Method for producing vinyl lactam copolymer for cosmetics, involves free-radical polymerizing water-soluble N-vinyl lactam(s) and hydrophobic comonomer(s), in organic solvent, in presence of initiator, at preset conditions

摘要

Free-radical polymerization of at least one of water-soluble N-vinyl lactam and at least one of hydrophobic comonomer, is carried out in an organic solvent, in presence of initiator under reflux conditions, such that at least 10 mol% of N-vinyl lactam is added to polymerization mixture after at least 90 mol% of hydrophobic monomer is completely reacted. Thus, a vinyl lactam copolymer is produced.