Biodegradable and waterproof shaped articles based on thermoplastic starch with lower retrogradation and improved mechanical properties
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United States of America Patent
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Dec 6, 2022
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Jun 6, 2022
filing date -
Jun 6, 2022
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Abstract
The invention relates to a method for producing a biodegradable thermoplastic starch-based article intended to come into contact with foodstuffs. In this method, the semi-crystalline starch granules are transformed into a homogeneous and almost amorphous material, called thermoplastic starch, by the addition of plasticizers at high temperatures and under shear. Thermoplastic starch is modified with organic acid during melt processing to prevent the retrogradation of starch. Moreover, cellulose derivatives are used as the reinforcement filler of thermoplastic starch. The article is produced using hot-pressing and then coating by immersion in a waterproofing solution.
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