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:
Mar. 21, 1989
Filed:
Jan. 29, 1987
Applicant:
Inventors:
Michael Kroener, Mannheim, DE;
Willi Schmidt, Ludwigshafen, DE;
Alfred Oftring, Ludwigshafen, DE;
Theo Proll, Bad Duerkheim, DE;
Heinrich Hartmann, Limburgerhof, DE;
Assignee:
Basf Aktiengesellschaft, Rheinland-Pfalz, DE;
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ; C07C / ;
U.S. Cl.
CPC ...
564216 ; 564123 ; 564197 ;
Abstract
N-Vinylformamide is purified by fractional distillation in the presence of formamide in a column under from 0.5 to 30 mbar by a method in which the distillation is controlled so that N-vinylformamide containing from 0.1 to 15% by weight of formamide is obtained as the distillate. Homopolymers having particularly high molecular weights can be prepared from the N-vinylformamide purified in this manner.