Binder composition comprising polyamine(s) as well as 1,3-dihydroxyacetone, glycolaldehyde and/or glyceraldehyde for composite articles

A binder composition comprising

• a) component A comprising polymer(s) A1 having primary and/or secondary amino groups wherein polymer A1 has (have) a NCps of at least 1 wt.-%, wherein the polymer(s) A1 comprise(s) polymerization product of
• i) amino acids, and/or
• ii) amines comprising at least two amino groups, wherein the amines are no amino acids, and amino acids, and/or
• iii) amines comprising at least two amino groups, wherein the amines are no amino acids, and di and/or tricarboxylic acids, and optionally amino acids and/or
• iv) at least two compounds defined in i) to iii),
• and
• b) component B comprising component B1 which is 1,3-dihydroxyacetone,
• glycolaldehyde, glyceraldehyde or any mixture thereof, wherein polymer A1 has (have) a total weight average molecular weight Mw,total of at least 800 g/mol,
• wherein the number ratio of the sum of the numbers of primary and secondary amine groups of Component A1 to sum of the numbers of aldehyde and keto groups of component B1 is from 10:1 to 0.3:1.