Method for producing cyclic ester-modified glucan derivative

A manufacturing method, dextran technology, applied in the field of molded products, can solve problems such as rising manufacturing costs, complicated procedures, and damage to the fluidity of the product, and achieve the effects of inhibiting the formation of homopolymers and high grafting efficiency

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

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Problems solved by technology

[0010] 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

[0146] 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 is purified with dry nitrogen, a reflux condenser is installed, and 50 parts of ε-caprolactone and 67 parts of toluene (Tol) that have been dried and distilled in advance are added, heated to 130 ° C, stirred, and the cellulose acetate The ester 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 130 degreeC, stirring for 3 hours. Then, the reaction solution was co...

Embodiment 2

[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 xylene (Xyl) that have been dried and distilled in advance are added, heated to 150 ° C, stirred, and the cellulose B The acid ester 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 150 degreeC, stirring for 2 hours. Then, the reaction solution was cooled to room...

Embodiment 3

[0150]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 ethylbenzene (EB) that have been dried and distilled in advance are added, heated to 145 ° C, stirred, and the cellulose ethyl The acid ester dissolves evenly. The water content in the dissolved reaction solution was measured with a Karl Fischer moisture meter and found to be 0.02% by weight. 0.25 parts of monobutyltin trioctoate was added to this reaction liquid, and it heated at 145 degreeC, stirring for 2 hours. Then, the reaction solution was cool...

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Abstract

A process for producing a glucan derivative modified with a cyclic ester with a highly suppressed homopolymerization of a cyclic ester is provided. In a production process for a modified glucan derivative, by allowing a glucan derivative having a hydroxyl group to react with a cyclic ester in a solvent in the presence of a ring-opening polymerization catalyst to give a modified glucan derivative in which the cyclic ester is graft-polymerized to the glucan derivative, (1) the ring-opening polymerization catalyst is a metal complex which by itself does not initiate the polymerization of the cyclic ester; (2) the solvent comprises an aromatic hydrocarbon solvent having a solubility in water of not more than 10% by weight at 20 DEG C; and (3) the proportion of the solvent is not less than 60 parts by weight relative to 100 parts by weight of the glucan derivative having a hydroxyl group.

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
CPCC08G63/823C08G63/06C08G63/81C08B3/16C08L1/12C08B15/00C08G63/82
Inventor 梅本浩一片山弘
Owner DAICEL CHEM IND LTD
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