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A condensation-inhibiting transparent cover layer of soft elastic polyurethane for viewing windows or other transparent glass or plastic substrates. The reaction mixture for production of the cover layer contains, in addition to a trifunctional polyisocyanate and a trifunctional polyol, a difunction

A condensation-inhibiting transparent cover layer of soft elastic polyurethane for viewing windows or other transparent glass or plastic substrates. The reaction mixture for production of the cover layer contains, in addition to a trifunctional polyisocyanate and a trifunctional polyol, a difunctional sulfonated polyether polyol, i.e. one containing sulfonate groups, and a non-ionic tenside in the form of an ethoxylated fatty alcohol and/or an ethoxylated fatty amine.

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A transparent cover layer for viewing windows or other transparent glass or plastic substrates, with a condensation-inhibiting effect made of soft elastic polyurethane made by polymerization of a reaction mixture comprising the following components: (a) a trifunctional aliphatic polyisocyanate of 1,

A transparent cover layer for viewing windows or other transparent glass or plastic substrates, with a condensation-inhibiting effect made of soft elastic polyurethane made by polymerization of a reaction mixture comprising the following components: (a) a trifunctional aliphatic polyisocyanate of 1,6-hexamethylene diisocyanate with a biuret or isocyanurate structure with a content of NCO groups of 12.6 to 28% by weight, corresponding to an average molecular weight of approximately 1000 to approximately 450 g/mol; (b) a trifunctional polyol selected from the group consisting of (A) a composition of trimethylolpropane and propylene oxide with a content of OH groups of 5.1 to 12.8% by weight, corresponding to an average molecular weight of approximately 1000 to approximately 400 g/mol, (B) a trifunctional polycaprolactone with a content of OH groups of 5.1 to 17% by weight, corresponding to an average molecular weight of 1000 to 300 g/mol and mixtures of A and B; (c) a difunctional sulfonated polyoxyalkylene ether, of 1,2- or 1,3-diolene with a content of OH groups of 0.5 to 13.2% by weight, corresponding to an average molecular weight of approximately 6500 to 250 g/mol, with the formula R－CH2O－(C2H4O－)n－(C3H6O－)m－CH2CH2CH2－SO3X where [Figure] X=H－, sodium or ammonium ion, n’0 to 1-00, m=0 to 30, (d) non-ionic copolymer of dimethyl polysiloxane (dimethyl siloxane/monoethyl polyether siloxane copolymer) modified with polyoxyalkylene in the side chain, with an average molecular weight of approximately 500-2000 g/mol, with the general formula [Figure] where the ratio x/y=5/1 to 1/1, a=80-100% by weight, and b=20-0% by weight, and (e) at least one non-ionic tenside selected from the group consisting of (A) an ethoxylated fatty alcohol, (B) an ethoxylated fatty amine and mixtures of A and B.