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Polyether-polylactic acid composition and polylactic acid film containing same

A technology of polylactic acid and composition, applied in the field of polyether-polylactic acid composition, to achieve the effects of excellent exudation resistance, excellent melt stability and little odor

Active Publication Date: 2009-03-11
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the polyether-polylactic acid composition described in Patent Document 6 has certain characteristics, the current situation is to seek higher storage stability and melt stability.

Method used

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  • Polyether-polylactic acid composition and polylactic acid film containing same

Examples

Experimental program
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Effect test

Embodiment 1

[0224] 63.3% by weight of polyethylene glycol (number-average molecular weight: 10,000) was dehydrated under reduced pressure at 140°C for 30 minutes, then 36.7% by weight of L-lactide was added, and the atmosphere was replaced with an inert gas. or melt mixing for 20 minutes, and 0.1% by weight of tin octoate was added as an esterification catalyst.

[0225] Then, it was stirred at 160° C. for 2 hours in a nitrogen atmosphere, and after the reaction was completed, 0.075% by weight of phosphoric acid crystals were added and stirred for 20 minutes to obtain a composition. From the results of the GPC measurement, it was confirmed that the number average molecular weight was larger than that of the raw material polyethylene glycol, and the number average molecular weight was 22,000 (polystyrene conversion) lactic acid-based polyester.

[0226] The peak of GPC is single, and a single copolymer is produced. Residual lactide was 2.2% by weight. Residual lactide in the lactic acid-...

Embodiment 2

[0228] 77.5% by weight of polyethylene glycol (number-average molecular weight: 20,000) was dehydrated under reduced pressure at 140°C for 30 minutes, then 22.5% by weight of L-lactide was added, and the atmosphere was replaced with an inert gas. or melt mixing for 20 minutes, and 0.15% by weight of tin octoate was added as an esterification catalyst.

[0229] Then, it was reacted at 160 degreeC in nitrogen atmosphere for 2 hours, and after completion|finish of reaction, 0.09 weight% of phosphorous acid was added, and it stirred for 20 minutes, and obtained the composition. From the results of GPC, it was confirmed that the number average molecular weight was larger than that of the raw material polyethylene glycol, and the number average molecular weight was 30,000 (polystyrene conversion) lactic acid-based polyester.

[0230] The peak of GPC is single, and a single copolymer is produced. Residual lactide was 2.2% by weight. Residual lactide in the lactic acid-based polyest...

Embodiment 3

[0232] 63.3% by weight of polyethylene glycol (number-average molecular weight: 10,000) was dehydrated under reduced pressure at 140°C for 30 minutes, then 41.1% by weight of L-lactide was added, and the atmosphere was replaced with an inert gas. or melt mixing for 20 minutes, and 0.1% by weight of tin octoate was added as an esterification catalyst.

[0233] Then react at 160° C. for 2 hours, add 0.28% by weight of dimethyl phosphate after the reaction, and stir for 20 minutes to synthesize a polyether-polylactic acid composition. It was confirmed that it was a composition with a number average molecular weight of 21,000 (in terms of polystyrene). Residual lactide was 2.8%. Residual lactide in the lactic acid-based polyester composition (polyether-polylactic acid composition) was removed at a vacuum degree of 4 torr at 160°C. After 40 minutes, lactide became 0.3% by weight. The acid value was 10 equivalent / ton, and no decrease in the number average molecular weight was obs...

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Abstract

Disclosed is a polyether-polylactic acid composition which is excellent in storage stability and melt stability while having a good hue. Specifically disclosed is a polyether-polylactic acid composition which is a compound containing a polyether and a polylactic acid content. This polyether-polylactic acid composition is characterized by having a residual lactide amount of not more than 0.3% by weight and an acid number of not more than 50 equivalent weight / t.

Description

technical field [0001] The present invention relates to a polyether-polylactic acid composition containing polyether and polylactic acid components having excellent storage stability and melt stability, low odor, and good color tone, and a polylactic acid-based film containing the polyether-polylactic acid composition . Background technique [0002] In recent years, from the perspective of plastic waste disposal problems, environmental problems, etc., research on the use of polylactic acid, which is a plant raw material, with excellent biodegradability, as a general-purpose polymer has been active, and there have been many studies related to its composition. ,patent application. However, since polylactic acid has a low glass transition temperature of 60°C and is a hard and brittle polymer, homopolymers should be used directly as general-purpose polymers in various applications, and there are issues that must be overcome. [0003] For example, when used in film and sheet a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/66C08G63/88C08J5/18C08K3/32C08K5/521C08L67/04C08L101/16
CPCC08K5/521C08J2367/04C08G2261/126C08K3/32C08J5/18C08G63/664C08L67/04C08L71/00
Inventor 仲村博门松本太成木村将弘
Owner TORAY IND INC
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