WO2021172349A1 - 異物の少ないポリエステル樹脂およびこれを用いた塗料組成物または接着剤組成物 - Google Patents
異物の少ないポリエステル樹脂およびこれを用いた塗料組成物または接着剤組成物 Download PDFInfo
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- WO2021172349A1 WO2021172349A1 PCT/JP2021/006846 JP2021006846W WO2021172349A1 WO 2021172349 A1 WO2021172349 A1 WO 2021172349A1 JP 2021006846 W JP2021006846 W JP 2021006846W WO 2021172349 A1 WO2021172349 A1 WO 2021172349A1
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- WIPO (PCT)
- Prior art keywords
- polyester resin
- acid
- titanium
- zinc
- mass
- Prior art date
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- 239000004645 polyester resin Substances 0.000 title claims abstract description 127
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- 229910052719 titanium Inorganic materials 0.000 claims abstract description 39
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- SRPWOOOHEPICQU-UHFFFAOYSA-N trimellitic anhydride Chemical compound OC(=O)C1=CC=C2C(=O)OC(=O)C2=C1 SRPWOOOHEPICQU-UHFFFAOYSA-N 0.000 claims description 17
- 239000012948 isocyanate Substances 0.000 claims description 15
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- 230000032050 esterification Effects 0.000 description 16
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- ARCGXLSVLAOJQL-UHFFFAOYSA-N trimellitic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C(C(O)=O)=C1 ARCGXLSVLAOJQL-UHFFFAOYSA-N 0.000 description 16
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- 229910002651 NO3 Inorganic materials 0.000 description 4
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- 230000014759 maintenance of location Effects 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 150000003752 zinc compounds Chemical class 0.000 description 4
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 4
- WBIQQQGBSDOWNP-UHFFFAOYSA-N 2-dodecylbenzenesulfonic acid Chemical compound CCCCCCCCCCCCC1=CC=CC=C1S(O)(=O)=O WBIQQQGBSDOWNP-UHFFFAOYSA-N 0.000 description 3
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Images
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
- C09D167/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/06—Polyurethanes from polyesters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J167/00—Adhesives based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Adhesives based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J167/00—Adhesives based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Adhesives based on derivatives of such polymers
- C09J167/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- 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
- C08G2150/00—Compositions for coatings
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- 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
- C08G2170/00—Compositions for adhesives
Definitions
- the present invention relates to a polyester resin having few foreign substances and a coating composition or an adhesive composition using the polyester resin. More specifically, the present invention relates to a dry laminate adhesive for a metal base material, a paint for a precoated metal, and a polyester resin suitable for a can paint.
- a titanium compound or a zinc compound has been used as a catalyst for industrially producing a polyester resin from a dicarboxylic acid or an ester-forming derivative thereof and a diol component (for example, Patent Documents 1 and 2).
- Patent Documents 1 and 2 Conventionally, a titanium compound or a zinc compound has been used as a catalyst for industrially producing a polyester resin from a dicarboxylic acid or an ester-forming derivative thereof and a diol component.
- Patent Documents 1 and 2 a diol component
- Patent Document 3 gelation can be suppressed in the reaction step by limiting the addition amounts of the titanium and zinc catalysts, low molecular weight substances can be efficiently polycondensed without scattering during polycondensation, and thermal stability can be further achieved.
- a technique is disclosed that can produce a polyester excellent in (suppression of black foreign matter and gelation).
- Patent Document 3 does not consider the zinc salt generated by reacting with the raw material carboxylic acid as a foreign substance, and when the polyester resin is dissolved in a solvent or dispersed in water, the zinc-derived foreign substance is regarded as an insoluble substance. There was a problem of precipitation. More specifically, when foreign matter is deposited, defects derived from the foreign matter occur during varnish coating. For example, in the case of pre-coated metal and can paint, the appearance of the coating film is poor, and in the case of dry laminate adhesive for metal base material, it is with the base material. There was a problem that poor adhesion occurred.
- an object of the present invention is to provide a polyester resin having good productivity and color tone, few foreign substances, and good adhesion to a metal substrate and good curability.
- the present inventors have completed the present invention as a result of diligent research to solve the above problems. That is, the present invention has the following configuration.
- the foreign substance preferably contains a zinc salt of a polyvalent carboxylic acid.
- the reduced viscosity of the polyester resin is preferably 0.10 dl / g or more, and the acid value is preferably 50 eq / t or more. Further, the content of trimellitic anhydride in the polyester resin is preferably 1000 mass ppm or less.
- a method for producing the polyester resin which is obtained by producing a prepolymer in the presence of a titanium catalyst and in the absence of a zinc catalyst, and then polycondensing in the presence of a titanium catalyst and a zinc catalyst.
- FIG. 1 is a scanning electron microscope (SEM) photograph of a foreign substance contained in a polyester resin.
- the polyester resin of the present invention is essential to contain titanium in an amount of 2% by mass or more and 10% by mass or less in terms of metal. It is preferably 3% by mass or more, more preferably 4% by mass, because the productivity is high, a high molecular weight polyester resin can be easily obtained, and the solid storage stability and metal adhesion are good.
- the above is more preferably 5 mass ppm or more. Further, since the color tone of the polyester resin is good, it is preferably 9 mass ppm or less, more preferably 8 mass ppm or less, and further preferably 7 mass ppm or less.
- the polyester resin of the present invention is essential to contain zinc in an amount of 50 mass ppm or more and 100 mass ppm or less in terms of metal. Since the curability of the polyester resin, particularly the curability (reactivity) with the isocyanate curing agent, is improved, it is preferably 55 mass ppm or more, and more preferably 60 mass ppm or more. Further, it is preferably 95% by mass or less, more preferably, because it suppresses the generation of foreign matter derived from zinc, improves the color tone of the polyester resin, improves the dissolution stability, and can reduce the amount of foreign matter. Is 90 mass ppm or less.
- the polyester resin of the present invention preferably has an antimony content of 10 mass ppm or less in terms of metal.
- the amount is preferably less, preferably 5 mass ppm or less, more preferably 1 mass ppm or less, and further preferably 0 ppm.
- the titanium content and zinc content in the polyester resin shall be the values analyzed by the dry ashing / acid decomposition method, and the antimony content shall be the values analyzed by the ittrium nitrate method (nitrate ashing method).
- Titanium and zinc contained in the polyester resin may be contained as a single metal or as a compound. In any case, it suffices to contain a predetermined amount in terms of metal. It is preferably contained in the same composition as the catalyst for polymerizing the polyester resin.
- titanium compound examples include titanium halide compounds such as titanium tetrafluoride, titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, and hexafluorotitanate, ⁇ -titanate, ⁇ -titanate, and ammonium titanate.
- titanium halide compounds such as titanium tetrafluoride, titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, and hexafluorotitanate, ⁇ -titanate, ⁇ -titanate, and ammonium titanate.
- Titanate compounds such as sodium titanate, peroxotitanate complex, anatase, inorganic acid titanium salt compounds such as titanium sulfate, titanium nitrate, titanium phosphate, titanium silicate, tetramethyltitanium, tetraethyltitanium, tetrabenzyltitanium, tetra Titanium organic metal compounds such as phenyl titanium and bis (cyclopentadienyl) titanium dichloride, allyloxy titanium compounds such as tetraphenoxy titanium, siloxy titanium compounds such as tetrakis (trimethylsiloxy) titanium and tetrakis (triphenylsiloxy) titanium, acetic acid.
- titanium salt compounds such as titanium sulfate, titanium nitrate, titanium phosphate, titanium silicate, tetramethyltitanium, tetraethyltitanium, tetrabenzyltitanium, tetra Titanium organic
- Organic acid titanium salt compounds such as titanium, titanium propionate, titanium lactate, titanium citrate, titanium tartate, titanyl potassium oxalate, titanium organic sulfonate, titanium organic phosphonate, tetrakis (diethylamino) titanium, titanium tetrapyrrolid, etc.
- Titanium tetraalkoxides such as titanium amide compounds, titanium tetramethoxydo, titanium tetraethoxydo, titanium tetra-n-propoxide, titanium tetraisopropoxide, titanium tetra-n-butoxide, titanium tetra-2-ethylhexoxide.
- Halogen-substituted titanium alkoxides titanium acetate triisopropoxide, carboxylic acid group-substituted titanium alkoxides such as titanium methacrylate triisopropoxide, titanium tris (dioctylpyrophosphate) isopropoxide, titanium (monoethyl phosphate) triisopropoxy Phosphonic acid group substituted titanium alkoxides such as do, titanium tris (dodecylbenzene sulfonate) sulfonic acid group substituted titanium alkoxides such as isopropoxide, ammonium hexaethoxytitanate, sodium hexaethoxytitanate, potassium hexaethoxytitanate, sodium hexa-n -Alkoxy titanates such as propoxytitanate, titanium bis (2,4-pentanionate) diisop ⁇ -diketonate-substituted titanium alk
- Examples of zinc compounds include zinc alone such as zinc powder, zinc acetate, organic acid zinc salts such as acetylacetonate salt of zinc, zinc carbonate, zinc chloride, zinc nitrate, zinc phosphate, zinc sulfate, zinc borate, etc.
- examples thereof include inorganic acid zinc salts such as zinc aluminate, other organic zinc compounds such as dimethyl zinc and diethyl zinc, and other inorganic zinc compounds such as zinc oxide, zinc sulfide and zinc chloride. Of these, zinc acetate dihydrate is preferred.
- the foreign substance in the present invention contains at least a zinc salt of a polyvalent carboxylic acid.
- a zinc salt of a polyvalent carboxylic acid which is a raw material of a polyester resin, and examples thereof include a zinc salt of terephthalic acid, a zinc salt of isophthalic acid, a zinc salt of orthophthalic acid, and a zinc salt of trimellitic acid. Be done. Among them, it contains zinc salt of terephthalic acid, zinc salt of isophthalic acid, and zinc salt of trimellitic acid as main components.
- the zinc salt of the polyvalent carboxylic acid contained in the foreign substance is preferably 80% by mass or more, more preferably 90% by mass or more, and further preferably 100% by mass.
- the polyester resin of the present invention has a content of the foreign matter in 5 g of the polyester resin of 15 or less (hereinafter, also referred to as "15 / 5 g").
- the content of foreign matter is better, preferably 14 (14 / 5g) or less, more preferably 12 (12 / 5g) or less, and even more preferably 10 (10 / 5g). It is less than or equal to, more preferably 9 pieces (9 pieces / 5 g) or less, and particularly preferably 8 pieces (8 pieces / 5 g) or less.
- the lower limit is not particularly limited, and industrially, it may be 1 piece (1 piece / 5 g) or more, and 2 pieces (2 pieces / 5 g) or more may be used.
- FIG. 1 is an SEM photograph of the filter medium, and the portion marked with ⁇ is a foreign substance.
- SEM-EDX scanning electron microscope-energy dispersive X-ray spectroscopy: SEM-Energy Dispersive X-ray Spectroscopy
- the analytical means it is possible to preferably discriminate between an organic substance such as gel or an impurity derived from a metal species other than zinc and a foreign substance containing a zinc salt of a polyvalent carboxylic acid.
- the major axis of the foreign matter is preferably 5 ⁇ m or more, more preferably 8 ⁇ m or more, and further preferably 10 ⁇ m or more. Further, it is preferably 80 ⁇ m or less, more preferably 70 ⁇ m or less, and further preferably 60 ⁇ m or less.
- the polyester resin of the present invention can reduce foreign substances in the above range to 15 pieces / 5 g or less.
- polyester resin of the present invention contains less than a predetermined amount of foreign matter, defects derived from foreign matter do not occur during varnish (polyester resin composition) coating. For example, in pre-coated metal and can paint applications, poor appearance of the coating film does not occur, and as a dry laminate adhesive for a metal base material, poor adhesion to the base material does not occur.
- the polyester resin of the present invention is preferably a polyester containing a polyvalent carboxylic acid component and a polyhydric alcohol component as a copolymerization component.
- dicarboxylic acid component examples include aromatic dicarboxylic acid, aliphatic dicarboxylic acid, unsaturated aliphatic dicarboxylic acid and alicyclic dicarboxylic acid.
- Terephthalic acid isophthalic acid, orthophthalic acid, 2,6-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 5-sodium sulfoisophthalic acid, 5-lithium sulfoisophthalic acid, 2-sodium sulfoterephthalic acid, 4,4' -Diphenylmethane dicarboxylic acid, 4,4'-diphenyl ether dicarboxylic acid, 4,4'-biphenyldicarboxylic acid, 4,4'-stillbenzdicarboxylic acid, etc.
- the aliphatic dicarboxylic acid is not particularly limited, and examples thereof include pimelic acid, suberic acid, adipic acid, azelaic acid, sebacic acid, dodecanedioic acid, and dimer acid, which are used alone or in combination of two or more. be able to.
- Examples of the unsaturated aliphatic dicarboxylic acid include fumaric acid, maleic acid, itaconic acid, hexahydrophthalic acid, and tetrahydrophthalic acid.
- 1,2-cyclohexanedicarboxylic acid 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid and the like can also be used.
- aromatic dicarboxylic acids or aliphatic dicarboxylic acids are preferable.
- terephthalic acid or isophthalic acid is more preferable, and as the aliphatic dicarboxylic acid, sebacic acid is more preferable.
- the aromatic dicarboxylic acid is preferably 50 mol% or more, more preferably 60 mol% or more, still more preferably 70 mol% or more.
- the total amount of the polyvalent carboxylic acid component and the polyhydric alcohol component may exceed 200 mol%.
- the total amount of the composition excluding the component to which acid anhydride or the like is post-added (post-added) shall be calculated as 200 mol%.
- polyvalent carboxylic acid having a trivalent or higher valence examples include polyvalent carboxylic acids such as trimellitic acid, pyromellitic acid, benzophenone tetracarboxylic acid, biphenylsulfonetetracarboxylic acid, and biphenyltetracarboxylic acid, and anhydrides thereof. .. These trivalent or higher valent carboxylic acid components may be used alone or in combination of two or more. Of these, trimellitic acid or trimellitic anhydride is preferable.
- glycol component examples include aliphatic glycols, alicyclic glycols, aromatic glycols and polyalkylene glycols. Specifically, ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2-methyl-1,3 -Propanediol, 2,2-diethyl-1,3-propanezil, 2-ethyl-2-methyl-1,3-propanediol, 2-butyl-2-ethyl-1,3-propanezyl, neopentyl glycol (NPG), 3-methyl-1,5-pentanediol, 1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol,
- polyalkylene glycols such as glycols, polyethylene glycols and polypropylene glycols. These glycol components can be used alone or in combination of two or more. Of these, aliphatic glycols or alicyclic glycols are preferable. As the aliphatic glycol, ethylene glycol and neopentyl glycol are preferable, and as the alicyclic glycol, 1,4-cyclohexanedimethanol is preferable.
- trihydric or higher polyhydric alcohol component examples include glycerin, trimethylolethane, trimethylolpropane, mannitol, sorbitol, pentaerythritol, ⁇ -methylglucoside and the like. These trihydric or higher polyhydric alcohol components may be used alone or in combination of two or more.
- the aliphatic glycol is preferably 50 mol% or more, more preferably 60 mol% or more, and further preferably 65 mol% or more.
- Biomass-derived glycol can also be used as the glycol component.
- ethylene glycol or neopentyl glycol can be used without particular limitation.
- biomass-derived ethylene glycol is made from ethanol (biomass ethanol) produced from biomass as a raw material.
- biomass-derived ethylene glycol can be obtained from biomass ethanol by a method of producing ethylene glycol via ethylene oxide by a conventionally known method.
- commercially available biomass ethylene glycol may be used, for example, biomass ethylene glycol commercially available from India Glycol, and biomass neopentyl glycol commercially available from Perstoop (Neture series, N20, N40, N100). Can be preferably used.
- esterification step As a method for producing a polyester resin, it is preferable to carry out an esterification reaction (hereinafter, also referred to as an esterification step) and then a polycondensation reaction (hereinafter, also referred to as a polycondensation step). That is, in the esterification step, the above dicarboxylic acid and diol components are preferably esterified at 150 to 250 ° C. A low molecular weight prepolymer (oligomer) or the like is produced in the esterification step.
- the reaction temperature in the esterification step is more preferably 160 to 245 ° C, and even more preferably 180 to 240 ° C.
- the reaction time may be appropriately set depending on the reaction temperature, and is preferably 1 to 10 hours, more preferably 2 to 8 hours. Then, in the polycondensation step, the polycondensation reaction is carried out preferably at 230 to 300 ° C. while reducing the pressure in the system.
- the reaction temperature of the polycondensation step is more preferably 240 to 290 ° C, more preferably 250 to 280 ° C.
- the reaction time may be appropriately set depending on the reaction temperature, and is preferably 0.5 to 5 hours, more preferably 1 to 3 hours.
- the degree of decompression is preferably 10 mmHg or less, more preferably 5 mmHg or less, still more preferably 1 mmHg or less, and particularly preferably 0.5 mmHg or less.
- the lower limit is not particularly limited, and industrially, it may be 0.01 mmHg or more, and may be 0.05 mmHg or more.
- the target polyester resin can be obtained by the above manufacturing method.
- the above titanium catalyst may be present in a predetermined amount during the polycondensation step. That is, it may be added at the time of the esterification step, after the esterification step is completed, before the polycondensation step, or after the polycondensation step is started. It is preferably added during the esterification step.
- the amount of the titanium catalyst added is proportional to the titanium content contained in the produced polyester resin. Therefore, in terms of titanium metal, it is preferably 2 mass ppm or more, more preferably 3 mass ppm or more, still more preferably 4 mass ppm or more, and particularly preferably 5 mass ppm or more with respect to the polyester resin. be. Further, it is preferably 10 mass ppm or less, more preferably 9 mass ppm or less, further preferably 8 mass ppm or less, and particularly preferably 7 mass ppm or less.
- a zinc catalyst is present during the esterification step, the zinc catalyst tends to form a salt with an unreacted polyvalent carboxylic acid, and a foreign substance containing a zinc salt of the polyvalent carboxylic acid tends to be generated. That is, the formation of foreign substances can be suppressed by adding a predetermined amount during the polycondensation step.
- the amount of zinc catalyst added is proportional to the zinc content contained in the produced polyester resin. Therefore, in terms of zinc metal, it is preferably 50 mass ppm or more, more preferably 55 mass ppm or more, and further preferably 60 mass ppm or more with respect to the polyester resin. Further, it is preferably 100 mass ppm or less, more preferably 95 mass ppm or less, and further preferably 90 mass ppm or less.
- the acid value of the polyester resin is preferably 40 eq / t or more, more preferably 50 eq / t or more. Yes, more preferably 60 eq / t or more, even more preferably 70 eq / t or more, and particularly preferably 100 eq / t or more.
- the upper limit of the acid value is not particularly limited, but is preferably 400 eq / t or less, more preferably 300 eq / t or less, and even more preferably 200 eq / t or less. Within the above range, the solid storage stability (reduction viscosity retention rate) of the polyester resin is improved.
- the polyester resin of the present invention may be given an acid value by any method.
- an acid value By imparting an acid value, effects such as improvement of curability with a curing agent and improvement of adhesion with a metal material may be obtained.
- a method for imparting an acid value a depolymerization method in which a polyvalent carboxylic acid anhydride is added in the latter stage of the polycondensation step, or a polyvalent carboxylic acid is added in the prepolymer (oligoene) stage in the esterification step to increase the value.
- the latter method of increasing the acid value in the esterification step is preferable because it can reduce the amounts of unreacted trimellitic anhydride and trimellitic acid contained (residual) in the polyester resin.
- the polyester resin can have a high molecular weight without causing polymerization failure. Further, by setting the value to the upper limit or less, a prepolymer having a high acid value can be obtained, and the acid value can be imparted to the polyester resin. Further, the metal adhesion and the curability are improved.
- the amount of trimellitic anhydride component contained (residual) in the polyester resin of the present invention is preferably 1,000 mass ppm or less. Since the solution stability of the polyester resin is improved, it is more preferably 500 mass ppm or less, further preferably 100 mass ppm or less, still more preferably 50 mass ppm or less, and particularly preferably 20 mass ppm or less. Is. By setting the content to 1,000 mass ppm or less, hydrolysis of the polyester resin by acid is suppressed, and the dissolution stability of the polyester resin is improved.
- the amount of the trimellitic anhydride component contained in the polyester resin is small, the lower limit is not particularly limited, but industrially, it may be 1 mass ppm or more, or 2 mass ppm or more.
- the trimellitic anhydride component contained in the polyester resin mainly refers to the (unreacted) trimellitic anhydride component that did not react in the esterification step or the polycondensation step.
- the trimellitic anhydride component is water. It also contains trimellitic acid that just opened the ring by reacting with. That is, the trimellitic anhydride component is the total amount of trimellitic anhydride and trimellitic acid.
- the content of the trimellitic anhydride component contained in the polyester resin can be measured by HPLC.
- the reduced viscosity (symbol: ⁇ sp / c, unit: dl / g) of the polyester resin of the present invention is not particularly limited, but is preferably 0.10 dl / g or more, and more preferably 0.40 dl / g or more. When it is 0.10 dl / g or more, the strength and metal adhesion of the coating film of the adhesive composition containing the polyester resin are improved. In addition, handling and storage stability during coating are improved.
- the reduced viscosity in the present invention is a value determined by the method described in Examples.
- the upper limit of the reduction viscosity is not particularly limited, but is preferably 2.00 dl / g or less, and more preferably 1.00 dl / g or less. By setting the value to the upper limit or less, the solvent solubility of the polyester resin is improved and the dissolution stability is improved.
- the curing agent preferably reacts with the polyester resin of the present invention to form a crosslinked structure, and examples thereof include a phenol curing agent and an isocyanate curing agent.
- the phenol curing agent is preferably a resol type phenol resin synthesized from a phenol compound.
- examples of the trifunctional or higher functional phenol compound include phenol, m-cresol, m-ethylphenol, 3,5-xylenol, m-methoxyphenol, bisphenol-A, and bisphenol-F.
- examples of the bifunctional phenol compound include o-cresol, p-cresol, p-tert-butylphenol, p-ethylphenol, 2,3-xylenol, and 2,5-xylenol. These have two or more functional groups capable of methylolation per molecule of the phenol compound, and can be synthesized by methylolation with formaldehyde or the like. These can be used alone or in combination of two or more.
- the blending ratio of the trifunctional or higher functional phenol compound and the bifunctional phenol compound is 1/99 to 100/0 (part by mass), although it is arbitrarily blended according to the required coating film (cured film). Is preferable. For example, when the coating film requires hardness and acid resistance, it is preferable to use more than 30 parts by mass of a trifunctional or higher functional phenol compound, the coating film requires flexibility, and the residual stress after processing is low. If this is desired, the amount of the trifunctional or higher functional phenol compound is preferably less than 50 parts by mass.
- formaldehydes used when these phenol compounds are used as phenol resins include formaldehyde, paraformaldehyde or trioxane, and one or a mixture of two or more can be used.
- a monohydric alcohol having 1 to 8 carbon atoms, preferably 1 to 4 carbon atoms can be used.
- methanol, ethanol, n-propanol, n-butanol, isopropanol, isobutanol, tert-butanol and the like can be mentioned, and n-butanol is used from the viewpoint of compatibility with the polyester resin (A) and reaction curability. preferable.
- the phenol resin has an average of 0.3 or more, preferably 0.5 to 3 alkoxymethyl groups per phenol nucleus from the viewpoint of reactivity and compatibility with the polyester resin. If the number is less than 0.3, the curability with the polyester resin is poor and the strength of the cured coating film may decrease.
- the upper limit is not particularly limited, but if it exceeds the above range, the stability when the curing agent is blended may deteriorate.
- a method for obtaining a phenol resin in which the phenol compound of the trifunctional or higher functional and the phenol compound of the bifunctional phenol compound is mixed a method of mixing the phenol resin in an arbitrary ratio before converting it into a phenol resin by formaldehyde or a trifunctional method is used.
- the above phenol compounds and bifunctional phenol compounds may be separately converted into phenol resins, which may be mixed at an arbitrary mixing ratio.
- isocyanate curing agent examples include 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, xylene-1,4-diisocyanate, xylene-1,3-diisocyanate, tetramethylxylene diisocyanate, 4,4'.
- Diisocyanate such as aliphatic diisocyanate, isophorone diisocyanate (IPDI), hydrogenated tolylene diisocyanate, hydrogenated xylene diisocyanate, hydrogenated diphenylmethane diisocyanate and other alicyclic diisocyanates, and biuret, uretdione modified and carbodiimide modified of the isocyanate.
- Isocyanurate modified product, uretonimine modified product, adduct product with polyol, mixed modified product thereof, and one or more of these can be selected and used. It can also be used in the form of a urethane precursor such as a prepolymer, a modified product, a derivative or a mixture composed of an isocyanate compound and an active hydrogen compound such as a polyol or a polyamine.
- a blocked isocyanate curing agent in which the terminal NCO group of the isocyanate compound is blocked may be used.
- the blocking agent include phenolic compounds such as phenol, cresol, ethylphenol and butylphenol, 2-hydroxypyridine, butyl cellosolve, propylene glycol monomethyl ether, benzyl alcohol, methanol, ethanol, n-butanol, isobutanol, 2-ethylhexanol and the like.
- Alcohol compounds such as dimethyl malonate, diethyl malonate, methyl acetoacetate, ethyl acetoacetate, acetylaeton, mercaptan compounds such as butyl mercaptan and dodecyl mercaptan, acid amides such as acetoanilide and acetate amide.
- Systems compounds lactam compounds such as ⁇ -caprolactam, ⁇ -valerolactam, ⁇ -butyrolactam, imidazole compounds such as imidazole and 2-methylimidazole, urea compounds such as urea, thiourea and ethyleneurea, formamide oxime and acet.
- oxime compounds such as aldoxime, acetone oxime, methyl ethyl keto oxime, methyl isobutyl keto oxime and cyclohexanone oxime
- amine compounds such as diphenylaniline, aniline, carbazole, ethyleneimine and polyethyleneimine. These can be used alone or in admixture of two or more.
- Such a reaction between the blocking agent and the isocyanate compound can be carried out, for example, at 20 to 200 ° C., if necessary, using a known inert solvent or catalyst.
- the blocking agent is preferably used in an amount of 0.7 to 1.5 times the molar amount of the terminal isocyanate group.
- the blending ratio of the polyester resin and the curing agent in the polyester resin composition of the present invention is preferably 5 parts by mass or more of the curing agent with respect to 100 parts by mass of the polyester resin in order to improve the solvent resistance of the cured coating film. More preferably, it is 10 parts by mass or more of the curing agent. Further, in order to prevent the unreacted curing agent component from remaining and reducing the strength of the cured coating film, the mixing ratio of the curing agent is preferably 30 parts by mass or less, more preferably 20 parts by mass or less.
- a curing catalyst may be further added to the polyester resin composition.
- a catalyst By containing a catalyst, the performance of the cured film can be improved.
- the catalyst when the curing agent is a phenol resin, for example, sulfuric acid, p-toluene sulfonic acid, dodecylbenzene sulfonic acid, naphthalene sulfonic acid, dinonylnaphthalene sulfonic acid, dinonylnaphthalenedisulfonic acid, cypress sulfonic acid, phosphoric acid and these.
- Dodecylbenzenesulfonic acid and its neutralized product are preferable from the viewpoint of compatibility with polyester resin and hygiene.
- the curing agent is an isocyanate curing agent
- examples thereof include organotin compounds such as stannous octylate and dibutyltin dilaurylate, triethylamine, and the like, and one or more of these can be used in combination.
- the polyester resin composition of the present invention is preferably a solvent type, and the solid content concentration is preferably 20 to 60% by mass, more preferably 30 to 50% by mass.
- the solvent is used after the production of the polyester resin and the production of the resin composition, and further used as a diluent at the time of painting.
- the solvent that can be used is not particularly limited, but for example, esters such as ethyl acetate, butyl acetate and cellosolve acetate, ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone, ethers such as tetrahydrofuran and dioxane, toluene, xylene and the like.
- Aromatic hydrocarbons and the like can be mentioned. Of these, ethyl acetate or methyl ethyl ketone is usually preferable from the viewpoint of price, productivity, safety and the like.
- polyester resin and the polyester resin composition of the present invention are excellent in metal adhesion, curability and storage stability, they can be suitably used for coating compositions and adhesive compositions.
- the paint include applications for metal base materials, and specific examples thereof include pre-coated metal (PCM) paints and can paints.
- PCM pre-coated metal
- the adhesive an adhesive for dry laminating for bonding a metal base material such as aluminum foil and a plastic film can be mentioned.
- the volume was adjusted with 20 mL of 1.2N hydrochloric acid. Then, the treatment liquid was measured with a high-frequency inductively coupled plasma emission spectrometer (SPECTROBLUE manufactured by Hitachi High-Tech Science Corporation). Separately, a blank test was carried out, and the amount of metal element in the sample was quantified by a calibration curve prepared with a standard solution of the target element. The amount of metal element in the sample was calculated by the following formula.
- ⁇ Yttrium nitrate method (quantification of antimony element)> 0.5 g of a sample (polyester resin) was weighed in a platinum crucible, 5 mL of a 5% yttrium nitrate ethanol solution was added, and precarburization was performed up to 400 ° C. on a hot plate. Then, the ashing treatment was carried out at 550 ° C. for 8 hours using an electric furnace FO610 manufactured by Yamato Kagaku Co., Ltd. After ashing, 20 mL of 1.2N hydrochloric acid was added to dissolve nitrate, which was used as a measurement solution.
- the measurement was performed with a high-frequency inductively coupled plasma emission spectrometer (SPECTROBLUE manufactured by Hitachi High-Tech Science Corporation). Separately, a blank test was carried out, and the amount of metal element in the sample was quantified by a calibration curve prepared with a standard solution of the target element. The amount of metal element in the sample was calculated by the following formula.
- the content of the element in 0.5 g of the sample can be determined as follows.
- A (BC) x 20 / 0.5 Element content in sample: A (mass ppm) Element concentration in pretreatment liquid: B (mg / L) Element concentration in blank test solution (measurement blank): C (mg / L)
- the lower limit of detection of this method is 1 mass ppm, and the measurement result less than the lower limit of detection is expressed as ⁇ 1 (mass ppm).
- the polymerization time is defined as a predetermined reduced viscosity ( ⁇ sp / c> 0.50 dl / g) after reaching the conditions of a temperature of 260 ° C. and a vacuum degree of 0.3 mmHg or less in the polycondensation step. It is assumed that it took time to become. When the polymerization time exceeded 100 minutes, the polycondensation step was terminated and the polyester resin was taken out. (judgement) ⁇ : Polymerization time ⁇ 100 minutes ⁇ : Polymerization time> 100 minutes
- Equation 1 ⁇ (Number of seconds for sample solution to fall)-(Number of seconds for blank to fall) ⁇ / (Number of seconds for blank to fall) / (Mass of polyester resin x 100/25)
- PET polyethylene terephthalate film
- polyester resin layer thickness 5 ⁇ m
- aluminum foil thickness 9 ⁇ m
- the polyester resin solution was applied to the PET film corona-treated surface with an applicator at room temperature so that the thickness of the polyester resin solution after drying was 5 ⁇ m, and the solvent was volatilized with a hot air dryer at 120 ° C. for 30 seconds. ..
- the coated surface was overlapped with the aluminum foil and bonded by a dry lamination method at a roll temperature of 120 ° C., a roll load of 0.3 MPa, and a pressure-bonded object speed of 1 m / min to prepare a three-layer laminate, which was cut into a width of 25 mm. bottom.
- ⁇ Adhesive strength> The adhesive strength between the aluminum foil of the three-layer laminated film and the PET film was measured using a tensile tester. The atmospheric temperature at the time of measurement was set to 25 ° C., the peeling speed was set to 100 mm / min, the tensile strength when peeled by the 90 ° peeling method was defined as the adhesive strength, and the unit of the adhesive strength was N / 25 mm. The results are shown in Table 1. (judgement) ⁇ : 5N / 25mm or more ⁇ : 3N / 25mm or more and less than 5N / 25mm ⁇ : 3N / 25mm or less
- a tin plate JIS G 3303 (2008) SPTE, 70 mm x 150 mm x 0.3 mm
- a bar coater so that the film thickness after drying is 10 ⁇ 2 ⁇ m
- baking conditions 240 Curing and baking was performed at ° C. (PMT: maximum temperature reached by the substrate) for 1 minute, and this was used as a test piece (hereinafter referred to as a test piece).
- Example 1 In a reaction vessel equipped with a stirrer, condenser, and thermometer, 233.0 parts of terephthalic acid, 532.1 parts of isophthalic acid, 13.5 parts of trimellitic anhydride, 155.3 parts of ethylene glycol, 260.5 parts of neopentyl glycol, As a catalyst, tetra-n-butyl titanate (hereinafter, may be abbreviated as TBT) is charged in an amount of 0.0023 mol% based on the total acid component, and the esterification reaction is carried out while raising the temperature from 180 ° C. to 240 ° C. over 4 hours.
- TBT tetra-n-butyl titanate
- the reduced viscosity was 0.63 (dl / g), the acid value was 55 (eq / t), and the metal content was 5 (mass ppm) for titanium and 71 (mass ppm) for zinc.
- Table 1 The results of the performance evaluation are shown in Table 1.
- Examples 2 to 5, 8, 9, Comparative Examples 2 to 4 According to the production example of Example 1, a polyhydric alcohol component and a polyvalent carboxylic acid component were charged to produce a polyester resin. However, the blending ratio of the metal catalyst was changed so as to be a predetermined amount with respect to the obtained polyester resin. Table 1 shows the resin composition, resin physical properties, and evaluation results.
- Examples 6 and 7 The amount of ethylene glycol so that the charge ratios of the total polyhydric alcohol component and the total polyhydric carboxylic acid component (total polyhydric alcohol component / total polyhydric alcohol component (molar ratio)) are 1.02 and 1.10, respectively.
- a polyester resin was produced in the same manner as in Example 1 except that the amount of neopentyl glycol was changed. Table 1 shows the resin composition, resin physical properties, and evaluation results.
- Example 10 196.5 parts of terephthalic acid, 474.2 parts of isophthalic acid, 7.8 parts of trimellitic anhydride, 27.1 parts of ethylene glycol, 263.6 parts of neopentyl glycol in a reaction vessel equipped with a stirrer, a condenser and a thermometer. 201.4 parts of 1,4-cyclohexanedimethanol, 0.0051 mol% of TBT as a catalyst was charged with respect to the total acid component, and the esterification reaction (esterification step) was carried out while raising the temperature from 180 ° C. to 240 ° C. over 4 hours. ) Was performed.
- Example 1 Production of Example 1 except that the amount of TBT charged was changed to 0.00024 mol% with respect to the total acid component and the amount of zinc acetate dihydrate charged was changed to 0.017 mol% with respect to the total acid component.
- a polyester resin was produced according to the example. The reaction was stopped when the polycondensation reaction time was 100 minutes. Table 1 shows the resin composition, resin physical properties, and evaluation results.
- Example 5 A polyester resin was produced in the same manner as in Example 7 except that the amount of zinc acetate dihydrate charged was changed to 0.00326 mol% with respect to the total acid component. Table 1 shows the resin composition, resin physical properties, and evaluation results.
- Example 7 A polyester resin was produced in the same manner as in Example 1 except that the amount of TBT charged was changed to 0.056 mol% with respect to the total acid component and zinc acetate dihydrate was not used. Table 1 shows the resin composition, resin physical properties, and evaluation results.
- TPA Terephthalic acid
- TMA Trimellitic anhydride
- EG Ethylene glycol
- NPG Neopentyl glycol
- CHDM 1,4-Cyclohexanedimethanol
- Biomass EG Biomass ethylene glycol (manufactured by India Glycol)
- Biomass NPG Biomass neopentyl glycol (Manufactured by Perstoop, NetureN40)
- the present invention it is possible to provide a polyester resin having good productivity, color tone, few foreign substances, and excellent metal adhesion and curability. Since this resin has excellent metal adhesion, curability and storage stability, it is used as an adhesive for dry laminating, especially as an adhesive for bonding a metal base material such as aluminum foil to a plastic film, and for coating applications, especially for coating metal plates. Suitable for PCM (pre-coated metal) paints and can paints.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Polyesters Or Polycarbonates (AREA)
Abstract
Description
本発明のポリエステル樹脂は、チタンを金属換算で2質量ppm以上10質量ppm以下含有することを必須とする。生産性が高くなること、並びに高分子量のポリエステル樹脂が得られやすくなり、固形保存安定性や金属密着性が良好となることから、3質量ppm以上であることが好ましく、より好ましくは4質量ppm以上であり、さらに好ましくは5質量ppm以上である。また、ポリエステル樹脂の色調が良好となることから、9質量ppm以下であることが好ましく、より好ましくは8質量ppm以下であり、さらに好ましくは7質量ppm以下である。
硬化剤は、本発明のポリエステル樹脂と反応し架橋構造を形成するものであることが好ましく、例えばフェノール硬化剤、またはイソシアネート硬化剤などを挙げることができる。
ポリエステル樹脂を、重クロロホルムに溶解し、VARIAN社製 NMR装置400-MRを用いて、1H-NMR分析を行ってその積分値比より、モル比を求めた。
<乾式灰化・酸分解法(チタン、亜鉛元素の定量)>
試料(ポリエステル樹脂)0.5gを白金製るつぼに秤量し、ホットプレート上で400℃まで予備炭化を行った。その後、ヤマト科学社製電気炉FO610型を用いて、550℃で8時間灰化処理を実施した。灰化後、6.0Nの塩酸を3mL添加し、ホットプレート上で100℃で酸分解を行い、塩酸が完全に揮発するまで加熱処理を行った。酸分解終了後に、1.2Nの塩酸20mLを用いて定容した。その後、処理液を高周波誘導結合プラズマ発光分析装置(日立ハイテクサイエンス社製、SPECTROBLUE)で測定した。別途、空試験を実施し、目的元素の標準液で作成した検量線により試料中の金属元素量を定量した。試料中の金属元素量は下記式により求めた。試料0.5g中の元素の含有量は、以下のようにして求めることができる。
A=(B-C)×20/0.5
試料中の元素含有量:A(質量ppm)
前処理液中の元素濃度:B(mg/L)
空試験液中の元素濃度(測定ブランク):C(mg/L)
試料(ポリエステル樹脂)0.5gを白金製るつぼに秤量し、5%硝酸イットリウムエタノール溶液を5mL添加し、ホットプレート上で400℃まで予備炭化を行った。その後、ヤマト科学社製電気炉FO610型を用いて、550℃で8時間灰化処理を実施した。灰化後、1.2Nの塩酸20mLを添加し、硝酸塩を溶解させたものを測定溶液とした。高周波誘導結合プラズマ発光分析装置(日立ハイテクサイエンス社製、SPECTROBLUE)で測定した。別途、空試験を実施し、目的元素の標準液で作成した検量線により試料中の金属元素量を定量した。試料中の金属元素量は下記式により求めた。試料0.5g中の元素の含有量は、以下のようにして求めることができる。
A=(B-C)×20/0.5
試料中の元素含有量:A(質量ppm)
前処理液中の元素濃度:B(mg/L)
空試験液中の元素濃度(測定ブランク):C(mg/L)
なお、本手法の検出下限値は1質量ppmであり、検出下限値未満の測定結果に関しては、<1(質量ppm)と表記した。
本発明において重合時間とは、重縮合工程において温度260℃、真空度0.3mmHg以下の条件に達してから、所定の還元粘度(ηsp/c>0.50dl/g)になるまでに掛かった時間とする。また重合時間が100分を超えた時点で重縮合工程を終了し、ポリエステル樹脂を取り出した。
(判定)
〇:重合時間≦100分
×:重合時間>100分
ポリエステル樹脂をメチルエチルケトン/トルエン=1/1(質量比)に25℃下で溶解して固形分30質量%のポリエステル樹脂溶液を調製した。石油製品色試験器(日本電色工業社製、OME-2000)を使用し、ポリエステル樹脂溶液のカラーb値を測定した。
ポリエステル樹脂5gをフェノール/テトラクロロエタン(6/4(質量比))の混合溶媒80mLに加え、135℃で2時間攪拌し、溶解させた。次にその溶液を孔径0.5μmのポリテトラフルオロエチレン(PTFE)フィルターでろ過した後のろ物をSEM-EDX(日本電子社製、JSM-6510A)(倍率:100倍、信号:SEI(二次電子像)、焦点距離:10mm、印加電圧:15kV、真空モード: 0.1mPa)で観察(目視)し、カウントした。
なお、フィルター全面に大量の異物があり、カウントが困難な場合、「×」と評価した。
ポリエステル樹脂の試料0.1g±0.005gをフェノール/テトラクロロエタン(6/4(質量比))の混合溶媒に約50℃で溶解させ、25mLのメスフラスコでメスアップし、サンプル溶液を調製する。次いで、サンプル溶液を粘度管に入れ、サンプル溶液が30℃になるように30℃の水槽に15~20分入れる。所定の温度になり次第、粘度管の標線を確認しながら落下秒数を測定し、ブランクの溶媒の落下秒数の差から還元粘度(単位:dl/g)を算出する。算出式は式1に示す。
式1:{(サンプル溶液の落下秒数)-(ブランクの落下秒数)}/(ブランクの落下秒数)/(ポリエステル樹脂の質量×100/25)
ポリエステル樹脂の試料0.2gを40mlのクロロホルムに溶解し、0.01Nの水酸化カリウムエタノール溶液で滴定し、ポリエステル樹脂106gあたりの当量(eq/t)を求めた。指示薬にはフェノールフタレインを用いた。
ポリエステル樹脂を温度40℃、湿度50%で3ヶ月、ポリエチレン製の袋の中に保管し、分子量の低下の有無について確認した。分子量低下は還元粘度保持率で評価した。
還元粘度保持率(%)=(3ヶ月保管後のポリエステル樹脂の還元粘度)/(初期のポリエステル樹脂の還元粘度)×100
なお、保管開始時の還元粘度を初期値とする。
ポリエステル樹脂を酢酸エチルで固形分30質量%に溶解し樹脂溶液を作製した。前記樹脂溶液を温度40℃、湿度50%で3か月、静置状態で保管し、カスミの有無について確認した。
(判定)
○:樹脂溶液にカスミの発生がない。
×:樹脂溶液にカスミの発生がある。
<積層体作成>
ポリエチレンテレフタレートフィルム(PET:東洋紡製E5107、25μm)/ポリエステル樹脂層(厚さ5μm)/アルミニウム箔(厚さ9μm)の3層積層体を以下に記載の方法で作製した。まず、固形分濃度30質量%となるようにポリエステル樹脂をメチルエチルケトンに溶解させ、ポリエステル樹脂溶液を得た。次にポリエステル樹脂溶液を常温にてアプリケーターにより、PETフィルムコロナ処理面に乾燥後のポリエステル樹脂溶液塗布厚が5μmとなるように塗布し、120℃にて30秒熱風乾燥機で溶剤を揮散させた。その後、塗布面をアルミニウム箔と重ね合わせ、ロール温度120℃、ロール荷重0.3MPa、被圧着物速度1m/分でドライラミネーション法にて貼り合せ、3層積層体を作製し、25mm幅に裁断した。
3層積層フィルムのアルミニウム箔とPETフィルムとの間の接着強度を、引張り試験機を用いて測定した。測定時の雰囲気温度を25℃、剥離速度を100mm/分に設定し、90°剥離方法で剥離した際の引張り強度を接着強度とし、接着強度の単位は、N/25mmとした。結果を表1に示す。
(判定)
○:5N/25mm以上
△:3N/25mm以上5N/25mm未満
×:3N/25mm未満
<試験片作製>
ポリエステル樹脂をシクロヘキサノン/ソルベッソ-150=1/1(質量比)に溶解して固形分40質量%のポリエステル樹脂溶液を調製した。次にポリエステル樹脂溶液42.5部、硬化剤としてレゾール型フェノール樹脂(Allnex社製、PR-521、固形分60質量%)5部、触媒としてドデシルベンゼンスルホン酸(King Industries社製、Nacure(登録商標)5076、固形分1質量%)2部を配合した後、シクロヘキサノン/ソルベッソ-150=1/1(質量比)で塗装に適した粘度になるまで希釈し、フェノール硬化剤配合物を得た。
ブリキ板(JIS G 3303(2008) SPTE、70mm×150mm×0.3mm)の片面にバーコーターでフェノール硬化剤配合物を乾燥後の膜厚が10±2μmになるように塗装し、焼付条件240℃(PMT:基材到達最高温度)×1分間として硬化焼き付けを行い、これを試験片とした(以下、試験片という)。
試験片の硬化膜面に、メチルエチルケトンを浸したガーゼフェルトを1cm2接触するように押し当て、500gの荷重をかけてラビング試験を行った。硬化膜が剥がれるまでの回数(一往復で一回とする)を、以下の基準で評価した。
(判定)
〇:50回以上でも塗膜が剥がれず、塗膜に変化がみられなかった。
△:20~49回で塗膜が剥がれ、ブリキ板が露出した。
×:19回以下で塗膜が剥がれ、ブリキ板が露出した。
<試験用サンプル作製>
ポリエステル樹脂をメチルエチルケトンに溶解して固形分30質量%のポリエステル樹脂溶液を調製した。次にポリエステル樹脂溶液10部、硬化剤としてヘキサメチレンジイソシアネートのイソシアヌレート体(DESMODUR(登録商標) N3300:Covestro社製、固形分30質量%)1部を配合し、イソシアネート硬化剤配合物を得た。
前記イソシアネート硬化剤配合物をポリエチレンテレフタレートフィルム(PETフィルム)上に乾燥後の厚みで、30μmになるように塗布し、100℃90秒間熱風乾燥後、40℃で3日間保温(エージング)し、硬化性試験用サンプルを作製した。
メチルエチルケトン/トルエン=1/1(質量比)の溶液中に、硬化性試験用サンプルが全て漬かるように室温で1時間浸漬した後、溶解しなかった残存量から以下の式でゲル分率を求めた。
ゲル分率(%)=(浸漬後の硬化性試験用サンプルの質量-PETフィルムの質量)/(浸漬前の硬化性試験用サンプルの質量-PETフィルムの質量)×100
(判定)
○:80%以上
△:20%以上80%未満
×:20%未満
<試料の調製>
1.ポリエステル樹脂100mgをクロロホルム2mlに溶解する。
2.その溶液にアセトニトリル18mlを加えて再沈殿を行い、遠心分離する。
3.遠心分離した上澄み2mlを乾固(溶剤を完全に留去)した後にDMF(N,N-ジメチルホルムアミド)250μlに溶解し、試料を調製する。
4.高速液体クロマトグラフ(HPLC)を用いて下記条件により測定する。
<HPLC測定条件>
装置:ACQUITY UPLC(Waters製)
カラム:BEH-C18 2.1×150mm(Waters製)
移動相:溶離液A:0.1%ギ酸水溶液(v/v)
溶離液B:アセトニトリル
グラジエントB%:5→98→98%(0→25→35分)
流速:0.2ml/分
カラム温度:40℃
検出器:UV-258nm
<定量方法>
上記のHPLCの分析条件下で、未反応の各酸成分を測定し、溶出時間の確認、および各成分のピーク面積値を測る。次いで、上記のHPLCの分析条件下で試料を測定し、得られたクロマトグラムのピーク面積値と標品のピーク面積値の比により、未反応の酸成分の量を算出(絶対検量線法)する。
攪拌機、コンデンサー、温度計を具備した反応容器にテレフタル酸233.0部、イソフタル酸532.1部、無水トリメリット酸13.5部、エチレングリコール155.3部、ネオペンチルグリコール260.5部、触媒としてテトラ-n-ブチルチタネート(以下、TBTと略記する場合がある)を全酸成分に対して0.0023モル%仕込み、180℃から240℃まで4時間かけて昇温しながらエステル化反応(エステル化工程)を行った(仕込みの全多価アルコール成分/全多価カルボン酸成分=1.07(モル比))。次いで酢酸亜鉛二水和物を全酸成分に対して0.023モル%仕込み、系内を徐々に減圧していき、20分かけて5mmHgまで減圧し、さらに0.3mmHg以下の真空下、260℃にて80分間重縮合反応(重縮合工程)を行った。得られたポリエステル樹脂(1)はNMRによる組成分析の結果、多価カルボン酸成分がモル比でテレフタル酸/イソフタル酸/トリメリット酸=30.0/68.5/1.5(モル%)であり、多価アルコール成分がモル比でエチレングリコール/ネオペンチルグリコール=50.0/50.0であった。また、還元粘度は0.63(dl/g)、酸価は55(eq/t)、金属含有量はチタンが5(質量ppm)、亜鉛が71(質量ppm)であった。性能評価の結果は表1に記す。
実施例1の製造例に準じて、多価アルコール成分と多価カルボン酸成分を仕込みポリエステル樹脂を製造した。但し、金属触媒は得られるポリエステル樹脂に対して所定量となるように配合比率を変更した。樹脂組成、樹脂物性および評価結果を表1に記す。
全多価アルコール成分と全多価カルボン酸成分との仕込み割合(全多価アルコール成分/全多価アルコール成分(モル比))が、それぞれ1.02、1.10になるようにエチレングリコール量およびネオペンチルグリコール量を変更したこと以外は実施例1と同様にポリエステル樹脂を製造した。樹脂組成、樹脂物性および評価結果を表1に記す。
攪拌機、コンデンサー、温度計を具備した反応容器にテレフタル酸196.5部、イソフタル酸474.2部、無水トリメリット酸7.8部、エチレングリコール27.1部、ネオペンチルグリコール263.6部、1,4-シクロヘキサンジメタノール201.4部、触媒としてTBTを全酸成分に対して0.0051モル%仕込み、180℃から240℃まで4時間かけて昇温しながらエステル化反応(エステル化工程)を行った。次いで酢酸亜鉛二水和物を全酸成分に対して0.019モル%仕込み、系内を徐々に減圧していき、20分かけて5mmHgまで減圧し、さらに0.3mmHg以下の真空下、260℃にて80分間重縮合反応(重縮合工程)を行った。その後、減圧を止めて、窒素気流下で220℃まで冷却し、無水トリメリット酸7.8部を添加し、220℃で2時間撹拌しカルボキシル基変性(後付加)を行い、ポリエステル樹脂を得た。樹脂組成、樹脂物性および評価結果を表1に示す。
TBT量の仕込み量を全酸成分に対して0.00024モル%、酢酸亜鉛二水和物の仕込み量を全酸成分に対して0.017モル%に変更したこと以外は実施例1の製造例に準じてポリエステル樹脂を製造した。なお、重縮合反応の時間が100分の時点で、反応を止めた。樹脂組成、樹脂物性および評価結果を表1に記す。
酢酸亜鉛二水和物の仕込み量を全酸成分に対して0.00326モル%に変更したこと以外は実施例7と同様にポリエステル樹脂を製造した。樹脂組成、樹脂物性および評価結果を表1に記す。
実施例1の製造例に準じて、但し手順を変更し、酢酸亜鉛二水和物をエステル化反応(エステル化工程)前に添加し、ポリエステル樹脂を製造した。樹脂組成、樹脂物性および評価結果を表1に記す。
TBT量の仕込み量を全酸成分に対して0.056モル%に変更し、酢酸亜鉛二水和物を使用しなかったこと以外は、実施例1と同様にポリエステル樹脂を製造した。樹脂組成、樹脂物性および評価結果を表1に記す。
TPA:テレフタル酸
IPA:イソフタル酸
SA:セバシン酸
TMA:無水トリメリット酸
EG:エチレングリコール
NPG:ネオペンチルグリコール
CHDM:1,4-シクロヘキサンジメタノール
バイオマスEG:バイオマスエチレングリコール(インディアグライコール社製)
バイオマスNPG:バイオマスネオペンチルグリコール(パーストープ社製、NeetureN40)
Claims (8)
- チタンを金属換算で2~10質量ppmおよび亜鉛を金属換算で50~100質量ppm含有したポリエステル樹脂であり、かつ前記ポリエステル樹脂5g中の異物の含有量が15個以下であるポリエステル樹脂。
- 前記異物は多価カルボン酸の亜鉛塩を含むものである請求項1に記載のポリエステル樹脂。
- 還元粘度が0.10dl/g以上であり、酸価が50eq/t以上である請求項1または2に記載のポリエステル樹脂。
- 無水トリメリット酸の含有量が1000質量ppm以下であることを特徴とする請求項1~3のいずれかに記載のポリエステル樹脂。
- 請求項1~4のいずれかに記載のポリエステル樹脂と、イソシアネート硬化剤またはフェノール硬化剤を含有するポリエステル樹脂組成物。
- 請求項5に記載のポリエステル樹脂組成物を含有する塗料組成物。
- 請求項5に記載のポリエステル樹脂組成物を含有する接着剤組成物。
- チタン触媒の存在下かつ亜鉛触媒の不存在下でプレポリマーを製造した後、チタン触媒および亜鉛触媒の存在下で重縮合する請求項1~4のいずれかに記載のポリエステル樹脂の製造方法。
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JP7445228B2 (ja) | 2021-09-22 | 2024-03-07 | 東洋紡エムシー株式会社 | 接着剤樹脂組成物 |
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