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US Patent 7976668 Method for producing wood-base materials

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Patent
Patent
1

Patent attributes

Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
1
Patent Number
79766681
Patent Inventor Names
Holger Militz1
Arend Jouke Kingma1
Falko Wepner1
Franz Weingart1
Andreas Krause1
Date of Patent
July 12, 2011
1
Patent Application Number
118172841
Date Filed
March 3, 2006
1
Patent Primary Examiner
‌
Philip C. Tucker
1
Patent abstract

The present invention relates to a process for the production of wood-base materials which have at least one thin veneer layer adhesively bonded over the surface to a substrate or to further veneer layers, which process comprises the following steps:i. impregnation of a veneer with an aqueous curable composition which comprisesa) at least one curable urea compound selected from urea compounds H which have at least one N-bonded group of the formula CH2OR, where R is hydrogen or C1-C4-alkyl, and/or a 1,2-bishydroxyethane-1,2-diyl group bridging the two nitrogen atoms of the urea, precondensates of the urea compound H, and reaction products or mixtures of the urea compound H with at least one alcohol which is selected from C1-C6-alkanols, C2-C6-polyols and oligoethylene glycols, andb) at least one catalyst K effecting crosslinking of the urea compound;ii) gluing of the impregnated veneer and/or the substrate with a glue composition andiii) processing of the glued veneer to give a wood-base material at elevated temperature with curing of the crosslinkable urea compound,the impregnated veneer comprising the crosslinkable urea compound in substantially uncrosslinked form before the gluing in step ii).

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