| 摘要 |
Polyisocyanates which contain uretdione groups and comprise A) from 55 to 87% by weight of uretdione, B) from 10 to 30% by weight of blocking agent, C) from 3 to 30% by weight of polyol having more than two hydroxyl groups and/or chain extender having more than two hydroxyl groups, the polyisocyanates containing more than two terminal, partially or fully blocked isocyanate groups and having molecular weight of from 1000 to 10,000.
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