The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 13, 2001
Filed:
Jun. 25, 1998
Applicant:
Inventors:
Stephan Kothrade, Limburgerhof, DE;
Rainer Blankenburg, Stuttgart-Feuerbach, DE;
Iris Peters, Lambsheim, DE;
Axel Sanner, Frankenthal, DE;
Assignee:
BASF Aktiengesellschaft, Ludwigshafen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F 2/38 ;
U.S. Cl.
CPC ...
C08F 2/38 ;
Abstract
A process for preparing highly concentrated aqueous solutions of low molecular mass homopolymers of N-vinylpyrrolidone by free-radical solution polymerization in an aqueous medium with H,O,as initiator comprises carrying out the polymerization in the presence of from 0.1 to 30% by weight, based on N-vinylpyrrolidone, of a polymerization regulator which is selected from the group consisting of C,-C,-alkanols, hydroxylamine salts and water-soluble compounds containing sulfur in bonded form.