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    • 4. 发明申请
    • Lactic acid polymer and process for producing the same
    • 乳酸聚合物及其制备方法
    • US20030153724A1
    • 2003-08-14
    • US10344131
    • 2003-04-03
    • Kohei YamamotoTsutomu TaniTakashi AokiYoshio Hata
    • C08G063/08
    • A61K38/09A61K9/1647A61K9/5031A61K47/34C08G63/08C08G63/88C08G63/912Y10S514/963Y10S514/965
    • A process for producing a lactic acid polymer of 15,000 to 50,000 in weight-average molecular weight, the content of polymeric materials having not more than about 5,000 in weight-average molecular weight therein being not more than about 5% by weight, characterized by hydrolyzing a high molecular weight lactic acid polymer, placing the resultant solution comprising the hydrolyzed product under a condition capable of precipitating the objective lactic acid polymer, separating the precipitated lactic acid polymer and collecting them. The lactic acid polymer is useful as a matrix for sustained-release preparations. The sustained-release microcapsule preparation encapsulating a physiologically active substance can fully prevent the initial excessive release of the physiologically active substance from the microcapsules and keep a stable release rate over a long period of time.
    • 一种生产重均分子量为15,000至50,000的乳酸聚合物的方法,其中重均分子量不超过约5,000的聚合物材料的含量不超过约5重量%,其特征在于水解 高分子量乳酸聚合物,将包含水解产物的所得溶液置于能够沉淀目标乳酸聚合物的条件下,分离沉淀的乳酸聚合物并收集它们。 乳酸聚合物可用作缓释制剂的基质。 包封生理活性物质的缓释微胶囊制剂可以充分地防止生物活性物质从微胶囊的初始过度释放,并在长时间内保持稳定的释放速率。
    • 5. 发明申请
    • Hydrogel-forming system with hydrophobic and hydrophilic components
    • 具有疏水和亲水组分的水凝胶形成体系
    • US20030125509A1
    • 2003-07-03
    • US10369676
    • 2003-02-21
    • Chee-Youb WonYeli ZhangChih-Chang Chu
    • C08G063/08
    • C08L5/02A61K9/205A61K47/36C08B37/0021C08G18/6484C08G18/8108C08G2210/00C08L67/07Y10S525/937C08L2666/02C08L2666/26
    • A hydrogel forming system which comprises a hydrophobic macromer with unsaturated group terminated ends and a hydrophilic polymer which is a polysaccharide containing hydroxyl groups which are reacted with unsaturated group introducing compound, is convertible by free radical polymerization to form a hydrogel containing a three dimensional crosslinked polymer network containing hydrophobic and hydrophilic components. Preferably, the hydrophobic polymer is prepared by reacting the hydroxyls of a diol obtained by converting hydroxy of terminal carboxylic acid group of poly(lactic acid) to aminoethanol group, with an unsaturated group introducing compound which is acryloyl chloride or isocyanate having an unsaturated group at one end of the molecules. Preferably, the hydrophilic polymer is dextran wherein one or more hydroxyls in a glucose unit of the dextran is (are) reacted with an unsaturated group introducing compound which is acryloyl chloride or isocyanate having an unsaturated group at one end of a molecule. Agent can be entrapped in the polymer network, e.g., drugs, water-soluble macromolecules or synthetic or natural polymers, for controlled release therefrom.
    • 包含具有不饱和基团末端的疏水性大分子单体和亲水性聚合物的水凝胶形成体系,其是含有与不饱和基团导入化合物反应的羟基的多糖,可通过自由基聚合反应形成含有三维交联聚合物的水凝胶 网络含有疏水和亲水组分。 优选地,疏水性聚合物通过将通过将聚(乳酸)的末端羧酸基团的羟基与氨基乙醇基团的羟基与不饱和基团引入化合物(其是丙烯酰氯或具有不饱和基团的异氰酸酯) 分子的一端。 优选地,亲水性聚合物是葡聚糖,其中葡聚糖的葡萄糖单元中的一个或多个羟基与不饱和基团引入化合物反应,该化合物是分子的一端具有不饱和基团的丙烯酰氯或异氰酸酯。 药剂可以被包埋在聚合物网络中,例如药物,水溶性大分子或合成或天然聚合物,用于从其中控释。