Hydrophobe Staerkecarbamate und Verfahren zu ihrer Herstellung

DE 10129312 A UPAB: 20030731 NOVELTY - Optionally protected alkyl isocyanates are used in a method for the production of hydrophobic carbamates of starch, partly-degraded starch, dextran and/or dextrin by adding an isocyanate and a Lewis acid catalyst to a solution of native starch and/or starch products in an isocyanate-inert solvent or swelling agent at 60-160 deg. C. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (a) hydrophobic starch carbamates obtained by this method (operated as a discontinuous process in a horizontal or vertical kneader), with a degree of substitution (DS) of 0.5-3 and a contact angle to water of more than 100 deg. ; and (b) similar products with a DS of 0-2 and a contact angle of more than 95 deg. , obtained by continuous reaction in a twin screw extruder. USE - Hydrophobic starch carbamates obtained by this method are used for the production of biodegradable polymers (claimed). Applications include compatibilisers and coating materials. ADVANTAGE - Enables the production of hydrophobic starch carbamates with a wide range of possible components and reaction conditions and without using environmentally undesirable aromatic isocyanates