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
Water-resistant, thermoplastic starch materials which are processable into environmentally safe, thermoplastically produced products and cast sheets. They consist of starch acyl compounds, obtainable from high amylose starches and their derivatives (being sparingly soluble in water), and of plasticizers (like citric acid ethyl ester, glycerol acetate and lactic acid ester), which have a gelatinizing effect, and preferably, a dissolution property resulting in brilliant transparence and, as can be proved, are biodegradable.
Claims11
A water-resistant, thermoplastic starch material processable into environmentally safe, thermoplastically produced products and cast sheets, comprising (a) at least one acyl modified starch or derivative thereof, said acyl modified starch having a degree of substitution of at least 1.86, is sparingly soluble in water and is prepared from the reaction of (i) high amylose starch having an amylose content of greater than or equal to 70% and (ii) an acylation agent which is a free acid or chloride or anhydride of at least one fatty acid, and (b) at least one biodegradable plasticizer.
Dependencies are inferred from the claim text.