Polyester resin composition and molded article of same

A technology of polyester resin and composition, which is applied in the field of polyester resin composition containing glycolic acid resin and its molded body, which can solve the problem that the decomposition speed is not necessarily sufficient, and achieve the effect of excellent decomposability

Active Publication Date: 2014-10-15
KUREHA KAGAKU KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, although glycolic acid-based resins exhibit good decomposability at high temperatures (for example, 60°C or higher),

Method used

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  • Polyester resin composition and molded article of same
  • Polyester resin composition and molded article of same
  • Polyester resin composition and molded article of same

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0097] Example

[0098] Hereinafter, the present invention will be described in more detail based on examples and comparative examples, but the present invention is not limited to the following examples. The characteristics of the resin used in the examples, the obtained polyester resin composition, etc., were measured by the following methods.

[0099]

[0100] The molecular weight of the resin (polyglycolic acid, polylactic acid, etc.) is determined by gel permeation chromatography (GPC) under the following conditions.

[0101] (GPC measurement conditions)

[0102] Installation: "Shodex-104" manufactured by Showa Denko Corporation

[0103] Column: 2 HFIP-606M are connected in series with 1 HFIP-G as a pre-column

[0104] Column temperature: 40℃

[0105] Mobile phase: Hexafluoroisopropanol (HFIP) solution dissolved with 5mM sodium trifluoroacetate

[0106] Flow rate: 0.6ml / min

[0107] Detector: RI (differential refractive index) detector

[0108] Molecular weight calibration: use 5 standa...

Example Embodiment

[0117] [Example 1]

[0118] To 100 parts by mass of polyglycolic acid (PGA, "Kuredux" manufactured by Kureha Co., Ltd., weight average molecular weight (Mw) 176,000), 1 part by mass of 3,3',4,4'-benzophenonetetracarboxylic dianhydride ( BTDA), supplied to the feed section of a two-axis kneading extruder ("2D25S" manufactured by Toyo Seiki Co., Ltd.) whose screw section temperature is set to 200-240°C, and melt-kneaded to obtain pellet-like polyglycolic acid Resin composition. With respect to this polyglycolic acid resin composition, a decomposability test was conducted according to the method described above, and the mass reduction rate after being kept at 40°C for 2 weeks was determined. The results are shown in Table 1.

[0119] [Example 2-6]

[0120] Except that the addition amount of BTDA was changed to the amount shown in Table 1, everything else was the same as in Example 1 to prepare a pellet-like polyglycolic acid resin composition. With respect to the obtained polyglycol...

Example Embodiment

[0125] [Example 11-14]

[0126] In addition to adding 100 parts by mass of phthalic anhydride (Example 11), ethylene glycol double dehydrated trimellitate (TMEG) (Example 12), dianhydride butane tetracarboxylic acid (BT) (Example 13), or phenylsulfone tetra Carboxy dianhydride (DSDA) (Example 14) was substituted for BTDA, and the rest were the same as Example 1, and prepared into a pellet-like polyglycolic acid resin composition. With respect to the obtained polyglycolic acid resin composition, a decomposability test was conducted according to the method described above, and the mass reduction rate after being kept at 40°C for 1 week (Example 11) and 2 weeks (Example 11-14) was determined. The results are shown in Table 1.

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Abstract

This polyester resin composition contains 100 parts by mass of a polyester resin that includes at least 50% by mass of a glycolic acid resin and 0.5-50 parts by mass of a carboxylic acid anhydride.

Description

technical field [0001] The present invention relates to a polyester resin composition and its molded body, more specifically, to a polyester resin composition containing a glycolic acid resin and its molded body. Background technique [0002] Aliphatic polyesters such as polyglycolic acid and polylactic acid are attracting attention as biodegradable polymer materials with little environmental load because they can be decomposed by microorganisms or enzymes existing in nature such as soil and ocean. In addition, these aliphatic polyesters are not only biodegradable but also hydrolyzable, and their applications in various fields have been actively studied in recent years. [0003] Among aliphatic polyesters, polyglycolic acid (hereinafter also referred to as "PGA") is excellent in gas barrier properties, heat resistance, and mechanical strength, so it is used as a packaging material for foods that are easily oxidatively deteriorated, and as a material for easy composting. In ...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K3/32C08K5/09C09K8/62C08L101/16
CPCC08K5/521C08K5/1539C09K8/68C08K3/32C08K5/09C09K8/516C09K8/70C08L67/04C08K5/51C09K8/5086C08L67/02C09K8/24C09K8/44
Inventor 正木崇士山崎昌博小林卓磨佐藤浩幸
Owner KUREHA KAGAKU KOGYO KK
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