US 11,697,747 B2
Method of preparation of aqueous polyurethane-polyurea dispersion and aqueous base paint containing said dispersion
Hardy Reuter, Muenster (DE); Matthias Blohm, Muenster (DE); Bernhard Steinmetz, Ruetschenhausen (DE); Peggy Jankowski, Guentersleben (DE); Dirk Eierhoff, Muenster (DE); and Thomas Zihang, Sendenhorst (DE)
Assigned to BASF COATINGS GMBH, Münster (DE)
Filed by BASF Coatings GmbH, Muenster (DE)
Filed on Sep. 18, 2020, as Appl. No. 17/25,139.
Application 17/025,139 is a division of application No. 15/534,048, granted, now 10,836,927, previously published as PCT/EP2015/076683, filed on Nov. 16, 2015.
Claims priority of application No. 14196881 (EP), filed on Dec. 9, 2014.
Prior Publication US 2021/0002509 A1, Jan. 7, 2021
Int. Cl. C09D 175/04 (2006.01); C08G 18/75 (2006.01); B05D 7/14 (2006.01); C08G 18/10 (2006.01); C09D 5/00 (2006.01); C08G 18/66 (2006.01); C08G 18/08 (2006.01); C08G 18/42 (2006.01); C08G 18/76 (2006.01); B05D 7/00 (2006.01); C08G 18/24 (2006.01); C08G 18/80 (2006.01)
CPC C09D 175/04 (2013.01) [B05D 7/14 (2013.01); B05D 7/572 (2013.01); C08G 18/0823 (2013.01); C08G 18/10 (2013.01); C08G 18/242 (2013.01); C08G 18/4233 (2013.01); C08G 18/6659 (2013.01); C08G 18/755 (2013.01); C08G 18/758 (2013.01); C08G 18/7642 (2013.01); C08G 18/80 (2013.01); C09D 5/002 (2013.01)] 15 Claims
 
1. A process for preparing an aqueous polyurethane-polyurea dispersion, said process comprising, in the following order:
dispersing, in an aqueous phase, a composition comprising, based in each case on the total amount of the composition 15 to 65 wt % of at least one intermediate comprising at least one isocyanate group and at least one blocked primary amino group, and 35 to 85 wt % of at least one organic solvent which has a solubility in water of not more than 38 wt % at a temperature of 20° C., thereby obtaining a dispersion wherein the polymer dispersion comprises molecules that are intramolecularly crosslinked between an amino group and an isocyanate group, and
at least partly removing the at least one organic solvent from the dispersion,
thereby obtaining an aqueous polyurethane-polyurea dispersion comprising polyurethane-polyurea particles having an average particle size of 40 to 2000 nm and a gel fraction of at least 50%,
wherein the at least one intermediate is prepared by a process comprising a reaction of
at least one polyurethane prepolymer comprising isocyanate groups and comprising anionic groups and/or groups which can be converted into anionic groups, with
at least one polyamine comprising at least two blocked primary amino groups and at least one free secondary amino group,
by addition reaction of isocyanate groups from the at least one polyurethane prepolymer with free secondary amino groups from the at least one polyamine.