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:
Jan. 25, 1983
Filed:
Feb. 19, 1982
Karlheinz Messmer, Ludwigshafen, DE;
Hermann Fischer, Limburgerhof, DE;
Heinrich Hartmann, Limburgerhof, DE;
Walter Denzinger, Speyer, DE;
Rolf Schneider, Mannheim, DE;
Klaus Wulz, Lambsheim, DE;
Hans-Juergen Raubenheimer, Ketsch, DE;
BASF Aktiengesellschaft, Rheinland-Pfalz, DE;
Abstract
Maleic anhydride copolymer powders are prepared by a process wherein a solution or dispersion of maleic anhydride in an alkyl vinyl ether and/or an alkene, containing from 3 to 25 moles of the alkyl vinyl ether and/or alkene per mole of maleic anhydride, is brought into contact with a powder bed under polymerization conditions, and is polymerized in the bed while the reaction mass is circulated and the powder state is maintained, and the heat generated during polymerization is removed by evaporating excess monomer which boils lower than maleic anhydride.