Thermoplastic mixtures containing dialdehyde starch and natural polymers
AssigneeAventis Research & Technologies GmbH & Co. KG
InventorsHolger Bengs, Arnold Schneller, Gitte Böhm, Silke Schuth, Jürgen Grande
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Abstract
Homogeneous mixtures are described and can be processed to give shaped biodegradable and physiologically nonhazardous articles, such as packagings for food or drink or pharmaceutical products, sausage casings and the like. The mixtures comprise dialdehyde starch with a degree of oxidation of greater than 30%, starch which does not exhibit any iodine-starch reaction, and/or modified starch, water and other plasticizers, and also, if desired, other biopolymers and additives.
Claims15
A thermoplastic mixture based on starch for producing shaped biodegradable articles with improved mechanical properties, obtainable by preparing and mixing
- A) 100 parts by weight, calculated after correction to 0% water content, of any desired starch excluding dialdehyde starch which is native and/or chemically modified, fermentative, recombinant and/or prepared by biotransformation and/or of derivatives of the starches mentioned;
- B) from 1 to 100 parts by weight of dialdehyde starch which has a degree of oxidation of more than 30% and does not exhibit any iodine-starch reaction (blue coloration);
- C) an amount of from 1 to 100 parts by weight of water;
- D) an amount within the range from 2 parts by weight up to half of the total of the parts by weight of A) and B) of at least one plasticizer;
- E) if desired, other biopolymers, and
- F) if desired, up to (A) and (B)) parts by weight of other conventional additives;
- where the mixing of components A to F takes place with introduction of thermal and mechanical energy into the thermoplastic mixture.
Dependencies are inferred from the claim text.