The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 16, 1990
Filed:
Sep. 30, 1988
Christof Schmidt-Hellerau, Ludwigshafen, DE;
Johann Mayer, Freinsheim, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
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.