WO2004033528A1 - 高分子量脂肪族ポリエステル及びその製造方法 - Google Patents
高分子量脂肪族ポリエステル及びその製造方法 Download PDFInfo
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- WO2004033528A1 WO2004033528A1 PCT/JP2003/012882 JP0312882W WO2004033528A1 WO 2004033528 A1 WO2004033528 A1 WO 2004033528A1 JP 0312882 W JP0312882 W JP 0312882W WO 2004033528 A1 WO2004033528 A1 WO 2004033528A1
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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
- C08G63/91—Polymers modified by chemical after-treatment
- C08G63/912—Polymers modified by chemical after-treatment derived from hydroxycarboxylic acids
Definitions
- the present invention relates to a high molecular weight aliphatic polyester obtained by converting a ring-opening (co) polymer of at least one cyclic ester selected from the group consisting of glycolide and lactide into a high molecular weight by reaction with a chain extender, and a method for producing the same.
- the high molecular weight aliphatic polyester of the present invention has a high molecular weight and excellent heat resistance, and can be used for extruded products such as sheets, films and fibers, compression molded products, injection molded products, blow molded products, composite materials (multilayer films, It can be used in a wide range of fields as multi-layer containers and other molded articles.
- Aliphatic polyesters such as polyglycolic acid and polylactic acid
- these aliphatic polyesters have biodegradability and absorbability and biocompatibility, they are useful as medical polymer materials such as surgical sutures and artificial skin (for example, U.S. Pat. No. 3,297,033).
- polydalicholic acid has remarkably excellent gas barrier properties, and is being developed for new uses as sheets, films, containers and the like (see, for example, Japanese Patent Application Laid-Open No. H10-016136).
- Publication Japanese Patent Application Laid-Open No. 10-89090, Japanese Patent Application Laid-Open No. 10-37837, Japanese Patent Application Publication No. 10-337772).
- Polyglycolic acid can be produced by dehydration polycondensation of glycolic acid, dealcoholization polycondensation of alkyl glycolate, desalting polycondensation of glycolate, and the like. It is difficult to obtain polyglycolic acid.
- bimolecular cyclic esters of glycolic acid (“Ring )
- Ring-opened polymers of glycolide are sometimes referred to as polyglycolides.
- polylactic acid is usually synthesized by ring-opening polymerization of lactide (L-lactide and Z or D-lactide), which is a bimolecular cyclic ester of lactic acid.
- lactide L-lactide and Z or D-lactide
- the ring-opened polymer of lactide is sometimes called polylactide. Ring-opening copolymerization of glycolide and lactide can also be carried out.
- Ring-opening (co) polymerization of cyclic ester of glycolide-lactide can produce relatively high-molecular-weight aliphatic polyesters compared to polycondensation of glycolic acid and lactic acid. At first glance, it is not enough, and there are still issues to be solved in increasing the molecular weight.
- high-purity monomers must be used to synthesize high-molecular-weight aliphatic polyesters by ring-opening (co) polymerization of cyclic esters.
- glycolide perlactide in addition to its high production cost, is difficult to purify to a high degree, and the purification process requires additional costs. Therefore, it has been extremely difficult to industrially supply high-molecular-weight aliphatic polyesters in large quantities at low cost in a production method that requires the use of high-purity monomers.
- the molecular weight of aliphatic polyesters tends to fluctuate greatly due to slight changes in polymerization conditions such as polymerization temperature, polymerization time, polymerization pressure, and types and amounts of catalysts and additives, in addition to monomer purity. . Therefore, it has been difficult to stably produce a high molecular weight aliphatic polyester.
- the level of the molecular weight is not necessarily sufficient.
- the weight average molecular weight (Mw) of polydalicholic acid obtained by ring-opening polymerization of glycolide is about 100,000. In order to produce molded articles having high physical properties, it is necessary to further increase the molecular weight of the aliphatic polyester.
- Another object of the present invention is to improve the heat resistance and moldability by easily increasing the molecular weight to a desired molecular weight without necessarily using high-purity glycolide lactide as a starting material. It is another object of the present invention to provide a method for producing a high molecular weight aliphatic polyester.
- the present inventors have conducted intensive studies to achieve the above object, and as a result, have conducted a chain extension reaction of a ring-opening (co) polymer of at least one cyclic ester selected from the group consisting of glycolide and lactide with an oxazoline compound.
- a chain extension reaction of a ring-opening (co) polymer of at least one cyclic ester selected from the group consisting of glycolide and lactide with an oxazoline compound.
- a high-molecular-weight aliphatic polyester can be produced even when an oxazoline compound is used alone as a chain extender.
- the high molecular weight aliphatic polyester obtained by the production method of the present invention has a high thermogravimetric reduction start temperature, and has remarkably improved heat resistance. Since the high molecular weight aliphatic polyester of the present invention has a moderately broad molecular weight distribution, the moldability is improved.
- the oxazoline compound functions as a chain extender, and does not serve merely as a terminal blocking agent. The present invention has been completed based on these findings.
- the ring opening (co) of at least one kind of cyclic ester selected from the group consisting of glycolide and lactide is carried out by a chain extension reaction with an oxazoline compound, whereby the ring opening (co) )
- the weight-average molecular weight of the polymer (the ratio of the weight-average molecular weight (Mw 2 ) of the ring-opened (co) polymer after chain extension to Mw J (the molecular weight increase represented by A high molecular weight aliphatic polyester having a high molecular weight is provided.
- a ring-opening (co) polymer of at least one cyclic ester selected from the group consisting of glycolide and lactide is subjected to a chain extension reaction with an oxazoline compound, and the ring opening before the chain extension ( co) the weight average molecular weight of the polymer (M W l) for Kusarinobe Chogo ring-opening (co) weight average molecular weight of the polymer (Mw 2) a ratio (Mw 2 ZM W l) a molecular weight increasing rate being the table
- a method for producing a high-molecular-weight aliphatic polyester which has a high-molecular weight until it reaches 1.1 or more.
- Ring-opening (co) polymer of cyclic ester is glycolide, lactide, or Dalicoll Can be obtained by ring-opening (co) polymerizing a mixture of lactide and lactide.
- Dalicollide is a bimolecular cyclic ester of glycolic acid, and can be preferably produced by, for example, depolymerization of glycolic acid oligomer.
- Lactide is a bimolecular cyclic ester of lactic acid, and may be any of L-form, D-form, racemate, and a mixture thereof.
- glycolide is suitable as a starting material because it is difficult to obtain high-purity glycolide in large quantities at low cost.
- high-molecular-weight polydalicholate polyglycolide
- glycolide is used when high molecular weight aliphatic polyesters are used in applications such as sheets, films, containers, and composite materials that require high gas barrier properties. It is desirable to use a monomer as a main component.
- the proportion of glycolide is preferably 55% by weight or more, more preferably 70% by weight or more, and particularly preferably 90% by weight or more.
- glycolide can be used alone.
- glycolide, lactide, or a mixture thereof is used as a monomer, and as other comonomers, ratatatones (for example,) 3-proviolatatone, J3-butyrolactone, pivalolactone, / _butyrolataton, ⁇ -valetone Cyclic monomers such as ratatone, ⁇ -methyi / ray ⁇ -valerolatatatone, ⁇ -force prolactone, etc.), trimethylene carbonate, and 1,3-dioxane can be used in combination.
- comonomers are usually used in a proportion of 45% by weight or less, preferably 30% by weight or less, more preferably 10% by weight or less.
- the ring-opening (co) polymerization of the cyclic ester is preferably carried out in the presence of a small amount of a catalyst.
- a catalyst include, but are not limited to, tin halides (eg, tin dichloride, tin tetrachloride, etc.), and organic tin carboxylate (eg, tin octanoate such as tin 2-ethylhexanoate).
- the amount of the catalyst to be used is preferably about 1 to 100 ppm, more preferably about 3 to 300 ppm, by weight, relative to the cyclic ester.
- the ring-opening (co) polymerization of the cyclic ester may be a bulk polymerization or a solution polymerization, which is optional. In many cases, the bulk polymerization is employed. For controlling the molecular weight, higher alcohols such as lauryl alcohol and water can be used as molecular weight regulators. Further, a polyhydric alcohol such as glycerin may be added for improving the physical properties.
- polymerization equipment for bulk polymerization, such as an extruder type, a vertical type with paddle blades, a vertical type with helical ribbon blades, an extruder type or kneader horizontal type, ampule type, plate type, and tubular type. It can be appropriately selected from the devices.
- Various reaction vessels can be used for solution polymerization.
- the polymerization temperature can be appropriately set according to the purpose within a range from 120 ° C. to 300 ° C. which is a substantial polymerization initiation temperature.
- the polymerization temperature is preferably from 130 to 250 ° C (:, more preferably from 140 to 230 ° C, and particularly preferably from 150 to 225 ° C. If the polymerization time is too long, the formed polymer is susceptible to thermal decomposition, and the polymerization time is in the range of 3 minutes to 20 hours, preferably 5 minutes to 18 hours. If it does not proceed sufficiently, and if it is too long, the produced polymer tends to be colored.
- the molecular weight of the ring-opening (co) polymer of the cyclic ester is not particularly limited. Even a relatively low molecular weight ring-opening (co) polymer can be made high molecular weight by a chain extension reaction with an oxazoline compound. By reaction with oxazoline compounds, In order to efficiently obtain a high-molecular-weight aliphatic polyester by high-molecular-weight polymerization, the weight-average molecular weight (Mw) of the ring-opened (co) polymer should be 30,000 or more, preferably 30,000 to It is about 500,000, more preferably about 30,000 to 110,000.
- the oxazoline compound used in the present invention includes, for example, 2-oxazoline, 2-methynole-12-oxazoline, 2-isopropyl-12-oxazoline, 2-butynole 2-oxazoline, 2-phenyl-2-oxazoline and the like.
- 2,2-oxazoline compounds 2,2'-bis- (2-oxazoline), 2,2'-methylene-bis- (2-oxazoline), 2,2'-ethylene-bis- (2-oxazoline), 2, 2'-trimethylene-bis- (2-oxazoline), 2,2'-tetramethylene-bis- (2-oxazoline), 2,2'-1- ⁇ -xamethylene-bis- (2-oxazoline), 2,2'-otatamethylene 1,1-bis (2-oxazoline), 2,2'-ethylene-bis- (4, A'-dimethyl-2-oxazoline), 2,2'_p-phenylene-bis- (2-oxazoline), 2, 2 '—m— Conversion of 2,2'-bis- (2-oxazoline) such as phenylene-bis- (2-oxazoline) and 2,2'-m-phenylene-bis-bis (4,4'-dimethyl-2-oxazoline) Compound: bis- (2-oxazolinylcyclohex
- oxazoline compound a compound having at least two oxazoline ring structures in the molecule is preferable for efficient chain extension reaction.
- oxazoline compounds the following formula (1) Compounds having two oxazoline ring structures in the molecule represented by are more preferred.
- A is a single bond or a divalent organic group.
- divalent organic group As a divalent organic group,
- n is an integer of 1 or more, preferably 1 to 20
- a phenylene group are preferred.
- ! ⁇ ! ⁇ Is independently an alkyl group (1 to 10 carbon atoms), a cycloalkyl group, a phenyl group, or the like, and is preferably an alkyl group having 1 to 5 carbon atoms.
- 2,2'-m-phenylene-bis- (2-oxazoline) represented by is particularly preferred because it is easily available and has excellent reactivity.
- the amount of the oxazoline compound used is preferably 0.001 to 10 parts by weight, more preferably 0.05 to 7 parts by weight, and particularly preferably 100 to 100 parts by weight of the ring-opening (co) polymer of the cyclic ester. Is 0.1 to 5 parts by weight. If the amount of the oxazoline compound is too small, it becomes difficult to sufficiently reduce the molecular weight of the ring-opened (co) polymer, and if it is too large, the chain elongation effect tends to be saturated and is not economical. By adjusting the amount of the oxazoline compound used, a high molecular weight aliphatic polyester having a desired molecular weight can be obtained.
- the oxazoline compound can be added to the reaction system during or after the ring-opening (co) polymerization of the cyclic ester.
- the oxazoline compound may be added all at once, or may be added in two or more portions.
- the reaction temperature between the ring-opening (co) polymer and the oxazoline compound is preferably in the range of 100 to 300 ° C, more preferably in the range of 150 to 280 ° C.
- the reaction temperature is It is particularly preferable that the temperature is not less than the melting temperature of the ring-opening (co) polymer and not more than 300 ° C, more preferably not less than the melting temperature and not more than 280 ° C.
- the reaction time depends on the reaction temperature, but is preferably
- the present inventors think as follows. It is known that oxazoline compounds such as 2-oxazoline exhibit living polymerization behavior by opening the ring if conditions are selected.
- the ring-opening (co) polymer of glycolide-lactide has a carboxyl group at least at one end. Due to the interaction between the carboxyl group and the oxazoline ring, the bond between the carbon atom at the 5-position of the oxazoline ring and the oxygen atom (0-C) is broken, the oxazoline ring is opened, and the oxygen atom of the carboxyl group is opened.
- One COO is attached to the 5-position carbon atom of the oxazoline ring. It can be considered that the oxazoline compound acts as a chain extender by a reaction mechanism including such a reaction.
- the chain extension reaction using the oxazoline conjugate is more efficiently performed by using a compound having two or more oxazoline rings in the molecule.
- the reaction with such an oxazoline compound is a chain extension reaction in which a significant increase in the molecular weight of the ring-opened (co) polymer is observed, unlike the simple end blocking reaction with an oxazoline compound. 4. High molecular weight aliphatic polyester
- the molecular weight of the high molecular weight aliphatic polyester varies depending on the molecular weight of the ring-opening (co) polymer used, the amount of the oxazoline compound added, the reaction conditions, and the like, and is not particularly limited.
- the weight average molecular weight (Mw) is preferably not less than 120,000, more preferably not less than 130,000, particularly preferably not less than 150,000.
- a high molecular weight aliphatic polyester can be obtained.
- weight average molecular weight (Mw) There is no upper limit, but it is usually 1,000,000, and in many cases about 500,000.
- Ring-opening polymerization of glycolide often results in ring-opened polymers having a weight average molecular weight (Mw) of up to about 100,000 or about 110,000.
- Mw weight average molecular weight
- an oxazoline-conjugated product for example, a high-molecular-weight aliphatic polyester having a high molecular weight of about 150,000 to 250,000 in a weight average molecular weight (Mw) is obtained.
- Mw weight average molecular weight
- the molecular weight can be further increased by adjusting the reaction conditions of the chain extension reaction such as the amount of the oxazoline compound used.
- the rate of increase in molecular weight due to the chain extension reaction between the ring-opening (co) polymer and the oxazoline compound is determined by the weight-average molecular weight of the ring-opening (co) polymer before chain extension (the ring-opening (co) polymer after chain extension relative to MwJ) (Ie, high molecular weight aliphatic polyester) weight average molecular weight
- the molecular weight increase rate can be represented by the ratio (Mws / MWJ of (Mw 2), the molecular weight increase rate of preferably 1.10 or more, more preferably 1.20 or more, particularly good Mashiku 1.
- the molecular weight of the ring-opened (co) polymer can be increased up to 35 or more.
- the molecular weight increase rate (MwsZMwJ has no particular upper limit, but is usually 10.00, preferably 5.00, more preferably 3 50.
- a high molecular weight aliphatic polyester having a relatively broad molecular weight distribution as compared with the ring-opened (co) polymer before chain extension can be obtained.
- Molecular weight expressed by the ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) of a ring-opened (co) polymer (ie, high molecular weight aliphatic polyester) that has been made high molecular weight by a chain extension reaction.
- the distribution (Mw / Mn) is preferably 1.90 or more, more preferably 2.00 or more, and particularly preferably 2.10 or more. There is no upper limit for this molecular weight distribution (Mw / Mn), but it is usually 5.50, and in many cases about 4.50. If the molecular weight distribution is too large, the integral properties of the polymer may be impaired.
- the high molecular weight aliphatic polyester obtained by the method of the present invention is The heat resistance is remarkably improved compared to the ring-opened (co) polymer before reacting with the compound.
- the onset temperature of 1% thermogravimetric loss of the polymer can be used.
- the 1% thermal weight loss onset temperature of the ring-opening (co) polymer before chain extension is 1 ⁇
- the high molecular weight aliphatic polyester obtained by the chain extension reaction of the ring-opening (co) polymer and the oxazoline compound is when 1% -weight loss starting temperature was T 2, ⁇ 2 - 1 properly like the ⁇ is 3 ° C or more, and more preferably be at least 5 ° C.
- the T 2 — 1 ⁇ is more than 15 ° C, It can be up to 0 ° C or more.
- the effect of improving heat resistance showed some saturation tendency with increasing weight average molecular weight that by the chain extension reaction (Mw), Ding 2 - 1 upper limit of ⁇ usually 3 0 ° C, in many cases 2 About 5 ° C.
- the high molecular weight aliphatic polyester of the present invention may contain, if desired, additives such as inorganic fillers, lubricants, plasticizers, coloring agents (dyes and pigments), heat stabilizers, and conductive fillers; and other thermoplastic resins. Can be contained. These additive components can be added before, during, or after the addition of the oxazoline compound as long as they do not inhibit the chain extension reaction between the ring-opening (co) polymer and the oxazoline compound. Further, these additive components can be added to the resulting high molecular weight aliphatic polyester after the chain extension reaction between the ring-opening (co) polymer and the oxazoline compound.
- additives such as inorganic fillers, lubricants, plasticizers, coloring agents (dyes and pigments), heat stabilizers, and conductive fillers; and other thermoplastic resins. Can be contained. These additive components can be added before, during, or after the addition of the oxazoline compound as long as they do not
- the weight average molecular weight (Mw) and the molecular weight distribution (Mw / Mn) were measured using a gel permeation chromatography (GPC) analyzer under the following conditions. Hexafluoroisopropanol (used after distilling the product of Central Glass Co., Ltd.) is added with sodium trifluoroacetate (Kanto Chemical) and dissolved. Make 5 mM trifluoroacetic acid sodium salt solvent (A).
- the solvent (A) is passed through a column (HF IP—LG + HF IP — 806MX2: SHODEX) at a flow rate of 40 ° (lm 1 min.), And the molecular weight is 82.7,000, 101,000, and 34,000. , 100,000 and 0.20, 5 mg of each of polymethyl methacrylate (POLYMER LABORATOR IES Ltd.) of known molecular weight (10 mg) and the solvent (A) as a 10 ml solution. Pass 100 ⁇ l of the solution through the column to determine the peak time of detection by refraction index (RI) detection. Next, 10 mg of the sample was added with the solvent (A), and the mixture was made into a 10-ml vigorous night. 100 ⁇ l of the mixture was passed through the column.
- the molecular weight distribution (Mw / Mn) was calculated using the C-R4 AGPC program Ver1.2 manufactured by Shimadzu Corporation.
- Nitrogen is flowed at a flow rate of 1 Oml / min using a TG 50 made of a melane earth thermogravimetric analyzer, and the aliphatic polyester is heated under a nitrogen atmosphere at a heating rate of 50 ° C to 2 ° C / min to reduce the weight. The rate was measured. Weight of the aliphatic polyester at 50 ° C (W 5.) In hand, read accurately the temperature at which the weight has decreased 1%, the temperature of 1% 'Netsukasane loss initiation temperature.
- the ring-opened (co) polymer and the oxazoline compound were melt-kneaded using Labo Plastmill manufactured by Toyo Seiki Seisaku-sho, and the maximum torque at that time was measured.
- Glycolic acid oligomer 1.2 kg is charged into a 10-liter flask, and benzyl butyl phthalate (5 kg, manufactured by Junsei Chemical Co., Ltd.) as a solvent and polypropylene glycol (Junsei Chemical Co., Ltd., # 400) as a solubilizing agent.
- Co-distilled with zirbutyl phthalate Co-distilled with zirbutyl phthalate.
- the glycolide lOOg obtained in Synthesis Example 1 and 5 mg of tin tetrachloride were charged into a glass test tube, and polymerized at 200 ° C for 3 hours. After polymerization, extension polymerization was performed at 160 ° C for 12 hours. After the polymerization, the polymer was taken out after cooling, pulverized, and washed with acetone. Thereafter, vacuum drying was performed at 30 ° C. to obtain a polymer. By repeating the above operation, the required amount of polyglycolic acid (polyglycolide) was produced.
- Example 1 The same operation as in Example 1 was carried out except that the amount of added 0.28 g of 2,2′-1 m-phenylene-bis-bis (2-oxazoline) was changed to 0.20 g. Table 1 shows the results. Shown in
- Example 1 The same operation as in Example 1 was carried out, except that the addition amount of 2,2'-1 m-phenylene-bis- (2-oxazoline) was changed from 0.28 g to 1.20 g. The results are shown in Table 1.
- a ring-opening (co) polymer of a cyclic ester such as glycolide lactide which has a high molecular weight by a chain extension reaction and has improved heat resistance and moldability.
- a polyester is provided.
- a method for producing a high-molecular-weight aliphatic polyester that can be easily converted to a desired molecular weight and has improved heat resistance and moldability has been developed. Provided.
- the high molecular weight aliphatic polyester of the present invention has a high molecular weight and excellent heat resistance, and has a moderately broad molecular weight distribution, so that extruded products such as sheets, films and fibers, and compression molded products It can be used in a wide range of fields such as injection molding, blow molding, composite material (multi-layer film, multi-layer container) and other moldings.
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Abstract
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US10/529,449 US20060047088A1 (en) | 2002-10-08 | 2003-10-08 | High-molecular aliphatic polyester and process for producing the same |
AU2003271127A AU2003271127A1 (en) | 2002-10-08 | 2003-10-08 | High-molecular aliphatic polyester and process for producing the same |
JP2004542843A JP4476808B2 (ja) | 2002-10-08 | 2003-10-08 | 高分子量脂肪族ポリエステル及びその製造方法 |
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JP2002-295276 | 2002-10-08 | ||
JP2002295276 | 2002-10-08 |
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WO2004033528A1 true WO2004033528A1 (ja) | 2004-04-22 |
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US (1) | US20060047088A1 (ja) |
JP (1) | JP4476808B2 (ja) |
AU (1) | AU2003271127A1 (ja) |
WO (1) | WO2004033528A1 (ja) |
Cited By (2)
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EP2944663A2 (en) | 2014-05-13 | 2015-11-18 | Ricoh Company, Ltd. | Aliphatic polyester, method of preparing the same, and polymer organizer |
WO2023223701A1 (ja) * | 2022-05-16 | 2023-11-23 | 住友化学株式会社 | 組成物 |
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US7902303B2 (en) * | 2005-12-30 | 2011-03-08 | Industrial Technology Research Institute | Aliphatic polyester polymer compositions and preparation method thereof |
DE602007014354D1 (de) * | 2007-06-23 | 2011-06-16 | Ind Tech Res Inst | Aliphatische Polyester-Polymer-Zusammensetzungen und Herstellungsverfahren dafür |
US8899317B2 (en) | 2008-12-23 | 2014-12-02 | W. Lynn Frazier | Decomposable pumpdown ball for downhole plugs |
US8079413B2 (en) | 2008-12-23 | 2011-12-20 | W. Lynn Frazier | Bottom set downhole plug |
US9062522B2 (en) | 2009-04-21 | 2015-06-23 | W. Lynn Frazier | Configurable inserts for downhole plugs |
US9127527B2 (en) | 2009-04-21 | 2015-09-08 | W. Lynn Frazier | Decomposable impediments for downhole tools and methods for using same |
US9109428B2 (en) | 2009-04-21 | 2015-08-18 | W. Lynn Frazier | Configurable bridge plugs and methods for using same |
US9163477B2 (en) | 2009-04-21 | 2015-10-20 | W. Lynn Frazier | Configurable downhole tools and methods for using same |
US9181772B2 (en) | 2009-04-21 | 2015-11-10 | W. Lynn Frazier | Decomposable impediments for downhole plugs |
US9562415B2 (en) | 2009-04-21 | 2017-02-07 | Magnum Oil Tools International, Ltd. | Configurable inserts for downhole plugs |
US8614190B2 (en) | 2010-06-30 | 2013-12-24 | Industrial Technology Research Institute | Thermal responsive composition for treating bone diseases |
AU2018448134A1 (en) * | 2018-10-29 | 2021-05-27 | Pujing Chemical Industry Co., Ltd | Polyglycolide copolymer and preparation thereof |
US11155677B2 (en) | 2019-12-27 | 2021-10-26 | Dak Americas Llc | Process for making poly(glycolic acid) for containers and films with reduced gas permeability |
US11548979B2 (en) | 2019-12-27 | 2023-01-10 | Dak Americas Llc | Poly(glycolic acid) for containers and films with reduced gas permeability |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000007815A (ja) * | 1998-06-19 | 2000-01-11 | Mitsui Chemicals Inc | 発泡体製造用組成物、発泡体の製造方法、及び、発泡体 |
JP2003128898A (ja) * | 2001-10-23 | 2003-05-08 | Nippon Shokubai Co Ltd | ポリエステル樹脂組成物 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3297033A (en) * | 1963-10-31 | 1967-01-10 | American Cyanamid Co | Surgical sutures |
US5247013A (en) * | 1989-01-27 | 1993-09-21 | Mitsui Toatsu Chemicals, Inc. | Biocompatible polyester and production thereof |
US5470944A (en) * | 1992-02-13 | 1995-11-28 | Arch Development Corporation | Production of high molecular weight polylactic acid |
US6153231A (en) * | 1997-06-25 | 2000-11-28 | Wm. Wrigley Jr. Company | Environmentally friendly chewing gum bases |
-
2003
- 2003-10-08 WO PCT/JP2003/012882 patent/WO2004033528A1/ja active Application Filing
- 2003-10-08 JP JP2004542843A patent/JP4476808B2/ja not_active Expired - Fee Related
- 2003-10-08 AU AU2003271127A patent/AU2003271127A1/en not_active Abandoned
- 2003-10-08 US US10/529,449 patent/US20060047088A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000007815A (ja) * | 1998-06-19 | 2000-01-11 | Mitsui Chemicals Inc | 発泡体製造用組成物、発泡体の製造方法、及び、発泡体 |
JP2003128898A (ja) * | 2001-10-23 | 2003-05-08 | Nippon Shokubai Co Ltd | ポリエステル樹脂組成物 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2944663A2 (en) | 2014-05-13 | 2015-11-18 | Ricoh Company, Ltd. | Aliphatic polyester, method of preparing the same, and polymer organizer |
WO2023223701A1 (ja) * | 2022-05-16 | 2023-11-23 | 住友化学株式会社 | 組成物 |
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AU2003271127A1 (en) | 2004-05-04 |
JP4476808B2 (ja) | 2010-06-09 |
JPWO2004033528A1 (ja) | 2006-02-09 |
US20060047088A1 (en) | 2006-03-02 |
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