WO2025009798A1 - 용융성 및 반응성이 향상된 폴리락트산 수지 및 이의 제조 방법 - Google Patents
용융성 및 반응성이 향상된 폴리락트산 수지 및 이의 제조 방법 Download PDFInfo
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- WO2025009798A1 WO2025009798A1 PCT/KR2024/008850 KR2024008850W WO2025009798A1 WO 2025009798 A1 WO2025009798 A1 WO 2025009798A1 KR 2024008850 W KR2024008850 W KR 2024008850W WO 2025009798 A1 WO2025009798 A1 WO 2025009798A1
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- polylactic acid
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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
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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
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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
- C08G2230/00—Compositions for preparing biodegradable polymers
Definitions
- the present invention relates to a polylactic acid resin having improved melting properties and reactivity and a method for producing the same.
- Polylactic acid is a plant-derived resin obtained from plants such as corn, and is gaining attention as an excellent eco-friendly material due to its biodegradable properties. Unlike existing petroleum-based resins such as polystyrene resin, polyvinyl chloride resin, and polyethylene, polylactic acid has the effect of preventing depletion of petroleum resources and suppressing carbon dioxide emissions, so it can reduce environmental pollution, which is a disadvantage of petroleum-based plastic products.
- Polylactic acid has a wide range of melt index (MI) required depending on the product to be manufactured. Among them, there are cases where polylactic acid with a high melt index is required, and for example, polylactic acid with high flowability (Melt index 500 to 3000 g/10 min @230°C) is required for manufacturing melt-blown nonwoven fabric. However, since the melt index (measured according to ASTM D1238 (230°C, 2.16 kg conditions)) of polylactic acid generally manufactured in a commercialized process is in the range of 5 to 200 g/10 min, it is not easy to polymerize high-flow polylactic acid as described above using conventional methods.
- MI melt index
- polylactic acid having high flowability can be manufactured by treating the manufactured polylactic acid with distilled water as described below to increase the melting index and improve the flowability, thereby completing the present invention.
- the present invention provides a polylactic acid resin having improved melting properties and reactivity and a method for producing the same.
- the present invention provides the following polylactic acid resin:
- the melting index (measured according to ASTM D1238 (230°C, 2.16 kg conditions)) is 300 to 3000 g/10 min,
- the acidity is 20 to 100 mmol Acid/kg
- the inorganic impurity content is less than 100 mg/kg
- the polylactic acid resin according to the present invention is characterized by increasing the melting index and improving the flowability at the same time by the manufacturing method described below, and further, since no other chemical substances or catalysts are used in the manufacturing method, it is characterized by containing almost no inorganic impurities.
- the weight average molecular weight of the polylactic acid resin is 50,000 to 100,000.
- the melting index is 400 g/10 min or more, 500 g/10 min or more, 600 g/10 min or more, 700 g/10 min or more, 800 g/10 min or more, 900 g/10 min or more, or 1000 g/10 min or more; 2900 g/10 min or less, 2800 g/10 min or less, 2700 g/10 min or less, 2600 g/10 min or less, 2500 g/10 min or less, 2400 g/10 min or less, 2300 g/10 min or less, 2200 g/10 min or less, 2100 g/10 min or less, or 2000 g/10 min or less.
- the acid value is 30 mmol Acid/kg or more; 90 mmol Acid/kg or less, 80 mmol Acid/kg or less, 70 mmol Acid/kg or less, or 60 mmol Acid/kg or less.
- the inorganic impurities are Sn and P, and the total content of Sn and P is 85 mg/kg or less.
- the inorganic impurities are Na, Zn, Ti, Al, Ag, Mg, Mn, Ba, Ca, Co, Cr, Cu, Fe, Ga, K, Li, Ni, Sb, Sr, V, and Zr, and the total content of Na, Zn, Ti, Al, Ag, Mg, Mn, Ba, Ca, Co, Cr, Cu, Fe, Ga, K, Li, Ni, Sb, Sr, V, and Zr is 10 mg/kg or less.
- the present invention provides a method for producing the above-described polylactic acid resin comprising the following steps:
- Step 1 Step of immersing polylactic acid resin in water (step 1);
- Step 2 of maintaining the temperature of the water in step 1 above at 65 to 99°C;
- Step 3 Recovering polylactic acid resin from water.
- the present invention is characterized by increasing the melting index of polylactic acid and improving the flowability at the same time by a simple method of treating water with polylactic acid, which is generally manufactured in a commercialized process.
- the present invention will be described in detail step by step.
- Step 1 of the present invention is a step of immersing a polylactic acid resin in water, which is a step of preparing hydrolysis of polylactic acid.
- the polylactic acid resin used in the above step 1 is generally manufactured by a commercialized process, and preferably, the melting index of the polylactic acid (measured according to ASTM D1238 (230°C, 2.16 kg conditions)) is 5 to 200 g/10 min.
- the melting index of the polylactic acid is 5 to 200 g/10 min.
- a general low-flow polylactic acid resin is hydrolyzed as described below to manufacture a high-flow polylactic acid resin.
- the weight average molecular weight of the polylactic acid resin used in the step 1 is 100,000 to 250,000. More preferably, the weight average molecular weight of the polylactic acid resin is 110,000 or more; 240,000 or less, 230,000 or less, 220,000 or less, 210,000 or less, 200,000 or less, 190,000 or less, 180,000 or less, 170,000 or less, 160,000 or less, or 150,000 or less.
- the melting index (measured according to ASTM D1238 (230° C., 2.16 kg conditions)) of the polylactic acid resin of step 1 is 10 g/10 min or more, 20 g/10 min or more, 30 g/10 min or more, 40 g/10 min or more, 50 g/10 min or more, 60 g/10 min or more, 70 g/10 min or more, 80 g/10 min or more, 90 g/10 min or more, or 100 g/10 min or more; 190 g/10 min or less, 180 g/10 min or less, 170 g/10 min or less, 160 g/10 min or less, 150 g/10 min or less, or 140 g/10 min or less.
- the water is distilled water.
- the weight ratio of the polylactic acid resin and water in the step 1 is 1:0.1 to 1:10. More preferably, the weight ratio of the polylactic acid resin and water in the step 1 is 1:0.2 or more, 1:0.3 or more, or 1:0.4 or more; and 1:9 or less, 1:8 or less, 1:7 or less, 1:6 or less, 1:5 or less, 1:4 or less, 1:3 or less, 1:2 or less, or 1:1 or less.
- the polylactic acid resin is added to water, it is preferable to use it in the form of pellets.
- the pellets are not particularly limited as long as they have a shape widely used in the technical field to which the present invention belongs.
- Step 2 of the present invention is a step of maintaining the temperature of the water of step 1 at 65 to 99°C, and is a step of hydrolyzing polylactic acid resin.
- the above meaning of 'hydrolyzing polylactic acid resin' means hydrolyzing a portion of polylactic acid resin, and in particular, hydrolyzing a portion of low-flow polylactic acid resin. Accordingly, the overall flowability of the polylactic acid resin is improved.
- the temperature of the water in step 1 is maintained at 66°C or higher, 67°C or higher, 68°C or higher, 69°C or higher, or 70°C or higher; and 98°C or lower, 98°C or lower, 97°C or lower, 96°C or lower, 95°C or lower, 94°C or lower, 93°C or lower, 92°C or lower, or 91°C or lower.
- step 2 is performed under atmospheric pressure.
- the atmospheric pressure means 1 atm ⁇ 0.1 atm.
- the step 2 is performed for 0.5 to 24 hours. If the performing time is less than 0.5 hours, the hydrolysis is too little and the improvement in flowability is minimal. On the contrary, if the performing time is more than 24 hours, there is a problem that the hydrolysis is too much and the flowability becomes too high. More preferably, the step 2 is performed for 1 hour or more; and 22 hours or less, 20 hours or less, 18 hours or less, 16 hours or less, 14 hours or less, 12 hours or less, or 10 hours or less.
- Step 3 of the present invention is a step of recovering polylactic acid resin from water after the treatment in step 2.
- the polylactic acid resin Since the polylactic acid resin has been in contact with high-temperature water for a long time, it is desirable to cool it at a rapid rate. Accordingly, it is desirable to cool the polylactic acid resin recovered in the above step 3 to 10°C to 20°C. To this end, it is desirable to contact it with cold water of 10°C or lower.
- the polylactic acid resin for subsequent processing of the polylactic acid resin, it is desirable to sufficiently remove even a small amount of water, and for this purpose, drying under reduced pressure is desirable. Preferably, it is desirable to dry so that the moisture content of the polylactic acid resin becomes 100 ppmw or less.
- the drying method is not particularly limited, but as an example, it is preferable to dry under reduced pressure at 25°C to 35°C until the moisture content of the polylactic acid resin becomes 5,000 ppmw or less, and then dry under reduced pressure at 80 to 90°C so that the moisture content becomes 100 ppmw or less. If the moisture content exceeds 5,000 ppmw, there is a concern that hydrolysis may progress further when drying under reduced pressure at 80 to 90°C, and also there is a problem that it takes too long for the moisture content to reach 100 ppmw when drying under reduced pressure at 25°C to 35°C.
- the polylactic acid resin recovered in the above step 3 is characterized by a higher melting index and improved flowability compared to the polylactic acid resin before processing.
- the weight average molecular weight of the polylactic acid resin recovered in step 3 is 50,000 to 100,000.
- the melting index (measured according to ASTM D1238 (230°C, 2.16 kg conditions)) of the polylactic acid resin recovered in the above step 3 is 300 to 3000 g/10 min.
- the manufacturing method according to the present invention satisfies the following mathematical formula 1:
- MI 0 is the melting index of the polylactic acid resin of the above step 1 (measured according to ASTM D1238 (230°C, 2.16 kg conditions)),
- MI 1 is the melting index (measured according to ASTM D1238 (230°C, 2.16 kg conditions)) of the polylactic acid resin recovered in the above step 3.
- the manufacturing method according to the present invention satisfies the following mathematical formula 2:
- MI 0 and MI 1 are as defined in mathematical expression 1.
- the manufacturing method according to the present invention has the characteristic of being able to increase the melting index and improve the flowability through a simple method of treating polylactic acid resin with water.
- FIGS 1 and 2 show the results of experimental examples of the present invention.
- MI Melt index
- Weight-average molecular weight (Mw), number-average molecular weight (Mn), and molecular weight distribution (PDI) The weight-average molecular weight and number-average molecular weight were measured by calibrating with PC standards using Agilent 12000 series GPC. In addition, the molecular weight distribution (PDI) was calculated by dividing the weight-average molecular weight by the number-average molecular weight.
- Polylactic acid pellets were treated in the same manner as in Example 1 above, except that the temperature of the distilled water and/or the time maintained in the oven were changed as shown in Table 1 below.
- Polylactic acid (Mw: 116,700; PDI: 1.88, MI: 120 g/10 min) pellets without any separate treatment were used as a comparative example.
- the polylactic acid pellets of the comparative example (hereinafter referred to as 'A') and 2 phr of ADR-4468 (branching agent, BASF) were mixed using a Brabender mixer at 200°C and 60 rpm for 5 minutes.
- the polylactic acid pellets obtained in Example 4 (hereinafter referred to as 'B') and 2 phr of ADR-4468 (branching agent, BASF) were mixed using a Brabender mixer at 200°C and 60 rpm for 5 minutes.
- Sample A is a polylactic acid resin that has not been treated with distilled water according to the present invention, and its Mw increased by about 123% with the addition of a branching agent
- Sample B is a polylactic acid resin that has been treated with distilled water according to the present invention, and its Mw increased by about 244% with the addition of a branching agent, from which it was confirmed that the polylactic acid treated according to the present invention has significantly improved reactivity with the branching agent.
- the content of inorganic impurities in the polylactic acid pellets obtained in Examples 1 to 4 was measured by the following method.
- the analysis was performed using inductively coupled plasma optical emission spectrometry (ICP-OES), using scandium (Sc) as an internal standard, at RF power of 1300 W, plasma gas flow of 15.00 L/min, sample gas flow of 0.8 L/min, and auxiliary gas flow of 0.20 L/min.
- ICP-OES inductively coupled plasma optical emission spectrometry
- Sc scandium
- Example 1 20 50 ⁇ 5 ⁇ 75
- Example 2 30 50 ⁇ 5 ⁇ 85
- Example 3 20 60 ⁇ 5 ⁇ 85 * Sn and P are components resulting from the catalyst and stabilizer used during PLA polymerization. ** These are the results of analysis using ICP-OES.
- the polylactic acid according to the present invention is produced by hydrolysis without using any other chemical substances or catalysts, and thus has the characteristic of containing almost no inorganic impurities.
- Nonwoven fabrics were manufactured using the polylactic acid pellets obtained in Examples 1 to 3 and Comparative Examples by the following method, and the results were evaluated.
- Each polylactic acid pellet was heated and extruded, transferred to a nozzle, and spun into fibers by passing through an orifice having a diameter of 0.2 mm and a number of 32 per inch.
- a meltblown nonwoven fabric having an average fiber diameter of 15 ⁇ m or less was formed by the high temperature and high velocity gas sprayed from the injection hole around the nozzle, and the process temperature at this time was as shown in Table 4 below.
- the diameter of the nonwoven fibers was analyzed by a scanning electron microscope (SEM).
- the polylactic acid according to the present invention has a low MI and thus can be made into ultrafine particles during the melt blowing process.
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- Chemical Kinetics & Catalysis (AREA)
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- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polyesters Or Polycarbonates (AREA)
- Biological Depolymerization Polymers (AREA)
Abstract
Description
| 증류수 처리 시간 (h) | 증류수 처리 온도(℃) | MI(g/10 min) | 산도(mmol acid/kg PLA) | Mw (g/mol) | PDI | |
| 실시예 1 | 2.5 | 95 | 1500 | 55 | 60,000 | 1.86 |
| 실시예 2 | 1.5 | 95 | 650 | 42 | 72,000 | 1.90 |
| 실시예 3 | 1.0 | 95 | 450 | 35 | 77,000 | 1.92 |
| 실시예 4 | 2.5 | 90 | 400 | 30 | 83,300 | 1.89 |
| 비교예 | 0 | - | 120 | 10 | 116,700 | 1.88 |
| 시료 | MI (g/10 min) | Mw (g/mol) | PDI | 분지제 첨가에 따른 Mw 상승율1) |
| A | 120 | 116,700 | 1.88 | - |
| A + 분지제 2phr | 66 | 141,700 | 2.00 | 21 % |
| B | 400 | 83,300 | 1.89 | - |
| B + 분지제 2phr | 31 | 202,900 | 2.53 | 144 % |
| 1) 분지제 첨가에 따른 Mw 변화율(%) = (분지제 첨가 후 Mw-분지제 첨가 전 Mw)/(분지제 첨가 전 Mw) | ||||
| 함량 (mg/Kg)** | ||||
| Sn* | P* | Na, Zn, Ti, Al, Ag, Mg, Mn, Ba, Ca, Co, Cr, Cu, Fe, Ga, K, Li, Ni, Sb, Sr, V, Zr | 총 함량 | |
| 실시예 1 | 20 | 50 | < 5 | < 75 |
| 실시예 2 | 30 | 50 | < 5 | < 85 |
| 실시예 3 | 20 | 60 | < 5 | < 85 |
| * Sn 와 P는 PLA 중합시 사용된 촉매와 안정제에 기인한 성분이다. ** ICP-OES 를 이용한 분석 결과이다. |
||||
| 공정온도(℃) | 부직포 평가 결과 | |||
| 노즐 | hot-air | 중량(g/m2) | 섬유 직경(nm) | |
| 실시예 1 | 220 | 250 | 40 | 2.0 |
| 230 | 260 | 1.8 | ||
| 실시예 2 | 220 | 240 | 40 | 2.1 |
| 2.1 | ||||
| 20 | 1.5 | |||
| 1.5 | ||||
| 실시예 3 | 240 | 260 | 30 | 2.2 |
| 비교예 | 250 | 270 | 40 | 10.2 |
| 270 | 270 | 6.1 | ||
Claims (14)
- 용융지수(ASTM D1238(230℃, 2.16 kg 조건)에 의거하여 측정)가 300 내지 3000 g/10 min이고,산도가 20 내지 100 mmol Acid/kg이고, 및무기 불순물 함량이 100 mg/kg 이하인,폴리락트산 수지.
- 제1항에 있어서,상기 폴리락트산 수지의 중량 평균 분자량이 50,000 내지 100,000인,폴리락트산 수지.
- 제1항에 있어서,상기 용융지수가 300 내지 2000 g/10 min인,폴리락트산 수지.
- 제1항에 있어서,상기 산도가 30 내지 100 mmol Acid/kg인,폴리락트산 수지.
- 제1항에 있어서,상기 무기 불순물이 Sn 및 P이고,Sn 및 P의 총 함량이 85 mg/kg 이하인,폴리락트산 수지.
- 제1항에 있어서,상기 무기 불순물이 Na, Zn, Ti, Al, Ag, Mg, Mn, Ba, Ca, Co, Cr, Cu, Fe, Ga, K, Li, Ni, Sb, Sr, V, 및 Zr이고,Na, Zn, Ti, Al, Ag, Mg, Mn, Ba, Ca, Co, Cr, Cu, Fe, Ga, K, Li, Ni, Sb, Sr, V, 및 Zr의 총 함량이 10 mg/kg 이하인,폴리락트산 수지.
- 폴리락트산 수지를 물에 침지하는 단계(단계 1);상기 단계 1의 물의 온도를 65 내지 99℃로 유지하는 단계(단계 2); 및폴리락트산 수지를 물에서 회수하는 단계(단계 3)를 포함하는,제1항 내지 제6항 중 어느 한 항의 폴리락트산 수지의 제조 방법.
- 제7항에 있어서,상기 단계 1의 폴리락트산 수지의 용융지수(ASTM D1238(230℃, 2.16 kg 조건)에 의거하여 측정)는 5 내지 200 g/10 min인,제조 방법.
- 제7항에 있어서,상기 단계 1에서 상기 폴리락트산 수지와 물의 중량비는 1:0.1 내지 1:10인,제조 방법.
- 제7항에 있어서,상기 단계 2에서, 상기 물의 온도를 70 내지 99℃로 유지하는,제조 방법.
- 제7항에 있어서,상기 단계 2는 상압 하에 수행하는,제조 방법.
- 제7항에 있어서,상기 단계 2는 0.5시간 내지 24시간 동안 수행하는,제조 방법.
- 제7항에 있어서,하기 수학식 1을 만족하는,제조방법:[수학식 1]3.0 ≤ MI1/MI0 ≤24상기 수학식 1에서,MI0은 상기 단계 1의 폴리락트산 수지의 용융지수(ASTM D1238(230℃, 2.16 kg 조건)에 의거하여 측정)이고,MI1은 상기 단계 3에서 회수한 폴리락트산 수지의 용융지수(ASTM D1238(230℃, 2.16 kg 조건)에 의거하여 측정)이다.
- 제1항에 있어서,상기 단계 1의 폴리락트산 수지의 중량평균분자량은 100,000 내지 250,000인,제조 방법.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202480004129.1A CN119923427A (zh) | 2023-07-06 | 2024-06-26 | 具有改善的熔融性和反应性的聚乳酸树脂及其制备方法 |
| EP24836246.9A EP4741440A1 (en) | 2023-07-06 | 2024-06-26 | Method for preparing polylactic acid resin with improved meltability and reactivity |
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|---|---|---|---|
| KR10-2023-0087615 | 2023-07-06 | ||
| KR20230087615 | 2023-07-06 |
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| WO2025009798A1 true WO2025009798A1 (ko) | 2025-01-09 |
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| PCT/KR2024/008850 Ceased WO2025009798A1 (ko) | 2023-07-06 | 2024-06-26 | 용융성 및 반응성이 향상된 폴리락트산 수지 및 이의 제조 방법 |
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|---|---|
| EP (1) | EP4741440A1 (ko) |
| KR (1) | KR20250007981A (ko) |
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| WO (1) | WO2025009798A1 (ko) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090031801A (ko) * | 2006-07-14 | 2009-03-30 | 킴벌리-클라크 월드와이드, 인크. | 부직 웹에 사용하기 위한 생분해성 폴리락트산 |
| KR20090087517A (ko) * | 2006-12-15 | 2009-08-18 | 킴벌리-클라크 월드와이드, 인크. | 섬유 형성용 생분해성 폴리락트산 |
| US20100048081A1 (en) * | 2006-12-15 | 2010-02-25 | Topolkaraev Vasily A | Biodegradable polyesters for use in forming fibers |
| KR102245848B1 (ko) * | 2020-07-10 | 2021-04-28 | 에콜그린텍(주) | 용융흐름지수가 우수한 생분해성 pla 복합소재 및 이를 이용한 멜트 브로운 나노 극세사 부직포 제조방법 |
| KR20230030406A (ko) * | 2021-08-25 | 2023-03-06 | (주)코레쉬텍 | 당류 또는 당류의 카르복실기 치환체를 이용한 pla 개질방법 및 그 개질 pla |
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2024
- 2024-06-26 CN CN202480004129.1A patent/CN119923427A/zh active Pending
- 2024-06-26 KR KR1020240083926A patent/KR20250007981A/ko active Pending
- 2024-06-26 EP EP24836246.9A patent/EP4741440A1/en active Pending
- 2024-06-26 WO PCT/KR2024/008850 patent/WO2025009798A1/ko not_active Ceased
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090031801A (ko) * | 2006-07-14 | 2009-03-30 | 킴벌리-클라크 월드와이드, 인크. | 부직 웹에 사용하기 위한 생분해성 폴리락트산 |
| KR20090087517A (ko) * | 2006-12-15 | 2009-08-18 | 킴벌리-클라크 월드와이드, 인크. | 섬유 형성용 생분해성 폴리락트산 |
| US20100048081A1 (en) * | 2006-12-15 | 2010-02-25 | Topolkaraev Vasily A | Biodegradable polyesters for use in forming fibers |
| KR102245848B1 (ko) * | 2020-07-10 | 2021-04-28 | 에콜그린텍(주) | 용융흐름지수가 우수한 생분해성 pla 복합소재 및 이를 이용한 멜트 브로운 나노 극세사 부직포 제조방법 |
| KR20230030406A (ko) * | 2021-08-25 | 2023-03-06 | (주)코레쉬텍 | 당류 또는 당류의 카르복실기 치환체를 이용한 pla 개질방법 및 그 개질 pla |
Also Published As
| Publication number | Publication date |
|---|---|
| CN119923427A (zh) | 2025-05-02 |
| EP4741440A1 (en) | 2026-05-13 |
| KR20250007981A (ko) | 2025-01-14 |
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