Patent ID: 8187716

Claim:
An aqueous adhesion promoter composition which comprises at least one aminosilane of the formula (I) or at least one aminosiloxane AS obtained from a condensation reaction of an aminosilane of the formula (I) with at least one further silane at least one mercaptosilane of the formula (II); and either which has an alkylsilanes content of 0% to 45% by weight based on the weight of the aminosilane or aminosiloxane AS, or in which the ratio of the number of moles of alkylsilanes to the number of moles of aminosilane or aminosiloxane AS amounts to a value of 0-0.60 where R 1 is an n-valent organic radical having at least one primary and/or secondary amino group, R 1′ is an m-valent organic radical having at least one mercapto group, R 2 and R 2′ each independently are H or an alkyl group having 1 to 4 C atoms or are an acyl group; R 3 and R 3′ each independently are H or are an alkyl group having 1 to 10 C atoms; a and b each independently stand for a value of 0, 1 or 2; and n and m each independently stand for the values 1, 2, 3, and 4.