WO2022270505A1 - ポリエステル樹脂組成物の製造方法及び回収されたポリエステル樹脂の再生方法並びにポリエステル樹脂組成物 - Google Patents
ポリエステル樹脂組成物の製造方法及び回収されたポリエステル樹脂の再生方法並びにポリエステル樹脂組成物 Download PDFInfo
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- WO2022270505A1 WO2022270505A1 PCT/JP2022/024734 JP2022024734W WO2022270505A1 WO 2022270505 A1 WO2022270505 A1 WO 2022270505A1 JP 2022024734 W JP2022024734 W JP 2022024734W WO 2022270505 A1 WO2022270505 A1 WO 2022270505A1
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- Prior art keywords
- polyester resin
- aluminum
- phosphorus
- resin composition
- compound
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- 229920001225 polyester resin Polymers 0.000 title claims abstract description 508
- 239000004645 polyester resin Substances 0.000 title claims abstract description 508
- 239000000203 mixture Substances 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 68
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 55
- 230000001172 regenerating effect Effects 0.000 title claims 2
- -1 aluminum compound Chemical class 0.000 claims abstract description 176
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 153
- 239000011574 phosphorus Substances 0.000 claims abstract description 153
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 88
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 85
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 67
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims abstract description 49
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 41
- 229910052732 germanium Inorganic materials 0.000 claims abstract description 40
- 238000002156 mixing Methods 0.000 claims abstract description 29
- 229910052787 antimony Inorganic materials 0.000 claims abstract description 23
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims abstract description 23
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- 239000010936 titanium Substances 0.000 claims abstract description 20
- 229920000728 polyester Polymers 0.000 claims description 24
- 238000004064 recycling Methods 0.000 claims description 24
- 238000000465 moulding Methods 0.000 claims description 23
- FAWGZAFXDJGWBB-UHFFFAOYSA-N antimony(3+) Chemical compound [Sb+3] FAWGZAFXDJGWBB-UHFFFAOYSA-N 0.000 claims description 21
- ZEBMSMUPGIOANU-UHFFFAOYSA-N (3,5-ditert-butyl-4-hydroxyphenyl)methylphosphonic acid Chemical compound CC(C)(C)C1=CC(CP(O)(O)=O)=CC(C(C)(C)C)=C1O ZEBMSMUPGIOANU-UHFFFAOYSA-N 0.000 claims description 16
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- 150000003609 titanium compounds Chemical class 0.000 abstract description 8
- 230000009467 reduction Effects 0.000 abstract description 5
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- 239000003054 catalyst Substances 0.000 description 44
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- QPFMBZIOSGYJDE-UHFFFAOYSA-N 1,1,2,2-tetrachloroethane Chemical compound ClC(Cl)C(Cl)Cl QPFMBZIOSGYJDE-UHFFFAOYSA-N 0.000 description 4
- UHOVQNZJYSORNB-MZWXYZOWSA-N benzene-d6 Chemical compound [2H]C1=C([2H])C([2H])=C([2H])C([2H])=C1[2H] UHOVQNZJYSORNB-MZWXYZOWSA-N 0.000 description 4
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- UHPJWJRERDJHOJ-UHFFFAOYSA-N ethene;naphthalene-1-carboxylic acid Chemical compound C=C.C1=CC=C2C(C(=O)O)=CC=CC2=C1 UHPJWJRERDJHOJ-UHFFFAOYSA-N 0.000 description 1
- 238000010101 extrusion blow moulding Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 125000003827 glycol group Chemical group 0.000 description 1
- 229960004275 glycolic acid Drugs 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- TZMQHOJDDMFGQX-UHFFFAOYSA-N hexane-1,1,1-triol Chemical compound CCCCCC(O)(O)O TZMQHOJDDMFGQX-UHFFFAOYSA-N 0.000 description 1
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 description 1
- 238000004128 high performance liquid chromatography Methods 0.000 description 1
- 239000012493 hydrazine sulfate Substances 0.000 description 1
- 229910000377 hydrazine sulfate Inorganic materials 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000012770 industrial material Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- JJTUDXZGHPGLLC-UHFFFAOYSA-N lactide Chemical compound CC1OC(=O)C(C)OC1=O JJTUDXZGHPGLLC-UHFFFAOYSA-N 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
- 239000001630 malic acid Substances 0.000 description 1
- 235000011090 malic acid Nutrition 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
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- FZZQNEVOYIYFPF-UHFFFAOYSA-N naphthalene-1,6-diol Chemical compound OC1=CC=CC2=CC(O)=CC=C21 FZZQNEVOYIYFPF-UHFFFAOYSA-N 0.000 description 1
- ZZVDMPWRAMVMSU-UHFFFAOYSA-N naphthalene-1-carboxylic acid prop-1-ene Chemical compound C1(=CC=CC2=CC=CC=C12)C(=O)O.C=CC ZZVDMPWRAMVMSU-UHFFFAOYSA-N 0.000 description 1
- 125000001624 naphthyl group Chemical group 0.000 description 1
- 125000001971 neopentyl group Chemical group [H]C([*])([H])C(C([H])([H])[H])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- BNJOQKFENDDGSC-UHFFFAOYSA-N octadecanedioic acid Chemical compound OC(=O)CCCCCCCCCCCCCCCCC(O)=O BNJOQKFENDDGSC-UHFFFAOYSA-N 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- WLJNZVDCPSBLRP-UHFFFAOYSA-N pamoic acid Chemical compound C1=CC=C2C(CC=3C4=CC=CC=C4C=C(C=3O)C(=O)O)=C(O)C(C(O)=O)=CC2=C1 WLJNZVDCPSBLRP-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- ACVYVLVWPXVTIT-UHFFFAOYSA-N phosphinic acid Chemical compound O[PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-N 0.000 description 1
- 150000003009 phosphonic acids Chemical class 0.000 description 1
- 125000004437 phosphorous atom Chemical group 0.000 description 1
- 229910000073 phosphorus hydride Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229960000380 propiolactone Drugs 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 150000003457 sulfones Chemical class 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
- HQHCYKULIHKCEB-UHFFFAOYSA-N tetradecanedioic acid Chemical compound OC(=O)CCCCCCCCCCCCC(O)=O HQHCYKULIHKCEB-UHFFFAOYSA-N 0.000 description 1
- MYWQGROTKMBNKN-UHFFFAOYSA-N tributoxyalumane Chemical compound [Al+3].CCCC[O-].CCCC[O-].CCCC[O-] MYWQGROTKMBNKN-UHFFFAOYSA-N 0.000 description 1
- VOITXYVAKOUIBA-UHFFFAOYSA-N triethylaluminium Chemical compound CC[Al](CC)CC VOITXYVAKOUIBA-UHFFFAOYSA-N 0.000 description 1
- UAEJRRZPRZCUBE-UHFFFAOYSA-N trimethoxyalumane Chemical compound [Al+3].[O-]C.[O-]C.[O-]C UAEJRRZPRZCUBE-UHFFFAOYSA-N 0.000 description 1
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 1
- QXJQHYBHAIHNGG-UHFFFAOYSA-N trimethylolethane Chemical compound OCC(C)(CO)CO QXJQHYBHAIHNGG-UHFFFAOYSA-N 0.000 description 1
- OBROYCQXICMORW-UHFFFAOYSA-N tripropoxyalumane Chemical compound [Al+3].CCC[O-].CCC[O-].CCC[O-] OBROYCQXICMORW-UHFFFAOYSA-N 0.000 description 1
- VXYADVIJALMOEQ-UHFFFAOYSA-K tris(lactato)aluminium Chemical compound CC(O)C(=O)O[Al](OC(=O)C(C)O)OC(=O)C(C)O VXYADVIJALMOEQ-UHFFFAOYSA-K 0.000 description 1
- 238000000870 ultraviolet spectroscopy Methods 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
- 235000015041 whisky Nutrition 0.000 description 1
- 235000014101 wine Nutrition 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/78—Preparation processes
- C08G63/82—Preparation processes characterised by the catalyst used
- C08G63/84—Boron, aluminium, gallium, indium, thallium, rare-earth metals, or compounds thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/20—Recycled plastic
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Definitions
- the present invention relates to a method for producing a polyester resin composition, a method for recycling a recovered polyester resin, and a polyester resin composition.
- Polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) are excellent in transparency, mechanical properties, and chemical properties. It is widely used in various fields such as fibers for industrial use and industrial materials, various films and sheets for packaging and industrial use, and hollow moldings such as bottles and engineering plastics.
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- hollow moldings made using polyester resin have become essential to our lives.
- an increase in the amount of use of hollow molded bodies is causing various problems such as depletion of resources, an increase in marine litter, and global warming.
- hollow moldings such as used polyester bottles are collected and remolded into moldings such as polyester bottles, fibers, nonwoven fabrics, etc. for reuse. Attention is paid to the recycling system.
- polyester resins using antimony compounds, titanium compounds, or germanium compounds which are widely used as polymerization catalysts, when the used polyester resin is recovered and recycled, the deterioration of the polyester resin causes coloration of the polyester resin and a decrease in molecular weight. Therefore, its improvement is desired.
- Patent Documents 1 and 2 reference As a method for solving the above problems, a method of adding a hindered phenol compound in the production of a polyester resin using an antimony compound, a titanium compound, or a germanium compound as a polymerization catalyst is known (for example, Patent Documents 1 and 2 reference).
- Patent Documents 1 and 2 improve thermal oxidation stability, further improvement is required from the viewpoint of suppressing deterioration of physical properties when recycling is performed.
- the applicant found a catalyst with excellent thermal stability. Specifically, the inventors found a catalyst comprising an aluminum compound and a phosphorus compound containing a hindered phenol structure described in Patent Documents 3 and 4. However, no study has been made to recycle the used polyester resin, especially the used polyester resin using at least one selected from antimony compounds, titanium compounds, and germanium compounds as a polymerization catalyst. In addition, in the method using a catalyst comprising an aluminum compound and a phosphorus compound, the amount of catalyst added is large and the cost of the phosphorus compound used is high, so the cost of the catalyst required for polymerization is high. In order to obtain a high-quality polyester resin while maintaining high polymerization activity, it is necessary to increase the amounts of the aluminum compound and the phosphorus compound that are catalysts, and as a result, there is a problem that the cost of the catalyst increases.
- the present invention has been made to solve the problems of the prior art, and its object is to use a used polyester resin with at least one selected from antimony compounds, titanium compounds, and germanium compounds as a polymerization catalyst. , a method for producing a polyester resin composition that is unlikely to cause coloration or a decrease in molecular weight even after multiple recyclings (hereinafter referred to as "excellent in recyclability"), a method for recycling the recovered polyester resin, and a polyester resin It is to provide a composition.
- Another object of the present invention is to provide a method for producing a polyester resin composition, a method for recycling recovered polyester resin, and a polyester resin composition at reduced costs.
- the present invention consists of the following configurations. 1. A step of mixing the recovered polyester resin (A) with a polyester resin (B) containing an aluminum compound and a phosphorus compound, wherein the polyester resin (A) satisfies the following (1) to (3), and the polyester A method for producing a polyester resin composition (C), wherein the resin (B) satisfies the following (4) to (6).
- the polyester resin (A) contains at least one element selected from antimony, titanium, and germanium (2)
- the total content of the antimony element, the titanium element, and the germanium element in the polyester resin (A) is 2 to 500 mass ppm (3)
- the polyester resin (A) has an intrinsic viscosity of 0.5 to 0.8 dl/g (4)
- the content of aluminum element in the polyester resin (B) is 9 to 20 mass ppm (5)
- the content of phosphorus element in the polyester resin (B) is 13 to 31 mass ppm (6)
- the residual molar ratio of the phosphorus element to the aluminum element in the polyester resin (B) is 1.32 or more and 1.80 or less. 1.
- polyester resin (B) has an intrinsic viscosity of 0.56 dl/g or more;
- the polyester resin (A) is 5 to 95 parts by mass with respect to a total of 100 parts by mass of the polyester resin (A) and the polyester resin (B). ⁇ 3.
- a method for producing a hollow molded article (D), comprising the step of melt-molding the polyester resin composition (C) produced by the production method according to any one of the above. 6.
- the polyester resin (A) contains at least one element selected from antimony, titanium, and germanium (2)
- the total content of the antimony element, the titanium element, and the germanium element in the polyester resin (A) is 2 to 500 mass ppm (3)
- the polyester resin (A) has an intrinsic viscosity of 0.5 to 0.8 dl/g (4)
- the content of aluminum element in the polyester resin (B) is 9 to 20 mass ppm (5)
- the content of phosphorus element in the polyester resin (B) is 13 to 31 mass ppm (6)
- the residual molar ratio of the phosphorus element to the aluminum element in the polyester resin (B) is 1.32 or more and 1.80 or less. 6.
- polyester resin (B) has an intrinsic viscosity of 0.56 dl/g or more; 3. A method for recycling the polyester resin (A) described in . 8. 6. above, wherein the phosphorus compound is 3,5-di-tert-butyl-4-hydroxybenzylphosphonic acid dialkyl ester; or 7. 3. A method for recycling the polyester resin (A) described in . 9. 6. The polyester resin (A) is 5 to 95 parts by mass with respect to a total of 100 parts by mass of the polyester resin (A) and the polyester resin (B). ⁇ 8. A method for recycling the polyester resin (A) according to any one of the above. 10.
- a polyester resin composition (C) which is a mixture of the recovered polyester resin (A) and a polyester resin (B) containing an aluminum compound and a phosphorus compound, wherein the polyester resin (A) is the following (1) to ( A polyester resin composition (C) which satisfies 3) and wherein the polyester resin (B) satisfies the following (4) to (6).
- the polyester resin (A) contains at least one element selected from antimony, titanium, and germanium (2)
- the total content of the antimony element, the titanium element, and the germanium element in the polyester resin (A) is 2 to 500 mass ppm (3)
- the polyester resin (A) has an intrinsic viscosity of 0.5 to 0.8 dl/g (4)
- the content of aluminum element in the polyester resin (B) is 9 to 20 mass ppm (5)
- the content of phosphorus element in the polyester resin (B) is 13 to 31 mass ppm (6)
- the residual molar ratio of the phosphorus element to the aluminum element in the polyester resin (B) is 1.32 or more and 1.80 or less.11. 10.
- the polyester resin (B) has an intrinsic viscosity of 0.56 dl/g or more.
- the polyester resin composition (C) according to . 12. 10.
- the phosphorus compound is 3,5-di-tert-butyl-4-hydroxybenzylphosphonic acid dialkyl ester. or 11.
- the polyester resin (A) is 5 to 95 parts by mass with respect to a total of 100 parts by mass of the polyester resin (A) and the polyester resin (B). ⁇ 12.
- a polyester resin composition (C) is prepared by mixing a polyester resin (B) containing predetermined amounts of an aluminum compound and a phosphorus compound with a recovered polyester resin (A) containing at least one element selected from antimony, titanium, and germanium.
- a polyester resin composition (C) is prepared by mixing a polyester resin (B) containing predetermined amounts of an aluminum compound and a phosphorus compound with a recovered polyester resin (A) containing at least one element selected from antimony, titanium, and germanium.
- a polyester resin composition (hereinafter sometimes referred to as a polyester resin composition (C)) is prepared by mixing the recovered polyester resin (A) with a polyester resin (B) containing an aluminum compound and a phosphorus compound. to manufacture.
- the polyester resin (A) can be regenerated by mixing the recovered polyester resin (A) with the polyester resin (B) containing the aluminum compound and the phosphorus compound.
- a polyester resin composition a mixture of a recovered polyester resin and a non-recovered polyester resin is referred to as a polyester resin composition.
- polyester resin (A) The polyester resin (A) preferably contains ethylene terephthalate structural units in an amount of 50 mol% or more, more preferably 70 mol% or more, even more preferably 80 mol% or more, and 90 mol% or more. is particularly preferred.
- the polyhydric carboxylic acid component other than terephthalic acid and the polyhydric alcohol component other than ethylene glycol the components described in the later-described polyester resin (B) can be used.
- the polyester resin (A) contains at least one element selected from antimony, titanium, and germanium. Manufactured using a catalytic amount of catalyst.
- the total content of the antimony element, the titanium element, and the germanium element in the polyester resin (A) is 2 to 500 mass ppm, preferably 5 to 400 mass ppm, and 10 to 300 mass ppm. More preferably, it is 50 to 250 ppm by mass. If it exceeds 500 ppm by mass, the intrinsic viscosity retention of the polyester resin composition (C), which will be described later, may become insufficient.
- mass ppm means 10 ⁇ 4 mass %.
- the polyester resin (A) is a recovered used polyester resin, and the shape of the polyester resin (A) is not limited, but it is preferably in a shape that is easy to mix with the polyester resin (B). , chips, flakes, powders, and the like.
- the polyester resin (A) has an intrinsic viscosity of 0.5 to 0.8 dl/g or more, preferably 0.7 to 0.8 dl/g. If the intrinsic viscosity of the polyester resin (A) is less than the above, the mechanical strength and impact resistance of the polyester resin composition (C) produced using the polyester resin (A) may be insufficient. If the intrinsic viscosity of the polyester resin (A) exceeds the above range, molding may become difficult.
- the intrinsic viscosity retention rate of the polyester resin (A) is preferably 92% or less, more preferably 91% or less, even more preferably 90% or less, and particularly preferably 89% or less.
- the intrinsic viscosity retention rate of the polyester resin (A) exceeds 92%, there is a possibility that the effect of improving recyclability by blending the polyester resin (B) may be insufficient. A method for measuring the intrinsic viscosity retention rate will be described later.
- the polyester resin (A) is preferably only a polyester resin produced using at least one polymerization catalyst selected from antimony compounds, titanium compounds, and germanium compounds. It may contain a polyester resin produced using the same, but preferably in a small amount.
- the polyester resin produced using at least one polymerization catalyst selected from antimony compounds, titanium compounds, and germanium compounds in the polyester resin (A) preferably exceeds 50% by mass, and is 70% by mass or more. is more preferable, and 80% by mass or more is even more preferable.
- polyester resin (B) contains an aluminum compound and a phosphorus compound, that is, the polyester resin (B) is produced using a catalytic amount of a polymerization catalyst comprising an aluminum compound and a phosphorus compound.
- the polyester resin (B) is a recycled polyester resin that can be mixed with the recovered polyester resin (A) to recycle the polyester resin (A).
- the polyester resin (B) is a polymer formed from at least one selected from polyhydric carboxylic acids and ester-forming derivatives thereof and at least one selected from polyhydric alcohols and ester-forming derivatives thereof.
- the main polyvalent carboxylic acid component constituting the polyester resin (B) is a dicarboxylic acid.
- the main polycarboxylic acid component is a dicarboxylic acid means that the dicarboxylic acid is contained in an amount of more than 50 mol% with respect to the total polycarboxylic acid component, and the dicarboxylic acid may be contained in an amount of 70 mol% or more. More preferably, it contains 80 mol % or more of dicarboxylic acid, and more preferably 90 mol % or more of dicarboxylic acid. In addition, when using two or more kinds of dicarboxylic acids, it is preferable that the total thereof is within the above range.
- Dicarboxylic acids include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, decanedicarboxylic acid, dodecanedicarboxylic acid, tetradecanedicarboxylic acid, hexadecanedicarboxylic acid, 1, 3-cyclobutanedicarboxylic acid, 1,3-cyclopentanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, 2,5-norbornanedicarboxylic acid, dimer acid, etc.
- saturated aliphatic dicarboxylic acids exemplified in or ester-forming derivatives thereof; unsaturated aliphatic dicarboxylic acids exemplified by fumaric acid, maleic acid, itaconic acid, or ester-forming derivatives thereof; terephthalic acid, 5-(alkali metal)sulfoisophthalic acid, diphenylic acid, 1,3-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 2, 7-naphthalenedicarboxylic acid, 4,4'-biphenyldicarboxylic acid, 4,4'-biphenylsulfonedicarboxylic acid, 4,4'-biphenyletherdicarboxylic acid, 1,2-bis(phenoxy)ethane-p,p'- aromatic dicarboxylic acids such as dicarboxylic acid, pa
- the main polycarboxylic acid component is terephthalic acid or its ester-forming derivative or naphthalenedicarboxylic acid or its forming derivative.
- Naphthalenedicarboxylic acids or ester-forming derivatives thereof include 1,3-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, and 2,7-naphthalenedicarboxylic acid. acids, or ester-forming derivatives thereof.
- the main polyvalent carboxylic acid component is terephthalic acid or an ester-forming derivative thereof or naphthalene dicarboxylic acid or an ester-forming derivative thereof
- the total content of naphthalene dicarboxylic acid or ester-forming derivative thereof is more than 50 mol%, preferably 70 mol% or more, more preferably 80 mol% or more, and 90 mol% or more. Containing is more preferable.
- terephthalic acid 2,6-naphthalenedicarboxylic acid, and ester-forming derivatives thereof. If necessary, other dicarboxylic acids may be used as constituents.
- a polycarboxylic acid other than these dicarboxylic acids a polycarboxylic acid having a valence of 3 or more and a hydroxycarboxylic acid may be used in combination as long as the amount is small, and a polycarboxylic acid having a valence of 3 to 4 is preferable.
- polyvalent carboxylic acids include ethanetricarboxylic acid, propanetricarboxylic acid, butanetetracarboxylic acid, pyromellitic acid, trimellitic acid, trimesic acid, 3,4,3′,4′-biphenyltetracarboxylic acid, and these and ester-forming derivatives.
- the polycarboxylic acid having a valence of 3 or more is preferably 20 mol % or less, more preferably 10 mol % or less, and still more preferably 5 mol % or less based on the total polycarboxylic acid component.
- the total thereof is within the above range.
- Hydroxycarboxylic acids include lactic acid, citric acid, malic acid, tartaric acid, hydroxyacetic acid, 3-hydroxybutyric acid, p-hydroxybenzoic acid, p-(2-hydroxyethoxy)benzoic acid, 4-hydroxycyclohexanecarboxylic acid, or these and ester-forming derivatives of
- the hydroxycarboxylic acid content is preferably 20 mol % or less, more preferably 10 mol % or less, still more preferably 5 mol % or less, relative to the total polycarboxylic acid component. When two or more hydroxycarboxylic acids are used, the total is preferably within the above range.
- ester-forming derivatives of polyvalent carboxylic acids or hydroxycarboxylic acids include their alkyl esters, acid chlorides, acid anhydrides, and the like.
- the main polyhydric alcohol component constituting the polyester resin (B) is glycol.
- the main polyhydric alcohol component is glycol means that the glycol content is more than 50 mol%, preferably 70 mol% or more, more preferably 80 mol% or more, relative to the total polyhydric alcohol component. It is more preferable to contain 90 mol % or more. In addition, when using two or more kinds of glycols, it is preferable that the total thereof is within the above range.
- Glycols include ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, diethylene glycol, triethylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, 2,3-butylene glycol, 1,3-butylene glycol, 4-butylene glycol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol, 1,2-cyclohexanediol, 1,3-cyclohexanediol, 1,4-cyclohexanediol, 1,2-cyclohexanediol alkylene glycols exemplified by methanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, 1,4-cyclohexanediethanol, 1,10-decamethylene glycol, 1,12-dodecanediol; polyethylene glycol; Aliphatic glycols
- alkylene glycol is preferred, and ethylene glycol, 1,3-propylene glycol, 1,4-butylene glycol, or 1,4-cyclohexanedimethanol are more preferred.
- the alkylene glycol may contain a substituent or an alicyclic structure in the molecular chain, and two or more of them may be used at the same time.
- trihydric or higher polyhydric alcohols may be used in combination as long as they are in small amounts, and trihydric to tetrahydric polyhydric alcohols are preferred.
- Trimethylolmethane, trimethylolethane, trimethylolpropane, pentaerythritol, glycerol, hexanetriol and the like are examples of trihydric or higher polyhydric alcohols.
- the trihydric or higher polyhydric alcohol is preferably 20 mol% or less, more preferably 10 mol% or less, still more preferably 5 mol% or less, relative to the total polyhydric alcohol component.
- the total is preferably within the above range.
- Cyclic esters include ⁇ -caprolactone, ⁇ -propiolactone, ⁇ -methyl- ⁇ -propiolactone, ⁇ -valerolactone, glycolide, lactide and the like.
- ester-forming derivatives of polyhydric alcohols include esters of polyhydric alcohols with lower aliphatic carboxylic acids such as acetic acid.
- the cyclic ester content is preferably 20 mol% or less, more preferably 10 mol% or less, and still more preferably 5 mol% or less, based on the total of all polyhydric carboxylic acid components and all polyhydric alcohol components.
- the polyester resin (B) is a polymer consisting of only one monomer selected from ethylene terephthalate, butylene terephthalate, propylene terephthalate, 1,4-cyclohexanedimethylene terephthalate, ethylene naphthalate, butylene naphthalate, or propylene naphthalate. It is preferably a coalescence or a copolymer composed of two or more of the above monomers, and the polyester resin (B) is polyethylene terephthalate or a copolymer composed of ethylene terephthalate and at least one of the above monomers other than ethylene terephthalate. is more preferred, and polyethylene terephthalate is particularly preferred.
- a copolymer composed of ethylene terephthalate and at least one of the above monomers other than ethylene terephthalate preferably contains 70 mol% or more, more preferably 80 mol% or more, and 90 mol of components derived from ethylene terephthalate monomers. % or more is more preferable.
- the polyester resin (B) is produced using a polymerization catalyst comprising an aluminum compound and a phosphorus compound.
- the aluminum compound that constitutes the polymerization catalyst of the polyester resin (B) is not limited as long as it dissolves in a solvent, and known aluminum compounds can be used without limitation.
- Aluminum compounds such as aluminum formate, aluminum acetate, basic aluminum acetate, aluminum propionate, aluminum oxalate, aluminum acrylate, aluminum laurate, aluminum stearate, aluminum benzoate, aluminum trichloroacetate, aluminum lactate, citric acid Carboxylate such as aluminum, aluminum tartrate, aluminum salicylate; inorganic acid salts such as aluminum chloride, aluminum hydroxide, aluminum hydroxychloride, aluminum nitrate, aluminum sulfate, aluminum carbonate, aluminum phosphate, aluminum phosphonate; aluminum methoxide , aluminum ethoxide, aluminum n-propoxide, aluminum isopropoxide, aluminum n-butoxide, aluminum t-butoxide, etc.
- At least one selected from carboxylates, inorganic acid salts, and chelate compounds is preferred, and among these, aluminum acetate, basic aluminum acetate, aluminum chloride, aluminum hydroxide, aluminum hydroxide chloride, and aluminum acetylacetate more preferably at least one selected from aluminum acetate, basic aluminum acetate, aluminum chloride, aluminum hydroxide, aluminum hydroxide chloride, and aluminum acetylacetonate, aluminum acetate and a base At least one selected from the group consisting of aluminum acetates is particularly preferred, and basic aluminum acetate is most preferred.
- the above aluminum compound is preferably an aluminum compound that is solubilized in a solvent such as water or glycol.
- Solvents that can be used in the production of the polyester resin (B) are water and alkylene glycols.
- Alkylene glycols include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, trimethylene glycol, ditrimethylene glycol, tetramethylene glycol, ditetramethylene glycol, neopentyl glycol, and the like.
- it is at least one selected from water, ethylene glycol, trimethylene glycol, and tetramethylene glycol, and more preferably water or ethylene glycol.
- the aluminum element content in the polyester resin (B) is 9 to 20 mass ppm, preferably 9 to 19 mass ppm, more preferably 10 to 17 mass ppm, still more preferably 12 to 17 mass ppm. If the aluminum element content is less than 9 ppm by mass, the polymerization activity may not be sufficiently exhibited. On the other hand, if it exceeds 20 mass ppm, the amount of aluminum-based contaminants may increase due to the relationship with the content of phosphorus element, which will be described later, and in addition, the cost of the catalyst increases.
- the phosphorus compound constituting the polymerization catalyst of the polyester resin (B) is not particularly limited, but phosphonic acid-based compounds and phosphinic acid-based compounds are preferably used because they have a large effect of improving catalytic activity. It is more preferable to use a compound because the effect of improving the catalytic activity is particularly large.
- a phosphorus compound having a phosphorus element and a phenol structure in the same molecule is preferable.
- a phosphorus compound having a phosphorus element and a phenol structure in the same molecule but a phosphonic acid compound having a phosphorus element and a phenol structure in the same molecule, and a phosphine having a phosphorus element and a phenol structure in the same molecule
- R 1 represents a hydrocarbon group of 6 to 50 carbon atoms containing a phenol moiety, a substituent such as a hydroxyl group, a halogen group, an alkoxyl group or an amino group, and a hydrocarbon group of 6 to 50 carbon atoms containing a phenol structure.
- R 4 represents a hydrogen, a hydrocarbon group having 1 to 50 carbon atoms, a hydrocarbon group having 1 to 50 carbon atoms containing a substituent such as a hydroxyl group, a halogen group, an alkoxyl group, or an amino group.
- R 2 and R 3 each independently represent hydrogen, a hydrocarbon group of 1 to 50 carbon atoms, a hydrocarbon group of 1 to 50 carbon atoms containing a substituent such as a hydroxyl group or an alkoxyl group.
- the hydrocarbon group may contain a branched structure, an alicyclic structure such as cyclohexyl, or an aromatic ring structure such as phenyl or naphthyl. The ends of R 2 and R 4 may be bonded together.
- Phosphorus compounds having a phosphorus element and a phenol structure in the same molecule include, for example, p-hydroxyphenylphosphonic acid, dimethyl p-hydroxyphenylphosphonate, diethyl p-hydroxyphenylphosphonate, diphenyl p-hydroxyphenylphosphonate, bis (p-hydroxyphenyl)phosphinic acid, methyl bis(p-hydroxyphenyl)phosphinate, phenyl bis(p-hydroxyphenyl)phosphinate, p-hydroxyphenylphosphinic acid, methyl p-hydroxyphenylphosphinate, p-hydroxyphenyl and phenyl phosphinate.
- a phosphorus element and a hindered phenol structure an alkyl group having a tertiary carbon (preferably a t-butyl group, thexyl An alkyl group having a tertiary carbon such as a group at the benzylic position; a neopentyl group, etc.) is bonded to one or two ortho positions of a hydroxyl group).
- the phosphorus compound used in the production of the polyester resin (B) is preferably dialkyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate represented by the following (chemical formula B).
- modified forms of dialkyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate may also be included. Details of the modified product will be described later.
- X 1 and X 2 each represent hydrogen and an alkyl group having 1 to 4 carbon atoms.
- a polyester resin in which at least one hindered phenol structure can be detected by the P-NMR measurement method of a solution dissolved in a hexafluoroisopropanol-based solvent is referred to as "having a hindered phenol structure.” That is, the polyester resin (B) is preferably a polyester resin produced using a phosphorus compound having a phosphorus element and a hindered phenol structure in the same molecule as a polymerization catalyst. A method for detecting the hindered phenol structure in the polyester resin (B) (P-NMR measurement method) will be described later.
- both X 1 and X 2 are preferably alkyl groups having 1 to 4 carbon atoms, more preferably alkyl groups having 1 to 2 carbon atoms.
- the ethyl ester having 2 carbon atoms is preferable because Irganox 1222 (manufactured by BASF) is commercially available and easily available.
- the phosphorus compound after heat-treating it in a solvent. Details of the heat treatment will be described later.
- the phosphorus compound when dialkyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate, which is the phosphorus compound shown in the above (Chemical Formula B), is used, in the above heat treatment, the reaction shown in (Chemical Formula B) A part of dialkyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate, which is a phosphorus compound, undergoes a structural change.
- the phosphorus compound includes structurally modified phosphorus compounds in addition to dialkyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate represented by (Chemical Formula B).
- elimination of the t-butyl group remarkably occurs at high temperature in the polymerization process.
- diethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate when diethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate is used as the phosphorus compound, part of diethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate has the structure Nine phosphorus compounds that have been altered are shown. The component amount of each structurally-changed phosphorus compound in the glycol solution can be quantified by the P-NMR measurement method.
- 3,5-di-tert-butyl-4-hydroxybenzylphosphonate 3,5-di-tert-butyl-4-hydroxy 3,5-di-tert-butyl-4-hydroxy compounds represented by the above nine chemical formulas can be used as phosphorus compounds in the present invention.
- Modified dialkyl benzylphosphonates may also be included.
- the polyester resin contains 9 types of phosphorus compound residues shown in Table 1 below.
- the polyester resin (B) has a phosphorus element and a hindered phenol structure in the same molecule. It can be said that it is a polyester resin produced by using a phosphorus compound having a polymerization catalyst. By using a phosphorus compound having a hindered phenol structure, sufficient polymerization activity can be exhibited while suppressing the cost of the catalyst.
- the content of the phosphorus element in the polyester resin (B) is 13 to 31 mass ppm, preferably 15 to 29 mass ppm, more preferably 16 to 28 mass ppm. If the elemental phosphorus content is less than 13 ppm by mass, the polymerization activity may decrease and the amount of aluminum-based contaminants may increase. On the other hand, if it exceeds 31 ppm by mass, the polymerization activity may be lowered, the amount of the phosphorus compound added may be increased, and the catalyst cost may be increased.
- the molar ratio of the phosphorus element to the aluminum element (hereinafter referred to as the "remaining molar ratio of the phosphorus element to the aluminum element" in order to distinguish from the “addition molar ratio of the phosphorus element to the aluminum element” described later) is 1.32 to 1.80, preferably 1.38 to 1.68.
- the aluminum element and the phosphorus element in the polyester resin (B) are respectively derived from the aluminum compound and the phosphorus compound used as the polymerization catalyst for the polyester resin (B).
- the resin produced using a polymerization catalyst consisting of an aluminum compound and a phosphorus compound has a higher catalyst cost (higher production cost) than a polyester resin produced using a catalyst such as an antimony catalyst.
- a catalyst cost high production cost
- the aluminum compound and the phosphorus compound together in a specific ratio sufficient polymerization activity can be exhibited while suppressing the cost of the catalyst. If the residual molar ratio of elemental phosphorus to elemental aluminum is less than 1.32, the thermal stability and thermal oxidation stability may decrease, and the amount of aluminum-based contaminants may increase. On the other hand, if the residual molar ratio of elemental phosphorus to elemental aluminum exceeds 1.80, the amount of phosphorus compound added becomes too large, resulting in an increase in catalyst cost.
- the polymerization catalyst used for the production of the polyester resin (B) in addition to the above-mentioned aluminum compound and phosphorus compound, other polymerization catalysts such as antimony compounds, germanium compounds, and titanium compounds are used to improve the properties and workability of the polyester resin (B). , color tone, etc., may be used in combination within a range that does not cause problems with the product.
- the content of the antimony element in the polyester resin (B) is preferably 30 ppm by mass or less
- the content of the germanium element in the polyester resin (B) is preferably 10 ppm by mass or less
- the polyester resin (B ) is preferably 3 ppm by mass or less.
- the content of the aluminum element corresponding to the aluminum-based foreign matter in the polyester resin (B) is preferably 3000 mass ppm or less, more preferably 2800 mass ppm or less, still more preferably 2000 mass ppm or less, and more More preferably, it is 1500 mass ppm or less.
- the aluminum-based foreign matter originates from the aluminum compound used as the polymerization catalyst, and is a foreign matter insoluble in the polyester resin (B). If the content of the aluminum-based foreign matter exceeds the above range, fine foreign matter insoluble in the polyester resin (B) may cause deterioration in the quality of the molded product. In addition, it also leads to the problem that filter clogging increases during polyester filtration in the polycondensation process and the molding process.
- a preferred lower limit for the content of the aluminum element corresponding to the aluminum-based foreign matter is 0 ppm by mass, but is about 300 ppm by mass due to technical difficulties.
- this index is based on the amount of aluminum element and relatively evaluates the amount of aluminum-based foreign matter. It does not indicate the absolute value of the amount of aluminum-based contaminants contained in the polyester resin.
- the intrinsic viscosity of the polyester resin (B) is preferably 0.56 dl/g or more, more preferably 0.56 to 0.90 dl/g, and more preferably 0.60 to 0.80 dl/g. It is more preferably 0.65 to 0.75 dl/g, and particularly preferably 0.65 to 0.75 dl/g. If the intrinsic viscosity of the polyester resin (B) is less than 0.56 dl/g, there is a risk that a large amount of fines will be generated due to friction between the polyester resin pellets and the air feeding pipe when the polyester resin (B) is air-fed.
- polyester resin (B) having an intrinsic viscosity exceeding 0.62 dl/g is to be produced only by melt polymerization, the economic efficiency may decrease.
- B) it is preferable to polymerize the polyester resin (B) obtained by melt polymerization by a solid phase polymerization method.
- the intrinsic viscosity retention rate of the polyester resin (B) is preferably 93% or more, more preferably 94% or more, and even more preferably 95% or more. If the intrinsic viscosity retention rate of the polyester resin (B) is less than 93%, the intrinsic viscosity retention rate of the polyester resin composition (C) may be low, resulting in insufficient recyclability. Although the upper limit of the intrinsic viscosity retention rate of the polyester resin (B) is preferably 100%, it is about 99% due to technical difficulties.
- the polyester resin composition (C) is preferably produced by mixing the polyester resin (A) and the polyester resin (B) at a mass ratio of 5:95 to 95:5. That is, in the polyester resin composition (C), it is preferable that the polyester resin (A) is 5 to 95 parts by mass with respect to a total of 100 parts by mass of the polyester resin (A) and the polyester resin (B). Within the above range, coloring of the polyester resin composition (C) and reduction in molecular weight can be suppressed. In this specification, suppression of coloration refers to suppression of a decrease in the L value described later and an increase in the b value described later even when the number of recycling times is repeated (re-kneading is repeated).
- the blending ratio of the polyester resin (A) exceeds 95 parts by mass, the intrinsic viscosity retention rate of the polyester resin composition (C) may become low, resulting in insufficient recyclability.
- the blending ratio of the polyester resin (A) is less than 5 parts by mass, there is a possibility that the effect of suppressing coloration will saturate and the economy will decrease.
- the polyester resin (B) is produced using a polymerization catalyst comprising an aluminum compound and a phosphorus compound, even if the residual molar ratio of the phosphorus element to the aluminum element is within the above predetermined range, The cost of the catalyst is higher (higher manufacturing cost) than the polyester resin produced using a catalyst such as an antimony catalyst, but the polyester resin (A) and the polyester resin (B) can be used in combination. Recyclability can also be improved while suppressing manufacturing costs. In the present invention, the production cost of the polyester resin (B) is reduced as much as possible.
- the mass ratio of polyester resin (A) to polyester resin (B) is more preferably 20:80 to 80:20, and even more preferably 25:75 to 75:25.
- the polyester resin composition (C) can be produced by dry-blending the polyester resin (A) and the polyester resin (B).
- the polyester resin composition (C) may be produced by kneading the polyester resin (A) and the polyester resin (B) by a melt extrusion method.
- general The polyester resin composition (C) can be produced by melting and kneading using a kneading apparatus for resins.
- a twin-screw extruder, a four-screw extruder, a single-screw planetary extruder, and the like, which are excellent in surface renewal are preferred.
- the extruder has at least one or more, preferably two or more, more preferably three or more vent ports, and the vent ports are connected to a reduced pressure system to prevent deterioration of the polyester resin composition (C). Suppression is the preferred embodiment.
- the intrinsic viscosity of the polyester resin composition (C) is preferably 0.56 to 0.90 dl/g, preferably 0.60 to 0.80 dl/g, and 0.70 to 0.75 dl/g. g is more preferred. If the intrinsic viscosity of the polyester resin composition (C) exceeds 0.90 dl/g, there is a possibility that the economic efficiency will decrease.
- the intrinsic viscosity retention rate of the polyester resin composition (C) is preferably 89% or more, more preferably 90% or more, still more preferably 92% or more, particularly 94% or more. preferable. If the intrinsic viscosity retention rate of the polyester resin composition (C) is less than 89%, the recyclability may be insufficient. Although the upper limit of the intrinsic viscosity retention rate of the polyester resin composition (C) is preferably 100%, it is about 99% due to technical difficulties. Moreover, the intrinsic viscosity retention rate of the polyester resin composition (C) is preferably higher than the intrinsic viscosity retention rate of the polyester resin (A).
- the re-kneaded product obtained by re-kneading the polyester resin composition (C) only once refers to the intrinsic viscosity retention rate.
- the physical properties of the polyester resin composition (C) refer to physical properties of a re-kneaded product obtained by re-kneading the polyester resin composition (C) only once, unless otherwise specified for physical properties other than the intrinsic viscosity retention rate. .
- the amount of CT (cyclic trimer) contained in the re-kneaded product obtained by re-kneading the polyester resin composition (C) once is preferably 6600 ppm or less. It is more preferably 6400 ppm or less, still more preferably 6000 ppm or less. Although the lower limit is not limited, it is about 2500 ppm due to technical difficulties. If the CT amount exceeds 6600 ppm, there is a possibility that mold contamination will increase during molding.
- the value obtained by subtracting the CT amount of the re-kneaded product obtained by re-kneading the polyester resin composition (C) once from the CT amount of the re-kneaded product obtained by re-kneading the polyester resin composition (C) three times ( ⁇ CT) is 900 ppm or less.
- It is more preferably 700 ppm or less, still more preferably 600 ppm or less.
- the lower limit is preferably 0 ppm, it is about 200 ppm due to technical difficulties. If ⁇ CT exceeds 900 ppm, there is a possibility that mold contamination during molding will increase.
- the polyester resin composition (C) contains the polyester resin (B) produced using the above Irganox 1222 as a phosphorus compound
- the polyester resin composition (C) is subjected to the P-NMR measurement method. At least one of the nine hindered phenol structures shown in 1 is detected. The same is true when a phosphorus compound having a phosphorus element and a hindered phenol structure in the same molecule other than Irganox 1222 is used as a polymerization catalyst.
- the method for producing the hollow molded article (D) is not particularly limited. (direct molding method) and the like.
- the polyester resin (B) is produced using a polymerization catalyst composed of an aluminum compound and a phosphorus compound, the cost of the catalyst is higher than that of the polyester resin produced using a catalyst such as an antimony catalyst. (Manufacturing cost is high), but by manufacturing the hollow molded article (D) by using the polyester resin (A) and the polyester resin (B) together, it is possible to reduce the manufacturing cost and improve the recyclability. can. In the present invention, the production cost of the polyester resin (B) is reduced as much as possible. When the blending ratio of the polyester resin (A) is increased, the manufacturing cost of the hollow molded article (D) can be suppressed, but the color tone deteriorates as the number of recycling times increases.
- the blending ratio of the polyester resin (B) may be appropriately set according to market requirements, but the mass ratio of the polyester resin (A) and the polyester resin (B) is 5:95 to 95:5. It is preferable to mix them to produce the hollow molded article (D).
- the field of application of the hollow molded body (D) is not particularly limited, but it can be used for mineral water, juice, wine, whiskey and other beverage containers, household and dishwashing detergent containers, baby bottles, bottled food containers, hair styling products, cosmetics, and the like. It can be used as various containers and the like.
- the hollow molded article (D) is produced by molding a blend containing the high-quality polyester resin composition (C) or the high-quality polyester resin (B). Even if it is collected and recycled after being used as a container, the polyester resin can be reused while maintaining its high quality. can contribute to problem solving.
- the method for producing the hollow molded body is not particularly limited.
- a blend obtained by blending the polyester resin (A) and the polyester resin (B) by dry blending or the like is dried by a vacuum drying method or the like, and then extruded or extruded.
- a bottomed preform is obtained by a method of molding with a molding machine such as an injection molding machine, or a method of molding by introducing the melt of the polyester resin composition (C) in a molten state into a molding machine.
- a final hollow molded article can be produced from the preformed article by a blow molding method such as stretch blow molding, direct blow molding, or extrusion blow molding.
- a molded article obtained by a molding machine such as the extrusion molding machine or the injection molding machine may be used as the final hollow molded article.
- the hollow molded body can have a multi-layered structure provided with a gas barrier layer such as polyvinyl alcohol or poly-meta-xylylenediamine adipate, a light-shielding resin layer, and the like. It is also possible to coat the inside and outside of the container with a layer of metal such as aluminum or diamond-like carbon using a method such as PVD (physical vapor deposition) or CVD (chemical vapor deposition).
- a gas barrier layer such as polyvinyl alcohol or poly-meta-xylylenediamine adipate, a light-shielding resin layer, and the like.
- a layer of metal such as aluminum or diamond-like carbon using a method such as PVD (physical vapor deposition) or CVD (chemical vapor deposition).
- the polyester resin composition (C) may be molded into the hollow molded article (D) by the above method. It may be molded into a hollow molded body (D) after drying.
- the above-mentioned polyester resin composition (C) or a blend obtained by dry blending the polyester resin (A) and the polyester resin (B) has a suppressed intrinsic viscosity retention rate and a reduced degree of coloring.
- D can also be suitably used for other products such as fibers, non-woven fabrics, sheets and films.
- the content of aluminum element in the polyester resin (B) is 9 to 20 mass ppm (5)
- the content of phosphorus element in the polyester resin (B) is 13 to 31 mass ppm (6)
- the residual molar ratio of the phosphorus element to the aluminum element in the polyester resin (B) is 1.32 or more and 1.80 or less
- the polyester resin (B) As a method for producing the polyester resin (B), a first step of synthesizing a polyester or an oligomer thereof, which is a polycondensate (low-order condensate) as an intermediate, and a second step of further polycondensing the intermediate. It is preferable to have
- a solution S in which an aluminum compound is dissolved in the intermediate and a solution T in which a phosphorus compound is dissolved are mixed so as to satisfy the following (7) to (9). It is preferable to add to Polyvalent carboxylic acids and ester-forming derivatives thereof used in the production of the polyester resin (B), hydroxycarboxylic acids that may be added in small amounts and ester-forming derivatives thereof, and cyclic esters that may be added in small amounts are added during polymerization. , and almost 100% of the amount initially added to the system as a catalyst remains in the polyester resin (B) produced by polymerization. It is possible to calculate the mass of the "polyester resin to be used".
- the amount of aluminum element added to the produced polyester resin (B) is 9 to 20 mass ppm (more preferably 9 to 19 mass ppm, still more preferably 10 to 17 mass ppm, particularly preferably 12 to 17 mass ppm).
- the amount of phosphorus element added to the polyester resin (B) to be produced is 20 to 40 mass ppm (more preferably 20 to 38 mass ppm, more preferably 21 to 36 mass ppm).
- the molar ratio of the added amount of phosphorus element in (8) to the added amount of aluminum element in (7) (hereinafter referred to as "the added molar ratio of phosphorus element to aluminum element") is 1.50 or more. 50 or less (more preferably 1.50 to 2.30, more preferably 1.60 to 2.20)
- the method for producing the polyester or its oligomer, which is a low-order condensate (low polymer) synthesized in the first step is not particularly limited.
- the method for producing the polyester resin (B) is to be carried out by a method comprising conventionally known steps, except that a polyester polymerization catalyst comprising an aluminum compound and a phosphorus compound is used as a catalyst and that the addition amount of the polyester polymerization catalyst is noted. can be done.
- a polyester polymerization catalyst comprising an aluminum compound and a phosphorus compound
- other copolymer components are directly reacted to distill off water and esterify, followed by polycondensation under normal pressure or reduced pressure.
- the amount (mass) of the polyester resin (B) to be produced can be calculated from the amount (mass) of polyvalent carboxylic acid containing dicarboxylic acid or the like used as a raw material.
- esterification reaction or transesterification reaction may be carried out in one step or in multiple steps.
- polyester resin produced by the melt polymerization method may be additionally polymerized by the solid phase polymerization method.
- the solid-phase polymerization reaction can be carried out in a continuous apparatus like the melt polycondensation reaction.
- the first stage is the initial stage
- the final stage is the late stage
- from the second stage The stage immediately before the final stage is defined as an intermediate stage
- the reaction conditions for the polymerization reaction in the intermediate stage are preferably between the reaction conditions for the initial stage and the reaction conditions for the final stage.
- the degree of increase in intrinsic viscosity achieved in each of these polymerization reaction steps is smoothly distributed.
- Solid phase polymerization method In order to increase the intrinsic viscosity, a polyester resin produced by a melt polymerization method may be solid phase polymerized.
- the solid phase polymerization may be a batch polymerization method or a continuous polymerization method, but the solid phase polymerization is preferably carried out in a continuous apparatus like the melt polymerization.
- the polyester resin produced by the melt polymerization method by the solid phase polymerization method.
- Solid phase polymerization is carried out by converting the polyester obtained in the second step (melt polymerization) into powder.
- Granules mean chips, pellets, flakes and powdered polyester, preferably chips or pellets.
- the above solid phase polymerization is carried out by heating the powdery polyester at a temperature below the melting point of the polyester under inert gas flow or under reduced pressure.
- the solid phase polymerization process may be carried out in one step, or may be carried out in multiple steps.
- the powdery polyester supplied to the solid-phase polymerization step may be preliminarily crystallized by heating to a temperature lower than the temperature at which the solid-phase polymerization is performed, and then supplied to the solid-phase polymerization step.
- Such a preliminary crystallization step may be carried out by heating the powdery and granular polyester in a dry state to a temperature of usually 120 to 200°C, preferably 130 to 180°C for 1 minute to 4 hours, or the powdery and granular polyester may be It may be carried out by heating at a temperature of usually 120 to 200° C. for 1 minute or longer in a steam atmosphere, a steam-containing inert gas atmosphere, or a steam-containing air atmosphere.
- the polyester melt-polymerized as described above is, for example, chipped and then transported to a storage silo or a solid-phase polymerization process in a transport pipe.
- chips are transported by, for example, a forced low-density transport method using air, a large impact force is applied to the surface of the melt-polymerized polyester chips due to collision with piping, resulting in fine or film-like particles.
- Such fines and films have the effect of promoting the crystallization of the polyester, and when present in a large amount, the transparency of the resulting molded product is very poor. Therefore, adding a step of removing such fines and films is one of the preferred embodiments.
- the method for removing the above fines and film-like substances is not limited, but for example, a vibrating sieve step separately installed in an intermediate step between the solid phase polymerization step and a post-process installed after the solid phase polymerization step and Examples include a method of treating by an air classification process using an air flow, a gravity classification process, and the like.
- aluminum compounds and phosphorus compounds are used as catalysts, they are preferably added in the form of a slurry or a solution, more preferably a solution dissolved in a solvent such as water or glycol, and a solution dissolved in water and/or glycol is used. more preferably, and most preferably a solution in ethylene glycol is used.
- the content (residual amount) of the solution S in which the aluminum compound is dissolved and the solution T in which the phosphorus compound is dissolved in the polyester resin (B) at any stage up to the start of the polymerization reaction in the manufacturing process of the polyester resin (B) is the above. It is preferable to add in a range that satisfies (4) to (6).
- the catalyst amount A complex having catalytic activity is functionally formed in the polymerization system while (catalyst cost) is kept low, and sufficient polymerization activity can be exhibited. Also, the generation of aluminum-based foreign matter can be suppressed.
- the solution S in which the aluminum compound is dissolved and the solution T in which the phosphorus compound is dissolved it is a more preferable embodiment to prepare a mixed liquid by mixing in and add the one-liquid mixed liquid to the intermediate.
- the method of making one solution in advance include a method of mixing the respective solutions in a tank, a method of joining the pipes to which the catalyst is added in the middle and mixing the solutions, and the like.
- the solution S in which the aluminum compound is dissolved and the solution T in which the phosphorus compound is dissolved are preferably added before the start of the polymerization reaction and after the completion of the esterification reaction or the transesterification reaction, and after the first step. It is more preferable to add a solution S in which an aluminum compound is dissolved and a solution T in which a phosphorus compound is dissolved to the intermediate before the second step. If it is added before the completion of the esterification reaction or transesterification reaction, the amount of aluminum-based contaminants may increase.
- the polyester resin (B) comprises at least one selected from polyhydric carboxylic acids and ester-forming derivatives thereof and at least one selected from polyhydric alcohols and ester-forming derivatives thereof
- the aluminum compound is dissolved.
- the solution S obtained by dissolving the aluminum compound is preferably a glycol solution in which the aluminum compound is dissolved
- the solution T in which the phosphorus compound is dissolved is preferably a glycol solution in which the phosphorus compound is dissolved.
- the phosphorus compound used in the production of the polyester resin (B) is preferably heat-treated in a solvent.
- the solvent to be used is not limited as long as it is at least one selected from the group consisting of water and alkylene glycol.
- alkylene glycol it is preferable to use a solvent that dissolves a phosphorus compound, and a polyester resin such as ethylene glycol ( It is more preferable to use glycol as a component of B).
- the heat treatment in the solvent is preferably performed after dissolving the phosphorus compound, but it does not have to be completely dissolved.
- the heat treatment temperature is preferably 170 to 196°C, more preferably 175 to 185°C, and still more preferably 175 to 180°C.
- the heat treatment time is preferably 30 to 240 minutes, more preferably 50 to 210 minutes.
- the concentration of the phosphorus compound during the heat treatment is preferably 3 to 10% by mass.
- the acidity of the phosphorus compound contained in the glycol solution can be made constant, the polymerization activity is improved by using it together with the aluminum compound, and the amount of aluminum-based foreign matter caused by the polymerization catalyst is suppressed.
- the amount of the phosphorus compound distilled off in the polymerization process can be suppressed, and the economic efficiency can be improved. Therefore, it is preferable to perform the above heat treatment.
- IV Intrinsic viscosity
- polyester resin (B) was subjected to wet decomposition with sulfuric acid, nitric acid and perchloric acid, and then neutralized with aqueous ammonia. After adding ammonium molybdate and hydrazine sulfate to the prepared solution, absorbance at a wavelength of 830 nm was measured using an ultraviolet-visible spectrophotometer (UV-1700, manufactured by Shimadzu Corporation). The concentration of elemental phosphorus in the polyester resin (B) was obtained from a previously prepared calibration curve.
- UV-1700 ultraviolet-visible spectrophotometer
- polyester resin (B) 30 g of polyester resin (B) and 250 mL of a mixed solution of p-chlorophenol/tetrachloroethane (3/1: mass ratio) were placed in a 500 mL Erlenmeyer flask containing a stirrer. It was charged and melted by heating at 100 to 105° C. for 1.5 hours using a hot stirrer. Foreign matter was removed from the solution using a polytetrafluoroethylene membrane filter (Advantec PTFE membrane filter, product name: T100A047A) with a diameter of 47 mm and a pore size of 1.0 ⁇ m. The effective filtration diameter was 37.5 mm.
- Advanced PTFE membrane filter Advanced PTFE membrane filter
- the filter was washed with 50 mL of chloroform and then dried.
- the amount of aluminum element on the filtered surface of the membrane filter was quantified with a scanning fluorescent X-ray analyzer (manufactured by RIGAKU, ZSX100e, Rh line ball 4.0 kW). Quantitation was performed on a central portion of the membrane filter with a diameter of 30 mm.
- the calibration curve for the fluorescent X-ray analysis method was determined using a polyethylene terephthalate resin with a known aluminum element content, and the apparent aluminum element content was expressed in ppm.
- the measurement was carried out by measuring the Al-K ⁇ ray intensity under the conditions of X-ray output of 50 kV-70 mA, pentaerythritol as an analyzing crystal, PC (proportional counter) as a detector, and PHA (pulse height analyzer) of 100-300. .
- the amount of aluminum element in the polyethylene terephthalate resin for the calibration curve was quantified by high frequency inductively coupled plasma emission spectrometry.
- Apparatus Fourier transform nuclear magnetic resonance apparatus (BRUKER, AVANCE500) 31P resonance frequency: 202.456MHz Lock solvent: deuterated benzene Flip angle of detection pulse: 65° Data acquisition time: 1.5 seconds Delay time: 0.5 seconds Proton decoupling: Full decoupling Measurement temperature: 25-35°C Cumulative number: about 20,000 to 30,000 The peak wavelengths of the chemical formula number residues shown in Table 1 are shown below. When these peak wavelengths were detected, it was determined that the sample had a hindered phenol structure.
- Chemical formula 1 34.5 ppm, chemical formula 4: 30.5 ppm, chemical formula 7: 53.6 ppm Chemical formula 2: 33.8 ppm, Chemical formula 5: 30.1 ppm, Chemical formula 8: 53.0 ppm Chemical formula 3: 31.9 ppm, chemical formula 6: 28.7 ppm, chemical formula 9: 51.3 ppm
- Measurement method JIS Z8722 compliant Transmitted light 0 degree, -0 degree method
- Detection element Silicon photodiode array
- Light source Halogen lamp 12V100W 2000H
- Measurement area transmission 25mm ⁇ Humidity and temperature conditions: 25°C, RH50%
- Measurement cell ⁇ 35mm, height 25mm
- polyester resin (A-1) 20 mg of polyester resin (A-1) was dissolved in 0.6 ml of a mixed solvent in which heavy hexafluoroisopropanol and heavy chloroform were mixed at a ratio of 1:9 (volume ratio), Centrifugation was performed. After that, the supernatant was collected and subjected to 1 H-NMR measurement under the following conditions.
- Apparatus Fourier transform nuclear magnetic resonance apparatus (manufactured by BRUKER, AVANCE NEO600) 1H resonance frequency: 600.13MHz Lock solvent: heavy chloroform
- Lock solvent heavy chloroform
- Polyester resin (B'-1) (a polyester resin for reference example, which is the residual amount of aluminum element and the residual amount of phosphorus element, which were conventionally considered optimal)
- a 10 L stainless steel autoclave equipped with a stirrer was charged with pre-mixed polyester oligomer consisting of high-purity terephthalic acid and ethylene glycol with an esterification rate of about 95%, and high-purity terephthalic acid, and an esterification reaction was carried out at 260 ° C. , to obtain an oligomer mixture.
- the resulting oligomer mixture had an acid end group concentration of 750 eq/ton and a hydroxyl group end ratio (OH %) of 59 mol %.
- oligomer mixture To the resulting oligomer mixture was added a mixture obtained by mixing the aluminum-containing ethylene glycol solution s and the phosphorus-containing ethylene glycol solution t prepared by the above method to form a one-liquid mixture.
- the mixed solution was prepared so that the aluminum element and the phosphorus element were 21 mass ppm and 58 mass ppm, respectively, relative to the mass of the oligomer mixture.
- the added molar ratio of the phosphorus element to the aluminum element was 2.41.
- the amount of polyester resin to be produced can be calculated from the amount of terephthalic acid to be added.
- the mixture is added so that the After that, the temperature of the system was raised to 280° C. in 1 hour, and the pressure of the system was gradually reduced to 0.15 kPa during this time.
- a polyester resin was obtained. Thereafter, the obtained polyester resin is solid-phase polymerized at 230° C. under reduced pressure for 7 hours using a batch-type solid-phase polymerization apparatus, and a polyester resin (B′- 1) was obtained.
- the residual amount of aluminum element was 21 mass ppm
- the residual amount of phosphorus element was 45 mass ppm
- the residual molar ratio of phosphorus element to aluminum element was 1.87.
- the content of the aluminum element corresponding to the aluminum foreign matter in the polyester resin (B'-1) is 710 mass ppm
- the L value of the polyester resin (B'-1) is 58.7
- the polyester resin (B'- 1) was confirmed to have a hindered phenol structure.
- Polyester resin (B-1) A polyester resin (B-1) was obtained in the same manner as the polyester resin (B'-1), except that the added amounts of the aluminum element and the phosphorus element were different.
- the residual amount of aluminum element in polyester resin (B-1) was 16 mass ppm
- the residual amount of phosphorus element was 26 mass ppm
- the residual molar ratio of phosphorus element to aluminum element was 1.42.
- the content of the aluminum element corresponding to the aluminum foreign matter in the polyester resin (B-1) is 2000 ppm by mass
- the L value of the polyester resin (B-1) is 58.5. It was confirmed that the compound has a hindered phenol structure.
- Polyester resin (B-2) A polyester resin (B-2) was obtained in the same manner as the polyester resin (B'-1), except that the added amounts of the aluminum element and the phosphorus element were different.
- polyester resin (B-2) the residual amount of aluminum element was 10 mass ppm, the residual amount of phosphorus element was 16 mass ppm, and the residual molar ratio of phosphorus element to aluminum element was 1.39.
- the content of the aluminum element corresponding to the aluminum-based foreign matter in the polyester resin (B-2) is 2300 ppm by mass, and the L value of the polyester resin (B-2) is 56.6. It was confirmed that the compound has a hindered phenol structure.
- polyester resin (A-1) As the polyester resin (A-1), recovered polyester resin flakes provided by Kyoei Sangyo Co., Ltd. were used. As a result of compositional analysis, it was confirmed that the recovered polyester resin flakes contained 97 mol % or more of ethylene terephthalate structural units. The intrinsic viscosity of the recovered polyester resin flakes was 0.750 dl/g. The content of antimony element in the recovered polyester resin flakes was 190 ppm by mass, and the content of germanium element was 1.6 ppm by mass. Note that the content of the titanium element is as small as 1 ppm by mass or less, so the description of the content of the titanium element is omitted in Tables 2 and 3. From the contents of the elements antimony, germanium, and titanium, it can be confirmed that the recovered polyester resin flakes are mainly composed of hollow moldings using a polyester resin produced with an antimony catalyst. rice field.
- Examples 1 to 7, Reference Example 6 A polyester resin composition was obtained by melt-kneading the polyester resin (A-1) and the polyester resin (B) at the compounding ratios shown in Tables 2 and 3. Various properties of the polyester resin composition are shown in Tables 2 and 3.
- Table 3 shows various properties of the polyester resin (A-1), the polyester resin (B-1), the polyester resin (B-2), and the following polyester resins (E) to (G) alone.
- the polyester resins (E) to (G) are polyester resins produced using at least one of an antimony catalyst, a titanium catalyst, and a germanium catalyst, and the content of each element of antimony, titanium, and germanium is Measured by the measurement method.
- a polyester resin composition could be obtained by melt-kneading the polyester resin (A-1) and any of the polyester resins (E) to (G) at the compounding ratio shown in Table 3.
- Various properties of the polyester resin composition are shown in Table 3.
- the recovered polyester resin (A-1) was mixed with the polyester resin (B-1) or the polyester resin (B-2) to recycle multiple times. It was possible to obtain a polyester resin composition in which the L value, which is a measure of darkening, remains high and the b value, which is a measure of yellowness, remains low. These characteristics are comparable to those of Reference Example 6.
- the polyester resin (B-1) and the polyester resin (B-2) have a shorter polymerization time than the polyester resin (B'-1), although the added amounts of the aluminum element and the phosphorus element are small. In addition, the amount of aluminum-based contaminants is small, so the quality is high. In addition, since the amount of catalyst added is small, the cost of the catalyst can be reduced.
- Reference Example 1 using the polyester resin (B-1) and Reference Example 2 using the polyester resin (B-2) are excellent in recyclability.
- polyester resins containing antimony element, titanium element, or germanium element were used, and in Comparative Examples 2 to 4, polyester resins containing antimony element, titanium element, or germanium element were recovered. This is the case where it is mixed with the polyester resin (A-1). Although the polyester resin containing antimony element, titanium element, or germanium element has a high intrinsic viscosity retention rate (Reference Examples 3 to 5), antimony element is added to the recovered polyester resin (A-1).
- Titanium element, or even if a polyester resin containing a germanium element is mixed the intrinsic viscosity retention rate is about the same as when only the polyester resin (A-1) is recycled (Comparative Examples 2 to 4), and the recovered polyester Even when a polyester resin containing an antimony element, a titanium element, or a germanium element was mixed with the resin (A-1), the decrease in molecular weight could not be suppressed.
- the CT amount and ⁇ CT increase as the number of recycling times increases, and the recyclability is improved. I could't.
- polyester resin composition (C) by mixing polyester resin (B) containing predetermined amounts of aluminum compound and phosphorus compound with recovered polyester resin (A) to produce polyester resin composition (C) It is possible to suppress the decrease in molecular weight and the polyester resin composition excellent in recyclability can be obtained at low cost.
- the polyester resin (B) containing an aluminum compound and a phosphorus compound with the recovered polyester resin (A) to produce the hollow molded article (D) the hollow molded article (D) is colored and the molecular weight is reduced. It is possible to obtain a polyester resin composition that can suppress the decrease and has excellent recyclability.
- the polyester resin composition (C) and the hollow molded article (D) can be reused, it can contribute to solving various problems such as the suppression of resource depletion, the reduction of marine litter, and the suppression of global warming. can.
- the method for producing the polyester resin composition (C) of the first aspect according to the present disclosure includes the recovered polyester resin (A), the polyester resin (B) containing the aluminum compound and the phosphorus compound, and wherein the polyester resin (A) satisfies the following (1) to (3), and the polyester resin (B) satisfies the following (4) to (6).
- the polyester resin (A) contains at least one element selected from antimony, titanium, and germanium (2) The total content of the antimony element, the titanium element, and the germanium element in the polyester resin (A) (3) The intrinsic viscosity of the polyester resin (A) is 0.5 to 0.8 dl / g (4) The content of aluminum element in the polyester resin (B) is 9 (5) The content of the phosphorus element in the polyester resin (B) is 13 to 31 ppm by mass. (6) The residual molar ratio of the phosphorus element to the aluminum element in the polyester resin (B). is 1.32 or more and 1.80 or less
- a polyester resin (B) containing predetermined amounts of an aluminum compound and a phosphorus compound is mixed with a recovered polyester resin (A) containing at least one element selected from antimony, titanium, and germanium.
- the polyester resin (B) has an intrinsic viscosity of 0.56 dl/g or more.
- the polyester resin (B) when the polyester resin (B) is air-fed, a large amount of fines is less likely to occur due to friction between the polyester resin pellets and the air-fed piping.
- the phosphorus compound is 3,5-di-tert-butyl-4-hydroxybenzylphosphonic acid dialkyl ester.
- sufficient polymerization activity can be exhibited while suppressing the cost of the catalyst.
- the polyester resin (A) is 5 to 95 parts by mass with respect to a total of 100 parts by mass of the polyester resin (A) and the polyester resin (B).
- the fourth aspect it is possible to suppress the coloring of the polyester resin composition (C) and the decrease in molecular weight.
- the method for producing the hollow molded article (D) of the fifth aspect includes a step of melt-molding the polyester resin composition (C) produced by the production method of any one of the first to fourth aspects.
- the hollow molded article (D) includes a step of introducing the melt in a molten state into a molding machine and molding it.
- the recovered polyester resin (A) is mixed with the polyester resin (B) containing the aluminum compound and the phosphorus compound.
- the polyester resin (A) satisfies the following (1) to (3), and the polyester resin (B) satisfies the following (4) to (6).
- the polyester resin (A) contains at least one element selected from antimony, titanium, and germanium (2) The total content of the antimony element, the titanium element, and the germanium element in the polyester resin (A) (3) The intrinsic viscosity of the polyester resin (A) is 0.5 to 0.8 dl / g (4) The content of aluminum element in the polyester resin (B) is 9 (5) The content of the phosphorus element in the polyester resin (B) is 13 to 31 ppm by mass. (6) The residual molar ratio of the phosphorus element to the aluminum element in the polyester resin (B). is 1.32 or more and 1.80 or less
- the used and recovered polyester resin (A) containing at least one element selected from antimony, titanium, and germanium is regenerated into a polyester resin composition (C) having excellent recyclability. can do.
- the intrinsic viscosity of the polyester resin (B) is 0.56 dl/g or more.
- the polyester resin (B) when the polyester resin (B) is air-fed, a large amount of fines is less likely to occur due to friction between the polyester resin pellets and the air-fed piping.
- the phosphorus compound is 3,5-di-tert-butyl-4-hydroxybenzylphosphonic acid dialkyl ester.
- the polyester resin (A) of the ninth aspect in the sixth aspect, 5 parts by mass of the polyester resin (A) is added to a total of 100 parts by mass of the polyester resin (A) and the polyester resin (B). ⁇ 95 parts by mass.
- the polyester resin composition (C) to be regenerated can be prevented from being colored or reduced in molecular weight.
- the polyester resin composition (C) of the tenth aspect is a mixture of the recovered polyester resin (A) and the polyester resin (B) containing an aluminum compound and a phosphorus compound.
- the polyester resin (A) satisfies the following (1) to (3), and the polyester resin (B) satisfies the following (4) to (6).
- the polyester resin (A) contains at least one element selected from antimony, titanium, and germanium (2) The total content of the antimony element, the titanium element, and the germanium element in the polyester resin (A) (3) The intrinsic viscosity of the polyester resin (A) is 0.5 to 0.8 dl / g (4) The content of aluminum element in the polyester resin (B) is 9 (5) The content of the phosphorus element in the polyester resin (B) is 13 to 31 ppm by mass. (6) The residual molar ratio of the phosphorus element to the aluminum element in the polyester resin (B). is 1.32 or more and 1.80 or less
- the polyester resin composition (C) coloring and reduction in molecular weight of the polyester resin composition (C) can be suppressed, and a polyester resin composition with excellent recyclability can be obtained at low cost.
- the polyester resin composition (C) of the eleventh aspect is such that the polyester resin (B) has an intrinsic viscosity of 0.56 dl/g or more.
- the polyester resin (B) when the polyester resin (B) is air-fed, a large amount of fines is less likely to occur due to friction between polyester resin pellets or air-fed piping.
- the phosphorus compound is 3,5-di-tert-butyl-4-hydroxybenzylphosphonic acid dialkyl ester.
- the polyester resin composition (C) of the thirteenth aspect is, in the tenth aspect, the polyester resin (A) with respect to a total of 100 parts by mass of the polyester resin (A) and the polyester resin (B) ⁇ 95 parts by mass.
- the polyester resin composition (C) can be prevented from being colored or reduced in molecular weight.
- the hollow molded article (D) of the fourteenth aspect is formed from the polyester resin composition (C) according to any one of the tenth to thirteenth aspects.
- the hollow molded article (D) can improve recyclability while suppressing manufacturing costs.
- the hollow molded article (D) is produced by molding from the high-quality polyester resin composition (C), so that even if it is recovered and recycled after being used as various containers, the high quality is maintained.
- the polyester resin can be reused, and in turn, it can contribute to solving various problems such as the suppression of resource depletion, the reduction of marine litter, and the suppression of global warming.
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Abstract
Description
1.回収されたポリエステル樹脂(A)とアルミニウム化合物及びリン化合物を含むポリエステル樹脂(B)とを混合する工程を含み、前記ポリエステル樹脂(A)は下記(1)~(3)を満足し、前記ポリエステル樹脂(B)は下記(4)~(6)を満足することを特徴とするポリエステル樹脂組成物(C)の製造方法。
(1)前記ポリエステル樹脂(A)はアンチモン、チタン、及びゲルマニウムから選ばれる少なくとも一種の元素を含む
(2)前記ポリエステル樹脂(A)中におけるアンチモン元素、チタン元素、及びゲルマニウム元素の合計の含有量が2~500質量ppm
(3)前記ポリエステル樹脂(A)の固有粘度が0.5~0.8dl/g
(4)前記ポリエステル樹脂(B)中におけるアルミニウム元素の含有量が9~20質量ppm
(5)前記ポリエステル樹脂(B)中におけるリン元素の含有量が13~31質量ppm
(6)前記ポリエステル樹脂(B)中におけるアルミニウム元素に対するリン元素の残存モル比が1.32以上1.80以下
2.前記ポリエステル樹脂(B)の固有粘度が0.56dl/g以上である上記1.に記載のポリエステル樹脂組成物(C)の製造方法。
3.リン化合物が3,5-ジ-tert-ブチル-4-ヒドロキシベンジルホスホン酸ジアルキルエステルである上記1.又は2.に記載のポリエステル樹脂組成物(C)の製造方法。
4.前記ポリエステル樹脂(A)及び前記ポリエステル樹脂(B)の合計100質量部に対し、前記ポリエステル樹脂(A)が5~95質量部である上記1.~3.のいずれか1項に記載のポリエステル樹脂組成物(C)の製造方法。
5.上記1.~4.のいずれか1項に記載の製造方法で製造されたポリエステル樹脂組成物(C)を溶融成形する工程を含む中空成形体(D)の製造方法。
6.回収されたポリエステル樹脂(A)とアルミニウム化合物及びリン化合物を含むポリエステル樹脂(B)とを混合することによるポリエステル樹脂(A)の再生方法であって、前記ポリエステル樹脂(A)は下記(1)~(3)を満足し、前記ポリエステル樹脂(B)は下記(4)~(6)を満足することを特徴とするポリエステル樹脂(A)の再生方法。
(1)前記ポリエステル樹脂(A)はアンチモン、チタン、及びゲルマニウムから選ばれる少なくとも一種の元素を含む
(2)前記ポリエステル樹脂(A)中におけるアンチモン元素、チタン元素、及びゲルマニウム元素の合計の含有量が2~500質量ppm
(3)前記ポリエステル樹脂(A)の固有粘度が0.5~0.8dl/g
(4)前記ポリエステル樹脂(B)中におけるアルミニウム元素の含有量が9~20質量ppm
(5)前記ポリエステル樹脂(B)中におけるリン元素の含有量が13~31質量ppm
(6)前記ポリエステル樹脂(B)中におけるアルミニウム元素に対するリン元素の残存モル比が1.32以上1.80以下
7.前記ポリエステル樹脂(B)の固有粘度が0.56dl/g以上である上記6.に記載のポリエステル樹脂(A)の再生方法。
8.リン化合物が3,5-ジ-tert-ブチル-4-ヒドロキシベンジルホスホン酸ジアルキルエステルである上記6.又は7.に記載のポリエステル樹脂(A)の再生方法。
9.前記ポリエステル樹脂(A)及び前記ポリエステル樹脂(B)の合計100質量部に対し、前記ポリエステル樹脂(A)が5~95質量部である上記6.~8.のいずれか1項に記載のポリエステル樹脂(A)の再生方法。
10.回収されたポリエステル樹脂(A)とアルミニウム化合物及びリン化合物を含むポリエステル樹脂(B)との混合物であるポリエステル樹脂組成物(C)であって、前記ポリエステル樹脂(A)は下記(1)~(3)を満足し、前記ポリエステル樹脂(B)は下記(4)~(6)を満足することを特徴とするポリエステル樹脂組成物(C)。
(1)前記ポリエステル樹脂(A)はアンチモン、チタン、及びゲルマニウムから選ばれる少なくとも一種の元素を含む
(2)前記ポリエステル樹脂(A)中におけるアンチモン元素、チタン元素、及びゲルマニウム元素の合計の含有量が2~500質量ppm
(3)前記ポリエステル樹脂(A)の固有粘度が0.5~0.8dl/g
(4)前記ポリエステル樹脂(B)中におけるアルミニウム元素の含有量が9~20質量ppm
(5)前記ポリエステル樹脂(B)中におけるリン元素の含有量が13~31質量ppm
(6)前記ポリエステル樹脂(B)中におけるアルミニウム元素に対するリン元素の残存モル比が1.32以上1.80以下
11.前記ポリエステル樹脂(B)の固有粘度が0.56dl/g以上である上記10.に記載のポリエステル樹脂組成物(C)。
12.リン化合物が3,5-ジ-tert-ブチル-4-ヒドロキシベンジルホスホン酸ジアルキルエステルである上記10.又は11.に記載のポリエステル樹脂組成物(C)。
13.前記ポリエステル樹脂(A)及び前記ポリエステル樹脂(B)の合計100質量部に対し、前記ポリエステル樹脂(A)が5~95質量部である上記10.~12.のいずれか1項に記載のポリエステル樹脂組成物(C)。
14.上記10.~13.のいずれか1項に記載のポリエステル樹脂組成物(C)から形成された中空成形体(D)。
ポリエステル樹脂(A)は、エチレンテレフタレート構造単位を50モル%以上含むことが好ましく、70モル%以上含有していることがより好ましく、80モル%以上含むことがさらに好ましく、90モル%以上含有することが特に好ましい。テレフタル酸以外の多価カルボン酸成分、エチレングリコール以外の多価アルコール成分としては、後述するポリエステル樹脂(B)に記載の成分が使用可能である。
ポリエステル樹脂(B)はアルミニウム化合物及びリン化合物を含むものであり、すなわち、ポリエステル樹脂(B)は、アルミニウム化合物とリン化合物からなる重合触媒を触媒量用いて製造されている。ポリエステル樹脂(B)は、回収されたポリエステル樹脂(A)に混合することで該ポリエステル樹脂(A)を再生することができる再生用ポリエステル樹脂である。
ポリエステル樹脂(B)を構成する主たる多価カルボン酸成分がジカルボン酸であることが好ましい。「主たる多価カルボン酸成分がジカルボン酸である」とは、全多価カルボン酸成分に対してジカルボン酸を50モル%より多く含有することであり、ジカルボン酸を70モル%以上含有することが好ましく、ジカルボン酸を80モル%以上含有することがより好ましく、ジカルボン酸を90モル%以上含有することがさらに好ましい。なお、ジカルボン酸を二種以上用いる場合はそれらの合計が上記範囲内であることが好ましい。
ポリエステル樹脂(B)を構成する主たる多価アルコール成分がグリコールであることが好ましい。「主たる多価アルコール成分がグリコールである」とは、全多価アルコール成分に対してグリコールを50モル%より多く含有することであり、70モル%以上含有することが好ましく、80モル%以上含有することがより好ましく、90モル%以上含有することがさらに好ましい。なお、グリコールを二種以上用いる場合はそれらの合計が上記範囲内であることが好ましい。
上述のとおり、ポリエステル樹脂(B)は、アルミニウム化合物とリン化合物からなる重合触媒を用いて製造されている。
ポリエステル樹脂(B)の重合触媒を構成するアルミニウム化合物は溶媒に溶解するものであれば限定されず、公知のアルミニウム化合物が限定なく使用できる。アルミニウム化合物として、例えば、ギ酸アルミニウム、酢酸アルミニウム、塩基性酢酸アルミニウム、プロピオン酸アルミニウム、シュウ酸アルミニウム、アクリル酸アルミニウム、ラウリン酸アルミニウム、ステアリン酸アルミニウム、安息香酸アルミニウム、トリクロロ酢酸アルミニウム、乳酸アルミニウム、クエン酸アルミニウム、酒石酸アルミニウム、サリチル酸アルミニウムなどのカルボン酸塩;塩化アルミニウム、水酸化アルミニウム、水酸化塩化アルミニウム、硝酸アルミニウム、硫酸アルミニウム、炭酸アルミニウム、リン酸アルミニウム、ホスホン酸アルミニウムなどの無機酸塩;アルミニウムメトキサイド、アルミニウムエトキサイド、アルミニウムn-プロポキサイド、アルミニウムイソプロポキサイド、アルミニウムn-ブトキサイド、アルミニウムt-ブトキサイドなどアルミニウムアルコキサイド;アルミニウムアセチルアセトネート、アルミニウムエチルアセトアセテート、アルミニウムエチルアセトアセテートジiso-プロポキサイドなどのキレート化合物;トリメチルアルミニウム、トリエチルアルミニウムなどの有機アルミニウム化合物およびこれらの部分加水分解物、アルミニウムのアルコキサイドやアルミニウムキレート化合物とヒドロキシカルボン酸からなる反応生成物、酸化アルミニウム、超微粒子酸化アルミニウム、アルミニウムシリケート、アルミニウムとチタンやケイ素やジルコニウムやアルカリ金属やアルカリ土類金属などとの複合酸化物などが挙げられる。これらのうちカルボン酸塩、無機酸塩、およびキレート化合物から選ばれる少なくとも1種が好ましく、これらの中でも酢酸アルミニウム、塩基性酢酸アルミニウム、塩化アルミニウム、水酸化アルミニウム、水酸化塩化アルミニウム、及びアルミニウムアセチルアセトネートから選ばれる少なくとも1種がより好ましく、酢酸アルミニウム、塩基性酢酸アルミニウム、塩化アルミニウム、水酸化アルミニウム、水酸化塩化アルミニウム、及びアルミニウムアセチルアセトネートから選ばれる少なくとも1種がさらに好ましく、酢酸アルミニウム及び塩基性酢酸アルミニウムから選ばれる少なくとも1種が特に好ましく、塩基性酢酸アルミニウムが最も好ましい。
ポリエステル樹脂(B)の重合触媒を構成するリン化合物としては、特に限定はされないが、ホスホン酸系化合物、ホスフィン酸系化合物を用いると触媒活性の向上効果が大きいため好ましく、これらの中でもホスホン酸系化合物を用いると触媒活性の向上効果が特に大きいためより好ましい。
なお、本明細書では、実施例に後述した測定方法でアルミニウム元素量を測定していることからも分かるように、この指標は、アルミニウム元素量に基づき、アルミニウム系異物量を相対的に評価するものであり、ポリエステル樹脂中に含まれるアルミニウム系異物量の絶対値を示すものではない。
ポリエステル樹脂(A)とポリエステル樹脂(B)を質量比で5:95~95:5で混合してポリエステル樹脂組成物(C)を製造することが好ましい。すなわち、ポリエステル樹脂組成物(C)において、ポリエステル樹脂(A)及びポリエステル樹脂(B)の合計100質量部に対してポリエステル樹脂(A)が5~95質量部であることが好ましい。上記範囲内とすることによりポリエステル樹脂組成物(C)の着色や分子量の低下を抑制できる。なお、本明細書での着色の抑制とはリサイクル回数を重ねた(再練りを繰り返した)場合であっても後述のL値の低下や後述のb値の上昇を抑制することを指す。ポリエステル樹脂(A)の配合割合が95質量部を超えた場合は、ポリエステル樹脂組成物(C)の固有粘度保持率が低くなり、リサイクル性が不十分となるおそれがある。一方、ポリエステル樹脂(A)の配合割合が5質量部未満の場合は、着色の抑制効果が飽和する上に経済性が低下するおそれがある。なお、ポリエステル樹脂(B)は、アルミニウム化合物とリン化合物とからなる重合触媒を用いて製造されているため、アルミニウム元素に対するリン元素の残存モル比を上記の所定の範囲内とした場合であってもアンチモン触媒などの触媒を用いて製造されてなるポリエステル樹脂と比べて触媒のコストが高く(製造コストが高く)なっているが、ポリエステル樹脂(A)とポリエステル樹脂(B)とを併用することにより製造コストを抑えつつ、リサイクル性も高めることができる。本発明では、できるだけポリエステル樹脂(B)の製造コストを低減している。ポリエステル樹脂(A)の配合割合を高くすると、ポリエステル樹脂組成物(C)の製造コストは抑えることができるが、リサイクル回数を重ねると色調が悪化しやすくなる。一方、ポリエステル樹脂(B)の配合割合を高めるとポリエステル樹脂組成物(C)のリサイクル回数を重ねた場合であっても色調の悪化は抑制できるが、製造コストは高くなるおそれがある。ポリエステル樹脂(A)とポリエステル樹脂(B)の質量比は20:80~80:20であることがより好ましく、25:75~75:25であることがさらに好ましい。
中空成形体(D)の製造方法としては、特に限定されないが、例えば、ポリエステル樹脂組成物(C)を溶融成形等の方法で成形して中空成形体(D)を製造する方法(混錬経由法)やポリエステル樹脂(A)とポリエステル樹脂(B)とをドライブレンド等によりブレンドしたブレンド物を中空成形体製造装置に直接供給して成形して中空成形体(D)を製造する方法(直接成形法)などが挙げられる。
次に、ポリエステル樹脂(B)の製造方法について説明する。ポリエステル樹脂(B)の製造方法としては、触媒としてアルミニウム化合物およびリン化合物からなるポリエステル重合触媒を用いる点以外は公知の工程を備えた方法で行うことができるが、下記(4)と(5)とを満足するように重合触媒を添加することが好ましく、下記(4)と(5)に加えて下記(6)も満足するように重合触媒を添加することがさらに好ましい。なお、下記(4)~(6)の好適な数値範囲については上述している。
(4)前記ポリエステル樹脂(B)中におけるアルミニウム元素の含有量が9~20質量ppm
(5)前記ポリエステル樹脂(B)中におけるリン元素の含有量が13~31質量ppm
(6)前記ポリエステル樹脂(B)中におけるアルミニウム元素に対するリン元素の残存モル比が1.32以上1.80以下
(7)生成するポリエステル樹脂(B)に対するアルミニウム元素の添加量が9~20質量ppm(より好ましくは9~19質量ppm、さらに好ましくは10~17質量ppm、特に好ましくは12~17質量ppm)
(8)生成するポリエステル樹脂(B)に対するリン元素の添加量が20~40質量ppm(より好ましくは20~38質量ppm、さらに好ましくは21~36質量ppm)
(9)前記(7)におけるアルミニウム元素の添加量に対する前記(8)におけるリン元素の添加量のモル比(以下、「アルミニウム元素に対するリン元素の添加モル比」という)が1.50以上2.50以下(より好ましくは1.50~2.30、さらに好ましくは1.60~2.20)
固有粘度を増大させるために溶融重合法で製造されたポリエステル樹脂を固相重合してもよい。固相重合は、バッチ式重合法であっても、連続重合法であってもよいが、固相重合は、溶融重合と同様に連続式装置で行うことが好ましい。
なお、反応容器に添加する場合には、反応容器の撹拌を高くすることが好ましい。反応容器間の配管に添加する場合には、インラインミキサーなどを設置して、添加された触媒溶液が速やかに均一混合されるようにすることが好ましい。
アルミニウム化合物を溶解した溶液Sとリン化合物を溶解した溶液Tとを別々に添加した場合、アルミニウム化合物に起因する異物が多く発生しやすく、昇温結晶化温度が低くなったり、降温結晶化温度が高くなったり、十分な触媒活性が得られなくなる場合がある。アルミニウム化合物とリン化合物を同時に添加することで、重合活性をもたらすアルミニウム化合物とリン化合物の複合体が速やかに無駄なく生成できるが、別々に添加した場合には、アルミニウム化合物とリン化合物の複合体の生成が不十分であり、また、リン化合物との複合体を生成できなかったアルミニウム化合物が異物として析出するおそれがある。
また、アルミニウム化合物を溶解した溶液Sとリン化合物を溶解した溶液Tとは、重合反応の開始前であり、かつ、エステル化反応またはエステル交換反応終了後に添加することが好ましく、前記第1ステップ後であって前記第2ステップの前に前記中間体にアルミニウム化合物を溶解した溶液Sとリン化合物を溶解した溶液Tを添加することがより好ましい。エステル化反応またはエステル交換反応終了前に添加すると、アルミニウム系異物量が増大するおそれがある。
また、ポリエステル樹脂(B)の製造に使用するリン化合物は溶媒中で熱処理されたものであることが好ましい。使用する溶媒としては、水およびアルキレングリコールからなる群から選ばれる少なくとも1種であれば限定されないが、アルキレングリコールとしては、リン化合物を溶解する溶媒を用いることが好ましく、エチレングリコール等のポリエステル樹脂(B)の構成成分であるグリコールを用いることがより好ましい。溶媒中での加熱処理は、リン化合物を溶解してから行うのが好ましいが、完全に溶解していなくてもよい。
(1)固有粘度(IV)
試料またはそのプリフォームを約3g凍結粉砕して140℃15分間乾燥した後、0.20g計量し、1,1,2,2-テトラクロロエタンとp-クロロフェノールとを1:3(質量比)で混ぜた混合溶媒を用いて20mlの溶液とし、100℃で60分間撹拌して完全に溶解して室温まで冷却した後グラスフィルターを通して試料とした。30℃に温調されたウベローデ粘度計((株)離合社製)を用いて試料および溶媒の落下時間を計測し、次式により固有粘度[η]を求めた。
[η]=(-1+√(1+4K’ηSp))/2K’C
ηSp=(τ-τ0)τ0
ここで、
[η]:固有粘度(dl/g)
ηSp:比粘度(-)
K’:ハギンスの恒数(=0.33)
C:濃度(=1g/dl)
τ:試料の落下時間(sec)
τ0:溶媒の落下時間(sec)
白金製るつぼに後述するポリエステル樹脂(A-1)を秤量し、電気コンロでの炭化の後、マッフル炉で550℃、8時間の条件で灰化した。灰化後のサンプルを1.2M塩酸に溶解し、試料溶液とした。調製した試料溶液を下記の条件で測定し、高周波誘導結合プラズマ発光分析法によりポリエステル樹脂(A-1)中におけるアンチモン元素、ゲルマニウム元素、及びチタン元素の濃度を求めた。同様に後述するポリエステル樹脂(E)~(G)中におけるアンチモン元素、ゲルマニウム元素、及びチタン元素の濃度を求めたが、含有量が1質量ppm以下である元素については記載を省略した。また、上記と同様の方法で後述するポリエステル樹脂(B)中におけるアルミニウム元素の濃度を求めた。
装置:SPECTRO社製 CIROS-120
プラズマ出力:1400W
プラズマガス:13.0L/min
補助ガス:2.0L/min
ネブライザー:クロスフローネブライザー
チャンバー:サイクロンチャンバー
測定波長:167.078nm
ポリエステル樹脂(B)を硫酸、硝酸、過塩素酸で湿式分解を行った後、アンモニア水で中和した。調整した溶液にモリブデン酸アンモニウムおよび硫酸ヒドラジンを加えた後、紫外可視吸光光度計(島津製作所社製、UV-1700)を用いて、波長830nmでの吸光度を測定した。あらかじめ作製した検量線から、ポリエステル樹脂(B)中のリン元素の濃度を求めた。
ポリエステル樹脂(B)30gおよびp-クロロフェノール/テトラクロロエタン(3/1:質量比)混合溶液250mLを、撹拌子を入れた500mL三角フラスコに投入し、ホットスターラーを使用して100~105℃、1.5時間で加熱溶解した。該溶液を、直径47mm/孔径1.0μmのポリテトラフルオロエチレン製のメンブレンフィルター(Advantec社製PTFEメンブレンフィルター、品名:T100A047A)を用いて、異物を濾別した。有効濾過直径は37.5mmとした。濾過終了後、引き続きクロロホルム50mLを用いて洗浄し、次いでフィルターを乾燥させた。
該メンブレンフィルターの濾過面を、走査型蛍光X線分析装置(RIGAKU社製、ZSX100e、Rhライン球4.0kW)でアルミニウム元素量を定量した。定量はメンブレンフィルターの中心部直径30mmの部分について行った。なお、該蛍光X線分析法の検量線はアルミニウム元素含有率が既知のポリエチレンテレフタレート樹脂を用いて求め、見掛けのアルミニウム元素量をppmで表示した。測定はX線出力50kV-70mAで分光結晶としてペンタエリスリトール、検出器としてPC(プロポーショナルカウンター)を用い、PHA(波高分析器)100-300の条件でAl-Kα線強度を測定することにより実施した。検量線用ポリエチレンテレフタレート樹脂中のアルミニウム元素量は、高周波誘導結合プラズマ発光分析法で定量した。
試料420mgをヘキサフルオロイソプロパノールと重ベンゼンとを1:1(質量比)で混ぜた混合溶媒2.7mLに溶解し、リン酸25%重アセトン溶液を10μL添加して遠心分離を行った。その後、上澄み液にトリフルオロ酢酸100~150mgを添加し、すぐに下記の条件でP-NMR測定を行った。
装置:フーリエ変換核磁気共鳴装置(BRUKER製、AVANCE500)
31P共鳴周波数:202.456MHz
ロック溶媒:重ベンゼン
検出パルスのフリップ角:65°
データ取り込み時間:1.5秒
遅延時間:0.5秒
プロトンデカップリング:フルデカップル
測定温度:25~35℃
積算回数:20000~30000回程度
表1に示した化式番号残基のピーク波長を以下に示す。これらのピーク波長が検出されたときには、試料中にヒンダードフェノール構造を有すると判断した。
化学式1:34.5ppm、化学式4:30.5ppm、化学式7:53.6ppm
化学式2:33.8ppm、化学式5:30.1ppm、化学式8:53.0ppm
化学式3:31.9ppm、化学式6:28.7ppm、化学式9:51.3ppm
試料を冷凍粉砕あるいは細片化し、試料100mgを精秤した。これを、ヘキサフルオロイソプロパノ-ル/クロロホルム混合液(容量比=2/3)3mLに溶解し、さらにクロロホルム20mLを加えて希釈した。これにメタノ-ル10mLを加えてポリマーを沈殿させた後、濾過した。濾液を蒸発乾固し、ジメチルホルムアミド10mLで定容とした。次いで下記の高速液体クロマトグラフ法でポリエステル樹脂中あるいは中空成形体中の環状三量体量を定量した。前記操作を5回繰返し、その平均値をCT含有量とした。
装置:L-7000(日立製作所製)
カラム:μ-Bondasphere C18 5μ 100オングストローム 3.9mm×15cm(Waters製)
溶媒:溶離液A:2%酢酸/水(v/v)
溶離液B:アセトニトリル
グラジエントB%:10→100%(0→55分)
流速:0.8mL/分
温度:30℃
検出器:UV-259nm
試料を真空乾燥140℃、16時間乾燥し、水分率150ppm以下の乾燥ポリエステルを作製した。この乾燥ポリエステルを用いて以下の条件で二軸押出機にて再練り処理を1回行った後に再練り品の固有粘度を測定し、下記の式を用いて固有粘度保持率を算出した。また、上記乾燥ポリエステル樹脂を用いて以下の条件で二軸押出機にて再練り処理を3回行った後に再練り品の固有粘度を測定し、下記の式を用いて固有粘度保持率を算出した。なお、固有粘度の測定方法は上記(1)に記載のとおりである。
二軸押出機:テクノベル社製KZW15TW-45/60MG-NH(-2200)
設定温度:260℃(実温268~270℃)
スクリュー回転数:200rpm
吐出量1.7~2.0kg/h
固有粘度保持率(%)=100×再練り品の固有粘度/試料の固有粘度
なお、水分率は、電量滴定法であるカールフィッシャー水分計(株式会社三菱ケミカルアナリテック製、CA-200)を用いて、試料0.6gを230℃,5分間、250mL/minの窒素気流下の条件で測定した。
試料の非晶ペレットを測定セルに詰め込み(約50g)回転させながら測定を実施した。
装置:東京電色社製 精密型分光光度色彩計TC-1500SX
測定方法:JIS Z8722準拠 透過光 0度、-0度法
検出素子:シリコンフォトダイオードアレー
光源:ハロゲンランプ 12V100W 2000H
測定面積:透過25mmφ
湿温度条件:25℃、RH50%
測定セル:φ35mm、高さ25mm 回転式(ペレット)
測定内容:X,Y,Z3刺激値 CIE色度座標 x=X/X+Y+Z y=Y/X+Y+Z
ハンターLab表色系
上記(7)と同じ方法で再練り処理を行い、再練り処理を1回行った後の再練り品におけるL値及びb値と、再練り処理を3回行った後の再練り品におけるL値及びb値とを求めた。
ポリエステル樹脂(A-1)20mgを重ヘキサフルオロイソプロパノールと重クロロホルムとを1:9(容量比)で混ぜた混合溶媒0.6mlに溶解し、遠心分離を行った。その後、上澄み液を採取し、下記の条件で1H-NMR測定を行った。
装置:フーリエ変換核磁気共鳴装置(BRUKER製、AVANCE NEO600)
1H共鳴周波数:600.13MHz
ロック溶媒:重クロロホルム
フリップ角:30°
データ取り込み時間:4秒
遅延時間:1秒
測定温度:30℃
積算回数:128回
塩基性酢酸アルミニウムの20g/L水溶液に対して、等量(容量比)のエチレングリコールをともに調合タンクに仕込み、室温(23℃)で数時間撹拌した後、減圧(3kPa)下、50~90℃で数時間撹拌しながら系から水を留去し、アルミニウム化合物が20g/L含まれたアルミニウム含有エチレングリコール溶液sを調製した。
リン化合物として、Irganox1222(ビーエーエスエフ社製)を、エチレングリコールとともに調合タンクに仕込み、窒素置換下撹拌しながら175℃で150分熱処理し、リン化合物が50g/L含まれたリン含有エチレングリコール溶液tを調製した。
ポリエステル樹脂(B’-1)(参考例のためのポリエステル樹脂であり、従来、最適と考えられていたアルミニウム元素の残存量、リン元素の残存量である)
撹拌機付き10Lステンレス製オートクレーブに、事前に調合した高純度テレフタル酸とエチレングリコールからなるエステル化率が約95%のポリエステルオリゴマーと、高純度テレフタル酸を仕込み、260℃でエステル化反応を行って、オリゴマー混合物を得た。得られたオリゴマー混合物は酸末端基の濃度が750eq/tonであり、水酸基末端の割合(OH%)は59モル%であった。
得られたオリゴマー混合物に、上記方法で調製したアルミニウム含有エチレングリコール溶液sおよびリン含有エチレングリコール溶液tを混合し一液化した混合液を添加した。該混合液は、それぞれオリゴマー混合物の質量に対して、アルミニウム元素およびリン元素として21質量ppmおよび58質量ppmとなるように作製した。アルミニウム元素に対するリン元素の添加モル比は2.41であった。なお、生成されるポリエステル樹脂の量は、添加するテレフタル酸の量より算出可能であり、本実施例では、生成されるポリエステル樹脂に対してアルミニウム元素およびリン元素として21質量ppmおよび58質量ppmとなるように混合液が添加されている。
その後、1時間で系の温度を280℃まで昇温して、この間に系の圧力を徐々に減じて0.15kPaとし、この条件下で重縮合反応を行い、IVが0.60dl/gのポリエステル樹脂を得た。その後、得られたポリエステル樹脂を、バッチ式の固相重合装置を使用し、230℃にて、減圧下、7時間固相重合し、固有粘度が0.70dl/gのポリエステル樹脂(B’-1)を得た。ポリエステル樹脂(B’-1)におけるアルミニウム元素の残存量は21質量ppm、リン元素の残存量は45質量ppm、アルミニウム元素に対するリン元素の残存モル比は1.87であった。ポリエステル樹脂(B’-1)中におけるアルミニウム系異物に相当するアルミニウム元素の含有率は710質量ppm、ポリエステル樹脂(B’-1)のL値は58.7であり、ポリエステル樹脂(B’-1)中にヒンダードフェノール構造を有することが確認できた。
アルミニウム元素およびリン元素としての添加量が異なる以外は、ポリエステル樹脂(B’-1)と同様の方法で、ポリエステル樹脂(B-1)を得た。ポリエステル樹脂(B-1)におけるアルミニウム元素の残存量は16質量ppm、リン元素の残存量は26質量ppm、アルミニウム元素に対するリン元素の残存モル比は1.42であった。ポリエステル樹脂(B-1)中におけるアルミニウム系異物に相当するアルミニウム元素の含有率は2000質量ppm、ポリエステル樹脂(B-1)のL値は58.5であり、ポリエステル樹脂(B-1)中にヒンダードフェノール構造を有することが確認できた。
アルミニウム元素およびリン元素としての添加量が異なる以外は、ポリエステル樹脂(B’-1)と同様の方法で、ポリエステル樹脂(B-2)を得た。ポリエステル樹脂(B-2)におけるアルミニウム元素の残存量は10質量ppm、リン元素の残存量は16質量ppm、アルミニウム元素に対するリン元素の残存モル比は1.39であった。ポリエステル樹脂(B-2)中におけるアルミニウム系異物に相当するアルミニウム元素の含有率は2300質量ppm、ポリエステル樹脂(B-2)のL値は56.6であり、ポリエステル樹脂(B-2)中にヒンダードフェノール構造を有することが確認できた。
ポリエステル樹脂(A-1)として、協栄産業株式会社より提供された回収ポリエステル樹脂フレークを用いた。該回収ポリエステル樹脂フレークは、組成分析の結果、エチレンテレフタレート構造単位を97モル%以上含むことを確認した。該回収ポリエステル樹脂フレークの固有粘度は0.750dl/gであった。また、上記回収ポリエステル樹脂フレーク中におけるアンチモン元素の含有率は190質量ppm、ゲルマニウム元素の含有率は1.6質量ppmであった。なお、チタン元素の含有率は1質量ppm以下と非常に少量であるため、表2及び表3ではチタン元素の含有率の記載は省略した。アンチモン、ゲルマニウム、チタンの各元素の含有率から、上記回収ポリエステル樹脂フレークは、アンチモン触媒で製造されたポリエステル樹脂を用いた中空成形体を主体とした回収ポリエステル樹脂フレークであることを裏付けることができた。
ポリエステル樹脂(A-1)とポリエステル樹脂(B)とを表2、3に示した配合比で溶融混練することでポリエステル樹脂組成物を得ることができた。ポリエステル樹脂組成物の各種特性を表2、3に示す。
ポリエステル樹脂(A-1)、ポリエステル樹脂(B-1)、ポリエステル樹脂(B-2)、及び下記ポリエステル樹脂(E)~(G)単体の各種特性を表3に示す。なお、ポリエステル樹脂(E)~(G)はアンチモン触媒、チタン触媒、及びゲルマニウム触媒の少なくとも一つを用いて作製されたポリエステル樹脂であり、アンチモン、チタン、ゲルマニウムの各元素の含有率は上記の測定方法で測定されている。
ポリエステル樹脂(E):インドラマ社製N1(アンチモン元素の含有量:270質量ppm、固有粘度:0.789dl/g)
ポリエステル樹脂(F):インドラマ社製H0AF(チタン元素の含有量:7質量ppm、固有粘度:0.753dl/g)
ポリエステル樹脂(G):インドラマ社製N2G(ゲルマニウム元素の含有量:30質量ppm、固有粘度:0.739dl/g)
ポリエステル樹脂(A-1)とポリエステル樹脂(E)~(G)のいずれかとを表3に示した配合比で溶融混練することでポリエステル樹脂組成物を得ることができた。ポリエステル樹脂組成物の各種特性を表3に示す。
また、ポリエステル樹脂組成物(C)や中空成形体(D)は再使用することが出来るので、資源枯渇の抑制、海洋ごみの減少、地球温暖化の抑制など様々な課題解決に寄与することができる。
以上から明らかなように、本開示に係る第一の態様のポリエステル樹脂組成物(C)の製造方法は、回収されたポリエステル樹脂(A)とアルミニウム化合物及びリン化合物を含むポリエステル樹脂(B)とを混合する工程を含み、前記ポリエステル樹脂(A)は下記(1)~(3)を満足し、前記ポリエステル樹脂(B)は下記(4)~(6)を満足する。
(1)前記ポリエステル樹脂(A)はアンチモン、チタン、及びゲルマニウムから選ばれる少なくとも一種の元素を含む
(2)前記ポリエステル樹脂(A)中におけるアンチモン元素、チタン元素、及びゲルマニウム元素の合計の含有量が2~500質量ppmである
(3)前記ポリエステル樹脂(A)の固有粘度が0.5~0.8dl/gである
(4)前記ポリエステル樹脂(B)中におけるアルミニウム元素の含有量が9~20質量ppmである
(5)前記ポリエステル樹脂(B)中におけるリン元素の含有量が13~31質量ppmである
(6)前記ポリエステル樹脂(B)中におけるアルミニウム元素に対するリン元素の残存モル比が1.32以上1.80以下である
前記ポリエステル樹脂(B)の固有粘度が0.56dl/g以上である。
前記ポリエステル樹脂(A)及び前記ポリエステル樹脂(B)の合計100質量部に対し、前記ポリエステル樹脂(A)が5~95質量部である。
(1)前記ポリエステル樹脂(A)はアンチモン、チタン、及びゲルマニウムから選ばれる少なくとも一種の元素を含む
(2)前記ポリエステル樹脂(A)中におけるアンチモン元素、チタン元素、及びゲルマニウム元素の合計の含有量が2~500質量ppmである
(3)前記ポリエステル樹脂(A)の固有粘度が0.5~0.8dl/gである
(4)前記ポリエステル樹脂(B)中におけるアルミニウム元素の含有量が9~20質量ppmである
(5)前記ポリエステル樹脂(B)中におけるリン元素の含有量が13~31質量ppmである
(6)前記ポリエステル樹脂(B)中におけるアルミニウム元素に対するリン元素の残存モル比が1.32以上1.80以下である
(1)前記ポリエステル樹脂(A)はアンチモン、チタン、及びゲルマニウムから選ばれる少なくとも一種の元素を含む
(2)前記ポリエステル樹脂(A)中におけるアンチモン元素、チタン元素、及びゲルマニウム元素の合計の含有量が2~500質量ppmである
(3)前記ポリエステル樹脂(A)の固有粘度が0.5~0.8dl/gである
(4)前記ポリエステル樹脂(B)中におけるアルミニウム元素の含有量が9~20質量ppmである
(5)前記ポリエステル樹脂(B)中におけるリン元素の含有量が13~31質量ppmである
(6)前記ポリエステル樹脂(B)中におけるアルミニウム元素に対するリン元素の残存モル比が1.32以上1.80以下である
Claims (14)
- 回収されたポリエステル樹脂(A)とアルミニウム化合物及びリン化合物を含むポリエステル樹脂(B)とを混合する工程を含み、前記ポリエステル樹脂(A)は下記(1)~(3)を満足し、前記ポリエステル樹脂(B)は下記(4)~(6)を満足することを特徴とするポリエステル樹脂組成物(C)の製造方法。
(1)前記ポリエステル樹脂(A)はアンチモン、チタン、及びゲルマニウムから選ばれる少なくとも一種の元素を含む
(2)前記ポリエステル樹脂(A)中におけるアンチモン元素、チタン元素、及びゲルマニウム元素の合計の含有量が2~500質量ppm
(3)前記ポリエステル樹脂(A)の固有粘度が0.5~0.8dl/g
(4)前記ポリエステル樹脂(B)中におけるアルミニウム元素の含有量が9~20質量ppm
(5)前記ポリエステル樹脂(B)中におけるリン元素の含有量が13~31質量ppm
(6)前記ポリエステル樹脂(B)中におけるアルミニウム元素に対するリン元素の残存モル比が1.32以上1.80以下 - 前記ポリエステル樹脂(B)の固有粘度が0.56dl/g以上である請求項1に記載のポリエステル樹脂組成物(C)の製造方法。
- リン化合物が3,5-ジ-tert-ブチル-4-ヒドロキシベンジルホスホン酸ジアルキルエステルである請求項1に記載のポリエステル樹脂組成物(C)の製造方法。
- 前記ポリエステル樹脂(A)及び前記ポリエステル樹脂(B)の合計100質量部に対し、前記ポリエステル樹脂(A)が5~95質量部である請求項1に記載のポリエステル樹脂組成物(C)の製造方法。
- 請求項1~4のいずれか1項に記載の製造方法で製造されたポリエステル樹脂組成物(C)を溶融成形する工程を含む中空成形体(D)の製造方法。
- 回収されたポリエステル樹脂(A)とアルミニウム化合物及びリン化合物を含むポリエステル樹脂(B)とを混合することによるポリエステル樹脂(A)の再生方法であって、前記ポリエステル樹脂(A)は下記(1)~(3)を満足し、前記ポリエステル樹脂(B)は下記(4)~(6)を満足することを特徴とするポリエステル樹脂(A)の再生方法。
(1)前記ポリエステル樹脂(A)はアンチモン、チタン、及びゲルマニウムから選ばれる少なくとも一種の元素を含む
(2)前記ポリエステル樹脂(A)中におけるアンチモン元素、チタン元素、及びゲルマニウム元素の合計の含有量が2~500質量ppm
(3)前記ポリエステル樹脂(A)の固有粘度が0.5~0.8dl/g
(4)前記ポリエステル樹脂(B)中におけるアルミニウム元素の含有量が9~20質量ppm
(5)前記ポリエステル樹脂(B)中におけるリン元素の含有量が13~31質量ppm
(6)前記ポリエステル樹脂(B)中におけるアルミニウム元素に対するリン元素の残存モル比が1.32以上1.80以下 - 前記ポリエステル樹脂(B)の固有粘度が0.56dl/g以上である請求項6に記載のポリエステル樹脂(A)の再生方法。
- リン化合物が3,5-ジ-tert-ブチル-4-ヒドロキシベンジルホスホン酸ジアルキルエステルである請求項6に記載のポリエステル樹脂(A)の再生方法。
- 前記ポリエステル樹脂(A)及び前記ポリエステル樹脂(B)の合計100質量部に対し、前記ポリエステル樹脂(A)が5~95質量部である請求項6に記載のポリエステル樹脂(A)の再生方法。
- 回収されたポリエステル樹脂(A)とアルミニウム化合物及びリン化合物を含むポリエステル樹脂(B)との混合物であるポリエステル樹脂組成物(C)であって、前記ポリエステル樹脂(A)は下記(1)~(3)を満足し、前記ポリエステル樹脂(B)は下記(4)~(6)を満足することを特徴とするポリエステル樹脂組成物(C)。
(1)前記ポリエステル樹脂(A)はアンチモン、チタン、及びゲルマニウムから選ばれる少なくとも一種の元素を含む
(2)前記ポリエステル樹脂(A)中におけるアンチモン元素、チタン元素、及びゲルマニウム元素の合計の含有量が2~500質量ppm
(3)前記ポリエステル樹脂(A)の固有粘度が0.5~0.8dl/g
(4)前記ポリエステル樹脂(B)中におけるアルミニウム元素の含有量が9~20質量ppm
(5)前記ポリエステル樹脂(B)中におけるリン元素の含有量が13~31質量ppm
(6)前記ポリエステル樹脂(B)中におけるアルミニウム元素に対するリン元素の残存モル比が1.32以上1.80以下 - 前記ポリエステル樹脂(B)の固有粘度が0.56dl/g以上である請求項10に記載のポリエステル樹脂組成物(C)。
- リン化合物が3,5-ジ-tert-ブチル-4-ヒドロキシベンジルホスホン酸ジアルキルエステルである請求項10に記載のポリエステル樹脂組成物(C)。
- 前記ポリエステル樹脂(A)及び前記ポリエステル樹脂(B)の合計100質量部に対し、前記ポリエステル樹脂(A)が5~95質量部である請求項10記載のポリエステル樹脂組成物(C)。
- 請求項10~13のいずれか1項に記載のポリエステル樹脂組成物(C)から形成された中空成形体(D)。
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JP2003301038A (ja) * | 2002-02-05 | 2003-10-21 | Toyobo Co Ltd | ポリエステル並びにそれからなる中空成形体、シ−ト状物及び延伸フイルム |
JP2006169432A (ja) | 2004-12-17 | 2006-06-29 | Toyobo Co Ltd | ポリエステルならびにポリエステルの製造方法 |
WO2007032325A1 (ja) | 2005-09-14 | 2007-03-22 | Toyo Boseki Kabushiki Kaisha | ポリエステルおよびポリエステルの製造方法、ならびにポリエステル成形体 |
WO2013154043A1 (ja) | 2012-04-11 | 2013-10-17 | 東洋紡株式会社 | ポリエステル中空成形体およびポリエステル中空成形体を成形する方法 |
WO2013154042A1 (ja) | 2012-04-11 | 2013-10-17 | 東洋紡株式会社 | ポリエステル中空成形体およびポリエステル中空成形体を成形する方法 |
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Patent Citations (7)
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JP2002322254A (ja) * | 2001-02-20 | 2002-11-08 | Toyobo Co Ltd | ポリエステルおよびその製造方法 |
JP2002249650A (ja) * | 2001-02-23 | 2002-09-06 | Toyobo Co Ltd | ポリエステル組成物、中空成形体、および、シート状物質 |
JP2003301038A (ja) * | 2002-02-05 | 2003-10-21 | Toyobo Co Ltd | ポリエステル並びにそれからなる中空成形体、シ−ト状物及び延伸フイルム |
JP2006169432A (ja) | 2004-12-17 | 2006-06-29 | Toyobo Co Ltd | ポリエステルならびにポリエステルの製造方法 |
WO2007032325A1 (ja) | 2005-09-14 | 2007-03-22 | Toyo Boseki Kabushiki Kaisha | ポリエステルおよびポリエステルの製造方法、ならびにポリエステル成形体 |
WO2013154043A1 (ja) | 2012-04-11 | 2013-10-17 | 東洋紡株式会社 | ポリエステル中空成形体およびポリエステル中空成形体を成形する方法 |
WO2013154042A1 (ja) | 2012-04-11 | 2013-10-17 | 東洋紡株式会社 | ポリエステル中空成形体およびポリエステル中空成形体を成形する方法 |
Cited By (1)
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WO2023182131A1 (ja) * | 2022-03-25 | 2023-09-28 | 東洋紡株式会社 | 回収ポリエステル樹脂を用いたポリエステルフィルムの製造方法およびポリエステルフィルム |
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CN117545804A (zh) | 2024-02-09 |
TW202309138A (zh) | 2023-03-01 |
KR20240023168A (ko) | 2024-02-20 |
JPWO2022270505A1 (ja) | 2022-12-29 |
US20240309202A1 (en) | 2024-09-19 |
TWI818595B (zh) | 2023-10-11 |
EP4361218A1 (en) | 2024-05-01 |
JP7521601B2 (ja) | 2024-07-24 |
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