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公开(公告)号：EP0952160B1
公开(公告)日：2004-03-31
申请号：EP98107136.8
申请日：1998-04-20
CPC分类号： C08J5/18 , C08B3/06 , C08J2301/12
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2.发明公开Cellulose triacetate and method for its production 失效Cellulosetriacetat和Verfahren zu deren Herstellung
公开(公告)号：EP0952160A1
公开(公告)日：1999-10-27
申请号：EP98107136.8
申请日：1998-04-20
CPC分类号： C08J5/18 , C08B3/06 , C08J2301/12
摘要： A cellulose triacetate with an average degree of acetylation of 58 to 62.5% is produced by acetylating a low-purity pulp with a mannose/xylose ratio of 0.35 of 3.0 (by mole) in terms of sugars, an α-cellulose content of 90 to 97 weight %, and a total content of mannose and xylose content of 2 to 6 mole %. The releasability of a cast film from a support can be improved by using a cellulose triacetate having a mannose/xylose ratio of 0.35 to 3.0 (by mole). By using 400 to 500 parts by weight of acetic acid per 100 parts by weight of the pulp in the acetylation step and/or treating cellulose triacetate with an oxidizing agent, the optical characteristics of the cellulose triacetate can be improved. By the method of the invention, a cellulose triacetate having a high releasability after casting and excellent optical characteristics can be produced from a pulp of low purity.
摘要翻译： 平均乙酰化度为58〜62.5％的三乙酸纤维素通过乙糖化甘油糖/木糖比例为0.35（摩尔％）的甘油/木糖比例（以α-糖为单位），α-纤维素含量为90〜 97重量％，甘露糖和木糖含量的总含量为2〜6摩尔％。 通过使用甘露糖/木糖比为0.35〜3.0（摩尔）的三乙酸纤维素，可以提高流动膜从载体的脱模性。 通过在乙酰化步骤中每100重量份的纸浆使用400至500重量份的乙酸和/或用氧化剂处理纤维素三乙酸酯，可以改善三乙酸纤维素的光学特性。 通过本发明的方法，可以从低纯度的纸浆生产出铸造后具有高脱模性和优异的光学特性的三乙酸纤维素。
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