Basf Se Corporation

Matthias Schade

Günter Scherr

Ingolf Hennig

Stephan Weinkötz

Jens Assmann

Stephan Weinkoetz

Detlef Krug

Marco Mäbert

Marco Maebert

The invention relates to a method for producing multi-layered lignocellulose materials having a core and an upper and a lower cover layer, said method comprising the following steps a) mixing the components, b) spreading the mixtures in layers, c) pre-compressing, d) applying a high-frequency electric field e) hot pressing. According to the invention, a mixture of C) 1-15 wt.-% of a binding agent selected from the group consisting of aminoplastic resin and organic isocyanate having at least two isocyanate groups [components C)], F) 0.1-3% alkali-/akaline earth salts, for the cover layers of the lignocellulose particles G) with H) 1-15% of a binding agent selected from the group consisting of aminoplastic resin and an organic isocyanate is mixed. After step a) the mixture for the core contains, with respect to the total dry weight of the mixture of the components A)-F) 3-15% water, the mixture for the cover layers of the components G)-K) contains 5-20% water, and the following conditions are met: F)&#x2265;1,1&#x2022;components K) and [components F)+components D)]&#x2265;1,1&#x2022;[components K)+components I)].

Method for producing multi-layered lignocellulose materials having a core with special properties and at least one upper and one lower cover layer

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Limburgerhof, Germany

Matthias Schade