Preparation of woodworking materials

Details Preparation of woodworking materials Preparation of woodworking materials

B - Operations, Transporting

27

N

18/952

B27N 3/00 (2006.01) B27N 1/00 (2006.01) C08K 9/00 (2006.01) C08L 61/20 (2006.01) C08L 97/02 (2006.01)

Patent

CA 1295801

Abstract of the Disclosure: Woodworking materials having a lower subsequent formaldehyde emission can be prepared in an advantageous manner and with good resin reactivity and good strengths and swelling properties by mixing lignocellulose-containing particles, for example wood particles, with a curable binder based on curable amino- plast condensates and then pressing the mixture under the action of heat, a mixture A containing a water-compatible agent for binding formaldehyde being applied to or mixed with the particles before the latter are mixed with the curable binder, if the mixture A is an aqueous solution which has a pH of from 3.0 to 6.5 and contains a) organic acids which attack wood only insignificantLy, if at all, in an amount of more than 15% by weight, based on the solids content of the solution, prefer- ably a mixture of aliphatic carboxylic acids of 4 to 10 carbon atoms, and b) a formaldehyde-binding, nitrogen-containing compound, in particular urèa.

578800

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