STARCH-BASED MATERIALS AND/OR MOULDED PARTS MODIFIED BY SYNTHETIC POLYMER COMPOUNDS AND PROCESS FOR PRODUCING THE SAME

摘要

Materials and / or starch-based moldings thermomechanically hydrolyzed under pressure and at elevated temperatures with the addition of water and / or low molecular weight plasticizers, contain synthetic thermoplastic polymeric compounds intimately mixed with the starch. These materials and / or molded articles are characterized in that the synthetic thermoplastic polymer compounds contained therein are aqueous polymer dispersions derivatives which have a polymer phase dispersed in an aqueous phase and which have been mixed with the aqueous phase to 'starch. The dissolution of the starch is carried out using the aqueous polymer dispersions. Preferably, these materials and / or the molded parts are produced by a process in which the dissolution of the starch, which converts it into a thermoplastic material, is carried out simultaneously with the homogeneous mixture of aqueous polymer dispersions with the starch, in a single step. According to such a process for producing materials or moldings thus modified with polymers, is mixed preferably native starch with the aqueous polymer dispersions and optionally with other plasticizers with low molecular weight, this mixture is subjected to various substances in a process for dissolution of the starch under pressure and at elevated temperatures, at the same time that the mixture is intensively mixed and / or kneaded until formation of thermoplastically processable starch and the polymer mixture homogenized is optionally shaped.