Water-based composition of amino-functional silicon compounds

A process for the preparation of a composition which comprises a mixture of water-soluble, amino-functional silicon compounds which are essentially free from alkoxy groups, water, optionally a content of alcohol and optionally a content of acid, which comprises

• mixing at least one amino silane represented by formula (III):
• NH2[(CH2)2NH]x(CH2)3Si(OR)3 (III)
• wherein x is 0, 1 or 2, and R is a linear or branched alkyl group having 1 to 4 C atoms
• and/or condensation products thereof,
• and at least one amino silane represented by formula IV:
• (RO)3Si(CH2)3[NH(CH2)2]yNH[(CH2)2NH]x(CH2)3Si(OR)3 (IV)
• wherein y and z are each independently 0, 1 or 2, and R is a linear or branched alkyl group having 1 to 4 C atoms,
• and/or condensation products thereof,
• adding water and, optionally, acid, carrying out hydrolysis, and removing essentially all of the alcohol produced during the hydrolysis.