to 100 parts by mass of EVOH.
- the alcohol content is preferably 70 parts by mass or more, and more preferably 80 parts by mass or more.
- the alcohol content is preferably 1000 parts by mass or less, and more preferably 500 parts by mass or less. By setting the alcohol content in this range, the fluidity of the EVOH solution is ensured and efficient resin production is possible.
- the alcohol is preferably methanol.
- the method of water-containing pelleting is not particularly limited, and examples thereof include a method of cooling and solidifying an EVOH solution or paste to cut it, a method of melting and kneading the EVOH solution or paste with an extruder and then discharging and cutting.
- Specific examples of the EVOH cutting method include a method of extruding EVOH into a strand shape and then cutting it with a pelletizer, and a method of cutting EVOH discharged from a die by a hot cut method, an underwater cut method, or the like.
- Examples of the method of cooling and coagulating the EVOH solution or paste after the saponification reaction to cut it include a method of extruding an alcohol / water mixed solution of EVOH into the coagulation liquid to precipitate it in a strand shape and then cutting it. ..
- a post-treatment method for the EVOH solution after the saponification reaction the mixed vapor of the solvent and water is supplied from the lower part of the container in the columnar container, and the EVOH solution is supplied from a position above the supply position of the mixed vapor. Therefore, it is preferable to replace a part of the solvent existing in the supplied EVOH solution with water to obtain a high-concentration EVOH solution.
- the concentration of EVOH in the EVOH solution supplied to the tower container is preferably 15 to 50% by mass, more preferably 25 to 40% by mass. It is also preferable that the ratio of the supply amount of the EVOH solution to the supply amount of the mixed steam (solution supply amount / steam supply amount) is 100/400 to 100/8 in terms of mass ratio. Further, it is preferable that the content of water in the mixed steam is 20 to 70% by mass.
- the solvent used for the mixed vapor is preferably an alcohol having a boiling point of 130 ° C. or lower, and examples of such alcohols include alcohols such as methanol, ethanol, propanol and butanol. Alcohol having a boiling point of 100 ° C. or lower is more preferable, and methanol is particularly preferable because it is easily available, inexpensive, has a low boiling point, and is easy to handle.
- the coagulating liquid to be precipitated is water or a water / alcohol mixed solvent, aromatic hydrocarbons such as benzene, ketones such as acetone and methyl ethyl ketone, and ethers such as dipropyl ether.
- aromatic hydrocarbons such as benzene, ketones such as acetone and methyl ethyl ketone
- ethers such as dipropyl ether.
- organic acid esters such as methyl acetate, ethyl acetate, methyl propionate and the like are used, but water or a water / alcohol mixed solvent is preferable from the viewpoint of easy handling.
- alcohols such as methanol, ethanol and propanol are used, but industrially preferable methanol is used.
- the mass ratio of the coagulant in the coagulant to the EVOH strand is not particularly limited, but is preferably 50 or more and 10,000 or less. By setting the mass ratio in the above range, it is possible to obtain EVOH-containing pellets having a uniform dimensional distribution.
- the lower limit of the temperature at which the EVOH solution is brought into contact with the coagulating liquid is preferably ⁇ 10 ° C., more preferably 0 ° C.
- the upper limit 40 ° C. is preferable, 20 ° C. is more preferable, 15 ° C. is even more preferable, and 10 ° C. is even more preferable.
- the EVOH solution is extruded into the coagulating liquid in a strand shape by a nozzle having an arbitrary shape.
- the shape of the nozzle is not particularly limited, but a cylindrical shape is preferable. In this way, the EVOH solution is extruded from the nozzle into a strand shape.
- the number of strands does not necessarily have to be one, and any number between several to several hundred can be extruded.
- the EVOH extruded into a strand shape is sufficiently solidified and then cleaved to obtain EVOH-containing water pellets. After that, if necessary, it may be washed as described later.
- the size of the pellet can be, for example, 1 mm or more and 10 mm or less in diameter in the case of a columnar shape, 1 mm or more and 10 mm or less in length, and 1 mm or more and 10 mm or less in diameter in the case of a spherical shape.
- water vapor is supplied from the lower part of the container in a columnar container as a post-treatment method for the EVOH solution or paste after the saponification reaction.
- the solvent (alcohol) present in the supplied EVOH solution or paste is derived together with the water vapor, and the solvent (alcohol) is derived with respect to 100 parts by mass of EVOH. It is preferable to derive a hydrous EVOH containing 0 to 10 parts by mass of alcohol) and 10 to 1000 parts by mass of water from the container.
- the steam to be contacted with the EVOH solution or the paste may contain 10 parts by mass or less of the solvent (alcohol) with respect to 100 parts by mass of the steam, but in order to efficiently remove the solvent (alcohol), the steam is contained. It is preferable that the solvent (alcohol) is not contained in the water vapor.
- the EVOH solution or paste comes into direct contact with water vapor in the container, and the content of the solvent (alcohol) gradually decreases, while the EVOH is in the form of a swollen paste and gels while maintaining fluidity. It is possible to derive from the container without doing anything.
- EVOH dissolves in a methanol / water mixed solvent under normal pressure, for example, at a temperature of about 60 to 70 ° C., but does not dissolve under normal pressure when the solvent is only water.
- pressurized steam having a temperature of, for example, 100 ° C. or higher, the fluidity can be maintained even when EVOH contains substantially only water.
- the water-containing EVOH derived from the container preferably contains 0 to 10 parts by mass of the solvent (alcohol) and 10 to 1000 parts by mass of water with respect to 100 parts by mass of EVOH, and is derived from the container in a fluid state. Will be done.
- the content of the solvent (alcohol) of the water-containing EVOH derived from the container is preferably 0 to 5 parts by mass, more preferably 0 to 1 part by mass, and further preferably 0 to 0.1 part by mass. Since the content of the solvent (alcohol) is small, it is possible to prevent the solvent (alcohol) from volatilizing in the subsequent process, and it is possible to preserve the working environment and the surrounding environment.
- the water content of the water-containing EVOH derived from the container is preferably 10 parts by mass or more, more preferably 30 parts by mass or more, and further preferably 50 parts by mass or more.
- the content of water derived from the container is preferably 1000 parts by mass or less, more preferably 500 parts by mass or less, and further preferably 200 parts by mass or less.
- uniform pellets tend to be produced in the pellet manufacturing process described later.
- the hydrous EVOH derived from the container is, for example, directly cut in a molten state and the cut pellets are water-cooled, or the hydrous EVOH in a molten state is extruded into a coolant in a strand shape to be solidified and then cut. Then, EVOH water-containing pellets are produced.
- the EVOH derived from the container is pelletized, the EVOH-containing pellets are produced by supplying the water-containing EVOH to an extruder (different from the extruder (X)), cutting it directly in a molten state, and cooling it with water. Is preferable.
- the water content of the obtained water-containing EVOH can also be adjusted according to the conditions of the extruder.
- a hot-cut method or an underwater-cut method is exemplified as a suitable method.
- the nozzle diameter is preferably 2 to 5 mm ⁇ ( ⁇ is the diameter; the same applies hereinafter).
- the size of the pellets to be produced can be, for example, 1 mm or more and 10 mm or less in diameter in the case of a spherical shape (or substantially spherical shape), 1 mm or more and 10 mm or less in diameter in the case of a columnar shape, and 1 mm or more and 10 mm or less in length.
- a spherical (or substantially spherical) pellet is obtained.
- Water is used as the cooling liquid for the above water cooling, but a small amount of alcohol may be contained.
- the temperature of the coolant is preferably 0 to 50 ° C., and the temperature of the water-containing EVOH in the molten state at the time of extrusion is preferably 100 to 150 ° C. Due to this temperature difference, the hydrous EVOH can be cooled and solidified in a short time.
- the temperature of the coolant is more preferably 0 to 30 ° C. Further, the temperature of the water-containing EVOH in the molten state is more preferably 110 to 140 ° C.
- the EVOH-containing pellet thus obtained can be used as an EVOH-containing pellet to be subjected to the extruder (X). Further, the EVOH-impregnated pellet after the cleaning step described later can be used as the EVOH-impregnated pellet to be subjected to the extruder (X).
- the proportion of EVOH is preferably 90% by mass or more, more preferably 95% by mass or more, further preferably 99% by mass or more, and it is composed of only EVOH. Is particularly preferred.
- the proportion of EVOH and water in the EVOH-containing pellet is preferably 90% by mass or more, more preferably 95% by mass or more, further preferably 99% by mass or more, and the EVOH-containing pellet is particularly preferably composed of only EVOH and water. ..
- the proportion of EVOH, water and the saponification catalyst residue in the EVOH-containing pellet is preferably 90% by mass or more, more preferably 95% by mass or more, and 99% by mass or more. More preferably, the EVOH hydrous pellet comprises only EVOH, water and the saponification catalyst residue.
- the EVOH hydrous pellet obtained after the saponification reaction may contain an alkali metal salt which is a saponification catalyst residue, but if the content is large, quality problems such as coloring will occur, so that the saponification catalyst A step of washing and removing the residue may be performed.
- the cleaning method is not particularly limited, and examples thereof include a method of immersing in an aqueous solution of water or an acid such as acetic acid for cleaning, and a method of supplying an aqueous solution of water or an acid to the extruder (X) for cleaning. ..
- a batch type treatment container or a continuous treatment container can be used.
- the cleaning temperature is usually in the range of 10 to 80 ° C. From the viewpoint of improving the cleaning efficiency, it is preferable that the cleaning temperature is high, but if the temperature is too high, fusion of the water-containing pellets occurs, which is not preferable.
- the lower limit of the washing temperature is preferably 20 ° C. or higher.
- the upper limit of the cleaning temperature is preferably 70 ° C. or lower.
- the content of the alkali metal salt in the EVOH water-containing pellet after washing is preferably 5% by mass or less, more preferably 1% by mass or less, further preferably 0.1% by mass or less, and 0.05% by mass or less in terms of metal. Is even more preferable, and 0.03% by mass or less is particularly preferable.
- the obtained EVOH water content pellet may be adjusted in water content through a dehydration step or the like.
- the dehydration method is not particularly limited, and examples thereof include centrifugal dehydration.
- the method for producing an EVOH resin composition pellet of the present invention includes a step of supplying the EVOH-containing pellet obtained by the above-mentioned method or the like and an additive to an extruder (X) and melt-kneading them.
- the temperature of the EVOH water-containing pellet used in this step is 0 to 80 ° C., and the water content is 20 to 60% by mass.
- the temperature of the EVOH water-containing pellets subjected to the extruder (X) is 0 ° C. or higher, preferably 10 ° C. or higher, and more preferably 25 ° C. or higher. If the temperature of the EVOH-containing pellets subjected to the extruder (X) is less than 0 ° C., problems tend to occur in the feedability of the EVOH-containing pellets, EVOH does not completely melt, the number of foamed pellets increases, and the hue deteriorates. Tend to be.
- the temperature of the EVOH-containing pellets provided in the extruder (X) is 80 ° C. or lower, preferably 75 ° C. or lower, and more preferably 65 ° C. or lower.
- the temperature of the EVOH water-containing pellets provided to the extruder (X) exceeds 80 ° C., the water content in the supplied EVOH water-containing pellets is not stable, EVOH is not completely melted in the extruder (X), and foaming occurs. The pellets tend to increase and the hue tends to deteriorate.
- the temperature of the EVOH-containing pellets subjected to the extruder (X) can be appropriately adjusted under the conditions before being subjected to the extruder (X).
- the water content of the EVOH water-containing pellets provided in the extruder (X) needs to be 20 to 60% by mass.
- the water content is preferably 25% by mass or more, more preferably 30% by mass or more, still more preferably 35% by mass or more.
- the water content is less than 60% by mass, foaming of the EVOH resin composition is suppressed.
- the water content is preferably 55% by mass or less, more preferably 45% by mass or less.
- the water content of the EVOH water-containing pellets can be adjusted by the conditions for pelletizing the water-containing EVOH after the saponification reaction, the cleaning conditions for the EVOH water-containing pellets, the dehydration conditions for the EVOH water-containing pellets, and the like.
- the EVOH water-containing pellets provided in the extruder (X) may contain alcohol as long as the effects of the present invention are not impaired.
- the content of alcohol in the EVOH water-containing pellet is usually 10% by mass or less, preferably 5% by mass or less, more preferably 1% by mass or less, still more preferably 0.1% by mass or less.
- the additive provided to the extruder (X) contains at least one selected from the group consisting of carboxylic acid, boron compound, phosphoric acid compound, alkali metal salt and alkaline earth metal salt. By containing such an additive, an EVOH resin composition having a good hue can be obtained.
- the carboxylic acid examples include oxalic acid, succinic acid, benzoic acid, citric acid, acetic acid, propionic acid, and lactic acid. Among these, acetic acid, propionic acid or lactic acid is preferable from the viewpoints of cost and availability.
- the EVOH resin composition contains a carboxylic acid, the content thereof is preferably 1 to 500 ppm with respect to the total solid content.
- the lower limit of the carboxylic acid content is more preferably 10 ppm or more, still more preferably 50 ppm or more.
- the upper limit of the carboxylic acid content is preferably 400 ppm or less, and more preferably 300 ppm or less.
- the content of carboxylic acid in the EVOH resin composition is measured by the method described in Examples.
- the content of the carboxylic acid is 1 ppm or more, coloring during melt molding tends to be suppressed. Further, when the content of the carboxylic acid is 500 ppm or less, the thermal stability tends to be good.
- boric acids include orthoboric acid, metaboric acid, tetraboric acid and the like
- boric acid esters include triethyl borate, trimethyl borate and the like
- borate salts include the above-mentioned various boric acids. Examples thereof include acid alkali metal salts, alkaline earth metal salts, and boric acid.
- orthoboric acid hereinafter, simply referred to as boric acid is preferable.
- the content thereof is preferably 10 to 2000 ppm, more preferably 50 to 1000 ppm in terms of boron with respect to the total solid content.
- the thermal stability and moldability tend to be good.
- the content of the boron compound, phosphoric acid compound, alkali metal salt or alkaline earth metal salt in the EVOH resin composition is measured by the method described in Examples.
- the phosphoric acid compound examples include various acids such as phosphoric acid and phosphoric acid and salts thereof.
- the phosphate may be contained in any form of a primary phosphate, a secondary phosphate or a tertiary phosphate, and the cation species thereof is not particularly limited, but is an alkali metal salt. , Alkaline earth metal salt is preferable.
- the phosphoric acid compound in the form of sodium dihydrogen phosphate, potassium dihydrogen phosphate, disodium hydrogen phosphate, and dipotassium hydrogen phosphate.
- the EVOH resin composition contains a phosphoric acid compound, the content thereof is preferably 1 to 1000 ppm in terms of phosphorus element with respect to the total solid content. By adding in such a range, it is possible to suppress the coloring of the molded product and the generation of gels and lumps.
- the alkali metal salt examples include monovalent metal aliphatic carboxylates, aromatic carboxylates, phosphates, metal complexes and the like.
- sodium acetate, potassium acetate, sodium phosphate, lithium phosphate, sodium stearate, potassium stearate, sodium salt of ethylenediamine tetraacetic acid and the like can be mentioned. Of these, sodium acetate, potassium acetate and sodium phosphate are preferable.
- the EVOH resin composition contains an alkali metal salt, the content thereof is preferably 5 to 5000 ppm, more preferably 20 to 1000 ppm, still more preferably 30 to 750 ppm in terms of alkali metal element with respect to the total solid content.
- the alkali metal element is contained in an amount of 5 ppm or more, the interlayer adhesiveness and compatibility can be effectively improved, and when the alkali metal element is 5000 ppm or less, the thermal stability during melt molding is further enhanced.
- alkaline earth metal salt examples include magnesium salt, calcium salt, barium salt, beryllium salt and the like, and magnesium salt and calcium salt are particularly suitable.
- the anionic species of the alkaline earth metal salt is not particularly limited, but when the EVOH resin composition in which an acetate or a phosphate is suitable contains an alkaline earth metal salt, the content thereof is the total solid content. On the other hand, 10 to 1000 ppm is preferable, and more preferably 20 to 500 ppm in terms of alkaline earth metal element. When the content of the alkaline earth metal is 10 ppm or more, the long-running property tends to be good. Further, when it is 1000 ppm or less, coloring at the time of melting the resin tends to be suppressed.
- FIG. 1 is a diagram showing a cylinder configuration and a screw configuration of a twin-screw extruder in Examples 1 to 8 and Comparative Examples 1 to 3 and 6.
- the extruder (X) used for melt-kneading the EVOH-containing pellet and the additive a twin-screw extruder is preferable, and a twin-screw extruder in which the rotation direction of the screw is the same is more preferable.
- the screw rotation speed is preferably 320 to 1000 rpm. By setting the screw rotation speed in such a range, it becomes easy to adjust the temperature of the melt in the extruder (X).
- the screw rotation speed is more preferably 400 rpm or more, further preferably 500 rpm or more, and particularly preferably 550 rpm or more.
- the screw rotation speed is more preferably 800 rpm or less, further preferably 700 rpm or less, and particularly preferably 650 rpm or less.
- the EVOH-containing pellet is charged from the raw material supply unit 1.
- the additive is added from the trace component addition unit 3.
- the additive is added to the water-containing EVOH in the extruder (X).
- the additive can be uniformly mixed with the water-containing EVOH, so that an EVOH water-containing resin composition having a good hue can be obtained.
- each of the additives can be added individually, a plurality of the additives may be added at the same time depending on the embodiment.
- the water-containing EVOH in the extruder (X) is melted at the position where the additive is added to the extruder (X). It is preferable that the position is in such a state that the effect of the present invention is fully exhibited. In particular, it is preferable to add the additive to the water-containing EVOH in a water-containing and melted state.
- the extruder (X) preferably has a kneading portion, and in particular, the addition position of the additive is the kneading portion of the extruder (X) so that the additive can be uniformly added to the water-containing EVOH. It is preferable because it is easily mixed.
- the form of addition of the additive is not particularly limited.
- a method of dissolving the additive in a solvent and adding it as a solution is particularly preferable from the viewpoint of controlling the amount of addition and uniformly dispersing the additive in the water-containing EVOH.
- the solvent is not particularly limited, but water is preferable from the viewpoints of solubility of the additive, cost advantage, ease of handling, safety of working environment, and the like.
- the additive is an aqueous solution containing at least one selected from the group consisting of a carboxylic acid, a boron compound, a phosphoric acid compound, an alkali metal salt and an alkaline earth metal salt. Further, as an addition method, it is preferable to add the additive to the extruder (X) from one place or two or more places.
- the lower limit of the addition amount of the solution is preferably 1 part by mass or more with respect to 100 parts by mass of the dry mass of the EVOH, and it is preferably 3 parts by mass.
- the amount is more preferably 4 parts by mass or more, and further preferably 4 parts by mass or more.
- the upper limit of the amount of the solution added is preferably 50 parts by mass or less, more preferably 30 parts by mass or less, and 20 parts by mass or less with respect to 100 parts by mass of the dry mass of the EVOH. Is even more preferable.
- the amount of the solution added is 1 part by mass or more, the concentration of the solution tends to be easily adjusted, and the dispersibility of the additive in the water-containing EVOH tends to be good. Further, when the amount is 50 parts by mass or less, the water content of the obtained EVOH water-containing resin composition pellet tends to be easily controlled.
- EVOH pellets different from EVOH water-containing pellets may be simultaneously supplied to the extruder (X) as long as the effects of the present invention are not impaired.
- the EVOH pellets different from the EVOH-impregnated pellets may be dry-blended with the EVOH-impregnated pellets in advance and put into the raw material supply unit 1 of the extruder (X), or may be input to the raw material supply unit 1 of the extruder (X) without being dry-blended with the EVOH-impregnated pellets. It may be charged at the same time, or it may be charged separately from a raw material supply unit (using an extruder (X) having two raw material supply units) different from the EVOH water-containing pellets.
- the method of separately charging the EVOH-containing pellets and the EVOH pellets different from the EVOH-containing pellets from different raw material supply units is excellent in that it is quantitatively charged and that the quality variation is reduced.
- extruder (X) can be added to the extruder (X) as long as the effect of the present invention is not impaired.
- Other components include inorganic substances, plasticizers, lubricants, stabilizers, surfactants, colorants, antioxidants, UV absorbers, antistatic agents, desiccants, cross-linking agents, metal salts, fillers, various fibers, etc. Examples include the reinforcing agent of.
- Other components may be introduced into the extruder in a solid state such as powder or as a solution, but from the viewpoint of uniformly dispersing in the obtained EVOH water-containing resin composition pellets and suppressing variation in the amount of addition. Therefore, it is preferable to blend it as a solute contained in the solution or a dispersant contained in the dispersion liquid.
- an aqueous solution and an aqueous dispersion liquid are suitable, respectively.
- the other components When the other components are in a solid state such as powder, they may be dry-blended with EVOH-containing pellets in advance and charged into the raw material supply unit 1 of the extruder (X), or may be charged at the same time without dry-blending. good.
- EVOH-containing pellets in advance and charged into the raw material supply unit 1 of the extruder (X)
- X raw material supply unit 1 of the extruder
- it may be added from the trace component addition section 3 at the same time as the additive of the present invention, or it may be added by providing a new addition section.
- Other components may be added from a site different from the agent.
- the temperature T 0 of the melt containing the EVOH, the additive and water in the extruder (X) needs to be 70 to 180 ° C. If the temperature T 0 is less than 70 ° C., the fluidity of the hydrous EVOH becomes insufficient, causing gelation or clogging in the container.
- the temperature T 0 is preferably 80 ° C. or higher, more preferably 110 ° C. or higher, further preferably 125 ° C. or higher, still more preferably 140 ° C. or higher, and particularly preferably 155 ° C. or higher. That is all.
- the temperature T 0 exceeds 180 ° C., the hue of the EVOH resin composition is significantly deteriorated.
- the temperature T 0 is preferably 175 ° C. or lower, more preferably 170 ° C. or lower, and further preferably 165 ° C. or lower.
- the temperature T 0 of the melt represents the temperature detected by the temperature sensor installed in the cylinder of the extruder (X) and in contact with the melt, and the detection point is the ejection at the tip of the extruder (X). Near the exit.
- the temperature T 0 can be adjusted by adjusting the temperature of the EVOH water-containing pellets provided in the extruder (X), the cylinder temperature of the extruder (X), the screw rotation speed of the extruder (X), and the like.
- the cylinder temperature T 1 of the extruder (X) needs to be 65 to 175 ° C. If the cylinder temperature T 1 is less than 65 ° C., the fluidity of the hydrous EVOH becomes insufficient, which may cause gelation or blockage in the container.
- the temperature T 1 is preferably 70 ° C. or higher, more preferably 75 ° C. or higher, further preferably 85 ° C. or higher, still more preferably 90 ° C. or higher, and particularly preferably 95 ° C. or higher. That is all.
- the temperature T 1 is 175 ° C. or lower, an EVOH resin composition having a good hue can be obtained.
- the temperature T 1 is preferably 165 ° C.
- the cylinder temperature T 1 means the highest temperature among the cylinder temperatures at a position downstream of the portion where the raw material is supplied to the extruder (X).
- the temperature T 0 (° C.) of the melt in the extruder (X) and the cylinder temperature T 1 (° C.) of the extruder (X) need to satisfy the following formula (1). There is. 5 ⁇ T 0 -T 1 ⁇ 100 (1)
- T 0 -T 1 is preferably 15 or more, more preferably 25 or more, further preferably 35 or more, further preferably 40 or more, and particularly preferably 45 or more.
- T 0 to T 1 is 100 or less, an EVOH resin composition having a good hue can be obtained.
- T 0 -T 1 is preferably 90 or less, more preferably 85 or less, further preferably 80 or less, further preferably 75 or less, and particularly preferably 65 or less.
- the temperature T 0 to T 1 can be adjusted by changing the screw configuration, the cylinder configuration, the temperature of the EVOH pellet to be supplied, the cylinder temperature, the screw rotation speed, and the like.
- the saponification catalyst residue can be washed and removed in the extruder, and such a step can also be performed in the extruder (X).
- EVOH-containing pellets are supplied to the extruder (X)
- the cleaning liquid is injected from at least one location of the extruder (X)
- the resin is cleaned
- the cleaning liquid is injected from at least one location downstream of the injection portion. Can be discharged.
- the saponification catalyst residue contained in the EVOH-containing pellet supplied to the extruder (X) is preferably an alkali metal salt.
- the content of the alkali metal salt contained in the EVOH-containing pellets supplied to the extruder (X) may be in the range of 0.1 to 5% by mass in terms of metal. preferable.
- the alkali metal salt contained in the water-containing EVOH after washing is preferably 0.05% by mass or less in terms of metal. It is more preferably 0.04% by mass or less, and further preferably 0.03% by mass or less.
- the cleaning liquid used is not particularly limited as long as it can remove the saponification catalyst residue, but it is preferably an aqueous solution of an acid having a pKa of 3.5 or more at 25 ° C.
- an aqueous solution of an acid having a pKa of less than 3.5 at 25 ° C. is used, the coloring resistance and interlayer adhesion of EVOH may be unsatisfactory.
- the acid having a pKa of 3.5 or more a carboxylic acid is preferable, and acetic acid and propionic acid are particularly preferable from the viewpoint of cost and the like.
- the acid concentration is preferably 0.01 to 10 g / liter, and more preferably 0.1 to 2 g / liter.
- the injection amount of the cleaning liquid is preferably 0.1 to 100 liters per 1 kg of resin input mass.
- the method of injecting the cleaning liquid is not particularly limited as long as it can inject the cleaning liquid into the extruder (X), but examples thereof include a method of press-fitting using a plunger pump or the like.
- the method for discharging the cleaning liquid is not particularly limited as long as it can discharge the liquid from the extruder (X) using a discharge unit located downstream of the injection unit, but a dehydration slit or a dehydration hole is preferable. It can be mentioned as a thing.
- a plurality of injection parts or a plurality of discharge parts may be arranged. Further, it is preferable that such washing is performed upstream from the portion where the additive of the extruder (X) is supplied, from the viewpoint of including an appropriate amount of the additive in the obtained EVOH water-containing resin composition pellet.
- the method of discharging here is not particularly limited, and examples thereof include a method of discharging from a dehydration slit, a dehydration hole, or a vent port arranged in the cylinder of the extruder (X).
- a dehydration slit a wedge wire type dehydration slit and a screen mesh type dehydration slit are preferable.
- the vent port include a vacuum vent that removes water vapor under reduced pressure and an open vent that removes water vapor under normal pressure.
- dehydration slits or dehydration holes are preferred. Since these can be discharged with either water or water vapor, it is possible to efficiently remove water from a resin having a high water content, and in this respect, generally only water vapor can be discharged. Often more effective than the vent opening. Further, when the water is discharged using the vent port, the resin easily adheres to the vent port, and the adhered resin may deteriorate and be mixed in the extruder (X). Therefore, dehydration is also performed from this point. Slits or dehydration holes are preferred. Further, when a dehydration hole is used, the melt may protrude from the hole, and from this point, it is preferable to use a dehydration slit.
- the dehydration means may be used alone, a plurality of the same type may be used, or different types may be used in combination. For example, it is also possible to remove water to some extent from a resin having a high water content by using a dehydration slit, and then further remove water from the vent port on the downstream side thereof.
- the above-mentioned dehydration operation is performed to adjust the water content of EVOH in the extruder (X) and after extrusion.
- water may be supplied to the extruder (X) in addition to or without the above-mentioned dehydration operation. ..
- the method of supplying water to the extruder (X) is not particularly limited, and examples thereof include a method of press-fitting using a plunger pump or the like.
- the water content of the EVOH water-containing resin composition immediately after being discharged from the extruder (X) needs to be 10 to 35% by mass.
- the water content is preferably 32% by mass or less, more preferably 28% by mass or less, further preferably 26% by mass or less, further preferably 24% by mass or less, and particularly preferably 22% by mass or less.
- the water content may be 10% by mass or more, preferably 12% by mass or more, 14% by mass or more, 16% by mass or more, and 18% by mass or more.
- the water removal rate obtained by the following formula using the water content B (parts by mass) per 100 parts by mass of EVOH in the product is preferably 0.1 or more, more preferably 0.3 or more, still more preferably 0.4 or more. , 0.45 or more is more preferable, and 0.5 or more is particularly preferable.
- the method is not particularly limited, but the EVOH water-containing resin composition is supplied to the extruder (X) and directly cut in a molten state.
- a method of producing pellets is exemplified.
- a method for direct cutting a hot cut method or an underwater underwater cut method is exemplified as a suitable method, and a nozzle diameter of 2 to 5 mm ⁇ ( ⁇ is a diameter; the same applies hereinafter) is preferable.
- the size of the pellets to be produced is preferably 1 mm or more and 10 mm or less in diameter, for example, in the case of a spherical shape.
- the obtained EVOH hydrous resin composition pellets are usually subjected to a drying step.
- the water content of the EVOH resin composition pellets after drying is preferably 1.0% by mass or less, and more preferably 0.5% by mass or less.
- the drying method is not particularly limited, but a static drying method, a fluid drying method, or the like is mentioned as preferable, and it is also possible to adopt a multi-step drying step in which several drying methods are combined. Among these, a method of first drying by a fluid drying method and then drying by a static drying method is preferable.
- the proportion of EVOH is preferably 90% by mass or more, more preferably 95% by mass or more, further preferably 99% by mass or more, and particularly preferably composed of EVOH alone.
- the proportion of EVOH and additives in the EVOH resin composition pellets is preferably 90% by mass or more, more preferably 95% by mass or more, further preferably 99% by mass or more, and the EVOH resin composition pellets are substantially EVOH. And it is particularly preferable that it consists only of additives.
- the melt flow rate (MFR) (190 ° C., load 2160 g) of the obtained EVOH resin composition pellet is usually 0.5 to 100 g / 10 minutes, preferably 1 to 50 g / 10 minutes, and more preferably 1. 5 to 20 g / 10 minutes.
- MFR melt flow rate
- the EVOH resin composition pellets thus obtained are molded into various molded bodies such as films, sheets, containers, pipes and fibers by melt molding, and are also used for various purposes.
- This treatment solution was transferred to a 50 mL volumetric flask and measured with ion-exchanged water to prepare a sample solution for measurement.
- the contents of metal element, boron element and phosphorus element in the sample solution were measured by an ICP emission spectroscopic analyzer (“OPTIMA4300DV” manufactured by PerkinElmer Co., Ltd.). From the obtained values, the content of the metal salt in terms of metal element, the content of the boron compound in terms of boron element, and the content of the phosphoric acid compound in terms of phosphorus element in the EVOH resin composition pellets were determined.
- Example 1 EVOH water-containing pellets having a water content of 40% by mass and a temperature of 60 ° C. (ethylene content 32 mol%, saponification degree 99.99 mol%, alkali metal salt (metal equivalent) 20 ppm) were put into a twin-screw extruder.
- the cylinder configuration and screw configuration of the twin-screw extruder are shown in FIG.
- the cylinder temperature T 1 maximum temperature at a position downstream of the raw material supply unit 1) is 100 ° C.
- the screw rotation speed is 600 rpm
- the twin-screw extruder shown in FIG. 1 is composed of a raw material supply unit 1, a liquid removal unit 2, and a trace component addition unit 3, and a dehydration slit 5 is arranged in the liquid removal unit 2.
- the screw is a combination of a full flight screw 6, a reverse flight screw 7, and a seal ring 8 as shown in FIG. Further, a temperature sensor 4 is arranged at the end of the cylinder.
- the temperature T 0 of the melt in the twin-screw extruder was 160 ° C.
- the temperature T 0 was measured using a temperature sensor 4 arranged at the end of the cylinder and in contact with the melt.
- the molten EVOH hydrated resin composition discharged from the twin-screw extruder was cut with a hot cutter to obtain EVOH hydrated resin composition pellets.
- the water content of the EVOH water-containing resin composition pellet immediately after being obtained was measured according to the method described in (1) above. The results are shown in Table 1.
- the obtained EVOH water-containing resin composition pellets were dried at 90 ° C. for 15 hours using a fluidized bed dryer, and subsequently dried at 105 ° C. for 15 hours using a static dryer to have a water content of 0.2 mass.
- % EVOH resin composition pellets were obtained.
- quantification of carboxylic acid, quantification of metal salt, boron compound and phosphorus compound, evaluation of foaming and coloring, and measurement of MFR were carried out according to the methods described in (2) to (6) above. .. The results are shown in Table 1.
- Examples 2 to 7, Comparative Examples 1 to 3, 6 Ethylene unit content of EVOH, water content and temperature of EVOH water-containing pellets supplied to the extruder, screw rotation speed, cylinder temperature T 1 , temperature of melt in twin-screw extruder T 0 , and EVOH water-containing resin composition.
- EVOH resin composition pellets were prepared and evaluated in the same manner as in Example 1 except that the water content of the pellets was changed as shown in Table 1. The results are shown in Table 1.
- Example 8 An EVOH resin composition pellet was prepared by the same method as in Example 1 except that an aqueous solution containing 5.4 g / L of acetic acid and 9.6 g / L of sodium acetate / trihydrate was used as an additive. evaluated. The results are shown in Table 1.
- the input amount of the EVOH water-containing pellet per unit time was 10.7 kg / hr (including the mass of the contained water), and the input amount of the additive per unit time was 0.65 L / hr.
- the additives are acetic acid 4.3 g / L, boric acid 15 g / L, sodium acetate trihydrate 7.6 g / L, magnesium acetate tetrahydrate 3.9 g / L, and diphosphate diphosphate. It was an aqueous solution containing 2.2 g / L of potassium hydrogen.
- the specifications of the twin-screw extruder are shown below. Type Twin-screw extruder L / D 45.5 Caliber 30mm ⁇ Screw Same-direction perfect meshing type die diameter 3.0mm ⁇
- the twin-screw extruder shown in FIG. 2 is composed of a raw material supply unit 1, a liquid removal unit 2, and a trace component addition unit 3, and a dehydration slit 5 is arranged in the liquid removal unit 2.
- the screw is a combination of a full flight screw 6 and a reverse flight screw 7 as shown in FIG. Further, a temperature sensor 4 is arranged at the end of the cylinder.
- the temperature T 0 of the melt in the twin-screw extruder was 100 ° C.
- the temperature T 0 was measured using a temperature sensor 4 arranged at the end of the cylinder.
- the molten EVOH resin discharged from the twin-screw extruder was cut with a hot cutter to obtain EVOH hydrous resin composition pellets.
- the water content of the EVOH water-containing resin composition pellet immediately after being obtained was measured according to the method described in (1) above. The results are shown in Table 1.
- the obtained EVOH water-containing resin composition pellets were dried at 90 ° C. for 15 hours using a fluidized bed dryer, and subsequently dried at 105 ° C. for 15 hours using a static dryer to have a water content of 0.2 mass.
- % EVOH resin composition pellets were obtained.
- quantification of carboxylic acid, quantification of metal salt, boron compound and phosphorus compound, evaluation of foaming and coloring, and measurement of MFR were carried out according to the methods described in (2) to (6) above. The results are shown in Table 1.
- the composition of the treatment solution is an aqueous solution containing 1.7 g / L of acetic acid, 0.67 g / L of sodium acetate, 1.84 g / L of magnesium acetate tetrahydrate, and 0.77 g / L of potassium dihydrogen phosphate. Met.
- the treated pellets were continuously taken out from the bottom of the treatment device.
- the EVOH water-containing pellets having a water content of 39% by mass and a temperature of 50 ° C. thus obtained were used, the cylinder configuration and screw configuration of the twin-screw extruder were changed as shown in FIG. 3, and they were added to the twin-screw extruder.
- EVOH resin composition pellets were prepared and evaluated in the same manner as in Comparative Example 4 except that no agent was added. The results are shown in Table 1.
- Example 7 An attempt was made to prepare an EVOH resin composition pellet by the same method as in Example 1 except that the water-containing pellet supply temperature was changed to 100 ° C., but the pellets stuck to each other when they were put into a twin-screw extruder. The desired EVOH resin composition pellet was not obtained.
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Abstract
Description
5≦T0-T1≦100 (1)
前記押出機(X)に供給される前記含水ペレットの含水率が20~60質量%であり、前記押出機(X)から吐出された直後の含水樹脂組成物の含水率が10~35質量%である、製造方法を提供することによって解決される。
5≦T0-T1≦100 (1)
前記押出機(X)に供給される前記含水ペレットの含水率が20~60質量%であり、前記押出機(X)から吐出された直後の含水樹脂組成物の含水率が10~35質量%である、製造方法である。このような製造方法によれば、EVOH含水ペレットの脱水を高効率で行うことができるとともに、発泡が少なく、色相も良好であるEVOH樹脂組成物が得られる。この理由は定かではないが、押出機(X)に供給されるEVOH含水ペレットの含水率とT0-T1とを適切な範囲とすることで、押出機中でのEVOH含水ペレットの剪断・溶融の状態が特定の状態となり、吐出される含水EVOHに含まれる水がムラ無く適切に分散することで発泡が生じ難くなっているものと推察される。このような、高い脱水効率を実現しつつ発泡が抑制できるという効果は、本発明の製造条件により初めて発現するものであり、本発明者らが鋭意検討することにより初めて得られた知見である。さらに、添加剤を押出機(X)に供給することで、添加剤を供給しない場合と比べて、発泡がより起こりやすい状況となることを本発明者らは知見しているが、驚くべきことにそのような条件下においても本発明の製造方法においては、高い脱水効率を実現しつつ発泡が抑制できるという効果を発現するものである。
(1)温度;好ましくは20~90℃、より好ましくは40℃~80℃。
(2)時間(連続式の場合は平均滞留時間);好ましくは2~15時間、より好ましくは3~11時間。
(3)重合率;仕込みビニルエステルに対して、好ましくは10~90%、より好ましくは30~80%。
(4)重合後の溶液中の樹脂分;好ましくは5~85質量%、より好ましくは20~70質量%。
(1)溶液中のエチレン-ビニルエステル共重合体の濃度;10~50質量%
(2)反応温度;30~150℃
(3)触媒使用量;0.005~0.6当量(ビニルエステル成分当り)
(4)時間(連続式の場合、平均滞留時間);10分~6時間
反応温度;70~150℃。
触媒使用量;0.005~0.1当量(ビニルエステル成分当り)。
5≦T0-T1≦100 (1)
水除去率=(A-B)/A
ハロゲン水分率分析装置を用い、乾燥温度180℃、乾燥時間20分、サンプル量10gの条件で実施例及び比較例で用いたまたは得られたペレットの含水率を、加熱乾燥質量測定法により測定した。ペレットの含水率は、下記式を用いて求めた。
含水率(質量%)=(乾燥前質量―乾燥後質量)/乾燥前質量×100
実施例及び比較例で得られたEVOH樹脂組成物ペレット20gをイオン交換水100mLに投入し、95℃で6時間加熱抽出した。得られた抽出液を、フェノールフタレインを指示薬として0.01mol/Lの水酸化ナトリウム溶液にて中和滴定することによって、EVOH樹脂組成物ペレット中のカルボン酸含有量を算出した。
実施例及び比較例で得られたEVOH樹脂組成物ペレット0.5gをテフロン(登録商標)製圧力容器に入れ、ここに濃硝酸5mLを加えて室温で30分間分解させた。分解後に前記圧力容器に蓋をし、湿式分解装置(アクタック社の「MWS-2」)により150℃で10分間、次いで180℃で5分間加熱することでさらに分解を行い、その後室温まで冷却した。この処理液を50mLのメスフラスコに移しイオン交換水でメスアップして測定用試料溶液とした。ICP発光分光分析装置(パーキンエルマー社の「OPTIMA4300DV」)により前記試料溶液中の金属元素、ホウ素元素及びリン元素の含有量を測定した。得られた値から、EVOH樹脂組成物ペレット中の、金属元素換算の金属塩含有量、ホウ素元素換算のホウ素化合物の含有量及びリン元素換算のリン酸化合物の含有量を求めた。
実施例及び比較例で得られたEVOH樹脂組成物ペレットを100g採取し、当該ペレットにおける、くぼみ、発泡などの形状不良が見られるペレットの割合(質量%)を求め、以下の基準で評価した。形状不良が見られるものの割合が5質量%未満(評価がA又はB)のペレットは、実使用に耐えうる。
(評価)
A :1質量%未満
B :1質量%以上5質量%未満
C :5質量%以上
実施例及び比較例で得られたEVOH樹脂組成物ペレットを用い、下記条件にて製膜を実施し、20μmの単層フィルムを得た。製膜開始から1時間後のフィルムを紙管に巻き取り、フィルム端面の着色度を肉眼で以下の基準で評価した。評価がA又はBのペレットは実使用に耐えうる。
(製膜条件)
押出温度:供給部/圧縮部/計量部/ダイ
=170/210/210/210℃
スクリュー回転数:40rpm
引取りロール温度:80℃
(評価)
A :着色が確認されなかった
B :僅かな黄変が確認された
C :黄変が確認された
各実施例及び比較例で得られた乾燥樹脂組成物ペレットを、メルトインデクサーL244(宝工業株式会社製)の内径9.55mm、長さ162mmのシリンダーに充填し、190℃で溶融した後、溶融した樹脂組成物に対して、質量2,160g、直径9.48mmのプランジャーを使用して均等に荷重をかけた。シリンダーの中央に設けた径2.1mmのオリフィスより単位時間当たりに押出される樹脂組成物量(g/10分)を測定し、これをMFRとした。なお、実施例3に関しては、210℃で溶融してMFRを測定した。
含水率40質量%、温度60℃のEVOH含水ペレット(エチレン含有量32mol%、ケン化度99.99mol%、アルカリ金属塩(金属換算)20ppm)を二軸押出機に投入した。当該二軸押出機のシリンダー構成及びスクリュー構成を図1に示す。シリンダー温度T1(原料供給部1よりも下流側の位置における最高温度)を100℃、スクリュー回転数を600rpmとし、図1に示される、吐出側先端部の微量成分添加部3より、酢酸/ホウ酸/酢酸ナトリウム/酢酸マグネシウム/リン酸二水素カリウム水溶液からなる添加剤を添加した。EVOH含水ペレットの単位時間当たりの投入量は34.6kg/hr(含有される水の質量を含む)、添加剤の単位時間当たりの投入量は1.7L/hrであった。添加剤は、酢酸を5.4g/L、ホウ酸を19g/L、酢酸ナトリウム・3水和物を9.6g/L、酢酸マグネシウム・4水和物を3.9g/L、リン酸二水素カリウムを2.2g/L含有する水溶液であった。二軸押出機の仕様を以下に示す。
形式 二軸押出機
L/D 45.5
口径 30mmΦ
スクリュー 同方向完全噛合型
ダイス口径 3.0mmΦ
EVOHのエチレン単位含有率、押出機に供給されるEVOH含水ペレットの含水率及び温度、スクリュー回転数、シリンダー温度T1、二軸押出機中の溶融物の温度T0、及びEVOH含水樹脂組成物ペレットの含水率を表1に示されるとおりに変更した以外は、実施例1と同様の方法でEVOH樹脂組成物ペレットを作製し、評価した。結果を表1に示す。
添加剤として、酢酸を5.4g/L、酢酸ナトリウム・3水和物を9.6g/L含有する水溶液を用いた以外は実施例1と同様の方法でEVOH樹脂組成物ペレットを作製し、評価した。結果を表1に示す。
含水率39質量%、温度50℃のEVOH含水ペレット(エチレン含有量32mol%、ケン化度99.98mol%、アルカリ金属塩(金属換算)20ppm)を二軸押出機に投入した。当該二軸押出機のシリンダー構成及びスクリュー構成を図2に示す。シリンダー温度T1を100℃、スクリュー回転数を300rpmとし、図2に示される、吐出側先端部の微量成分添加部3より、酢酸/ホウ酸/酢酸ナトリウム/酢酸マグネシウム/リン酸二水素カリウム水溶液からなる添加剤を添加した。EVOH含水ペレットの単位時間当たりの投入量は10.7kg/hr(含有される水の質量を含む)、添加剤の単位時間当たりの投入量は0.65L/hrであった。添加剤は、酢酸を4.3g/L、ホウ酸を15g/L、酢酸ナトリウム・3水和物を7.6g/L、酢酸マグネシウム・4水和物を3.9g/L、リン酸二水素カリウムを2.2g/L含有する水溶液であった。二軸押出機の仕様を以下に示す。
形式 二軸押出機
L/D 45.5
口径 30mmΦ
スクリュー 同方向完全噛合型
ダイス口径 3.0mmΦ
含水率39質量%のEVOH含水ペレット(エチレン含有量32mol%、ケン化度99.95mol%)を直径0.8m、高さ4mの塔型処理器の頂部へ33kg/hrで供給した。該処理器の下部から酢酸/酢酸ナトリウム/酢酸マグネシウム/リン酸二水素カリウム水溶液からなる処理液(50℃)を500L/hrで添加した。処理液の組成は酢酸を1.7g/L、酢酸ナトリウムを0.67g/L、酢酸マグネシウム・4水和物を1.84g/L、リン酸二水素カリウムを0.77g/L含有する水溶液であった。該処理器底部からは処理されたペレットを連続的に取り出した。こうして得られた含水率39質量%、温度50℃のEVOH含水ペレットを用いたこと、二軸押出機のシリンダー構成及びスクリュー構成を図3に示されるとおりに変更したこと及び二軸押出機内に添加剤を添加しなかったこと以外は比較例4と同様の方法でEVOH樹脂組成物ペレットを作製し、評価した。結果を表1に示す。
含水ペレット供給温度を100℃に変更する以外は、実施例1と同様の方法でEVOH樹脂組成物ペレットを作製しようとしたところ、二軸押出機に投入する際にペレット同士が膠着してしまい、目的のEVOH樹脂組成物ペレットが得られなかった。
2 脱液部
3 微量成分添加部
4 温度センサー
5 脱水スリット
6 フルフライトスクリュー
7 逆フライトスクリュー
8 シールリング
Claims (2)
- 0~80℃のエチレン-ビニルアルコール共重合体含水ペレット及び添加剤を押出機(X)に供給し、溶融混練するエチレン-ビニルアルコール共重合体樹脂組成物の製造方法であって、
前記添加剤がカルボン酸、ホウ素化合物、リン酸化合物、アルカリ金属塩およびアルカリ土類金属塩からなる群から選ばれる少なくとも1種を含み、
前記押出機(X)内で前記添加剤を前記エチレン-ビニルアルコール共重合体に添加し、
前記押出機(X)中の溶融物の温度T0が70~180℃であり、前記押出機(X)のシリンダー温度T1が65~175℃であり、
T0とT1が下記式(1)を満足し、かつ
5≦T0-T1≦100 (1)
前記押出機(X)に供給される前記含水ペレットの含水率が20~60質量%であり、前記押出機(X)から吐出された直後の含水樹脂組成物の含水率が10~35質量%であることを特徴とする、製造方法。 - 前記添加剤がカルボン酸、ホウ素化合物、リン酸化合物、アルカリ金属塩およびアルカリ土類金属塩からなる群から選ばれる少なくとも1種を含む水溶液である、請求項1に記載の製造方法。
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JP2000239316A (ja) | 1999-02-25 | 2000-09-05 | Nippon Synthetic Chem Ind Co Ltd:The | エチレン−酢酸ビニル共重合体ケン化物の製造法 |
JP2001098077A (ja) * | 1999-07-23 | 2001-04-10 | Kuraray Co Ltd | エチレン−ビニルアルコール共重合体樹脂の製造方法及びペレットの製造方法 |
JP2002284811A (ja) | 2001-01-19 | 2002-10-03 | Kuraray Co Ltd | エチレン−ビニルアルコール共重合体樹脂の製造方法 |
JP2002284886A (ja) * | 2001-01-22 | 2002-10-03 | Kuraray Co Ltd | エチレン−ビニルアルコール共重合体樹脂組成物の製造方法 |
JP2010007042A (ja) * | 2007-12-28 | 2010-01-14 | Nippon Synthetic Chem Ind Co Ltd:The | エチレン−ビニルアルコール共重合体組成物、およびエチレン−ビニルアルコール共重合体ペレットの製造方法 |
JP2020090646A (ja) * | 2017-12-28 | 2020-06-11 | 株式会社クラレ | 樹脂組成物、その製造方法、成形体、及び多層構造体 |
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Patent Citations (6)
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JP2000239316A (ja) | 1999-02-25 | 2000-09-05 | Nippon Synthetic Chem Ind Co Ltd:The | エチレン−酢酸ビニル共重合体ケン化物の製造法 |
JP2001098077A (ja) * | 1999-07-23 | 2001-04-10 | Kuraray Co Ltd | エチレン−ビニルアルコール共重合体樹脂の製造方法及びペレットの製造方法 |
JP2002284811A (ja) | 2001-01-19 | 2002-10-03 | Kuraray Co Ltd | エチレン−ビニルアルコール共重合体樹脂の製造方法 |
JP2002284886A (ja) * | 2001-01-22 | 2002-10-03 | Kuraray Co Ltd | エチレン−ビニルアルコール共重合体樹脂組成物の製造方法 |
JP2010007042A (ja) * | 2007-12-28 | 2010-01-14 | Nippon Synthetic Chem Ind Co Ltd:The | エチレン−ビニルアルコール共重合体組成物、およびエチレン−ビニルアルコール共重合体ペレットの製造方法 |
JP2020090646A (ja) * | 2017-12-28 | 2020-06-11 | 株式会社クラレ | 樹脂組成物、その製造方法、成形体、及び多層構造体 |
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TW202241679A (zh) | 2022-11-01 |
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