Patent ID: 6103820
Filing Date: 2000-08-15
Classification: A61K,A61Q,C08F

Abstract:
A process for preparing copolymers in a reaction vessel, which can be dissolved in water to give clear solutions, of at least one water-soluble N-vinyllactam of the formula I, ##STR3## in which n is 1 or 2, and at least one hydrophobic comonomer having a water-solubility of from 1 to 100 g/l at 20.degree. C. by free radical polymerization in water which may contain up to 5% by weight of C.sub.1 -C.sub.4 -alcohol in the presence of an initiator, wherein the initiator used is selected from the group consisting of azo initiators, H.sub.2 O.sub.2, hydroperoxides in combination with reducing agents and per-salts, and is added to the reaction vessel in the form of a solution in water and/or in a C.sub.1 -C.sub.4 -alcohol and wherein from 14 to 30% by weight of the N-vinyllactam is introduced to the reaction vessel as an initial charge and the remainder of the monomers, undiluted or diluted with water and/or a C.sub.1 -C.sub.4 -alcohol is metered in to the reaction vessel.