利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

15 条记录 (耗时 0.028 秒)

    Process for esterification of cellulose using as the catalyst the combination of sulfuric acid, phosphoric acid and a hindered aliphatic alcohol
    11.
    发明授权
    Process for esterification of cellulose using as the catalyst the combination of sulfuric acid, phosphoric acid and a hindered aliphatic alcohol 失效
    使用硫酸，磷酸和受阻脂肪醇的组合作为催化剂的纤维素的酯化方法

    公开(公告)号：US4480090A

    公开(公告)日：1984-10-30

    申请号：US544187

    申请日：1983-10-21

    申请人： Chung-Ming Kuo ,  Alan P. Leonard

    发明人： Chung-Ming Kuo ,  Alan P. Leonard

    IPC分类号： C08B3/02

    CPC分类号： C08B3/02

    摘要： The present invention relates to a method of preparing lower fatty acid esters of cellulose which comprises esterifying at a temperature of between about 75.degree. C. and about 110.degree. C. a cellulose compound having esterifiable hydroxyl groups with an esterifying bath comprising an organic acid anhydride, a diluent, and a catalyst comprising from 0.2 to 2.0 parts phosphoric acid, from 0.1 to 1.2 parts sulfuric acid, and from 0.05 to 0.6 parts of a hindered aliphatic alcohol by weight per 100 parts of the cellulose to be esterified.

    摘要翻译： 本发明涉及一种制备纤维素的低级脂肪酸酯的方法，其包括在约75℃至约110℃的温度下酯化具有可酯化羟基的纤维素化合物与含有机酸酐的酯化浴 ，稀释剂和催化剂，其包含0.2至2.0份磷酸，0.1至1.2份硫酸和0.05至0.6份受阻脂肪醇，每100份待酯化的纤维素。

    Carboxylated cellulose esters
    14.
    发明授权
    Carboxylated cellulose esters 失效
    羧化纤维素酯

    公开(公告)号：US5973139A

    公开(公告)日：1999-10-26

    申请号：US19554

    申请日：1998-02-06

    申请人： Benedict Moonsang Lee ,  Chung-Ming Kuo ,  Jessica Posey-Dowty ,  Larry Gerald Curtis

    发明人： Benedict Moonsang Lee ,  Chung-Ming Kuo ,  Jessica Posey-Dowty ,  Larry Gerald Curtis

    IPC分类号： C08B3/06 ,  C08B3/18 ,  C08B15/04 ,  C09D11/00 ,  C09D11/14 ,  C09D17/00 ,  C09D101/02 ,  C09D101/12 ,  C09D101/14 ,  C08B3/00 ,  C08B3/16 ,  C08L1/04 ,  C08L1/08

    CPC分类号： C08B3/06 ,  C08B15/04 ,  C08B3/18 ,  C09D101/02 ,  C09D101/12 ,  C09D101/14 ,  C09D11/14 ,  C09D17/00

    摘要： A process for preparing a carboxylated cellulose ester from oxidized cellulose is described. The carboxylated cellulose esters have improved solvent solubility and coating resin compatibility when compared to cellulose esters made from regular grade cellulose. The process comprises activating the oxidized cellulose with water. The activated oxidized cellulose is then dehydrated by displacing the water with acetic acid and optionally displacing at least some of the acetic acid with butyric acid or propionic acid. After dehydration the activated cellulose is reacted with an esterifying reagent in the presence of a catalyst at about 0.degree. C. The temperature is gradually increased to a level sufficient to complete reaction and to obtain an intrinsic viscosity ranging from about 0.2 to about 1.6 dl/g. The reacted solution is then hydrolyzed to obtain a hydroxyl content ranging from about 0.05 to about 1.0. The catalyst is neutralized with a neutralizing agent and the solution is optionally filtered and the carboxylated cellulose ester is then precipitated with a precipitating agent. The invention also relates to carboxylated cellulose esters prepared by the process described above as well as high solids coating compositions containing carboxylated cellulose esters made by the above process.

    摘要翻译： 描述了由氧化纤维素制备羧化纤维素酯的方法。 当与常规级纤维素制成的纤维素酯相比时，羧化纤维素酯具有改善的溶剂溶解性和涂料树脂相容性。 该方法包括用水活化氧化的纤维素。 然后将活化的氧化纤维素通过用乙酸置换水而脱水，并任选地用丁酸或丙酸置换至少一些乙酸。 脱水后，活化纤维素在约0℃下在催化剂存在下与酯化试剂反应。温度逐渐升高到足以完成反应的水平，得到约0.2至约1.6dl / G。 然后将反应的溶液水解，得到约0.05至约1.0的羟基含量。 用中和剂中和催化剂，任选地过滤溶液，然后用沉淀剂沉淀羧化纤维素酯。 本发明还涉及通过上述方法制备的羧化纤维素酯以及通过上述方法制备的含有羧化纤维素酯的高固含量涂料组合物。

    PH-sensitive coatings based on cellulose acetoacetate
    15.
    发明授权
    PH-sensitive coatings based on cellulose acetoacetate 失效
    基于乙酰乙酸纤维素的PH敏感涂料

    公开(公告)号：US5811121A

    公开(公告)日：1998-09-22

    申请号：US790644

    申请日：1997-01-29

    申请人： Stephen Hong-Wei Wu ,  Chung-Ming Kuo

    发明人： Stephen Hong-Wei Wu ,  Chung-Ming Kuo

    IPC分类号： A61K9/28 ,  A61K9/36 ,  B01J13/02

    CPC分类号： B01J13/02 ,  A61K9/2866

    摘要： This invention is based on the discovery that certain cellulose acetoacetate mixed esters will remain insoluble in mild (near-neutral) or acidic aqueous solutions, but dissolve under alkaline conditions. The esters are particularly useful as coatings for controlled-release applications. Coatings comprising these esters will dissolve to release a coated active agent under alkaline conditions, the exact pH at which dissolution occurs being adjustable.

    摘要翻译： 本发明基于以下发现：某些乙酰乙酸纤维素混合酯在温和（近中性）或酸性水溶液中保持不溶，但在碱性条件下溶解。 这些酯特别适用于控制释放应用的涂层。 包含这些酯的涂层将在碱性条件下溶解以释放包被的活性剂，发生溶解的确切pH是可调节的。