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US 2003/0171488 A1Published application
Dimethylpyrazole-blocked isocyanate mixtures
AssigneeBayer Aktiengesellschaft
InventorsEberhard König, Reinhard Halpaap, Thomas Klimmasch, Hans-Ulrich Meier-Westhues, Harald Mertes, Joachim Schüll, Bernd Steinhilber
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Abstract
The invention relates to particular mixtures of polyisocyanates which are blocked with 3,5-dimethylpyrazole, and to the use thereof as crosslinking component in single-component stoving lacquers, especially automotive clear lacquers.
Claims3
Mixtures of blocked polyisocyanates containing
- a) blocked polyisocyanates based on 1,6-diisocyanatohexane (HDI),
- b) blocked polyisocyanates based on cycloaliphatic diisocyanates, and
- c) 3,5-dimethylpyrazole as the sole blocking agent for the polyisocyanates mentioned under a) and b), characterised in that the blocked polyisocyanates are present in relative proportions of a):b)=1:1.8 to 2.2.
Dependencies are inferred from the claim text.