Oriented strand boards

Details Oriented strand boards Oriented strand boards

C - Chemistry, Metallurgy

09

D

C09D 161/28 (2006.01) B29D 99/00 (2010.01) B32B 5/26 (2006.01) C08L 97/02 (2006.01) C09D 161/30 (2006.01)

Patent

CA 2530615

Oriented strand board (OSB), comprising a core layer and two face layers, whereby the face layers comprise an adhesive composition, wherein the adhesive composition in at least one of the face layers comprises a resin composition comprising melamine, formaldehyde, optionally urea and aromatic hydroxyl compounds, wherein the molar ratio of melamine to formaldehyde is 1:0.8-4.0, the molar ratio of melamine to urea is 1:0-2.0 and the molar ratio of melamine to aromatic hydroxyl compounds is 1:0-2Ø In a preferred embodiment, both the face layers and the core layer comprise the said adhesive composition. The OSB's according to the invention can meet the OSB/3 and even the OSB/4 requirements in the EN 300 standards.

La présente invention concerne des panneaux de particules longues et orientées (OSB), qui comprennent une couche noyau et deux couches de surface, les couches de surface comprenant une composition adhésive, la composition adhésive d'une des couches de surface au moins comprenant une composition de résine renfermant de la mélamine, du formaldhéhyde, facultativement de l'urée et des composés hydroxyles aromatiques, le rapport molaire de la mélamine au formaldéhyde étant de 1:0,8-4,0, et le rapport molaire de la mélamine aux composés hydroxyles aromatiques étant de 1:0-2,0. Dans un mode de réalisation préféré, tant les couches de surface que la couche noyau renferment ladite composition adhésive. Le panneau OSB de l'invention satisfait aux exigences OSB/3, et même aux exigences OSB/4, des normes EN 300.

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