Patent ID: 6552119
Filing Date: 2003-04-22
Classification: C08G,C08L

Abstract:
A latent-crosslinking aqueous polyurethane dispersion comprising:I) a disperse phase (P.I) comprising Ia) a polyurethane (Ia) which has hydrophilic groups which make it dispersible in water and also has carbodiimide groups but essentially no carboxyl groups; or Ib) a physical mixture of Ibi) a polyurethane (Ibi) which has hydrophilic groups which make it dispersible in water but has essentially no carbodiimide or carboxyl groups, and Ibii) a carbodiimide (Ibii) which has essentially no hydrophilic groups which make it dispersible in water; and II) a coherent aqueous phase (P.II) comprising a dissolved form of a polycarboxylic acid II which has no carbodiimide groups but has a solubility of at least 1 g/l at 25Â° C. in said coherent aqueous phase P.II, wherein said polyurethane (Ia) and said polyurethane (Ibi) comprise diisocyanates and diols,wherein said diols contain no sulfonate groups andi) from 10 to 100 mol % of said diols, based on the overall amount of diols, have a molecular weight from 500 to 5000 g/mol, and ii) from 0 to 90 mol % of said diols, based on the overall amount of diols, have a molecular weight from 60 to 500 g/mol.