Process for preparing aqueous polyurethane dispersions by...

C - Chemistry – Metallurgy – 08 – G

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C08G 18/08 (2006.01) C08J 3/07 (2006.01)

Patent

CA 2571711

The invention relates to a novel method for producing aqueous polyurethane dispersions from aqueous polyurethane dispersions or solutions containing solvents, by means of flash evaporation of the organic solvent or organic solvent mixtures. The invention also relates to a method for producing aqueous polyurethane dispersions by transforming hydrophilically modified NCO prepolymers or polyurethanes in an optionally aqueous organic solvent or solvent mixture into an aqueous dispersion or aqueous solution, and then removing the same from the organic solvent or solvent mixture.

La présente invention concerne un nouveau procédé pour produire des dispersions de polyuréthanne aqueuses à partir de dispersions ou de solutions de polyuréthanne aqueuses contenant des solvants, au moyen d'une vaporisation éclair des solvants organiques ou des mélanges de solvants organiques, ainsi qu'un procédé pour produire des dispersions de polyuréthanne aqueuses en transformant des prépolymères NCO à modification hydrophile ou des polyuréthannes dans un solvant organique ou dans un mélange de solvants organiques contenant éventuellement de l'eau en une dispersion aqueuse ou en une solution aqueuse, puis en éliminant le solvant organique ou le mélange de solvants organiques.

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