| 摘要 |
The invention concerns aqueous preparations of water-dilutable blocked polyisocyanates, their production and use in optionally self-crosslinking one-component systems. The blocked polyisocyanates have a structure according to formula (I) where A denotes a radical of a polyisocyanate, B denotes a radical of a cationic, anionic and/or non-ionic hydrophilising agent, X denotes oxygen, NH or NR, R denotes hydrogen, C1 to C8 alkyl or cycloalkyl, Z stands for the number 1 to 8, and Y denotes a number from 0.1 to 4.0, the equivalent ratio of z to y being from 20:1 to 1:1.
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