Binder composition comprising amino acid polymer(s) as well as carbohydrates for composite articles

Use of a binder composition comprising

• a) Component A comprising amino acid polymer(s) A1 and
• b) Component B comprising component B1 selected from the group consisting of pentoses, hexoses, and disaccharides of pentoses and/or hexoses and mixtures thereof,
• wherein the amino acid polymer(s) A1 has(have) a total weight average molecular weight Mw,total of at least 800 g/mol and at most 10,000 g/mol and wherein the binder composition comprises at least 55 wt.-% amino acid polymer(s) A1 based on the total weight of the amino acid polymer(s) A1 and component B1,
• for producing a multi-layer particle board comprising a core layer and at least one surface layer, wherein the surface layer comprises said binder composition, and the core layer comprises a binder selected from the group consisting of urea/formaldehyde binder, phenol/formaldehyde binder, melamine/urea/formaldehyde binder, PMDI binder and mixtures thereof.