WO2015041271A1 - ポリエステルの製造方法 - Google Patents
ポリエステルの製造方法 Download PDFInfo
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- WO2015041271A1 WO2015041271A1 PCT/JP2014/074626 JP2014074626W WO2015041271A1 WO 2015041271 A1 WO2015041271 A1 WO 2015041271A1 JP 2014074626 W JP2014074626 W JP 2014074626W WO 2015041271 A1 WO2015041271 A1 WO 2015041271A1
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- polyester
- polycondensation
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- heat resistance
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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
- 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
- C08G63/85—Germanium, tin, lead, arsenic, antimony, bismuth, titanium, zirconium, hafnium, vanadium, niobium, tantalum, or compounds thereof
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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
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/181—Acids containing aromatic rings
- C08G63/183—Terephthalic acids
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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
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/78—Preparation processes
- C08G63/80—Solid-state polycondensation
Definitions
- the present invention relates to a method for producing a polyester. More specifically, the present invention has a thermal property that the b * value does not increase when heated, and thus has excellent heat resistance, and the yellowness is enhanced even when heated. It relates to a method for producing no polyester.
- Polyesters typified by polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc. have excellent mechanical and chemical properties. Depending on their properties, for example, textiles for clothing and industrial materials, and packaging It is used in a wide range of fields such as films and sheets for magnetic tapes, bottles that are hollow molded products, casings for electrical and electronic components, and other various molded products and components.
- Polyesters mainly comprising an aromatic dicarboxylic acid component and an alkylene glycol component which are typical polyesters, for example, polyethylene terephthalate is an esterification reaction between terephthalic acid and ethylene glycol, or an ester of dimethyl terephthalate and ethylene glycol. It is produced by producing bis (2-hydroxyethyl) terephthalate (BHET) and an oligomer containing the same by exchange, and subjecting this to melt polycondensation in a vacuum at a high temperature in the presence of a polycondensation catalyst.
- BHET bis (2-hydroxyethyl) terephthalate
- polyester biaxially stretched bottle applications known as PET bottles
- PET bottles require higher molecular weight polyesters than fiber and film applications so that the resulting bottles have sufficient strength.
- a polyester having a higher molecular weight by further heating and solid-phase polycondensation of the condensate is used.
- antimony trioxide is well known as such a polycondensation catalyst for producing polyester.
- Antimony trioxide is a catalyst that is inexpensive and has excellent catalytic activity, but metal antimony is precipitated during the polycondensation of the polyester raw material, resulting in darkening of the resulting polyester, and foreign matter being mixed into the resulting polyester. is there.
- antimony trioxide is inherently toxic, in recent years, development of a catalyst containing no antimony has been desired.
- the solid phase polycondensation of polyester is a method in which the polyester obtained by melt polycondensation is further heated to obtain a higher molecular weight polyester. Is formed into a preform, reheated, and then stretched in the longitudinal direction in a blow mold and then stretched in the transverse direction.
- the preform in the production of the above-described polyester biaxially stretched bottle, the preform can be reheated to a temperature suitable for stretch blow molding so that it can be reheated in a smaller amount of heat in a shorter time. Excellent reheatability is required.
- the polyester obtained by using the conventional titanium-based catalyst has a yellowish color.
- a beverage container such as water is favored in a bluish color tone.
- the polyester for axially stretched bottles is also required to improve its color tone so that it has a bluish color tone.
- the polyester obtained by using the conventional polycondensation catalyst is heated for various purposes at various stages as described above.
- the polyester may contain a hue adjusting agent. , There is a problem that a part is thermally decomposed and the yellow color is strengthened.
- a particulate titanate catalyst having a particle structure that has a titanate coating layer on the surface of solid base particles such as magnesium hydroxide and hydrotalcite has recently been used for polyester production.
- the present inventors have proposed a polycondensation catalyst (see Patent Document 5).
- the titanate catalyst having a particle structure in which the surface of the solid base particles is provided with the titanate coating layer may be simply referred to as a particulate titanate catalyst.
- dicarboxylic acids can be obtained by esterification or transesterification of dicarboxylic acids or their ester-forming derivatives with glycols.
- a method for producing a polyester comprising a step of producing an oligomer containing a diester and then a step of melt polycondensation of the oligomer to obtain a polyester as a melt polycondensate, at least the oligomer of the above two steps is melted In the polycondensation step, the b * value does not increase even when heated by melt polycondensation of the oligomer in the presence of titanium nitride and the particulate titanate catalyst, and therefore the yellowness is not enhanced. And found that polyester with excellent heat resistance can be obtained It is those that led to the invention.
- an object of the present invention is to provide a method for producing a polyester excellent in heat resistance, in which the b * value does not increase even when heated, and thus the yellowness is not enhanced.
- a step of producing an oligomer containing a dicarboxylic acid diester by an esterification reaction or a transesterification reaction between a dicarboxylic acid or an ester-forming derivative thereof and a glycol and then melting and polycondensing the oligomer.
- the polyester production method including a step of obtaining a polyester as a polycondensate, at least in the step of melt polycondensation of the oligomer among the two steps, a titanate coating layer is formed on the surface as titanium nitride and the polycondensation catalyst.
- a method for producing a polyester characterized in that a polyester as a melt polycondensate is obtained by melt polycondensation of the oligomer in the presence of solid base particles.
- Titanium nitride is a nitride of titanium, is solid at room temperature, and has a melting point of about 2950 ° C.
- titanium nitride generally has a composition of TiN, but is known to be stable in a wide range from TiN 0.42 to TiN 1.16 .
- the method for producing a polyester as described above further comprising a step of solid-phase polycondensation of the polyester as the melt polycondensate to obtain a polyester as the solid-phase polycondensate. Is done.
- the dicarboxylic acid is an aromatic dicarboxylic acid
- the ester-forming derivative of the dicarboxylic acid is a dicarboxylic acid dialkyl ester
- the glycol is an alkylene glycol
- the dicarboxylic acid diester Is an oligomer containing an aromatic dicarboxylic acid bis (hydroxylalkyl) ester.
- the solid base is preferably magnesium hydroxide or hydrotalcite.
- titanium nitride is preferably present in an amount of 3 ppm or more, particularly 5 ppm or more in terms of titanium with respect to the polyester obtained.
- the method of the present invention unlike the polyester obtained by the method using only the particulate titanate catalyst described above without using titanium nitride together, by using the titanium nitride and particulate titanate catalyst together, In both the melt polycondensation and the solid phase polycondensation, a b * value does not increase by heating, and therefore a polyester having excellent heat resistance in which the yellowishness is not enhanced can be obtained.
- the method of the present invention in particular, in the production of polyester by solid phase polycondensation, by using together the hydrotalcite particles having titanic acid coating layer on the surface and titanium nitride as the particulate titanic acid catalyst, Compared with the case where titanium nitride is not used in combination, the rate of increase in intrinsic viscosity per unit time can be increased, and therefore the solid phase polycondensation rate can be increased to obtain a polyester.
- the method for producing a polyester according to the present invention comprises a step of producing an oligomer containing a dicarboxylic acid diester by an esterification reaction or transesterification reaction between a dicarboxylic acid or an ester-forming derivative thereof and a glycol, and then melt polycondensation of the oligomer.
- the method for producing polyester comprising the step of obtaining polyester as a melt polycondensate, at least in the step of melt polycondensation of the oligomer among the two steps, titanic acid is formed on the surface as titanium nitride and the polycondensation catalyst.
- the oligomer is melt polycondensed in the presence of solid base particles having a coating layer to obtain a polyester as a melt polycondensate.
- the method for producing a polyester described above further comprising a step of solid-phase polycondensation of the polyester as the melt polycondensate to obtain a polyester as the solid-phase polycondensate. Is done.
- a particulate titanic acid catalyst that is, solid base particles having a titanic acid coating layer on the surface as described above is used as a polycondensation catalyst for polyester production.
- the solid base examples include oxides and hydroxides of alkaline earth metals, various composite oxides, oxides of aluminum, zinc, lanthanum, zirconium, thorium, and the like, and composites thereof. be able to. These oxides and composites may be partially substituted with salts such as carbonates. Therefore, as a solid base, more specifically, oxides or hydroxides such as magnesium, calcium, strontium, barium, aluminum, zinc, such as magnesium hydroxide, calcium oxide, strontium oxide, barium oxide, zinc oxide, etc. And composite oxides such as hydrotalcite. Among these, according to the present invention, magnesium hydroxide or hydrotalcite is preferably used.
- Titanic acid has the chemical formula TiO 2 ⁇ nH 2 O (In the formula, n is a number satisfying 0 ⁇ n ⁇ 2.)
- the hydrous titanium oxide represented by the formula (1), and such titanic acid can be obtained, for example, by decomposing a certain kind of titanium compound as described later.
- the proportion of the titanic acid coating layer is less than 0.1 parts by weight in terms of TiO 2 with respect to 100 parts by weight of the solid base, the polymerization activity of the resulting particulate titanic acid catalyst is low. High molecular weight polyester cannot be obtained with good productivity.
- the ratio of the coating layer made of titanic acid is more than 50 parts by weight in terms of TiO 2 with respect to 100 parts by weight of the solid base, the polyester is decomposed by side reactions that are considered to be derived from the catalyst during the production of the polyester. Is likely to occur.
- Such a particulate titanic acid catalyst maintains an aqueous slurry of solid base particles at a temperature of 5 to 100 ° C., preferably 25 to 40 ° C., and is converted into TiO 2 with respect to 100 parts by weight of the solid base.
- 0.1 to 50 parts by weight of a water-soluble titanium compound is added, and if necessary, an alkali is added to the resulting mixture to adjust the water-soluble titanium compound in the slurry to a pH of 5 to 12, preferably 7 to 10 to hydrolyze the water-soluble titanium compound to form a coating layer made of titanic acid on the surface of the solid base particles, and the solid base having the coating layer made of titanic acid on the surface thus obtained.
- the drying temperature is preferably in the range of 60 to 180 ° C, particularly preferably in the range of 100 to 130 ° C.
- the particulate titanic acid catalyst can be obtained by another method. While maintaining an aqueous slurry of solid base particles at 5 to 100 ° C., preferably 25 to 40 ° C., 0.1 to 50 parts by weight of water-soluble titanium in terms of TiO 2 with respect to 100 parts by weight of the solid base A compound and an alkali are added at the same time, and if necessary, an alkali is further added and hydrolyzed at a pH of 5 to 12, preferably 7 to 10. Similarly, the surface of the solid base particles is coated with titanic acid. It can be obtained by forming a layer, drying at a temperature of 60 to 180 ° C., and grinding.
- water-soluble titanium compounds examples include titanium halides such as titanium tetrachloride, inorganic acid salts such as titanium sulfate and titanium nitrate, organic acid salts such as titanium oxalate, and titanium such as titanyl ammonium oxalate.
- the acid salt include titanium halides, among which titanium halides such as titanium tetrachloride are preferably used.
- the alkali is not particularly limited, but usually an alkali metal hydroxide such as sodium hydroxide, potassium hydroxide, or lithium hydroxide is preferably used.
- the solid base is preferably magnesium hydroxide or hydrotalcite.
- the aqueous slurry of magnesium hydroxide particles is obtained, for example, by neutralizing an aqueous solution of a water-soluble magnesium salt such as magnesium chloride or magnesium nitrate with an alkali such as sodium hydroxide or ammonia, and precipitating magnesium hydroxide.
- An aqueous slurry or a slurry obtained by dispersing magnesium hydroxide particles in water In the case of obtaining an aqueous slurry of magnesium hydroxide by neutralizing such an aqueous solution of a water-soluble magnesium salt with an alkali, the aqueous solution of the water-soluble magnesium salt and the alkali may be simultaneously neutralized. In addition to neutralization.
- the origin of the magnesium hydroxide particles is not limited, and for example, powder obtained by pulverizing natural ore, powder obtained by neutralizing magnesium salt aqueous solution with alkali, etc. There may be.
- the hydrotalcite is preferably the following general formula (I) M 2+ 1-x M 3+ x (OH -) 2 A n- x / n ⁇ mH 2 O ... (I) (wherein M 2+ represents at least one divalent metal ion selected from Mg 2+ , Zn 2+ and Cu 2+ , and M 3+ represents at least one trivalent metal selected from Al 3+ , Fe 3+ and Ti 3+.
- An represents an ion
- a n ⁇ represents at least one anion selected from SO 4 2 ⁇ , Cl ⁇ , CO 3 2 ⁇ , and OH ⁇
- n represents the valence of the anion
- x represents 0 ⁇ x ⁇ 0.5 is a number that satisfies 0.5
- m is a number that satisfies 0 ⁇ m ⁇ 2.
- M 2+ is the Mg 2+
- M 3+ is the Al 3+
- hydrotalcite A n- is CO 3 is 2, i.e., the general formula (II) Mg 2+ 1-x Al 3+ x (OH ⁇ ) 2 (CO 3 2 ⁇ ) x / 2 ⁇ mH 2 O (II) (Wherein x and m are the same as above) Hydrotalcite represented by the formula is preferably used.
- Such hydrotalcite can be easily obtained as a commercial product, but if necessary, it can also be produced by a conventionally known method, for example, a hydrothermal method, using appropriate raw materials. it can.
- the water slurry of hydrotalcite particles refers to a slurry obtained by dispersing hydrotalcite particles as described above in water.
- the dicarboxylic acid is exemplified by aliphatic dicarboxylic acid exemplified by succinic acid, glutaric acid, adipic acid, dodecanedicarboxylic acid, etc., terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, etc.
- Aromatic dicarboxylic acids can be mentioned, and examples of ester-forming derivatives of these dicarboxylic acids include dialkyl esters.
- examples of the glycol include ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, butylene glycol, 1,4-cyclohexanedimethanol and the like.
- aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid and naphthalenedicarboxylic acid are preferably used as the dicarboxylic acid
- alkylene glycols such as ethylene glycol, propylene glycol and butylene glycol are used as the glycol. Is preferably used.
- polyester examples include polyethylene terephthalate, polybutylene terephthalate, polypropylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polypropylene naphthalate, poly (1,4-cyclohexanedimethylene terephthalate) and the like. be able to.
- the dicarboxylic acid or its ester-forming derivative or glycol that can be used as a polyester raw material is not limited to the above examples, and the resulting polyester is not limited to the above examples. Absent.
- Polyesters represented by polyethylene terephthalate are usually produced by the following method. That is, first, a low molecular weight oligomer containing the bis (2-hydroxyethyl) terephthalate (BHET) is obtained by a direct esterification reaction between a dicarboxylic acid typified by terephthalic acid and a glycol typified by ethylene glycol. Further, this oligomer is melt polycondensed in the presence of a particulate titanic acid catalyst in a high vacuum and at a high temperature to obtain a polyester having a required molecular weight.
- BHET bis (2-hydroxyethyl) terephthalate
- BHET bis (2-hydroxyethyl) terephthalate
- the above-mentioned low molecular weight oligomer is transferred to a polycondensation reaction tank, and is usually heated under a reduced pressure at a temperature higher than the melting point of polyethylene terephthalate in the range of 240 to 280 ° C., for example, about 280 to 290 ° C. Then, while distilling off the unreacted ethylene glycol and the ethylene glycol produced by the reaction to the outside of the reaction system, and simultaneously monitoring the viscosity of the molten reaction product, the low molecular weight oligomer is melt polycondensed to obtain a polyester. .
- This polycondensation reaction may be carried out using a plurality of polycondensation reaction tanks, if necessary, while optimally changing the reaction temperature and pressure in each polycondensation reaction tank.
- the decompression is stopped, for example, the inside of the polycondensation reaction tank is returned to normal pressure with nitrogen gas, and the resulting polyester is discharged from the polycondensation reaction tank, for example, in the form of a strand. , Cooled rapidly with water, cut into pellets.
- a polyester having an intrinsic viscosity (IV) of 0.5 to 0.9 dL / g can be usually obtained in this manner.
- the polyester used for bottles is required to have a higher molecular weight than the polyester used for fibers and films.
- Such a higher molecular weight polyester can be usually obtained by solid-phase polycondensation of the polyester as the melt polycondensate, as already known.
- the particulate titanic acid catalyst described above may be used as the polycondensation catalyst in the conventional polyester producing method described above, and titanium nitride may be used in combination.
- the step of producing the low molecular weight oligomer containing the dicarboxylic acid diester by an esterification reaction or transesterification reaction of the dicarboxylic acid or its ester-forming derivative and glycol In a method for producing a polyester comprising a step of melt polycondensation of a molecular weight oligomer to obtain a polyester as a melt polycondensate, at least in the step of melt polycondensation of the oligomer of the two steps, a particulate titanate catalyst In the presence of titanium nitride, the oligomer is melt polycondensed to obtain a polyester as a melt polycondensate.
- the method of the present invention may further include a step of obtaining a polyester as a solid phase polycondensate by solid-phase polycondensation of the polyester as the melt polycondensate in the above-described polyester production method.
- the oligomer is usually melt polycondensed in the presence of a particulate titanic acid catalyst and titanium nitride to obtain a polyester as a melt polycondensate. Therefore, in the present invention, when the polyester as the melt polycondensate is further subjected to solid phase polycondensation, the polyester as the melt polycondensate already contains particulate titanate catalyst and titanium nitride. In the polycondensation, it is not necessary to newly use a particulate titanic acid catalyst and / or titanium nitride.
- a particulate titanic acid catalyst and / or titanium nitride may be newly added to the polyester to cause solid phase polycondensation.
- a polyester obtained by melt polycondensation may be melt-mixed with a particulate titanic acid catalyst and / or titanium nitride and subjected to solid phase polycondensation.
- the solid phase polycondensation of the polyester is performed by drying the polyester obtained by melt polycondensation at a temperature of 100 to 200 ° C. under vacuum or under a flow of inert gas or carbon dioxide, and then at a temperature of 150 to 200 ° C. Then, the polyester is heated to a temperature lower than the melting point of the polyester, typically about 200 to 230 ° C., to cause solid phase polycondensation.
- a polyester having an intrinsic viscosity (IV) of 0.7 to 1.2 dL / g can be usually obtained as a solid phase polycondensate in this manner.
- the particulate titanic acid catalyst and titanium nitride are used in the direct esterification reaction or transesterification reaction for the production of the oligomer containing bis (2-hydroxyethyl) terephthalate (BHET). It may be added to the reaction system.
- BHET bis (2-hydroxyethyl) terephthalate
- particulate titanic acid catalyst and titanium nitride may be mixed and added as they are to the reaction system.
- these are dispersed in glycol used as a raw material, and the reaction system It is preferable to add to.
- the particulate titanic acid catalyst to be used can be easily dispersed in glycol, particularly ethylene glycol, the particulate titanic acid catalyst and titanium nitride are previously dispersed in ethylene glycol to form a slurry,
- the oligomer is charged into a polycondensation reaction tank, heated and melted, the slurry is added thereto, and the oligomer is melt polycondensed.
- the amount of the particulate titanic acid catalyst and titanium nitride used in the step of melt polycondensation of the oligomer described above will be described.
- the particulate titanic acid catalyst is used in the range of 5 to 500 ppm by weight, preferably in the range of 10 to 500 ppm by weight, based on the polyester obtained.
- ppm means ppm by weight.
- the amount is less than 5 ppm with respect to the obtained polyester, the catalytic activity is not sufficient, and there is a possibility that the target high molecular weight polyester may not be obtained.
- the amount is more than 500 ppm with respect to the obtained polyester.
- the polyester obtained may be inferior in thermal stability.
- titanium nitride is usually used in an amount of 3 ppm or more, preferably 5 ppm or more in terms of titanium, based on the polyester obtained.
- the amount of titanium nitride used is less than 3 ppm in terms of titanium with respect to the obtained polyester, it is difficult to obtain a polyester having excellent target heat resistance.
- b * value does not increase even when heated by using titanium nitride of 3 ppm or more in terms of titanium with respect to the obtained polyester. Excellent polyester can be obtained.
- the polyester does not show further improvement in heat resistance commensurate with the amount of use, and on the contrary, the brightness of the polyester is lowered. It is used in the range of 50 ppm or less, preferably in the range of 30 ppm or less, more preferably in the range of 20 ppm or less.
- the L * value represents lightness
- the a * value and b * value represent chromaticity, that is, hue and saturation.
- the L * value indicates white as the value is large, and black as the value is small.
- the L * value for white is 100 and the L * value for black is 0.
- the b * value can take either a negative value or a positive value in this way, in the present invention, when the b * value changes from b 0 to b 1 , b 1 -b 0 is a positive value. It is expressed that the b * value has increased, and when b 1 -b 0 is a negative value, the b * value has decreased.
- the b * value is changed to -1.0 from 1.5
- the amount of change in the b * value ( ⁇ b *) is -2.5
- b * value is from 1.5 -1
- the change amount ( ⁇ b * ) of the b * value is ⁇ 3.0 when it is changed to .5, the b * value is expressed as being lower than the former in the latter case.
- the polyester obtained by the method of the present invention is heated, since the amount of change in b * value before and after heating ( ⁇ b * ) is not a positive value, as described above, it has excellent heat resistance, The hue is not enhanced yellow.
- the polyester as a melt polycondensate obtained by the method of the present invention has a negative change in b * value ( ⁇ b * ) after heating, as seen in the heat resistance test described below.
- the amount of change ( ⁇ b * ) in the b * value of the polyester as the solid phase polycondensation obtained by the method of the present invention is negative as compared with the polyester as the melt polycondensate. That is, when the polyester as the melt polycondensate is heated to obtain the polyester as the solid phase polycondensate, the change amount ( ⁇ b * ) of the b * value during that time is a negative value. Furthermore, the amount of change ( ⁇ b * ) in the b * value after heating is also a negative value for the polyester as the solid phase polycondensate.
- the polyester as the melt polycondensate is subjected to solid phase polycondensation, particularly when the particulate titanic acid catalyst has a titanic acid coating layer on the surface of the hydrotalcite particles.
- the solid phase polycondensation rate is higher than when only the particulate titanic acid catalyst is used, that is, the rate of increase in intrinsic viscosity per hour is higher.
- B * value is further decreased, and a higher molecular weight polyester having excellent color tone can be obtained.
- polycondensation catalysts such as antimony, germanium, cobalt, zinc, manganese, and the like can be used as long as the advantages of using the particulate titanic acid catalyst according to the present invention are not impaired.
- polycondensation may be carried out in the presence of a stabilizer, if necessary.
- the stabilizer can be added to the reaction system at any point in the polycondensation of the polyester raw material.
- the stabilizer include phosphates such as phosphoric acid, sodium phosphate and potassium phosphate, phosphate esters such as trimethyl phosphate, triethyl phosphate, tri-n-butyl phosphate and triphenyl phosphate, and methyl acid.
- Acid phosphates such as phosphate, ethyl acid phosphate, isopropyl acid phosphate, butyl acid phosphate, phosphorous acid, phosphites such as sodium phosphite and potassium phosphite, and phosphorous such as triphenyl phosphite Phosphorus compounds such as acid esters and polyphosphoric acid can be mentioned.
- These stabilizers are used as phosphorus in the range of 1 to 100 ppm, preferably 5 to 50 ppm, based on the polyester obtained.
- Reference example 1 (Preparation of hydrotalcite water slurry) A mixed solution of 2.6 L of a 3.8 mol / L aqueous magnesium sulfate solution and 2.6 L of a 0.85 mol / L aqueous aluminum sulfate solution, and 2.8 L of a 9.3 mol / L aqueous sodium hydroxide solution A mixed solution of 2.64 mol / L sodium carbonate aqueous solution with a concentration of 2.54 mol / L was simultaneously added to the reactor with stirring, and then hydrothermal reaction was performed at 180 ° C. for 2 hours.
- hydrotalcite having a composition of Mg 0.7 Al 0.3 (OH) 2 (CO 3 ) 0.15 ⁇ 0.48H 2 O 2 . .
- This hydrotalcite was suspended in water to obtain a hydrotalcite water slurry (123 g / L).
- Example 1 Preparation of particulate titanic acid catalyst A
- 9.0 L of hydrotalcite water slurry (123 g / L) obtained in Reference Example 1 was charged into a 25 L reactor.
- Titanium tetrachloride aqueous solution (Osaka Titanium Technologies, Ltd., 69.2 g / L in terms of TiO 2 ) 3.2 L and sodium hydroxide aqueous solution (Tokuyama Corp., 99.6 g / L in terms of NaOH) 3.2 L
- the mixture was aged for 1 hour to form a titanate coating layer on the surface of the hydrotalcite particles.
- the water slurry of hydrotalcite particles having a titanic acid coating layer on the surface thus obtained is filtered, the resulting cake is washed with water and dried, and the resulting dried product is crushed to form a surface.
- a particulate titanic acid catalyst A composed of hydrotalcite particles having a titanic acid coating layer was obtained.
- the ratio of titanic acid coating in the particulate titanic acid catalyst was 20 parts by weight in terms of TiO 2 with respect to 100 parts by weight of hydrotalcite.
- polyester a-1 (Production of polyester a-1) 500 g of bishydroxyethyl terephthalate (Pet Refine Technology Co., Ltd., hereinafter the same) is charged into a 1 L polycondensation reaction tank, heated with stirring under nitrogen gas flow, and the bishydroxyethyl terephthalate is melted. The temperature was raised to 240 ° C.
- particulate titanic acid catalyst A 50 ppm with respect to the obtained polyester, 5 ppm in terms of titanium
- titanium nitride having an average particle size of 0.15 ⁇ m manufactured by Wako Pure Chemical Industries, Ltd., hereinafter the same.
- 0025 g (6.5 ppm with respect to the obtained polyester, 5 ppm in terms of titanium) was previously dispersed in ethylene glycol to form a slurry, and this slurry was added to the reaction vessel, and 10 minutes later, 85 wt.
- the temperature of the reaction vessel is raised from 240 ° C. to 280 ° C. over 1 hour, and simultaneously, the pressure is reduced from normal pressure to 130 Pa over 1 hour, and the load applied to the agitator motor is maintained while maintaining this temperature and pressure.
- the melt polycondensation reaction was performed until a predetermined value was reached.
- the inside of the reaction tank is returned to normal pressure with nitrogen gas, and the obtained polyester in a molten state is discharged in the form of a strand from the outlet at the bottom of the reaction tank, cooled, cut and polyester a- 1 pellet was obtained.
- Table 1 shows the melt polycondensation time in the production of polyester by melt polycondensation of such bishydroxyethyl terephthalate, the intrinsic viscosity and the color tone of the obtained polyester.
- Heat resistance test of polyester a-1 As a heat resistance test, 50 g of the polyester a-1 pellets were placed in a magnetic dish, heated to 205 ° C. over 3 hours in the atmosphere using an electric furnace, and heated at this temperature for 16 hours. Table 2 shows the color tone of the polyester pellets before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- polyester a-2 (Production of polyester a-2) After charging 20 g of the raw material polyester a-1 pellets into a fixed bed flow reactor, the pellets were dried in a nitrogen stream at 160 ° C. for 4 hours and further crystallized at 190 ° C. for 1 hour. The polyester pellets thus treated were heated at 208 ° C. for 18 hours under a nitrogen stream and subjected to solid phase polycondensation of the polyester to obtain polyester a-2 pellets.
- Table 3 shows the color tone of -2 and the amount of change in b * value ( ⁇ b * ).
- the intrinsic viscosity difference ( ⁇ IV) is a value obtained by subtracting the intrinsic viscosity of the raw material polyester a-1 from the intrinsic viscosity of the polyester a-2 obtained by solid phase polycondensation.
- Example 2 (Production of polyester b-1 and its heat resistance test) In the melt polycondensation of bishydroxyethyl terephthalate, a pellet of polyester b-1 was prepared in the same manner as in Example 1 except that 0.0049 g of titanium nitride (13 ppm with respect to the obtained polyester, 10 ppm in terms of titanium) was used. Obtained. Table 1 shows the melt polymerization time in the production of such polyester, the intrinsic viscosity and the color tone of the obtained polyester.
- the polyester b-1 was subjected to a heat resistance test in the same manner as the polyester a-1, and the color tone of the polyester before and after the heat resistance test and the b * value change ( ⁇ b * ) before and after the heat resistance test are shown in Table 2. .
- polyester b-2 (Production of polyester b-2 and its heat resistance test)
- the polyester b-1 pellets were subjected to solid phase polycondensation in the same manner as in Example 1 to obtain polyester b-2 pellets.
- the polyester b-2 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 4 shows the color of the polyester before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- Example 3 (Production of polyester c-1 and its heat resistance test) In the melt polycondensation of bishydroxyethyl terephthalate, pellets of polyester c-1 were prepared in the same manner as in Example 1 except that 0.0098 g of titanium nitride (26 ppm based on the polyester obtained, 20 ppm in terms of titanium) was used. Obtained. Table 1 shows the melt polymerization time in the production of such polyester, the intrinsic viscosity and the color tone of the obtained polyester.
- the polyester c-1 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 2 shows the color tone of the polyester before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- polyester c-2 (Production of polyester c-2 and its heat resistance test)
- the polyester c-1 pellets were subjected to solid phase polycondensation in the same manner as in Example 1 to obtain polyester c-2 pellets.
- Table 3 shows the color tone and b * value variation ( ⁇ b * ).
- the polyester c-2 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 4 shows the color tone of the polyester before and after the heat resistance test and the amount of change in the b * value before and after the heat resistance test ( ⁇ b * ). Show.
- Example 4 Preparation of particulate titanic acid catalyst B
- Titanium tetrachloride aqueous solution (69.2 g / L in terms of TiO 2 ) and 3.2 L of sodium hydroxide aqueous solution (99.6 g / L in terms of NaOH) were simultaneously added to the titanium tetrachloride aqueous solution at a pH of 10.0. was added dropwise over 8 hours. After completion of dropping, the mixture was aged for 1 hour to form a titanate coating layer on the surface of the magnesium hydroxide particles.
- the aqueous slurry of magnesium hydroxide particles having a titanate coating layer on the surface thus obtained is filtered, the resulting cake is washed with water and dried, and the resulting dried product is crushed to form a surface.
- a particulate titanic acid catalyst B composed of magnesium hydroxide particles having a titanic acid coating layer was obtained.
- the ratio of the titanic acid coating in this particulate titanic acid catalyst was 20 parts by weight in terms of TiO 2 with respect to 100 parts by weight of magnesium hydroxide.
- polyester d-1 (Production of polyester d-1 and its heat resistance test) In the melt polycondensation of bishydroxyethyl terephthalate, 0.019 g of particulate titanic acid catalyst B (50 ppm with respect to the obtained polyester, 5 ppm in terms of titanium) and 0.0025 g of titanium nitride (6.5 ppm with respect to the obtained polyester) Polyester d-1 pellets were obtained in the same manner as in Example 1 except that 5 ppm in terms of titanium was used.
- Table 1 shows the melt polymerization time in the production of such a polyester, the intrinsic viscosity and the color tone of the obtained polyester.
- the polyester d-1 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 2 shows the color tone of the polyester before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- polyester d-2 (Production of polyester d-2 and its heat resistance test)
- the polyester d-1 pellets were subjected to solid phase polycondensation in the same manner as in Example 1 to obtain polyester d-2 pellets.
- Table 3 shows the color tone and b * value variation ( ⁇ b * ).
- the polyester d-2 was subjected to a heat test in the same manner as in Example 1.
- Table 4 shows the color tone of the polyester before and after such a heat test and the b * value change ( ⁇ b * ) before and after the heat test. Show.
- Example 5 (Production of polyester e-1 and its heat resistance test) In the melt polycondensation of bishydroxyethyl terephthalate, a pellet of polyester e-1 was prepared in the same manner as in Example 4 except that 0.0049 g of titanium nitride (13 ppm with respect to the obtained polyester, 10 ppm in terms of titanium) was used. Obtained. Table 1 shows the melt polymerization time in the production of such polyester, the intrinsic viscosity and the color tone of the obtained polyester.
- the polyester e-1 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 2 shows the color tone of the polyester before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- polyester e-2 (Production of polyester e-2 and its heat resistance test)
- the polyester e-1 pellets were subjected to solid phase polycondensation in the same manner as in Example 1 to obtain polyester e-2 pellets.
- Table 3 shows the color tone and b * value variation ( ⁇ b * ).
- the polyester e-2 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 4 shows the color of the polyester before and after the heat test and the amount of change in the b * value ( ⁇ b *) before and after the heat test.
- Example 6 (Production of polyester f-1 and its heat resistance test) In the melt polycondensation of bishydroxyethyl terephthalate, a pellet of polyester f-1 was prepared in the same manner as in Example 4 except that 0.0098 g of titanium nitride (26 ppm with respect to the obtained polyester, 20 ppm in terms of titanium) was used. Obtained. Table 1 shows the melt polymerization time in the production of such polyester, the intrinsic viscosity and the color tone of the obtained polyester.
- the polyester f-1 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 2 shows the color tone of the polyester before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- polyester f-2 (Production of polyester f-2 and its heat resistance test)
- the polyester f-1 pellets were subjected to solid phase polycondensation in the same manner as in Example 1 to obtain polyester f-2 pellets.
- Table 3 shows the color tone and b * value variation ( ⁇ b * ).
- the polyester f-2 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 4 shows the color of the polyester before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- Example 7 (Production of polyester k-1 and its heat resistance test) In the melt polycondensation of bishydroxyethyl terephthalate, in the same manner as in Example 1, except that 0.0015 g of titanium nitride (3.9 ppm with respect to the obtained polyester, 3 ppm in terms of titanium) was used, Pellets were obtained. Table 1 shows the melt polymerization time in the production of such polyester, the intrinsic viscosity and the color tone of the obtained polyester.
- the polyester k-1 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 2 shows the color tone of the polyester before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- polyester k-2 (Production of polyester k-2 and its heat resistance test)
- the polyester k-1 pellets were subjected to solid phase polycondensation in the same manner as in Example 1 to obtain polyester k-2 pellets.
- the polyester k-2 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 4 shows the color of the polyester before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- Example 8 (Production of polyester l-1 and its heat resistance test) In the melt polycondensation of bishydroxyethyl terephthalate, in the same manner as in Example 4 except that 0.0015 g of titanium nitride (3.9 ppm with respect to the obtained polyester, 3 ppm in terms of titanium) was used, Pellets were obtained. Table 1 shows the melt polymerization time in the production of such polyester, the intrinsic viscosity and the color tone of the obtained polyester.
- the polyester 1-1 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 2 shows the color tone of the polyester before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- polyester l-1 pellets were subjected to solid phase polycondensation in the same manner as in Example 1 to obtain polyester l-2 pellets.
- Table 3 shows the color tone and b * value variation ( ⁇ b * ).
- the polyester 1-2 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 4 shows the color of the polyester before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- Example 9 (Production of polyester m-1 and its heat resistance test) In melt polycondensation of bishydroxyethyl terephthalate, 0.008 g of particulate titanic acid catalyst A (20 ppm with respect to the obtained polyester, 2 ppm in terms of titanium), 0.0025 g of titanium nitride (6.5 ppm with respect to the obtained polyester) Polyester m-1 pellets were obtained in the same manner as in Example 1 except that 5 ppm in terms of titanium was used. Table 1 shows the melt polymerization time in the production of such polyester, the intrinsic viscosity and the color tone of the obtained polyester.
- the polyester m-1 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 2 shows the color tone of the polyester before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- polyester m-2 (Production of polyester m-2 and its heat resistance test)
- the polyester m-1 pellets were subjected to solid phase polycondensation in the same manner as in Example 1 to obtain polyester m-2 pellets.
- the polyester m-2 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 4 shows the color of the polyester before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- Example 10 (Production of polyester n-1 and its heat resistance test) In melt polycondensation of bishydroxyethyl terephthalate, 0.189 g of particulate titanic acid catalyst A (500 ppm with respect to the resulting polyester, 50 ppm in terms of titanium), 0.0098 g of titanium nitride (26 ppm with respect to the resulting polyester, titanium Polyester n-1 pellets were obtained in the same manner as in Example 1 except that 20 ppm in terms of conversion was used. Table 1 shows the melt polymerization time in the production of such polyester, the intrinsic viscosity and the color tone of the obtained polyester.
- the polyester n-1 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 2 shows the color tone of the polyester before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- polyester n-2 (Production of polyester n-2 and its heat resistance test)
- the polyester n-1 pellets were subjected to solid phase polycondensation in the same manner as in Example 1 to obtain polyester n-2 pellets.
- the polyester n-2 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 4 shows the color of the polyester before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- Comparative Example 1 (Production of polyester g-1 and its heat resistance test) In the melt polycondensation of bishydroxyethyl terephthalate, 0.019 g of particulate titanic acid catalyst A (50 ppm with respect to the resulting polyester, 5 ppm in terms of titanium) was used, except that titanium nitride was not used. In the same manner as in Example 1, polyester g-1 pellets were obtained. Table 1 shows the melt polymerization time in the production of such polyester, the intrinsic viscosity and the color tone of the obtained polyester.
- the polyester g-1 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 2 shows the color tone of the polyester before and after the heat test and the change ( ⁇ b * ) in the color tone b * before and after the heat test.
- polyester g-2 (Production of polyester g-2 and its heat resistance test)
- the polyester g-1 pellets were subjected to solid phase polycondensation in the same manner as in Example 1 to obtain polyester g-2 pellets.
- Intrinsic viscosity and intrinsic viscosity difference between the raw material polyester g-1 and the polyester g-2 obtained by the solid phase polycondensation thereof, and the raw material polyester g-1 and the polyester g-2 obtained by the solid phase polycondensation thereof, respectively.
- Table 3 shows the color tone and b * value variation ( ⁇ b * ).
- the polyester g-2 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 4 shows the color of the polyester before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- Comparative Example 2 (Production of polyester h-1 and its heat resistance test) In the melt polycondensation of bishydroxyethyl terephthalate, 0.019 g of particulate titanic acid catalyst B (50 ppm with respect to the resulting polyester, 5 ppm in terms of titanium) was used, except that titanium nitride was not used. In the same manner as in Example 4, pellets of polyester h-1 were obtained. Table 1 shows the melt polymerization time in the production of such polyester, the intrinsic viscosity and the color tone of the obtained polyester.
- the polyester h-1 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 2 shows the color tone of the polyester before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- polyester h-2 (Production of polyester h-2 and its heat resistance test)
- the polyester h-1 pellets were subjected to solid phase polycondensation in the same manner as in Example 1 to obtain polyester h-2 pellets.
- Table 3 shows the color tone and b * value variation ( ⁇ b * ).
- the polyester h-2 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 4 shows the color of the polyester before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- polyester i-1 was prepared in the same manner as in Example 1 except that 0.049 g of titanium nitride (130 ppm with respect to the resulting polyester, 100 ppm in terms of titanium) was used as the catalyst. Pellets were obtained. Table 1 shows the melt polymerization time, the intrinsic viscosity, and the color tone of the obtained polyester.
- the polyester i-1 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 2 shows the color tone of the polyester before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- polyester i-2 (Production of polyester i-2 and its heat resistance test)
- the polyester i-1 pellets were subjected to solid phase polycondensation in the same manner as in Example 1 to obtain polyester i-2 pellets.
- Table 3 shows the color tone and b * value variation ( ⁇ b * ).
- the polyester i-2 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 4 shows the color of the polyester before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- Comparative Example 4 (Method for producing polyester j-1) In the melt polycondensation of bishydroxyethyl terephthalate, 0.019 g of particulate titanic acid catalyst A (50 ppm with respect to the obtained polyester, 5 ppm in terms of titanium) is used instead of titanium nitride. Polyester j-1 pellets were obtained in the same manner as in Example 1 except that 0.0006 g of Blue 104 (1.5 ppm based on the obtained polyester) was used. Table 1 shows the melt polymerization time, the intrinsic viscosity, and the color tone of the obtained polyester.
- the polyester j-1 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 2 shows the color tone of the polyester before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- polyester j-2 (Production of polyester j-2 and its heat resistance test)
- the polyester j-1 pellets were subjected to solid phase polycondensation in the same manner as in Example 1 to obtain polyester j-2 pellets.
- Table 3 shows the color tone and b * value variation ( ⁇ b * ).
- the polyester j-2 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 4 shows the color of the polyester before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- Comparative Example 5 (Production of polyester o-1 and its heat resistance test) In the melt polycondensation of bishydroxyethyl terephthalate, 0.189 g of particulate titanic acid catalyst A (500 ppm with respect to the obtained polyester, 50 ppm in terms of titanium) was used, except that titanium nitride was not used. In the same manner as in Example 1, polyester o-1 pellets were obtained. Table 1 shows the melt polymerization time in the production of such polyester, the intrinsic viscosity and the color tone of the obtained polyester.
- the polyester o-1 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 2 shows the color tone of the polyester before and after the heat test and the change ( ⁇ b * ) in the color tone b * before and after the heat test.
- polyester o-2 (Production of polyester o-2 and its heat resistance test)
- the polyester o-1 pellets were subjected to solid phase polycondensation in the same manner as in Example 1 to obtain polyester o-2 pellets.
- Table 3 shows the color tone and b * value variation ( ⁇ b * ).
- the polyester o-2 was subjected to a heat resistance test in the same manner as in Example 1.
- Table 4 shows the color of the polyester before and after the heat test and the amount of change ( ⁇ b * ) in the b * value before and after the heat test.
- the values in the columns for catalyst content and TiN content are respectively the amount of catalyst and TiN (ppm) for the resulting polyester, and the values in parentheses for the catalyst content and TiN content columns are for the resulting polyester, respectively. It is the amount (ppm) of the catalyst and TiN in terms of titanium.
- the numerical value in the column of the color tone content is the amount (ppm) relative to the obtained polyester.
- Examples 1 to 3, 7, 9, and 10 were conducted in the presence of hydrotalcite particles (particulate titanate catalyst A) having a titanate coating layer on the surface as a particulate titanate catalyst and titanium nitride.
- Polyester was obtained by melt polycondensation of bishydroxyethyl terephthalate.
- Examples 4 to 6 and 8 are magnesium hydroxide particles (particulate titanate) having a titanate coating layer on the surface as a particulate titanate catalyst. Polyester was obtained by melt polycondensation of bishydroxyethyl terephthalate in the presence of catalyst B) and titanium nitride.
- Example 7 is compared with Comparative Example 1
- Examples 8, 4, 5 and 6 are compared with Comparative Example 2
- Example 10 is compared with Comparative Example 5.
- the polyester obtained has a b * value as compared with the respective comparative examples not using titanium nitride in combination.
- the b * value is further decreased as the amount of titanium nitride is increased. Therefore, in the production of a polyester using a particulate titanic acid catalyst, titanium nitride functions as a hue adjuster that reduces yellowishness or enhances blueness in the obtained polyester, as is conventionally known. .
- the b * value after the heat test is significantly lower than the b * value before the heat test, and the amount of titanium nitride used in combination with the particulate titanate catalyst is small.
- the b * value of the resulting polyester pellets further decreases.
- the b * value of the obtained polyester pellets is further lowered.
- the b * value of the obtained polyester pellets is further lowered.
- the polyester pellets obtained by using only the particulate titanic acid catalyst without the combined use of titanium nitride had a b * value after the heat test as shown in Comparative Examples 1 and 2. Compared to before, it was only slightly increased or slightly decreased, and in any case, there was no significant decrease. Therefore, according to this invention, it is shown that the heat resistance when the polyester pellet obtained by using a particulate titanic acid catalyst and titanium nitride together is heated is improved.
- Table 1 the polyester pellets as melt polycondensates obtained in the respective examples and comparative examples were subjected to solid phase polycondensation to obtain polyester pellets as solid phase polycondensates, respectively.
- Table 3 shows the color tone and the b * value variation (( ⁇ b * )) of the polyester pellets as the melt polycondensate and the polyester pellets as the solid phase polycondensate.
- Polyester pellets obtained by solid-phase polycondensation using only a particulate titanic acid catalyst without using titanium nitride together, as shown in Comparative Examples 1 and 2, are polyester pellets as a melt polycondensate as a raw material. In both cases, the b * values are somewhat reduced.
- the polyester pellets obtained by solid phase polycondensation using a particulate titanate catalyst and titanium nitride in combination are polyester pellets as melt polycondensates in any of Examples 1 to 10.
- b * values are significantly reduced, moreover, the larger the amount of titanium nitride, the b * value is reduced more by heating for solid phase polycondensation, the heat resistance It is recognized that it has improved.
- the polyester as the solid phase polycondensate has a lower b * value compared to the polyester pellets as the melt polycondensate.
- the polyester as the solid phase polycondensate has a lower b * value than the polyester pellets as the melt polycondensate.
- the polyester pellets obtained by melt polycondensation are subjected to solid-phase polycondensation in the presence of particulate titanate catalyst and titanium nitride, as seen in Examples 1 to 3 and 7 for Comparative Example 1,
- the intrinsic viscosity of the solid-phase polycondensate is higher than when not using titanium nitride.
- the difference from the intrinsic viscosity of the melt polycondensate, that is, the intrinsic viscosity difference ( ⁇ IV) is large. That is, the rate of increase in intrinsic viscosity per unit time is high.
- Table 4 shows the results of a heat resistance test performed on the polyester obtained by solid phase polycondensation in the same manner as described above.
- Comparative Examples 1 and 2 each have a hydrotalcite particle having a titanic acid coating layer on the surface as a particulate titanic acid catalyst and a titanic acid coating layer on the surface as a particulate titanic acid catalyst without using titanium nitride in combination.
- Using magnesium hydroxide particles bishydroxyethyl terephthalate is melt polycondensed to obtain a polyester, which is solid-phase polycondensed to obtain a polyester, and this polyester was subjected to a heat resistance test.
- Examples 1 to 3 and 7 were obtained by melt polycondensation of bishydroxyethyl terephthalate in the presence of hydrotalcite particles having a titanic acid coating layer on the surface and titanium nitride as a particulate titanic acid catalyst.
- a polyester is obtained by solid-phase polycondensation, and a heat resistance test is performed on the polyester.
- Examples 4 to 6 and 8 were obtained by melt polycondensation of bishydroxyethyl terephthalate in the presence of magnesium hydroxide particles having a titanic acid coating layer on the surface and titanium nitride as a particulate titanic acid catalyst.
- a polyester is obtained by solid-phase polycondensation, and a heat resistance test is performed on the polyester.
- polyester pellets as solid phase polycondensates have a positive change in b * value before and after the heat resistance test. Has an enhanced yellow color.
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Abstract
Description
TiO2 ・nH2O
(式中、nは0<n≦2を満たす数である。)
で表される含水酸化チタンであって、このようなチタン酸は、例えば、後述するように、ある種のチタン化合物を分解することによって得ることができる。
M2+ 1-xM3+ x(OH-)2An- x/n・mH2O …(I)
(式中、M2+はMg2+、Zn2+及びCu2+から選ばれる少なくとも1種の2価金属イオンを示し、M3+はAl3+、Fe3+及びTi3+から選ばれる少なくとも1種の3価金属イオンを示し、An- はSO4 2-、Cl-、CO3 2- 及びOH- から選ばれる少なくとも1種のアニオンを示し、nは上記アニオンの価数を示し、xは0<x<0.5を満足する数であり、mは0≦m<2を満足する数である。)
で表される。
Mg2+ 1-xAl3+ x(OH-)2(CO3 2-)x/2・mH2O …(II)
(式中、x及びmは前記と同じである。)
で表されるハイドロタルサイトが好ましく用いられる。
(ハイドロタルサイトの水スラリーの調製)
3.8モル/L濃度の硫酸マグネシウム水溶液2.6Lと0.85モル/L濃度の硫酸アルミニウム水溶液2.6Lとの混合溶液と9.3モル/L濃度の水酸化ナトリウム水溶液2.8Lと2.54モル/L濃度の炭酸ナトリウム水溶液2.6Lとの混合溶液を攪拌下に同時に反応器に加えた後、180℃で2時間水熱反応を行った。反応終了後、得られたスラリーを濾過、水洗した後、乾燥、粉砕して、Mg0.7 Al0.3 (OH)2 (CO3)0.15・0.48H2O なる組成を有するハイドロタルサイトを得た。このハイドロタルサイトを水に懸濁させて、ハイドロタルサイトの水スラリー(123g/L)を得た。
(水酸化マグネシウムの水スラリーの調製)
水5Lを反応器に仕込み、これに4モル/Lの塩化マグネシウム水溶液16.7Lと14.3モル/Lの水酸化ナトリウム水溶液8.4Lとを撹拌下に同時に加えた後、170℃で0.5時間水熱反応を行った。このようにして得られた水酸化マグネシウムを濾過、水洗し、得られたケーキを水に再び懸濁させて、水酸化マグネシウムの水スラリー(123g/L)を得た。
(粒子状チタン酸触媒Aの調製)
参考例1で得られたハイドロタルサイトの水スラリー(123g/L)9.0Lを25L容量の反応器に仕込んだ。四塩化チタン水溶液((株)大阪チタニウムテクノロジーズ製、TiO2 換算で69.2g/L)3.2Lと水酸化ナトリウム水溶液((株)トクヤマ製、NaOH換算で99.6g/L)3.2Lを同時に上記ハイドロタルサイトの水スラリーにそのpHが9.0になるように8時間かけて滴下した。滴下終了後、1時間熟成して、ハイドロタルサイト粒子の表面にチタン酸被覆層を形成した。
ビスヒドロキシエチルテレフタレート(ペットリファインテクノロジー(株)製、以下、同じ)500gを1L重縮合反応槽に仕込み、窒素ガス流通下、撹拌しながら、加熱して、上記ビスヒドロキシエチルテレフタレートを溶融させ、更に、240℃まで昇温した。
耐熱試験として、上記ポリエステルa-1のペレット50gを磁性皿に入れ、大気中、電気炉を用いて、3時間かけて、205℃まで昇温し、この温度で16時間、加熱した。このような耐熱試験前後のポリエステルのペレットの色調と耐熱試験前後のb* 値の変化量(△b*)を表2に示す。
上記原料ポリエステルa-1のペレット20gを固定床流通反応器に仕込んだ後、窒素気流下、160℃で4時間かけて乾燥させ、更に、190℃で1時間かけて結晶化させた。このように処理したポリエステルのペレットを窒素気流下、208℃で18時間加熱し、ポリエステルの固相重縮合を行って、ポリエステルa-2のペレットを得た。
上記ポリエステルa-2について、上記ポリエステルa-1の耐熱試験と同じ方法によって耐熱試験を行った。このような耐熱試験前後のポリエステルの色調と耐熱試験前後のb* 値の変化量(△b*)を表4に示す。
(ポリエステルb-1の製造とその耐熱試験)
ビスヒドロキシエチルテレフタレートの溶融重縮合において、窒化チタン0.0049g(得られるポリエステルに対して13ppm、チタン換算で10ppm)を用いた以外は、実施例1と同様にして、ポリエステルb-1のペレットを得た。このようなポリエステルの製造における溶融重合時間、得られたポリエステルの固有粘度及び色調を表1に示す。
上記ポリエステルb-1のペレットを実施例1と同様にして固相重縮合させて、ポリエステルb-2のペレットを得た。
(ポリエステルc-1の製造とその耐熱試験)
ビスヒドロキシエチルテレフタレートの溶融重縮合において、窒化チタン0.0098g(得られるポリエステルに対して26ppm、チタン換算で20ppm)を用いた以外は、実施例1と同様にして、ポリエステルc-1のペレットを得た。このようなポリエステルの製造における溶融重合時間、得られたポリエステルの固有粘度及び色調を表1に示す。
上記ポリエステルc-1のペレットを実施例1と同様にして固相重縮合させて、ポリエステルc-2のペレットを得た。
(粒子状チタン酸触媒Bの調製)
参考例2で得られた水酸化マグネシウムの水スラリー(123g/L)9.0Lを25L容量の反応器に仕込んだ。四塩化チタン水溶液(TiO2 換算で69.2g/L)3.2Lと水酸化ナトリウム水溶液(NaOH換算で99.6g/L)3.2Lを同時に上記四塩化チタン水溶液にそのpHが10.0になるように8時間かけて滴下した。滴下終了後、1時間熟成して、水酸化マグネシウム粒子の表面にチタン酸被覆層を形成した。
ビスヒドロキシエチルテレフタレートの溶融重縮合において、粒子状チタン酸触媒Bの0.019g(得られるポリエステルに対して50ppm、チタン換算で5ppm)と窒化チタン0.0025g(得られるポリエステルに対して6.5ppm、チタン換算で5ppm)を用いた以外は、実施例1と同様にして、ポリエステルd-1のペレットを得た。
上記ポリエステルd-1のペレットを実施例1と同様にして固相重縮合させて、ポリエステルd-2のペレットを得た。
(ポリエステルe-1の製造とその耐熱試験)
ビスヒドロキシエチルテレフタレートの溶融重縮合において、窒化チタン0.0049g(得られるポリエステルに対して13ppm、チタン換算で10ppm)を用いた以外は、実施例4と同様にして、ポリエステルe-1のペレットを得た。このようなポリエステルの製造における溶融重合時間、得られたポリエステルの固有粘度及び色調を表1に示す。
上記ポリエステルe-1のペレットを実施例1と同様にして固相重縮合させて、ポリエステルe-2のペレットを得た。
(ポリエステルf-1の製造とその耐熱試験)
ビスヒドロキシエチルテレフタレートの溶融重縮合において、窒化チタン0.0098g(得られるポリエステルに対して26ppm、チタン換算で20ppm)を用いた以外は、実施例4と同様にして、ポリエステルf-1のペレットを得た。このようなポリエステルの製造における溶融重合時間、得られたポリエステルの固有粘度及び色調を表1に示す。
上記ポリエステルf-1のペレットを実施例1と同様にして固相重縮合させて、ポリエステルf-2のペレットを得た。
(ポリエステルk-1の製造とその耐熱試験)
ビスヒドロキシエチルテレフタレートの溶融重縮合において、窒化チタン0.0015g(得られるポリエステルに対して3.9ppm、チタン換算で3ppm)を用いた以外は、実施例1と同様にして、ポリエステルk-1のペレットを得た。このようなポリエステルの製造における溶融重合時間、得られたポリエステルの固有粘度及び色調を表1に示す。
上記ポリエステルk-1のペレットを実施例1と同様にして固相重縮合させて、ポリエステルk-2のペレットを得た。
(ポリエステルl-1の製造とその耐熱試験)
ビスヒドロキシエチルテレフタレートの溶融重縮合において、窒化チタン0.0015g(得られるポリエステルに対して3.9ppm、チタン換算で3ppm)を用いた以外は、実施例4と同様にして、ポリエステルl-1のペレットを得た。このようなポリエステルの製造における溶融重合時間、得られたポリエステルの固有粘度及び色調を表1に示す。
上記ポリエステルl-1のペレットを実施例1と同様にして固相重縮合させて、ポリエステルl-2のペレットを得た。
(ポリエステルm-1の製造とその耐熱試験)
ビスヒドロキシエチルテレフタレートの溶融重縮合において、粒子状チタン酸触媒Aの0.008g(得られるポリエステルに対して20ppm、チタン換算で2ppm)、窒化チタン0.0025g(得られるポリエステルに対して6.5ppm、チタン換算で5ppm)を用いた以外は、実施例1と同様にして、ポリエステルm-1のペレットを得た。このようなポリエステルの製造における溶融重合時間、得られたポリエステルの固有粘度及び色調を表1に示す。
上記ポリエステルm-1のペレットを実施例1と同様にして固相重縮合させて、ポリエステルm-2のペレットを得た。
(ポリエステルn-1の製造とその耐熱試験)
ビスヒドロキシエチルテレフタレートの溶融重縮合において、粒子状チタン酸触媒Aの0.189g(得られるポリエステルに対して500ppm、チタン換算で50ppm)、窒化チタン0.0098g(得られるポリエステルに対して26ppm、チタン換算で20ppm)を用いた以外は、実施例1と同様にして、ポリエステルn-1のペレットを得た。このようなポリエステルの製造における溶融重合時間、得られたポリエステルの固有粘度及び色調を表1に示す。
上記ポリエステルn-1のペレットを実施例1と同様にして固相重縮合させて、ポリエステルn-2のペレットを得た。
(ポリエステルg-1の製造とその耐熱試験)
ビスヒドロキシエチルテレフタレートの溶融重縮合において、粒子状チタン酸触媒Aの0.019g(得られるポリエステルに対して50ppm、チタン換算で5ppm)を用いたが、窒化チタンを用いなかった以外は、実施例1と同様にして、ポリエステルg-1のペレットを得た。このようなポリエステルの製造における溶融重合時間、得られたポリエステルの固有粘度及び色調を表1に示す。
上記ポリエステルg-1のペレットを実施例1と同様にして固相重縮合させて、ポリエステルg-2のペレットを得た。
(ポリエステルh-1の製造とその耐熱試験)
ビスヒドロキシエチルテレフタレートの溶融重縮合において、粒子状チタン酸触媒Bの0.019g(得られるポリエステルに対して50ppm、チタン換算で5ppm)を用いたが、窒化チタンを用いなかった以外は、実施例4と同様にして、ポリエステルh-1のペレットを得た。このようなポリエステルの製造における溶融重合時間、得られたポリエステルの固有粘度及び色調を表1に示す。
上記ポリエステルh-1のペレットを実施例1と同様にして固相重縮合させて、ポリエステルh-2のペレットを得た。
(ポリエステルi-1の製造とその耐熱試験)
ビスヒドロキシエチルテレフタレートの溶融重縮合において、触媒として、窒化チタン0.049g(得られるポリエステルに対して130ppm、チタン換算で100ppm)を用いた以外は、実施例1と同様にして、ポリエステルi-1のペレットを得た。このようなポリエステルの製造における溶融重合時間、得られたポリエステルの固有粘度、色調を表1に示す。
上記ポリエステルi-1のペレットを実施例1と同様にして固相重縮合させて、ポリエステルi-2のペレットを得た。
(ポリエステルj-1の製造方法)
ビスヒドロキシエチルテレフタレートの溶融重縮合において、粒子状チタン酸触媒Aの0.019g(得られるポリエステルに対して50ppm、チタン換算で5ppm)と共に、窒化チタンに代えて、青色色調調整剤であるソルベント・ブルー104の0.0006g(得られるポリエステルに対して1.5ppm)を用いた以外は、実施例1と同様にして、ポリエステルj-1のペレットを得た。このようなポリエステルの製造における溶融重合時間、得られたポリエステルの固有粘度、色調を表1に示す。
上記ポリエステルj-1のペレットを実施例1と同様にして固相重縮合させて、ポリエステルj-2のペレットを得た。
(ポリエステルo-1の製造とその耐熱試験)
ビスヒドロキシエチルテレフタレートの溶融重縮合において、粒子状チタン酸触媒Aの0.189g(得られるポリエステルに対して500ppm、チタン換算で50ppm)を用いたが、窒化チタンを用いなかった以外は、実施例1と同様にして、ポリエステルo-1のペレットを得た。このようなポリエステルの製造における溶融重合時間、得られたポリエステルの固有粘度及び色調を表1に示す。
上記ポリエステルo-1のペレットを実施例1と同様にして固相重縮合させて、ポリエステルo-2のペレットを得た。
Claims (5)
- ジカルボン酸又はそのエステル形成性誘導体とグリコールとのエステル化反応又はエステル交換反応によって、ジカルボン酸ジエステルを含むオリゴマーを製造する工程と、次いで、このオリゴマーを溶融重縮合させて溶融重縮合物としてのポリエステルを得る工程を含むポリエステルの製造方法において、上記2つの工程のうち、少なくとも上記オリゴマーを溶融重縮合させる工程において、窒化チタンと重縮合触媒としての表面にチタン酸被覆層を有する固体塩基粒子との存在下に上記オリゴマーを溶融重縮合させて、溶融重縮合物としてのポリエステルを得ることを特徴とするポリエステルの製造方法。
- 更に、上記溶融重縮合物としてのポリエステルを固相重縮合させて、固相重縮合物としてのポリエステルを得る工程を含む請求項1に記載のポリエステルの製造方法。
- ジカルボン酸が芳香族ジカルボン酸であり、グリコールがアルキレングリコールであり、ジカルボン酸ジエステルを含むオリゴマーが芳香族ジカルボン酸ビス(ヒドロキシルアルキル)エステルを含むオリゴマーである請求項1に記載のポリエステルの製造方法。
- 固体塩基が水酸化マグネシウム又はハイドロタルサイトである請求項1に記載のポリエステルの製造方法。
- 得られるポリエステルに対して窒化チタンをチタン換算で3ppm以上存在させる請求項1に記載のポリエステルの製造方法。
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JP2015537957A JP6361662B2 (ja) | 2013-09-20 | 2014-09-18 | ポリエステルの製造方法 |
EP14845567.8A EP3048125A4 (en) | 2013-09-20 | 2014-09-18 | Polyester production method |
BR112016005666-3A BR112016005666B1 (pt) | 2013-09-20 | 2014-09-18 | método para a produção de poliéster |
US15/022,226 US20160229953A1 (en) | 2013-09-20 | 2014-09-18 | Method for producing polyester |
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CN201480051646.0A CN105745249B (zh) | 2013-09-20 | 2014-09-18 | 聚酯的制备方法 |
CA2924031A CA2924031A1 (en) | 2013-09-20 | 2014-09-18 | Method for the preparation of a polyester using titanium nitride and a particulate titanic acid catalyst |
KR1020167008164A KR20160060658A (ko) | 2013-09-20 | 2014-09-18 | 폴리에스테르의 제조 방법 |
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WO2017002852A1 (ja) * | 2015-06-30 | 2017-01-05 | 株式会社クラレ | 結晶ポリエステルペレット、その用途及びその製造方法 |
WO2019124166A1 (ja) * | 2017-12-22 | 2019-06-27 | 堺化学工業株式会社 | ポリエステル製造用重縮合触媒とそれを用いるポリエステルの製造 |
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JPWO2017002852A1 (ja) * | 2015-06-30 | 2018-04-19 | 株式会社クラレ | 結晶ポリエステルペレット、その用途及びその製造方法 |
WO2019124166A1 (ja) * | 2017-12-22 | 2019-06-27 | 堺化学工業株式会社 | ポリエステル製造用重縮合触媒とそれを用いるポリエステルの製造 |
US11612882B2 (en) | 2017-12-22 | 2023-03-28 | Sakai Chemical Industry Co., Ltd. | Polycondensation catalyst for producing polyester and production of polyester using the same |
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JPWO2015041271A1 (ja) | 2017-03-02 |
CN105745249B (zh) | 2018-03-13 |
SG11201601698UA (en) | 2016-04-28 |
TW201520242A (zh) | 2015-06-01 |
TWI651337B (zh) | 2019-02-21 |
BR112016005666B1 (pt) | 2021-03-09 |
EP3048125A1 (en) | 2016-07-27 |
CA2924031A1 (en) | 2015-03-26 |
EP3048125A4 (en) | 2017-05-17 |
JP6361662B2 (ja) | 2018-07-25 |
US20160229953A1 (en) | 2016-08-11 |
KR20160060658A (ko) | 2016-05-30 |
CN105745249A (zh) | 2016-07-06 |
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