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:
Apr. 24, 1979
Filed:
Jan. 13, 1978
Gunter Sackmann, Leverkusen, DE;
Gunter Kolb, Leverkusen, DE;
Heinz Fischer, Pulheim, DE;
Friedhelm Muller, Odenthal, DE;
Bayer Aktiengesellschaft, , DE;
Abstract
An improved process for the production of a substantially equimolecular copolymer of maleic acid anhydride and diisobutylene in which from 10 to 100 mole % of the anhydride groups are esterified with linear or branched aliphatic monoalcohols containing from 1 to 20 carbon atoms or with cycloaliphatic monoalcohols containing from 5 to 6 carbon atoms to form the corresponding semiesters, wherein shortly before or after the end of the solution or suspension copolymerization of maleic acid anhydride and diisobutylene a monomer corresponding to the general formula ##STR1## in which R=H, CH.sub.3, C.sub.2 H.sub.5, --OR.sub.2, --O--CO--CH.sub.3, ##STR2## --CH.sub.2 OH, --CH.sub.2 O--C--CH.sub.3, R.sub.1 =H , CH.sub.3 and