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US 6,713,556 B2Granted
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
A mixture of blocked polyisocyanates comprising
- a) a blocked polyisocyanate prepared from 1,6-diisocyanatohexane (HDI) and blocked with 3,5-dimethylpyrazole and
- b) a blocked polyisocyanate prepared from a cycloaliphatic diisocyanate and blocked with 3,5-dimethylpyrazole,
- wherein blocked polyisocyanates a) and b) are present in a weight ratio, based on resin solids, of 1:1.8 to 1:2.2.
Dependencies are inferred from the claim text.