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    • 1. 发明授权
    • Carboxymethyl-etherified starch derivatives and process for preparing
the same
    • 羧甲基醚化淀粉衍生物及其制备方法
    • US5811541A
    • 1998-09-22
    • US799839
    • 1997-02-13
    • Sang Gi KwonYang Rae ChoChan Hun ParkChul Jong Ko
    • Sang Gi KwonYang Rae ChoChan Hun ParkChul Jong Ko
    • C08B31/08C08B31/10C08B31/12C08B31/00
    • C08B31/12
    • Novel carboxymethyl-etherified starch derivatives and methods for manufacturing the same, and more particularly, to the novel carboxymethyl-etherified starch derivatives having a viscosity in 5% aqueous solution of 15.about.600 cps, when measured by a viscometer of the Hakke rotary type; a permeability in 0.1% aqueous solution of more than 95% at 623 nm, when measured by a UV spectrophotometer; viscosity values at a maximum temperature of 95.degree. C. and at a temperature cooled to 50.degree. C. of 6.about.304 BU and 6.about.720 BU, respectively when measured by a Brabender viscometer. The cool water-soluble carboxymethyl-etherified starch derivatives are prepared by the following steps: starches (such as corn, potato, wheat and rice are dissolved in organic solvents, such as, lower alcohol without hydrolysis, or hydrolyzed in the presence of inorganic acids, such as, hydrochloric acid or sulfuric acid at 25.degree. to 75.degree. C. for 30 minutes to 72 hours. Then, with the addition of an etherifying agent, in the presence of alkali, some organic solvent of lower alcohol is further added to the mixture and reacted. The reactant was neutralized, purified with organic solvents and dried to give the desired product.
    • 新型羧甲基醚化淀粉衍生物及其制造方法,更具体地说,涉及当通过Hakke旋转型粘度计测定时,具有5%DEPFANCE 600cps的5%水溶液中的粘度的新型羧甲基醚化淀粉衍生物; 当通过紫外分光光度计测量时,在623nm处的0.1%水溶液中的渗透率大于95% 当由Brabender粘度计测量时,分别在95℃的最高温度和6℃下的粘度值分别为6分贝304和6差6倍。 冷水溶性羧甲基醚化淀粉衍生物通过以下步骤制备:将淀粉(例如玉米,马铃薯,小麦和稻米)溶解在有机溶剂如低级醇中而不水解,或在无机酸存在下水解 ,例如盐酸或硫酸,在25〜75℃下反应30分钟〜72小时,然后加入醚化剂,在碱的存在下,进一步加入一些低级醇的有机溶剂 混合物并反应,中和反应物,用有机溶剂纯化并干燥,得到所需产物。