BARRIER LAYER FOR PACKAGING LAMINATE AND PACKAGING LAMINATE HAVING SAID BARRIER LAYER Russian patent published in 2013 - IPC C07H1/00 B32B27/10 B65D65/40 C08B37/14 

FIELD: chemistry.

SUBSTANCE: barrier layer is made from a hydrolysate on a cellulose base. Said layer contains lignin and oligo- or polysaccharides, where the lignin and oligo- or polysaccharides are at least partially covalently bonded to each other in a matrix and at least one auxiliary component. The auxiliary component is linked to the lignin and oligo- or polysaccharides through primary and/or second links. Said barrier layer has oxygen permeability of less than 50 cm³/m²/24 h with relative air humidity of 80%, 1 atm and thickness of less than 50 mcm. The method of making the barrier layer involves obtaining a hydrolysate on a cellulose base, which contains lignin and oligo- or polysaccharides that are partially covalently bonded to each other in a matrix, adding an auxiliary component, linking the auxiliary component with the lignin and oligo- or polysaccharides through primary and/or secondary links. The method includes a step of determining the amount of lignin and oligo- or polysaccharides and/or the number and type of functional groups per lignin and oligo- or polysaccharides in the obtained hydrolysate.

EFFECT: obtained barrier layer demonstrates good gas impermeability properties at high air humidity, thereby achieving suitable barrier properties in thin film or coating layers.

12 cl, 2 tbl, 2 dwg, 3 ex