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Abstract

Blowing agent-containing emulsions comprise a) compounds containing hydrogen atoms which are reactive toward isocyanates, b) blowing agents, c) catalysts, auxiliaries and/or additives which are customary in polyurethane chemistry, wherein the blowing agents b) are present as an emulsion in the components a) and c), and polyester alcohols having the following structure are used as emulsification aids: ##STR1## where m=0-15 n=0-1 o=0-15 p=0-1 q=0-15 r=0-1 s=0-15 t=0-1 u=0-10 v=0-15 x=1-5 y=1-4 or mixtures of 1-3 where r+n.noteq.0 z=0-3 z.sub.i =0.1-3 R.sub.1 is an aliphatic structure without OH groups, based on the structure of polyhydric alcohols, preferably ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol and dipropylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, 1,3-butanediol, trimethylolpropane, trimethylol ethane, glycerol, pentaerythritol, where these substances can also be used as any mixture with one another in the esterification and R.sub.1 can therefore also be a mixture of the corresponding structures, R.sub.2 is the radical of a polycarboxylic acid without COOH groups, eg. adipic acid, terephthalic acid, o-phthalic acid, R.sub.3 is an alcohol radical like R.sub.1.

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