Compositions for Fibreboards with Enhanced Properties Upon Fast-Curing at Low Temperature

A composition comprising a constituent-A, which constituent-A consists of:

• a polylysine component,
• a XL-component, and
• a fibrous component,
• wherein
• the polylysine component selected from the group consisting of polylysines-X and mixtures thereof, and wherein the polylysines-X are selected from the group consisting of hyperbranched polylysines and primary ammonium salt of hyperbranched polylysines, wherein each one of the polylysines-X has a degree of branching determined by 1H-NMR spectroscopy of at least 0.30 and at most 0.60, an apparent viscosity determined by the Rheometry Method of at least 400 and at most 8000 mPa·s, and a gel content determined by the Gel-Content Method of at most 4.0%;
• and
• the XL-component is selected from the group consisting of monomeric or polymeric compounds each of which has at least two XL-groups per molecule wherein the XL-groups are selected from the group consisting of groups according to the formula XL1, groups according to the formula XL2, groups according to the formula XL3, groups according to the formula XL4, groups according to the formula XL5, groups according to the formula XL6 and groups according to the formula XL7
• and
• the fibrous component consists of at least one fibrous element which fibrous element comprises vegetable fibers, and wherein the fibrous element is free of any fibers other than the vegetable fibers,
• and
• wherein
• the composition is free of any fibers other than the vegetable fibers of the fibrous component, and
• wherein
• the constituent-A is present in an amount of at least 10 and at most 100 wt % of the composition, and
• wherein
• the polylysine component is present in an amount of at least 1.0 and at most 20.0, wt % of the composition, and
• wherein
• weight ratio K defined as the weight amount of the XL-component divided by the weight amount of the polylysine component is at least 0.01 and at most 5.