公开(公告)号：ES2024462B3

公开(公告)日：1992-03-01

申请号：ES87111649

申请日：1987-08-12

Applicant: BASF AG

Inventor： NUBER ADOLF ,  SANNER AXEL ,  STRAUB FERDINAND ,  VOGEL FRIEDRICH

IPC: A61K8/00 ,  A61K8/31 ,  A61K8/34 ,  A61K8/35 ,  A61K8/36 ,  A61K8/41 ,  A61K8/81 ,  A61Q5/06 ,  C08F8/44 ,  C08F26/10 ,  C08F220/04 ,  C08F220/06 ,  C08F220/10 ,  C08F220/12 ,  C08F220/18 ,  C08F226/10

公开(公告)号：CA1287946C

公开(公告)日：1991-08-20

申请号：CA544500

申请日：1987-08-13

Applicant: BASF AG

Inventor： NUBER ADOLF ,  SANNER AXEL ,  URBAN DIETER

IPC: B01D15/00 ,  C08F6/00 ,  C08F6/10 ,  C08F26/10

Abstract: Vinylpyrrolidone is removed from its polymers by a process in which an aqueous or alcoholic solution of the polymer is treated with an adsorbent, the adsorbents used preferably being active carbon, zeolites and especially acidic ion exchangers.

公开(公告)号：CA1273744A

公开(公告)日：1990-09-04

申请号：CA516900

申请日：1986-08-27

Applicant: BASF AG

Inventor： NUBER ADOLF ,  LANG SIEGFRIED ,  SANNER AXEL ,  SCHROEDER GERD

IPC: C08F4/00 ,  C08F4/28 ,  C08F4/34 ,  C08F26/00 ,  C08F26/10

Abstract: Polyvinylpyrrolidone having a Fikentscher K value of from 14 to 95 is prepared at from 50 to 95.degree.C in aqueous solution with hydrogen peroxide as starter, the solution being maintained at pH 7-11 by means of NaOH, KOH, their carbonates or bicarbonates.