| 摘要 |
A process is disclosed, for the preparation of a hydrazine-free N-vinyl-2-pyrrolidone polymer which dissolves in water and organic solvents to give a clear solution and contains not less than 50% by weight of N-vinyl-2-pyrro-lidone as copolymerized units. According to this process, from 0.1 to 3% by weight, based on monomer, of di-tert-butyl peroxide, if necessary diluted up to 100 times in solution or emulsion, are added to a 10 to 80% strength by weight aqueous monomer solution, and the stirred mixture is kept for from 1 to 15 hours at from 100 to 160.degree.C, the desired molecular weight being set in the Fikentscher K value range of from 10 to 100 by adding from 0 to 100% by weight, based on monomer, of a regulator. |
