Biodegradable aliphatic polyester composition, method for producing the same, and uses
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- KINGFA SCI & TECH CO LTD
- Filing Date
- 2023-11-22
- Publication Date
- 2026-06-23
Smart Images
Figure 2026520493000001_ABST
Abstract
Claims
1. A biodegradable aliphatic polyester composition, (i) A biodegradable aliphatic polyester comprising (A) a dicarboxylic acid compound and (B) 1,4-butanediol in an amount equal to or equal to (A), (ii) A cyclic esterified compound comprising the compounds represented by formulas (I) and (II), Includes, Equation (I), Formula (II) The aforementioned component (A) is based on the total molar amount of component (A), (a1) 65 to 95 mol% succinic acid or its ester derivative, or a mixture thereof, (a2) comprising 5 to 35 mol% of adipic acid or its ester derivative, or a mixture thereof, The total content of the cyclic esterified structures represented by formulas (I) and (II) is 538 to 1100 ppm, based on the total weight of the biodegradable aliphatic polyester composition. A biodegradable aliphatic polyester composition characterized in that the total volatile organic compound (TVOC) content of the biodegradable aliphatic polyester composition is 157 ppm or less.
2. In the above-mentioned component (A), with respect to the total molar amount of component (A), (a1) 72 to 82 mol% succinic acid or its ester derivative, or a mixture thereof, (a2) 18 to 28 mol% of adipic acid or its ester derivative, or a mixture thereof, A biodegradable aliphatic polyester composition according to claim 1, characterized by containing the following:
3. The biodegradable aliphatic polyester composition according to claim 1, characterized in that the total content of cyclic esterified products having the structures represented by formulas (I) and (II) is 538 to 850 ppm based on the total weight of the biodegradable aliphatic polyester composition.
4. The biodegradable aliphatic polyester composition according to claim 1, further comprising a chain extender, wherein the content of the chain extender is 0.05 to 2.0% by weight based on the total weight of the biodegradable aliphatic polyester composition.
5. The chain elongator is (c1) Isocyanate, (c2) peroxide, (c3) Epoxide, (c4) Oxazolines, oxazines, caprolactams and / or carbodiimides The biodegradable aliphatic polyester composition according to claim 4, characterized by containing one or more selected from the group consisting of the following.
6. The biodegradable aliphatic polyester composition according to claim 1, further comprising a crosslinking agent having at least three functional groups, wherein the content of the crosslinking agent is 0 to 3% by weight based on the total weight of the biodegradable aliphatic polyester composition.
7. The biodegradable aliphatic polyester composition according to claim 6, characterized in that the crosslinking agent having at least three functional groups is at least one selected from the group consisting of trimethylolpropane, pentaerythritol, and glycerol.
8. A method for producing a biodegradable aliphatic polyester composition according to any one of claims 1 to 7, Step S1 involves mixing component (a1) and a portion of component (B), adding or not adding a catalyst to obtain slurry A, and then esterifying or transesterifying slurry A until the intrinsic viscosity of the esterification product, as measured according to GB / T 17931-1999, is 0.05 to 0.12 dL / g. Step S2 involves mixing component (a2) with the remaining component (B), adding or not adding a catalyst to obtain slurry B, and then esterifying or transesterifying slurry B until the intrinsic viscosity of the esterification product, as measured according to GB / T 17931-1999, is 0.05 to 0.14 dL / g. Step S3 involves mixing the esterification products obtained in steps S1 and S2 to obtain a mixture of esterification products, pre-condensing this mixture until the intrinsic viscosity of the pre-condensed product, measured according to GB / T 17931-1999, is 0.30 to 0.55 dL / g. Step S4 involves condensing the preliminary condensation product obtained in step S3 until the intrinsic viscosity of the condensation product, measured according to GB / T 17931-1999, is 1.18 to 1.85 dL / g. Step S5 involves pelletizing the condensation product obtained in step S4 to obtain polyester particles, and then contacting the polyester particles with an organic solvent or an aqueous solution thereof. Step S6 involves drying the product treated in step S5 and performing solid-phase condensation to obtain the biodegradable aliphatic polyester composition, A manufacturing method characterized by including the following.
9. After step S4, before step S5, The manufacturing method according to claim 8, further comprising step S4', in which the condensation product obtained in step S4 is mixed with a chain extender, a chain extension reaction is carried out, and the chain extension product obtained through the chain extension reaction has an intrinsic viscosity of 1.30 to 1.92 dL / g as measured in accordance with GB / T 17931-1999.
10. The manufacturing method according to claim 8, characterized in that it satisfies at least one of the following (1) to (5). (1) In step S3, the intrinsic viscosity of the preliminary condensation product, measured in accordance with GB / T 17931-1999, is 0.35 to 0.48 dL / g. (2) In step S5, the temperature of the contact treatment is 35 to 50°C. (3) In step S5, the time of the contact treatment is 5 to 20 hours. (4) In step S5, the mass ratio of the polyester particles to the organic solvent or aqueous solution thereof is 1:(1 to 10), and the mass percentage concentration of the aqueous solution of the organic solvent is 35 to 90% by weight. (5) In step S6, the temperature of the solid phase condensation is 65 to 95°C, the time of the solid phase condensation is 8 to 16 hours, and the pressure of the solid phase condensation is 0.3 to 6 mbar.
11. A biodegradable mixture, (I) A biodegradable aliphatic polyester composition according to any one of claims 1 to 7, (II) At least one component selected from the group consisting of aliphatic-aromatic copolymer polyesters, aliphatic polyesters, starch, cellulose, polyhydroxyalkanoates, polyglycolic acid, and polylactic acid, (III) Talc and, (IV) Contains calcium carbonate, The content of component (I) is 5 to 95% by weight, based on the total weight of components (I) and (II). The content of component (II) is 5 to 95% by weight, based on the total weight of components (I) and (II). The content of component (III) is 0 to 35% by weight, based on the total weight of components (I) to (IV). The content of component (IV) is 0 to 20% by weight, based on the total weight of components (I) to (IV). A biodegradable mixture characterized by the following:
12. Use of the biodegradable aliphatic polyester composition according to any one of claims 1 to 7 in the field of manufacturing food packaging films and food packaging bags.
13. The use according to claim 12, characterized in that the thickness of the food packaging film is 8 μm to 50 μm and satisfies at least one of the following (1) to (3). (1) The migration resistance level of the food packaging film is 4 or less. (2) The static friction coefficient (COF) of the food packaging film is 6.2 or higher. (3) The degree of cloudiness of the food packaging film is 18% or less.