Patent ID: 6599975
Filing Date: 2003-07-29
Classification: C08G,C08L,C09D,C09J,C14C,D06M,D06N,E04D,Y10T

Abstract:
A latent-crosslinking aqueous polyurethane dispersion comprisingI) a disperse phase (P.I) comprising Ia) a polyurethane (Ia) which carries carbodiimide groups in addition to the hydrophilic groups which make it dispersible in water but carries essentially no carboxyl groups, which polyurethane is composed of diisocyanates, which comprise carbodiimide structural units, diols of which from 10 to 100 mol %, based on the overall amount of the diols, have a molecular weight of from 500 to 5000 g/mol, and from 0 to 90 mol %, based on the overall amount of the diols, have a molecular weight of from 60 to 500 g/mol orIb) a physical mixture of Ibi) a polyurethane (Ibi) which carries hydrophilic groups which make it dispersible in water but carries essentially no carbodiimide or carboxyl groups and Ibii) a carbodiimide (Ibii) which carries essentially no hydrophilic groups which make is dispersible in water, and II) a disperse phase (P.II) comprising another polymer (II) which carries carboxyl groups and essentially no carbodiimide groups.