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AssigneeBio-Tec Biologische Naturverpackungen GmbH
InventorsJurgen Loercks, Winfried Pommeranz, Harald Schmidt, Ralf Timmermann, Ernst Grigat, Wolfgang Schulz-Schlitte
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For converting native starch or starch derivatives into thermoplastic starch, added to the starch is at least one hydrophobic biodegradable polymer. This hydrophobic biodegradable polymer, which serves as a plasticizer or swelling agent, may be a polymer selected from the following list: an aliphatic polyester, a copolyester with aliphatic and aromatic blocks, a polyester amide, a polyester urethane, a polyethylene oxide polymer and/or a polyglycol, and/or mixtures of these. When the starch, such as in particular native starch or derivatives thereof, is mixed in the melt with the hydrophobic biodegradable polymer as a plasticizer or swelling agent, to homogenize the mixture, the water content is reduced to <1% by weight based on the weight of the mixture.
A polymeric mixture consisting essentially of thermoplastic starch containing, as a plasticizer responsible for converting at least one of native starch or a starch derivative into the thermoplastic starch, at least one hydrophobic biodegradable polymer selected from the group consisting of aliphatic polyesters, copolyesters having aliphatic and aromatic blocks, polyester amides, polyethylene oxide polymers, polyglycols, and mixtures thereof,
A method for manufacturing a polymeric mixture consisting essentially of thermoplastic starch, wherein at least one of native starch or a starch derivative is homogenized while in the form of a thermoplastic starch melt by means of a plasticizer and in a manner so that the water content prior to or during heating and mixing of the thermoplastic starch melt is reduced to less than 5% by weight based on the weight of the polymeric mixture prior to cooling of the melt, wherein the plasticizer is at least one hydrophobic biodegradable polymer selected from the group consisting of aliphatic polyesters, copolyesters having aliphatic and aromatic blocks, polyester amides, polyester urethanes, polyethylene oxide polymers, polyglycols, and mixture thereof.
Dependencies are inferred from the claim text.