Patent ID: 11884817
Assignee: PANARA, A.S.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 1:
2. The method for preparation of the biodegradable polymer blend of claim 1, wherein at the beginning of blending process, a dryblend is prepared by mixing at ambient temperature, wherein the dryblend consists of starch and at least one of the modifiers, and the dryblend optionally can contain one or more of the plasticizers for starch, and together with the dryblend, also a polymer from the group (A) can be added to the blend, wherein at least one substance from the group (C) is added to the blend at latest in that phase of the blending process which precedes by at least one phase the phase of the blending process in which component (D) is added to the blend, and at least one substance from the group (A) is added to the blend in that phase of the blending process which precedes at least one phase that phase of the blending process in which component (D) is added to the blend, wherein the order of dosing substances from the group (A) and (C) is discretionary, and one or multiple components (D) of the homopolymers or copolymers of polyhydroxyalkanoates (PHAs), and/or their mixtures are added to the blend in a such phase of the blending process, which follows by at least one phase of the blending process the phase in which are simultaneously blended: starch, at least one component (A), at least one substance from the group (C), and at least one substance from group (E); wherein components (F) and (G) can be added to the blend in any phase of the blending process; and before the output of a hot-melt from the last blending step, an amount of humidity of the blend is removed by atmospheric or vacuum degassing, and the produced blend in hot-melt form is:
(i) cooled by liquid or gas, preferably by water or air, and granulated
(ii) or lead to an extruder die for producing final products or intermediates.