Decomposable packing material
AssigneeBayer Aktiengesellschaft
InventorsRalf Dujardin, Rolf Dhein, Martin Wandel
Life of this patent
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Abstract
This invention relates to decomposable polyamide masses for packaging materials containing 5 to 25% by weight of an addition of linear, oligomeric aliphatic polyesters or polycarbonates with molecular weights from 800 to 4000. These additives preferably consist of polyesters of aliphatic diols and dicarboxylic acids having up to 10 carbon atoms or aliphatic carbonates having up to 10 carbon atoms. The use of such mixtures for easily degradable, decomposable polyamide packages is also claimed, in particular in the form of films or thin walled injection moulded parts for (food) packaging.
Claims16
A biologically degradable film for food packaging consisting essentially of a) an aliphatic polyamide comprising polycaprolactam, a polyamide based on aliphatic dicarboxylic acids and aliphatic diamines wherein each of said aliphatic dicarboxylic acids and aliphatic diamines has 4 to 5 carbon atoms, or copolymers of these two;
- and b) a linear or slightly branched oligomeric, aliphatic polyester with a molecular weight of from 800 to 4000 g/mol in quantities of from 5 to 25% by weight.
Biologically degradable thin walled injection moulded products for food packaging consisting essentially of a) an aliphatic polyamide comprising polycaprolactam, a polyamide based on aliphatic dicarboxylic acids and aliphatic diamines Wherein each of said aliphatic dicarboxylic acids and aliphatic diamines has 4 to 6 carbon atoms, or copolymers of these two;
- and b) a linear or slightly branched oligomeric, aliphatic polyester based on aliphatic diols and dicarboxylic acids each having up to 10 carbon atom, said polyester having a molecular weight of from 800 to 4000 g/mol.
A biologically degradable film for food packaging consisting essentially of a) aliphatic polyamides comprising polycaprolactam, polyamides based on aliphatic dicarboxylic acids and aliphatic diamines wherein each of said aliphatic dicarboxylic acids and aliphatic diamines has 4 to 6 carbon atoms, or copolymers of these two;
- and b) linear or slightly branched oligomeric, aliphatic polyesters with molecular weights of from 800 to 4000 g/mol, said polyesters being present in said film in a quantity of from 5 to 25% by weight.
Dependencies are inferred from the claim text.