| abstract |
A lignin based modifier is described that may be added to formaldehyde based binder systems such as phenol formaldehyde (PF), urea-formaldehyde (UF), melamine formaldehyde (MF), resorcinol formaldehyde (RF) and/or tannin formaldehyde resins. The lignin based modifier may be included in such binder systems used in the manufacture of composite panel boards such as plywood, hard board, medium density fibreboard (MDF) or particle boards in general. The lignin based modifier may used to improve the performance of the binder system, the performance of the resultant composite panel board and reduce the formaldehyde emissions of the board. The lignin modifier may contain: an acid, a gum rosin, a lignin and either a phenol or a polyethylene glycol. The lignin may be derived from lignocellulose powder. |