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Aliphatic polyester composition and method for producing the same

一种脂肪族聚酯、制造方法的技术，应用在脂肪族聚酯组合物领域，能够解决没有发现实质性公开、共聚速度降低、得不到透明的片化物等问题

Inactive Publication Date: 2009-07-15
KUREHA KAGAKU KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the modification of polyglycolic acid by copolymerization in this way has the following problems: the copolymerization speed is significantly lower than that of glycolic acid alone (for example, the weight ratio of glycolic acid / lactic acid = 95 / 5 is lower than that of ethanol). About 1 / 3 of the acid polymerization alone, if the proportion of lactic acid increases, the copolymerization speed will further decrease, and the copolymerization itself is practically impossible), etc.
However, even when a small amount of polylactic acid was added, phase separation was clearly observed in the melt-kneaded product, and a transparent flake product could not be obtained (see Comparative Example 1 described later).
[0008] In addition, a degradable polymer composition obtained by modifying an aliphatic polyester by blending it with a modifier compatible with it has been proposed (Patent Document 3 below), but in essence this is achieved by Polylactic acid is modified (plasticized) by blending with various modifiers, but no substantive disclosure has been found regarding the modification of polyglycolic acid, especially the improvement of crystallization characteristics.

Method used

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  • Aliphatic polyester composition and method for producing the same
  • Aliphatic polyester composition and method for producing the same
  • Aliphatic polyester composition and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] 0.3 g of PLA pellets (raw material D) were dry-mixed with 29.7 g of PGA pellets (raw material A), and all of them were put into a twin-screw mixing mill (manufactured by Toyo Seiki Co., Ltd. "Labor Plus Mill") set at 240°C and melted. kneading. After 10 minutes, the polymer product was taken out as it was in a molten state. The recovery rate at this time was approximately 100%.

[0091] A part of the product in the molten state was collected into a metal frame to form a plate (size: 30mm×30mm×2mm). The YI of the plate was 18, and no coloring of the product was observed.

[0092] Next, the product was preheated at 280°C for 3 minutes with a hot press set at 280°C ("AF-50" manufactured by Shindo Metal Industry Co., Ltd.), and pressed at 5 MPa for 1 minute. , and then subjected to rapid cooling to produce a pellet (size: 150 mm×150 mm×100 μm). The obtained sheet was transparent and no phase separation was observed. As a result of DSC measurement using this sheet, it wa...

Embodiment 2

[0096] Except having set the addition amount to 29.4 g of PGA raw material A and 0.6 g of PLA raw material D, it melt-kneaded similarly to Example 1, and evaluated the product.

[0097] The pellets were heat-treated at 80° C. for 30 minutes, then placed in an environmental testing machine with temperature and humidity adjustment at 50° C. / 90% RH, and kept for 5 days. When the water resistance test was carried out, the molecular weight retention rate was 19%.

Embodiment 3

[0099] Except that the addition amount was 28.5 g of PGA raw material A and 1.5 g of PLA raw material D, and the kneading time was 15 minutes, melt kneading was carried out in the same manner as in Example 1, and the product was evaluated.

[0100] The pellets were subjected to electron microscope (SEM) observation, no phase separation (sea-island structure) was seen, and compatibility was observed.

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Abstract

The objective of the invention is that by the presence of a thermal stabilizer polyglycolic acid and polylactic acid having a weight-average molecular weight of at most 50,000 are melt-kneaded to obtain a polyglycolic acid-based aliphatic polyester composition. The aliphatic polyester composition alleviates the too fast crystallizability of polyglycolic acid which has been problematic in forming or molding of polyglycolic acid alone or in combination with another thermoplastic resin, thus showing a crystallization speed which has been lowered and can be controlled in a wide range.

Description

technical field [0001] The present invention relates to a polyglycolic acid-based aliphatic polyester composition with improved crystallization properties and a method for producing the same. Background technique [0002] Since aliphatic polyesters such as polyglycolic acid and polylactic acid can be decomposed by microorganisms or enzymes existing in nature such as soil and sea, they are attracting attention as biodegradable polymer materials with little environmental load. In addition, since aliphatic polyester has biodegradable absorbability, it is also used as a medical polymer material such as surgical sutures and artificial skin. [0003] Among aliphatic polyesters, polyglycolic acid has excellent gas barrier properties such as oxygen barrier properties, carbon dioxide barrier properties, and water vapor barrier properties, and is also excellent in heat resistance and mechanical strength. Therefore, it is used alone in packaging materials and other fields. Or it can b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L101/16
CPCC08K5/52C08J2367/04C08K5/29C08L67/04C08J3/201C08J3/203C08L2666/18
Inventor 铃木义纪山根和行佐藤浩幸渡边隆宏
Owner KUREHA KAGAKU KOGYO KK