Process for producing a storage-stable activator for glass and ceramic substrates

Abstract

The invention relates to a process for preparing an adhesion-promoting pre-treatment composition, comprising the steps: a) providing a reaction vessel containing 100 parts by weight of an alcohol having 1 to 4 carbon atoms; b) adding at least one organosilane OS in an amount that between 0.15 and 0.8 parts by weight of silicon are added and optionally adding at least one organoitianate OT in an amount that between 0.01 and 0.8 parts by weight of titanium are added and optionally adding at least one organozirconate OZ in an amount that between 0.01 and 0.8 parts by weight of zirconium are added; c) adding an acid A in an amount that the resulting pH is between 3.5 and 7; d) adding water, wherein the amount of water added is at least equimolar to or in a molar excess to the molar amount of hydrolyzable silicon-, titanium-, and or zirconium-bound groups present in all added organosilane OS, organoitianate OT, and organozirconate OZ, wherein the amount of water is at most 25 parts per weight; e) optionally, adding further additives selected from colorants, UV markers, condensation catalysts, or stabilizers; f) waiting, optionally under stirring, shaking, and/or heating, until all hydrolyzable groups present in all added organosilane OS, organoitianate OT, and organozirconate OZ are hydrolyzed. The process yields a highly storage-stable adhesion-promoting pre-treatment composition that is useful for automotive glass replacement operations regardless of the ambient climate and enables long-lasting adhesive bonds with improved water stability.

Dependencies are inferred from the claim text.