Functionalized polyorganosiloxanes or silanes for the treatment of lignocellulosic materials

A method for treating lignocellulosic materials to protect them against microorganisms, insects and fungi, comprising applying a polyorganosiloxane to said lignocellulosic materials by a procedure selected from the group of surface treatment, immersion treatment, or vacuum or pressure impregnation to form a coated- or impregnated-lignocellulosic material wherein said polyorganosiloxane is selected from polyorganosiloxanes of the formula:

• wherein n is in number average 0 to 28, wherein the radicals R1 represent organic radicals, which may be the same or different, with the proviso that at least one of the radicals R1 is a radical RF
• wherein
• RF is selected from the group of functional groups consisting of:
• (i) aldehyde groups,
• (ii) zwitterionic groups containing radicals selected from:
• or its neutral form:
• wherein
• R2 represents hydrogen, a monovalent straight-chained, cyclic or branched, saturated, unsaturated or aromatic hydrocarbon radical having up to 60 carbon atoms, which may contain one or more groups selected from —O—, —S—, —NH—, —C(O)— and —C(S)—,
• and wherein R2 may optionally be substituted by one or more substituents selected from the group consisting of a hydroxyl group, an optionally substituted heterocyclic group, optionally containing one or more nitrogen atoms, amino, alkylamino, dialkylamino, ammonium, polyether radicals and polyether ester radicals, wherein in case that multiple groups —N R2 are present, these may be the same or different, and
• R3 are the same or different and R3 is a divalent, straight-chained, branched, cyclic, aliphatic, unsaturated, or aromatic hydrocarbon radical having up to 30 carbon atoms, which may contain one or more groups selected from —O—, —NR4—, wherein R4 is hydrogen or C1-22-alkyl, —C(O)— and —C(S)—, and which may optionally be substituted by hydroxy and is bonded to the silicon atom via carbon,
• and
• (iii) zwitterionic groups containing radicals selected from:
• or its neutral form:
• wherein R2 and R3 are the same or different and are as defined above,
• and optionally a functional group selected from the group consisting of:
• phosphonium group,
• phosphine group,
• carbonate group,
• urethane group,
• isocyanate group including blocked isocyanate group,
• urea group,
• amido group,
• hemiacetal and acetal group,
• enamine group,
• imine group,
• sulfonic acid/sulfonate group,
• sulfuric acid half-ester/sulphate group,
• phosphoric ester/phosphate group
• phosphonic ester/phosphonate group,
• phosphorous ester/phosphite group,
• xanthate/xanthogenate ester group,
• organo amino group Si-bonded via N,
• hydroxy group,
• acyloxy group Si-bonded via O,
• alkoxy group Si-bonded via O, and
• thiosulfato group
• and salts thereof.