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Modified glucan derivative and molded object thereof

A technology of dextran and derivatives, applied in the direction of polarizing elements, etc., can solve problems such as low glass transition temperature, insufficient heat resistance, and damage to the good properties of cellulose acetate

Inactive Publication Date: 2009-03-18
DAICEL CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the cellulose acetate having an aliphatic polyester graft chain described in this document, the graft chain is composed of polylactide (or polylactic acid), and mechanical properties such as elasticity are insufficient.
In addition, if the amount of lactic acid (polylactic acid or polylactide) substituted on the cellulose acetate is too much, the modified cellulose acetate has a low glass transition temperature and insufficient heat resistance.
Moreover, if the amount of lactic acid substituted on cellulose acetate is too much, the inherent properties of cellulose acetate will also be reduced.
In addition, such cellulose acetate grafted with a large amount of lactic acid not only tends to change its optical properties due to heat, but also may impair the good properties of cellulose acetate.
For example, if the polymerization degree and molecular weight of the lactic acid grafted chain increase, the grafted chain part will show crystallinity, and whitening or deterioration of haze will easily occur
In this way, in terms of optical applications, no practical cellulose acetate with grafted chains has been found.

Method used

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  • Modified glucan derivative and molded object thereof
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  • Modified glucan derivative and molded object thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0125] (Preparation method of modified dextran derivative)

[0126] The modified dextran derivative of the present invention (first invention) can be obtained by reacting the dextran derivative with the aforementioned hydroxy acid component (ring-opening polymerization reaction or condensation reaction). That is, a modified dextran derivative can be produced by graft-polymerizing a hydroxy acid component on a dextran derivative. Moreover, when using a cyclic ester (such as lactide, etc.) ), and when a hydroxy acid (hydroxycaproic acid, etc.) is used as the hydroxy acid component, the grafting reaction is a condensation reaction (condensation grafting reaction). In the present invention, a ring-opening grafting reaction using a cyclic ester is generally suitably employed.

[0127] Moreover, the moisture content of the dextran derivative and the hydroxy acid component used in the graft polymerization (especially the ring-opening polymerization using a cyclic ester) is preferab...

Embodiment

[0300] Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited by these examples. Moreover, in the examples, unless otherwise mentioned, "parts" means "parts by weight".

[0301] Also, in Examples, various properties were measured as follows.

[0302] (glass transition temperature)

[0303] The glass transition temperature (Tg) was measured on the following conditions in accordance with the method of JIS K7121 using a high-sensitivity differential scanning calorimeter (manufactured by SEIKO Instruments Co., Ltd., "DSC6200").

[0304] Sample weight: 8.0mg

[0305] Nitrogen inflow: 40ml / min

[0306] Heating speed: 20°C / min

[0307] Cooling rate: 20°C / min

[0308] Measurement start temperature: 20°C

[0309] Determination termination temperature: 210°C

[0310]In addition, the glass transition temperature was measured in the same environment after placing the sample in a constant temperature and consta...

Embodiment A-1

[0333] (Synthesis of grafts)

[0334] Add 80 parts of cellulose acetate (manufactured by Daicel Chemical Industry Co., Ltd., L-20, degree of substitution: 2.41) into a reactor equipped with a stirrer and an anchor-type (いかり-type) stirring blade, and dry under reduced pressure at 110° C. and 4 Torr 4 hours. Then clean it with dry nitrogen, install a reflux cooling pipe, add 20 parts of ε-caprolactone and 67 parts of cyclohexanone (ANON) that have been dried and distilled in advance, heat to 160°C, and stir. Dissolve the cellulose acetate evenly. 0.25 part of monobutyltin trioctoate was added to this reaction liquid, and it heated at 160 degreeC for 2 hours with stirring. Then, the reaction liquid was cooled to room temperature, and the reaction was terminated to obtain a reaction product. Next, 10 parts of the reaction product were dissolved in 90 parts of chloroform, and then slowly added dropwise to 900 parts of methanol in a sufficient excess, and the precipitate (graft) ...

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Abstract

The invention provides a modified glucan derivative (e.g., modified cellulose acylate) which is suitable for use in optical applications such as optical films. The modified glucan derivative comprises a glucan derivative (e.g., cellulose acetate) and a hydroxy acid ingredient graft-polymerized therewith, wherein (1) the hydroxy acid ingredient comprises a lactone, (2) the hydroxy acid ingredient comprises an a-hydroxy acid ingredient (e.g., lactic acid or lactide) and the proportion of the hydroxy acid ingredient graft-polymerized is 0.1-5 mol on the average in terms of hydroxy acid amount per mol of the glucose units constituting the glucan derivative, or (3) the proportion of the hydroxy acid ingredient by which the glucan derivative is substituted, degree of polymerization of the graft chains, degree of substitution of the glucan derivative (e.g., degree of acetyl substitution), etc. are regulated, whereby the modified glucan derivative has a glass transition temperature of 70 DEG C or higher.

Description

technical field [0001] The present invention relates to hydroxyacid-modified glucan derivatives (such as hydroxyacid-modified cellulose acylate) which can be used in aspects such as optical applications (such as optical films, etc.), and to products made of the modified glucan derivatives. molded body (such as molded body for optics (such as optical film, etc.) etc.). In particular, the present invention relates to hydroxyacid-modified dextran derivatives (such as hydroxyacid-modified cellulose acylate) which are excellent in heat resistance and can be used in optical applications (such as optical films, etc.), and A molded body formed of a dextran derivative (such as a molded body for optics (such as an optical film, etc.) and the like). Background technique [0002] Glucans having glucose as a structural unit, such as cellulose, starch (or amylose), and α-1,6-glucan (Dekistran), do not have thermoplasticity and cannot be used as plastics (thermoplastics) as they are. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/06C08B37/00C08B15/00G02B5/30C08B15/06C08L101/16
Inventor 梅本浩一郑贵宽
Owner DAICEL CHEM IND LTD
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