Light wood-based materials
A light wood-containing material having an average density in the range from 200 to 600 kg/m 3 , comprising, based in each case on the wood-containing material: A) from 30 to 95% by weight of wood particles; B) from 1 to 25% by weight of a filler having a bulk density in the range from 10 to 150 kg/m 3 , selected from the group consisting of foamable plastic particles and already foamed plastic particles; C) from 0.1 to 50% by weight of a binder and, if appropriate, D) additives, the following relationship being true for the d′ values according to Rosin-Rammler-Sperling-Bennet of the wood particles A) and of the particles of the filler B): d′ of the particles A) ≦2.5×d′ of the particles B).
1. A light wood-containing material having an average density in the range from 200 to 600 kg/m 3 , comprising a composition made from, based in each case on the wood-containing material:
A) from 30 to 95% by weight of wood particles;
B) from 1 to 25% by weight of a filler having a bulk density in the range from 10 to 150 kg/m 3 , selected from the group consisting of foamable plastic particles and already foamed plastic particles;
C) from 0.1 to 50% by weight of a binder and, optionally,
D) additives,
wherein the following relationship is true for the d′ values according to Rosin-Rammler-Sperling-Bennet of the wood particles A) and of the particles of the filler B):
d′ of the particles A) ≦2.5×d′ of the particles B).
2. The light wood-containing material according to claim 1 , wherein the component B) is selected from the group consisting of styrene homopolymer, styrene copolymer, C 2 - to C 10 -olefin homopolymer, copolymers of C 2 - to C 10 -olefins, PVC (rigid and flexible), polycarbonate, polyisocyanurate, polycarbodiimide, polyacrylimide, polymethacrylimide, polyamide, polyester, polyurethane, aminoplast resin and phenol resin.
3. The light wood-containing material according to claim 1 , wherein the component B) being selected from the group consisting of styrene homopolymer and styrene copolymer.
4. The light wood-containing material according to claim 1 , wherein the component C) is an aminoplast resin selected from the group consisting of urea-formaldehyde resin, melamine-formaldehyde resin, melamine-urea-formaldehyde resin.
5. The light wood-containing material according to claim 1 , wherein the content of the aminoplast resin in the component C), based on the light wood-containing material, being in the range from 1 to 45% by weight.
6. The light wood-containing material according to claim 1 , having an average density in the range from 300 kg/m 3 to 500 kg/m 3 .
7. The light wood-containing material according to claim 1 , having a transverse tensile strength in the range from 0.1 N/mm 2 to 1.0 N/mm 2 wherein the tensile strength is determined according to DIN EN 319.
8. A multilayer wood-base material which comprises at least three layers, only the middle layer or at least part of the middle layers comprising the light wood-containing material according to claim 1 .
9. A multilayer wood-base material which comprises at least three layers, only the middle layer or at least part of the middle layers comprising the light wood-containing material according to claim 1 and the outer covering layers comprising no filler.
10. An article which comprises the light wood-containing material as claimed in claim 1 .