Emulsions and their use in the production of foams based on isocyanates

An emulsion comprising

• (I) an isocyanate-reactive composition A, comprising a polyol mixture A1 comprising at least three polyols A1a, A1b and A1e as the continuous phase
• and
• (II) at least one physical blowing agent T as the disperse phase,
• wherein:
• A1a is a polyether polyol having a hydroxyl value from 15 mg KOH/g to 550 mg KOH/g and a functionality from 1.5 to 6,0, obtained by the addition of an epoxy to one or more starter compound(s) selected from the group consisting of carbohydrates and difunctional or higher-functional alcohols;
• (ii) A1b is a polyether polyol having a hydroxyl value from 100 mg KOH/g to 550 mg KOH/g and a functionality from 1.5 to 5.0, obtained by the addition of an epoxy to an aromatic amine;
• (iii) A1e is a polyester polyether polyol having a hydroxyl value from 100 mg KOH/g to 450 mg KOH/g and a functionality from 1.5 to 3.5, obtained by the addition of an epoxy to the esterification product of an aromatic dicarboxylic acid derivative and a difunctional or higher-functional alcohol