C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/57, 154/107.
C08G 14/08 (2006.01) B27N 3/00 (2006.01) C08G 14/06 (2006.01) C08L 97/02 (2006.01) C09J 161/34 (2006.01)
Patent
CA 1317062
Abstract The invention relates to a resin for the production of cellulose based products, such as particle boards. The resin is a condensation product of formaldehyde, urea and phenol and optionally melamine with a molar ratio of 1.4- 0.8 moles of urea, 0.006 - 0.04 moles of phenol and 0- 0.04 moles of melamine per mole formaldehyde. The invention also relates to a method of producing such a resin. Accor- ding to the method a separately prepared cross-linking agent containing a co-condensate of phenol, formaldehyde and urea or containing a co-condensate of phenol and formaldehyde together with urea, is added to a pre-conden- sate of formaldehyde, urea and optionally melamine, where- after the mixture is condensed. As an alternative the cross-linking agent can be added to a finished condensate of formaldehyde, urea and optionally melamine. The invention also relates to a method of manufactur- ing glued cellulose based products.
557262
Flodman Leif Algot
Gabrielsson Per Erik Georg
Dynobel A/s
Swabey Ogilvy Renault
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