Polyurethane-polyurea dispersions
AssigneeBayer Aktiengesellschaft
InventorsThorsten Rische, Karin Naujoks, Thomas Feller, Christoph Gürtler, Jan Mazanek
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Abstract
The invention relates to polyurethane-polyurea dispersions, also called PU dispersion, which contain aralkylamine-blocked isocyanate groups, and to their preparation and use. This blocking agent ahs a significantly lower deblocking temperature as compared with the prior art. Coatings produced from this dispersion have high hydrolysis resistances. The arylamine-blocked isocyanate groups are composed of polyisocyanates, polymeric polyols having average molar weights of 400 to 6000, at least one blocking agent, and either or both of nonionically hydrophilicizing compounds or compounds having at least one ionic or potentially ionic group.
Claims15
Post-crosslinkable polyurethane-polyurea dispersions composed of:
- A1) polyisocyanates,
- A2) polymeric polyols having average molar weights of 400 to 6 000,
- A3) optionally mono- or polyalcohols or mono- or polyamines having average molar weights of up to 400,
- A4) at least one blocking agent, of which at least 20% by weight is composed of aralkylamines,
- and at least one compound selected from
- A5) compounds which have at least one ionic or potentially ionic group and
- A6) nonionically hydrophilicizing compounds.
Dependencies are inferred from the claim text.