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:
Jun. 28, 1988
Filed:
Feb. 24, 1987
Edgar Leitz, Dormagen, DE;
Christian Lindner, Cologne, DE;
Herbert Eichenauer, Dormagen, DE;
Karl-Heinz Ott, Leverkusen, DE;
Hans-Josef Buysch, Krefeld, DE;
Peter Mues, Duisburg, DE;
Hartwig Hocker, Eckersdorf, DE;
Helmut Keul, Karlsruhe, DE;
Bayer Aktiengesellschaft, Leverkusen, DE;
Abstract
Process for the polymerization of cyclic aliphatic carbonates in the presence of aprotic organic solvents with exclusion of atmospheric oxygen and atmospheric moisture, wherein organometallic compounds of elements of main group 1 of the periodic table are used as initiators, the monomer/solvent ratio is in the range from 1 part by weight to 50 parts by weight of monomer per 100 parts by weight of solvent and the polymerization temperature is between -100.degree. C. and +20.degree. C.