Patent ID: 8128748

Claim:
An aqueous two-component adhesion promoter composition comprising two components, the first component, K 1 , comprising: at least one organoalkoxysilane S that is a reaction product of a compound containing at least one epoxy group with an aminosilane of the formula (Ill) or (IV): wherein R 1 is an alkyl group having 1 to 8 C atoms; R 2 is an alkyl group having 1 to 5 C atoms; R 3 is a linear or branched alkyl group having 1 to 4 C atoms; a is the value 0, 1 or 2; and at least one anhydrous surfactant T, wherein the weight total of organoalkoxysilane S and surfactant T is more than 90% by weight, based on the weight of component K 1 ; the second component, K 2 , comprising: water, and at least one acid; wherein the at least one acid is present in an amount such that after components K 1 and K 2 have been mixed the resulting mixture gives an acidic reaction, wherein the at least one acid is an organic acid which contains a sulphur atom or a phosphorus atom.