Aminoplast adhesive resin powder for wood-based materials or as a paper adhesive, which eliminates little formaldehyde, its preparation, and a formulated aminoplast adhesive resin powder

Abstract

In a proposed aminoplast adhesive resin powder for wood-based materials, which eliminates little formaldehyde, the resin is a mixture of (a) from 40 to 75 parts by weight of a urea/formaldehyde resin having a molar ratio of urea to formaldehyde of from 1:1.4 to 1:2, (b) from 10 to 20 parts by weight of a melamine/formaldehyde resin having a molar ratio of melamine to formaldehyde of from 1:1.3 to 1:3, (c) from 15 to 25 parts by weight of milled urea and (d) from 0.3 to 5 parts by weight of a flow improver, as well as up to 10 parts by weight of water and, if required, up to 10 parts by weight of other additives, the number of parts by weight of the components summing to 100.

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