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发明授权
CN105073782B 低取代度乙酸纤维素 有权

低取代度乙酸纤维素
摘要：
本发明的乙酸纤维素为乙酰基总取代度为0.4～1.1的乙酸纤维素，且以下述定义的组成分布指数(CDI)为3.0以下。CDI＝(组成分布半峰宽的实测值)/(组成分布半峰宽的理论值)。组成分布半峰宽的实测值：对将乙酸纤维素(试样)的残存羟基全部丙酰化而得到的乙酸丙酸纤维素进行HPLC分析而求出的组成分布半峰宽。下述式中，DS为乙酰基总取代度，DPw为重均聚合度(使用将乙酸纤维素(试样)的残存羟基全部丙酰化而得到的乙酸丙酸纤维素，通过GPC‑光散射法求出的值)。组成分布半峰宽的理论值 = 2.35482 3 × D P w × ( D S / 3 ) × ( 1 - D S / 3 ) / D P w
摘要（英）：

A cellulose acetate according to the present invention has a total degree of acetyl substitution of 0.4 to 1.1 and has a compositional distribution index (CDI) of 3.0 or less, where the CDI is specified by the formula: CDI = Measured value of half height width of chemical composition / Theoretical value of half height width of chemical composition where the measured value of half height width of chemical composition is a half height width of chemical composition determined by analyzing a cellulose acetate propionate by HPLC, where the cellulose acetate propionate is prepared by propionylating all residual hydroxy groups of the cellulose acetate (sample); and Theoretical value of half height width of chemical composition = 2.35482 �¢ 3 * DPw * DS / 3 * 1 - DS / 3 / DPw where DS is the total degree of acetyl substitution; and DPw is a weight-average degree of polymerization determined by a GPC-light scattering method using a cellulose acetate propionate prepared by propionylating all residual hydroxy groups of the cellulose acetate (sample).

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