Process for producing cellular plastics by the polyisocyanate polyaddition method by means of stable emulsions containing blowing agents, and such emulsions

Stable blowing agent emulsions containing

• (i) at least one low boiling partially or completely fluorinated aliphatic and/or cycloaliphatic hydrocarbon that has 3 to 8 carbons and is insoluble or almost insoluble in organic and/or modified organic polyisocyanates (a) or at least one high molecular compound with at least two reactive hydrogens (b) and/or sulfur hexafluoride as blowing agent (d)
• (ii) at least one organic and/or modified organic polyisocyanate (a) or at least one higher molecular compound with at least two reactive hydrogens (b) or mixtures of (b) and low molecular chain extenders and/or crosslinking agents (c) and
• (iii) at least one oligomeric acrylate containing polyoxyalkylene and fluoroalkane side groups as emulsifier.

Stable blowing agent emulsions consisting of

• (i) 1 to 150 parts by weight per 100 parts by weight of organic and/or modified organic polyisocyanates (a) or at least one high molecular compound with at least two reactive hydrogens (b) of at least one low boiling partially or completely fluorinated aliphatic and/or cycloaliphatic hydrocarbon that has 3 to 8 carbons and is insoluble or almost insoluble in (a) or (b) and/or sulfur hexafluoride as blowing agent (d),
• (ii) at least one organic and/or modified organic polyisocyanate (a) or at least one higher molecular compound with at least two reactive hydrogens (b) or a mixture of (b) and low molecular chain extenders and/or crosslinking agents (c), and
• (iii) 0.01 to 6.0 parts by weight per 100 parts by weight of (a) or (b) of at least one oligomeric acrylate that contains polyoxyalkylene and fluoroalkane side groups as emulsifier.