公开(公告)号：JPH1171414A

公开(公告)日：1999-03-16

申请号：JP17945598

申请日：1998-06-26

Applicant: BASF AG

Inventor： KOTHRADE STEPHAN DR ,  BLANKENBURG RAINER DR ,  PETERS IRIS ,  SANNER AXEL DR

IPC: C08F2/10 ,  C08F2/38 ,  C08F4/28 ,  C08F126/10

Abstract: PROBLEM TO BE SOLVED: To easily obtain a highly concentrated aqueous solution of a low- molecular-weight homopolymer of N-vinylpyrrolidone by polymerizing N- vinylpyrrolidone in the presence of a polymerization modifier being a specified water-soluble compound and a H2 O2 initiator in an aqueous solution. SOLUTION: N-vinylpyrrolidone is polymerized in the presence of 0.1-30 wt.%, based on the N-vinylpyrrolidone, polymerization modifier selected from among 1-6C alkanols, hydroxylamine salts and water-soluble compounds containing sulfur in a combined form. The initiator H2 O2 is used in an amount of about 0.1-10 wt.% based on the amount of the N-vinylpyrrolidone. The polymerization modifier containing sulfur in a combined form is advantageously a mercapto compound, a dialkyl sulfide, a dialkyl disulfide and/or a dialkyl sulfide. The hydroxylamine salt used as the polymerization modifier is exemplified by hydroxylammonium sulfate. The polymerization modifier which can be particularly advantageously used is a 1-6C alkanol, especially ethanol, n- or iso- propanol.

公开(公告)号：ES2205333T3

公开(公告)日：2004-05-01

申请号：ES98111870

申请日：1998-06-26

Applicant: BASF AG

Inventor： KOTHRADE STEPHAN ,  BLANKENBURG RAINER ,  PETERS IRIS ,  SANNER AXEL

IPC: C08F2/10 ,  C08F2/38 ,  C08F4/28 ,  C08F126/10

Abstract: Production of highly concentrated aqueous solutions of low molecular homopolymers (I) of N-vinylpyrrolidone (NVP) by free radical solution polymerisation in an aqueous medium with hydrogen peroxide (H2O2) as initiator; polymerisation being carried out in the presence of 0.1-30 wt.%, with respect to NVP, of a polymerisation regulator selected from 1-6 carbon (C) alkanols, hydroxylamine salts and water-soluble sulphur compounds.

公开(公告)号：DE59809260D1

公开(公告)日：2003-09-18

申请号：DE59809260

申请日：1998-06-26

Applicant: BASF AG

Inventor： KOTHRADE STEPHAN ,  BLANKENBURG RAINER ,  PETERS IRIS ,  SANNER AXEL

IPC: C08F2/10 ,  C08F2/38 ,  C08F4/28 ,  C08F126/10

Abstract: Production of highly concentrated aqueous solutions of low molecular homopolymers (I) of N-vinylpyrrolidone (NVP) by free radical solution polymerisation in an aqueous medium with hydrogen peroxide (H2O2) as initiator; polymerisation being carried out in the presence of 0.1-30 wt.%, with respect to NVP, of a polymerisation regulator selected from 1-6 carbon (C) alkanols, hydroxylamine salts and water-soluble sulphur compounds.

公开(公告)号：DE19727476A1

公开(公告)日：1999-01-07

申请号：DE19727476

申请日：1997-06-27

Applicant: BASF AG

Inventor： KOTHRADE STEPHAN DR ,  BLANKENBURG RAINER DR ,  PETERS IRIS ,  SANNER AXEL DR

IPC: C08F2/10 ,  C08F2/38 ,  C08F4/28 ,  C08F126/10

Abstract: Production of highly concentrated aqueous solutions of low molecular homopolymers (I) of N-vinylpyrrolidone (NVP) by free radical solution polymerisation in an aqueous medium with hydrogen peroxide (H2O2) as initiator; polymerisation being carried out in the presence of 0.1-30 wt.%, with respect to NVP, of a polymerisation regulator selected from 1-6 carbon (C) alkanols, hydroxylamine salts and water-soluble sulphur compounds.