| 摘要 |
Urea derivatives of formula 1 for the hardening of hydroxyl group-containing polymers. wherein each of R1-R7 is a hydrogen atom or a linear or branched C1-C4-alkyl group, preferably methyl, ethyl, n-propyl, isopropyl, n-butyl or isobutyl, R1-R7 being identical or different, and R8 is a linear or branched C1-C6-alkyl group, preferably methyl, ethyl, n-propyl, isopropyl, n-butyl or isobutyl. The compounds 1 are prepared by reacting a compound 2 wherein R9 is a member selected from the group consisting of -CHO, -CH(OH) -OR8 and -CH(OH)2 with a urea derivative 3 optionally followed by etherification of the reaction product with an alcohol X-OH, wherein X is a linear or branched C1-C4-alkyl group.
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