Binder composition, in particular for wooden composite boards obtainable from - at least one polymer adhesive, - at least one tetravalent, pentavalent or hexavalent alditol or a higher valent alcohol with more than six hydroxyl groups as a polyalcohol compound, - at least one compound of the general formula R a SiX (4-a), or the general formula O b X c d R e SiO(4-b-c-d-e)/2, wherein - X is H, OH or a hydrolysable moiety selected from the group comprising halogen, alkoxy, carboxyl, amino, monoalkylamino or dialkylamino, aryloxy, acyloxy, alkylcarbonyl, - R is a non-hydrolysable organic moiety R selected from the group comprising substituted and unsubstituted akyl, substituted and unsubstituted aryl, substituted and unsubstituted alkenyl, substituted and unsubstituted alkinyl, substituted and unsubstituted cycloalkyl, which may be interrupted by -O- or - NH-, and - wherein R has at least one functional group Q selected from a group comprising an epoxide, hydroxyl, ether, amino, monoalkylamino, dialkylamino, substituted and unsubstituted aniline, amide, carboxyl, alkinyl, acryl, acryloxy, methacryl, methacryloxy, mercapto, cyano, alkoxy, isocyanate, aldehyde, alkylcarbonyl, acid anhydride and/or phosphoric acid group, and - R and X can be in each case the same or different from each other, and - a = 0, 1, 2, 3, in particular 0 or 1, - b, c, d = 0 or 1, and - e = 1, 2, 3. - at least one polymer adhesive, - at least one tetravalent, pentavalent or hexavalent alditol or a higher valent alcohol with more than six hydroxyl groups as a polyalcohol compound, - at least one compound of the general formula R a SiX (4-a), or the general formula O b X c d R e SiO(4-b-c-d-e)/2, wherein - X is H, OH or a hydrolysable moiety selected from the group comprising halogen, alkoxy, carboxyl, amino, monoalkylamino or dialkylamino, aryloxy, acyloxy, alkylcarbonyl, - R is a non-hydrolysable organic moiety R selected from the group comprising substituted and unsubstituted akyl, substituted and unsubstituted aryl, substituted and unsubstituted alkenyl, substituted and unsubstituted alkinyl, substituted and unsubstituted cycloalkyl, which may be interrupted by -O- or - NH-, and - wherein R has at least one functional group Q selected from a group comprising an epoxide, hydroxyl, ether, amino, monoalkylamino, dialkylamino, substituted and unsubstituted aniline, amide, carboxyl, alkinyl, acryl, acryloxy, methacryl, methacryloxy, mercapto, cyano, alkoxy, isocyanate, aldehyde, alkylcarbonyl, acid anhydride and/or phosphoric acid group, and - R and X can be in each case the same or different from each other, and - a = 0, 1, 2, 3, in particular 0 or 1, - b, c, d = 0 or 1, and - e = 1, 2, 3. - X is H, OH or a hydrolysable moiety selected from the group comprising halogen, alkoxy, carboxyl, amino, monoalkylamino or dialkylamino, aryloxy, acyloxy, alkylcarbonyl, - R is a non-hydrolysable organic moiety R selected from the group comprising substituted and unsubstituted akyl, substituted and unsubstituted aryl, substituted and unsubstituted alkenyl, substituted and unsubstituted alkinyl, substituted and unsubstituted cycloalkyl, which may be interrupted by -O- or - NH-, and - wherein R has at least one functional group Q selected from a group comprising an epoxide, hydroxyl, ether, amino, monoalkylamino, dialkylamino, substituted and unsubstituted aniline, amide, carboxyl, alkinyl, acryl, acryloxy, methacryl, methacryloxy, mercapto, cyano, alkoxy, isocyanate, aldehyde, alkylcarbonyl, acid anhydride and/or phosphoric acid group, and - R and X can be in each case the same or different from each other, and - a = 0, 1, 2, 3, in particular 0 or 1, - b, c, d = 0 or 1, and - e = 1, 2, 3.