The invention relates to a primer for improving the adhesion of
adhesive tapes to hydrophilic surfaces, such as, in particular, glass or
ceramic. The primer according to the invention comprises, dissolved or dispersed in one or more solvents, a mixture G ofat least one
copolymer obtained by copolymerization of a
monomer mixture comprising to at least 90 wt. % the following monomers:vinylcaprolactam and / or vinylpyrrolidone and one or more of the monomers a) and b):c)
acrylic acid ester of a linear,
primary alcohol having 2 to 10 carbon atoms in the
alkyl radical of the
alcohol,d)
acrylic acid ester of a branched, non-
cyclic alcohol having 3 to 12 carbon atoms in the
alkyl radical of the
alcohol,at least one organofunctional
silane of the general structure (Ia) or (Ib)(R1O—)xSi(CH2OR2)y(R3)z (Ia)(R1O—)xSi(CH2NHR2)y(R3)z (Ib), whereinthe radicals R1 independently of each other represent a C1-C4-
alkyl radical, a C2-C6-alkoxyalkyl radical or an acetyl radical;the radicals R2 independently of each other represent an organic radical;the radicals R3 independently of each other represent a C1-C18-alkyl radical andx=1, 2 or 3; y=1, 2 or 3; x+y≦4 and z=4−x−y;at least one
metal compound selected from the group consisting of
metal acetylacetonates,
metal alkoxides and alkoxy-metal acetylacetonates,at least one amine.