Biodegradable material consisting essentially of or based on thermoplastic starch

摘要

For converting native starch or starch derivatives into thermoplastic starch, it is proposed that the starch, which is principally responsible for the conversion, be mixed with at least one hydrophobic, biodegradable polymer. This hydrophobic, biodegradable polymer which serves as a plasticising or swelling agent, can be a polymer from the following list: an aliphatic polyester, a copolyester with aliphatic and aromatic blocks, a polyester amide, a polyester urethane, a polyethylene oxide-polymer or a polyglycol and/or mixtures thereof. During the melting process, when mixing the starch, such as native starch in particular or derivatives thereof, with the hydrophobic, biodegradable polymer as a plasticising or swelling agent, to homogenise the mixture, the water content is to be reduced to 1 wt. % in relation to the weight of the mixture.