Process for the production of aqueous polyurethane dispersions

Details Process for the production of aqueous polyurethane dispersions Process for the production of aqueous polyurethane dispersions

C - Chemistry, Metallurgy

08

J

400/7412

C08J 3/03 (2006.01) C08G 18/08 (2006.01) C08G 18/83 (2006.01)

Patent

CA 2019866

Mo3419 LeA 27,009 A PROCESS FOR THE PRODUCTION OF AQUEOUS POLYURETHANE DISPERSIONS ABSTRACT The present invention relates to a process for the production of aqueous dispersions of polyurethanes containing chemically incorporated carboxylate groups wherein the counterions to the carboxylate groups are predominantly ammonium ions corresponding to the formula ?H4 (II) by mixing a starting aqueous dispersion of polyurethanes containing chemically incorporated carboxylate groups wherein the counterions to the carboxylate groups are ammonium ions corresponding to the formula Image (III) wherein R1, R2 and R3 are the same or different and represent C1-4 alkyl groups, provided that the total number of carbon atoms in these substituents is 3 to 6, with at least an equivalent quantity of ammonia, based on the trialkyl ammonium ions, and subsequently removing under vacuum at least a portion of the displaced trialkyl amines and the excess ammonia, if present. Mo3419

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