Process for the manufacture of biodegradable starch esters
OwnerRolf Kakuschke, Inno Rapthel +2inventors
InventorsROLF KAKUSCHKE, INNO RAPTHEL, HARTMUT STOYE, GUNTER SCHMOZ
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Abstract
The invention covers a process to manufacture biodegradable starch esters which can be processed into extrudates, formed parts and sheeting. The starch is activated with a carboxylic acid/carboxylic anhydride mixture through partial swelling and the onsetting esterification reaction at simultaneous conversion of the water entrained in the starch and partially esterified with a carboxylic anhydride up to the desired degree of substitution with progressing swelling and disintegration.
Claims9
A process to manufacture biodegradable starch esters, characterized in that the starch a) is activated through partial swelling and an onsetting esterification reaction at simultaneous conversion of the water entrained in the starch with a carboxylic acid/carboxylic acid anhydride mixture, b) is partially esterified with progressing swelling and destructuring with a carboxylic acid anhydride up to the desired degree of substitution.
Dependencies are inferred from the claim text.