Binder composition comprising poly(amino acid)s for fiber composite articles

Use of a binder composition comprising

• component A comprising polymer(s) A1 and
• optionally component B comprising component B1 which is selected from the group consisting of monosaccharides, 5 disaccharides, hydroxyacetone, glycolaldehyde and mixtures thereof,
• wherein polymer(s) A1 consist(s) of polylysine(s) and has(have) a total weight average molecular weight Mw, total of 800 g/mol to 10,000 g/mol,
• wherein the binder composition comprises 80 to 100 wt.-% polymer(s) A1, and 0 to 20 wt.-% component B1, based on the total weight of the sum of polymer(s) A1 and component B1, wherein the weight amounts of the polymer(s) A1 and component B1 are selected such that the total weight of the sum of polymer(s) A1 and component B1 is 100 wt.-%,
• for the preparation of a lignocellulosic fiber board, wherein 3 to 15 wt-% polymer(s) A1 and component B1 in total based on the total oven-dry weight of the lignocellulosic fibers are used for the preparation of the lignocellulosic composite article.