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Process for purifying lactide formed through ring-opening polymerization

A technology of ring-opening polymerization and purification method, which is applied in the production field of cyclic diesters, can solve the problems such as insufficient effect, and achieve the effects of excellent purification yield, excellent biodegradability and heat resistance

Inactive Publication Date: 2005-08-31
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not work well enough

Method used

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  • Process for purifying lactide formed through ring-opening polymerization
  • Process for purifying lactide formed through ring-opening polymerization
  • Process for purifying lactide formed through ring-opening polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0138]In a polymerization vessel equipped with a stirring device and nitrogen inlet and outlet pipes, a toluene solution of 20.0 g of L-lactide, 114 g of stearic acid and 6 mg of tin(I) octoate was added to obtain a mixture. The mixture was dried under reduced pressure for 2 hours, and then heated to 200° C. under a small nitrogen stream to carry out ring-opening polymerization. The reaction mixture became viscous immediately. After 1 hour the reaction was complete and the polymer was removed from the reaction vessel.

[0139] The resulting polymer had a reduced viscosity of 1.70, a temperature at 10% weight loss of 321°C and a melting point of 177°C. The polymer exhibited satisfactory melt stability (i.e. VMR = 95%), and d-chloroform was used as solvent for the polymer 1 H-NMR spectrum analysis, the result confirmed that there is a terminal stearyl peak (1.23ppm).

Embodiment 2

[0141] A polymer was prepared in the same manner as in Example 1 except that 20.0 g of L-lactide and 228 mg of stearic acid were used.

[0142] The reduced viscosity of the obtained polymer was 0.84, the temperature at 10% weight reduction was 310°C, and the melting point was 176°C. The polymer exhibited satisfactory melt stability (ie VMR = 90%). The polymer was prepared using d-chloroform as solvent 1 H-NMR spectrum analysis, the result confirmed that there is a terminal stearyl peak.

Embodiment 3

[0144] A polymer was prepared in the same manner as in Example 1 except that 20.0 g of L-lactide and 28 mg of stearic acid were used.

[0145] The reduced viscosity of the obtained polymer was 1.77, the temperature at 10% weight reduction was 315°C, and the melting point was 180°C. The polymer exhibited satisfactory melt stability (ie VMR = 96%). The polymer was prepared using d-chloroform as solvent 1 H-NMR spectrum analysis, the result confirmed that there is a terminal stearyl peak.

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Abstract

A polymer having a blocked terminal group according to the present invention, represented by the following Formula (I): (I) where R is an alkylene group containing 1 to 20 carbon atoms; X1 is an acyl group containing 2 to 50 carbon atoms; Y is H, an alkyl group containing 1 to 50 carbon atoms or an alkenyl group containing 1 to 50 carbon atoms; m is a positive integer; and n1 is 0 or a positive integer.

Description

[0001] This application is a divisional application of the patent application filed on August 20, 1999, with the application number 99117996.X, entitled "Method for producing cyclic diesters for producing polymers containing lactic acid structural units". technical field [0002] The present invention relates to biodegradable plastics and methods for their production, more particularly to polymers containing lactic acid structural units and methods for their production, and more particularly to methods for the production of cyclic diesters used in the production of such polymers. Background technique [0003] Non-degradable plastic wastes cause environmental damage, and biodegradable plastics have been extensively developed and researched in recent years. Biodegradable plastics can be decomposed by microorganisms, enzymes or the like, and examples of biodegradable plastics include polyesters such as poly[(R)-3-hydroxybutyrate] and polycaprolactone, and Polyesters made from a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/08C08G63/82
CPCC08G63/823C08G63/08
Inventor 木村邦生伊藤武青山知裕宇野敬一堀田清史有地美奈子
Owner TOYOBO CO LTD