Ethyl cellulose

A cellulose derivative in which the hydroxyl groups have been ethyl-etherified. Alkali cellulose is reacted with an ethylating agent such as diethyl sulfate or ethyl chloride, generally in a heterogeneous system. Properties such as solubility and softening temperature vary depending on the degree of substitution, which is expressed as the number of etherified hydroxyl groups out of the three per glucose unit. Cellulose with a low degree of substitution (0.8 or less) is soluble in alkali, while those with a degree of substitution of 0.8 to 1.3 are water-soluble. As the degree of substitution increases, it becomes soluble in polar solvents such as alcohol and non-polar solvents, and at a degree of substitution of 2.4 to 2.5 it becomes soluble in other types of solvents. Due to its excellent solubility in solvents, compatibility with other resins, stability, water resistance, and chemical resistance, it is widely used in paints, plastics, films, etc. [CAS 9004-57-3][See other terms]Cellulose derivatives

Source: Morikita Publishing "Chemical Dictionary (2nd Edition)" Information about the Chemical Dictionary 2nd Edition

セルロースのヒドロキシ基をエチルエーテル化したもの．アルカリセルロースに硫酸ジエチルまたは塩化エチルなどのエチル化剤を一般に不均一系で反応させる．グルコース単位当たり3個あるヒドロキシ基のうち，エーテル化されたものの数で表す置換度により，溶解性，軟化温度などの諸性質が異なる．低置換度(0.8以下)のものはアルカリに可溶，置換度0.8～1.3のものは水溶性で，高置換度になるにつれて，アルコールなどの極性溶媒や無極性溶媒に可溶になり，置換度2.4～2.5において他種類の溶媒に可溶となる．この溶媒可溶性，ほかの樹脂との相溶性，安定性，耐水性，耐薬品性にすぐれることから，塗料，プラスチック，フィルムなどに広く利用されている．[CAS 9004-57-3][別用語参照]セルロース誘導体

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