Preparation of woodworking materials

Details Preparation of woodworking materials Preparation of woodworking materials

1988-09-30

1990-10-16

Cashion, Jr., Merrell C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524 14, C08K 904, C08K 912, C08J 318, C08J 506

Patent

active

049635999

ABSTRACT:
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 aminoplast 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, preferably a mixture of aliphatic carboxylic acids of 4 to 10 carbon atoms, and
(b) a formaldehyde-binding, nitrogen-containing compound, in particular urea.

REFERENCES:
patent: 4431699 (1984-02-01), Hunsucker

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