Method for producing aqueous polyurethane dispersions by means of flash evaporation
AssigneeDegussa AG
InventorsMatthias Orschel, Wolfgang Sasse
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Abstract
The invention relates to a novel process for preparing aqueous polyurethane dispersions from solvent-containing, aqueous polyurethane dispersions or solutions by means of flash evaporation of the organic solvents or organic solvent mixtures, and also to a process for preparing aqueous polyurethane dispersions by converting hydrophilically modified NCO prepolymers or polyurethanes in an optionally aqueous, organic solvent or solvent mixture to an aqueous dispersion or aqueous solution and subsequently removing the organic solvent or solvent mixture.
Claims16
A process for preparing solvent-free or low-solvent aqueous polyurethane dispersions from solvent-containing, aqueous polyurethane dispersions or solutions,
- which comprises
- removing the organic solvents or the organic solvent mixtures from the solvent-containing, aqueous polyurethane dispersions or solutions by means of flash evaporation.
A process for removing organic solvents or organic solvent mixtures from solvent-containing, aqueous polyurethane dispersions or polyurethane solutions by means of flash evaporation.
A process for preparing aqueous polyurethane dispersions by converting hydrophilically modified NCO prepolymers and polyurethanes in an optionally aqueous, organic solvent or solvent mixture to a solvent-containing, aqueous dispersion or solution and subsequently removing the organic solvent or solvent mixture by means of flash evaporation.
Dependencies are inferred from the claim text.