| 摘要 |
Production of polymers of N-vinyl-caprolactam (NVC) comprises polymerisation of (A) 40-100 wt.% NVC and (B) 0-60 wt.% other unsaturated comonomer in a solvent at 100-200 degrees C with the aid of a peroxide with a decomposition half- life of at least 10 hours at 95 degrees C. Also claimed are polymers with a K value of 8-30 obtained by this process. Suitable peroxides are dialkyl, diaryl or aryl alkyl peroxides, monoalkyl hydroperoxides, dialkyl- diperoxo-alkanes or per-esters, preferably with 1-8C alkyl, aryl or aryl-alkyl groups. The process is carried out at 110-160 degrees C in a highly regulating solvent with easily transferably hydrogen atoms, preferably an alcohol or ether-alcohol, especially isopropanol, methanol or ethylene glycol. Preferred comonomers are N-vinyl-heterocycles or acrylamide. |
