Air-drying polyurethane resins, their preparation and use
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United States of America Patent
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Dec 31, 1996
Issued Date -
N/A
app pub date -
May 30, 1995
filing date -
Feb 15, 1990
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Abstract
An aqueous coating composition containing at least one water-dispersible polyurethane resin containing air-drying groups and optionally further binder resins and conventional paint additives, which polyurethane resin contains structural units derived from (A) polyisocyanates, (B) polyols containing air-drying groups, (C) optionally polyols which are free of air-drying groups, (D) compounds having at least two groups which are reactive with isocyanate groups and at least one group capable of anion formation, (E) optionally monoalcohls containing air-drying groups, (F) and/or compounds which differ from (B), (C), (D) and (E) and contain at least one group which is reactive with NCO groups, which has excellent pigment compatibility and the coatings produced therefrom have good corrosion protection and good mechanical properties even in the absence of siccatives.
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