Cellulose ethers and method for producing the same
    3.
    发明授权
    Cellulose ethers and method for producing the same 有权
    纤维素醚及其制备方法

    公开(公告)号:US06482940B1

    公开(公告)日:2002-11-19

    申请号:US09446998

    申请日:1999-12-30

    IPC分类号: C08B1100

    摘要: A cellulose ether that is predominantly substituted in the C3 position of the anhydroglucose unit of the cellulose is described. In an embodiment of the present invention, the partial degree of substitution in the C3 position of the cellulose ether is ≧60%, based on the total degree of substitution. Also described is a process for preparing the cellulose ether of the present invention. The process involves, reacting cellulose, dissolved in N-methylmorpholine-N-oxide monohydrate (NMMNO) and optionally other inert organic solvents, with alkylation reagents. The reaction takes place in the presence of: (i) an insoluble solid phase catalyst, e.g., solid ion exchange resins based on polystyrene having quaternary ammonium groups; (ii) stabilizers, e.g., propyl gallate; and (iii) optionally additional soluble co-catalysts, e.g., trimethylbenzylammonium hydroxide.

    摘要翻译: 描述了主要在纤维素的脱水葡萄糖单元的C3位置取代的纤维素醚。 在本发明的一个实施方案中,基于总取代度,纤维素醚的C3位置的部分取代度为> = 60%。 还描述了制备本发明的纤维素醚的方法。 该方法涉及将溶解在N-甲基吗啉-N-氧化物一水合物(NMMNO)和任选的其它惰性有机溶剂中的纤维素与烷基化试剂反应。 该反应在以下存在下进行:(i)不溶性固相催化剂,例如基于具有季铵基团的聚苯乙烯的固体离子交换树脂; (ii)稳定剂,例如没食子酸丙酯; 和(iii)任选的另外的可溶性助催化剂,例如氢氧化三甲基苄基铵。