Patent ID: 6624284
Filing Date: 2003-09-23
Classification: B27N,C08G,C08L,Y10T

Abstract:
A process for producing a fiberboard panel byI. gluing cellulosic fibers with an aqueous glue solution comprising a) for a glue solution (a), an aliphatic polyamine having at least 3 groups selected from the group consisting of primary and secondary amino groups, having a weight average molar weight of from 600 to 1000000 g/mol, and being substantially free from other functional groups apart from tertiary amino groups (polyamine P); or b) for a glue solution (b), a mixture of a polyamine P and an amino resin (b) synthesized from b1) formaldehyde; b2) a compound (b2) selected from the group consisting of urea and melamine, the ratio of the amino groups of compound (b2) to formaldehyde being from 0.4:1 to 3:1; b3) and, if desired, up to 0.2 mol per mole formaldehyde of another compound, (b3), capable of reacting with formaldehyde in a polycondensation reaction; b4) and, if desired, up to 0.2 mol per mole amino groups of compound (b2) of another compound, (b4), capable of reacting with amino groups in a polycondensation reaction; or c) for a glue solution (c), an amino resin (c) synthesized from c1) formaldehyde; c2) a compound (c2) selected from the group consisting of urea and melamine, the ratio of the amino groups of compound (c2) to formaldehyde being from 0.3:1 to 3.0:1; c3) a polyamine P, the molar ratio of the sum of primary, secondary, and tertiary amino groups of polyamine P to the sum of primary amino groups of compound (c2) being from 0.0005:1 to 2:1; c4) and, if desired, up to 0.2 mol per mole formaldehyde of another compound, (c4), capable of reacting with formaldehyde in a polycondensation reaction; c5) and, if desired, up to 0.2 mol per mole amino groups of compound (c2) of another compound, (c5), capable of reacting with amino groups in a polycondensation reaction; and adjusting the moisture content of the cellulosic fibers and/or the water content of the glue such that the moisture content of the resinated cellulosic fibers is not more than 150%; andII. compressing the glued cellulosic fibers produced in step (I) at elevated temperature to a fiberboard panel.