Cellulose acetoacetate esters used in coating compositions
    2.
    发明授权
    Cellulose acetoacetate esters used in coating compositions 失效
    用于涂料组合物的乙酰乙酸纤维素酯

    公开(公告)号:US5595591A

    公开(公告)日:1997-01-21

    申请号:US609182

    申请日:1996-03-01

    CPC分类号: C09D101/10 C08B3/00 C08B3/14

    摘要: Water soluble or water-dispersible cellulose acetoacetate esters are prepared by contacting a cellulose material with diketene, an alkyl acetoacetate, 2,2,6-trimethyl-4H-1,3-dioxin-4-one or a mixture thereof and a carboxylic anhydride in a solvent system comprising lithium chloride plus a carboxamide. Compositions containing the cellulose acetoacetate esters are useful for coatings applications.

    摘要翻译: 水溶性或水分散性纤维素乙酰乙酸酯通过使纤维素材料与二烯酮,乙酰乙酸烷基酯,2,2,6-三甲基-4H-1,3-二恶英-4-酮或其混合物和羧酸酐 在包含氯化锂加甲酰胺的溶剂体系中。 含有乙酰乙酸纤维素酯的组合物可用于涂料应用。

    CROSS-METATHESIZED POLYSACCHARIDE DERIVATIVES AND PROCESSES FOR PREPARING THEM
    5.
    发明申请
    CROSS-METATHESIZED POLYSACCHARIDE DERIVATIVES AND PROCESSES FOR PREPARING THEM 审中-公开
    交联金属多糖衍生物及其制备方法

    公开(公告)号:US20160215068A1

    公开(公告)日:2016-07-28

    申请号:US15025451

    申请日:2014-09-26

    IPC分类号: C08B3/16 C08B3/14 A61K47/38

    摘要: Methods for the cross-metathesis of polysaccharides with one or more olefin-terminated side chains and cross-metathesized products are described. In an exemplary embodiment, a method for the synthesis of cellulose co-carboxyesters via olefin cross-metathesis is described. Conditions of the reactions were relatively mild and the olefin-substituted polysaccharides and the appropriate monomeric olefin partners appear to follow Grubbs rules as summarized herein. The compounds and methods may be useful for structure-property studies, particularly those aimed at developing polymers for drug delivery, such as for controlled-release drug delivery systems, controlled-release coatings, increasing bioavailability of drugs, and maintaining drug supersaturation in the GI tract.

    摘要翻译: 描述了多糖与一种或多种烯烃封端的侧链和交叉复合产物的交叉复分解方法。 在一个示例性实施方案中,描述了通过烯烃交叉复分解合成纤维素共 - 羧酸酯的方法。 反应条件相对温和,烯烃取代的多糖和适当的单体烯烃合成物似乎遵循本文总结的Grubbs规则。 化合物和方法可用于结构性质研究,特别是那些旨在开发用于药物递送的聚合物的那些,例如用于控制释放药物递送系统,控释包衣,药物的增加的生物利用度和维持GI中的药物过饱和度 道。

    Direct process for the production of cellulose esters
    6.
    发明授权
    Direct process for the production of cellulose esters 失效
    直接生产纤维素酯的方法

    公开(公告)号:US5750677A

    公开(公告)日:1998-05-12

    申请号:US367025

    申请日:1994-12-30

    摘要: The present invention relates to a process for preparing cellulose esters having a total DS/AGU of 0.1 to 3.0, said process comprising contacting the following: (i) a cellulose material, (ii) a solubilizing amount of a solvent system comprising a carboxamide diluent or a urea-based diluent, (iii) an acylating reagent, and (iv) a titanium-containing compound.

    摘要翻译: 本发明涉及一种制备总DS / AGU为0.1至3.0的纤维素酯的方法,所述方法包括使以下物质接触:(i)纤维素材料,(ii)增溶量的包含羧酰胺稀释剂 或脲基稀释剂,(iii)酰化剂,和(iv)含钛化合物。

    Process for preparing cellulose esters by use of carboxylic acids
    7.
    发明授权
    Process for preparing cellulose esters by use of carboxylic acids 失效
    使用羧酸制备纤维素酯的方法

    公开(公告)号:US5597912A

    公开(公告)日:1997-01-28

    申请号:US206236

    申请日:1994-03-04

    IPC分类号: C08B3/00 C08B3/24

    CPC分类号: C08B3/24

    摘要: Process for reducing the degree of substitution of cellulose esters employing carboxylic acids as solvolysis promoters is disclosed. Exemplary cellulose esters are cellulose acetate, cellulose propionate, cellulose butyrate, cellulose acetate propionate, and cellulose acetate butyrate.

    摘要翻译: 公开了使用羧酸作为溶剂分解促进剂降低纤维素酯的取代度的方法。 示例性纤维素酯是乙酸纤维素,丙酸纤维素,丁酸纤维素,乙酸丙酸纤维素和乙酸丁酸纤维素。