| 摘要 |
The present invention relates to heat-curable, cyclic isocyanate addition products i) which are the reaction products of a) a polyisocyanate component having an average isocyanate functionality of two or more and a uretdione group content (calculated as N2C2O2, MW 84) of 1 to 30%, based on the weight of the polyisocyanate component, with b) a compound containing two or more isocyanate-reactive groups and ii) in which at least 10% by weight of the reaction products are in the form of cyclic groups containing urea and/or urethane groups. The present invention also relates to a process for the preparation of these cyclic isocyanate addition products and to the products obtained by curing these compositions, optionally in the presence of other isocyanate-reactive compounds, at elevated temperatures, e.g., coatings, adhesives, molded articles, elastomers and foams.
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