Verfahren zur Beschichtung von Oberflaechen unter Verwendung von hybriden Polymermaterialien

Beschrieben wird ein Verfahren zur Beschichtung von Oberflaechen durch hybride Polymermaterialien sowie die dabei verwendeten Beschichtungsloesungen bzw. -massen.

EP 1310535 A UPAB: 20030820 NOVELTY - A novel coating composition is obtained by (A) hydrolytic condensation, optionally in presence of a condensation catalyst or additives, of (i) a crosslinkable epoxysilane (10-98 mol.%) with (ii) a complexed aluminum alkoxide (5-75 mol.%), followed by (B) addition of a pre-polymer or reactive diluent, each of which is optionally crosslinkable and the pre-polymer being able to form an interpenetrating network (IPN). DETAILED DESCRIPTION - A novel coating composition is obtained by (A) hydrolytic condensation, optionally in presence of a condensation catalyst or additives, of (i) a crosslinkable epoxysilane (10-98 mol.%) of formula (I) (or its oligomer) with (ii) a complexed aluminum alkoxide (5-75 mol.%) of formula (II), followed by (B) addition of pre-polymer or reactive diluent each of which is optionally crosslinkable and the pre-polymer being able to form an interpenetrating network (IPN). R'''mSiX(4-m) (I) Al(OR')3 (II) X = H, halogen, alkoxy, acyloxy, alkylcarbonyl, alkoxycarbonyl or -N(R'')2; R'' = H or alkyl; R''' = alkyl, alkenyl, alkynyl, aryl, aralkyl, alkaryl, aralkenyl, alkenylaryl, aralkynyl or alkynylaryl, each optionally interrupted by -O-, -S- or -N(R'')- and/or optionally substituted by halogen or optionally substituted amino, amide, aldehyde, keto, alkylcarbonyl, carboxy, mercapto, CN, OH, alkoxy, alkoxycarbonyl, sulfonic or phosphoric acid, (meth)acryloxy, epoxy or vinyl, with R''' or one of the substituents being an epoxy group; m = 1, 2 or 3; R' = alkyl or -(CH2)x-O-(CH2)y-CH3; x = an integer 1-6; and y = an integer 0-6 USE - As a hybrid polymer sol replacement for chromatizing layers applied especially to aluminum surfaces. ADVANTAGE - The coating fulfills all of the requirements for such layers, e.g. as regards ease of preparation without use of methanol, good storage stability and good adhesion to the substrate and also to primers and cover layers.