WO2009119825A1 - ポリマーの精製方法およびそれを用いたポリマーの製造方法 - Google Patents
ポリマーの精製方法およびそれを用いたポリマーの製造方法 Download PDFInfo
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- WO2009119825A1 WO2009119825A1 PCT/JP2009/056347 JP2009056347W WO2009119825A1 WO 2009119825 A1 WO2009119825 A1 WO 2009119825A1 JP 2009056347 W JP2009056347 W JP 2009056347W WO 2009119825 A1 WO2009119825 A1 WO 2009119825A1
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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
- C08G63/88—Post-polymerisation treatment
- C08G63/90—Purification; Drying
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F6/00—Post-polymerisation treatments
- C08F6/001—Removal of residual monomers by physical means
- C08F6/005—Removal of residual monomers by physical means from solid polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F6/00—Post-polymerisation treatments
- C08F6/02—Neutralisation of the polymerisation mass, e.g. killing the catalyst also removal of catalyst residues
Definitions
- the present invention relates to a method for purifying a polymer in which a catalyst used in a polymerization reaction remains and a method for producing a polymer using the same.
- a synthetic polymer is generally synthesized by a polymerization reaction in the presence of a catalyst.
- the catalyst used in the polymerization reaction may remain in the synthesized polymer.
- the catalyst for example, a metal such as tin or a compound containing the metal is used, and depending on the type of the catalyst, some may affect the human body or the environment due to toxicity or the like.
- the polymer used in the medical field as described above there is a concern about the influence on the human body. Therefore, it is very important to reduce the amount of catalyst remaining in the synthetic polymer.
- the conventional method using an aqueous solvent has a problem that, for example, the catalyst cannot be removed sufficiently. Further, when an organic solvent containing an acid such as hydrochloric acid, nitric acid, sulfuric acid or the like is used, for example, even if the catalyst can be sufficiently removed, the molecular weight of the polymer is significantly reduced accordingly. It became clear by.
- an object of the present invention is to provide a polymer purification method capable of suppressing a decrease in the molecular weight of the polymer and effectively reducing the residual catalyst of the polymer.
- the method for purifying a polymer according to the present invention is a method for purifying a polymer containing a residual catalyst, and includes a catalyst removal step in which the polymer is brought into contact with a solvent for removing a catalyst containing an organic solvent containing an organic acid. It is characterized by being an organic acid in the range of pKa 2 to 3.9.
- the method for producing the polymer of the present invention includes the method for purifying the polymer of the present invention.
- the purification method of the present invention it is possible to suppress a decrease in the molecular weight of the polymer and to effectively reduce the residual catalyst of the polymer. For this reason, the influence on a human body or the environment can be suppressed, and in particular, the safety of a polymer used in the medical field can be sufficiently improved.
- the amount of residual catalyst in the polymer to be subjected to purification treatment (hereinafter also referred to as “crude polymer”) is not particularly limited.
- the amount of catalyst used in the synthesis stage is not limited, and the polymerization reaction time can be shortened to an extremely short time by increasing the catalyst amount. Therefore, according to the present invention, as described above, it is possible to reduce the residual catalyst while avoiding the problem of lowering the molecular weight. Further, by establishing the purification method of the present invention, the catalyst conditions in the polymer synthesis stage can be reduced. This restriction can be relaxed.
- the present invention is a method for purifying a polymer containing a residual catalyst, comprising a catalyst removal step of contacting the polymer with a catalyst removal solvent containing an organic acid, wherein the organic acid is pKa2-3. It is characterized by being an organic acid in the range of .9.
- the organic acid to be used is not particularly limited as long as its pKa is 2 to 3.9.
- fills said pKa if it is an expert, a specific substance can be mention
- lactic acid is particularly preferable.
- One type of these organic acids may be used, or two or more types may be used in combination.
- the method for contacting the polymer with the catalyst removing solvent is not particularly limited. Specifically, for example, a method of immersing the polymer in the solvent can be mentioned. In this case, the immersion of the polymer may be performed, for example, in a stationary state or with stirring. Examples of the contact method include a method of flowing the solvent through a column filled with the polymer. In this case, the solvent may be circulated through the column.
- the polymer means a polymer synthesized by a polymerization reaction.
- the polymer to be treated is not limited at all, but the purpose is to remove the polymer in which impurities remain (hereinafter also referred to as “crude polymer”), particularly the residual catalyst used in the polymerization reaction as described above. Therefore, it is preferable to apply the present invention to the polymer in which the catalyst remains.
- application to a polymer in which residual catalyst is a problem is preferable.
- it is used in a living body such as a biodegradable polymer (bioabsorbable polymer) or in contact with a living body. Examples thereof include polymers.
- the catalyst examples include metals and metal compounds, and examples of the metal include tin, zinc, titanium, zirconium, antimony, and iron.
- the metal include tin, zinc, titanium, zirconium, antimony, and iron.
- tin, a metal compound containing tin, and the like particularly have a problem of remaining in the polymer as described above. Therefore, it is preferable to apply the present invention to a polymer containing such a catalyst.
- the amount of residual catalyst in the polymer (crude polymer) subjected to purification treatment is not particularly limited as described above. According to the present invention, for example, 1000 wt.
- polymers containing about ppm residual catalyst for example, 10 wt. ppm or less, preferably 5 wt. It can be reduced to ppm or less.
- the polymer may be, for example, a homopolymer composed of one type of monomer or a copolymer (copolymer) composed of two or more types of monomers.
- the type of the polymerization reaction is not limited at all, and any of chain polymerization, sequential polymerization or living polymerization; condensation polymerization or addition polymerization; radical polymerization, ionic polymerization, coordination polymerization; Further, the polymerization type of the copolymer is not limited at all, and may be any of a random copolymer, an alternating copolymer, a block copolymer, a graft copolymer, and the like.
- polystyrene resin examples include, for example, polyester, and specific examples include, for example, L-lactide, D-lactide, D, L-lactide, ⁇ -caprolactone, ⁇ -butyrolactone, ⁇ -valerolactone, glycolic acid. Or the polymer which uses trimethylene carbonate, paradioxanone, etc. as a raw material is mention
- P (LA / CL) a copolymer of lactic acid and caprolactone
- P (LA / CL) a copolymer of lactic acid and caprolactone
- P (LA / CL) can be usually synthesized by copolymerizing in the presence of a catalyst using lactide (a cyclic dimer of lactic acid) and caprolactone as starting materials. It can also be synthesized by synthesizing lactide from lactic acid and copolymerizing with caprolactone in the presence of a catalyst.
- lactide a cyclic dimer of lactic acid
- caprolactone as starting materials. It can also be synthesized by synthesizing lactide from lactic acid and copolymerizing with caprolactone in the presence of a catalyst.
- tin, zinc, titanium, zirconium, antimony, iron or the like is usually used as the catalyst.
- the purification method of the present invention is particularly preferably applied to the purification of P (LA / CL), which is considered useful as a medical material.
- lactide examples include L-lactide, D-lactide, and a mixture thereof (D, L-lactide).
- lactic acid examples include L-lactic acid, D-lactic acid, and a mixture thereof (D , L-lactic acid).
- caprolactone examples include ⁇ -caprolactone, ⁇ -caprolactone, and ⁇ -caprolactone.
- the molecular weight of P (LA / CL) is not particularly limited, and can be determined as appropriate according to its use. For example, when decomposing in a living body after a lapse of a predetermined period, it can be appropriately determined according to the length of the predetermined period. Thus, when used in vivo, the weight average molecular weight is generally 1 ⁇ 10 4 to 1 ⁇ 10 6 , and preferably 1 ⁇ 10 5 to 6 ⁇ 10 5 .
- the organic acid in the catalyst removal solvent is preferably lactic acid or glycolic acid, and particularly preferably lactic acid.
- the catalyst removing solvent only needs to contain the organic acid, and the type of the solvent is not particularly limited.
- the solvent include an organic solvent, an aqueous solvent, or a mixed solvent thereof. Among them, it is preferable to include an organic solvent.
- the solvent containing the organic solvent may be composed of, for example, only an organic solvent, or may further contain an aqueous solvent or the like.
- the volume ratio of the organic solvent in the mixed solvent for example, the organic solvent is 70% or more, preferably 95% or more, and more preferably 100%.
- the type of the organic solvent is not particularly limited, but for example, a solvent in which P (LA / CL) does not dissolve in the catalyst removal step is preferable.
- the organic solvent is not particularly limited, and examples thereof include alcohols such as isopropyl alcohol (IPA), ethanol, methanol, butanol, ethyl acetate, diethyl ether, methyl-t-butyl ether, acetone, methyl ethyl ketone, hexane, heptane, and the like. can give. Any one kind of these organic solvents may be used, or two or more kinds thereof may be used in combination. Examples of the aqueous solvent include water.
- the concentration of the organic acid is not particularly limited, but is preferably, for example, 0.5 to 4 mol / L, more preferably 1 to 4 mol / L, and still more preferably 2 to 4 mol / L. L.
- the concentration of the organic acid in the catalyst removal solvent is set relatively high, the residual catalyst can be efficiently removed in a relatively short time. Further, even when the concentration of the organic acid in the catalyst removal solvent is set relatively low, for example, as described later, by setting the treatment temperature in the catalyst removal step relatively high, Therefore, the residual catalyst can be efficiently removed in a short time.
- the ratio (v / w) of the solvent (volume) to the polymer (weight) is not particularly limited, but is, for example, 2 or more, preferably 5 or more, more preferably 10 or more.
- the polymer is preferably in the form of particles because, for example, purification efficiency can be improved.
- the particle size of the polymer particles is not particularly limited, but is more preferably 1 mm or less.
- the lower limit of the treatment temperature is preferably 35 ° C. or higher, more preferably 40 ° C. or higher.
- the upper limit of the treatment temperature is, for example, 55 ° C. or less, preferably 50 ° C. or less.
- a specific example of the treatment temperature is, for example, 35 to 55 ° C., more preferably 35 to 50 ° C., and further preferably 40 to 50 ° C.
- the present invention for example, by setting the treatment temperature relatively high, the residual catalyst can be removed in a relatively short time. Further, even when the treatment temperature is set to be relatively low, as described above, the content of the organic acid in the catalyst removal solvent is set to be relatively high, so that the remaining in a relatively short time. The catalyst can be removed.
- the treatment time in the catalyst removal step is not particularly limited, and can be appropriately determined according to, for example, the content ratio of the organic acid in the solvent and the treatment temperature.
- a specific example is, for example, 0.5 to 24 hours, preferably 2 to 6 hours.
- the efficiency of catalyst removal can be improved, for example, it is preferable to replace the solvent with a new one as appropriate.
- the content concentration of the organic acid in the catalyst removal solvent is 2.4 mol / L, for example, the ratio of the solvent to the polymer (v / w) is 10 or more, the treatment temperature is 35 to 55 ° C. (for example, 35 to 50). And a treatment time of 1 to 24 hours, preferably a ratio of the solvent to the polymer (v / w) of 10, a treatment temperature of 40 ° C., and a treatment time of 2 to 6 hours.
- the remaining solvent may be removed from the polymer subjected to the catalyst removal treatment.
- the removal method is not particularly limited, and examples thereof include filtration, centrifugation, and drying under reduced pressure. Of these, vacuum drying is preferred because the solvent can be removed sufficiently.
- the amount of residual catalyst in the finally obtained polymer can be appropriately determined according to the application, for example.
- the residual catalyst amount for example, residual tin amount
- the amount of residual catalyst can be sufficiently reduced to these levels.
- the amount of residual catalyst can be reduced.
- the reduction rate of the molecular weight is preferably, for example, 30% or less, more preferably 20% or less, and particularly preferably 10% or less.
- the amount of residual catalyst can be reduced to the aforementioned level while maintaining the molecular weight reduction rate at these levels.
- a monomer removal step of removing monomers remaining in the polymer may be further included.
- a monomer removal step of removing monomers remaining in the polymer may be further included.
- some of the raw material monomers may not be polymerized and remain in the synthetic polymer.
- the molded article of the polymer is used, for example, in a living body or in contact with a living body for medical purposes, it is suggested that there is a possibility of side effects such as inflammation and allergy due to residual monomers. Therefore, in addition to the catalyst removal step as described above, by removing the raw material monomer, it is possible to provide a polymer with better safety.
- the means for removing the monomer is not particularly limited, and examples thereof include a method in which the polymer is further contacted with a solvent containing an organic solvent.
- the monomer removal step can be performed, for example, prior to the catalyst removal step, but is preferably performed on the polymer after the catalyst removal step.
- the contact method is not particularly limited as described above, and can be performed, for example, by immersing the polymer in the solvent. By bringing the solvent into contact with the polymer, for example, the raw material monomer remaining in the polymer can be removed. Therefore, the solvent is hereinafter also referred to as “monomer removal solvent”.
- the monomer removal solvent may be composed of, for example, an organic solvent alone or may further contain an aqueous solvent or the like.
- the organic solvent is 70% or more, preferably 95% or more, and more preferably 100%.
- the solvent for monomer removal does not contain acids, such as the above-mentioned organic acid and an inorganic acid, unlike the said solvent for catalyst removal.
- the organic solvent is not particularly limited, and as described above, various alcohols such as isopropyl alcohol, ethanol, methanol, butanol, hexanol, and octanol, and ethers such as diethyl ether and t-butyl methyl ether are exemplified. . Any one kind of these organic solvents may be used, or two or more kinds thereof may be used in combination. Examples of the aqueous solvent include water.
- the ratio (v / w) of the solvent (volume) to the polymer (weight) is not particularly limited, but is, for example, 2 or more, preferably 5 or more, and more preferably 10 or more.
- the treatment temperature is not particularly limited, but is preferably 25 to 60 ° C., more preferably 40 to 60 ° C., and particularly preferably 60 ° C.
- the residual monomer can be efficiently removed in a relatively short time by setting the treatment temperature in the monomer removal step to be relatively high.
- the treatment time in the monomer removal step is not particularly limited, and can be appropriately determined according to, for example, the treatment temperature. Moreover, since the removal efficiency of a raw material monomer can be improved, it is preferable to replace
- a step of removing an organic acid contained in the catalyst removal solvent from the polymer (hereinafter, also referred to as “organic acid removal step”). You may have.
- the polymer after the catalyst removing step may be brought into contact with a solvent.
- the contact method is not particularly limited as described above.
- the kind in particular of the said solvent is not restrict
- the weight volume ratio to the polymer, the treatment temperature and the like are not particularly limited, and can be performed in the same manner as in the catalyst removal step, for example, except that the solvent does not contain an acid such as an organic acid or an inorganic acid.
- the treatment time is not particularly limited, but is, for example, 0.5 to 2 hours, preferably 1 hour.
- the organic acid removal step is optional, and for example, in the monomer removal step, the organic acid contained in the catalyst removal solvent can be removed.
- the method for producing a polymer of the present invention includes the purification method of the present invention.
- the point is to reduce the residual catalyst by the purification method of the present invention, and the other steps and conditions are not limited at all.
- the amount of residual catalyst in the crude polymer obtained by the polymerization reaction is not limited at all. For this reason, in the polymerization reaction performed prior to purification, the amount of catalyst used is not limited.
- Purification was performed by immersing P (LA / CL) in IPA containing an organic acid, and changes in residual tin amount and molecular weight over time were confirmed.
- the final target tin amount was set to 5 wt. Ppm or less, and the final molecular weight retention rate was set to 80% or more for evaluation. This set value does not limit the present invention.
- Example 1 Regarding the catalyst removal treatment using the catalyst removal solvent containing lactic acid, the relationship between the immersion temperature and the immersion time and the change in the residual tin amount and the molecular weight was confirmed.
- the ratio (v / w) between P (LA / CL) and the solvent is 10.
- the particulate P (LA / CL) after the immersion was dried under reduced pressure at 70 ° C. for 12 hours to remove the solvent in the P (LA / CL).
- the obtained purified P (LA / CL) was subjected to quantitative determination of residual tin and measurement of molecular weight.
- the ratio (residual rate)% when the amount of residual tin of unpurified P (LA / CL) was set to 100% was calculated (hereinafter the same).
- the maintenance factor (100xMw / Mw0%) when the molecular weight (Mw0) of unpurified P (LA / CL) was set to 100% was determined (hereinafter the same).
- Lactic acid concentration and immersion time The raw material molar ratio (A: B) of lactide (A) to caprolactone (B) was 65:35, and tin octylate was used as a catalyst, and P (LA / CL) was Got ready.
- the P (LA / CL) has a catalyst amount of 20 mol. ppm (residual tin amount 19.05 wt. ppm) and molecular weight (Mw) were 379,000.
- the lactic acid concentration is set to a predetermined concentration (1.2 mol / L, 2.4 mol / L, 3.6 mol / L), and the immersion time is the treatment time (2, 6, 12, 24).
- the purification process was performed in the same manner as described above except that the time was set.
- any lactic acid concentration can sufficiently reduce the residual tin while maintaining the molecular weight.
- the higher the lactic acid concentration the higher the removal rate of residual tin (100-residual rate) compared to the Mw reduction rate (100-retention rate). all right.
- the higher the concentration of lactic acid in the catalyst removal solvent it was found that the higher the concentration of lactic acid in the catalyst removal solvent, the more efficiently the residual tin can be removed in a relatively short time. .
- the raw material molar ratio (A: B) of lactide (A) to caprolactone (B) was 68:32, and tin octylate was used as a catalyst to prepare P (LA / CL).
- the P (LA / CL) has a catalyst amount of 100 mol. ppm (residual tin amount 113.2 wt. ppm) and molecular weight (Mw) were 451,000.
- the P (LA / CL) was pulverized and processed into particles having a particle size of about 0.5 mm. 2 g of this particulate P (LA / CL) was put into 20 mL of the catalyst removal solvent and stirred at 40 ° C. for 1 hour.
- IPA containing lactic acid at a predetermined concentration 2.4 mol / L, 3.6 mol / L
- the ratio (v / w) of P (LA / CL) to the catalyst removal solvent is 10.
- the immersion of the polymer in the solvent was performed once to four times in total by exchanging the solvent every hour.
- the particulate P (LA / CL) after the immersion was dried under reduced pressure at 70 ° C. for 12 hours to remove the solvent in the P (LA / CL).
- the obtained purified P (LA / CL) was subjected to quantitative determination of residual tin and measurement of molecular weight.
- the molecular weight is sufficiently maintained by performing the immersion treatment in the catalyst removal solvent containing lactic acid. It was found that the amount of residual tin can be reduced to a sufficiently low value. It was also found that residual tin can be removed more efficiently by exchanging the catalyst removal solvent during immersion.
- the present invention even if the amount of residual tin in P (LA / CL) is very high, the residual tin can be removed efficiently. For example, P (LA / CL before purification) ) The residual tin content is not particularly problematic. For this reason, it is also possible to shorten the polymerization time by increasing the amount of catalyst during the synthesis of P (LA / CL). Therefore, according to the present invention, conditions for the synthesis of P (LA / CL), which is the previous stage, can be relaxed, and more efficient synthesis can be realized.
- Example 3 The raw material molar ratio (A: B) of lactide (A) to caprolactone (B) was 64.7: 35.3, and P (LA / CL) was prepared.
- the P (LA / CL) has a molecular weight (Mw) of 176,000 and a residual tin amount of 87.1 wt. ppm, residual lactide 1.04 wt. %, Residual caprolactone 2.36 wt. %Met.
- the P (LA / CL) was pulverized and processed into particles having a particle size of about 1 mm.
- the obtained polymer had a residual lactide of 0.018 wt. ppm, residual caprolactone 0.0017 wt. ppm, residual tin 6.5 wt. ppm.
- the residual amount of tin, lactide, and caprolactone can be sufficiently reduced while suppressing the decrease in molecular weight by packing P (LA / CL) into the column and circulating various solvents. It was.
- Example 4 Using IPA containing various organic acids, purification treatment of P (LA / CL) was performed, and changes in residual tin amount and molecular weight were confirmed.
- the raw material molar ratio (A: B) of lactide (A) to caprolactone (B) was 60:40, and P (LA / CL) was prepared.
- the P (LA / CL) has a residual tin content of about 20 wt. ppm and molecular weight (Mw) 210,000.
- the P (LA / CL) was pulverized and processed into particles having a particle size of about 1 mm. 3 g of this particulate P (LA / CL) was put into 30 mL of an IPA solvent containing various acids and stirred at 40 ° C. for 24 hours.
- the ratio (v / w) between P (LA / CL) and the solvent is 10.
- the particulate P (LA / CL) after the immersion was dried under reduced pressure at 70 ° C. for 12 hours to remove the solvent in the P (LA / CL).
- the obtained purified P (LA / CL) was subjected to quantitative determination of residual tin and measurement of molecular weight.
- the ratio (residual rate)% when the residual tin amount of unpurified P (LA / CL) was made into 100% was calculated
- the maintenance factor (100xMw / Mw0%) when the molecular weight (Mw0) of unpurified P (LA / CL) was set to 100% was calculated
- the purification method of the present invention it is possible to suppress a decrease in the molecular weight of the polymer and effectively reduce the residual catalyst of the polymer. For this reason, the influence on a human body or the environment can be suppressed, and in particular, the safety of a polymer used in the medical field can be sufficiently improved.
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Abstract
Description
P(LA/CL)を、硫酸と硝酸とによる湿式灰化法で分解した。この分解産物について、ICP発光分光分析装置を用いて残留スズを測定した。このようにして、残量スズの定量を行った(以下、同様)。
P(LA/CL)をクロロホルムに溶解し、GPC(ゲルパーミエーションクロマトグラフィー、移動相:クロロホルム)を用いて、標準ポリスチレン換算により重量平均分子量を測定した(以下、同様)。
乳酸を含む触媒除去用溶媒を用いた触媒除去処理について、浸漬温度および浸漬時間と、残留スズ量および分子量の変化との関係を確認した。
ラクチド(A)とカプロラクトン(B)との原料モル比(A:B)を60:40とし、P(LA/CL)を準備した。前記P(LA/CL)は、残留スズ量約77wt.ppm、分子量(Mw)77,000であった。このP(LA/CL)を粉砕して粒径約1mm程度の粒子に加工した。この粒子状P(LA/CL)3gを、触媒除去用溶媒30mLに投入し、所定温度で1時間攪拌した。前記触媒除去用溶媒として、2.4mol/Lの乳酸を含むIPAを使用した。P(LA/CL)と前記溶媒との比(v/w)は、10である。前記浸漬後の粒子状P(LA/CL)を、70℃で12時間減圧乾燥し、前記P(LA/CL)内の溶媒を除去した。得られた精製P(LA/CL)について、残留スズの定量ならびに分子量の測定を行った。なお、スズについては、未精製P(LA/CL)の残留スズ量を100%とした場合の割合(残留率)%を求めた(以下、同様)。また、分子量については、未精製P(LA/CL)の分子量(Mw0)を100%とした場合の維持率(100×Mw/Mw0 %)を求めた(以下、同様)。これらの結果を、下記表に示す。
ラクチド(A)とカプロラクトン(B)との原料モル比(A:B)を65:35とし、触媒としてオクチル酸スズを使用して、P(LA/CL)を準備した。前記P(LA/CL)は、前記触媒量が20mol.ppm(残留スズ量19.05wt.ppm)、分子量(Mw)が379,000であった。このP(LA/CL)を使用し、乳酸濃度を所定濃度(1.2mol/L、2.4mol/L、3.6mol/L)とし、浸漬時間を処理時間(2、6、12、24時間)とした以外は、前述と同様に精製処理を行った。これらの結果を下記表に示す。
触媒由来の残留スズを大量に含むP(LA/CL)について、触媒除去用溶媒として乳酸含有IPAを用いて残留スズの除去を行った。
ラクチド(A)とカプロラクトン(B)との原料モル比(A:B)を64.7:35.3とし、P(LA/CL)を準備した。前記P(LA/CL)は、分子量(Mw)176,000、残留スズ量87.1wt.ppm、残留ラクチド1.04wt.%、残留カプロラクトン2.36wt.%であった。このP(LA/CL)を粉砕して粒径約1mm程度の粒子に加工した。この粒子状P(LA/CL)12gを、直径2cm×長さ10cmのカラムに充填し、40℃の触媒除去用溶媒を流速10.5ml/分で6分間流し、その後、24分間循環させた。前記触媒除去用溶媒として、2.4mol/L(20%)乳酸含有IPAを使用した。これを6回繰り返した後、モノマー除去用溶媒として40℃の乳酸未含有IPAを流速16ml/分で4分流し、その後、56分間循環させた。これを6回繰り返した。そして、得られたP(LA/CL)を、70℃で12時間減圧乾燥し、前記P(LA/CL)内の溶媒を除去した。得られた精製P(LA/CL)について、残留スズ、残量ラクチドおよび残量カプロラクトンの定量、および、分子量の測定を行った。
各種有機酸を含むIPAを用いて、P(LA/CL)の精製処理を行い、残留スズ量の変化および分子量の変化を確認した。
Claims (20)
- 残留触媒を含むポリマーの精製方法であって、
前記ポリマーを、有機酸含有有機溶媒を含む触媒除去用溶媒に接触させる触媒除去工程を含み、
前記有機酸が、pKa2~3.9の範囲の有機酸であることを特徴とする精製方法。 - 前記有機酸が、α-ヒドロキシモノカルボン酸である、請求の範囲1記載の精製方法。
- 前記α-ヒドロキシモノカルボン酸が、乳酸およびグリコール酸の少なくとも一方である、請求の範囲2記載の精製方法。
- 前記有機酸が、ピルビン酸、クエン酸およびリンゴ酸からなる群から選択された少なくとも一つである、請求の範囲1記載の精製方法。
- 前記触媒除去工程における温度条件が、30~55℃の範囲である、請求の範囲1記載の精製方法。
- 前記触媒除去工程における温度条件が、35~55℃の範囲である、請求の範囲1記載の精製方法。
- 前記ポリマーに対する前記触媒除去用溶媒の比(v/w)が、2以上である、請求の範囲1記載の精製方法。
- 前記触媒除去用溶媒における前記有機酸の含有濃度が、0.5~4mol/Lの範囲である、請求の範囲1記載の精製方法。
- 前記触媒除去工程において、前記ポリマーと前記触媒除去用溶媒との接触時間が、1~24時間の範囲である、請求の範囲1記載の精製方法。
- 前記ポリマーが、粒子状ポリマーである、請求の範囲1記載の精製方法。
- 前記粒子状ポリマーの粒径が、1mm以下である、請求の範囲10記載の精製方法。
- 前記有機溶媒が、イソプロピルアルコール、エタノール、メタノール、ブタノール、ヘキサノール、オクタノール、ジエチルエーテル、t-ブチルメチルエーテル、酢酸エチル、アセトン、メチルエチルケトン、ヘキサンおよびヘプタンからなる群から選択された少なくとも一つである、請求の範囲1記載の精製方法。
- 前記ポリマーが、生分解性ポリマーである、請求の範囲1記載の精製方法。
- 前記ポリマーが、ポリエステルである、請求の範囲1記載の精製方法。
- 前記ポリマーが、乳酸、グリコール酸、トリメチレンカーボネート、ε-カプロラクトン、γ-ブチロラクトン、δ-バレロラクトンおよびパラジオキサノンからなる群から選択された少なくとも一つを原料とするポリマーである、請求の範囲1記載の精製方法。
- 前記ポリマーが、乳酸とカプロラクトンとの共重合体である、請求の範囲15記載の精製方法。
- 前記触媒が、金属または金属化合物である、請求の範囲1記載の精製方法。
- 前記金属が、スズ、チタン、亜鉛、ジルコニウム、アンチモンおよび鉄からなる群から選択された少なくとも一つである、請求の範囲1記載の精製方法。
- 前記ポリマーと前記溶媒との接触が、前記ポリマーの前記溶媒への浸漬である、請求の範囲1記載の精製方法。
- ポリマーの製造方法であって、
ポリマーの精製工程を含み、前記精製工程において、請求の範囲1記載のポリマーの精製方法により精製を行うことを特徴とする製造方法。
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EP09726242A EP2267055A1 (en) | 2008-03-28 | 2009-03-27 | Method for purifying polymer and process for producing polymer using the method |
US12/934,534 US20110021742A1 (en) | 2008-03-28 | 2009-03-27 | Method for purifying polymer and method for producing polymer using the same |
CN2009801047394A CN101939355A (zh) | 2008-03-28 | 2009-03-27 | 聚合物的纯化方法及使用其的聚合物的制造方法 |
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WO2010106722A1 (ja) * | 2009-03-17 | 2010-09-23 | 株式会社クレハ | 低溶融粘度化ポリグリコール酸の製造方法 |
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US8895962B2 (en) | 2010-06-29 | 2014-11-25 | Nanogram Corporation | Silicon/germanium nanoparticle inks, laser pyrolysis reactors for the synthesis of nanoparticles and associated methods |
JP2013224398A (ja) * | 2011-08-12 | 2013-10-31 | Ricoh Co Ltd | ポリマー生成物、成形体、医療用成形体、トナー、及びポリマー組成物 |
JP5333621B2 (ja) * | 2011-08-12 | 2013-11-06 | 株式会社リコー | ポリマー生成物、成形体、医療用成形体、トナー、及びポリマー組成物 |
US20140179049A1 (en) * | 2012-12-20 | 2014-06-26 | Nanogram Corporation | Silicon/germanium-based nanoparticle pastes with ultra low metal contamination |
KR101958056B1 (ko) | 2013-05-24 | 2019-03-13 | 데이진 가부시키가이샤 | 고점도 알콜 용매 및 실리콘/게르마늄계 나노입자를 포함하는 인쇄용 잉크 |
KR102126984B1 (ko) * | 2016-07-25 | 2020-06-26 | 주식회사 삼양바이오팜 | 생분해성 고분자의 정제 방법 |
SG11202001688WA (en) * | 2017-08-31 | 2020-03-30 | Evonik Corp | Improved resorbable polymer purification process |
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- 2009-03-27 EP EP09726242A patent/EP2267055A1/en not_active Withdrawn
- 2009-03-27 KR KR1020107017023A patent/KR20100108577A/ko not_active Application Discontinuation
- 2009-03-27 WO PCT/JP2009/056347 patent/WO2009119825A1/ja active Application Filing
- 2009-03-27 CN CN2009801047394A patent/CN101939355A/zh active Pending
- 2009-03-27 JP JP2009079539A patent/JP2009256668A/ja not_active Withdrawn
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JP3184680B2 (ja) | 1992-10-09 | 2001-07-09 | 三井化学株式会社 | ポリヒドロキシカルボン酸の精製方法 |
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EP2267055A1 (en) | 2010-12-29 |
JP2009256668A (ja) | 2009-11-05 |
KR20100108577A (ko) | 2010-10-07 |
CN101939355A (zh) | 2011-01-05 |
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