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US4191684A Urea derivatives, their preparation, and their use as light stabilizers 失效
尿素衍生物,它们的制备及其作为光稳定剂的用途

Urea derivatives, their preparation, and their use as light stabilizers
摘要:
The invention provides novel 4-carbamoyl derivatives of 1-oxa-3-oxo-4,8-diaza-spiro-[4,5]-decanes and their preparation from 1 oxa-3-oxo-4,8-diaza-spiro-[4,5]-decanes and isocyanates. The products are suitable light stabilizers for thermoplastics.
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