Oxygen-tight plastic, and packaging material produced therefrom
OwnerNorbert Kuhl, Martin Wassmerinventors
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Abstract
The invention relates to a polymer blend comprising 15 to 70 Wt. % of polyvinyl alcohol (PVOH) and/or of a PVOH copolymer as well as 30 to 85 Wt. % of a further polymer, to a method for preparing a polymer blend, to the use of a polymer blend for producing a packaging material and to a packaging material. The packaging material obtained from the polymer blend is characterized in particular by a low gas permeability and can be produced by means of cost-effective methods.
Claims15
A thermoplastic polymer blend for producing a packaging material that is compostable in accordance with EN 13432 and/or EN 14995, wherein the thermoplastic polymer blend consists essentially of two plastics, of which the first plastic is a thermoplastic polyvinyl alcohol (PVOH) and the second plastic is a biodegradable, thermoplastic bioplastic that is a compostable plastic in accordance with EN 13432 and/or EN 14995 selected from the group consisting of thermoplastic material produced from glucose, thermoplastic material produced from cellulose, and thermoplastic material produced from lignin, wherein the mass-related mixing ratio of the thermoplastics lies in the range from 15 to 70% w/w polyvinyl alcohol (PVOH) and 30 to 85% w/w of the second thermoplastic, and wherein a packaging material produced at least to some extent from the thermoplastic polymer blend has an oxygen permeability from 0.1 to 1×10−4 cm3/cm2/day/0.21 bar, measured according to ISO 15105-2.
Dependencies are inferred from the claim text.