C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/66 (2006.01) C08G 18/12 (2006.01) C08G 18/32 (2006.01) C08G 18/42 (2006.01) C08G 18/72 (2006.01) C09D 175/06 (2006.01)
Patent
CA 2363642
The present invention relates to aqueous polyurethane dispersions wherein the polyurethanes are reaction products of A) at least difunctional polyols having a molecular weight of 500 to 6000, B) at least difunctional low molecular weight alcohols, C) di- and/or trifunctional isocyanates and D) compounds with an acid group and one or two hydroxy- and/or primary or secondary amino groups in an amount sufficient to provide an acid number, based on resin solids, of < 25 mg KOH/g of substance, wherein i) the neutralizing agent is added in an amount sufficient to neutralize 40 to 105% of the acid groups and an amount sufficient to neutralize at least 60% of the acid groups is added prior to the chain extension reaction, ii) at least 1 wt. % of components A) and B), based on the total weight of components A) to D), are tri- or higher-functional compounds and iii) the polyurethane contains 1 to 4 wt. % of the urea groups formed by the reaction of water and isocyanate groups. The present invention also relates to a process for preparing these polyurethane dispersions and to coating compositions containing these polyurethane dispersions.
L'invention concerne de nouvelles dispersions de polyuréthanne, leur procédé de production et leur utilisation dans des liants aqueux destinés à des revêtements à séchage rapide utilisés pour la peinture des automobiles.
Blum Harald
Meixner Jurgen
Muller Heino
Petzoldt Joachim
Aktiengesellschaft Bayer
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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