Process for the preparation of water-soluble copolymers of at least one water-soluble N-vinyl lactam and at least one hydrophobic comonomer

摘要

Preparation of clear water soluble copolymers (II) containing at least one water soluble N-vinyllactam of formula (I) and a hydrophobic co-monomer with a water solubility of 1-100g/l at 20 degrees C comprises radical polymerisation in aqueous solution in the presence of an initiator. The initiator is an azoinitiator, H2O2, hydroperoxides in combination with reducing agents and persalts and which are added to the reaction mixture in aqueous or 1-4C alcohol solution. n = 1 or 2. Also claimed are (II) containing at least one water soluble (I) and a hydrophobic co-monomer with a water solubility of 1-100g/l at 20 degrees C and a K value of at least 50.