Modifizierte Staerken. Teilvorhaben 3: Hochsubstituierte carboxylgruppenhaltige Staerkederivate Abschlussbericht

A novel process has been developed, that enable the production of carboxymethylated starches (CMS) with substitution degrees up to 1.5 and yields of more than 70 percent. Different starches have been used, including native and waxy potatoe starches, corn and wheat starches and high amylose. The novel patented carboxymethylation method is based on a heterogeneous process using free monochloro-acetic acid as the etherification agent, and appropriate election of the reaction conditions such as water concentration, molar relations of the reagents, reaction time, and reaction temperature, prevent the common lumping of the reaction mixtures. With the obtained CMSs clear aqueous solutions are formed, that exhibit a broad viscosity range, high gel content, sufficient pH stability, and viscoelastic behavior. They may be used as viscosity modifiers, thickening agents, and co-builders in detergents.SIGLEAvailable from TIB Hannover: F03B261 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Ernaehrung, Landwirtschaft und Forsten, Berlin (Germany); Fachagentur Nachwachsende Rohstoffe e.V., Guelzow (Germany)DEGerman