| 摘要 |
The present invention relates to radiationcurable oligomers which can be prepared from polyethertriols or -triamines a, polyetherdiols or -diamines b, OH-functional acrylate monomers c and diisocyanates d, the molar ratio of a to b being between 0.1 to ¢sic! 1.1, the molar ratio of c to a being between 2.0 and 10 and the ratio of equivalents of the NCO groups of d to the hydroxyl and/or amino groups in the sum of a to c being between 0.9 and 1.0, characterized in that the oligomers have been prepared by employing at least one compound having 3 to 4 amino groups and having a number-average molecular weight of more than 4000 to 10,000 and/or at least one compound having 2 amino groups and having a number-average molecular weight of more than 4000 to 10,000, and in that the oligomers have double bond contents of from 0.25 to 0.44 mol/kg.
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