THERMOPLASTIC STARCH
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United States of America Patent
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Issued Date -
Nov 10, 2022
app pub date -
Jul 10, 2020
filing date -
Jul 11, 2019
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Abstract
Described is a method for producing a thermoplastic starch, wherein a mixture is extruded comprising starch and a polyol, preferably selected from the group comprising polyethylene glycol, monosaccharides, sugar alcohols and mixtures thereof, in a quantity of 0 to 9.9 wt. % of the mixture, and an epoxide, selected from the group comprising epoxidised vegetable oils, and mixtures thereof, in a quantity of 0.1 to 6 wt. % of the mixture, the mixture further containing an acid, preferably a carboxylic acid selected from the group consisting of citric acid, malic acid or tartaric acid, in a quantity of 0.1 to 1 wt. % of the mixture, and being devoid of polyester urethane. The invention also describes a thermoplastic starch produced in this way, a compound produced with the aid of the thermoplastic starch, and a film produced from such a compound or an injection-moulded item produced from such a compound.
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