Water-dilutable concentrates for the coating of various substrates

A process for the preparation of sol-based water-dilutable concentrates by mixing the following components:

• (A) from 0.5 to 25% by weight of an organosol obtainable by the hydrolysis and condensation of one or more trialkoxysilanes and/or dialkoxysilanes of general formula I
• R4-xSi(OR′)x (I)
• wherein
• R represents the same or different optionally substituted hydrocarbon groups with from 1 to 22 carbon atoms which are bonded to the silicon atom through a carbon atom, optionally interrupted by oxygen, sulfur, nitrogen or the group NR″, with R″ being hydrogen or C1 to C14 alkyl;
• the radicals R′ are the same or different and each represent an optionally substituted hydrocarbon group with from 1 to 8 carbon atoms, optionally interrupted by oxygen, sulfur, nitrogen or the group NR″ with the meaning mentioned above;
• and
• x is 2 or 3;
• (B) from 4 to 55% by weight of one or more alkoxides of general formula II
• Me(OR′)n (II)
• wherein
• Me represents Ti, Zr, Hf or Al, n is the valence of the metal cation, and R′ has the meaning mentioned above;
• (C) from 0.1 to 15% by weight of one or more complexing agents for reducing the hydrolysis rate of components (A) and (B);
• and
• (D) from 5 to 95% by weight of a water-compatible or water-miscible solvent having a boiling point of at least 150° C.;
• respectively based on 100% by weight of components (A), (B), (C) and (D), followed by removing alcohols having a boiling point of up to 150° C. are removed by distillation to adjust the flash point, and water is optionally added.