Biodegradable thermoplastic compositions comprising a starch component, a cellulose ester or ether, a plasticizer for the starchy phase and of the cellulose and derivatives, and a compatibilizer agent selected from polymers compatible with the cellulose and or starchy component, grafted with aliphatic or polyhydroxilated chains; copolymers obtained from hydroxy acids and/or diamines with 2-24C and aliphatic or aromatic diisocyanates; copolymers obtained from aliphatic polyesters, polyureas and polyalkylene glycols and aliphatic or aromatic diisocyanates; copolymers obtained from polymers compatible with cellulose ester or ethers and/or the starchy component by grafting starch soluble polyols; polymer capable of complexing starch; starch compatible polyols.

As composições thermoplastic biodegradable que compreendem um componente do starch, um ester ou um ether de celulose, um plasticizer para a fase starchy e da celulose e dos derivatives, e um agente do compatibilizer selecionado dos polímeros compatíveis com a celulose e ou o componente starchy, grafted com aliphatic ou polyhydroxilated correntes; copolymers obtidos dos ácidos e/ou dos diamines hydroxy com 2-24C e diisocyanates aliphatic ou aromatic; copolymers obtidos dos poliésteres aliphatic, os polyureas e os glicóis do polyalkylene e diisocyanates aliphatic ou aromatic; copolymers obtidos dos polímeros compatíveis com ester ou ethers de celulose e/ou o componente starchy grafting polyols do soluble do starch; polímero capaz de starch complexing; polyols compatíveis do starch.