Method for modifying wood and wood thereby obtained

A method for modifying wood comprising the steps of:

• a) impregnating said wood with a polymerizable composition comprising a compound of formula I and/or formula II
• wherein n is 0, 1, 2, 3, 4 or 5,
• wherein t and s each independently are 1 or 2,
• wherein w and z each independently are 0 or 1,
• wherein X and Y each independently are O, S or N—R21 and
• wherein R2, R3, R4, R5, R6, R7, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R21 are each independently hydrogen or selected from the group consisting of C1-C2 alkyl, carboxaldehyde, hydroxyalkyl, carboxyl, aminoalkyl, alkylaminoalkyl hydroxyalkylfurylalkyl, alkyloxy, alkoxyalkyl, alkylcarbonylalkenyl, alkylcarbonyloxyalkyl, alkyloxycarbonylalkenyl, alkenylcarbonyloxyalkyl, oxiranyl, isocyanate, isocyanate-alkyl, alkylcarboxy, alkenylcarboxy, alkylcarbonyl, alkenylcarbonyl, halocarbonyl, haloalkyl, haloaryl, haloalkenyl, imino, thioalkyl, alkylthioalkyl, cyano and any mixtures thereof,
• whereby each group is optionally substituted with one or more substituents selected from C1-C2 alkyl, C2-C4 alkenyl, C2-C4 alkynyl, hydroxyl, carboxyl, nitro, amino, alkylfuryl, hydroxyalkylfurylalkyl, isocyanate, formyl, halocarbonyl, and thiol,
• wherein R1, R8, R17 and R20 are each independently selected from the group consisting of carboxaldehyde, hydroxyalkyl, carboxyl, aminoalkyl, alkylaminoalkyl, hydroxyalkylfurylalkyl, alkyloxy, alkoxyalkyl, alkylcarbonylalkenyl, alkylcarbonyloxyalkyl, alkyloxycarbonylalkenyl, alkenylcarbonyloxyalkyl, oxiranyl, isocyanate, isocyanate-alkyl, alkylcarboxy, alkenylcarboxy, alkylcarbonyl, alkenylcarbonyl, halocarbonyl, haloalkyl, haloaryl, haloalkenyl, imino, thioalkyl, alkylthioalkyl, cyano and any mixtures thereof,
• whereby each group is optionally substituted with one or more substituents selected from C1-C2 alkyl, C2-C4 alkenyl, C2-C4 alkynyl, hydroxyl, carboxyl, nitro, amino, alkylfuryl, hydroxyalkylfurylalkyl, isocyanate, formyl, halocarbonyl, and thiol, and
• wherein the dotted line represents a double bond,
• wherein said compounds are diluted in water, and
• wherein said composition further comprises a catalyst which is an ammonium salt, an organic acid, an anhydride, an inorganic acid, magnesium chloride, magnesium sulfate, magnesium nitrate, zinc chloride, zinc nitrate, aluminum chloride, aluminum nitrate, aluminum sulfate or any mixtures thereof,
• and
• b) reacting said impregnated wood at a temperature of between 70 and 200° C.