Method for producing cyclic ester-modified glucan derivative

A manufacturing method and glucan technology, applied in the field of molded products, can solve the problems of complicated processes, rising manufacturing costs, and damage to the fluidity of products, and achieve the effect of high grafting efficiency

Inactive Publication Date: 2009-04-15
DAICEL CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the removal of cyclic ester oligomers represented by reprecipitation requires a large amount of solvent industrially, and the process is not generally complicated.
It also leads to an increase in manufacturing costs, which is not preferred
In addition, low-molecular-weight components that contribute to fluidity, especially grafted low-molecular-weight components, are also removed, and the fluidity of the product is impaired.

Method used

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  • Method for producing cyclic ester-modified glucan derivative

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0144] In a reactor with a stirrer and anchor-type stirring blades, add 50 parts of cellulose acetate (manufactured by Daicel Chemical Industry Co., Ltd., L-20, the average degree of substitution is 2.41, the molecular weight of each glucose unit 263.2, a specific gravity of 1.33, and an average degree of polymerization of 140), and dried under reduced pressure at 110° C. and 4 Torr (= about 530 Pa) for 4 hours. Then, the reactor was purified with dry nitrogen, a reflux condenser was installed, and 50 parts of ε-caprolactone and 67 parts of diisopropyl ketone (DIPK) that had been dried and distilled were added in advance, heated to 140 °C, stirred, and Cellulose acetate dissolves homogeneously. The moisture in the dissolved reaction solution was measured with a Karl Fischer moisture analyzer and found to be 0.02% by weight. 0.25 parts of monobutyltin trioctoate was added to this reaction liquid, and it heated at 140 degreeC, stirring for 2 hours. Then, the reaction solution ...

Embodiment 2

[0146]In the reactor with stirrer and anchor type stirring blade, add 50 parts of cellulose acetate (manufactured by Daicel Chemical Industry Co., Ltd., L-20, the average degree of substitution is 2.41, the molecular weight of each glucose unit is 263.2, The specific gravity is 1.33, and the average degree of polymerization is 140), and dried under reduced pressure at 110°C and 4 Torr for 4 hours. Then, the reactor was purified with dry nitrogen, a reflux condenser was installed, and 50 parts of ε-caprolactone and 67 parts of diisopropyl ketone (DIPK) that had been dried and distilled were added in advance, heated to 140 °C, stirred, and Cellulose acetate dissolves homogeneously. Here, water was added so that the water content in the dissolved reaction liquid was 0.1% by weight. 0.25 parts of monobutyltin trioctoate was added to this reaction liquid, and it heated at 140 degreeC, stirring for 2 hours. Then, the reaction solution was cooled to room temperature to terminate th...

Embodiment 3

[0148] In the reactor with stirrer and anchor type stirring blade, add 50 parts of cellulose acetate (manufactured by Daicel Chemical Industry Co., Ltd., L-20, the average degree of substitution is 2.41, the molecular weight of each glucose unit is 263.2, The specific gravity is 1.33, and the average degree of polymerization is 140), and dried under reduced pressure at 110°C and 4 Torr for 4 hours. Then, the reactor is purified with dry nitrogen, and a reflux condenser is installed, and 50 parts of ε-caprolactone and 67 parts of diethyl ketone (DEK) that have been dried and distilled in advance are added, heated to 125 ° C, stirred, and the fiber Acetate dissolves evenly. The moisture in the dissolved reaction solution was measured with a Karl Fischer moisture analyzer and found to be 0.02% by weight. 0.25 parts of monobutyltin trioctoate was added to this reaction liquid, and it heated at 125 degreeC, stirring for 3 hours. Then, the reaction solution was cooled to room temp...

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Abstract

Disclosed is a method for producing a cyclic ester-modified glucan derivative wherein generation of homopolymers of the cyclic ester can be highly suppressed. Specifically disclosed is a method for producing a modified glucan derivative to which a cyclic ester is graft-polymerized, wherein a glucan derivative having a hydroxyl group and a cyclic ester are reacted in a solvent in the presence of a ring-opening polymerization catalyst. In this method, (1) the ring-opening polymerization catalyst is composed of a metal complex which does not initiate polymerization of the cyclic ester by itself, and (2) the solvent is composed of a non-aromatic hydrocarbon solvent having a solubility in water at 20 DEG C of not more than 10% by weight.

Description

technical field [0001] The present invention relates to a method for efficiently producing a cyclic ester-modified glucan derivative (for example, a cellulose acylate derivative) that can be used as a thermoplastic, a modified glucan derivative obtained by the method, and A molded article formed of the modified dextran derivative. Background technique [0002] Dextran, which has glucose as a structural unit such as cellulose, starch (or amylose), and dextran (dextran), is not thermoplastic and cannot be directly used as a plastic (thermoplastic). Accordingly, such glucans (in particular, cellulose) can be used as thermoplastics by acylation (acetylation, etc.) to achieve thermal plasticization. [0003] Among the above-mentioned glucans, cellulose is particularly acylated to form cellulose acylate (especially cellulose acetate), which can be used in various applications. For example, from the viewpoint of thermoplasticity, cellulose acetate (cellulose diacetate) having an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/00C08G63/82
CPCC08G63/823C08B3/16C08G63/81C08G63/06C08B15/00C08G63/82
Inventor 梅本浩一片山弘
Owner DAICEL CHEM IND LTD
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