Water-resistant starch materials for the production of cast sheets and thermoplastic materials
AssigneeEMS-Inventa AG
InventorsRainer Frische, Renate Gross-Lannert, Klaus Wollmann, Bernd Best, Eduard Schmid, Fritz Buehler
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Abstract
The present invention relates to water-resistant, thermoplastic starch materials processable into environmentally safe, thermoplastically produced products and cast sheets, which consist of starch acyl compounds, obtainable from high amylose starches and the derivatives thereof and being sparingly soluble in water, and of plasticizers which like ethyl citrate, glycerol acetate and lactic acid ester have a gelatinizing effect and preferably a dissolution property resulting in brilliant transparence and, as can be proved, are biodegradable.
Claims14
A process for the production of water-resistant, thermoplastic starch material processable into environmentally safe, thermoplastically produced products and cast sheets, said process comprising simultaneously or successively reacting an acylation agent which is a free acid or chloride or anhydride of at least one fatty acid with high amylose starch having an amylose content of greater than or equal to 70% in a one-pot reaction without isolation of the intermediate products and then precipitating the resulting acyl modified starch from the reaction product by adding methanol, wherein the resulting acyl modified starch has a degree of substitution of at least 1.86.
A process for the production of water-resistant, thermoplastic starch material processable into environmentally safe, thermoplastically produced products and cast sheets, said process comprising reacting an acylation agent which is a free acid or chloride or anhydride of at least one fatty acid with high amylose starch having an amylose content of greater than or equal to 70% in a one-pot reaction without isolation of the intermediate products and then precipitating the resulting acyl modified starch from the reaction product by adding methanol, wherein the resulting acyl modified starch has a degree of substitution of at least 1.86.
Dependencies are inferred from the claim text.